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| author | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2013-04-30 11:33:27 +0900 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2013-05-08 19:54:08 +0900 |
| commit | 531ad7d58c6476c5856653448b4c7d26427502b4 (patch) | |
| tree | 6b890195ebfd773fa55ec580ce2248a2a47d5452 /fs/f2fs/namei.c | |
| parent | ac5d156c78a68b39955ee9b09498ba93831c77d7 (diff) | |
| download | op-kernel-dev-531ad7d58c6476c5856653448b4c7d26427502b4.zip op-kernel-dev-531ad7d58c6476c5856653448b4c7d26427502b4.tar.gz | |
f2fs: avoid deadlock during evict after f2fs_gc
o Deadlock case #1
Thread 1:
- writeback_sb_inodes
- do_writepages
- f2fs_write_data_pages
- write_cache_pages
- f2fs_write_data_page
- f2fs_balance_fs
- wait mutex_lock(gc_mutex)
Thread 2:
- f2fs_balance_fs
- mutex_lock(gc_mutex)
- f2fs_gc
- f2fs_iget
- wait iget_locked(inode->i_lock)
Thread 3:
- do_unlinkat
- iput
- lock(inode->i_lock)
- evict
- inode_wait_for_writeback
o Deadlock case #2
Thread 1:
- __writeback_single_inode
: set I_SYNC
- do_writepages
- f2fs_write_data_page
- f2fs_balance_fs
- f2fs_gc
- iput
- evict
- inode_wait_for_writeback(I_SYNC)
In order to avoid this, even though iput is called with the zero-reference
count, we need to stop the eviction procedure if the inode is on writeback.
So this patch links f2fs_drop_inode which checks the I_SYNC flag.
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/namei.c')
| -rw-r--r-- | fs/f2fs/namei.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c index 4aa26e5..47abc97 100644 --- a/fs/f2fs/namei.c +++ b/fs/f2fs/namei.c @@ -72,6 +72,7 @@ out: unlock_new_inode(inode); fail: trace_f2fs_new_inode(inode, err); + make_bad_inode(inode); iput(inode); if (nid_free) alloc_nid_failed(sbi, ino); @@ -155,6 +156,7 @@ static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode, out: clear_nlink(inode); unlock_new_inode(inode); + make_bad_inode(inode); iput(inode); alloc_nid_failed(sbi, ino); return err; @@ -190,6 +192,7 @@ static int f2fs_link(struct dentry *old_dentry, struct inode *dir, return 0; out: clear_inode_flag(F2FS_I(inode), FI_INC_LINK); + make_bad_inode(inode); iput(inode); return err; } @@ -295,6 +298,7 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry, out: clear_nlink(inode); unlock_new_inode(inode); + make_bad_inode(inode); iput(inode); alloc_nid_failed(sbi, inode->i_ino); return err; @@ -335,6 +339,7 @@ out_fail: clear_inode_flag(F2FS_I(inode), FI_INC_LINK); clear_nlink(inode); unlock_new_inode(inode); + make_bad_inode(inode); iput(inode); alloc_nid_failed(sbi, inode->i_ino); return err; @@ -382,6 +387,7 @@ static int f2fs_mknod(struct inode *dir, struct dentry *dentry, out: clear_nlink(inode); unlock_new_inode(inode); + make_bad_inode(inode); iput(inode); alloc_nid_failed(sbi, inode->i_ino); return err; |
