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authorSheng Yong <shengyong1@huawei.com>2018-03-15 18:51:41 +0800
committerJaegeuk Kim <jaegeuk@kernel.org>2018-03-17 14:02:47 +0900
commitb7c409deda6bcaaa6452b015937a013dd8b481b4 (patch)
tree5da0435f1eb10a51ff068c2793dac3512bb6778d /fs/f2fs/super.c
parentda5ce874f8cabe18bc34b50856933108830663bc (diff)
f2fs: introduce F2FS_FEATURE_LOST_FOUND feature
This patch introduces a new feature, F2FS_FEATURE_LOST_FOUND, which is set by mkfs. mkfs creates a directory named lost+found, which saves unreachable files. If fsck finds a file which has no parent, or its parent is removed by fsck, the file will be placed under lost+found directory by fsck. lost+found directory could not be encrypted. As a result, the root directory cannot be encrypted too. So if LOST_FOUND feature is enabled, let's avoid to encrypt root directory. Signed-off-by: Sheng Yong <shengyong1@huawei.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/super.c')
-rw-r--r--fs/f2fs/super.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 419eaacf3366..dcdae3f932e2 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1891,6 +1891,18 @@ static int f2fs_get_context(struct inode *inode, void *ctx, size_t len)
static int f2fs_set_context(struct inode *inode, const void *ctx, size_t len,
void *fs_data)
{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+
+ /*
+ * Encrypting the root directory is not allowed because fsck
+ * expects lost+found directory to exist and remain unencrypted
+ * if LOST_FOUND feature is enabled.
+ *
+ */
+ if (f2fs_sb_has_lost_found(sbi->sb) &&
+ inode->i_ino == F2FS_ROOT_INO(sbi))
+ return -EPERM;
+
return f2fs_setxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
ctx, len, fs_data, XATTR_CREATE);