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f2fs: convert inline_dir early before starting rename 

If we hit an error during rename, we'll get two dentries in different
directories.

Chao adds to check the room in inline_dir which can avoid needless
inversion. This should be done by inode_lock(&old_dir).

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
alistair/sensors
Jaegeuk Kim 2019-12-09 19:03:05 -08:00
parent fe396ad8e7
commit b06af2aff2
4 changed files with 71 additions and 25 deletions
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14
fs/f2fs/dir.c
View File

@ -578,6 +578,20 @@ next:
goto next;
}
bool f2fs_has_enough_room(struct inode *dir, struct page *ipage,
struct fscrypt_name *fname)
{
struct f2fs_dentry_ptr d;
unsigned int bit_pos;
int slots = GET_DENTRY_SLOTS(fname_len(fname));
make_dentry_ptr_inline(dir, &d, inline_data_addr(dir, ipage));
bit_pos = f2fs_room_for_filename(d.bitmap, slots, d.max);
return bit_pos < d.max;
}
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)

3
fs/f2fs/f2fs.h
View File

@ -3107,6 +3107,8 @@ ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr,
struct page **page);
void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
struct page *page, struct inode *inode);
bool f2fs_has_enough_room(struct inode *dir, struct page *ipage,
struct fscrypt_name *fname);
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);
@ -3649,6 +3651,7 @@ void f2fs_truncate_inline_inode(struct inode *inode,
int f2fs_read_inline_data(struct inode *inode, struct page *page);
int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page);
int f2fs_convert_inline_inode(struct inode *inode);
int f2fs_try_convert_inline_dir(struct inode *dir, struct dentry *dentry);
int f2fs_write_inline_data(struct inode *inode, struct page *page);
bool f2fs_recover_inline_data(struct inode *inode, struct page *npage);
struct f2fs_dir_entry *f2fs_find_in_inline_dir(struct inode *dir,

42
fs/f2fs/inline.c
View File

@ -530,7 +530,7 @@ recover:
return err;
}
static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
static int do_convert_inline_dir(struct inode *dir, struct page *ipage,
void *inline_dentry)
{
if (!F2FS_I(dir)->i_dir_level)
@ -539,6 +539,44 @@ static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
return f2fs_move_rehashed_dirents(dir, ipage, inline_dentry);
}
int f2fs_try_convert_inline_dir(struct inode *dir, struct dentry *dentry)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
struct page *ipage;
struct fscrypt_name fname;
void *inline_dentry = NULL;
int err = 0;
if (!f2fs_has_inline_dentry(dir))
return 0;
f2fs_lock_op(sbi);
err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &fname);
if (err)
goto out;
ipage = f2fs_get_node_page(sbi, dir->i_ino);
if (IS_ERR(ipage)) {
err = PTR_ERR(ipage);
goto out;
}
if (f2fs_has_enough_room(dir, ipage, &fname)) {
f2fs_put_page(ipage, 1);
goto out;
}
inline_dentry = inline_data_addr(dir, ipage);
err = do_convert_inline_dir(dir, ipage, inline_dentry);
if (!err)
f2fs_put_page(ipage, 1);
out:
f2fs_unlock_op(sbi);
return err;
}
int f2fs_add_inline_entry(struct inode *dir, const struct qstr *new_name,
const struct qstr *orig_name,
struct inode *inode, nid_t ino, umode_t mode)
@ -562,7 +600,7 @@ int f2fs_add_inline_entry(struct inode *dir, const struct qstr *new_name,
bit_pos = f2fs_room_for_filename(d.bitmap, slots, d.max);
if (bit_pos >= d.max) {
err = f2fs_convert_inline_dir(dir, ipage, inline_dentry);
err = do_convert_inline_dir(dir, ipage, inline_dentry);
if (err)
return err;
err = -EAGAIN;

37
fs/f2fs/namei.c
View File

@ -906,7 +906,6 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct f2fs_dir_entry *old_dir_entry = NULL;
struct f2fs_dir_entry *old_entry;
struct f2fs_dir_entry *new_entry;
bool is_old_inline = f2fs_has_inline_dentry(old_dir);
int err;
if (unlikely(f2fs_cp_error(sbi)))
@ -919,6 +918,20 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
F2FS_I(old_dentry->d_inode)->i_projid)))
return -EXDEV;
/*
* If new_inode is null, the below renaming flow will
* add a link in old_dir which can conver inline_dir.
* After then, if we failed to get the entry due to other
* reasons like ENOMEM, we had to remove the new entry.
* Instead of adding such the error handling routine, let's
* simply convert first here.
*/
if (old_dir == new_dir && !new_inode) {
err = f2fs_try_convert_inline_dir(old_dir, new_dentry);
if (err)
return err;
}
if (flags & RENAME_WHITEOUT) {
err = f2fs_create_whiteout(old_dir, &whiteout);
if (err)
@ -1006,28 +1019,6 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (old_dir_entry)
f2fs_i_links_write(new_dir, true);
/*
* old entry and new entry can locate in the same inline
* dentry in inode, when attaching new entry in inline dentry,
* it could force inline dentry conversion, after that,
* old_entry and old_page will point to wrong address, in
* order to avoid this, let's do the check and update here.
*/
if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
f2fs_put_page(old_page, 0);
old_page = NULL;
old_entry = f2fs_find_entry(old_dir,
&old_dentry->d_name, &old_page);
if (!old_entry) {
err = -ENOENT;
if (IS_ERR(old_page))
err = PTR_ERR(old_page);
f2fs_unlock_op(sbi);
goto out_dir;
}
}
}
down_write(&F2FS_I(old_inode)->i_sem);