[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/fs/jfs/super.c b/ap/os/linux/linux-3.4.x/fs/jfs/super.c
new file mode 100644
index 0000000..4a82950
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/jfs/super.c
@@ -0,0 +1,905 @@
+/*
+ * Copyright (C) International Business Machines Corp., 2000-2004
+ * Portions Copyright (C) Christoph Hellwig, 2001-2002
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/parser.h>
+#include <linux/completion.h>
+#include <linux/vfs.h>
+#include <linux/quotaops.h>
+#include <linux/mount.h>
+#include <linux/moduleparam.h>
+#include <linux/kthread.h>
+#include <linux/posix_acl.h>
+#include <linux/buffer_head.h>
+#include <linux/exportfs.h>
+#include <linux/crc32.h>
+#include <linux/slab.h>
+#include <asm/uaccess.h>
+#include <linux/seq_file.h>
+
+#include "jfs_incore.h"
+#include "jfs_filsys.h"
+#include "jfs_inode.h"
+#include "jfs_metapage.h"
+#include "jfs_superblock.h"
+#include "jfs_dmap.h"
+#include "jfs_imap.h"
+#include "jfs_acl.h"
+#include "jfs_debug.h"
+
+MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
+MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
+MODULE_LICENSE("GPL");
+
+static struct kmem_cache * jfs_inode_cachep;
+
+static const struct super_operations jfs_super_operations;
+static const struct export_operations jfs_export_operations;
+static struct file_system_type jfs_fs_type;
+
+#define MAX_COMMIT_THREADS 64
+static int commit_threads = 0;
+module_param(commit_threads, int, 0);
+MODULE_PARM_DESC(commit_threads, "Number of commit threads");
+
+static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
+struct task_struct *jfsIOthread;
+struct task_struct *jfsSyncThread;
+
+#ifdef CONFIG_JFS_DEBUG
+int jfsloglevel = JFS_LOGLEVEL_WARN;
+module_param(jfsloglevel, int, 0644);
+MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
+#endif
+
+static void jfs_handle_error(struct super_block *sb)
+{
+ struct jfs_sb_info *sbi = JFS_SBI(sb);
+
+ if (sb->s_flags & MS_RDONLY)
+ return;
+
+ updateSuper(sb, FM_DIRTY);
+
+ if (sbi->flag & JFS_ERR_PANIC)
+ panic("JFS (device %s): panic forced after error\n",
+ sb->s_id);
+ else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
+ jfs_err("ERROR: (device %s): remounting filesystem "
+ "as read-only\n",
+ sb->s_id);
+ sb->s_flags |= MS_RDONLY;
+ }
+
+ /* nothing is done for continue beyond marking the superblock dirty */
+}
+
+void jfs_error(struct super_block *sb, const char * function, ...)
+{
+ static char error_buf[256];
+ va_list args;
+
+ va_start(args, function);
+ vsnprintf(error_buf, sizeof(error_buf), function, args);
+ va_end(args);
+
+ printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
+
+ jfs_handle_error(sb);
+}
+
+static struct inode *jfs_alloc_inode(struct super_block *sb)
+{
+ struct jfs_inode_info *jfs_inode;
+
+ jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
+ if (!jfs_inode)
+ return NULL;
+ return &jfs_inode->vfs_inode;
+}
+
+static void jfs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ struct jfs_inode_info *ji = JFS_IP(inode);
+ kmem_cache_free(jfs_inode_cachep, ji);
+}
+
+static void jfs_destroy_inode(struct inode *inode)
+{
+ struct jfs_inode_info *ji = JFS_IP(inode);
+
+ BUG_ON(!list_empty(&ji->anon_inode_list));
+
+ spin_lock_irq(&ji->ag_lock);
+ if (ji->active_ag != -1) {
+ struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
+ atomic_dec(&bmap->db_active[ji->active_ag]);
+ ji->active_ag = -1;
+ }
+ spin_unlock_irq(&ji->ag_lock);
+ call_rcu(&inode->i_rcu, jfs_i_callback);
+}
+
+static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
+ s64 maxinodes;
+ struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
+
+ jfs_info("In jfs_statfs");
+ buf->f_type = JFS_SUPER_MAGIC;
+ buf->f_bsize = sbi->bsize;
+ buf->f_blocks = sbi->bmap->db_mapsize;
+ buf->f_bfree = sbi->bmap->db_nfree;
+ buf->f_bavail = sbi->bmap->db_nfree;
+ /*
+ * If we really return the number of allocated & free inodes, some
+ * applications will fail because they won't see enough free inodes.
+ * We'll try to calculate some guess as to how may inodes we can
+ * really allocate
+ *
+ * buf->f_files = atomic_read(&imap->im_numinos);
+ * buf->f_ffree = atomic_read(&imap->im_numfree);
+ */
+ maxinodes = min((s64) atomic_read(&imap->im_numinos) +
+ ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
+ << L2INOSPEREXT), (s64) 0xffffffffLL);
+ buf->f_files = maxinodes;
+ buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
+ atomic_read(&imap->im_numfree));
+ buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
+ buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
+ sizeof(sbi->uuid)/2);
+
+ buf->f_namelen = JFS_NAME_MAX;
+ return 0;
+}
+
+static void jfs_put_super(struct super_block *sb)
+{
+ struct jfs_sb_info *sbi = JFS_SBI(sb);
+ int rc;
+
+ jfs_info("In jfs_put_super");
+
+ dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
+
+ rc = jfs_umount(sb);
+ if (rc)
+ jfs_err("jfs_umount failed with return code %d", rc);
+
+ unload_nls(sbi->nls_tab);
+
+ truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
+ iput(sbi->direct_inode);
+
+ kfree(sbi);
+}
+
+enum {
+ Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
+ Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
+ Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
+};
+
+static const match_table_t tokens = {
+ {Opt_integrity, "integrity"},
+ {Opt_nointegrity, "nointegrity"},
+ {Opt_iocharset, "iocharset=%s"},
+ {Opt_resize, "resize=%u"},
+ {Opt_resize_nosize, "resize"},
+ {Opt_errors, "errors=%s"},
+ {Opt_ignore, "noquota"},
+ {Opt_ignore, "quota"},
+ {Opt_usrquota, "usrquota"},
+ {Opt_grpquota, "grpquota"},
+ {Opt_uid, "uid=%u"},
+ {Opt_gid, "gid=%u"},
+ {Opt_umask, "umask=%u"},
+ {Opt_err, NULL}
+};
+
+static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
+ int *flag)
+{
+ void *nls_map = (void *)-1; /* -1: no change; NULL: none */
+ char *p;
+ struct jfs_sb_info *sbi = JFS_SBI(sb);
+
+ *newLVSize = 0;
+
+ if (!options)
+ return 1;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ substring_t args[MAX_OPT_ARGS];
+ int token;
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_integrity:
+ *flag &= ~JFS_NOINTEGRITY;
+ break;
+ case Opt_nointegrity:
+ *flag |= JFS_NOINTEGRITY;
+ break;
+ case Opt_ignore:
+ /* Silently ignore the quota options */
+ /* Don't do anything ;-) */
+ break;
+ case Opt_iocharset:
+ if (nls_map && nls_map != (void *) -1)
+ unload_nls(nls_map);
+ if (!strcmp(args[0].from, "none"))
+ nls_map = NULL;
+ else {
+ nls_map = load_nls(args[0].from);
+ if (!nls_map) {
+ printk(KERN_ERR
+ "JFS: charset not found\n");
+ goto cleanup;
+ }
+ }
+ break;
+ case Opt_resize:
+ {
+ char *resize = args[0].from;
+ *newLVSize = simple_strtoull(resize, &resize, 0);
+ break;
+ }
+ case Opt_resize_nosize:
+ {
+ *newLVSize = sb->s_bdev->bd_inode->i_size >>
+ sb->s_blocksize_bits;
+ if (*newLVSize == 0)
+ printk(KERN_ERR
+ "JFS: Cannot determine volume size\n");
+ break;
+ }
+ case Opt_errors:
+ {
+ char *errors = args[0].from;
+ if (!errors || !*errors)
+ goto cleanup;
+ if (!strcmp(errors, "continue")) {
+ *flag &= ~JFS_ERR_REMOUNT_RO;
+ *flag &= ~JFS_ERR_PANIC;
+ *flag |= JFS_ERR_CONTINUE;
+ } else if (!strcmp(errors, "remount-ro")) {
+ *flag &= ~JFS_ERR_CONTINUE;
+ *flag &= ~JFS_ERR_PANIC;
+ *flag |= JFS_ERR_REMOUNT_RO;
+ } else if (!strcmp(errors, "panic")) {
+ *flag &= ~JFS_ERR_CONTINUE;
+ *flag &= ~JFS_ERR_REMOUNT_RO;
+ *flag |= JFS_ERR_PANIC;
+ } else {
+ printk(KERN_ERR
+ "JFS: %s is an invalid error handler\n",
+ errors);
+ goto cleanup;
+ }
+ break;
+ }
+
+#ifdef CONFIG_QUOTA
+ case Opt_quota:
+ case Opt_usrquota:
+ *flag |= JFS_USRQUOTA;
+ break;
+ case Opt_grpquota:
+ *flag |= JFS_GRPQUOTA;
+ break;
+#else
+ case Opt_usrquota:
+ case Opt_grpquota:
+ case Opt_quota:
+ printk(KERN_ERR
+ "JFS: quota operations not supported\n");
+ break;
+#endif
+ case Opt_uid:
+ {
+ char *uid = args[0].from;
+ sbi->uid = simple_strtoul(uid, &uid, 0);
+ break;
+ }
+ case Opt_gid:
+ {
+ char *gid = args[0].from;
+ sbi->gid = simple_strtoul(gid, &gid, 0);
+ break;
+ }
+ case Opt_umask:
+ {
+ char *umask = args[0].from;
+ sbi->umask = simple_strtoul(umask, &umask, 8);
+ if (sbi->umask & ~0777) {
+ printk(KERN_ERR
+ "JFS: Invalid value of umask\n");
+ goto cleanup;
+ }
+ break;
+ }
+ default:
+ printk("jfs: Unrecognized mount option \"%s\" "
+ " or missing value\n", p);
+ goto cleanup;
+ }
+ }
+
+ if (nls_map != (void *) -1) {
+ /* Discard old (if remount) */
+ unload_nls(sbi->nls_tab);
+ sbi->nls_tab = nls_map;
+ }
+ return 1;
+
+cleanup:
+ if (nls_map && nls_map != (void *) -1)
+ unload_nls(nls_map);
+ return 0;
+}
+
+static int jfs_remount(struct super_block *sb, int *flags, char *data)
+{
+ s64 newLVSize = 0;
+ int rc = 0;
+ int flag = JFS_SBI(sb)->flag;
+ int ret;
+
+ if (!parse_options(data, sb, &newLVSize, &flag)) {
+ return -EINVAL;
+ }
+
+ if (newLVSize) {
+ if (sb->s_flags & MS_RDONLY) {
+ printk(KERN_ERR
+ "JFS: resize requires volume to be mounted read-write\n");
+ return -EROFS;
+ }
+ rc = jfs_extendfs(sb, newLVSize, 0);
+ if (rc)
+ return rc;
+ }
+
+ if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
+ /*
+ * Invalidate any previously read metadata. fsck may have
+ * changed the on-disk data since we mounted r/o
+ */
+ truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
+
+ JFS_SBI(sb)->flag = flag;
+ ret = jfs_mount_rw(sb, 1);
+
+ /* mark the fs r/w for quota activity */
+ sb->s_flags &= ~MS_RDONLY;
+
+ dquot_resume(sb, -1);
+ return ret;
+ }
+ if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
+ rc = dquot_suspend(sb, -1);
+ if (rc < 0) {
+ return rc;
+ }
+ rc = jfs_umount_rw(sb);
+ JFS_SBI(sb)->flag = flag;
+ return rc;
+ }
+ if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
+ if (!(sb->s_flags & MS_RDONLY)) {
+ rc = jfs_umount_rw(sb);
+ if (rc)
+ return rc;
+
+ JFS_SBI(sb)->flag = flag;
+ ret = jfs_mount_rw(sb, 1);
+ return ret;
+ }
+ JFS_SBI(sb)->flag = flag;
+
+ return 0;
+}
+
+static int jfs_fill_super(struct super_block *sb, void *data, int silent)
+{
+ struct jfs_sb_info *sbi;
+ struct inode *inode;
+ int rc;
+ s64 newLVSize = 0;
+ int flag, ret = -EINVAL;
+
+ jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
+
+ if (!new_valid_dev(sb->s_bdev->bd_dev))
+ return -EOVERFLOW;
+
+ sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
+ if (!sbi)
+ return -ENOMEM;
+
+ sb->s_fs_info = sbi;
+ sb->s_max_links = JFS_LINK_MAX;
+ sbi->sb = sb;
+ sbi->uid = sbi->gid = sbi->umask = -1;
+
+ /* initialize the mount flag and determine the default error handler */
+ flag = JFS_ERR_REMOUNT_RO;
+
+ if (!parse_options((char *) data, sb, &newLVSize, &flag))
+ goto out_kfree;
+ sbi->flag = flag;
+
+#ifdef CONFIG_JFS_POSIX_ACL
+ sb->s_flags |= MS_POSIXACL;
+#endif
+
+ if (newLVSize) {
+ printk(KERN_ERR "resize option for remount only\n");
+ goto out_kfree;
+ }
+
+ /*
+ * Initialize blocksize to 4K.
+ */
+ sb_set_blocksize(sb, PSIZE);
+
+ /*
+ * Set method vectors.
+ */
+ sb->s_op = &jfs_super_operations;
+ sb->s_export_op = &jfs_export_operations;
+#ifdef CONFIG_QUOTA
+ sb->dq_op = &dquot_operations;
+ sb->s_qcop = &dquot_quotactl_ops;
+#endif
+
+ /*
+ * Initialize direct-mapping inode/address-space
+ */
+ inode = new_inode(sb);
+ if (inode == NULL) {
+ ret = -ENOMEM;
+ goto out_unload;
+ }
+ inode->i_ino = 0;
+ inode->i_size = sb->s_bdev->bd_inode->i_size;
+ inode->i_mapping->a_ops = &jfs_metapage_aops;
+ insert_inode_hash(inode);
+ mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
+
+ sbi->direct_inode = inode;
+
+ rc = jfs_mount(sb);
+ if (rc) {
+ if (!silent) {
+ jfs_err("jfs_mount failed w/return code = %d", rc);
+ }
+ goto out_mount_failed;
+ }
+ if (sb->s_flags & MS_RDONLY)
+ sbi->log = NULL;
+ else {
+ rc = jfs_mount_rw(sb, 0);
+ if (rc) {
+ if (!silent) {
+ jfs_err("jfs_mount_rw failed, return code = %d",
+ rc);
+ }
+ goto out_no_rw;
+ }
+ }
+
+ sb->s_magic = JFS_SUPER_MAGIC;
+
+ if (sbi->mntflag & JFS_OS2)
+ sb->s_d_op = &jfs_ci_dentry_operations;
+
+ inode = jfs_iget(sb, ROOT_I);
+ if (IS_ERR(inode)) {
+ ret = PTR_ERR(inode);
+ goto out_no_rw;
+ }
+ sb->s_root = d_make_root(inode);
+ if (!sb->s_root)
+ goto out_no_root;
+
+ /* logical blocks are represented by 40 bits in pxd_t, etc. */
+ sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
+#if BITS_PER_LONG == 32
+ /*
+ * Page cache is indexed by long.
+ * I would use MAX_LFS_FILESIZE, but it's only half as big
+ */
+ sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
+#endif
+ sb->s_time_gran = 1;
+ return 0;
+
+out_no_root:
+ jfs_err("jfs_read_super: get root dentry failed");
+
+out_no_rw:
+ rc = jfs_umount(sb);
+ if (rc) {
+ jfs_err("jfs_umount failed with return code %d", rc);
+ }
+out_mount_failed:
+ filemap_write_and_wait(sbi->direct_inode->i_mapping);
+ truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
+ make_bad_inode(sbi->direct_inode);
+ iput(sbi->direct_inode);
+ sbi->direct_inode = NULL;
+out_unload:
+ if (sbi->nls_tab)
+ unload_nls(sbi->nls_tab);
+out_kfree:
+ kfree(sbi);
+ return ret;
+}
+
+static int jfs_freeze(struct super_block *sb)
+{
+ struct jfs_sb_info *sbi = JFS_SBI(sb);
+ struct jfs_log *log = sbi->log;
+
+ if (!(sb->s_flags & MS_RDONLY)) {
+ txQuiesce(sb);
+ lmLogShutdown(log);
+ updateSuper(sb, FM_CLEAN);
+ }
+ return 0;
+}
+
+static int jfs_unfreeze(struct super_block *sb)
+{
+ struct jfs_sb_info *sbi = JFS_SBI(sb);
+ struct jfs_log *log = sbi->log;
+ int rc = 0;
+
+ if (!(sb->s_flags & MS_RDONLY)) {
+ updateSuper(sb, FM_MOUNT);
+ if ((rc = lmLogInit(log)))
+ jfs_err("jfs_unlock failed with return code %d", rc);
+ else
+ txResume(sb);
+ }
+ return 0;
+}
+
+static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
+}
+
+static int jfs_sync_fs(struct super_block *sb, int wait)
+{
+ struct jfs_log *log = JFS_SBI(sb)->log;
+
+ /* log == NULL indicates read-only mount */
+ if (log) {
+ jfs_flush_journal(log, wait);
+ jfs_syncpt(log, 0);
+ }
+
+ return 0;
+}
+
+static int jfs_show_options(struct seq_file *seq, struct dentry *root)
+{
+ struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
+
+ if (sbi->uid != -1)
+ seq_printf(seq, ",uid=%d", sbi->uid);
+ if (sbi->gid != -1)
+ seq_printf(seq, ",gid=%d", sbi->gid);
+ if (sbi->umask != -1)
+ seq_printf(seq, ",umask=%03o", sbi->umask);
+ if (sbi->flag & JFS_NOINTEGRITY)
+ seq_puts(seq, ",nointegrity");
+ if (sbi->nls_tab)
+ seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
+ if (sbi->flag & JFS_ERR_CONTINUE)
+ seq_printf(seq, ",errors=continue");
+ if (sbi->flag & JFS_ERR_PANIC)
+ seq_printf(seq, ",errors=panic");
+
+#ifdef CONFIG_QUOTA
+ if (sbi->flag & JFS_USRQUOTA)
+ seq_puts(seq, ",usrquota");
+
+ if (sbi->flag & JFS_GRPQUOTA)
+ seq_puts(seq, ",grpquota");
+#endif
+
+ return 0;
+}
+
+#ifdef CONFIG_QUOTA
+
+/* 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 jfs_quota_read(struct super_block *sb, int type, char *data,
+ size_t len, loff_t off)
+{
+ struct inode *inode = sb_dqopt(sb)->files[type];
+ sector_t blk = off >> sb->s_blocksize_bits;
+ int err = 0;
+ int offset = off & (sb->s_blocksize - 1);
+ int tocopy;
+ size_t toread;
+ struct buffer_head tmp_bh;
+ 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;
+
+ tmp_bh.b_state = 0;
+ tmp_bh.b_size = 1 << inode->i_blkbits;
+ err = jfs_get_block(inode, blk, &tmp_bh, 0);
+ if (err)
+ return err;
+ if (!buffer_mapped(&tmp_bh)) /* A hole? */
+ memset(data, 0, tocopy);
+ else {
+ bh = sb_bread(sb, tmp_bh.b_blocknr);
+ if (!bh)
+ return -EIO;
+ memcpy(data, bh->b_data+offset, tocopy);
+ brelse(bh);
+ }
+ offset = 0;
+ toread -= tocopy;
+ data += tocopy;
+ blk++;
+ }
+ return len;
+}
+
+/* Write to quotafile */
+static ssize_t jfs_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];
+ sector_t blk = off >> sb->s_blocksize_bits;
+ int err = 0;
+ int offset = off & (sb->s_blocksize - 1);
+ int tocopy;
+ size_t towrite = len;
+ struct buffer_head tmp_bh;
+ struct buffer_head *bh;
+
+ mutex_lock(&inode->i_mutex);
+ while (towrite > 0) {
+ tocopy = sb->s_blocksize - offset < towrite ?
+ sb->s_blocksize - offset : towrite;
+
+ tmp_bh.b_state = 0;
+ tmp_bh.b_size = 1 << inode->i_blkbits;
+ err = jfs_get_block(inode, blk, &tmp_bh, 1);
+ if (err)
+ goto out;
+ if (offset || tocopy != sb->s_blocksize)
+ bh = sb_bread(sb, tmp_bh.b_blocknr);
+ else
+ bh = sb_getblk(sb, tmp_bh.b_blocknr);
+ if (!bh) {
+ err = -EIO;
+ goto out;
+ }
+ lock_buffer(bh);
+ memcpy(bh->b_data+offset, data, tocopy);
+ flush_dcache_page(bh->b_page);
+ set_buffer_uptodate(bh);
+ mark_buffer_dirty(bh);
+ unlock_buffer(bh);
+ brelse(bh);
+ offset = 0;
+ towrite -= tocopy;
+ data += tocopy;
+ blk++;
+ }
+out:
+ if (len == towrite) {
+ mutex_unlock(&inode->i_mutex);
+ return err;
+ }
+ if (inode->i_size < off+len-towrite)
+ i_size_write(inode, off+len-towrite);
+ inode->i_version++;
+ inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ mark_inode_dirty(inode);
+ mutex_unlock(&inode->i_mutex);
+ return len - towrite;
+}
+
+#endif
+
+static const struct super_operations jfs_super_operations = {
+ .alloc_inode = jfs_alloc_inode,
+ .destroy_inode = jfs_destroy_inode,
+ .dirty_inode = jfs_dirty_inode,
+ .write_inode = jfs_write_inode,
+ .evict_inode = jfs_evict_inode,
+ .put_super = jfs_put_super,
+ .sync_fs = jfs_sync_fs,
+ .freeze_fs = jfs_freeze,
+ .unfreeze_fs = jfs_unfreeze,
+ .statfs = jfs_statfs,
+ .remount_fs = jfs_remount,
+ .show_options = jfs_show_options,
+#ifdef CONFIG_QUOTA
+ .quota_read = jfs_quota_read,
+ .quota_write = jfs_quota_write,
+#endif
+};
+
+static const struct export_operations jfs_export_operations = {
+ .fh_to_dentry = jfs_fh_to_dentry,
+ .fh_to_parent = jfs_fh_to_parent,
+ .get_parent = jfs_get_parent,
+};
+
+static struct file_system_type jfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "jfs",
+ .mount = jfs_do_mount,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+
+static void init_once(void *foo)
+{
+ struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
+
+ memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
+ INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
+ init_rwsem(&jfs_ip->rdwrlock);
+ mutex_init(&jfs_ip->commit_mutex);
+ init_rwsem(&jfs_ip->xattr_sem);
+ spin_lock_init(&jfs_ip->ag_lock);
+ jfs_ip->active_ag = -1;
+ inode_init_once(&jfs_ip->vfs_inode);
+}
+
+static int __init init_jfs_fs(void)
+{
+ int i;
+ int rc;
+
+ jfs_inode_cachep =
+ kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
+ SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
+ init_once);
+ if (jfs_inode_cachep == NULL)
+ return -ENOMEM;
+
+ /*
+ * Metapage initialization
+ */
+ rc = metapage_init();
+ if (rc) {
+ jfs_err("metapage_init failed w/rc = %d", rc);
+ goto free_slab;
+ }
+
+ /*
+ * Transaction Manager initialization
+ */
+ rc = txInit();
+ if (rc) {
+ jfs_err("txInit failed w/rc = %d", rc);
+ goto free_metapage;
+ }
+
+ /*
+ * I/O completion thread (endio)
+ */
+ jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
+ if (IS_ERR(jfsIOthread)) {
+ rc = PTR_ERR(jfsIOthread);
+ jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
+ goto end_txmngr;
+ }
+
+ if (commit_threads < 1)
+ commit_threads = num_online_cpus();
+ if (commit_threads > MAX_COMMIT_THREADS)
+ commit_threads = MAX_COMMIT_THREADS;
+
+ for (i = 0; i < commit_threads; i++) {
+ jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
+ if (IS_ERR(jfsCommitThread[i])) {
+ rc = PTR_ERR(jfsCommitThread[i]);
+ jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
+ commit_threads = i;
+ goto kill_committask;
+ }
+ }
+
+ jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
+ if (IS_ERR(jfsSyncThread)) {
+ rc = PTR_ERR(jfsSyncThread);
+ jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
+ goto kill_committask;
+ }
+
+#ifdef PROC_FS_JFS
+ jfs_proc_init();
+#endif
+
+ rc = register_filesystem(&jfs_fs_type);
+ if (!rc)
+ return 0;
+
+#ifdef PROC_FS_JFS
+ jfs_proc_clean();
+#endif
+ kthread_stop(jfsSyncThread);
+kill_committask:
+ for (i = 0; i < commit_threads; i++)
+ kthread_stop(jfsCommitThread[i]);
+ kthread_stop(jfsIOthread);
+end_txmngr:
+ txExit();
+free_metapage:
+ metapage_exit();
+free_slab:
+ kmem_cache_destroy(jfs_inode_cachep);
+ return rc;
+}
+
+static void __exit exit_jfs_fs(void)
+{
+ int i;
+
+ jfs_info("exit_jfs_fs called");
+
+ txExit();
+ metapage_exit();
+
+ kthread_stop(jfsIOthread);
+ for (i = 0; i < commit_threads; i++)
+ kthread_stop(jfsCommitThread[i]);
+ kthread_stop(jfsSyncThread);
+#ifdef PROC_FS_JFS
+ jfs_proc_clean();
+#endif
+ unregister_filesystem(&jfs_fs_type);
+ kmem_cache_destroy(jfs_inode_cachep);
+}
+
+module_init(init_jfs_fs)
+module_exit(exit_jfs_fs)