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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
parentda5ce874f8cabe18bc34b50856933108830663bc (diff)
downloadlinux-b7c409deda6bcaaa6452b015937a013dd8b481b4.tar.bz2
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')
-rw-r--r--fs/f2fs/f2fs.h2
-rw-r--r--fs/f2fs/super.c12
-rw-r--r--fs/f2fs/sysfs.c7
3 files changed, 21 insertions, 0 deletions
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 641b4b98d373..c0d74ff9a6d7 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -144,6 +144,7 @@ struct f2fs_mount_info {
#define F2FS_FEATURE_FLEXIBLE_INLINE_XATTR 0x0040
#define F2FS_FEATURE_QUOTA_INO 0x0080
#define F2FS_FEATURE_INODE_CRTIME 0x0100
+#define F2FS_FEATURE_LOST_FOUND 0x0200
#define F2FS_HAS_FEATURE(sb, mask) \
((F2FS_SB(sb)->raw_super->feature & cpu_to_le32(mask)) != 0)
@@ -3214,6 +3215,7 @@ F2FS_FEATURE_FUNCS(inode_chksum, INODE_CHKSUM);
F2FS_FEATURE_FUNCS(flexible_inline_xattr, FLEXIBLE_INLINE_XATTR);
F2FS_FEATURE_FUNCS(quota_ino, QUOTA_INO);
F2FS_FEATURE_FUNCS(inode_crtime, INODE_CRTIME);
+F2FS_FEATURE_FUNCS(lost_found, LOST_FOUND);
#ifdef CONFIG_BLK_DEV_ZONED
static inline int get_blkz_type(struct f2fs_sb_info *sbi,
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);
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 7d983ad19da4..f33a56d6e6dd 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -116,6 +116,9 @@ static ssize_t features_show(struct f2fs_attr *a,
if (f2fs_sb_has_inode_crtime(sb))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "inode_crtime");
+ if (f2fs_sb_has_lost_found(sb))
+ len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
+ len ? ", " : "", "lost_found");
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
return len;
}
@@ -292,6 +295,7 @@ enum feat_id {
FEAT_FLEXIBLE_INLINE_XATTR,
FEAT_QUOTA_INO,
FEAT_INODE_CRTIME,
+ FEAT_LOST_FOUND,
};
static ssize_t f2fs_feature_show(struct f2fs_attr *a,
@@ -307,6 +311,7 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
case FEAT_FLEXIBLE_INLINE_XATTR:
case FEAT_QUOTA_INO:
case FEAT_INODE_CRTIME:
+ case FEAT_LOST_FOUND:
return snprintf(buf, PAGE_SIZE, "supported\n");
}
return 0;
@@ -386,6 +391,7 @@ F2FS_FEATURE_RO_ATTR(inode_checksum, FEAT_INODE_CHECKSUM);
F2FS_FEATURE_RO_ATTR(flexible_inline_xattr, FEAT_FLEXIBLE_INLINE_XATTR);
F2FS_FEATURE_RO_ATTR(quota_ino, FEAT_QUOTA_INO);
F2FS_FEATURE_RO_ATTR(inode_crtime, FEAT_INODE_CRTIME);
+F2FS_FEATURE_RO_ATTR(lost_found, FEAT_LOST_FOUND);
#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
static struct attribute *f2fs_attrs[] = {
@@ -441,6 +447,7 @@ static struct attribute *f2fs_feat_attrs[] = {
ATTR_LIST(flexible_inline_xattr),
ATTR_LIST(quota_ino),
ATTR_LIST(inode_crtime),
+ ATTR_LIST(lost_found),
NULL,
};