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Commit 5786b414 authored by Sheng Yong's avatar Sheng Yong Committed by Jaegeuk Kim
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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: default avatarSheng Yong <shengyong1@huawei.com>
Reviewed-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 9813cae6

fs/f2fs/f2fs.h

+2 −0
Original line number Diff line number Diff line
@@ -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,

fs/f2fs/super.c

+12 −0
Original line number Diff line number Diff line
@@ -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);

fs/f2fs/sysfs.c

+7 −0
Original line number Diff line number Diff line
@@ -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,

};