[PATCH 1/2] e2fsck: handle symlink properly with inline data

[PATCH 1/2] e2fsck: handle symlink properly with inline data

[Zheng Liu]

From: Zheng Liu <wenqing.lz@taobao.com>

After fixing a bug on kernel side for handling symlink properly with
inline data, it will break the assumption in e2fsck because in original
patch set of inline data it doesn't support symlink with inline data
feature.  This commit makes e2fsck handle symlink properly with inline
data.

After applied this patch, the inline data feature has ability to store
the symlink.  We also need to add this ability for symlink commmand in
debugfs.

Cc: Ian Nartowicz <claws@nartowicz.co.uk>
Cc: Tao Ma <tm@tao.ma>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
---
 e2fsck/pass1.c |   18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index e1012c0..ba60029 100644
--- a/e2fsck/pass1.c
+++ b/e2fsck/pass1.c
@@ -177,8 +177,7 @@ int e2fsck_pass1_check_symlink(ext2_filsys fs, ext2_ino_t ino,
 	struct ext2fs_extent	extent;
 
 	if ((inode->i_size_high || inode->i_size == 0) ||
-	    (inode->i_flags & EXT2_INDEX_FL) ||
-	    (inode->i_flags & EXT4_INLINE_DATA_FL))
+	    (inode->i_flags & EXT2_INDEX_FL))
 		return 0;
 
 	if (inode->i_flags & EXT4_EXTENTS_FL) {
@@ -203,6 +202,17 @@ int e2fsck_pass1_check_symlink(ext2_filsys fs, ext2_ino_t ino,
 		return i;
 	}
 
+	if (inode->i_flags & EXT4_INLINE_DATA_FL) {
+		size_t inline_size;
+
+		if (ext2fs_inline_data_size(fs, ino, &inline_size))
+			return 0;
+		if (inode->i_size != inline_size)
+			return 0;
+
+		return 1;
+	}
+
 	blocks = ext2fs_inode_data_blocks2(fs, inode);
 	if (blocks) {
 		if ((inode->i_size >= fs->blocksize) ||
@@ -1189,7 +1199,9 @@ void e2fsck_pass1(e2fsck_t ctx)
 						      block_buf)) {
 			check_immutable(ctx, &pctx);
 			ctx->fs_symlinks_count++;
-			if (ext2fs_inode_data_blocks(fs, inode) == 0) {
+			if (inode->i_flags & EXT4_INLINE_DATA_FL) {
+				continue;
+			} else if (ext2fs_inode_data_blocks(fs, inode) == 0) {
 				ctx->fs_fast_symlinks_count++;
 				check_blocks(ctx, &pctx, block_buf);
 				continue;
-- 
1.7.9.7

[PATCH 2/2] debugfs: do not display fast symlink with inline data

[Zheng Liu]

From: Zheng Liu <wenqing.lz@taobao.com>

After enabling symlink with inline data, stat command in debugfs will
think an inode is a fast symlink.  This patch fixes this issue.

Cc: Ian Nartowicz <claws@nartowicz.co.uk>
Cc: Tao Ma <tm@tao.ma>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
---
 debugfs/debugfs.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c
index 23a7ca3..2147ffa 100644
--- a/debugfs/debugfs.c
+++ b/debugfs/debugfs.c
@@ -784,7 +784,9 @@ void internal_dump_inode(FILE *out, const char *prefix,
 		fprintf(out, "Inode checksum: 0x%08x\n", crc);
 	}
 
-	if (LINUX_S_ISLNK(inode->i_mode) && ext2fs_inode_data_blocks(current_fs,inode) == 0)
+	if (LINUX_S_ISLNK(inode->i_mode) &&
+	    ext2fs_inode_data_blocks(current_fs,inode) == 0 &&
+	    !(inode->i_flags & EXT4_INLINE_DATA_FL))
 		fprintf(out, "%sFast_link_dest: %.*s\n", prefix,
 			(int) inode->i_size, (char *)inode->i_block);
 	else if (LINUX_S_ISBLK(inode->i_mode) || LINUX_S_ISCHR(inode->i_mode)) {
-- 
1.7.9.7

Re: [PATCH 1/2] e2fsck: handle symlink properly with inline data

[Theodore Ts'o]

On Mon, Jun 02, 2014 at 07:40:40PM +0800, Zheng Liu wrote:
> From: Zheng Liu <wenqing.lz@taobao.com>
> 
> After fixing a bug on kernel side for handling symlink properly with
> inline data, it will break the assumption in e2fsck because in original
> patch set of inline data it doesn't support symlink with inline data
> feature.  This commit makes e2fsck handle symlink properly with inline
> data.
> 
> After applied this patch, the inline data feature has ability to store
> the symlink.  We also need to add this ability for symlink commmand in
> debugfs.

Applied, thanks.

					- Ted

Re: [PATCH 2/2] debugfs: do not display fast symlink with inline data

[Theodore Ts'o]

On Mon, Jun 02, 2014 at 07:40:41PM +0800, Zheng Liu wrote:
> From: Zheng Liu <wenqing.lz@taobao.com>
> 
> After enabling symlink with inline data, stat command in debugfs will
> think an inode is a fast symlink.  This patch fixes this issue.

Applied, thanks.

					- Ted