f2fs: avoid race in between read xattr & write xattr

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Thread A:					Thread B:
-f2fs_getxattr
   -lookup_all_xattrs
      -xnid = F2FS_I(inode)->i_xattr_nid;
						-f2fs_setxattr
						    -__f2fs_setxattr
						        -write_all_xattrs
						            -truncate_xattr_node
							          ...  ...
						-write_checkpoint
								  ...  ...
						-alloc_nid   <- nid reuse
          -get_node_page
              -f2fs_bug_on  <- nid != node_footer->nid

It's need a rw_sem to avoid the race

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

...

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Yunlei He 2017-09-07 10:40:54 +08:00 • committed by Jaegeuk Kim

parent 13ba41e346

commit 27161f13e3

3 changed files with 8 additions and 0 deletions

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1

fs/f2fs/f2fs.h

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1

fs/f2fs/super.c

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6

fs/f2fs/xattr.c

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