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Date: Mon, 3 Mar 2014 17:16:53 -0500
From: Theodore Ts'o <tytso@....edu>
To: Zheng Liu <gnehzuil.liu@...il.com>
Cc: linux-ext4@...r.kernel.org,
"Darrick J. Wong" <darrick.wong@...cle.com>,
Zheng Liu <wenqing.lz@...bao.com>
Subject: Re: [PATCH v3 11/30] libext2fs: handle inline data in dir iterator
function
As I mentioend on today's call, there are some pretty serious issues
with ext2fs_inline_data_dir_iterate(). In some places, it is
returning an errcode_t, and in some cases, it was returning the
BLOCK_ABORT, et. al flags (which would be an int).
Also, all of the callers of ext2fs_inline_data_dir_iterate() pass in
ext2fs_process_dir_block(), and given that
ext2fs_inline-data_dir_iterate() is a non-public function, it makes
the code simpler and more maintable to call ext2fs_process_dir_block()
directly. I think we would be better having a
ext2fs_process_dir_buffer() function, instead of complicating the
ext2fs_process_dir_block() interface, but that's a cleanup that we can
do in a different commit.
Here are the diffs that I had to apply to make everything be
consistent. It was a pretty significant change, so I'd appreciate a
second pair of eyes to sanity check what I changed. This diff is
versus the state of the tree after applying your PATCH v3 11/30 diff.
- Ted
diff --git a/lib/ext2fs/dir_iterate.c b/lib/ext2fs/dir_iterate.c
index 6bdfae5..8afccbe 100644
--- a/lib/ext2fs/dir_iterate.c
+++ b/lib/ext2fs/dir_iterate.c
@@ -129,9 +129,7 @@ errcode_t ext2fs_dir_iterate2(ext2_filsys fs,
ext2fs_free_mem(&ctx.buf);
if (retval == EXT2_ET_INLINE_DATA_CANT_ITERATE) {
ctx.flags |= DIRENT_FLAG_INCLUDE_INLINE_DATA;
- retval = ext2fs_inline_data_dir_iterate(fs, dir,
- ext2fs_process_dir_block,
- &ctx);
+ (void) ext2fs_inline_data_dir_iterate(fs, dir, &ctx);
}
if (retval)
return retval;
diff --git a/lib/ext2fs/ext2fsP.h b/lib/ext2fs/ext2fsP.h
index d910f42..b2afd15 100644
--- a/lib/ext2fs/ext2fsP.h
+++ b/lib/ext2fs/ext2fsP.h
@@ -88,15 +88,9 @@ extern int ext2fs_process_dir_block(ext2_filsys fs,
int ref_offset,
void *priv_data);
-extern errcode_t ext2fs_inline_data_dir_iterate(ext2_filsys fs,
- ext2_ino_t ino,
- int (*func)(ext2_filsys fs,
- blk64_t *blocknr,
- e2_blkcnt_t blockcnt,
- blk64_t ref_blk,
- int ref_offset,
- void *priv_data),
- void *priv_data);
+extern int ext2fs_inline_data_dir_iterate(ext2_filsys fs,
+ ext2_ino_t ino,
+ void *priv_data);
/* Generic numeric progress meter */
diff --git a/lib/ext2fs/inline_data.c b/lib/ext2fs/inline_data.c
index b768b9a..db1bc03 100644
--- a/lib/ext2fs/inline_data.c
+++ b/lib/ext2fs/inline_data.c
@@ -78,36 +78,32 @@ err:
}
-errcode_t ext2fs_inline_data_dir_iterate(ext2_filsys fs,
- ext2_ino_t ino,
- int (*func)(ext2_filsys fs,
- blk64_t *blocknr,
- e2_blkcnt_t blockcnt,
- blk64_t ref_blk,
- int ref_offset,
- void *priv_data),
- void *priv_data)
+int ext2fs_inline_data_dir_iterate(ext2_filsys fs, ext2_ino_t ino,
+ void *priv_data)
{
struct dir_context *ctx;
struct ext2_inode inode;
struct ext2_dir_entry dirent;
struct ext2_inline_data data;
- errcode_t retval = 0;
+ int ret = BLOCK_ABORT;
e2_blkcnt_t blockcnt = 0;
ctx = (struct dir_context *)priv_data;
- retval = ext2fs_read_inode(fs, ino, &inode);
- if (retval)
+ ctx->errcode = ext2fs_read_inode(fs, ino, &inode);
+ if (ctx->errcode)
goto out;
- if (!(inode.i_flags & EXT4_INLINE_DATA_FL))
- return EXT2_ET_NO_INLINE_DATA;
+ if (!(inode.i_flags & EXT4_INLINE_DATA_FL)) {
+ ctx->errcode = EXT2_ET_NO_INLINE_DATA;
+ goto out;
+ }
if (!LINUX_S_ISDIR(inode.i_mode)) {
- retval = EXT2_ET_NO_DIRECTORY;
+ ctx->errcode = EXT2_ET_NO_DIRECTORY;
goto out;
}
+ ret = 0;
/* we first check '.' and '..' dir */
dirent.inode = ino;
@@ -117,8 +113,8 @@ errcode_t ext2fs_inline_data_dir_iterate(ext2_filsys fs,
dirent.name[1] = '\0';
ctx->buf = (char *)&dirent;
ext2fs_get_rec_len(fs, &dirent, &ctx->buflen);
- retval |= (*func)(fs, 0, blockcnt++, 0, 0, priv_data);
- if (retval & BLOCK_ABORT)
+ ret |= ext2fs_process_dir_block(fs, 0, blockcnt++, 0, 0, priv_data);
+ if (ret & BLOCK_ABORT)
goto out;
dirent.inode = ext2fs_le32_to_cpu(inode.i_block[0]);
@@ -129,8 +125,8 @@ errcode_t ext2fs_inline_data_dir_iterate(ext2_filsys fs,
dirent.name[2] = '\0';
ctx->buf = (char *)&dirent;
ext2fs_get_rec_len(fs, &dirent, &ctx->buflen);
- retval |= (*func)(fs, 0, blockcnt++, 0, 0, priv_data);
- if (retval & BLOCK_INLINE_DATA_CHANGED) {
+ ret |= ext2fs_process_dir_block(fs, 0, blockcnt++, 0, 0, priv_data);
+ if (ret & BLOCK_INLINE_DATA_CHANGED) {
errcode_t err;
inode.i_block[0] = ext2fs_cpu_to_le32(dirent.inode);
@@ -138,62 +134,68 @@ errcode_t ext2fs_inline_data_dir_iterate(ext2_filsys fs,
if (err)
goto out;
}
- if (retval & BLOCK_ABORT)
+ if (ret & BLOCK_ABORT)
goto out;
ctx->buf = (char *)inode.i_block + EXT4_INLINE_DATA_DOTDOT_SIZE;
ctx->buflen = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DATA_DOTDOT_SIZE;
#ifdef WORDS_BIGENDIAN
- retval = ext2fs_dirent_swab_in2(fs, ctx->buf, ctx->buflen, 0);
- if (retval)
+ ctx->errcode = ext2fs_dirent_swab_in2(fs, ctx->buf, ctx->buflen, 0);
+ if (ctx->errcode) {
+ ret |= BLOCK_ABORT;
goto out;
+ }
#endif
- retval |= (*func)(fs, 0, blockcnt++, 0, 0, priv_data);
- if (retval & BLOCK_INLINE_DATA_CHANGED) {
- errcode_t err;
-
+ ret |= ext2fs_process_dir_block(fs, 0, blockcnt++, 0, 0, priv_data);
+ if (ret & BLOCK_INLINE_DATA_CHANGED) {
#ifdef WORDS_BIGENDIAN
- err = ext2fs_dirent_swab_out2(fs, ctx->buf, ctx->buflen, 0);
- if (err)
+ ctx->errcode = ext2fs_dirent_swab_out2(fs, ctx->buf,
+ ctx->buflen, 0);
+ if (ctx->errcode) {
+ ret |= BLOCK_ABORT;
goto out;
+ }
#endif
- err = ext2fs_write_inode(fs, ino, &inode);
- if (err)
- goto out;
+ ctx->errcode = ext2fs_write_inode(fs, ino, &inode);
+ if (ctx->errcode)
+ ret |= BLOCK_ABORT;
}
- if (retval & BLOCK_ABORT)
+ if (ret & BLOCK_ABORT)
goto out;
data.fs = fs;
data.ino = ino;
- retval = ext2fs_inline_data_ea_get(&data);
- if (retval)
+ ctx->errcode = ext2fs_inline_data_ea_get(&data);
+ if (ctx->errcode) {
+ ret |= BLOCK_ABORT;
goto out;
+ }
if (data.ea_size <= 0)
goto out;
ctx->buf = data.ea_data;
ctx->buflen = data.ea_size;
#ifdef WORDS_BIGENDIAN
- retval = ext2fs_dirent_swab_in2(fs, ctx->buf, ctx->buflen, 0);
- if (retval)
+ ctx.errcode = ext2fs_dirent_swab_in2(fs, ctx->buf, ctx->buflen, 0);
+ if (ctx.errcode) {
+ ret |= BLOCK_ABORT;
goto out;
+ }
#endif
- retval |= (*func)(fs, 0, blockcnt++, 0, 0, priv_data);
- if (retval & BLOCK_INLINE_DATA_CHANGED) {
- errcode_t err;
-
+ ret |= ext2fs_process_dir_block(fs, 0, blockcnt++, 0, 0, priv_data);
+ if (ret & BLOCK_INLINE_DATA_CHANGED) {
#ifdef WORDS_BIGENDIAN
- err = ext2fs_dirent_swab_out2(fs, ctx->buf, ctx->buflen, 0);
- if (err) {
- retval = err;
+ ctx->errcode = ext2fs_dirent_swab_out2(fs, ctx->buf,
+ ctx->buflen, 0);
+ if (ctx->errcode) {
+ ret |= BLOCK_ABORT;
goto out1;
}
#endif
- err = ext2fs_inline_data_ea_set(&data);
- if (err)
- retval = err;
+ ctx->errcode = ext2fs_inline_data_ea_set(&data);
+ if (ctx->errcode)
+ ret |= BLOCK_ABORT;
}
out1:
@@ -201,6 +203,6 @@ out1:
ctx->buf = 0;
out:
- retval &= ~(BLOCK_ABORT | BLOCK_INLINE_DATA_CHANGED);
- return retval & BLOCK_ERROR ? ctx->errcode : retval;
+ ret &= ~(BLOCK_ABORT | BLOCK_INLINE_DATA_CHANGED);
+ return ret;
}
--
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