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authorYunlei He <heyunlei@huawei.com>2017-09-07 10:40:54 +0800
committerJaegeuk Kim <jaegeuk@kernel.org>2017-09-07 20:57:20 -0700
commit27161f13e3c3241944846ac24942a85cceda0a2c (patch)
treebdd36b6171f9d48fd4a3c68c6f091697bb4cfaba /fs/f2fs/xattr.c
parent13ba41e346170e594b7ce582561b3efa5b85f18f (diff)
downloadlinux-27161f13e3c3241944846ac24942a85cceda0a2c.tar.bz2
f2fs: avoid race in between read xattr & write xattr
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>
Diffstat (limited to 'fs/f2fs/xattr.c')
-rw-r--r--fs/f2fs/xattr.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
index ef3a3721ea6b..7c65540148f8 100644
--- a/fs/f2fs/xattr.c
+++ b/fs/f2fs/xattr.c
@@ -473,8 +473,10 @@ int f2fs_getxattr(struct inode *inode, int index, const char *name,
if (len > F2FS_NAME_LEN)
return -ERANGE;
+ down_read(&F2FS_I(inode)->i_xattr_sem);
error = lookup_all_xattrs(inode, ipage, index, len, name,
&entry, &base_addr);
+ up_read(&F2FS_I(inode)->i_xattr_sem);
if (error)
return error;
@@ -503,7 +505,9 @@ ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
int error = 0;
size_t rest = buffer_size;
+ down_read(&F2FS_I(inode)->i_xattr_sem);
error = read_all_xattrs(inode, NULL, &base_addr);
+ up_read(&F2FS_I(inode)->i_xattr_sem);
if (error)
return error;
@@ -686,7 +690,9 @@ int f2fs_setxattr(struct inode *inode, int index, const char *name,
f2fs_lock_op(sbi);
/* protect xattr_ver */
down_write(&F2FS_I(inode)->i_sem);
+ down_write(&F2FS_I(inode)->i_xattr_sem);
err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
+ up_write(&F2FS_I(inode)->i_xattr_sem);
up_write(&F2FS_I(inode)->i_sem);
f2fs_unlock_op(sbi);