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authorJaegeuk Kim <jaegeuk.kim@samsung.com>2013-04-30 06:33:27 +0400
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-05-08 14:54:08 +0400
commit531ad7d58c6476c5856653448b4c7d26427502b4 (patch)
tree6b890195ebfd773fa55ec580ce2248a2a47d5452 /fs/f2fs/namei.c
parentac5d156c78a68b39955ee9b09498ba93831c77d7 (diff)
downloadlinux-531ad7d58c6476c5856653448b4c7d26427502b4.tar.xz
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.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 4aa26e53c935..47abc9722b17 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;