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f2fs: fix to avoid race when accessing last_disk_size

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last_disk_size could be wrong due to concurrently updating, so using
i_sem semaphore to make last_disk_size updating exclusive to fix this
issue.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2017-10-09 17:55:19 +08:00
committed by Jaegeuk Kim
parent ebf7c522fd
commit a0d00fad35
3 changed files with 15 additions and 2 deletions
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4
fs/f2fs/file.c
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@@ -777,6 +777,10 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
inode->i_mtime = inode->i_ctime = current_time(inode);
}
down_write(&F2FS_I(inode)->i_sem);
F2FS_I(inode)->last_disk_size = i_size_read(inode);
up_write(&F2FS_I(inode)->i_sem);
size_changed = true;
}