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f2fs: fix double lock in handle_failed_inode

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In handle_failed_inode, there is a potential deadlock which can happen
in below call path:

- f2fs_create
 - f2fs_lock_op   down_read(cp_rwsem)
 - f2fs_add_link
  - __f2fs_add_link
   - init_inode_metadata
    - f2fs_init_security    failed
    - truncate_blocks    failed
 - handle_failed_inode
  - f2fs_truncate
   - truncate_blocks(..,true)
					- write_checkpoint
					 - block_operations
					  - f2fs_lock_all  down_write(cp_rwsem)
    - f2fs_lock_op   down_read(cp_rwsem)

So in this path, we pass parameter to f2fs_truncate to make sure
cp_rwsem in truncate_blocks will not be locked again.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2015-07-16 18:19:02 +08:00 committed by Jaegeuk Kim
parent ecbaa4068f
commit 55f57d2c42
4 changed files with 7 additions and 7 deletions
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2
fs/f2fs/f2fs.h
View file

@ -1579,7 +1579,7 @@ static inline bool f2fs_may_extent_tree(struct inode *inode)
int f2fs_sync_file(struct file *, loff_t, loff_t, int);
void truncate_data_blocks(struct dnode_of_data *);
int truncate_blocks(struct inode *, u64, bool);
void f2fs_truncate(struct inode *);
void f2fs_truncate(struct inode *, bool);
int f2fs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
int f2fs_setattr(struct dentry *, struct iattr *);
int truncate_hole(struct inode *, pgoff_t, pgoff_t);

6
fs/f2fs/file.c
View file

@ -579,7 +579,7 @@ int truncate_blocks(struct inode *inode, u64 from, bool lock)
return err;
}
void f2fs_truncate(struct inode *inode)
void f2fs_truncate(struct inode *inode, bool lock)
{
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
S_ISLNK(inode->i_mode)))
@ -593,7 +593,7 @@ void f2fs_truncate(struct inode *inode)
return;
}
if (!truncate_blocks(inode, i_size_read(inode), true)) {
if (!truncate_blocks(inode, i_size_read(inode), lock)) {
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(inode);
}
@ -656,7 +656,7 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
if (attr->ia_size <= i_size_read(inode)) {
truncate_setsize(inode, attr->ia_size);
f2fs_truncate(inode);
f2fs_truncate(inode, true);
f2fs_balance_fs(F2FS_I_SB(inode));
} else {
/*

4
fs/f2fs/inode.c
View file

@ -343,7 +343,7 @@ void f2fs_evict_inode(struct inode *inode)
i_size_write(inode, 0);
if (F2FS_HAS_BLOCKS(inode))
f2fs_truncate(inode);
f2fs_truncate(inode, true);
f2fs_lock_op(sbi);
remove_inode_page(inode);
@ -385,7 +385,7 @@ void handle_failed_inode(struct inode *inode)
i_size_write(inode, 0);
if (F2FS_HAS_BLOCKS(inode))
f2fs_truncate(inode);
f2fs_truncate(inode, false);
remove_inode_page(inode);

2
fs/f2fs/super.c
View file

@ -467,7 +467,7 @@ static int f2fs_drop_inode(struct inode *inode)
i_size_write(inode, 0);
if (F2FS_HAS_BLOCKS(inode))
f2fs_truncate(inode);
f2fs_truncate(inode, true);
sb_end_intwrite(inode->i_sb);