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ext4: let ext4_rename handle inline dir 

In case we rename a directory, ext4_rename has to read the dir block
and change its dotdot's information.  The old ext4_rename encapsulated
the dir_block read into itself.  So this patch adds a new function
ext4_get_first_dir_block() which gets the dir buffer information so
the ext4_rename can handle it properly.  As it will also change the
parent inode number, we return the parent_de so that ext4_rename() can
handle it more easily.

ext4_find_entry is also changed so that the caller(rename) can tell
whether the found entry is an inlined one or not and journaling the
corresponding buffer head.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Tao Ma 2012-12-10 14:06:01 -05:00 committed by Theodore Ts'o
parent 61f86638d8
commit 32f7f22c0b
3 changed files with 100 additions and 35 deletions
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15
fs/ext4/inline.c
View File

@ -1424,6 +1424,21 @@ out:
return ret;
}
struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
struct ext4_dir_entry_2 **parent_de,
int *retval)
{
struct ext4_iloc iloc;
*retval = ext4_get_inode_loc(inode, &iloc);
if (*retval)
return NULL;
*parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
return iloc.bh;
}
/*
* Try to create the inline data for the new dir.
* If it succeeds, return 0, otherwise return the error.

109
fs/ext4/namei.c
View File

@ -1176,7 +1176,8 @@ static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block,
*/
static struct buffer_head * ext4_find_entry (struct inode *dir,
const struct qstr *d_name,
struct ext4_dir_entry_2 ** res_dir)
struct ext4_dir_entry_2 **res_dir,
int *inlined)
{
struct super_block *sb;
struct buffer_head *bh_use[NAMEI_RA_SIZE];
@ -1202,8 +1203,11 @@ static struct buffer_head * ext4_find_entry (struct inode *dir,
int has_inline_data = 1;
ret = ext4_find_inline_entry(dir, d_name, res_dir,
&has_inline_data);
if (has_inline_data)
if (has_inline_data) {
if (inlined)
*inlined = 1;
return ret;
}
}
if ((namelen <= 2) && (name[0] == '.') &&
@ -1390,7 +1394,7 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
if (dentry->d_name.len > EXT4_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
bh = ext4_find_entry(dir, &dentry->d_name, &de);
bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
inode = NULL;
if (bh) {
__u32 ino = le32_to_cpu(de->inode);
@ -1424,7 +1428,7 @@ struct dentry *ext4_get_parent(struct dentry *child)
struct ext4_dir_entry_2 * de;
struct buffer_head *bh;
bh = ext4_find_entry(child->d_inode, &dotdot, &de);
bh = ext4_find_entry(child->d_inode, &dotdot, &de, NULL);
if (!bh)
return ERR_PTR(-ENOENT);
ino = le32_to_cpu(de->inode);
@ -2725,7 +2729,7 @@ static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
return PTR_ERR(handle);
retval = -ENOENT;
bh = ext4_find_entry(dir, &dentry->d_name, &de);
bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
if (!bh)
goto end_rmdir;
@ -2790,7 +2794,7 @@ static int ext4_unlink(struct inode *dir, struct dentry *dentry)
ext4_handle_sync(handle);
retval = -ENOENT;
bh = ext4_find_entry(dir, &dentry->d_name, &de);
bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
if (!bh)
goto end_unlink;
@ -2972,8 +2976,39 @@ retry:
return err;
}
#define PARENT_INO(buffer, size) \
(ext4_next_entry((struct ext4_dir_entry_2 *)(buffer), size)->inode)
/*
* Try to find buffer head where contains the parent block.
* It should be the inode block if it is inlined or the 1st block
* if it is a normal dir.
*/
static struct buffer_head *ext4_get_first_dir_block(handle_t *handle,
struct inode *inode,
int *retval,
struct ext4_dir_entry_2 **parent_de,
int *inlined)
{
struct buffer_head *bh;
if (!ext4_has_inline_data(inode)) {
if (!(bh = ext4_bread(handle, inode, 0, 0, retval))) {
if (!*retval) {
*retval = -EIO;
ext4_error(inode->i_sb,
"Directory hole detected on inode %lu\n",
inode->i_ino);
}
return NULL;
}
*parent_de = ext4_next_entry(
(struct ext4_dir_entry_2 *)bh->b_data,
inode->i_sb->s_blocksize);
return bh;
}
*inlined = 1;
return ext4_get_first_inline_block(inode, parent_de, retval);
}
/*
* Anybody can rename anything with this: the permission checks are left to the
@ -2987,6 +3022,8 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
struct buffer_head *old_bh, *new_bh, *dir_bh;
struct ext4_dir_entry_2 *old_de, *new_de;
int retval, force_da_alloc = 0;
int inlined = 0, new_inlined = 0;
struct ext4_dir_entry_2 *parent_de;
dquot_initialize(old_dir);
dquot_initialize(new_dir);
@ -3006,7 +3043,7 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
ext4_handle_sync(handle);
old_bh = ext4_find_entry(old_dir, &old_dentry->d_name, &old_de);
old_bh = ext4_find_entry(old_dir, &old_dentry->d_name, &old_de, NULL);
/*
* Check for inode number is _not_ due to possible IO errors.
* We might rmdir the source, keep it as pwd of some process
@ -3019,7 +3056,8 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
goto end_rename;
new_inode = new_dentry->d_inode;
new_bh = ext4_find_entry(new_dir, &new_dentry->d_name, &new_de);
new_bh = ext4_find_entry(new_dir, &new_dentry->d_name,
&new_de, &new_inlined);
if (new_bh) {
if (!new_inode) {
brelse(new_bh);
@ -3033,22 +3071,17 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
goto end_rename;
}
retval = -EIO;
if (!(dir_bh = ext4_bread(handle, old_inode, 0, 0, &retval))) {
if (!retval) {
retval = -EIO;
ext4_error(old_inode->i_sb,
"Directory hole detected on inode %lu\n",
old_inode->i_ino);
}
dir_bh = ext4_get_first_dir_block(handle, old_inode,
&retval, &parent_de,
&inlined);
if (!dir_bh)
goto end_rename;
}
if (!buffer_verified(dir_bh) &&
if (!inlined && !buffer_verified(dir_bh) &&
!ext4_dirent_csum_verify(old_inode,
(struct ext4_dir_entry *)dir_bh->b_data))
goto end_rename;
set_buffer_verified(dir_bh);
if (le32_to_cpu(PARENT_INO(dir_bh->b_data,
old_dir->i_sb->s_blocksize)) != old_dir->i_ino)
if (le32_to_cpu(parent_de->inode) != old_dir->i_ino)
goto end_rename;
retval = -EMLINK;
if (!new_inode && new_dir != old_dir &&
@ -3077,10 +3110,13 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
ext4_current_time(new_dir);
ext4_mark_inode_dirty(handle, new_dir);
BUFFER_TRACE(new_bh, "call ext4_handle_dirty_metadata");
retval = ext4_handle_dirty_dirent_node(handle, new_dir, new_bh);
if (unlikely(retval)) {
ext4_std_error(new_dir->i_sb, retval);
goto end_rename;
if (!new_inlined) {
retval = ext4_handle_dirty_dirent_node(handle,
new_dir, new_bh);
if (unlikely(retval)) {
ext4_std_error(new_dir->i_sb, retval);
goto end_rename;
}
}
brelse(new_bh);
new_bh = NULL;
@ -3108,7 +3144,8 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
struct buffer_head *old_bh2;
struct ext4_dir_entry_2 *old_de2;
old_bh2 = ext4_find_entry(old_dir, &old_dentry->d_name, &old_de2);
old_bh2 = ext4_find_entry(old_dir, &old_dentry->d_name,
&old_de2, NULL);
if (old_bh2) {
retval = ext4_delete_entry(handle, old_dir,
old_de2, old_bh2);
@ -3128,17 +3165,19 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
old_dir->i_ctime = old_dir->i_mtime = ext4_current_time(old_dir);
ext4_update_dx_flag(old_dir);
if (dir_bh) {
PARENT_INO(dir_bh->b_data, new_dir->i_sb->s_blocksize) =
cpu_to_le32(new_dir->i_ino);
parent_de->inode = cpu_to_le32(new_dir->i_ino);
BUFFER_TRACE(dir_bh, "call ext4_handle_dirty_metadata");
if (is_dx(old_inode)) {
retval = ext4_handle_dirty_dx_node(handle,
old_inode,
dir_bh);
if (!inlined) {
if (is_dx(old_inode)) {
retval = ext4_handle_dirty_dx_node(handle,
old_inode,
dir_bh);
} else {
retval = ext4_handle_dirty_dirent_node(handle,
old_inode, dir_bh);
}
} else {
retval = ext4_handle_dirty_dirent_node(handle,
old_inode,
dir_bh);
retval = ext4_mark_inode_dirty(handle, old_inode);
}
if (retval) {
ext4_std_error(old_dir->i_sb, retval);

11
fs/ext4/xattr.h
View File

@ -181,6 +181,9 @@ extern int ext4_delete_inline_entry(handle_t *handle,
struct buffer_head *bh,
int *has_inline_data);
extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
struct ext4_dir_entry_2 **parent_de,
int *retval);
# else /* CONFIG_EXT4_FS_XATTR */
static inline int
@ -387,6 +390,14 @@ static inline int empty_inline_dir(struct inode *dir, int *has_inline_data)
{
return 0;
}
static inline struct buffer_head *
ext4_get_first_inline_block(struct inode *inode,
struct ext4_dir_entry_2 **parent_de,
int *retval)
{
return NULL;
}
# endif /* CONFIG_EXT4_FS_XATTR */
#ifdef CONFIG_EXT4_FS_SECURITY