zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/ext4/super.c b/ap/os/linux/linux-3.4.x/fs/ext4/super.c
new file mode 100644
index 0000000..2e26a54
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/ext4/super.c
@@ -0,0 +1,5081 @@
+/*
+ * linux/fs/ext4/super.c
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ * from
+ *
+ * linux/fs/minix/inode.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * Big-endian to little-endian byte-swapping/bitmaps by
+ * David S. Miller (davem@caip.rutgers.edu), 1995
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/time.h>
+#include <linux/vmalloc.h>
+#include <linux/jbd2.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/parser.h>
+#include <linux/buffer_head.h>
+#include <linux/exportfs.h>
+#include <linux/vfs.h>
+#include <linux/random.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/quotaops.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+#include <linux/ctype.h>
+#include <linux/log2.h>
+#include <linux/crc16.h>
+#include <linux/cleancache.h>
+#include <asm/uaccess.h>
+
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+
+#include "ext4.h"
+#include "ext4_extents.h"
+#include "ext4_jbd2.h"
+#include "xattr.h"
+#include "acl.h"
+#include "mballoc.h"
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/ext4.h>
+
+static struct proc_dir_entry *ext4_proc_root;
+static struct kset *ext4_kset;
+static struct ext4_lazy_init *ext4_li_info;
+static struct mutex ext4_li_mtx;
+static struct ext4_features *ext4_feat;
+
+static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
+ unsigned long journal_devnum);
+static int ext4_show_options(struct seq_file *seq, struct dentry *root);
+static int ext4_commit_super(struct super_block *sb, int sync);
+static void ext4_mark_recovery_complete(struct super_block *sb,
+ struct ext4_super_block *es);
+static void ext4_clear_journal_err(struct super_block *sb,
+ struct ext4_super_block *es);
+static int ext4_sync_fs(struct super_block *sb, int wait);
+static const char *ext4_decode_error(struct super_block *sb, int errno,
+ char nbuf[16]);
+static int ext4_remount(struct super_block *sb, int *flags, char *data);
+static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
+static int ext4_unfreeze(struct super_block *sb);
+static void ext4_write_super(struct super_block *sb);
+static int ext4_freeze(struct super_block *sb);
+static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data);
+static inline int ext2_feature_set_ok(struct super_block *sb);
+static inline int ext3_feature_set_ok(struct super_block *sb);
+static int ext4_feature_set_ok(struct super_block *sb, int readonly);
+static void ext4_destroy_lazyinit_thread(void);
+static void ext4_unregister_li_request(struct super_block *sb);
+static void ext4_clear_request_list(void);
+
+#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
+static struct file_system_type ext2_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "ext2",
+ .mount = ext4_mount,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
+#else
+#define IS_EXT2_SB(sb) (0)
+#endif
+
+
+#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
+static struct file_system_type ext3_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "ext3",
+ .mount = ext4_mount,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
+#else
+#define IS_EXT3_SB(sb) (0)
+#endif
+
+void *ext4_kvmalloc(size_t size, gfp_t flags)
+{
+ void *ret;
+
+ ret = kmalloc(size, flags);
+ if (!ret)
+ ret = __vmalloc(size, flags, PAGE_KERNEL);
+ return ret;
+}
+
+void *ext4_kvzalloc(size_t size, gfp_t flags)
+{
+ void *ret;
+
+ ret = kzalloc(size, flags);
+ if (!ret)
+ ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
+ return ret;
+}
+
+void ext4_kvfree(void *ptr)
+{
+ if (is_vmalloc_addr(ptr))
+ vfree(ptr);
+ else
+ kfree(ptr);
+
+}
+
+ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
+ struct ext4_group_desc *bg)
+{
+ return le32_to_cpu(bg->bg_block_bitmap_lo) |
+ (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
+ (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
+}
+
+ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
+ struct ext4_group_desc *bg)
+{
+ return le32_to_cpu(bg->bg_inode_bitmap_lo) |
+ (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
+ (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
+}
+
+ext4_fsblk_t ext4_inode_table(struct super_block *sb,
+ struct ext4_group_desc *bg)
+{
+ return le32_to_cpu(bg->bg_inode_table_lo) |
+ (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
+ (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
+}
+
+__u32 ext4_free_group_clusters(struct super_block *sb,
+ struct ext4_group_desc *bg)
+{
+ return le16_to_cpu(bg->bg_free_blocks_count_lo) |
+ (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
+ (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
+}
+
+__u32 ext4_free_inodes_count(struct super_block *sb,
+ struct ext4_group_desc *bg)
+{
+ return le16_to_cpu(bg->bg_free_inodes_count_lo) |
+ (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
+ (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
+}
+
+__u32 ext4_used_dirs_count(struct super_block *sb,
+ struct ext4_group_desc *bg)
+{
+ return le16_to_cpu(bg->bg_used_dirs_count_lo) |
+ (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
+ (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
+}
+
+__u32 ext4_itable_unused_count(struct super_block *sb,
+ struct ext4_group_desc *bg)
+{
+ return le16_to_cpu(bg->bg_itable_unused_lo) |
+ (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
+ (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
+}
+
+void ext4_block_bitmap_set(struct super_block *sb,
+ struct ext4_group_desc *bg, ext4_fsblk_t blk)
+{
+ bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
+ if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
+ bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
+}
+
+void ext4_inode_bitmap_set(struct super_block *sb,
+ struct ext4_group_desc *bg, ext4_fsblk_t blk)
+{
+ bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
+ if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
+ bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
+}
+
+void ext4_inode_table_set(struct super_block *sb,
+ struct ext4_group_desc *bg, ext4_fsblk_t blk)
+{
+ bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
+ if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
+ bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
+}
+
+void ext4_free_group_clusters_set(struct super_block *sb,
+ struct ext4_group_desc *bg, __u32 count)
+{
+ bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
+ if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
+ bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
+}
+
+void ext4_free_inodes_set(struct super_block *sb,
+ struct ext4_group_desc *bg, __u32 count)
+{
+ bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
+ if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
+ bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
+}
+
+void ext4_used_dirs_set(struct super_block *sb,
+ struct ext4_group_desc *bg, __u32 count)
+{
+ bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
+ if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
+ bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
+}
+
+void ext4_itable_unused_set(struct super_block *sb,
+ struct ext4_group_desc *bg, __u32 count)
+{
+ bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
+ if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
+ bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
+}
+
+
+/* Just increment the non-pointer handle value */
+static handle_t *ext4_get_nojournal(void)
+{
+ handle_t *handle = current->journal_info;
+ unsigned long ref_cnt = (unsigned long)handle;
+
+ BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
+
+ ref_cnt++;
+ handle = (handle_t *)ref_cnt;
+
+ current->journal_info = handle;
+ return handle;
+}
+
+
+/* Decrement the non-pointer handle value */
+static void ext4_put_nojournal(handle_t *handle)
+{
+ unsigned long ref_cnt = (unsigned long)handle;
+
+ BUG_ON(ref_cnt == 0);
+
+ ref_cnt--;
+ handle = (handle_t *)ref_cnt;
+
+ current->journal_info = handle;
+}
+
+/*
+ * Wrappers for jbd2_journal_start/end.
+ *
+ * The only special thing we need to do here is to make sure that all
+ * journal_end calls result in the superblock being marked dirty, so
+ * that sync() will call the filesystem's write_super callback if
+ * appropriate.
+ *
+ * To avoid j_barrier hold in userspace when a user calls freeze(),
+ * ext4 prevents a new handle from being started by s_frozen, which
+ * is in an upper layer.
+ */
+handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
+{
+ journal_t *journal;
+ handle_t *handle;
+
+ trace_ext4_journal_start(sb, nblocks, _RET_IP_);
+ if (sb->s_flags & MS_RDONLY)
+ return ERR_PTR(-EROFS);
+
+ journal = EXT4_SB(sb)->s_journal;
+ handle = ext4_journal_current_handle();
+
+ /*
+ * If a handle has been started, it should be allowed to
+ * finish, otherwise deadlock could happen between freeze
+ * and others(e.g. truncate) due to the restart of the
+ * journal handle if the filesystem is forzen and active
+ * handles are not stopped.
+ */
+ if (!handle)
+ vfs_check_frozen(sb, SB_FREEZE_TRANS);
+
+ if (!journal)
+ return ext4_get_nojournal();
+ /*
+ * Special case here: if the journal has aborted behind our
+ * backs (eg. EIO in the commit thread), then we still need to
+ * take the FS itself readonly cleanly.
+ */
+ if (is_journal_aborted(journal)) {
+ ext4_abort(sb, "Detected aborted journal");
+ return ERR_PTR(-EROFS);
+ }
+ return jbd2_journal_start(journal, nblocks);
+}
+
+/*
+ * The only special thing we need to do here is to make sure that all
+ * jbd2_journal_stop calls result in the superblock being marked dirty, so
+ * that sync() will call the filesystem's write_super callback if
+ * appropriate.
+ */
+int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
+{
+ struct super_block *sb;
+ int err;
+ int rc;
+
+ if (!ext4_handle_valid(handle)) {
+ ext4_put_nojournal(handle);
+ return 0;
+ }
+ sb = handle->h_transaction->t_journal->j_private;
+ err = handle->h_err;
+ rc = jbd2_journal_stop(handle);
+
+ if (!err)
+ err = rc;
+ if (err)
+ __ext4_std_error(sb, where, line, err);
+ return err;
+}
+
+void ext4_journal_abort_handle(const char *caller, unsigned int line,
+ const char *err_fn, struct buffer_head *bh,
+ handle_t *handle, int err)
+{
+ char nbuf[16];
+ const char *errstr = ext4_decode_error(NULL, err, nbuf);
+
+ BUG_ON(!ext4_handle_valid(handle));
+
+ if (bh)
+ BUFFER_TRACE(bh, "abort");
+
+ if (!handle->h_err)
+ handle->h_err = err;
+
+ if (is_handle_aborted(handle))
+ return;
+
+ printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
+ caller, line, errstr, err_fn);
+
+ jbd2_journal_abort_handle(handle);
+}
+
+static void __save_error_info(struct super_block *sb, const char *func,
+ unsigned int line)
+{
+ struct ext4_super_block *es = EXT4_SB(sb)->s_es;
+
+ EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
+ es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
+ es->s_last_error_time = cpu_to_le32(get_seconds());
+ strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
+ es->s_last_error_line = cpu_to_le32(line);
+ if (!es->s_first_error_time) {
+ es->s_first_error_time = es->s_last_error_time;
+ strncpy(es->s_first_error_func, func,
+ sizeof(es->s_first_error_func));
+ es->s_first_error_line = cpu_to_le32(line);
+ es->s_first_error_ino = es->s_last_error_ino;
+ es->s_first_error_block = es->s_last_error_block;
+ }
+ /*
+ * Start the daily error reporting function if it hasn't been
+ * started already
+ */
+ if (!es->s_error_count)
+ mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
+ es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
+}
+
+static void save_error_info(struct super_block *sb, const char *func,
+ unsigned int line)
+{
+ __save_error_info(sb, func, line);
+ ext4_commit_super(sb, 1);
+}
+
+/*
+ * The del_gendisk() function uninitializes the disk-specific data
+ * structures, including the bdi structure, without telling anyone
+ * else. Once this happens, any attempt to call mark_buffer_dirty()
+ * (for example, by ext4_commit_super), will cause a kernel OOPS.
+ * This is a kludge to prevent these oops until we can put in a proper
+ * hook in del_gendisk() to inform the VFS and file system layers.
+ */
+static int block_device_ejected(struct super_block *sb)
+{
+ struct inode *bd_inode = sb->s_bdev->bd_inode;
+ struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
+
+ return bdi->dev == NULL;
+}
+
+static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
+{
+ struct super_block *sb = journal->j_private;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ int error = is_journal_aborted(journal);
+ struct ext4_journal_cb_entry *jce;
+
+ BUG_ON(txn->t_state == T_FINISHED);
+ spin_lock(&sbi->s_md_lock);
+ while (!list_empty(&txn->t_private_list)) {
+ jce = list_entry(txn->t_private_list.next,
+ struct ext4_journal_cb_entry, jce_list);
+ list_del_init(&jce->jce_list);
+ spin_unlock(&sbi->s_md_lock);
+ jce->jce_func(sb, jce, error);
+ spin_lock(&sbi->s_md_lock);
+ }
+ spin_unlock(&sbi->s_md_lock);
+}
+
+/* Deal with the reporting of failure conditions on a filesystem such as
+ * inconsistencies detected or read IO failures.
+ *
+ * On ext2, we can store the error state of the filesystem in the
+ * superblock. That is not possible on ext4, because we may have other
+ * write ordering constraints on the superblock which prevent us from
+ * writing it out straight away; and given that the journal is about to
+ * be aborted, we can't rely on the current, or future, transactions to
+ * write out the superblock safely.
+ *
+ * We'll just use the jbd2_journal_abort() error code to record an error in
+ * the journal instead. On recovery, the journal will complain about
+ * that error until we've noted it down and cleared it.
+ */
+
+static void ext4_handle_error(struct super_block *sb)
+{
+ if (sb->s_flags & MS_RDONLY)
+ return;
+
+ if (!test_opt(sb, ERRORS_CONT)) {
+ journal_t *journal = EXT4_SB(sb)->s_journal;
+
+ EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
+ if (journal)
+ jbd2_journal_abort(journal, -EIO);
+ }
+ if (test_opt(sb, ERRORS_RO)) {
+ ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
+ sb->s_flags |= MS_RDONLY;
+ }
+ if (test_opt(sb, ERRORS_PANIC))
+ panic("EXT4-fs (device %s): panic forced after error\n",
+ sb->s_id);
+}
+
+void __ext4_error(struct super_block *sb, const char *function,
+ unsigned int line, const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+ printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
+ sb->s_id, function, line, current->comm, &vaf);
+ va_end(args);
+ save_error_info(sb, function, line);
+
+ ext4_handle_error(sb);
+}
+
+void ext4_error_inode(struct inode *inode, const char *function,
+ unsigned int line, ext4_fsblk_t block,
+ const char *fmt, ...)
+{
+ va_list args;
+ struct va_format vaf;
+ struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
+
+ es->s_last_error_ino = cpu_to_le32(inode->i_ino);
+ es->s_last_error_block = cpu_to_le64(block);
+ save_error_info(inode->i_sb, function, line);
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+ if (block)
+ printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
+ "inode #%lu: block %llu: comm %s: %pV\n",
+ inode->i_sb->s_id, function, line, inode->i_ino,
+ block, current->comm, &vaf);
+ else
+ printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
+ "inode #%lu: comm %s: %pV\n",
+ inode->i_sb->s_id, function, line, inode->i_ino,
+ current->comm, &vaf);
+ va_end(args);
+
+ ext4_handle_error(inode->i_sb);
+}
+
+void ext4_error_file(struct file *file, const char *function,
+ unsigned int line, ext4_fsblk_t block,
+ const char *fmt, ...)
+{
+ va_list args;
+ struct va_format vaf;
+ struct ext4_super_block *es;
+ struct inode *inode = file->f_dentry->d_inode;
+ char pathname[80], *path;
+
+ es = EXT4_SB(inode->i_sb)->s_es;
+ es->s_last_error_ino = cpu_to_le32(inode->i_ino);
+ save_error_info(inode->i_sb, function, line);
+ path = d_path(&(file->f_path), pathname, sizeof(pathname));
+ if (IS_ERR(path))
+ path = "(unknown)";
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+ if (block)
+ printk(KERN_CRIT
+ "EXT4-fs error (device %s): %s:%d: inode #%lu: "
+ "block %llu: comm %s: path %s: %pV\n",
+ inode->i_sb->s_id, function, line, inode->i_ino,
+ block, current->comm, path, &vaf);
+ else
+ printk(KERN_CRIT
+ "EXT4-fs error (device %s): %s:%d: inode #%lu: "
+ "comm %s: path %s: %pV\n",
+ inode->i_sb->s_id, function, line, inode->i_ino,
+ current->comm, path, &vaf);
+ va_end(args);
+
+ ext4_handle_error(inode->i_sb);
+}
+
+static const char *ext4_decode_error(struct super_block *sb, int errno,
+ char nbuf[16])
+{
+ char *errstr = NULL;
+
+ switch (errno) {
+ case -EIO:
+ errstr = "IO failure";
+ break;
+ case -ENOMEM:
+ errstr = "Out of memory";
+ break;
+ case -EROFS:
+ if (!sb || (EXT4_SB(sb)->s_journal &&
+ EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
+ errstr = "Journal has aborted";
+ else
+ errstr = "Readonly filesystem";
+ break;
+ default:
+ /* If the caller passed in an extra buffer for unknown
+ * errors, textualise them now. Else we just return
+ * NULL. */
+ if (nbuf) {
+ /* Check for truncated error codes... */
+ if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
+ errstr = nbuf;
+ }
+ break;
+ }
+
+ return errstr;
+}
+
+/* __ext4_std_error decodes expected errors from journaling functions
+ * automatically and invokes the appropriate error response. */
+
+void __ext4_std_error(struct super_block *sb, const char *function,
+ unsigned int line, int errno)
+{
+ char nbuf[16];
+ const char *errstr;
+
+ /* Special case: if the error is EROFS, and we're not already
+ * inside a transaction, then there's really no point in logging
+ * an error. */
+ if (errno == -EROFS && journal_current_handle() == NULL &&
+ (sb->s_flags & MS_RDONLY))
+ return;
+
+ errstr = ext4_decode_error(sb, errno, nbuf);
+ printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
+ sb->s_id, function, line, errstr);
+ save_error_info(sb, function, line);
+
+ ext4_handle_error(sb);
+}
+
+/*
+ * ext4_abort is a much stronger failure handler than ext4_error. The
+ * abort function may be used to deal with unrecoverable failures such
+ * as journal IO errors or ENOMEM at a critical moment in log management.
+ *
+ * We unconditionally force the filesystem into an ABORT|READONLY state,
+ * unless the error response on the fs has been set to panic in which
+ * case we take the easy way out and panic immediately.
+ */
+
+void __ext4_abort(struct super_block *sb, const char *function,
+ unsigned int line, const char *fmt, ...)
+{
+ va_list args;
+
+ save_error_info(sb, function, line);
+ va_start(args, fmt);
+ printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
+ function, line);
+ vprintk(fmt, args);
+ printk("\n");
+ va_end(args);
+
+ if ((sb->s_flags & MS_RDONLY) == 0) {
+ ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
+ sb->s_flags |= MS_RDONLY;
+ EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
+ if (EXT4_SB(sb)->s_journal)
+ jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
+ save_error_info(sb, function, line);
+ }
+ if (test_opt(sb, ERRORS_PANIC))
+ panic("EXT4-fs panic from previous error\n");
+}
+
+void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+ printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
+ va_end(args);
+}
+
+void __ext4_warning(struct super_block *sb, const char *function,
+ unsigned int line, const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+ printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
+ sb->s_id, function, line, &vaf);
+ va_end(args);
+}
+
+void __ext4_grp_locked_error(const char *function, unsigned int line,
+ struct super_block *sb, ext4_group_t grp,
+ unsigned long ino, ext4_fsblk_t block,
+ const char *fmt, ...)
+__releases(bitlock)
+__acquires(bitlock)
+{
+ struct va_format vaf;
+ va_list args;
+ struct ext4_super_block *es = EXT4_SB(sb)->s_es;
+
+ es->s_last_error_ino = cpu_to_le32(ino);
+ es->s_last_error_block = cpu_to_le64(block);
+ __save_error_info(sb, function, line);
+
+ va_start(args, fmt);
+
+ vaf.fmt = fmt;
+ vaf.va = &args;
+ printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
+ sb->s_id, function, line, grp);
+ if (ino)
+ printk(KERN_CONT "inode %lu: ", ino);
+ if (block)
+ printk(KERN_CONT "block %llu:", (unsigned long long) block);
+ printk(KERN_CONT "%pV\n", &vaf);
+ va_end(args);
+
+ if (test_opt(sb, ERRORS_CONT)) {
+ ext4_commit_super(sb, 0);
+ return;
+ }
+
+ ext4_unlock_group(sb, grp);
+ ext4_handle_error(sb);
+ /*
+ * We only get here in the ERRORS_RO case; relocking the group
+ * may be dangerous, but nothing bad will happen since the
+ * filesystem will have already been marked read/only and the
+ * journal has been aborted. We return 1 as a hint to callers
+ * who might what to use the return value from
+ * ext4_grp_locked_error() to distinguish between the
+ * ERRORS_CONT and ERRORS_RO case, and perhaps return more
+ * aggressively from the ext4 function in question, with a
+ * more appropriate error code.
+ */
+ ext4_lock_group(sb, grp);
+ return;
+}
+
+void ext4_update_dynamic_rev(struct super_block *sb)
+{
+ struct ext4_super_block *es = EXT4_SB(sb)->s_es;
+
+ if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
+ return;
+
+ ext4_warning(sb,
+ "updating to rev %d because of new feature flag, "
+ "running e2fsck is recommended",
+ EXT4_DYNAMIC_REV);
+
+ es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
+ es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
+ es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
+ /* leave es->s_feature_*compat flags alone */
+ /* es->s_uuid will be set by e2fsck if empty */
+
+ /*
+ * The rest of the superblock fields should be zero, and if not it
+ * means they are likely already in use, so leave them alone. We
+ * can leave it up to e2fsck to clean up any inconsistencies there.
+ */
+}
+
+/*
+ * Open the external journal device
+ */
+static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
+{
+ struct block_device *bdev;
+ char b[BDEVNAME_SIZE];
+
+ bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
+ if (IS_ERR(bdev))
+ goto fail;
+ return bdev;
+
+fail:
+ ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
+ __bdevname(dev, b), PTR_ERR(bdev));
+ return NULL;
+}
+
+/*
+ * Release the journal device
+ */
+static int ext4_blkdev_put(struct block_device *bdev)
+{
+ return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
+}
+
+static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
+{
+ struct block_device *bdev;
+ int ret = -ENODEV;
+
+ bdev = sbi->journal_bdev;
+ if (bdev) {
+ ret = ext4_blkdev_put(bdev);
+ sbi->journal_bdev = NULL;
+ }
+ return ret;
+}
+
+static inline struct inode *orphan_list_entry(struct list_head *l)
+{
+ return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
+}
+
+static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
+{
+ struct list_head *l;
+
+ ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
+ le32_to_cpu(sbi->s_es->s_last_orphan));
+
+ printk(KERN_ERR "sb_info orphan list:\n");
+ list_for_each(l, &sbi->s_orphan) {
+ struct inode *inode = orphan_list_entry(l);
+ printk(KERN_ERR " "
+ "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
+ inode->i_sb->s_id, inode->i_ino, inode,
+ inode->i_mode, inode->i_nlink,
+ NEXT_ORPHAN(inode));
+ }
+}
+
+static void ext4_put_super(struct super_block *sb)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_super_block *es = sbi->s_es;
+ int i, err;
+
+ ext4_unregister_li_request(sb);
+ dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
+
+ flush_workqueue(sbi->dio_unwritten_wq);
+ destroy_workqueue(sbi->dio_unwritten_wq);
+
+ lock_super(sb);
+ if (sbi->s_journal) {
+ err = jbd2_journal_destroy(sbi->s_journal);
+ sbi->s_journal = NULL;
+ if (err < 0)
+ ext4_abort(sb, "Couldn't clean up the journal");
+ }
+
+ del_timer(&sbi->s_err_report);
+ ext4_release_system_zone(sb);
+ ext4_mb_release(sb);
+ ext4_ext_release(sb);
+ ext4_xattr_put_super(sb);
+
+ if (!(sb->s_flags & MS_RDONLY)) {
+ EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
+ es->s_state = cpu_to_le16(sbi->s_mount_state);
+ }
+ if (sb->s_dirt || !(sb->s_flags & MS_RDONLY))
+ ext4_commit_super(sb, 1);
+
+ if (sbi->s_proc) {
+ remove_proc_entry("options", sbi->s_proc);
+ remove_proc_entry(sb->s_id, ext4_proc_root);
+ }
+ kobject_del(&sbi->s_kobj);
+
+ for (i = 0; i < sbi->s_gdb_count; i++)
+ brelse(sbi->s_group_desc[i]);
+ ext4_kvfree(sbi->s_group_desc);
+ ext4_kvfree(sbi->s_flex_groups);
+ percpu_counter_destroy(&sbi->s_freeclusters_counter);
+ percpu_counter_destroy(&sbi->s_freeinodes_counter);
+ percpu_counter_destroy(&sbi->s_dirs_counter);
+ percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
+ brelse(sbi->s_sbh);
+#ifdef CONFIG_QUOTA
+ for (i = 0; i < MAXQUOTAS; i++)
+ kfree(sbi->s_qf_names[i]);
+#endif
+
+ /* Debugging code just in case the in-memory inode orphan list
+ * isn't empty. The on-disk one can be non-empty if we've
+ * detected an error and taken the fs readonly, but the
+ * in-memory list had better be clean by this point. */
+ if (!list_empty(&sbi->s_orphan))
+ dump_orphan_list(sb, sbi);
+ J_ASSERT(list_empty(&sbi->s_orphan));
+
+ sync_blockdev(sb->s_bdev);
+ invalidate_bdev(sb->s_bdev);
+ if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
+ /*
+ * Invalidate the journal device's buffers. We don't want them
+ * floating about in memory - the physical journal device may
+ * hotswapped, and it breaks the `ro-after' testing code.
+ */
+ sync_blockdev(sbi->journal_bdev);
+ invalidate_bdev(sbi->journal_bdev);
+ ext4_blkdev_remove(sbi);
+ }
+ if (sbi->s_mmp_tsk)
+ kthread_stop(sbi->s_mmp_tsk);
+ sb->s_fs_info = NULL;
+ /*
+ * Now that we are completely done shutting down the
+ * superblock, we need to actually destroy the kobject.
+ */
+ unlock_super(sb);
+ kobject_put(&sbi->s_kobj);
+ wait_for_completion(&sbi->s_kobj_unregister);
+ kfree(sbi->s_blockgroup_lock);
+ kfree(sbi);
+}
+
+static struct kmem_cache *ext4_inode_cachep;
+
+/*
+ * Called inside transaction, so use GFP_NOFS
+ */
+static struct inode *ext4_alloc_inode(struct super_block *sb)
+{
+ struct ext4_inode_info *ei;
+
+ ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
+ if (!ei)
+ return NULL;
+
+ ei->vfs_inode.i_version = 1;
+ ei->vfs_inode.i_data.writeback_index = 0;
+ memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
+ INIT_LIST_HEAD(&ei->i_prealloc_list);
+ spin_lock_init(&ei->i_prealloc_lock);
+ ei->i_reserved_data_blocks = 0;
+ ei->i_reserved_meta_blocks = 0;
+ ei->i_allocated_meta_blocks = 0;
+ ei->i_da_metadata_calc_len = 0;
+ ei->i_da_metadata_calc_last_lblock = 0;
+ spin_lock_init(&(ei->i_block_reservation_lock));
+#ifdef CONFIG_QUOTA
+ ei->i_reserved_quota = 0;
+#endif
+ ei->jinode = NULL;
+ INIT_LIST_HEAD(&ei->i_completed_io_list);
+ spin_lock_init(&ei->i_completed_io_lock);
+ ei->cur_aio_dio = NULL;
+ ei->i_sync_tid = 0;
+ ei->i_datasync_tid = 0;
+ atomic_set(&ei->i_ioend_count, 0);
+ atomic_set(&ei->i_aiodio_unwritten, 0);
+
+ return &ei->vfs_inode;
+}
+
+static int ext4_drop_inode(struct inode *inode)
+{
+ int drop = generic_drop_inode(inode);
+
+ trace_ext4_drop_inode(inode, drop);
+ return drop;
+}
+
+static void ext4_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
+}
+
+static void ext4_destroy_inode(struct inode *inode)
+{
+ if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
+ ext4_msg(inode->i_sb, KERN_ERR,
+ "Inode %lu (%p): orphan list check failed!",
+ inode->i_ino, EXT4_I(inode));
+ print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
+ EXT4_I(inode), sizeof(struct ext4_inode_info),
+ true);
+ dump_stack();
+ }
+ call_rcu(&inode->i_rcu, ext4_i_callback);
+}
+
+static void init_once(void *foo)
+{
+ struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
+
+ INIT_LIST_HEAD(&ei->i_orphan);
+#ifdef CONFIG_EXT4_FS_XATTR
+ init_rwsem(&ei->xattr_sem);
+#endif
+ init_rwsem(&ei->i_data_sem);
+ inode_init_once(&ei->vfs_inode);
+}
+
+static int init_inodecache(void)
+{
+ ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
+ sizeof(struct ext4_inode_info),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ init_once);
+ if (ext4_inode_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static void destroy_inodecache(void)
+{
+ kmem_cache_destroy(ext4_inode_cachep);
+}
+
+void ext4_clear_inode(struct inode *inode)
+{
+ invalidate_inode_buffers(inode);
+ end_writeback(inode);
+ dquot_drop(inode);
+ ext4_discard_preallocations(inode);
+ if (EXT4_I(inode)->jinode) {
+ jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
+ EXT4_I(inode)->jinode);
+ jbd2_free_inode(EXT4_I(inode)->jinode);
+ EXT4_I(inode)->jinode = NULL;
+ }
+}
+
+static struct inode *ext4_nfs_get_inode(struct super_block *sb,
+ u64 ino, u32 generation)
+{
+ struct inode *inode;
+
+ if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
+ return ERR_PTR(-ESTALE);
+ if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
+ return ERR_PTR(-ESTALE);
+
+ /* iget isn't really right if the inode is currently unallocated!!
+ *
+ * ext4_read_inode will return a bad_inode if the inode had been
+ * deleted, so we should be safe.
+ *
+ * Currently we don't know the generation for parent directory, so
+ * a generation of 0 means "accept any"
+ */
+ inode = ext4_iget_normal(sb, ino);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+ if (generation && inode->i_generation != generation) {
+ iput(inode);
+ return ERR_PTR(-ESTALE);
+ }
+
+ return inode;
+}
+
+static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type)
+{
+ return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+ ext4_nfs_get_inode);
+}
+
+static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type)
+{
+ return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+ ext4_nfs_get_inode);
+}
+
+/*
+ * Try to release metadata pages (indirect blocks, directories) which are
+ * mapped via the block device. Since these pages could have journal heads
+ * which would prevent try_to_free_buffers() from freeing them, we must use
+ * jbd2 layer's try_to_free_buffers() function to release them.
+ */
+static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
+ gfp_t wait)
+{
+ journal_t *journal = EXT4_SB(sb)->s_journal;
+
+ WARN_ON(PageChecked(page));
+ if (!page_has_buffers(page))
+ return 0;
+ if (journal)
+ return jbd2_journal_try_to_free_buffers(journal, page,
+ wait & ~__GFP_WAIT);
+ return try_to_free_buffers(page);
+}
+
+#ifdef CONFIG_QUOTA
+#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
+#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
+
+static int ext4_write_dquot(struct dquot *dquot);
+static int ext4_acquire_dquot(struct dquot *dquot);
+static int ext4_release_dquot(struct dquot *dquot);
+static int ext4_mark_dquot_dirty(struct dquot *dquot);
+static int ext4_write_info(struct super_block *sb, int type);
+static int ext4_quota_on(struct super_block *sb, int type, int format_id,
+ struct path *path);
+static int ext4_quota_off(struct super_block *sb, int type);
+static int ext4_quota_on_mount(struct super_block *sb, int type);
+static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
+ size_t len, loff_t off);
+static ssize_t ext4_quota_write(struct super_block *sb, int type,
+ const char *data, size_t len, loff_t off);
+
+static const struct dquot_operations ext4_quota_operations = {
+ .get_reserved_space = ext4_get_reserved_space,
+ .write_dquot = ext4_write_dquot,
+ .acquire_dquot = ext4_acquire_dquot,
+ .release_dquot = ext4_release_dquot,
+ .mark_dirty = ext4_mark_dquot_dirty,
+ .write_info = ext4_write_info,
+ .alloc_dquot = dquot_alloc,
+ .destroy_dquot = dquot_destroy,
+};
+
+static const struct quotactl_ops ext4_qctl_operations = {
+ .quota_on = ext4_quota_on,
+ .quota_off = ext4_quota_off,
+ .quota_sync = dquot_quota_sync,
+ .get_info = dquot_get_dqinfo,
+ .set_info = dquot_set_dqinfo,
+ .get_dqblk = dquot_get_dqblk,
+ .set_dqblk = dquot_set_dqblk
+};
+#endif
+
+static const struct super_operations ext4_sops = {
+ .alloc_inode = ext4_alloc_inode,
+ .destroy_inode = ext4_destroy_inode,
+ .write_inode = ext4_write_inode,
+ .dirty_inode = ext4_dirty_inode,
+ .drop_inode = ext4_drop_inode,
+ .evict_inode = ext4_evict_inode,
+ .put_super = ext4_put_super,
+ .sync_fs = ext4_sync_fs,
+ .freeze_fs = ext4_freeze,
+ .unfreeze_fs = ext4_unfreeze,
+ .statfs = ext4_statfs,
+ .remount_fs = ext4_remount,
+ .show_options = ext4_show_options,
+#ifdef CONFIG_QUOTA
+ .quota_read = ext4_quota_read,
+ .quota_write = ext4_quota_write,
+#endif
+ .bdev_try_to_free_page = bdev_try_to_free_page,
+};
+
+static const struct super_operations ext4_nojournal_sops = {
+ .alloc_inode = ext4_alloc_inode,
+ .destroy_inode = ext4_destroy_inode,
+ .write_inode = ext4_write_inode,
+ .dirty_inode = ext4_dirty_inode,
+ .drop_inode = ext4_drop_inode,
+ .evict_inode = ext4_evict_inode,
+ .write_super = ext4_write_super,
+ .put_super = ext4_put_super,
+ .statfs = ext4_statfs,
+ .remount_fs = ext4_remount,
+ .show_options = ext4_show_options,
+#ifdef CONFIG_QUOTA
+ .quota_read = ext4_quota_read,
+ .quota_write = ext4_quota_write,
+#endif
+ .bdev_try_to_free_page = bdev_try_to_free_page,
+};
+
+static const struct export_operations ext4_export_ops = {
+ .fh_to_dentry = ext4_fh_to_dentry,
+ .fh_to_parent = ext4_fh_to_parent,
+ .get_parent = ext4_get_parent,
+};
+
+enum {
+ Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
+ Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
+ Opt_nouid32, Opt_debug, Opt_removed,
+ Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
+ Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
+ Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
+ Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
+ Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
+ Opt_data_err_abort, Opt_data_err_ignore,
+ Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
+ Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
+ Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
+ Opt_usrquota, Opt_grpquota, Opt_i_version,
+ Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
+ Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
+ Opt_inode_readahead_blks, Opt_journal_ioprio,
+ Opt_dioread_nolock, Opt_dioread_lock,
+ Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
+};
+
+static const match_table_t tokens = {
+ {Opt_bsd_df, "bsddf"},
+ {Opt_minix_df, "minixdf"},
+ {Opt_grpid, "grpid"},
+ {Opt_grpid, "bsdgroups"},
+ {Opt_nogrpid, "nogrpid"},
+ {Opt_nogrpid, "sysvgroups"},
+ {Opt_resgid, "resgid=%u"},
+ {Opt_resuid, "resuid=%u"},
+ {Opt_sb, "sb=%u"},
+ {Opt_err_cont, "errors=continue"},
+ {Opt_err_panic, "errors=panic"},
+ {Opt_err_ro, "errors=remount-ro"},
+ {Opt_nouid32, "nouid32"},
+ {Opt_debug, "debug"},
+ {Opt_removed, "oldalloc"},
+ {Opt_removed, "orlov"},
+ {Opt_user_xattr, "user_xattr"},
+ {Opt_nouser_xattr, "nouser_xattr"},
+ {Opt_acl, "acl"},
+ {Opt_noacl, "noacl"},
+ {Opt_noload, "norecovery"},
+ {Opt_noload, "noload"},
+ {Opt_removed, "nobh"},
+ {Opt_removed, "bh"},
+ {Opt_commit, "commit=%u"},
+ {Opt_min_batch_time, "min_batch_time=%u"},
+ {Opt_max_batch_time, "max_batch_time=%u"},
+ {Opt_journal_dev, "journal_dev=%u"},
+ {Opt_journal_checksum, "journal_checksum"},
+ {Opt_journal_async_commit, "journal_async_commit"},
+ {Opt_abort, "abort"},
+ {Opt_data_journal, "data=journal"},
+ {Opt_data_ordered, "data=ordered"},
+ {Opt_data_writeback, "data=writeback"},
+ {Opt_data_err_abort, "data_err=abort"},
+ {Opt_data_err_ignore, "data_err=ignore"},
+ {Opt_offusrjquota, "usrjquota="},
+ {Opt_usrjquota, "usrjquota=%s"},
+ {Opt_offgrpjquota, "grpjquota="},
+ {Opt_grpjquota, "grpjquota=%s"},
+ {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
+ {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
+ {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
+ {Opt_grpquota, "grpquota"},
+ {Opt_noquota, "noquota"},
+ {Opt_quota, "quota"},
+ {Opt_usrquota, "usrquota"},
+ {Opt_barrier, "barrier=%u"},
+ {Opt_barrier, "barrier"},
+ {Opt_nobarrier, "nobarrier"},
+ {Opt_i_version, "i_version"},
+ {Opt_stripe, "stripe=%u"},
+ {Opt_delalloc, "delalloc"},
+ {Opt_nodelalloc, "nodelalloc"},
+ {Opt_mblk_io_submit, "mblk_io_submit"},
+ {Opt_nomblk_io_submit, "nomblk_io_submit"},
+ {Opt_block_validity, "block_validity"},
+ {Opt_noblock_validity, "noblock_validity"},
+ {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
+ {Opt_journal_ioprio, "journal_ioprio=%u"},
+ {Opt_auto_da_alloc, "auto_da_alloc=%u"},
+ {Opt_auto_da_alloc, "auto_da_alloc"},
+ {Opt_noauto_da_alloc, "noauto_da_alloc"},
+ {Opt_dioread_nolock, "dioread_nolock"},
+ {Opt_dioread_lock, "dioread_lock"},
+ {Opt_discard, "discard"},
+ {Opt_nodiscard, "nodiscard"},
+ {Opt_init_itable, "init_itable=%u"},
+ {Opt_init_itable, "init_itable"},
+ {Opt_noinit_itable, "noinit_itable"},
+ {Opt_removed, "check=none"}, /* mount option from ext2/3 */
+ {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
+ {Opt_removed, "reservation"}, /* mount option from ext2/3 */
+ {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
+ {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
+ {Opt_err, NULL},
+};
+
+static ext4_fsblk_t get_sb_block(void **data)
+{
+ ext4_fsblk_t sb_block;
+ char *options = (char *) *data;
+
+ if (!options || strncmp(options, "sb=", 3) != 0)
+ return 1; /* Default location */
+
+ options += 3;
+ /* TODO: use simple_strtoll with >32bit ext4 */
+ sb_block = simple_strtoul(options, &options, 0);
+ if (*options && *options != ',') {
+ printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
+ (char *) *data);
+ return 1;
+ }
+ if (*options == ',')
+ options++;
+ *data = (void *) options;
+
+ return sb_block;
+}
+
+#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
+static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
+ "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
+
+#ifdef CONFIG_QUOTA
+static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ char *qname;
+
+ if (sb_any_quota_loaded(sb) &&
+ !sbi->s_qf_names[qtype]) {
+ ext4_msg(sb, KERN_ERR,
+ "Cannot change journaled "
+ "quota options when quota turned on");
+ return -1;
+ }
+ qname = match_strdup(args);
+ if (!qname) {
+ ext4_msg(sb, KERN_ERR,
+ "Not enough memory for storing quotafile name");
+ return -1;
+ }
+ if (sbi->s_qf_names[qtype] &&
+ strcmp(sbi->s_qf_names[qtype], qname)) {
+ ext4_msg(sb, KERN_ERR,
+ "%s quota file already specified", QTYPE2NAME(qtype));
+ kfree(qname);
+ return -1;
+ }
+ sbi->s_qf_names[qtype] = qname;
+ if (strchr(sbi->s_qf_names[qtype], '/')) {
+ ext4_msg(sb, KERN_ERR,
+ "quotafile must be on filesystem root");
+ kfree(sbi->s_qf_names[qtype]);
+ sbi->s_qf_names[qtype] = NULL;
+ return -1;
+ }
+ set_opt(sb, QUOTA);
+ return 1;
+}
+
+static int clear_qf_name(struct super_block *sb, int qtype)
+{
+
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+
+ if (sb_any_quota_loaded(sb) &&
+ sbi->s_qf_names[qtype]) {
+ ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
+ " when quota turned on");
+ return -1;
+ }
+ /*
+ * The space will be released later when all options are confirmed
+ * to be correct
+ */
+ sbi->s_qf_names[qtype] = NULL;
+ return 1;
+}
+#endif
+
+#define MOPT_SET 0x0001
+#define MOPT_CLEAR 0x0002
+#define MOPT_NOSUPPORT 0x0004
+#define MOPT_EXPLICIT 0x0008
+#define MOPT_CLEAR_ERR 0x0010
+#define MOPT_GTE0 0x0020
+#ifdef CONFIG_QUOTA
+#define MOPT_Q 0
+#define MOPT_QFMT 0x0040
+#else
+#define MOPT_Q MOPT_NOSUPPORT
+#define MOPT_QFMT MOPT_NOSUPPORT
+#endif
+#define MOPT_DATAJ 0x0080
+
+static const struct mount_opts {
+ int token;
+ int mount_opt;
+ int flags;
+} ext4_mount_opts[] = {
+ {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
+ {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
+ {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
+ {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
+ {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
+ {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
+ {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
+ {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
+ {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
+ {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
+ {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
+ {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
+ {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
+ {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
+ {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
+ {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
+ EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
+ {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
+ {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
+ {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
+ {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
+ {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
+ {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
+ {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
+ {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
+ {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
+ {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
+ {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
+ {Opt_commit, 0, MOPT_GTE0},
+ {Opt_max_batch_time, 0, MOPT_GTE0},
+ {Opt_min_batch_time, 0, MOPT_GTE0},
+ {Opt_inode_readahead_blks, 0, MOPT_GTE0},
+ {Opt_init_itable, 0, MOPT_GTE0},
+ {Opt_stripe, 0, MOPT_GTE0},
+ {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
+ {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
+ {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
+#ifdef CONFIG_EXT4_FS_XATTR
+ {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
+ {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
+#else
+ {Opt_user_xattr, 0, MOPT_NOSUPPORT},
+ {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
+#endif
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
+ {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
+ {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
+#else
+ {Opt_acl, 0, MOPT_NOSUPPORT},
+ {Opt_noacl, 0, MOPT_NOSUPPORT},
+#endif
+ {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
+ {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
+ {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
+ {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
+ MOPT_SET | MOPT_Q},
+ {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
+ MOPT_SET | MOPT_Q},
+ {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
+ EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
+ {Opt_usrjquota, 0, MOPT_Q},
+ {Opt_grpjquota, 0, MOPT_Q},
+ {Opt_offusrjquota, 0, MOPT_Q},
+ {Opt_offgrpjquota, 0, MOPT_Q},
+ {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
+ {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
+ {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
+ {Opt_err, 0, 0}
+};
+
+static int handle_mount_opt(struct super_block *sb, char *opt, int token,
+ substring_t *args, unsigned long *journal_devnum,
+ unsigned int *journal_ioprio, int is_remount)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ const struct mount_opts *m;
+ int arg = 0;
+
+#ifdef CONFIG_QUOTA
+ if (token == Opt_usrjquota)
+ return set_qf_name(sb, USRQUOTA, &args[0]);
+ else if (token == Opt_grpjquota)
+ return set_qf_name(sb, GRPQUOTA, &args[0]);
+ else if (token == Opt_offusrjquota)
+ return clear_qf_name(sb, USRQUOTA);
+ else if (token == Opt_offgrpjquota)
+ return clear_qf_name(sb, GRPQUOTA);
+#endif
+ if (args->from && match_int(args, &arg))
+ return -1;
+ switch (token) {
+ case Opt_noacl:
+ case Opt_nouser_xattr:
+ ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
+ break;
+ case Opt_sb:
+ return 1; /* handled by get_sb_block() */
+ case Opt_removed:
+ ext4_msg(sb, KERN_WARNING,
+ "Ignoring removed %s option", opt);
+ return 1;
+ case Opt_resuid:
+ sbi->s_resuid = arg;
+ return 1;
+ case Opt_resgid:
+ sbi->s_resgid = arg;
+ return 1;
+ case Opt_abort:
+ sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
+ return 1;
+ case Opt_i_version:
+ sb->s_flags |= MS_I_VERSION;
+ return 1;
+ case Opt_journal_dev:
+ if (is_remount) {
+ ext4_msg(sb, KERN_ERR,
+ "Cannot specify journal on remount");
+ return -1;
+ }
+ *journal_devnum = arg;
+ return 1;
+ case Opt_journal_ioprio:
+ if (arg < 0 || arg > 7)
+ return -1;
+ *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
+ return 1;
+ }
+
+ for (m = ext4_mount_opts; m->token != Opt_err; m++) {
+ if (token != m->token)
+ continue;
+ if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
+ return -1;
+ if (m->flags & MOPT_EXPLICIT)
+ set_opt2(sb, EXPLICIT_DELALLOC);
+ if (m->flags & MOPT_CLEAR_ERR)
+ clear_opt(sb, ERRORS_MASK);
+ if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
+ ext4_msg(sb, KERN_ERR, "Cannot change quota "
+ "options when quota turned on");
+ return -1;
+ }
+
+ if (m->flags & MOPT_NOSUPPORT) {
+ ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
+ } else if (token == Opt_commit) {
+ if (arg == 0)
+ arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
+ sbi->s_commit_interval = HZ * arg;
+ } else if (token == Opt_max_batch_time) {
+ if (arg == 0)
+ arg = EXT4_DEF_MAX_BATCH_TIME;
+ sbi->s_max_batch_time = arg;
+ } else if (token == Opt_min_batch_time) {
+ sbi->s_min_batch_time = arg;
+ } else if (token == Opt_inode_readahead_blks) {
+ if (arg > (1 << 30))
+ return -1;
+ if (arg && !is_power_of_2(arg)) {
+ ext4_msg(sb, KERN_ERR,
+ "EXT4-fs: inode_readahead_blks"
+ " must be a power of 2");
+ return -1;
+ }
+ sbi->s_inode_readahead_blks = arg;
+ } else if (token == Opt_init_itable) {
+ set_opt(sb, INIT_INODE_TABLE);
+ if (!args->from)
+ arg = EXT4_DEF_LI_WAIT_MULT;
+ sbi->s_li_wait_mult = arg;
+ } else if (token == Opt_stripe) {
+ sbi->s_stripe = arg;
+ } else if (m->flags & MOPT_DATAJ) {
+ if (is_remount) {
+ if (!sbi->s_journal)
+ ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
+ else if (test_opt(sb, DATA_FLAGS) !=
+ m->mount_opt) {
+ ext4_msg(sb, KERN_ERR,
+ "Cannot change data mode on remount");
+ return -1;
+ }
+ } else {
+ clear_opt(sb, DATA_FLAGS);
+ sbi->s_mount_opt |= m->mount_opt;
+ }
+#ifdef CONFIG_QUOTA
+ } else if (m->flags & MOPT_QFMT) {
+ if (sb_any_quota_loaded(sb) &&
+ sbi->s_jquota_fmt != m->mount_opt) {
+ ext4_msg(sb, KERN_ERR, "Cannot "
+ "change journaled quota options "
+ "when quota turned on");
+ return -1;
+ }
+ sbi->s_jquota_fmt = m->mount_opt;
+#endif
+ } else {
+ if (!args->from)
+ arg = 1;
+ if (m->flags & MOPT_CLEAR)
+ arg = !arg;
+ else if (unlikely(!(m->flags & MOPT_SET))) {
+ ext4_msg(sb, KERN_WARNING,
+ "buggy handling of option %s", opt);
+ WARN_ON(1);
+ return -1;
+ }
+ if (arg != 0)
+ sbi->s_mount_opt |= m->mount_opt;
+ else
+ sbi->s_mount_opt &= ~m->mount_opt;
+ }
+ return 1;
+ }
+ ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
+ "or missing value", opt);
+ return -1;
+}
+
+static int parse_options(char *options, struct super_block *sb,
+ unsigned long *journal_devnum,
+ unsigned int *journal_ioprio,
+ int is_remount)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ char *p;
+ substring_t args[MAX_OPT_ARGS];
+ int token;
+
+ if (!options)
+ return 1;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ if (!*p)
+ continue;
+ /*
+ * Initialize args struct so we know whether arg was
+ * found; some options take optional arguments.
+ */
+ args[0].to = args[0].from = 0;
+ token = match_token(p, tokens, args);
+ if (handle_mount_opt(sb, p, token, args, journal_devnum,
+ journal_ioprio, is_remount) < 0)
+ return 0;
+ }
+#ifdef CONFIG_QUOTA
+ if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
+ if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
+ clear_opt(sb, USRQUOTA);
+
+ if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
+ clear_opt(sb, GRPQUOTA);
+
+ if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
+ ext4_msg(sb, KERN_ERR, "old and new quota "
+ "format mixing");
+ return 0;
+ }
+
+ if (!sbi->s_jquota_fmt) {
+ ext4_msg(sb, KERN_ERR, "journaled quota format "
+ "not specified");
+ return 0;
+ }
+ }
+#endif
+ if (test_opt(sb, DIOREAD_NOLOCK)) {
+ int blocksize =
+ BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
+
+ if (blocksize < PAGE_CACHE_SIZE) {
+ ext4_msg(sb, KERN_ERR, "can't mount with "
+ "dioread_nolock if block size != PAGE_SIZE");
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static inline void ext4_show_quota_options(struct seq_file *seq,
+ struct super_block *sb)
+{
+#if defined(CONFIG_QUOTA)
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+
+ if (sbi->s_jquota_fmt) {
+ char *fmtname = "";
+
+ switch (sbi->s_jquota_fmt) {
+ case QFMT_VFS_OLD:
+ fmtname = "vfsold";
+ break;
+ case QFMT_VFS_V0:
+ fmtname = "vfsv0";
+ break;
+ case QFMT_VFS_V1:
+ fmtname = "vfsv1";
+ break;
+ }
+ seq_printf(seq, ",jqfmt=%s", fmtname);
+ }
+
+ if (sbi->s_qf_names[USRQUOTA])
+ seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
+
+ if (sbi->s_qf_names[GRPQUOTA])
+ seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
+
+ if (test_opt(sb, USRQUOTA))
+ seq_puts(seq, ",usrquota");
+
+ if (test_opt(sb, GRPQUOTA))
+ seq_puts(seq, ",grpquota");
+#endif
+}
+
+static const char *token2str(int token)
+{
+ const struct match_token *t;
+
+ for (t = tokens; t->token != Opt_err; t++)
+ if (t->token == token && !strchr(t->pattern, '='))
+ break;
+ return t->pattern;
+}
+
+/*
+ * Show an option if
+ * - it's set to a non-default value OR
+ * - if the per-sb default is different from the global default
+ */
+static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
+ int nodefs)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_super_block *es = sbi->s_es;
+ int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
+ const struct mount_opts *m;
+ char sep = nodefs ? '\n' : ',';
+
+#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
+#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
+
+ if (sbi->s_sb_block != 1)
+ SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
+
+ for (m = ext4_mount_opts; m->token != Opt_err; m++) {
+ int want_set = m->flags & MOPT_SET;
+ if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
+ (m->flags & MOPT_CLEAR_ERR))
+ continue;
+ if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
+ continue; /* skip if same as the default */
+ if ((want_set &&
+ (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
+ (!want_set && (sbi->s_mount_opt & m->mount_opt)))
+ continue; /* select Opt_noFoo vs Opt_Foo */
+ SEQ_OPTS_PRINT("%s", token2str(m->token));
+ }
+
+ if (nodefs || sbi->s_resuid != EXT4_DEF_RESUID ||
+ le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
+ SEQ_OPTS_PRINT("resuid=%u", sbi->s_resuid);
+ if (nodefs || sbi->s_resgid != EXT4_DEF_RESGID ||
+ le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
+ SEQ_OPTS_PRINT("resgid=%u", sbi->s_resgid);
+ def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
+ if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
+ SEQ_OPTS_PUTS("errors=remount-ro");
+ if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
+ SEQ_OPTS_PUTS("errors=continue");
+ if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
+ SEQ_OPTS_PUTS("errors=panic");
+ if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
+ SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
+ if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
+ SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
+ if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
+ SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
+ if (sb->s_flags & MS_I_VERSION)
+ SEQ_OPTS_PUTS("i_version");
+ if (nodefs || sbi->s_stripe)
+ SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
+ if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
+ if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
+ SEQ_OPTS_PUTS("data=journal");
+ else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
+ SEQ_OPTS_PUTS("data=ordered");
+ else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
+ SEQ_OPTS_PUTS("data=writeback");
+ }
+ if (nodefs ||
+ sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
+ SEQ_OPTS_PRINT("inode_readahead_blks=%u",
+ sbi->s_inode_readahead_blks);
+
+ if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
+ (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
+ SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
+
+ ext4_show_quota_options(seq, sb);
+ return 0;
+}
+
+static int ext4_show_options(struct seq_file *seq, struct dentry *root)
+{
+ return _ext4_show_options(seq, root->d_sb, 0);
+}
+
+static int options_seq_show(struct seq_file *seq, void *offset)
+{
+ struct super_block *sb = seq->private;
+ int rc;
+
+ seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
+ rc = _ext4_show_options(seq, sb, 1);
+ seq_puts(seq, "\n");
+ return rc;
+}
+
+static int options_open_fs(struct inode *inode, struct file *file)
+{
+ return single_open(file, options_seq_show, PDE(inode)->data);
+}
+
+static const struct file_operations ext4_seq_options_fops = {
+ .owner = THIS_MODULE,
+ .open = options_open_fs,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
+ int read_only)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ int res = 0;
+
+ if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
+ ext4_msg(sb, KERN_ERR, "revision level too high, "
+ "forcing read-only mode");
+ res = MS_RDONLY;
+ }
+ if (read_only)
+ goto done;
+ if (!(sbi->s_mount_state & EXT4_VALID_FS))
+ ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
+ "running e2fsck is recommended");
+ else if ((sbi->s_mount_state & EXT4_ERROR_FS))
+ ext4_msg(sb, KERN_WARNING,
+ "warning: mounting fs with errors, "
+ "running e2fsck is recommended");
+ else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
+ le16_to_cpu(es->s_mnt_count) >=
+ (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
+ ext4_msg(sb, KERN_WARNING,
+ "warning: maximal mount count reached, "
+ "running e2fsck is recommended");
+ else if (le32_to_cpu(es->s_checkinterval) &&
+ (le32_to_cpu(es->s_lastcheck) +
+ le32_to_cpu(es->s_checkinterval) <= get_seconds()))
+ ext4_msg(sb, KERN_WARNING,
+ "warning: checktime reached, "
+ "running e2fsck is recommended");
+ if (!sbi->s_journal)
+ es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
+ if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
+ es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
+ le16_add_cpu(&es->s_mnt_count, 1);
+ es->s_mtime = cpu_to_le32(get_seconds());
+ ext4_update_dynamic_rev(sb);
+ if (sbi->s_journal)
+ EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
+
+ ext4_commit_super(sb, 1);
+done:
+ if (test_opt(sb, DEBUG))
+ printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
+ "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
+ sb->s_blocksize,
+ sbi->s_groups_count,
+ EXT4_BLOCKS_PER_GROUP(sb),
+ EXT4_INODES_PER_GROUP(sb),
+ sbi->s_mount_opt, sbi->s_mount_opt2);
+
+ cleancache_init_fs(sb);
+ return res;
+}
+
+static int ext4_fill_flex_info(struct super_block *sb)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_group_desc *gdp = NULL;
+ ext4_group_t flex_group_count;
+ ext4_group_t flex_group;
+ unsigned int groups_per_flex = 0;
+ size_t size;
+ int i;
+
+ sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
+ if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
+ sbi->s_log_groups_per_flex = 0;
+ return 1;
+ }
+ groups_per_flex = 1 << sbi->s_log_groups_per_flex;
+
+ /* We allocate both existing and potentially added groups */
+ flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
+ ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
+ EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
+ size = flex_group_count * sizeof(struct flex_groups);
+ sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
+ if (sbi->s_flex_groups == NULL) {
+ ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
+ flex_group_count);
+ goto failed;
+ }
+
+ for (i = 0; i < sbi->s_groups_count; i++) {
+ gdp = ext4_get_group_desc(sb, i, NULL);
+
+ flex_group = ext4_flex_group(sbi, i);
+ atomic_add(ext4_free_inodes_count(sb, gdp),
+ &sbi->s_flex_groups[flex_group].free_inodes);
+ atomic64_add(ext4_free_group_clusters(sb, gdp),
+ &sbi->s_flex_groups[flex_group].free_clusters);
+ atomic_add(ext4_used_dirs_count(sb, gdp),
+ &sbi->s_flex_groups[flex_group].used_dirs);
+ }
+
+ return 1;
+failed:
+ return 0;
+}
+
+__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
+ struct ext4_group_desc *gdp)
+{
+ __u16 crc = 0;
+
+ if (sbi->s_es->s_feature_ro_compat &
+ cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
+ int offset = offsetof(struct ext4_group_desc, bg_checksum);
+ __le32 le_group = cpu_to_le32(block_group);
+
+ crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
+ crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
+ crc = crc16(crc, (__u8 *)gdp, offset);
+ offset += sizeof(gdp->bg_checksum); /* skip checksum */
+ /* for checksum of struct ext4_group_desc do the rest...*/
+ if ((sbi->s_es->s_feature_incompat &
+ cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
+ offset < le16_to_cpu(sbi->s_es->s_desc_size))
+ crc = crc16(crc, (__u8 *)gdp + offset,
+ le16_to_cpu(sbi->s_es->s_desc_size) -
+ offset);
+ }
+
+ return cpu_to_le16(crc);
+}
+
+int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
+ struct ext4_group_desc *gdp)
+{
+ if ((sbi->s_es->s_feature_ro_compat &
+ cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
+ (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
+ return 0;
+
+ return 1;
+}
+
+/* Called at mount-time, super-block is locked */
+static int ext4_check_descriptors(struct super_block *sb,
+ ext4_group_t *first_not_zeroed)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
+ ext4_fsblk_t last_block;
+ ext4_fsblk_t block_bitmap;
+ ext4_fsblk_t inode_bitmap;
+ ext4_fsblk_t inode_table;
+ int flexbg_flag = 0;
+ ext4_group_t i, grp = sbi->s_groups_count;
+
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
+ flexbg_flag = 1;
+
+ ext4_debug("Checking group descriptors");
+
+ for (i = 0; i < sbi->s_groups_count; i++) {
+ struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
+
+ if (i == sbi->s_groups_count - 1 || flexbg_flag)
+ last_block = ext4_blocks_count(sbi->s_es) - 1;
+ else
+ last_block = first_block +
+ (EXT4_BLOCKS_PER_GROUP(sb) - 1);
+
+ if ((grp == sbi->s_groups_count) &&
+ !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
+ grp = i;
+
+ block_bitmap = ext4_block_bitmap(sb, gdp);
+ if (block_bitmap < first_block || block_bitmap > last_block) {
+ ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
+ "Block bitmap for group %u not in group "
+ "(block %llu)!", i, block_bitmap);
+ return 0;
+ }
+ inode_bitmap = ext4_inode_bitmap(sb, gdp);
+ if (inode_bitmap < first_block || inode_bitmap > last_block) {
+ ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
+ "Inode bitmap for group %u not in group "
+ "(block %llu)!", i, inode_bitmap);
+ return 0;
+ }
+ inode_table = ext4_inode_table(sb, gdp);
+ if (inode_table < first_block ||
+ inode_table + sbi->s_itb_per_group - 1 > last_block) {
+ ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
+ "Inode table for group %u not in group "
+ "(block %llu)!", i, inode_table);
+ return 0;
+ }
+ ext4_lock_group(sb, i);
+ if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
+ ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
+ "Checksum for group %u failed (%u!=%u)",
+ i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
+ gdp)), le16_to_cpu(gdp->bg_checksum));
+ if (!(sb->s_flags & MS_RDONLY)) {
+ ext4_unlock_group(sb, i);
+ return 0;
+ }
+ }
+ ext4_unlock_group(sb, i);
+ if (!flexbg_flag)
+ first_block += EXT4_BLOCKS_PER_GROUP(sb);
+ }
+ if (NULL != first_not_zeroed)
+ *first_not_zeroed = grp;
+
+ ext4_free_blocks_count_set(sbi->s_es,
+ EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
+ sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
+ return 1;
+}
+
+/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
+ * the superblock) which were deleted from all directories, but held open by
+ * a process at the time of a crash. We walk the list and try to delete these
+ * inodes at recovery time (only with a read-write filesystem).
+ *
+ * In order to keep the orphan inode chain consistent during traversal (in
+ * case of crash during recovery), we link each inode into the superblock
+ * orphan list_head and handle it the same way as an inode deletion during
+ * normal operation (which journals the operations for us).
+ *
+ * We only do an iget() and an iput() on each inode, which is very safe if we
+ * accidentally point at an in-use or already deleted inode. The worst that
+ * can happen in this case is that we get a "bit already cleared" message from
+ * ext4_free_inode(). The only reason we would point at a wrong inode is if
+ * e2fsck was run on this filesystem, and it must have already done the orphan
+ * inode cleanup for us, so we can safely abort without any further action.
+ */
+static void ext4_orphan_cleanup(struct super_block *sb,
+ struct ext4_super_block *es)
+{
+ unsigned int s_flags = sb->s_flags;
+ int nr_orphans = 0, nr_truncates = 0;
+#ifdef CONFIG_QUOTA
+ int i;
+#endif
+ if (!es->s_last_orphan) {
+ jbd_debug(4, "no orphan inodes to clean up\n");
+ return;
+ }
+
+ if (bdev_read_only(sb->s_bdev)) {
+ ext4_msg(sb, KERN_ERR, "write access "
+ "unavailable, skipping orphan cleanup");
+ return;
+ }
+
+ /* Check if feature set would not allow a r/w mount */
+ if (!ext4_feature_set_ok(sb, 0)) {
+ ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
+ "unknown ROCOMPAT features");
+ return;
+ }
+
+ if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
+ if (es->s_last_orphan)
+ jbd_debug(1, "Errors on filesystem, "
+ "clearing orphan list.\n");
+ es->s_last_orphan = 0;
+ jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
+ return;
+ }
+
+ if (s_flags & MS_RDONLY) {
+ ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
+ sb->s_flags &= ~MS_RDONLY;
+ }
+#ifdef CONFIG_QUOTA
+ /* Needed for iput() to work correctly and not trash data */
+ sb->s_flags |= MS_ACTIVE;
+ /* Turn on quotas so that they are updated correctly */
+ for (i = 0; i < MAXQUOTAS; i++) {
+ if (EXT4_SB(sb)->s_qf_names[i]) {
+ int ret = ext4_quota_on_mount(sb, i);
+ if (ret < 0)
+ ext4_msg(sb, KERN_ERR,
+ "Cannot turn on journaled "
+ "quota: error %d", ret);
+ }
+ }
+#endif
+
+ while (es->s_last_orphan) {
+ struct inode *inode;
+
+ inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
+ if (IS_ERR(inode)) {
+ es->s_last_orphan = 0;
+ break;
+ }
+
+ list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
+ dquot_initialize(inode);
+ if (inode->i_nlink) {
+ ext4_msg(sb, KERN_DEBUG,
+ "%s: truncating inode %lu to %lld bytes",
+ __func__, inode->i_ino, inode->i_size);
+ jbd_debug(2, "truncating inode %lu to %lld bytes\n",
+ inode->i_ino, inode->i_size);
+ mutex_lock(&inode->i_mutex);
+ ext4_truncate(inode);
+ mutex_unlock(&inode->i_mutex);
+ nr_truncates++;
+ } else {
+ ext4_msg(sb, KERN_DEBUG,
+ "%s: deleting unreferenced inode %lu",
+ __func__, inode->i_ino);
+ jbd_debug(2, "deleting unreferenced inode %lu\n",
+ inode->i_ino);
+ nr_orphans++;
+ }
+ iput(inode); /* The delete magic happens here! */
+ }
+
+#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
+
+ if (nr_orphans)
+ ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
+ PLURAL(nr_orphans));
+ if (nr_truncates)
+ ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
+ PLURAL(nr_truncates));
+#ifdef CONFIG_QUOTA
+ /* Turn quotas off */
+ for (i = 0; i < MAXQUOTAS; i++) {
+ if (sb_dqopt(sb)->files[i])
+ dquot_quota_off(sb, i);
+ }
+#endif
+ sb->s_flags = s_flags; /* Restore MS_RDONLY status */
+}
+
+/*
+ * Maximal extent format file size.
+ * Resulting logical blkno at s_maxbytes must fit in our on-disk
+ * extent format containers, within a sector_t, and within i_blocks
+ * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
+ * so that won't be a limiting factor.
+ *
+ * However there is other limiting factor. We do store extents in the form
+ * of starting block and length, hence the resulting length of the extent
+ * covering maximum file size must fit into on-disk format containers as
+ * well. Given that length is always by 1 unit bigger than max unit (because
+ * we count 0 as well) we have to lower the s_maxbytes by one fs block.
+ *
+ * Note, this does *not* consider any metadata overhead for vfs i_blocks.
+ */
+static loff_t ext4_max_size(int blkbits, int has_huge_files)
+{
+ loff_t res;
+ loff_t upper_limit = MAX_LFS_FILESIZE;
+
+ /* small i_blocks in vfs inode? */
+ if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
+ /*
+ * CONFIG_LBDAF is not enabled implies the inode
+ * i_block represent total blocks in 512 bytes
+ * 32 == size of vfs inode i_blocks * 8
+ */
+ upper_limit = (1LL << 32) - 1;
+
+ /* total blocks in file system block size */
+ upper_limit >>= (blkbits - 9);
+ upper_limit <<= blkbits;
+ }
+
+ /*
+ * 32-bit extent-start container, ee_block. We lower the maxbytes
+ * by one fs block, so ee_len can cover the extent of maximum file
+ * size
+ */
+ res = (1LL << 32) - 1;
+ res <<= blkbits;
+
+ /* Sanity check against vm- & vfs- imposed limits */
+ if (res > upper_limit)
+ res = upper_limit;
+
+ return res;
+}
+
+/*
+ * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
+ * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
+ * We need to be 1 filesystem block less than the 2^48 sector limit.
+ */
+static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
+{
+ loff_t res = EXT4_NDIR_BLOCKS;
+ int meta_blocks;
+ loff_t upper_limit;
+ /* This is calculated to be the largest file size for a dense, block
+ * mapped file such that the file's total number of 512-byte sectors,
+ * including data and all indirect blocks, does not exceed (2^48 - 1).
+ *
+ * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
+ * number of 512-byte sectors of the file.
+ */
+
+ if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
+ /*
+ * !has_huge_files or CONFIG_LBDAF not enabled implies that
+ * the inode i_block field represents total file blocks in
+ * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
+ */
+ upper_limit = (1LL << 32) - 1;
+
+ /* total blocks in file system block size */
+ upper_limit >>= (bits - 9);
+
+ } else {
+ /*
+ * We use 48 bit ext4_inode i_blocks
+ * With EXT4_HUGE_FILE_FL set the i_blocks
+ * represent total number of blocks in
+ * file system block size
+ */
+ upper_limit = (1LL << 48) - 1;
+
+ }
+
+ /* indirect blocks */
+ meta_blocks = 1;
+ /* double indirect blocks */
+ meta_blocks += 1 + (1LL << (bits-2));
+ /* tripple indirect blocks */
+ meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
+
+ upper_limit -= meta_blocks;
+ upper_limit <<= bits;
+
+ res += 1LL << (bits-2);
+ res += 1LL << (2*(bits-2));
+ res += 1LL << (3*(bits-2));
+ res <<= bits;
+ if (res > upper_limit)
+ res = upper_limit;
+
+ if (res > MAX_LFS_FILESIZE)
+ res = MAX_LFS_FILESIZE;
+
+ return res;
+}
+
+static ext4_fsblk_t descriptor_loc(struct super_block *sb,
+ ext4_fsblk_t logical_sb_block, int nr)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ ext4_group_t bg, first_meta_bg;
+ int has_super = 0;
+
+ first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
+
+ if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
+ nr < first_meta_bg)
+ return logical_sb_block + nr + 1;
+ bg = sbi->s_desc_per_block * nr;
+ if (ext4_bg_has_super(sb, bg))
+ has_super = 1;
+
+ return (has_super + ext4_group_first_block_no(sb, bg));
+}
+
+/**
+ * ext4_get_stripe_size: Get the stripe size.
+ * @sbi: In memory super block info
+ *
+ * If we have specified it via mount option, then
+ * use the mount option value. If the value specified at mount time is
+ * greater than the blocks per group use the super block value.
+ * If the super block value is greater than blocks per group return 0.
+ * Allocator needs it be less than blocks per group.
+ *
+ */
+static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
+{
+ unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
+ unsigned long stripe_width =
+ le32_to_cpu(sbi->s_es->s_raid_stripe_width);
+ int ret;
+
+ if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
+ ret = sbi->s_stripe;
+ else if (stripe_width <= sbi->s_blocks_per_group)
+ ret = stripe_width;
+ else if (stride <= sbi->s_blocks_per_group)
+ ret = stride;
+ else
+ ret = 0;
+
+ /*
+ * If the stripe width is 1, this makes no sense and
+ * we set it to 0 to turn off stripe handling code.
+ */
+ if (ret <= 1)
+ ret = 0;
+
+ return ret;
+}
+
+/* sysfs supprt */
+
+struct ext4_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
+ ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
+ const char *, size_t);
+ int offset;
+};
+
+static int parse_strtoul(const char *buf,
+ unsigned long max, unsigned long *value)
+{
+ char *endp;
+
+ *value = simple_strtoul(skip_spaces(buf), &endp, 0);
+ endp = skip_spaces(endp);
+ if (*endp || *value > max)
+ return -EINVAL;
+
+ return 0;
+}
+
+static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
+ struct ext4_sb_info *sbi,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%llu\n",
+ (s64) EXT4_C2B(sbi,
+ percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
+}
+
+static ssize_t session_write_kbytes_show(struct ext4_attr *a,
+ struct ext4_sb_info *sbi, char *buf)
+{
+ struct super_block *sb = sbi->s_buddy_cache->i_sb;
+
+ if (!sb->s_bdev->bd_part)
+ return snprintf(buf, PAGE_SIZE, "0\n");
+ return snprintf(buf, PAGE_SIZE, "%lu\n",
+ (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
+ sbi->s_sectors_written_start) >> 1);
+}
+
+static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
+ struct ext4_sb_info *sbi, char *buf)
+{
+ struct super_block *sb = sbi->s_buddy_cache->i_sb;
+
+ if (!sb->s_bdev->bd_part)
+ return snprintf(buf, PAGE_SIZE, "0\n");
+ return snprintf(buf, PAGE_SIZE, "%llu\n",
+ (unsigned long long)(sbi->s_kbytes_written +
+ ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
+ EXT4_SB(sb)->s_sectors_written_start) >> 1)));
+}
+
+static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
+ struct ext4_sb_info *sbi,
+ const char *buf, size_t count)
+{
+ unsigned long t;
+
+ if (parse_strtoul(buf, 0x40000000, &t))
+ return -EINVAL;
+
+ if (t && !is_power_of_2(t))
+ return -EINVAL;
+
+ sbi->s_inode_readahead_blks = t;
+ return count;
+}
+
+static ssize_t sbi_ui_show(struct ext4_attr *a,
+ struct ext4_sb_info *sbi, char *buf)
+{
+ unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
+}
+
+static ssize_t sbi_ui_store(struct ext4_attr *a,
+ struct ext4_sb_info *sbi,
+ const char *buf, size_t count)
+{
+ unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
+ unsigned long t;
+
+ if (parse_strtoul(buf, 0xffffffff, &t))
+ return -EINVAL;
+ *ui = t;
+ return count;
+}
+
+#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
+static struct ext4_attr ext4_attr_##_name = { \
+ .attr = {.name = __stringify(_name), .mode = _mode }, \
+ .show = _show, \
+ .store = _store, \
+ .offset = offsetof(struct ext4_sb_info, _elname), \
+}
+#define EXT4_ATTR(name, mode, show, store) \
+static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
+
+#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
+#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
+#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
+#define EXT4_RW_ATTR_SBI_UI(name, elname) \
+ EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
+#define ATTR_LIST(name) &ext4_attr_##name.attr
+
+EXT4_RO_ATTR(delayed_allocation_blocks);
+EXT4_RO_ATTR(session_write_kbytes);
+EXT4_RO_ATTR(lifetime_write_kbytes);
+EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
+ inode_readahead_blks_store, s_inode_readahead_blks);
+EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
+EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
+EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
+EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
+EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
+EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
+EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
+EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
+
+static struct attribute *ext4_attrs[] = {
+ ATTR_LIST(delayed_allocation_blocks),
+ ATTR_LIST(session_write_kbytes),
+ ATTR_LIST(lifetime_write_kbytes),
+ ATTR_LIST(inode_readahead_blks),
+ ATTR_LIST(inode_goal),
+ ATTR_LIST(mb_stats),
+ ATTR_LIST(mb_max_to_scan),
+ ATTR_LIST(mb_min_to_scan),
+ ATTR_LIST(mb_order2_req),
+ ATTR_LIST(mb_stream_req),
+ ATTR_LIST(mb_group_prealloc),
+ ATTR_LIST(max_writeback_mb_bump),
+ NULL,
+};
+
+/* Features this copy of ext4 supports */
+EXT4_INFO_ATTR(lazy_itable_init);
+EXT4_INFO_ATTR(batched_discard);
+
+static struct attribute *ext4_feat_attrs[] = {
+ ATTR_LIST(lazy_itable_init),
+ ATTR_LIST(batched_discard),
+ NULL,
+};
+
+static ssize_t ext4_attr_show(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
+ s_kobj);
+ struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
+
+ return a->show ? a->show(a, sbi, buf) : 0;
+}
+
+static ssize_t ext4_attr_store(struct kobject *kobj,
+ struct attribute *attr,
+ const char *buf, size_t len)
+{
+ struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
+ s_kobj);
+ struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
+
+ return a->store ? a->store(a, sbi, buf, len) : 0;
+}
+
+static void ext4_sb_release(struct kobject *kobj)
+{
+ struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
+ s_kobj);
+ complete(&sbi->s_kobj_unregister);
+}
+
+static const struct sysfs_ops ext4_attr_ops = {
+ .show = ext4_attr_show,
+ .store = ext4_attr_store,
+};
+
+static struct kobj_type ext4_ktype = {
+ .default_attrs = ext4_attrs,
+ .sysfs_ops = &ext4_attr_ops,
+ .release = ext4_sb_release,
+};
+
+static void ext4_feat_release(struct kobject *kobj)
+{
+ complete(&ext4_feat->f_kobj_unregister);
+}
+
+static struct kobj_type ext4_feat_ktype = {
+ .default_attrs = ext4_feat_attrs,
+ .sysfs_ops = &ext4_attr_ops,
+ .release = ext4_feat_release,
+};
+
+/*
+ * Check whether this filesystem can be mounted based on
+ * the features present and the RDONLY/RDWR mount requested.
+ * Returns 1 if this filesystem can be mounted as requested,
+ * 0 if it cannot be.
+ */
+static int ext4_feature_set_ok(struct super_block *sb, int readonly)
+{
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
+ ext4_msg(sb, KERN_ERR,
+ "Couldn't mount because of "
+ "unsupported optional features (%x)",
+ (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
+ ~EXT4_FEATURE_INCOMPAT_SUPP));
+ return 0;
+ }
+
+ if (readonly)
+ return 1;
+
+ /* Check that feature set is OK for a read-write mount */
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
+ ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
+ "unsupported optional features (%x)",
+ (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
+ ~EXT4_FEATURE_RO_COMPAT_SUPP));
+ return 0;
+ }
+ /*
+ * Large file size enabled file system can only be mounted
+ * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
+ */
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
+ if (sizeof(blkcnt_t) < sizeof(u64)) {
+ ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
+ "cannot be mounted RDWR without "
+ "CONFIG_LBDAF");
+ return 0;
+ }
+ }
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
+ !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
+ ext4_msg(sb, KERN_ERR,
+ "Can't support bigalloc feature without "
+ "extents feature\n");
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * This function is called once a day if we have errors logged
+ * on the file system
+ */
+static void print_daily_error_info(unsigned long arg)
+{
+ struct super_block *sb = (struct super_block *) arg;
+ struct ext4_sb_info *sbi;
+ struct ext4_super_block *es;
+
+ sbi = EXT4_SB(sb);
+ es = sbi->s_es;
+
+ if (es->s_error_count)
+ /* fsck newer than v1.41.13 is needed to clean this condition. */
+ ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
+ le32_to_cpu(es->s_error_count));
+ if (es->s_first_error_time) {
+ printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
+ sb->s_id, le32_to_cpu(es->s_first_error_time),
+ (int) sizeof(es->s_first_error_func),
+ es->s_first_error_func,
+ le32_to_cpu(es->s_first_error_line));
+ if (es->s_first_error_ino)
+ printk(": inode %u",
+ le32_to_cpu(es->s_first_error_ino));
+ if (es->s_first_error_block)
+ printk(": block %llu", (unsigned long long)
+ le64_to_cpu(es->s_first_error_block));
+ printk("\n");
+ }
+ if (es->s_last_error_time) {
+ printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
+ sb->s_id, le32_to_cpu(es->s_last_error_time),
+ (int) sizeof(es->s_last_error_func),
+ es->s_last_error_func,
+ le32_to_cpu(es->s_last_error_line));
+ if (es->s_last_error_ino)
+ printk(": inode %u",
+ le32_to_cpu(es->s_last_error_ino));
+ if (es->s_last_error_block)
+ printk(": block %llu", (unsigned long long)
+ le64_to_cpu(es->s_last_error_block));
+ printk("\n");
+ }
+ mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
+}
+
+/* Find next suitable group and run ext4_init_inode_table */
+static int ext4_run_li_request(struct ext4_li_request *elr)
+{
+ struct ext4_group_desc *gdp = NULL;
+ ext4_group_t group, ngroups;
+ struct super_block *sb;
+ unsigned long timeout = 0;
+ int ret = 0;
+
+ sb = elr->lr_super;
+ ngroups = EXT4_SB(sb)->s_groups_count;
+
+ for (group = elr->lr_next_group; group < ngroups; group++) {
+ gdp = ext4_get_group_desc(sb, group, NULL);
+ if (!gdp) {
+ ret = 1;
+ break;
+ }
+
+ if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
+ break;
+ }
+
+ if (group == ngroups)
+ ret = 1;
+
+ if (!ret) {
+ timeout = jiffies;
+ ret = ext4_init_inode_table(sb, group,
+ elr->lr_timeout ? 0 : 1);
+ if (elr->lr_timeout == 0) {
+ timeout = (jiffies - timeout) *
+ elr->lr_sbi->s_li_wait_mult;
+ elr->lr_timeout = timeout;
+ }
+ elr->lr_next_sched = jiffies + elr->lr_timeout;
+ elr->lr_next_group = group + 1;
+ }
+
+ return ret;
+}
+
+/*
+ * Remove lr_request from the list_request and free the
+ * request structure. Should be called with li_list_mtx held
+ */
+static void ext4_remove_li_request(struct ext4_li_request *elr)
+{
+ struct ext4_sb_info *sbi;
+
+ if (!elr)
+ return;
+
+ sbi = elr->lr_sbi;
+
+ list_del(&elr->lr_request);
+ sbi->s_li_request = NULL;
+ kfree(elr);
+}
+
+static void ext4_unregister_li_request(struct super_block *sb)
+{
+ mutex_lock(&ext4_li_mtx);
+ if (!ext4_li_info) {
+ mutex_unlock(&ext4_li_mtx);
+ return;
+ }
+
+ mutex_lock(&ext4_li_info->li_list_mtx);
+ ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
+ mutex_unlock(&ext4_li_info->li_list_mtx);
+ mutex_unlock(&ext4_li_mtx);
+}
+
+static struct task_struct *ext4_lazyinit_task;
+
+/*
+ * This is the function where ext4lazyinit thread lives. It walks
+ * through the request list searching for next scheduled filesystem.
+ * When such a fs is found, run the lazy initialization request
+ * (ext4_rn_li_request) and keep track of the time spend in this
+ * function. Based on that time we compute next schedule time of
+ * the request. When walking through the list is complete, compute
+ * next waking time and put itself into sleep.
+ */
+static int ext4_lazyinit_thread(void *arg)
+{
+ struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
+ struct list_head *pos, *n;
+ struct ext4_li_request *elr;
+ unsigned long next_wakeup, cur;
+
+ BUG_ON(NULL == eli);
+
+cont_thread:
+ while (true) {
+ next_wakeup = MAX_JIFFY_OFFSET;
+
+ mutex_lock(&eli->li_list_mtx);
+ if (list_empty(&eli->li_request_list)) {
+ mutex_unlock(&eli->li_list_mtx);
+ goto exit_thread;
+ }
+
+ list_for_each_safe(pos, n, &eli->li_request_list) {
+ elr = list_entry(pos, struct ext4_li_request,
+ lr_request);
+
+ if (time_after_eq(jiffies, elr->lr_next_sched)) {
+ if (ext4_run_li_request(elr) != 0) {
+ /* error, remove the lazy_init job */
+ ext4_remove_li_request(elr);
+ continue;
+ }
+ }
+
+ if (time_before(elr->lr_next_sched, next_wakeup))
+ next_wakeup = elr->lr_next_sched;
+ }
+ mutex_unlock(&eli->li_list_mtx);
+
+ try_to_freeze();
+
+ cur = jiffies;
+ if ((time_after_eq(cur, next_wakeup)) ||
+ (MAX_JIFFY_OFFSET == next_wakeup)) {
+ cond_resched();
+ continue;
+ }
+
+ schedule_timeout_interruptible(next_wakeup - cur);
+
+ if (kthread_should_stop()) {
+ ext4_clear_request_list();
+ goto exit_thread;
+ }
+ }
+
+exit_thread:
+ /*
+ * It looks like the request list is empty, but we need
+ * to check it under the li_list_mtx lock, to prevent any
+ * additions into it, and of course we should lock ext4_li_mtx
+ * to atomically free the list and ext4_li_info, because at
+ * this point another ext4 filesystem could be registering
+ * new one.
+ */
+ mutex_lock(&ext4_li_mtx);
+ mutex_lock(&eli->li_list_mtx);
+ if (!list_empty(&eli->li_request_list)) {
+ mutex_unlock(&eli->li_list_mtx);
+ mutex_unlock(&ext4_li_mtx);
+ goto cont_thread;
+ }
+ mutex_unlock(&eli->li_list_mtx);
+ kfree(ext4_li_info);
+ ext4_li_info = NULL;
+ mutex_unlock(&ext4_li_mtx);
+
+ return 0;
+}
+
+static void ext4_clear_request_list(void)
+{
+ struct list_head *pos, *n;
+ struct ext4_li_request *elr;
+
+ mutex_lock(&ext4_li_info->li_list_mtx);
+ list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
+ elr = list_entry(pos, struct ext4_li_request,
+ lr_request);
+ ext4_remove_li_request(elr);
+ }
+ mutex_unlock(&ext4_li_info->li_list_mtx);
+}
+
+static int ext4_run_lazyinit_thread(void)
+{
+ ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
+ ext4_li_info, "ext4lazyinit");
+ if (IS_ERR(ext4_lazyinit_task)) {
+ int err = PTR_ERR(ext4_lazyinit_task);
+ ext4_clear_request_list();
+ kfree(ext4_li_info);
+ ext4_li_info = NULL;
+ printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
+ "initialization thread\n",
+ err);
+ return err;
+ }
+ ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
+ return 0;
+}
+
+/*
+ * Check whether it make sense to run itable init. thread or not.
+ * If there is at least one uninitialized inode table, return
+ * corresponding group number, else the loop goes through all
+ * groups and return total number of groups.
+ */
+static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
+{
+ ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
+ struct ext4_group_desc *gdp = NULL;
+
+ for (group = 0; group < ngroups; group++) {
+ gdp = ext4_get_group_desc(sb, group, NULL);
+ if (!gdp)
+ continue;
+
+ if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
+ break;
+ }
+
+ return group;
+}
+
+static int ext4_li_info_new(void)
+{
+ struct ext4_lazy_init *eli = NULL;
+
+ eli = kzalloc(sizeof(*eli), GFP_KERNEL);
+ if (!eli)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&eli->li_request_list);
+ mutex_init(&eli->li_list_mtx);
+
+ eli->li_state |= EXT4_LAZYINIT_QUIT;
+
+ ext4_li_info = eli;
+
+ return 0;
+}
+
+static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
+ ext4_group_t start)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_li_request *elr;
+ unsigned long rnd;
+
+ elr = kzalloc(sizeof(*elr), GFP_KERNEL);
+ if (!elr)
+ return NULL;
+
+ elr->lr_super = sb;
+ elr->lr_sbi = sbi;
+ elr->lr_next_group = start;
+
+ /*
+ * Randomize first schedule time of the request to
+ * spread the inode table initialization requests
+ * better.
+ */
+ get_random_bytes(&rnd, sizeof(rnd));
+ elr->lr_next_sched = jiffies + (unsigned long)rnd %
+ (EXT4_DEF_LI_MAX_START_DELAY * HZ);
+
+ return elr;
+}
+
+static int ext4_register_li_request(struct super_block *sb,
+ ext4_group_t first_not_zeroed)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_li_request *elr;
+ ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
+ int ret = 0;
+
+ if (sbi->s_li_request != NULL) {
+ /*
+ * Reset timeout so it can be computed again, because
+ * s_li_wait_mult might have changed.
+ */
+ sbi->s_li_request->lr_timeout = 0;
+ return 0;
+ }
+
+ if (first_not_zeroed == ngroups ||
+ (sb->s_flags & MS_RDONLY) ||
+ !test_opt(sb, INIT_INODE_TABLE))
+ return 0;
+
+ elr = ext4_li_request_new(sb, first_not_zeroed);
+ if (!elr)
+ return -ENOMEM;
+
+ mutex_lock(&ext4_li_mtx);
+
+ if (NULL == ext4_li_info) {
+ ret = ext4_li_info_new();
+ if (ret)
+ goto out;
+ }
+
+ mutex_lock(&ext4_li_info->li_list_mtx);
+ list_add(&elr->lr_request, &ext4_li_info->li_request_list);
+ mutex_unlock(&ext4_li_info->li_list_mtx);
+
+ sbi->s_li_request = elr;
+ /*
+ * set elr to NULL here since it has been inserted to
+ * the request_list and the removal and free of it is
+ * handled by ext4_clear_request_list from now on.
+ */
+ elr = NULL;
+
+ if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
+ ret = ext4_run_lazyinit_thread();
+ if (ret)
+ goto out;
+ }
+out:
+ mutex_unlock(&ext4_li_mtx);
+ if (ret)
+ kfree(elr);
+ return ret;
+}
+
+/*
+ * We do not need to lock anything since this is called on
+ * module unload.
+ */
+static void ext4_destroy_lazyinit_thread(void)
+{
+ /*
+ * If thread exited earlier
+ * there's nothing to be done.
+ */
+ if (!ext4_li_info || !ext4_lazyinit_task)
+ return;
+
+ kthread_stop(ext4_lazyinit_task);
+}
+
+/*
+ * Note: calculating the overhead so we can be compatible with
+ * historical BSD practice is quite difficult in the face of
+ * clusters/bigalloc. This is because multiple metadata blocks from
+ * different block group can end up in the same allocation cluster.
+ * Calculating the exact overhead in the face of clustered allocation
+ * requires either O(all block bitmaps) in memory or O(number of block
+ * groups**2) in time. We will still calculate the superblock for
+ * older file systems --- and if we come across with a bigalloc file
+ * system with zero in s_overhead_clusters the estimate will be close to
+ * correct especially for very large cluster sizes --- but for newer
+ * file systems, it's better to calculate this figure once at mkfs
+ * time, and store it in the superblock. If the superblock value is
+ * present (even for non-bigalloc file systems), we will use it.
+ */
+static int count_overhead(struct super_block *sb, ext4_group_t grp,
+ char *buf)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_group_desc *gdp;
+ ext4_fsblk_t first_block, last_block, b;
+ ext4_group_t i, ngroups = ext4_get_groups_count(sb);
+ int s, j, count = 0;
+
+ if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
+ return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
+ sbi->s_itb_per_group + 2);
+
+ first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
+ (grp * EXT4_BLOCKS_PER_GROUP(sb));
+ last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
+ for (i = 0; i < ngroups; i++) {
+ gdp = ext4_get_group_desc(sb, i, NULL);
+ b = ext4_block_bitmap(sb, gdp);
+ if (b >= first_block && b <= last_block) {
+ ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
+ count++;
+ }
+ b = ext4_inode_bitmap(sb, gdp);
+ if (b >= first_block && b <= last_block) {
+ ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
+ count++;
+ }
+ b = ext4_inode_table(sb, gdp);
+ if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
+ for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
+ int c = EXT4_B2C(sbi, b - first_block);
+ ext4_set_bit(c, buf);
+ count++;
+ }
+ if (i != grp)
+ continue;
+ s = 0;
+ if (ext4_bg_has_super(sb, grp)) {
+ ext4_set_bit(s++, buf);
+ count++;
+ }
+ for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
+ ext4_set_bit(EXT4_B2C(sbi, s++), buf);
+ count++;
+ }
+ }
+ if (!count)
+ return 0;
+ return EXT4_CLUSTERS_PER_GROUP(sb) -
+ ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
+}
+
+/*
+ * Compute the overhead and stash it in sbi->s_overhead
+ */
+int ext4_calculate_overhead(struct super_block *sb)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_super_block *es = sbi->s_es;
+ ext4_group_t i, ngroups = ext4_get_groups_count(sb);
+ ext4_fsblk_t overhead = 0;
+ char *buf = (char *) get_zeroed_page(GFP_KERNEL);
+
+ memset(buf, 0, PAGE_SIZE);
+ if (!buf)
+ return -ENOMEM;
+
+ /*
+ * Compute the overhead (FS structures). This is constant
+ * for a given filesystem unless the number of block groups
+ * changes so we cache the previous value until it does.
+ */
+
+ /*
+ * All of the blocks before first_data_block are overhead
+ */
+ overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
+
+ /*
+ * Add the overhead found in each block group
+ */
+ for (i = 0; i < ngroups; i++) {
+ int blks;
+
+ blks = count_overhead(sb, i, buf);
+ overhead += blks;
+ if (blks)
+ memset(buf, 0, PAGE_SIZE);
+ cond_resched();
+ }
+ sbi->s_overhead = overhead;
+ smp_wmb();
+ free_page((unsigned long) buf);
+ return 0;
+}
+
+static int ext4_fill_super(struct super_block *sb, void *data, int silent)
+{
+ char *orig_data = kstrdup(data, GFP_KERNEL);
+ struct buffer_head *bh;
+ struct ext4_super_block *es = NULL;
+ struct ext4_sb_info *sbi;
+ ext4_fsblk_t block;
+ ext4_fsblk_t sb_block = get_sb_block(&data);
+ ext4_fsblk_t logical_sb_block;
+ unsigned long offset = 0;
+ unsigned long journal_devnum = 0;
+ unsigned long def_mount_opts;
+ struct inode *root;
+ char *cp;
+ const char *descr;
+ int ret = -ENOMEM;
+ int blocksize, clustersize;
+ unsigned int db_count;
+ unsigned int i;
+ int needs_recovery, has_huge_files, has_bigalloc;
+ __u64 blocks_count;
+ int err;
+ unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
+ ext4_group_t first_not_zeroed;
+
+ sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
+ if (!sbi)
+ goto out_free_orig;
+
+ sbi->s_blockgroup_lock =
+ kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
+ if (!sbi->s_blockgroup_lock) {
+ kfree(sbi);
+ goto out_free_orig;
+ }
+ sb->s_fs_info = sbi;
+ sbi->s_mount_opt = 0;
+ sbi->s_resuid = EXT4_DEF_RESUID;
+ sbi->s_resgid = EXT4_DEF_RESGID;
+ sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
+ sbi->s_sb_block = sb_block;
+ if (sb->s_bdev->bd_part)
+ sbi->s_sectors_written_start =
+ part_stat_read(sb->s_bdev->bd_part, sectors[1]);
+
+ /* Cleanup superblock name */
+ for (cp = sb->s_id; (cp = strchr(cp, '/'));)
+ *cp = '!';
+
+ ret = -EINVAL;
+ blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
+ if (!blocksize) {
+ ext4_msg(sb, KERN_ERR, "unable to set blocksize");
+ goto out_fail;
+ }
+
+ /*
+ * The ext4 superblock will not be buffer aligned for other than 1kB
+ * block sizes. We need to calculate the offset from buffer start.
+ */
+ if (blocksize != EXT4_MIN_BLOCK_SIZE) {
+ logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
+ offset = do_div(logical_sb_block, blocksize);
+ } else {
+ logical_sb_block = sb_block;
+ }
+
+ if (!(bh = sb_bread(sb, logical_sb_block))) {
+ ext4_msg(sb, KERN_ERR, "unable to read superblock");
+ goto out_fail;
+ }
+ /*
+ * Note: s_es must be initialized as soon as possible because
+ * some ext4 macro-instructions depend on its value
+ */
+ es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
+ sbi->s_es = es;
+ sb->s_magic = le16_to_cpu(es->s_magic);
+ if (sb->s_magic != EXT4_SUPER_MAGIC)
+ goto cantfind_ext4;
+ sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
+
+ /* Set defaults before we parse the mount options */
+ def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
+ set_opt(sb, INIT_INODE_TABLE);
+ if (def_mount_opts & EXT4_DEFM_DEBUG)
+ set_opt(sb, DEBUG);
+ if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
+ set_opt(sb, GRPID);
+ if (def_mount_opts & EXT4_DEFM_UID16)
+ set_opt(sb, NO_UID32);
+ /* xattr user namespace & acls are now defaulted on */
+#ifdef CONFIG_EXT4_FS_XATTR
+ set_opt(sb, XATTR_USER);
+#endif
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
+ set_opt(sb, POSIX_ACL);
+#endif
+ set_opt(sb, MBLK_IO_SUBMIT);
+ if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
+ set_opt(sb, JOURNAL_DATA);
+ else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
+ set_opt(sb, ORDERED_DATA);
+ else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
+ set_opt(sb, WRITEBACK_DATA);
+
+ if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
+ set_opt(sb, ERRORS_PANIC);
+ else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
+ set_opt(sb, ERRORS_CONT);
+ else
+ set_opt(sb, ERRORS_RO);
+ if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
+ set_opt(sb, BLOCK_VALIDITY);
+ if (def_mount_opts & EXT4_DEFM_DISCARD)
+ set_opt(sb, DISCARD);
+
+ sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
+ sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
+ sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
+ sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
+ sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
+
+ if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
+ set_opt(sb, BARRIER);
+
+ /*
+ * enable delayed allocation by default
+ * Use -o nodelalloc to turn it off
+ */
+ if (!IS_EXT3_SB(sb) &&
+ ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
+ set_opt(sb, DELALLOC);
+
+ /*
+ * set default s_li_wait_mult for lazyinit, for the case there is
+ * no mount option specified.
+ */
+ sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
+
+ if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
+ &journal_devnum, &journal_ioprio, 0)) {
+ ext4_msg(sb, KERN_WARNING,
+ "failed to parse options in superblock: %s",
+ sbi->s_es->s_mount_opts);
+ }
+ sbi->s_def_mount_opt = sbi->s_mount_opt;
+ if (!parse_options((char *) data, sb, &journal_devnum,
+ &journal_ioprio, 0))
+ goto failed_mount;
+
+ if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
+ printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
+ "with data=journal disables delayed "
+ "allocation and O_DIRECT support!\n");
+ if (test_opt2(sb, EXPLICIT_DELALLOC)) {
+ ext4_msg(sb, KERN_ERR, "can't mount with "
+ "both data=journal and delalloc");
+ goto failed_mount;
+ }
+ if (test_opt(sb, DIOREAD_NOLOCK)) {
+ ext4_msg(sb, KERN_ERR, "can't mount with "
+ "both data=journal and dioread_nolock");
+ goto failed_mount;
+ }
+ if (test_opt(sb, DELALLOC))
+ clear_opt(sb, DELALLOC);
+ }
+
+ sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
+ (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
+
+ if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
+ (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
+ EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
+ EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
+ ext4_msg(sb, KERN_WARNING,
+ "feature flags set on rev 0 fs, "
+ "running e2fsck is recommended");
+
+ if (IS_EXT2_SB(sb)) {
+ if (ext2_feature_set_ok(sb))
+ ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
+ "using the ext4 subsystem");
+ else {
+ ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
+ "to feature incompatibilities");
+ goto failed_mount;
+ }
+ }
+
+ if (IS_EXT3_SB(sb)) {
+ if (ext3_feature_set_ok(sb))
+ ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
+ "using the ext4 subsystem");
+ else {
+ ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
+ "to feature incompatibilities");
+ goto failed_mount;
+ }
+ }
+
+ /*
+ * Check feature flags regardless of the revision level, since we
+ * previously didn't change the revision level when setting the flags,
+ * so there is a chance incompat flags are set on a rev 0 filesystem.
+ */
+ if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
+ goto failed_mount;
+
+ blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
+ if (blocksize < EXT4_MIN_BLOCK_SIZE ||
+ blocksize > EXT4_MAX_BLOCK_SIZE) {
+ ext4_msg(sb, KERN_ERR,
+ "Unsupported filesystem blocksize %d", blocksize);
+ goto failed_mount;
+ }
+
+ if (sb->s_blocksize != blocksize) {
+ /* Validate the filesystem blocksize */
+ if (!sb_set_blocksize(sb, blocksize)) {
+ ext4_msg(sb, KERN_ERR, "bad block size %d",
+ blocksize);
+ goto failed_mount;
+ }
+
+ brelse(bh);
+ logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
+ offset = do_div(logical_sb_block, blocksize);
+ bh = sb_bread(sb, logical_sb_block);
+ if (!bh) {
+ ext4_msg(sb, KERN_ERR,
+ "Can't read superblock on 2nd try");
+ goto failed_mount;
+ }
+ es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
+ sbi->s_es = es;
+ if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
+ ext4_msg(sb, KERN_ERR,
+ "Magic mismatch, very weird!");
+ goto failed_mount;
+ }
+ }
+
+ has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
+ EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
+ sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
+ has_huge_files);
+ sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
+
+ if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
+ sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
+ sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
+ } else {
+ sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
+ sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
+ if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
+ (!is_power_of_2(sbi->s_inode_size)) ||
+ (sbi->s_inode_size > blocksize)) {
+ ext4_msg(sb, KERN_ERR,
+ "unsupported inode size: %d",
+ sbi->s_inode_size);
+ goto failed_mount;
+ }
+ if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
+ sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
+ }
+
+ sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
+ if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
+ sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
+ !is_power_of_2(sbi->s_desc_size)) {
+ ext4_msg(sb, KERN_ERR,
+ "unsupported descriptor size %lu",
+ sbi->s_desc_size);
+ goto failed_mount;
+ }
+ } else
+ sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
+
+ sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
+ sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
+ if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
+ goto cantfind_ext4;
+
+ sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
+ if (sbi->s_inodes_per_block == 0)
+ goto cantfind_ext4;
+ sbi->s_itb_per_group = sbi->s_inodes_per_group /
+ sbi->s_inodes_per_block;
+ sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
+ sbi->s_sbh = bh;
+ sbi->s_mount_state = le16_to_cpu(es->s_state);
+ sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
+ sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
+
+ for (i = 0; i < 4; i++)
+ sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
+ sbi->s_def_hash_version = es->s_def_hash_version;
+ if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
+ i = le32_to_cpu(es->s_flags);
+ if (i & EXT2_FLAGS_UNSIGNED_HASH)
+ sbi->s_hash_unsigned = 3;
+ else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
+#ifdef __CHAR_UNSIGNED__
+ if (!(sb->s_flags & MS_RDONLY))
+ es->s_flags |=
+ cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
+ sbi->s_hash_unsigned = 3;
+#else
+ if (!(sb->s_flags & MS_RDONLY))
+ es->s_flags |=
+ cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
+#endif
+ }
+ }
+
+ /* Handle clustersize */
+ clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
+ has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
+ EXT4_FEATURE_RO_COMPAT_BIGALLOC);
+ if (has_bigalloc) {
+ if (clustersize < blocksize) {
+ ext4_msg(sb, KERN_ERR,
+ "cluster size (%d) smaller than "
+ "block size (%d)", clustersize, blocksize);
+ goto failed_mount;
+ }
+ sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
+ le32_to_cpu(es->s_log_block_size);
+ sbi->s_clusters_per_group =
+ le32_to_cpu(es->s_clusters_per_group);
+ if (sbi->s_clusters_per_group > blocksize * 8) {
+ ext4_msg(sb, KERN_ERR,
+ "#clusters per group too big: %lu",
+ sbi->s_clusters_per_group);
+ goto failed_mount;
+ }
+ if (sbi->s_blocks_per_group !=
+ (sbi->s_clusters_per_group * (clustersize / blocksize))) {
+ ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
+ "clusters per group (%lu) inconsistent",
+ sbi->s_blocks_per_group,
+ sbi->s_clusters_per_group);
+ goto failed_mount;
+ }
+ } else {
+ if (clustersize != blocksize) {
+ ext4_warning(sb, "fragment/cluster size (%d) != "
+ "block size (%d)", clustersize,
+ blocksize);
+ clustersize = blocksize;
+ }
+ if (sbi->s_blocks_per_group > blocksize * 8) {
+ ext4_msg(sb, KERN_ERR,
+ "#blocks per group too big: %lu",
+ sbi->s_blocks_per_group);
+ goto failed_mount;
+ }
+ sbi->s_clusters_per_group = sbi->s_blocks_per_group;
+ sbi->s_cluster_bits = 0;
+ }
+ sbi->s_cluster_ratio = clustersize / blocksize;
+
+ if (sbi->s_inodes_per_group > blocksize * 8) {
+ ext4_msg(sb, KERN_ERR,
+ "#inodes per group too big: %lu",
+ sbi->s_inodes_per_group);
+ goto failed_mount;
+ }
+
+ /*
+ * Test whether we have more sectors than will fit in sector_t,
+ * and whether the max offset is addressable by the page cache.
+ */
+ err = generic_check_addressable(sb->s_blocksize_bits,
+ ext4_blocks_count(es));
+ if (err) {
+ ext4_msg(sb, KERN_ERR, "filesystem"
+ " too large to mount safely on this system");
+ if (sizeof(sector_t) < 8)
+ ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
+ ret = err;
+ goto failed_mount;
+ }
+
+ if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
+ goto cantfind_ext4;
+
+ /* check blocks count against device size */
+ blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
+ if (blocks_count && ext4_blocks_count(es) > blocks_count) {
+ ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
+ "exceeds size of device (%llu blocks)",
+ ext4_blocks_count(es), blocks_count);
+ goto failed_mount;
+ }
+
+ /*
+ * It makes no sense for the first data block to be beyond the end
+ * of the filesystem.
+ */
+ if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
+ ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
+ "block %u is beyond end of filesystem (%llu)",
+ le32_to_cpu(es->s_first_data_block),
+ ext4_blocks_count(es));
+ goto failed_mount;
+ }
+ blocks_count = (ext4_blocks_count(es) -
+ le32_to_cpu(es->s_first_data_block) +
+ EXT4_BLOCKS_PER_GROUP(sb) - 1);
+ do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
+ if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
+ ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
+ "(block count %llu, first data block %u, "
+ "blocks per group %lu)", sbi->s_groups_count,
+ ext4_blocks_count(es),
+ le32_to_cpu(es->s_first_data_block),
+ EXT4_BLOCKS_PER_GROUP(sb));
+ goto failed_mount;
+ }
+ sbi->s_groups_count = blocks_count;
+ sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
+ (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
+ db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
+ EXT4_DESC_PER_BLOCK(sb);
+ sbi->s_group_desc = ext4_kvmalloc(db_count *
+ sizeof(struct buffer_head *),
+ GFP_KERNEL);
+ if (sbi->s_group_desc == NULL) {
+ ext4_msg(sb, KERN_ERR, "not enough memory");
+ goto failed_mount;
+ }
+
+ if (ext4_proc_root)
+ sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
+
+ if (sbi->s_proc)
+ proc_create_data("options", S_IRUGO, sbi->s_proc,
+ &ext4_seq_options_fops, sb);
+
+ bgl_lock_init(sbi->s_blockgroup_lock);
+
+ for (i = 0; i < db_count; i++) {
+ block = descriptor_loc(sb, logical_sb_block, i);
+ sbi->s_group_desc[i] = sb_bread(sb, block);
+ if (!sbi->s_group_desc[i]) {
+ ext4_msg(sb, KERN_ERR,
+ "can't read group descriptor %d", i);
+ db_count = i;
+ goto failed_mount2;
+ }
+ }
+ if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
+ ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
+ goto failed_mount2;
+ }
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
+ if (!ext4_fill_flex_info(sb)) {
+ ext4_msg(sb, KERN_ERR,
+ "unable to initialize "
+ "flex_bg meta info!");
+ goto failed_mount2;
+ }
+
+ sbi->s_gdb_count = db_count;
+ get_random_bytes(&sbi->s_next_generation, sizeof(u32));
+ spin_lock_init(&sbi->s_next_gen_lock);
+
+ init_timer(&sbi->s_err_report);
+ sbi->s_err_report.function = print_daily_error_info;
+ sbi->s_err_report.data = (unsigned long) sb;
+
+ err = percpu_counter_init(&sbi->s_freeclusters_counter,
+ ext4_count_free_clusters(sb));
+ if (!err) {
+ err = percpu_counter_init(&sbi->s_freeinodes_counter,
+ ext4_count_free_inodes(sb));
+ }
+ if (!err) {
+ err = percpu_counter_init(&sbi->s_dirs_counter,
+ ext4_count_dirs(sb));
+ }
+ if (!err) {
+ err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
+ }
+ if (err) {
+ ext4_msg(sb, KERN_ERR, "insufficient memory");
+ goto failed_mount3;
+ }
+
+ sbi->s_stripe = ext4_get_stripe_size(sbi);
+ sbi->s_max_writeback_mb_bump = 128;
+
+ /*
+ * set up enough so that it can read an inode
+ */
+ if (!test_opt(sb, NOLOAD) &&
+ EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
+ sb->s_op = &ext4_sops;
+ else
+ sb->s_op = &ext4_nojournal_sops;
+ sb->s_export_op = &ext4_export_ops;
+ sb->s_xattr = ext4_xattr_handlers;
+#ifdef CONFIG_QUOTA
+ sb->s_qcop = &ext4_qctl_operations;
+ sb->dq_op = &ext4_quota_operations;
+#endif
+ memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
+
+ INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
+ mutex_init(&sbi->s_orphan_lock);
+ sbi->s_resize_flags = 0;
+
+ sb->s_root = NULL;
+
+ needs_recovery = (es->s_last_orphan != 0 ||
+ EXT4_HAS_INCOMPAT_FEATURE(sb,
+ EXT4_FEATURE_INCOMPAT_RECOVER));
+
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
+ !(sb->s_flags & MS_RDONLY))
+ if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
+ goto failed_mount3;
+
+ /*
+ * The first inode we look at is the journal inode. Don't try
+ * root first: it may be modified in the journal!
+ */
+ if (!test_opt(sb, NOLOAD) &&
+ EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
+ if (ext4_load_journal(sb, es, journal_devnum))
+ goto failed_mount3;
+ } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
+ EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
+ ext4_msg(sb, KERN_ERR, "required journal recovery "
+ "suppressed and not mounted read-only");
+ goto failed_mount_wq;
+ } else {
+ clear_opt(sb, DATA_FLAGS);
+ sbi->s_journal = NULL;
+ needs_recovery = 0;
+ goto no_journal;
+ }
+
+ if (ext4_blocks_count(es) > 0xffffffffULL &&
+ !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
+ JBD2_FEATURE_INCOMPAT_64BIT)) {
+ ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
+ goto failed_mount_wq;
+ }
+
+ if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
+ jbd2_journal_set_features(sbi->s_journal,
+ JBD2_FEATURE_COMPAT_CHECKSUM, 0,
+ JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
+ } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
+ jbd2_journal_set_features(sbi->s_journal,
+ JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
+ jbd2_journal_clear_features(sbi->s_journal, 0, 0,
+ JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
+ } else {
+ jbd2_journal_clear_features(sbi->s_journal,
+ JBD2_FEATURE_COMPAT_CHECKSUM, 0,
+ JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
+ }
+
+ /* We have now updated the journal if required, so we can
+ * validate the data journaling mode. */
+ switch (test_opt(sb, DATA_FLAGS)) {
+ case 0:
+ /* No mode set, assume a default based on the journal
+ * capabilities: ORDERED_DATA if the journal can
+ * cope, else JOURNAL_DATA
+ */
+ if (jbd2_journal_check_available_features
+ (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
+ set_opt(sb, ORDERED_DATA);
+ else
+ set_opt(sb, JOURNAL_DATA);
+ break;
+
+ case EXT4_MOUNT_ORDERED_DATA:
+ case EXT4_MOUNT_WRITEBACK_DATA:
+ if (!jbd2_journal_check_available_features
+ (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
+ ext4_msg(sb, KERN_ERR, "Journal does not support "
+ "requested data journaling mode");
+ goto failed_mount_wq;
+ }
+ default:
+ break;
+ }
+ set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
+
+ sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
+
+ /*
+ * The journal may have updated the bg summary counts, so we
+ * need to update the global counters.
+ */
+ percpu_counter_set(&sbi->s_freeclusters_counter,
+ ext4_count_free_clusters(sb));
+ percpu_counter_set(&sbi->s_freeinodes_counter,
+ ext4_count_free_inodes(sb));
+ percpu_counter_set(&sbi->s_dirs_counter,
+ ext4_count_dirs(sb));
+ percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
+
+no_journal:
+ /*
+ * Get the # of file system overhead blocks from the
+ * superblock if present.
+ */
+ if (es->s_overhead_clusters)
+ sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
+ else {
+ ret = ext4_calculate_overhead(sb);
+ if (ret)
+ goto failed_mount_wq;
+ }
+
+ /*
+ * The maximum number of concurrent works can be high and
+ * concurrency isn't really necessary. Limit it to 1.
+ */
+ EXT4_SB(sb)->dio_unwritten_wq =
+ alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
+ if (!EXT4_SB(sb)->dio_unwritten_wq) {
+ printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
+ goto failed_mount_wq;
+ }
+
+ /*
+ * The jbd2_journal_load will have done any necessary log recovery,
+ * so we can safely mount the rest of the filesystem now.
+ */
+
+ root = ext4_iget(sb, EXT4_ROOT_INO);
+ if (IS_ERR(root)) {
+ ext4_msg(sb, KERN_ERR, "get root inode failed");
+ ret = PTR_ERR(root);
+ root = NULL;
+ goto failed_mount4;
+ }
+ if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
+ ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
+ iput(root);
+ goto failed_mount4;
+ }
+ sb->s_root = d_make_root(root);
+ if (!sb->s_root) {
+ ext4_msg(sb, KERN_ERR, "get root dentry failed");
+ ret = -ENOMEM;
+ goto failed_mount4;
+ }
+
+ if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
+ sb->s_flags |= MS_RDONLY;
+
+ /* determine the minimum size of new large inodes, if present */
+ if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
+ sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
+ EXT4_GOOD_OLD_INODE_SIZE;
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
+ EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
+ if (sbi->s_want_extra_isize <
+ le16_to_cpu(es->s_want_extra_isize))
+ sbi->s_want_extra_isize =
+ le16_to_cpu(es->s_want_extra_isize);
+ if (sbi->s_want_extra_isize <
+ le16_to_cpu(es->s_min_extra_isize))
+ sbi->s_want_extra_isize =
+ le16_to_cpu(es->s_min_extra_isize);
+ }
+ }
+ /* Check if enough inode space is available */
+ if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
+ sbi->s_inode_size) {
+ sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
+ EXT4_GOOD_OLD_INODE_SIZE;
+ ext4_msg(sb, KERN_INFO, "required extra inode space not"
+ "available");
+ }
+
+ err = ext4_setup_system_zone(sb);
+ if (err) {
+ ext4_msg(sb, KERN_ERR, "failed to initialize system "
+ "zone (%d)", err);
+ goto failed_mount4a;
+ }
+
+ ext4_ext_init(sb);
+ err = ext4_mb_init(sb, needs_recovery);
+ if (err) {
+ ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
+ err);
+ goto failed_mount5;
+ }
+
+ err = ext4_register_li_request(sb, first_not_zeroed);
+ if (err)
+ goto failed_mount6;
+
+ sbi->s_kobj.kset = ext4_kset;
+ init_completion(&sbi->s_kobj_unregister);
+ err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
+ "%s", sb->s_id);
+ if (err)
+ goto failed_mount7;
+
+ EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
+ ext4_orphan_cleanup(sb, es);
+ EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
+ if (needs_recovery) {
+ ext4_msg(sb, KERN_INFO, "recovery complete");
+ ext4_mark_recovery_complete(sb, es);
+ }
+ if (EXT4_SB(sb)->s_journal) {
+ if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
+ descr = " journalled data mode";
+ else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
+ descr = " ordered data mode";
+ else
+ descr = " writeback data mode";
+ } else
+ descr = "out journal";
+
+ ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
+ "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
+ *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
+
+ if (es->s_error_count)
+ mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
+
+ kfree(orig_data);
+ return 0;
+
+cantfind_ext4:
+ if (!silent)
+ ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
+ goto failed_mount;
+
+failed_mount7:
+ ext4_unregister_li_request(sb);
+failed_mount6:
+ ext4_mb_release(sb);
+failed_mount5:
+ ext4_ext_release(sb);
+ ext4_release_system_zone(sb);
+failed_mount4a:
+ dput(sb->s_root);
+ sb->s_root = NULL;
+failed_mount4:
+ ext4_msg(sb, KERN_ERR, "mount failed");
+ destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
+failed_mount_wq:
+ if (sbi->s_journal) {
+ jbd2_journal_destroy(sbi->s_journal);
+ sbi->s_journal = NULL;
+ }
+failed_mount3:
+ del_timer(&sbi->s_err_report);
+ if (sbi->s_flex_groups)
+ ext4_kvfree(sbi->s_flex_groups);
+ percpu_counter_destroy(&sbi->s_freeclusters_counter);
+ percpu_counter_destroy(&sbi->s_freeinodes_counter);
+ percpu_counter_destroy(&sbi->s_dirs_counter);
+ percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
+ if (sbi->s_mmp_tsk)
+ kthread_stop(sbi->s_mmp_tsk);
+failed_mount2:
+ for (i = 0; i < db_count; i++)
+ brelse(sbi->s_group_desc[i]);
+ ext4_kvfree(sbi->s_group_desc);
+failed_mount:
+ if (sbi->s_proc) {
+ remove_proc_entry("options", sbi->s_proc);
+ remove_proc_entry(sb->s_id, ext4_proc_root);
+ }
+#ifdef CONFIG_QUOTA
+ for (i = 0; i < MAXQUOTAS; i++)
+ kfree(sbi->s_qf_names[i]);
+#endif
+ ext4_blkdev_remove(sbi);
+ brelse(bh);
+out_fail:
+ sb->s_fs_info = NULL;
+ kfree(sbi->s_blockgroup_lock);
+ kfree(sbi);
+out_free_orig:
+ kfree(orig_data);
+ return ret;
+}
+
+/*
+ * Setup any per-fs journal parameters now. We'll do this both on
+ * initial mount, once the journal has been initialised but before we've
+ * done any recovery; and again on any subsequent remount.
+ */
+static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+
+ journal->j_commit_interval = sbi->s_commit_interval;
+ journal->j_min_batch_time = sbi->s_min_batch_time;
+ journal->j_max_batch_time = sbi->s_max_batch_time;
+
+ write_lock(&journal->j_state_lock);
+ if (test_opt(sb, BARRIER))
+ journal->j_flags |= JBD2_BARRIER;
+ else
+ journal->j_flags &= ~JBD2_BARRIER;
+ if (test_opt(sb, DATA_ERR_ABORT))
+ journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
+ else
+ journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
+ write_unlock(&journal->j_state_lock);
+}
+
+static journal_t *ext4_get_journal(struct super_block *sb,
+ unsigned int journal_inum)
+{
+ struct inode *journal_inode;
+ journal_t *journal;
+
+ BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
+
+ /* First, test for the existence of a valid inode on disk. Bad
+ * things happen if we iget() an unused inode, as the subsequent
+ * iput() will try to delete it. */
+
+ journal_inode = ext4_iget(sb, journal_inum);
+ if (IS_ERR(journal_inode)) {
+ ext4_msg(sb, KERN_ERR, "no journal found");
+ return NULL;
+ }
+ if (!journal_inode->i_nlink) {
+ make_bad_inode(journal_inode);
+ iput(journal_inode);
+ ext4_msg(sb, KERN_ERR, "journal inode is deleted");
+ return NULL;
+ }
+
+ jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
+ journal_inode, journal_inode->i_size);
+ if (!S_ISREG(journal_inode->i_mode)) {
+ ext4_msg(sb, KERN_ERR, "invalid journal inode");
+ iput(journal_inode);
+ return NULL;
+ }
+
+ journal = jbd2_journal_init_inode(journal_inode);
+ if (!journal) {
+ ext4_msg(sb, KERN_ERR, "Could not load journal inode");
+ iput(journal_inode);
+ return NULL;
+ }
+ journal->j_private = sb;
+ ext4_init_journal_params(sb, journal);
+ return journal;
+}
+
+static journal_t *ext4_get_dev_journal(struct super_block *sb,
+ dev_t j_dev)
+{
+ struct buffer_head *bh;
+ journal_t *journal;
+ ext4_fsblk_t start;
+ ext4_fsblk_t len;
+ int hblock, blocksize;
+ ext4_fsblk_t sb_block;
+ unsigned long offset;
+ struct ext4_super_block *es;
+ struct block_device *bdev;
+
+ BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
+
+ bdev = ext4_blkdev_get(j_dev, sb);
+ if (bdev == NULL)
+ return NULL;
+
+ blocksize = sb->s_blocksize;
+ hblock = bdev_logical_block_size(bdev);
+ if (blocksize < hblock) {
+ ext4_msg(sb, KERN_ERR,
+ "blocksize too small for journal device");
+ goto out_bdev;
+ }
+
+ sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
+ offset = EXT4_MIN_BLOCK_SIZE % blocksize;
+ set_blocksize(bdev, blocksize);
+ if (!(bh = __bread(bdev, sb_block, blocksize))) {
+ ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
+ "external journal");
+ goto out_bdev;
+ }
+
+ es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
+ if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
+ !(le32_to_cpu(es->s_feature_incompat) &
+ EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
+ ext4_msg(sb, KERN_ERR, "external journal has "
+ "bad superblock");
+ brelse(bh);
+ goto out_bdev;
+ }
+
+ if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
+ ext4_msg(sb, KERN_ERR, "journal UUID does not match");
+ brelse(bh);
+ goto out_bdev;
+ }
+
+ len = ext4_blocks_count(es);
+ start = sb_block + 1;
+ brelse(bh); /* we're done with the superblock */
+
+ journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
+ start, len, blocksize);
+ if (!journal) {
+ ext4_msg(sb, KERN_ERR, "failed to create device journal");
+ goto out_bdev;
+ }
+ journal->j_private = sb;
+ ll_rw_block(READ, 1, &journal->j_sb_buffer);
+ wait_on_buffer(journal->j_sb_buffer);
+ if (!buffer_uptodate(journal->j_sb_buffer)) {
+ ext4_msg(sb, KERN_ERR, "I/O error on journal device");
+ goto out_journal;
+ }
+ if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
+ ext4_msg(sb, KERN_ERR, "External journal has more than one "
+ "user (unsupported) - %d",
+ be32_to_cpu(journal->j_superblock->s_nr_users));
+ goto out_journal;
+ }
+ EXT4_SB(sb)->journal_bdev = bdev;
+ ext4_init_journal_params(sb, journal);
+ return journal;
+
+out_journal:
+ jbd2_journal_destroy(journal);
+out_bdev:
+ ext4_blkdev_put(bdev);
+ return NULL;
+}
+
+static int ext4_load_journal(struct super_block *sb,
+ struct ext4_super_block *es,
+ unsigned long journal_devnum)
+{
+ journal_t *journal;
+ unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
+ dev_t journal_dev;
+ int err = 0;
+ int really_read_only;
+
+ BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
+
+ if (journal_devnum &&
+ journal_devnum != le32_to_cpu(es->s_journal_dev)) {
+ ext4_msg(sb, KERN_INFO, "external journal device major/minor "
+ "numbers have changed");
+ journal_dev = new_decode_dev(journal_devnum);
+ } else
+ journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
+
+ really_read_only = bdev_read_only(sb->s_bdev);
+
+ /*
+ * Are we loading a blank journal or performing recovery after a
+ * crash? For recovery, we need to check in advance whether we
+ * can get read-write access to the device.
+ */
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
+ if (sb->s_flags & MS_RDONLY) {
+ ext4_msg(sb, KERN_INFO, "INFO: recovery "
+ "required on readonly filesystem");
+ if (really_read_only) {
+ ext4_msg(sb, KERN_ERR, "write access "
+ "unavailable, cannot proceed");
+ return -EROFS;
+ }
+ ext4_msg(sb, KERN_INFO, "write access will "
+ "be enabled during recovery");
+ }
+ }
+
+ if (journal_inum && journal_dev) {
+ ext4_msg(sb, KERN_ERR, "filesystem has both journal "
+ "and inode journals!");
+ return -EINVAL;
+ }
+
+ if (journal_inum) {
+ if (!(journal = ext4_get_journal(sb, journal_inum)))
+ return -EINVAL;
+ } else {
+ if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
+ return -EINVAL;
+ }
+
+ if (!(journal->j_flags & JBD2_BARRIER))
+ ext4_msg(sb, KERN_INFO, "barriers disabled");
+
+ if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
+ err = jbd2_journal_wipe(journal, !really_read_only);
+ if (!err) {
+ char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
+ if (save)
+ memcpy(save, ((char *) es) +
+ EXT4_S_ERR_START, EXT4_S_ERR_LEN);
+ err = jbd2_journal_load(journal);
+ if (save)
+ memcpy(((char *) es) + EXT4_S_ERR_START,
+ save, EXT4_S_ERR_LEN);
+ kfree(save);
+ }
+
+ if (err) {
+ ext4_msg(sb, KERN_ERR, "error loading journal");
+ jbd2_journal_destroy(journal);
+ return err;
+ }
+
+ EXT4_SB(sb)->s_journal = journal;
+ ext4_clear_journal_err(sb, es);
+
+ if (!really_read_only && journal_devnum &&
+ journal_devnum != le32_to_cpu(es->s_journal_dev)) {
+ es->s_journal_dev = cpu_to_le32(journal_devnum);
+
+ /* Make sure we flush the recovery flag to disk. */
+ ext4_commit_super(sb, 1);
+ }
+
+ return 0;
+}
+
+static int ext4_commit_super(struct super_block *sb, int sync)
+{
+ struct ext4_super_block *es = EXT4_SB(sb)->s_es;
+ struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
+ int error = 0;
+
+ if (!sbh || block_device_ejected(sb))
+ return error;
+ if (buffer_write_io_error(sbh)) {
+ /*
+ * Oh, dear. A previous attempt to write the
+ * superblock failed. This could happen because the
+ * USB device was yanked out. Or it could happen to
+ * be a transient write error and maybe the block will
+ * be remapped. Nothing we can do but to retry the
+ * write and hope for the best.
+ */
+ ext4_msg(sb, KERN_ERR, "previous I/O error to "
+ "superblock detected");
+ clear_buffer_write_io_error(sbh);
+ set_buffer_uptodate(sbh);
+ }
+ /*
+ * If the file system is mounted read-only, don't update the
+ * superblock write time. This avoids updating the superblock
+ * write time when we are mounting the root file system
+ * read/only but we need to replay the journal; at that point,
+ * for people who are east of GMT and who make their clock
+ * tick in localtime for Windows bug-for-bug compatibility,
+ * the clock is set in the future, and this will cause e2fsck
+ * to complain and force a full file system check.
+ */
+ if (!(sb->s_flags & MS_RDONLY))
+ es->s_wtime = cpu_to_le32(get_seconds());
+ if (sb->s_bdev->bd_part)
+ es->s_kbytes_written =
+ cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
+ ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
+ EXT4_SB(sb)->s_sectors_written_start) >> 1));
+ else
+ es->s_kbytes_written =
+ cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
+ ext4_free_blocks_count_set(es,
+ EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
+ &EXT4_SB(sb)->s_freeclusters_counter)));
+ es->s_free_inodes_count =
+ cpu_to_le32(percpu_counter_sum_positive(
+ &EXT4_SB(sb)->s_freeinodes_counter));
+ sb->s_dirt = 0;
+ BUFFER_TRACE(sbh, "marking dirty");
+ mark_buffer_dirty(sbh);
+ if (sync) {
+ error = sync_dirty_buffer(sbh);
+ if (error)
+ return error;
+
+ error = buffer_write_io_error(sbh);
+ if (error) {
+ ext4_msg(sb, KERN_ERR, "I/O error while writing "
+ "superblock");
+ clear_buffer_write_io_error(sbh);
+ set_buffer_uptodate(sbh);
+ }
+ }
+ return error;
+}
+
+/*
+ * Have we just finished recovery? If so, and if we are mounting (or
+ * remounting) the filesystem readonly, then we will end up with a
+ * consistent fs on disk. Record that fact.
+ */
+static void ext4_mark_recovery_complete(struct super_block *sb,
+ struct ext4_super_block *es)
+{
+ journal_t *journal = EXT4_SB(sb)->s_journal;
+
+ if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
+ BUG_ON(journal != NULL);
+ return;
+ }
+ jbd2_journal_lock_updates(journal);
+ if (jbd2_journal_flush(journal) < 0)
+ goto out;
+
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
+ sb->s_flags & MS_RDONLY) {
+ EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
+ ext4_commit_super(sb, 1);
+ }
+
+out:
+ jbd2_journal_unlock_updates(journal);
+}
+
+/*
+ * If we are mounting (or read-write remounting) a filesystem whose journal
+ * has recorded an error from a previous lifetime, move that error to the
+ * main filesystem now.
+ */
+static void ext4_clear_journal_err(struct super_block *sb,
+ struct ext4_super_block *es)
+{
+ journal_t *journal;
+ int j_errno;
+ const char *errstr;
+
+ BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
+
+ journal = EXT4_SB(sb)->s_journal;
+
+ /*
+ * Now check for any error status which may have been recorded in the
+ * journal by a prior ext4_error() or ext4_abort()
+ */
+
+ j_errno = jbd2_journal_errno(journal);
+ if (j_errno) {
+ char nbuf[16];
+
+ errstr = ext4_decode_error(sb, j_errno, nbuf);
+ ext4_warning(sb, "Filesystem error recorded "
+ "from previous mount: %s", errstr);
+ ext4_warning(sb, "Marking fs in need of filesystem check.");
+
+ EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
+ es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
+ ext4_commit_super(sb, 1);
+
+ jbd2_journal_clear_err(journal);
+ jbd2_journal_update_sb_errno(journal);
+ }
+}
+
+/*
+ * Force the running and committing transactions to commit,
+ * and wait on the commit.
+ */
+int ext4_force_commit(struct super_block *sb)
+{
+ journal_t *journal;
+ int ret = 0;
+
+ if (sb->s_flags & MS_RDONLY)
+ return 0;
+
+ journal = EXT4_SB(sb)->s_journal;
+ if (journal) {
+ vfs_check_frozen(sb, SB_FREEZE_TRANS);
+ ret = ext4_journal_force_commit(journal);
+ }
+
+ return ret;
+}
+
+static void ext4_write_super(struct super_block *sb)
+{
+ lock_super(sb);
+ ext4_commit_super(sb, 1);
+ unlock_super(sb);
+}
+
+static int ext4_sync_fs(struct super_block *sb, int wait)
+{
+ int ret = 0;
+ tid_t target;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+
+ trace_ext4_sync_fs(sb, wait);
+ flush_workqueue(sbi->dio_unwritten_wq);
+ if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
+ if (wait)
+ jbd2_log_wait_commit(sbi->s_journal, target);
+ }
+ return ret;
+}
+
+/*
+ * LVM calls this function before a (read-only) snapshot is created. This
+ * gives us a chance to flush the journal completely and mark the fs clean.
+ *
+ * Note that only this function cannot bring a filesystem to be in a clean
+ * state independently, because ext4 prevents a new handle from being started
+ * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
+ * the upper layer.
+ */
+static int ext4_freeze(struct super_block *sb)
+{
+ int error = 0;
+ journal_t *journal;
+
+ if (sb->s_flags & MS_RDONLY)
+ return 0;
+
+ journal = EXT4_SB(sb)->s_journal;
+
+ /* Now we set up the journal barrier. */
+ jbd2_journal_lock_updates(journal);
+
+ /*
+ * Don't clear the needs_recovery flag if we failed to flush
+ * the journal.
+ */
+ error = jbd2_journal_flush(journal);
+ if (error < 0)
+ goto out;
+
+ /* Journal blocked and flushed, clear needs_recovery flag. */
+ EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
+ error = ext4_commit_super(sb, 1);
+out:
+ /* we rely on s_frozen to stop further updates */
+ jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+ return error;
+}
+
+/*
+ * Called by LVM after the snapshot is done. We need to reset the RECOVER
+ * flag here, even though the filesystem is not technically dirty yet.
+ */
+static int ext4_unfreeze(struct super_block *sb)
+{
+ if (sb->s_flags & MS_RDONLY)
+ return 0;
+
+ lock_super(sb);
+ /* Reset the needs_recovery flag before the fs is unlocked. */
+ EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
+ ext4_commit_super(sb, 1);
+ unlock_super(sb);
+ return 0;
+}
+
+/*
+ * Structure to save mount options for ext4_remount's benefit
+ */
+struct ext4_mount_options {
+ unsigned long s_mount_opt;
+ unsigned long s_mount_opt2;
+ uid_t s_resuid;
+ gid_t s_resgid;
+ unsigned long s_commit_interval;
+ u32 s_min_batch_time, s_max_batch_time;
+#ifdef CONFIG_QUOTA
+ int s_jquota_fmt;
+ char *s_qf_names[MAXQUOTAS];
+#endif
+};
+
+static int ext4_remount(struct super_block *sb, int *flags, char *data)
+{
+ struct ext4_super_block *es;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ unsigned long old_sb_flags;
+ struct ext4_mount_options old_opts;
+ int enable_quota = 0;
+ ext4_group_t g;
+ unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
+ int err = 0;
+#ifdef CONFIG_QUOTA
+ int i;
+#endif
+ char *orig_data = kstrdup(data, GFP_KERNEL);
+
+ /* Store the original options */
+ lock_super(sb);
+ old_sb_flags = sb->s_flags;
+ old_opts.s_mount_opt = sbi->s_mount_opt;
+ old_opts.s_mount_opt2 = sbi->s_mount_opt2;
+ old_opts.s_resuid = sbi->s_resuid;
+ old_opts.s_resgid = sbi->s_resgid;
+ old_opts.s_commit_interval = sbi->s_commit_interval;
+ old_opts.s_min_batch_time = sbi->s_min_batch_time;
+ old_opts.s_max_batch_time = sbi->s_max_batch_time;
+#ifdef CONFIG_QUOTA
+ old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
+ for (i = 0; i < MAXQUOTAS; i++)
+ old_opts.s_qf_names[i] = sbi->s_qf_names[i];
+#endif
+ if (sbi->s_journal && sbi->s_journal->j_task->io_context)
+ journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
+
+ /*
+ * Allow the "check" option to be passed as a remount option.
+ */
+ if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
+ err = -EINVAL;
+ goto restore_opts;
+ }
+
+ if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
+ if (test_opt2(sb, EXPLICIT_DELALLOC)) {
+ ext4_msg(sb, KERN_ERR, "can't mount with "
+ "both data=journal and delalloc");
+ err = -EINVAL;
+ goto restore_opts;
+ }
+ if (test_opt(sb, DIOREAD_NOLOCK)) {
+ ext4_msg(sb, KERN_ERR, "can't mount with "
+ "both data=journal and dioread_nolock");
+ err = -EINVAL;
+ goto restore_opts;
+ }
+ }
+
+ if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
+ ext4_abort(sb, "Abort forced by user");
+
+ sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
+ (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
+
+ es = sbi->s_es;
+
+ if (sbi->s_journal) {
+ ext4_init_journal_params(sb, sbi->s_journal);
+ set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
+ }
+
+ if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
+ if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
+ err = -EROFS;
+ goto restore_opts;
+ }
+
+ if (*flags & MS_RDONLY) {
+ err = dquot_suspend(sb, -1);
+ if (err < 0)
+ goto restore_opts;
+
+ /*
+ * First of all, the unconditional stuff we have to do
+ * to disable replay of the journal when we next remount
+ */
+ sb->s_flags |= MS_RDONLY;
+
+ /*
+ * OK, test if we are remounting a valid rw partition
+ * readonly, and if so set the rdonly flag and then
+ * mark the partition as valid again.
+ */
+ if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
+ (sbi->s_mount_state & EXT4_VALID_FS))
+ es->s_state = cpu_to_le16(sbi->s_mount_state);
+
+ if (sbi->s_journal)
+ ext4_mark_recovery_complete(sb, es);
+ } else {
+ /* Make sure we can mount this feature set readwrite */
+ if (!ext4_feature_set_ok(sb, 0)) {
+ err = -EROFS;
+ goto restore_opts;
+ }
+ /*
+ * Make sure the group descriptor checksums
+ * are sane. If they aren't, refuse to remount r/w.
+ */
+ for (g = 0; g < sbi->s_groups_count; g++) {
+ struct ext4_group_desc *gdp =
+ ext4_get_group_desc(sb, g, NULL);
+
+ if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
+ ext4_msg(sb, KERN_ERR,
+ "ext4_remount: Checksum for group %u failed (%u!=%u)",
+ g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
+ le16_to_cpu(gdp->bg_checksum));
+ err = -EINVAL;
+ goto restore_opts;
+ }
+ }
+
+ /*
+ * If we have an unprocessed orphan list hanging
+ * around from a previously readonly bdev mount,
+ * require a full umount/remount for now.
+ */
+ if (es->s_last_orphan) {
+ ext4_msg(sb, KERN_WARNING, "Couldn't "
+ "remount RDWR because of unprocessed "
+ "orphan inode list. Please "
+ "umount/remount instead");
+ err = -EINVAL;
+ goto restore_opts;
+ }
+
+ /*
+ * Mounting a RDONLY partition read-write, so reread
+ * and store the current valid flag. (It may have
+ * been changed by e2fsck since we originally mounted
+ * the partition.)
+ */
+ if (sbi->s_journal)
+ ext4_clear_journal_err(sb, es);
+ sbi->s_mount_state = le16_to_cpu(es->s_state);
+ if (!ext4_setup_super(sb, es, 0))
+ sb->s_flags &= ~MS_RDONLY;
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb,
+ EXT4_FEATURE_INCOMPAT_MMP))
+ if (ext4_multi_mount_protect(sb,
+ le64_to_cpu(es->s_mmp_block))) {
+ err = -EROFS;
+ goto restore_opts;
+ }
+ enable_quota = 1;
+ }
+ }
+
+ /*
+ * Reinitialize lazy itable initialization thread based on
+ * current settings
+ */
+ if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
+ ext4_unregister_li_request(sb);
+ else {
+ ext4_group_t first_not_zeroed;
+ first_not_zeroed = ext4_has_uninit_itable(sb);
+ ext4_register_li_request(sb, first_not_zeroed);
+ }
+
+ ext4_setup_system_zone(sb);
+ if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
+ ext4_commit_super(sb, 1);
+
+#ifdef CONFIG_QUOTA
+ /* Release old quota file names */
+ for (i = 0; i < MAXQUOTAS; i++)
+ if (old_opts.s_qf_names[i] &&
+ old_opts.s_qf_names[i] != sbi->s_qf_names[i])
+ kfree(old_opts.s_qf_names[i]);
+#endif
+ unlock_super(sb);
+ if (enable_quota)
+ dquot_resume(sb, -1);
+
+ ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
+ kfree(orig_data);
+ return 0;
+
+restore_opts:
+ sb->s_flags = old_sb_flags;
+ sbi->s_mount_opt = old_opts.s_mount_opt;
+ sbi->s_mount_opt2 = old_opts.s_mount_opt2;
+ sbi->s_resuid = old_opts.s_resuid;
+ sbi->s_resgid = old_opts.s_resgid;
+ sbi->s_commit_interval = old_opts.s_commit_interval;
+ sbi->s_min_batch_time = old_opts.s_min_batch_time;
+ sbi->s_max_batch_time = old_opts.s_max_batch_time;
+#ifdef CONFIG_QUOTA
+ sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
+ for (i = 0; i < MAXQUOTAS; i++) {
+ if (sbi->s_qf_names[i] &&
+ old_opts.s_qf_names[i] != sbi->s_qf_names[i])
+ kfree(sbi->s_qf_names[i]);
+ sbi->s_qf_names[i] = old_opts.s_qf_names[i];
+ }
+#endif
+ unlock_super(sb);
+ kfree(orig_data);
+ return err;
+}
+
+static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct super_block *sb = dentry->d_sb;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_super_block *es = sbi->s_es;
+ ext4_fsblk_t overhead = 0;
+ u64 fsid;
+ s64 bfree;
+
+ if (!test_opt(sb, MINIX_DF))
+ overhead = sbi->s_overhead;
+
+ buf->f_type = EXT4_SUPER_MAGIC;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, sbi->s_overhead);
+ bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
+ percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
+ /* prevent underflow in case that few free space is available */
+ buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
+ buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
+ if (buf->f_bfree < ext4_r_blocks_count(es))
+ buf->f_bavail = 0;
+ buf->f_files = le32_to_cpu(es->s_inodes_count);
+ buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
+ buf->f_namelen = EXT4_NAME_LEN;
+ fsid = le64_to_cpup((void *)es->s_uuid) ^
+ le64_to_cpup((void *)es->s_uuid + sizeof(u64));
+ buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
+ buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
+
+ return 0;
+}
+
+/* Helper function for writing quotas on sync - we need to start transaction
+ * before quota file is locked for write. Otherwise the are possible deadlocks:
+ * Process 1 Process 2
+ * ext4_create() quota_sync()
+ * jbd2_journal_start() write_dquot()
+ * dquot_initialize() down(dqio_mutex)
+ * down(dqio_mutex) jbd2_journal_start()
+ *
+ */
+
+#ifdef CONFIG_QUOTA
+
+static inline struct inode *dquot_to_inode(struct dquot *dquot)
+{
+ return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
+}
+
+static int ext4_write_dquot(struct dquot *dquot)
+{
+ int ret, err;
+ handle_t *handle;
+ struct inode *inode;
+
+ inode = dquot_to_inode(dquot);
+ handle = ext4_journal_start(inode,
+ EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+ ret = dquot_commit(dquot);
+ err = ext4_journal_stop(handle);
+ if (!ret)
+ ret = err;
+ return ret;
+}
+
+static int ext4_acquire_dquot(struct dquot *dquot)
+{
+ int ret, err;
+ handle_t *handle;
+
+ handle = ext4_journal_start(dquot_to_inode(dquot),
+ EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+ ret = dquot_acquire(dquot);
+ err = ext4_journal_stop(handle);
+ if (!ret)
+ ret = err;
+ return ret;
+}
+
+static int ext4_release_dquot(struct dquot *dquot)
+{
+ int ret, err;
+ handle_t *handle;
+
+ handle = ext4_journal_start(dquot_to_inode(dquot),
+ EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
+ if (IS_ERR(handle)) {
+ /* Release dquot anyway to avoid endless cycle in dqput() */
+ dquot_release(dquot);
+ return PTR_ERR(handle);
+ }
+ ret = dquot_release(dquot);
+ err = ext4_journal_stop(handle);
+ if (!ret)
+ ret = err;
+ return ret;
+}
+
+static int ext4_mark_dquot_dirty(struct dquot *dquot)
+{
+ /* Are we journaling quotas? */
+ if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
+ EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
+ dquot_mark_dquot_dirty(dquot);
+ return ext4_write_dquot(dquot);
+ } else {
+ return dquot_mark_dquot_dirty(dquot);
+ }
+}
+
+static int ext4_write_info(struct super_block *sb, int type)
+{
+ int ret, err;
+ handle_t *handle;
+
+ /* Data block + inode block */
+ handle = ext4_journal_start(sb->s_root->d_inode, 2);
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+ ret = dquot_commit_info(sb, type);
+ err = ext4_journal_stop(handle);
+ if (!ret)
+ ret = err;
+ return ret;
+}
+
+/*
+ * Turn on quotas during mount time - we need to find
+ * the quota file and such...
+ */
+static int ext4_quota_on_mount(struct super_block *sb, int type)
+{
+ return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
+ EXT4_SB(sb)->s_jquota_fmt, type);
+}
+
+/*
+ * Standard function to be called on quota_on
+ */
+static int ext4_quota_on(struct super_block *sb, int type, int format_id,
+ struct path *path)
+{
+ int err;
+
+ if (!test_opt(sb, QUOTA))
+ return -EINVAL;
+
+ /* Quotafile not on the same filesystem? */
+ if (path->dentry->d_sb != sb)
+ return -EXDEV;
+ /* Journaling quota? */
+ if (EXT4_SB(sb)->s_qf_names[type]) {
+ /* Quotafile not in fs root? */
+ if (path->dentry->d_parent != sb->s_root)
+ ext4_msg(sb, KERN_WARNING,
+ "Quota file not on filesystem root. "
+ "Journaled quota will not work");
+ }
+
+ /*
+ * When we journal data on quota file, we have to flush journal to see
+ * all updates to the file when we bypass pagecache...
+ */
+ if (EXT4_SB(sb)->s_journal &&
+ ext4_should_journal_data(path->dentry->d_inode)) {
+ /*
+ * We don't need to lock updates but journal_flush() could
+ * otherwise be livelocked...
+ */
+ jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
+ err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+ jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+ if (err)
+ return err;
+ }
+
+ return dquot_quota_on(sb, type, format_id, path);
+}
+
+static int ext4_quota_off(struct super_block *sb, int type)
+{
+ struct inode *inode = sb_dqopt(sb)->files[type];
+ handle_t *handle;
+
+ /* Force all delayed allocation blocks to be allocated.
+ * Caller already holds s_umount sem */
+ if (test_opt(sb, DELALLOC))
+ sync_filesystem(sb);
+
+ if (!inode)
+ goto out;
+
+ /* Update modification times of quota files when userspace can
+ * start looking at them */
+ handle = ext4_journal_start(inode, 1);
+ if (IS_ERR(handle))
+ goto out;
+ inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ ext4_mark_inode_dirty(handle, inode);
+ ext4_journal_stop(handle);
+
+out:
+ return dquot_quota_off(sb, type);
+}
+
+/* Read data from quotafile - avoid pagecache and such because we cannot afford
+ * acquiring the locks... As quota files are never truncated and quota code
+ * itself serializes the operations (and no one else should touch the files)
+ * we don't have to be afraid of races */
+static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
+ size_t len, loff_t off)
+{
+ struct inode *inode = sb_dqopt(sb)->files[type];
+ ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
+ int err = 0;
+ int offset = off & (sb->s_blocksize - 1);
+ int tocopy;
+ size_t toread;
+ struct buffer_head *bh;
+ loff_t i_size = i_size_read(inode);
+
+ if (off > i_size)
+ return 0;
+ if (off+len > i_size)
+ len = i_size-off;
+ toread = len;
+ while (toread > 0) {
+ tocopy = sb->s_blocksize - offset < toread ?
+ sb->s_blocksize - offset : toread;
+ bh = ext4_bread(NULL, inode, blk, 0, &err);
+ if (err)
+ return err;
+ if (!bh) /* A hole? */
+ memset(data, 0, tocopy);
+ else
+ memcpy(data, bh->b_data+offset, tocopy);
+ brelse(bh);
+ offset = 0;
+ toread -= tocopy;
+ data += tocopy;
+ blk++;
+ }
+ return len;
+}
+
+/* Write to quotafile (we know the transaction is already started and has
+ * enough credits) */
+static ssize_t ext4_quota_write(struct super_block *sb, int type,
+ const char *data, size_t len, loff_t off)
+{
+ struct inode *inode = sb_dqopt(sb)->files[type];
+ ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
+ int err = 0;
+ int offset = off & (sb->s_blocksize - 1);
+ struct buffer_head *bh;
+ handle_t *handle = journal_current_handle();
+
+ if (EXT4_SB(sb)->s_journal && !handle) {
+ ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
+ " cancelled because transaction is not started",
+ (unsigned long long)off, (unsigned long long)len);
+ return -EIO;
+ }
+ /*
+ * Since we account only one data block in transaction credits,
+ * then it is impossible to cross a block boundary.
+ */
+ if (sb->s_blocksize - offset < len) {
+ ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
+ " cancelled because not block aligned",
+ (unsigned long long)off, (unsigned long long)len);
+ return -EIO;
+ }
+
+ mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
+ bh = ext4_bread(handle, inode, blk, 1, &err);
+ if (!bh)
+ goto out;
+ err = ext4_journal_get_write_access(handle, bh);
+ if (err) {
+ brelse(bh);
+ goto out;
+ }
+ lock_buffer(bh);
+ memcpy(bh->b_data+offset, data, len);
+ flush_dcache_page(bh->b_page);
+ unlock_buffer(bh);
+ err = ext4_handle_dirty_metadata(handle, NULL, bh);
+ brelse(bh);
+out:
+ if (err) {
+ mutex_unlock(&inode->i_mutex);
+ return err;
+ }
+ if (inode->i_size < off + len) {
+ i_size_write(inode, off + len);
+ EXT4_I(inode)->i_disksize = inode->i_size;
+ ext4_mark_inode_dirty(handle, inode);
+ }
+ mutex_unlock(&inode->i_mutex);
+ return len;
+}
+
+#endif
+
+static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
+}
+
+#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
+static inline void register_as_ext2(void)
+{
+ int err = register_filesystem(&ext2_fs_type);
+ if (err)
+ printk(KERN_WARNING
+ "EXT4-fs: Unable to register as ext2 (%d)\n", err);
+}
+
+static inline void unregister_as_ext2(void)
+{
+ unregister_filesystem(&ext2_fs_type);
+}
+
+static inline int ext2_feature_set_ok(struct super_block *sb)
+{
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
+ return 0;
+ if (sb->s_flags & MS_RDONLY)
+ return 1;
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
+ return 0;
+ return 1;
+}
+MODULE_ALIAS("ext2");
+#else
+static inline void register_as_ext2(void) { }
+static inline void unregister_as_ext2(void) { }
+static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
+#endif
+
+#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
+static inline void register_as_ext3(void)
+{
+ int err = register_filesystem(&ext3_fs_type);
+ if (err)
+ printk(KERN_WARNING
+ "EXT4-fs: Unable to register as ext3 (%d)\n", err);
+}
+
+static inline void unregister_as_ext3(void)
+{
+ unregister_filesystem(&ext3_fs_type);
+}
+
+static inline int ext3_feature_set_ok(struct super_block *sb)
+{
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
+ return 0;
+ if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
+ return 0;
+ if (sb->s_flags & MS_RDONLY)
+ return 1;
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
+ return 0;
+ return 1;
+}
+MODULE_ALIAS("ext3");
+#else
+static inline void register_as_ext3(void) { }
+static inline void unregister_as_ext3(void) { }
+static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
+#endif
+
+static struct file_system_type ext4_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "ext4",
+ .mount = ext4_mount,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+
+static int __init ext4_init_feat_adverts(void)
+{
+ struct ext4_features *ef;
+ int ret = -ENOMEM;
+
+ ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
+ if (!ef)
+ goto out;
+
+ ef->f_kobj.kset = ext4_kset;
+ init_completion(&ef->f_kobj_unregister);
+ ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
+ "features");
+ if (ret) {
+ kfree(ef);
+ goto out;
+ }
+
+ ext4_feat = ef;
+ ret = 0;
+out:
+ return ret;
+}
+
+static void ext4_exit_feat_adverts(void)
+{
+ kobject_put(&ext4_feat->f_kobj);
+ wait_for_completion(&ext4_feat->f_kobj_unregister);
+ kfree(ext4_feat);
+}
+
+/* Shared across all ext4 file systems */
+wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
+struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
+
+static int __init ext4_init_fs(void)
+{
+ int i, err;
+
+ ext4_li_info = NULL;
+ mutex_init(&ext4_li_mtx);
+
+ ext4_check_flag_values();
+
+ for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
+ mutex_init(&ext4__aio_mutex[i]);
+ init_waitqueue_head(&ext4__ioend_wq[i]);
+ }
+
+ err = ext4_init_pageio();
+ if (err)
+ return err;
+ err = ext4_init_system_zone();
+ if (err)
+ goto out6;
+ ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
+ if (!ext4_kset)
+ goto out5;
+ ext4_proc_root = proc_mkdir("fs/ext4", NULL);
+
+ err = ext4_init_feat_adverts();
+ if (err)
+ goto out4;
+
+ err = ext4_init_mballoc();
+ if (err)
+ goto out3;
+
+ err = ext4_init_xattr();
+ if (err)
+ goto out2;
+ err = init_inodecache();
+ if (err)
+ goto out1;
+ register_as_ext3();
+ register_as_ext2();
+ err = register_filesystem(&ext4_fs_type);
+ if (err)
+ goto out;
+
+ return 0;
+out:
+ unregister_as_ext2();
+ unregister_as_ext3();
+ destroy_inodecache();
+out1:
+ ext4_exit_xattr();
+out2:
+ ext4_exit_mballoc();
+out3:
+ ext4_exit_feat_adverts();
+out4:
+ if (ext4_proc_root)
+ remove_proc_entry("fs/ext4", NULL);
+ kset_unregister(ext4_kset);
+out5:
+ ext4_exit_system_zone();
+out6:
+ ext4_exit_pageio();
+ return err;
+}
+
+static void __exit ext4_exit_fs(void)
+{
+ ext4_destroy_lazyinit_thread();
+ unregister_as_ext2();
+ unregister_as_ext3();
+ unregister_filesystem(&ext4_fs_type);
+ destroy_inodecache();
+ ext4_exit_xattr();
+ ext4_exit_mballoc();
+ ext4_exit_feat_adverts();
+ remove_proc_entry("fs/ext4", NULL);
+ kset_unregister(ext4_kset);
+ ext4_exit_system_zone();
+ ext4_exit_pageio();
+}
+
+MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
+MODULE_DESCRIPTION("Fourth Extended Filesystem");
+MODULE_LICENSE("GPL");
+module_init(ext4_init_fs)
+module_exit(ext4_exit_fs)