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Subject[f2fs-dev] [PATCH] f2fs: use inode mutex to keep atomicity of f2fs_falloc
Date
Previously without protection of inode mutex, f2fs_falloc and other data
correlated operations will interfere with each other.
So let's use inode mutex to keep atomicity of f2fs_falloc.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
---
fs/f2fs/file.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 85e91ca..ece380f 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -559,6 +559,8 @@ static long f2fs_fallocate(struct file *file, int mode,
if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
return -EOPNOTSUPP;

+ mutex_lock(&inode->i_mutex);
+
if (mode & FALLOC_FL_PUNCH_HOLE)
ret = punch_hole(inode, offset, len);
else
@@ -568,6 +570,9 @@ static long f2fs_fallocate(struct file *file, int mode,
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(inode);
}
+
+ mutex_unlock(&inode->i_mutex);
+
trace_f2fs_fallocate(inode, mode, offset, len, ret);
return ret;
}
--
1.7.9.5


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