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Message-Id: <20130304033708.557694317@decadent.org.uk>
Date: Mon, 04 Mar 2013 03:37:16 +0000
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: akpm@...ux-foundation.org, Theodore Tso <tytso@....edu>
Subject: [ 009/153] ext4: return ENOMEM if sb_getblk() fails
3.2-stable review patch. If anyone has any objections, please let me know.
------------------
From: Theodore Ts'o <tytso@....edu>
commit 860d21e2c585f7ee8a4ecc06f474fdc33c9474f4 upstream.
The only reason for sb_getblk() failing is if it can't allocate the
buffer_head. So ENOMEM is more appropriate than EIO. In addition,
make sure that the file system is marked as being inconsistent if
sb_getblk() fails.
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
[bwh: Backported to 3.2:
- Adjust context
- Drop change to inline.c
- Call to ext4_ext_check() from ext4_ext_find_extent() is conditional]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
fs/ext4/extents.c | 25 ++++++++++++++-----------
fs/ext4/indirect.c | 9 ++++++---
fs/ext4/inline.c | 2 +-
fs/ext4/inode.c | 9 +++------
fs/ext4/mmp.c | 2 ++
fs/ext4/resize.c | 8 ++++----
fs/ext4/xattr.c | 3 ++-
7 files changed, 32 insertions(+), 26 deletions(-)
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -636,6 +636,7 @@ ext4_ext_find_extent(struct inode *inode
struct ext4_extent_header *eh;
struct buffer_head *bh;
short int depth, i, ppos = 0, alloc = 0;
+ int ret;
eh = ext_inode_hdr(inode);
depth = ext_depth(inode);
@@ -665,12 +666,15 @@ ext4_ext_find_extent(struct inode *inode
path[ppos].p_ext = NULL;
bh = sb_getblk(inode->i_sb, path[ppos].p_block);
- if (unlikely(!bh))
+ if (unlikely(!bh)) {
+ ret = -ENOMEM;
goto err;
+ }
if (!bh_uptodate_or_lock(bh)) {
trace_ext4_ext_load_extent(inode, block,
path[ppos].p_block);
- if (bh_submit_read(bh) < 0) {
+ ret = bh_submit_read(bh);
+ if (ret < 0) {
put_bh(bh);
goto err;
}
@@ -683,13 +687,15 @@ ext4_ext_find_extent(struct inode *inode
put_bh(bh);
EXT4_ERROR_INODE(inode,
"ppos %d > depth %d", ppos, depth);
+ ret = -EIO;
goto err;
}
path[ppos].p_bh = bh;
path[ppos].p_hdr = eh;
i--;
- if (need_to_validate && ext4_ext_check(inode, eh, i))
+ ret = need_to_validate ? ext4_ext_check(inode, eh, i) : 0;
+ if (ret < 0)
goto err;
}
@@ -711,7 +717,7 @@ err:
ext4_ext_drop_refs(path);
if (alloc)
kfree(path);
- return ERR_PTR(-EIO);
+ return ERR_PTR(ret);
}
/*
@@ -866,7 +872,7 @@ static int ext4_ext_split(handle_t *hand
}
bh = sb_getblk(inode->i_sb, newblock);
if (!bh) {
- err = -EIO;
+ err = -ENOMEM;
goto cleanup;
}
lock_buffer(bh);
@@ -938,7 +944,7 @@ static int ext4_ext_split(handle_t *hand
newblock = ablocks[--a];
bh = sb_getblk(inode->i_sb, newblock);
if (!bh) {
- err = -EIO;
+ err = -ENOMEM;
goto cleanup;
}
lock_buffer(bh);
@@ -1049,11 +1055,8 @@ static int ext4_ext_grow_indepth(handle_
return err;
bh = sb_getblk(inode->i_sb, newblock);
- if (!bh) {
- err = -EIO;
- ext4_std_error(inode->i_sb, err);
- return err;
- }
+ if (!bh)
+ return -ENOMEM;
lock_buffer(bh);
err = ext4_journal_get_create_access(handle, bh);
--- a/fs/ext4/indirect.c
+++ b/fs/ext4/indirect.c
@@ -146,6 +146,7 @@ static Indirect *ext4_get_branch(struct
struct super_block *sb = inode->i_sb;
Indirect *p = chain;
struct buffer_head *bh;
+ int ret = -EIO;
*err = 0;
/* i_data is not going away, no lock needed */
@@ -154,8 +155,10 @@ static Indirect *ext4_get_branch(struct
goto no_block;
while (--depth) {
bh = sb_getblk(sb, le32_to_cpu(p->key));
- if (unlikely(!bh))
+ if (unlikely(!bh)) {
+ ret = -ENOMEM;
goto failure;
+ }
if (!bh_uptodate_or_lock(bh)) {
if (bh_submit_read(bh) < 0) {
@@ -177,7 +180,7 @@ static Indirect *ext4_get_branch(struct
return NULL;
failure:
- *err = -EIO;
+ *err = ret;
no_block:
return p;
}
@@ -471,7 +474,7 @@ static int ext4_alloc_branch(handle_t *h
*/
bh = sb_getblk(inode->i_sb, new_blocks[n-1]);
if (unlikely(!bh)) {
- err = -EIO;
+ err = -ENOMEM;
goto failed;
}
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -661,7 +661,7 @@ struct buffer_head *ext4_getblk(handle_t
bh = sb_getblk(inode->i_sb, map.m_pblk);
if (!bh) {
- *errp = -EIO;
+ *errp = -ENOMEM;
return NULL;
}
if (map.m_flags & EXT4_MAP_NEW) {
@@ -3575,11 +3575,8 @@ static int __ext4_get_inode_loc(struct i
iloc->offset = (inode_offset % inodes_per_block) * EXT4_INODE_SIZE(sb);
bh = sb_getblk(sb, block);
- if (!bh) {
- EXT4_ERROR_INODE_BLOCK(inode, block,
- "unable to read itable block");
- return -EIO;
- }
+ if (!bh)
+ return -ENOMEM;
if (!buffer_uptodate(bh)) {
lock_buffer(bh);
--- a/fs/ext4/mmp.c
+++ b/fs/ext4/mmp.c
@@ -41,6 +41,8 @@ static int read_mmp_block(struct super_b
* is not blocked in the elevator. */
if (!*bh)
*bh = sb_getblk(sb, mmp_block);
+ if (!*bh)
+ return -ENOMEM;
if (*bh) {
get_bh(*bh);
lock_buffer(*bh);
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -142,7 +142,7 @@ static struct buffer_head *bclean(handle
bh = sb_getblk(sb, blk);
if (!bh)
- return ERR_PTR(-EIO);
+ return ERR_PTR(-ENOMEM);
if ((err = ext4_journal_get_write_access(handle, bh))) {
brelse(bh);
bh = ERR_PTR(err);
@@ -220,7 +220,7 @@ static int setup_new_group_blocks(struct
gdb = sb_getblk(sb, block);
if (!gdb) {
- err = -EIO;
+ err = -ENOMEM;
goto exit_journal;
}
if ((err = ext4_journal_get_write_access(handle, gdb))) {
@@ -694,7 +694,7 @@ static void update_backups(struct super_
bh = sb_getblk(sb, group * bpg + blk_off);
if (!bh) {
- err = -EIO;
+ err = -ENOMEM;
break;
}
ext4_debug("update metadata backup %#04lx\n",
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -839,16 +839,17 @@ inserted:
new_bh = sb_getblk(sb, block);
if (!new_bh) {
+ error = -ENOMEM;
getblk_failed:
ext4_free_blocks(handle, inode, NULL, block, 1,
EXT4_FREE_BLOCKS_METADATA);
- error = -EIO;
goto cleanup;
}
lock_buffer(new_bh);
error = ext4_journal_get_create_access(handle, new_bh);
if (error) {
unlock_buffer(new_bh);
+ error = -EIO;
goto getblk_failed;
}
memcpy(new_bh->b_data, s->base, new_bh->b_size);
--
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