[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/fs/f2fs/dir.c b/src/kernel/linux/v4.14/fs/f2fs/dir.c
new file mode 100644
index 0000000..7e2264f
--- /dev/null
+++ b/src/kernel/linux/v4.14/fs/f2fs/dir.c
@@ -0,0 +1,942 @@
+/*
+ * fs/f2fs/dir.c
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/fs.h>
+#include <linux/f2fs_fs.h>
+#include <linux/sched/signal.h>
+#include "f2fs.h"
+#include "node.h"
+#include "acl.h"
+#include "xattr.h"
+#include <trace/events/f2fs.h>
+
+static unsigned long dir_blocks(struct inode *inode)
+{
+ return ((unsigned long long) (i_size_read(inode) + PAGE_SIZE - 1))
+ >> PAGE_SHIFT;
+}
+
+static unsigned int dir_buckets(unsigned int level, int dir_level)
+{
+ if (level + dir_level < MAX_DIR_HASH_DEPTH / 2)
+ return 1 << (level + dir_level);
+ else
+ return MAX_DIR_BUCKETS;
+}
+
+static unsigned int bucket_blocks(unsigned int level)
+{
+ if (level < MAX_DIR_HASH_DEPTH / 2)
+ return 2;
+ else
+ return 4;
+}
+
+static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = {
+ [F2FS_FT_UNKNOWN] = DT_UNKNOWN,
+ [F2FS_FT_REG_FILE] = DT_REG,
+ [F2FS_FT_DIR] = DT_DIR,
+ [F2FS_FT_CHRDEV] = DT_CHR,
+ [F2FS_FT_BLKDEV] = DT_BLK,
+ [F2FS_FT_FIFO] = DT_FIFO,
+ [F2FS_FT_SOCK] = DT_SOCK,
+ [F2FS_FT_SYMLINK] = DT_LNK,
+};
+
+static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = {
+ [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE,
+ [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR,
+ [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV,
+ [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV,
+ [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO,
+ [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK,
+ [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK,
+};
+
+void set_de_type(struct f2fs_dir_entry *de, umode_t mode)
+{
+ de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
+}
+
+unsigned char get_de_type(struct f2fs_dir_entry *de)
+{
+ if (de->file_type < F2FS_FT_MAX)
+ return f2fs_filetype_table[de->file_type];
+ return DT_UNKNOWN;
+}
+
+static unsigned long dir_block_index(unsigned int level,
+ int dir_level, unsigned int idx)
+{
+ unsigned long i;
+ unsigned long bidx = 0;
+
+ for (i = 0; i < level; i++)
+ bidx += dir_buckets(i, dir_level) * bucket_blocks(i);
+ bidx += idx * bucket_blocks(level);
+ return bidx;
+}
+
+static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
+ struct fscrypt_name *fname,
+ f2fs_hash_t namehash,
+ int *max_slots,
+ struct page **res_page)
+{
+ struct f2fs_dentry_block *dentry_blk;
+ struct f2fs_dir_entry *de;
+ struct f2fs_dentry_ptr d;
+
+ dentry_blk = (struct f2fs_dentry_block *)page_address(dentry_page);
+
+ make_dentry_ptr_block(NULL, &d, dentry_blk);
+ de = find_target_dentry(fname, namehash, max_slots, &d);
+ if (de)
+ *res_page = dentry_page;
+
+ return de;
+}
+
+struct f2fs_dir_entry *find_target_dentry(struct fscrypt_name *fname,
+ f2fs_hash_t namehash, int *max_slots,
+ struct f2fs_dentry_ptr *d)
+{
+ struct f2fs_dir_entry *de;
+ unsigned long bit_pos = 0;
+ int max_len = 0;
+
+ if (max_slots)
+ *max_slots = 0;
+ while (bit_pos < d->max) {
+ if (!test_bit_le(bit_pos, d->bitmap)) {
+ bit_pos++;
+ max_len++;
+ continue;
+ }
+
+ de = &d->dentry[bit_pos];
+
+ if (unlikely(!de->name_len)) {
+ bit_pos++;
+ continue;
+ }
+
+ if (de->hash_code == namehash &&
+ fscrypt_match_name(fname, d->filename[bit_pos],
+ le16_to_cpu(de->name_len)))
+ goto found;
+
+ if (max_slots && max_len > *max_slots)
+ *max_slots = max_len;
+ max_len = 0;
+
+ bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
+ }
+
+ de = NULL;
+found:
+ if (max_slots && max_len > *max_slots)
+ *max_slots = max_len;
+ return de;
+}
+
+static struct f2fs_dir_entry *find_in_level(struct inode *dir,
+ unsigned int level,
+ struct fscrypt_name *fname,
+ struct page **res_page)
+{
+ struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
+ int s = GET_DENTRY_SLOTS(name.len);
+ unsigned int nbucket, nblock;
+ unsigned int bidx, end_block;
+ struct page *dentry_page;
+ struct f2fs_dir_entry *de = NULL;
+ bool room = false;
+ int max_slots;
+ f2fs_hash_t namehash = f2fs_dentry_hash(&name, fname);
+
+ nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
+ nblock = bucket_blocks(level);
+
+ bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
+ le32_to_cpu(namehash) % nbucket);
+ end_block = bidx + nblock;
+
+ for (; bidx < end_block; bidx++) {
+ /* no need to allocate new dentry pages to all the indices */
+ dentry_page = find_data_page(dir, bidx);
+ if (IS_ERR(dentry_page)) {
+ if (PTR_ERR(dentry_page) == -ENOENT) {
+ room = true;
+ continue;
+ } else {
+ *res_page = dentry_page;
+ break;
+ }
+ }
+
+ de = find_in_block(dentry_page, fname, namehash, &max_slots,
+ res_page);
+ if (de)
+ break;
+
+ if (max_slots >= s)
+ room = true;
+ f2fs_put_page(dentry_page, 0);
+ }
+
+ if (!de && room && F2FS_I(dir)->chash != namehash) {
+ F2FS_I(dir)->chash = namehash;
+ F2FS_I(dir)->clevel = level;
+ }
+
+ return de;
+}
+
+struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir,
+ struct fscrypt_name *fname, struct page **res_page)
+{
+ unsigned long npages = dir_blocks(dir);
+ struct f2fs_dir_entry *de = NULL;
+ unsigned int max_depth;
+ unsigned int level;
+
+ if (f2fs_has_inline_dentry(dir)) {
+ *res_page = NULL;
+ de = find_in_inline_dir(dir, fname, res_page);
+ goto out;
+ }
+
+ if (npages == 0) {
+ *res_page = NULL;
+ goto out;
+ }
+
+ max_depth = F2FS_I(dir)->i_current_depth;
+ if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) {
+ f2fs_msg(F2FS_I_SB(dir)->sb, KERN_WARNING,
+ "Corrupted max_depth of %lu: %u",
+ dir->i_ino, max_depth);
+ max_depth = MAX_DIR_HASH_DEPTH;
+ f2fs_i_depth_write(dir, max_depth);
+ }
+
+ for (level = 0; level < max_depth; level++) {
+ *res_page = NULL;
+ de = find_in_level(dir, level, fname, res_page);
+ if (de || IS_ERR(*res_page))
+ break;
+ }
+out:
+ /* This is to increase the speed of f2fs_create */
+ if (!de)
+ F2FS_I(dir)->task = current;
+ return de;
+}
+
+/*
+ * Find an entry in the specified directory with the wanted name.
+ * It returns the page where the entry was found (as a parameter - res_page),
+ * and the entry itself. Page is returned mapped and unlocked.
+ * Entry is guaranteed to be valid.
+ */
+struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
+ const struct qstr *child, struct page **res_page)
+{
+ struct f2fs_dir_entry *de = NULL;
+ struct fscrypt_name fname;
+ int err;
+
+ err = fscrypt_setup_filename(dir, child, 1, &fname);
+ if (err) {
+ if (err == -ENOENT)
+ *res_page = NULL;
+ else
+ *res_page = ERR_PTR(err);
+ return NULL;
+ }
+
+ de = __f2fs_find_entry(dir, &fname, res_page);
+
+ fscrypt_free_filename(&fname);
+ return de;
+}
+
+struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
+{
+ struct qstr dotdot = QSTR_INIT("..", 2);
+
+ return f2fs_find_entry(dir, &dotdot, p);
+}
+
+ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr,
+ struct page **page)
+{
+ ino_t res = 0;
+ struct f2fs_dir_entry *de;
+
+ de = f2fs_find_entry(dir, qstr, page);
+ if (de) {
+ res = le32_to_cpu(de->ino);
+ f2fs_put_page(*page, 0);
+ }
+
+ return res;
+}
+
+void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
+ struct page *page, struct inode *inode)
+{
+ enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA;
+ lock_page(page);
+ f2fs_wait_on_page_writeback(page, type, true);
+ de->ino = cpu_to_le32(inode->i_ino);
+ set_de_type(de, inode->i_mode);
+ set_page_dirty(page);
+
+ dir->i_mtime = dir->i_ctime = current_time(dir);
+ f2fs_mark_inode_dirty_sync(dir, false);
+ f2fs_put_page(page, 1);
+}
+
+static void init_dent_inode(const struct qstr *name, struct page *ipage)
+{
+ struct f2fs_inode *ri;
+
+ f2fs_wait_on_page_writeback(ipage, NODE, true);
+
+ /* copy name info. to this inode page */
+ ri = F2FS_INODE(ipage);
+ ri->i_namelen = cpu_to_le32(name->len);
+ memcpy(ri->i_name, name->name, name->len);
+ set_page_dirty(ipage);
+}
+
+void do_make_empty_dir(struct inode *inode, struct inode *parent,
+ struct f2fs_dentry_ptr *d)
+{
+ struct qstr dot = QSTR_INIT(".", 1);
+ struct qstr dotdot = QSTR_INIT("..", 2);
+
+ /* update dirent of "." */
+ f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0);
+
+ /* update dirent of ".." */
+ f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1);
+}
+
+static int make_empty_dir(struct inode *inode,
+ struct inode *parent, struct page *page)
+{
+ struct page *dentry_page;
+ struct f2fs_dentry_block *dentry_blk;
+ struct f2fs_dentry_ptr d;
+
+ if (f2fs_has_inline_dentry(inode))
+ return make_empty_inline_dir(inode, parent, page);
+
+ dentry_page = get_new_data_page(inode, page, 0, true);
+ if (IS_ERR(dentry_page))
+ return PTR_ERR(dentry_page);
+
+ dentry_blk = page_address(dentry_page);
+
+ make_dentry_ptr_block(NULL, &d, dentry_blk);
+ do_make_empty_dir(inode, parent, &d);
+
+ set_page_dirty(dentry_page);
+ f2fs_put_page(dentry_page, 1);
+ return 0;
+}
+
+struct page *init_inode_metadata(struct inode *inode, struct inode *dir,
+ const struct qstr *new_name, const struct qstr *orig_name,
+ struct page *dpage)
+{
+ struct page *page;
+ int dummy_encrypt = DUMMY_ENCRYPTION_ENABLED(F2FS_I_SB(dir));
+ int err;
+
+ if (is_inode_flag_set(inode, FI_NEW_INODE)) {
+ page = new_inode_page(inode);
+ if (IS_ERR(page))
+ return page;
+
+ if (S_ISDIR(inode->i_mode)) {
+ /* in order to handle error case */
+ get_page(page);
+ err = make_empty_dir(inode, dir, page);
+ if (err) {
+ lock_page(page);
+ goto put_error;
+ }
+ put_page(page);
+ }
+
+ err = f2fs_init_acl(inode, dir, page, dpage);
+ if (err)
+ goto put_error;
+
+ err = f2fs_init_security(inode, dir, orig_name, page);
+ if (err)
+ goto put_error;
+
+ if ((f2fs_encrypted_inode(dir) || dummy_encrypt) &&
+ f2fs_may_encrypt(inode)) {
+ err = fscrypt_inherit_context(dir, inode, page, false);
+ if (err)
+ goto put_error;
+ }
+ } else {
+ page = get_node_page(F2FS_I_SB(dir), inode->i_ino);
+ if (IS_ERR(page))
+ return page;
+ }
+
+ if (new_name) {
+ init_dent_inode(new_name, page);
+ if (f2fs_encrypted_inode(dir))
+ file_set_enc_name(inode);
+ }
+
+ /*
+ * This file should be checkpointed during fsync.
+ * We lost i_pino from now on.
+ */
+ if (is_inode_flag_set(inode, FI_INC_LINK)) {
+ if (!S_ISDIR(inode->i_mode))
+ file_lost_pino(inode);
+ /*
+ * If link the tmpfile to alias through linkat path,
+ * we should remove this inode from orphan list.
+ */
+ if (inode->i_nlink == 0)
+ remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino);
+ f2fs_i_links_write(inode, true);
+ }
+ return page;
+
+put_error:
+ clear_nlink(inode);
+ update_inode(inode, page);
+ f2fs_put_page(page, 1);
+ return ERR_PTR(err);
+}
+
+void update_parent_metadata(struct inode *dir, struct inode *inode,
+ unsigned int current_depth)
+{
+ if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) {
+ if (S_ISDIR(inode->i_mode))
+ f2fs_i_links_write(dir, true);
+ clear_inode_flag(inode, FI_NEW_INODE);
+ }
+ dir->i_mtime = dir->i_ctime = current_time(dir);
+ f2fs_mark_inode_dirty_sync(dir, false);
+
+ if (F2FS_I(dir)->i_current_depth != current_depth)
+ f2fs_i_depth_write(dir, current_depth);
+
+ if (inode && is_inode_flag_set(inode, FI_INC_LINK))
+ clear_inode_flag(inode, FI_INC_LINK);
+}
+
+int room_for_filename(const void *bitmap, int slots, int max_slots)
+{
+ int bit_start = 0;
+ int zero_start, zero_end;
+next:
+ zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start);
+ if (zero_start >= max_slots)
+ return max_slots;
+
+ zero_end = find_next_bit_le(bitmap, max_slots, zero_start);
+ if (zero_end - zero_start >= slots)
+ return zero_start;
+
+ bit_start = zero_end + 1;
+
+ if (zero_end + 1 >= max_slots)
+ return max_slots;
+ goto next;
+}
+
+void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d,
+ const struct qstr *name, f2fs_hash_t name_hash,
+ unsigned int bit_pos)
+{
+ struct f2fs_dir_entry *de;
+ int slots = GET_DENTRY_SLOTS(name->len);
+ int i;
+
+ de = &d->dentry[bit_pos];
+ de->hash_code = name_hash;
+ de->name_len = cpu_to_le16(name->len);
+ memcpy(d->filename[bit_pos], name->name, name->len);
+ de->ino = cpu_to_le32(ino);
+ set_de_type(de, mode);
+ for (i = 0; i < slots; i++) {
+ __set_bit_le(bit_pos + i, (void *)d->bitmap);
+ /* avoid wrong garbage data for readdir */
+ if (i)
+ (de + i)->name_len = 0;
+ }
+}
+
+int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name,
+ const struct qstr *orig_name,
+ struct inode *inode, nid_t ino, umode_t mode)
+{
+ unsigned int bit_pos;
+ unsigned int level;
+ unsigned int current_depth;
+ unsigned long bidx, block;
+ f2fs_hash_t dentry_hash;
+ unsigned int nbucket, nblock;
+ struct page *dentry_page = NULL;
+ struct f2fs_dentry_block *dentry_blk = NULL;
+ struct f2fs_dentry_ptr d;
+ struct page *page = NULL;
+ int slots, err = 0;
+
+ level = 0;
+ slots = GET_DENTRY_SLOTS(new_name->len);
+ dentry_hash = f2fs_dentry_hash(new_name, NULL);
+
+ current_depth = F2FS_I(dir)->i_current_depth;
+ if (F2FS_I(dir)->chash == dentry_hash) {
+ level = F2FS_I(dir)->clevel;
+ F2FS_I(dir)->chash = 0;
+ }
+
+start:
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+ if (time_to_inject(F2FS_I_SB(dir), FAULT_DIR_DEPTH)) {
+ f2fs_show_injection_info(FAULT_DIR_DEPTH);
+ return -ENOSPC;
+ }
+#endif
+ if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
+ return -ENOSPC;
+
+ /* Increase the depth, if required */
+ if (level == current_depth)
+ ++current_depth;
+
+ nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
+ nblock = bucket_blocks(level);
+
+ bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
+ (le32_to_cpu(dentry_hash) % nbucket));
+
+ for (block = bidx; block <= (bidx + nblock - 1); block++) {
+ dentry_page = get_new_data_page(dir, NULL, block, true);
+ if (IS_ERR(dentry_page))
+ return PTR_ERR(dentry_page);
+
+ dentry_blk = page_address(dentry_page);
+ bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
+ slots, NR_DENTRY_IN_BLOCK);
+ if (bit_pos < NR_DENTRY_IN_BLOCK)
+ goto add_dentry;
+
+ f2fs_put_page(dentry_page, 1);
+ }
+
+ /* Move to next level to find the empty slot for new dentry */
+ ++level;
+ goto start;
+add_dentry:
+ f2fs_wait_on_page_writeback(dentry_page, DATA, true);
+
+ if (inode) {
+ down_write(&F2FS_I(inode)->i_sem);
+ page = init_inode_metadata(inode, dir, new_name,
+ orig_name, NULL);
+ if (IS_ERR(page)) {
+ err = PTR_ERR(page);
+ goto fail;
+ }
+ }
+
+ make_dentry_ptr_block(NULL, &d, dentry_blk);
+ f2fs_update_dentry(ino, mode, &d, new_name, dentry_hash, bit_pos);
+
+ set_page_dirty(dentry_page);
+
+ if (inode) {
+ f2fs_i_pino_write(inode, dir->i_ino);
+ f2fs_put_page(page, 1);
+ }
+
+ update_parent_metadata(dir, inode, current_depth);
+fail:
+ if (inode)
+ up_write(&F2FS_I(inode)->i_sem);
+
+ f2fs_put_page(dentry_page, 1);
+
+ return err;
+}
+
+int __f2fs_do_add_link(struct inode *dir, struct fscrypt_name *fname,
+ struct inode *inode, nid_t ino, umode_t mode)
+{
+ struct qstr new_name;
+ int err = -EAGAIN;
+
+ new_name.name = fname_name(fname);
+ new_name.len = fname_len(fname);
+
+ if (f2fs_has_inline_dentry(dir))
+ err = f2fs_add_inline_entry(dir, &new_name, fname->usr_fname,
+ inode, ino, mode);
+ if (err == -EAGAIN)
+ err = f2fs_add_regular_entry(dir, &new_name, fname->usr_fname,
+ inode, ino, mode);
+
+ f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
+ return err;
+}
+
+/*
+ * Caller should grab and release a rwsem by calling f2fs_lock_op() and
+ * f2fs_unlock_op().
+ */
+int __f2fs_add_link(struct inode *dir, const struct qstr *name,
+ struct inode *inode, nid_t ino, umode_t mode)
+{
+ struct fscrypt_name fname;
+ struct page *page = NULL;
+ struct f2fs_dir_entry *de = NULL;
+ int err;
+
+ err = fscrypt_setup_filename(dir, name, 0, &fname);
+ if (err)
+ return err;
+
+ /*
+ * An immature stakable filesystem shows a race condition between lookup
+ * and create. If we have same task when doing lookup and create, it's
+ * definitely fine as expected by VFS normally. Otherwise, let's just
+ * verify on-disk dentry one more time, which guarantees filesystem
+ * consistency more.
+ */
+ if (current != F2FS_I(dir)->task) {
+ de = __f2fs_find_entry(dir, &fname, &page);
+ F2FS_I(dir)->task = NULL;
+ }
+ if (de) {
+ f2fs_put_page(page, 0);
+ err = -EEXIST;
+ } else if (IS_ERR(page)) {
+ err = PTR_ERR(page);
+ } else {
+ err = __f2fs_do_add_link(dir, &fname, inode, ino, mode);
+ }
+ fscrypt_free_filename(&fname);
+ return err;
+}
+
+int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
+{
+ struct page *page;
+ int err = 0;
+
+ down_write(&F2FS_I(inode)->i_sem);
+ page = init_inode_metadata(inode, dir, NULL, NULL, NULL);
+ if (IS_ERR(page)) {
+ err = PTR_ERR(page);
+ goto fail;
+ }
+ f2fs_put_page(page, 1);
+
+ clear_inode_flag(inode, FI_NEW_INODE);
+fail:
+ up_write(&F2FS_I(inode)->i_sem);
+ f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
+ return err;
+}
+
+void f2fs_drop_nlink(struct inode *dir, struct inode *inode)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
+
+ down_write(&F2FS_I(inode)->i_sem);
+
+ if (S_ISDIR(inode->i_mode))
+ f2fs_i_links_write(dir, false);
+ inode->i_ctime = current_time(inode);
+
+ f2fs_i_links_write(inode, false);
+ if (S_ISDIR(inode->i_mode)) {
+ f2fs_i_links_write(inode, false);
+ f2fs_i_size_write(inode, 0);
+ }
+ up_write(&F2FS_I(inode)->i_sem);
+
+ if (inode->i_nlink == 0)
+ add_orphan_inode(inode);
+ else
+ release_orphan_inode(sbi);
+}
+
+/*
+ * It only removes the dentry from the dentry page, corresponding name
+ * entry in name page does not need to be touched during deletion.
+ */
+void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
+ struct inode *dir, struct inode *inode)
+{
+ struct f2fs_dentry_block *dentry_blk;
+ unsigned int bit_pos;
+ int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
+ struct address_space *mapping = page_mapping(page);
+ unsigned long flags;
+ int i;
+
+ f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
+
+ if (F2FS_OPTION(F2FS_I_SB(dir)).fsync_mode == FSYNC_MODE_STRICT)
+ add_ino_entry(F2FS_I_SB(dir), dir->i_ino, TRANS_DIR_INO);
+
+ if (f2fs_has_inline_dentry(dir))
+ return f2fs_delete_inline_entry(dentry, page, dir, inode);
+
+ lock_page(page);
+ f2fs_wait_on_page_writeback(page, DATA, true);
+
+ dentry_blk = page_address(page);
+ bit_pos = dentry - dentry_blk->dentry;
+ for (i = 0; i < slots; i++)
+ __clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
+
+ /* Let's check and deallocate this dentry page */
+ bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
+ NR_DENTRY_IN_BLOCK,
+ 0);
+ set_page_dirty(page);
+
+ dir->i_ctime = dir->i_mtime = current_time(dir);
+ f2fs_mark_inode_dirty_sync(dir, false);
+
+ if (inode)
+ f2fs_drop_nlink(dir, inode);
+
+ if (bit_pos == NR_DENTRY_IN_BLOCK &&
+ !truncate_hole(dir, page->index, page->index + 1)) {
+ spin_lock_irqsave(&mapping->tree_lock, flags);
+ radix_tree_tag_clear(&mapping->page_tree, page_index(page),
+ PAGECACHE_TAG_DIRTY);
+ spin_unlock_irqrestore(&mapping->tree_lock, flags);
+
+ clear_page_dirty_for_io(page);
+ ClearPagePrivate(page);
+ ClearPageUptodate(page);
+ clear_cold_data(page);
+ inode_dec_dirty_pages(dir);
+ remove_dirty_inode(dir);
+ }
+ f2fs_put_page(page, 1);
+}
+
+bool f2fs_empty_dir(struct inode *dir)
+{
+ unsigned long bidx;
+ struct page *dentry_page;
+ unsigned int bit_pos;
+ struct f2fs_dentry_block *dentry_blk;
+ unsigned long nblock = dir_blocks(dir);
+
+ if (f2fs_has_inline_dentry(dir))
+ return f2fs_empty_inline_dir(dir);
+
+ for (bidx = 0; bidx < nblock; bidx++) {
+ dentry_page = get_lock_data_page(dir, bidx, false);
+ if (IS_ERR(dentry_page)) {
+ if (PTR_ERR(dentry_page) == -ENOENT)
+ continue;
+ else
+ return false;
+ }
+
+ dentry_blk = page_address(dentry_page);
+ if (bidx == 0)
+ bit_pos = 2;
+ else
+ bit_pos = 0;
+ bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
+ NR_DENTRY_IN_BLOCK,
+ bit_pos);
+
+ f2fs_put_page(dentry_page, 1);
+
+ if (bit_pos < NR_DENTRY_IN_BLOCK)
+ return false;
+ }
+ return true;
+}
+
+int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
+ unsigned int start_pos, struct fscrypt_str *fstr)
+{
+ unsigned char d_type = DT_UNKNOWN;
+ unsigned int bit_pos;
+ struct f2fs_dir_entry *de = NULL;
+ struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
+ struct f2fs_sb_info *sbi = F2FS_I_SB(d->inode);
+
+ bit_pos = ((unsigned long)ctx->pos % d->max);
+
+ while (bit_pos < d->max) {
+ bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos);
+ if (bit_pos >= d->max)
+ break;
+
+ de = &d->dentry[bit_pos];
+ if (de->name_len == 0) {
+ bit_pos++;
+ ctx->pos = start_pos + bit_pos;
+ continue;
+ }
+
+ d_type = get_de_type(de);
+
+ de_name.name = d->filename[bit_pos];
+ de_name.len = le16_to_cpu(de->name_len);
+
+ /* check memory boundary before moving forward */
+ bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
+ if (unlikely(bit_pos > d->max ||
+ le16_to_cpu(de->name_len) > F2FS_NAME_LEN)) {
+ f2fs_msg(F2FS_I_SB(d->inode)->sb, KERN_WARNING,
+ "%s: corrupted namelen=%d, run fsck to fix.",
+ __func__, le16_to_cpu(de->name_len));
+ set_sbi_flag(F2FS_I_SB(d->inode)->sb->s_fs_info, SBI_NEED_FSCK);
+ return -EINVAL;
+ }
+
+ if (f2fs_encrypted_inode(d->inode)) {
+ int save_len = fstr->len;
+ int err;
+
+ err = fscrypt_fname_disk_to_usr(d->inode,
+ (u32)de->hash_code, 0,
+ &de_name, fstr);
+ if (err)
+ return err;
+
+ de_name = *fstr;
+ fstr->len = save_len;
+ }
+
+ if (!dir_emit(ctx, de_name.name, de_name.len,
+ le32_to_cpu(de->ino), d_type))
+ return 1;
+
+ if (sbi->readdir_ra == 1)
+ ra_node_page(sbi, le32_to_cpu(de->ino));
+
+ ctx->pos = start_pos + bit_pos;
+ }
+ return 0;
+}
+
+static int f2fs_readdir(struct file *file, struct dir_context *ctx)
+{
+ struct inode *inode = file_inode(file);
+ unsigned long npages = dir_blocks(inode);
+ struct f2fs_dentry_block *dentry_blk = NULL;
+ struct page *dentry_page = NULL;
+ struct file_ra_state *ra = &file->f_ra;
+ loff_t start_pos = ctx->pos;
+ unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
+ struct f2fs_dentry_ptr d;
+ struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
+ int err = 0;
+
+ if (f2fs_encrypted_inode(inode)) {
+ err = fscrypt_get_encryption_info(inode);
+ if (err && err != -ENOKEY)
+ goto out;
+
+ err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr);
+ if (err < 0)
+ goto out;
+ }
+
+ if (f2fs_has_inline_dentry(inode)) {
+ err = f2fs_read_inline_dir(file, ctx, &fstr);
+ goto out_free;
+ }
+
+ for (; n < npages; n++, ctx->pos = n * NR_DENTRY_IN_BLOCK) {
+
+ /* allow readdir() to be interrupted */
+ if (fatal_signal_pending(current)) {
+ err = -ERESTARTSYS;
+ goto out_free;
+ }
+ cond_resched();
+
+ /* readahead for multi pages of dir */
+ if (npages - n > 1 && !ra_has_index(ra, n))
+ page_cache_sync_readahead(inode->i_mapping, ra, file, n,
+ min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
+
+ dentry_page = get_lock_data_page(inode, n, false);
+ if (IS_ERR(dentry_page)) {
+ err = PTR_ERR(dentry_page);
+ if (err == -ENOENT) {
+ err = 0;
+ continue;
+ } else {
+ goto out_free;
+ }
+ }
+
+ dentry_blk = page_address(dentry_page);
+
+ make_dentry_ptr_block(inode, &d, dentry_blk);
+
+ err = f2fs_fill_dentries(ctx, &d,
+ n * NR_DENTRY_IN_BLOCK, &fstr);
+ if (err) {
+ f2fs_put_page(dentry_page, 1);
+ break;
+ }
+
+ f2fs_put_page(dentry_page, 1);
+ }
+out_free:
+ fscrypt_fname_free_buffer(&fstr);
+out:
+ trace_f2fs_readdir(inode, start_pos, ctx->pos, err);
+ return err < 0 ? err : 0;
+}
+
+static int f2fs_dir_open(struct inode *inode, struct file *filp)
+{
+ if (f2fs_encrypted_inode(inode))
+ return fscrypt_get_encryption_info(inode) ? -EACCES : 0;
+ return 0;
+}
+
+const struct file_operations f2fs_dir_operations = {
+ .llseek = generic_file_llseek,
+ .read = generic_read_dir,
+ .iterate_shared = f2fs_readdir,
+ .fsync = f2fs_sync_file,
+ .open = f2fs_dir_open,
+ .unlocked_ioctl = f2fs_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = f2fs_compat_ioctl,
+#endif
+};