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Message-Id: <1358025134-20167-1-git-send-email-tytso@mit.edu>
Date: Sat, 12 Jan 2013 16:12:14 -0500
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Theodore Ts'o <tytso@....edu>, stable@...r.kernel.org
Subject: [PATCH] ext4: return ENOMEM if sb_getblk() fails
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>
Cc: stable@...r.kernel.org
---
fs/ext4/extents.c | 21 ++++++++++++---------
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, 30 insertions(+), 24 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 5ae1674..6913a8d 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -725,6 +725,7 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
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);
@@ -752,12 +753,15 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
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;
}
@@ -768,13 +772,15 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
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 (ext4_ext_check_block(inode, eh, i, bh))
+ ret = ext4_ext_check_block(inode, eh, i, bh);
+ if (ret < 0)
goto err;
}
@@ -796,7 +802,7 @@ err:
ext4_ext_drop_refs(path);
if (alloc)
kfree(path);
- return ERR_PTR(-EIO);
+ return ERR_PTR(ret);
}
/*
@@ -1136,11 +1142,8 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
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);
diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
index 20862f9..8d83d1e 100644
--- a/fs/ext4/indirect.c
+++ b/fs/ext4/indirect.c
@@ -146,6 +146,7 @@ static Indirect *ext4_get_branch(struct inode *inode, int depth,
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 inode *inode, int depth,
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 inode *inode, int depth,
return NULL;
failure:
- *err = -EIO;
+ *err = ret;
no_block:
return p;
}
@@ -471,7 +474,7 @@ static int ext4_alloc_branch(handle_t *handle, struct inode *inode,
*/
bh = sb_getblk(inode->i_sb, new_blocks[n-1]);
if (unlikely(!bh)) {
- err = -EIO;
+ err = -ENOMEM;
goto failed;
}
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index 387c47c..93a3408 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -1188,7 +1188,7 @@ static int ext4_convert_inline_data_nolock(handle_t *handle,
data_bh = sb_getblk(inode->i_sb, map.m_pblk);
if (!data_bh) {
- error = -EIO;
+ error = -ENOMEM;
goto out_restore;
}
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index cbfe13b..9ccc140 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -714,7 +714,7 @@ struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
bh = sb_getblk(inode->i_sb, map.m_pblk);
if (!bh) {
- *errp = -EIO;
+ *errp = -ENOMEM;
return NULL;
}
if (map.m_flags & EXT4_MAP_NEW) {
@@ -3660,11 +3660,8 @@ static int __ext4_get_inode_loc(struct inode *inode,
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);
diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c
index fe7c63f..44734f1 100644
--- a/fs/ext4/mmp.c
+++ b/fs/ext4/mmp.c
@@ -80,6 +80,8 @@ static int read_mmp_block(struct super_block *sb, struct buffer_head **bh,
* 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);
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index d99387b..02824dc 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -334,7 +334,7 @@ static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
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);
@@ -411,7 +411,7 @@ static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle,
bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap);
if (!bh)
- return -EIO;
+ return -ENOMEM;
err = ext4_journal_get_write_access(handle, bh);
if (err)
@@ -501,7 +501,7 @@ static int setup_new_flex_group_blocks(struct super_block *sb,
gdb = sb_getblk(sb, block);
if (!gdb) {
- err = -EIO;
+ err = -ENOMEM;
goto out;
}
@@ -1065,7 +1065,7 @@ static void update_backups(struct super_block *sb, int blk_off, char *data,
bh = sb_getblk(sb, backup_block);
if (!bh) {
- err = -EIO;
+ err = -ENOMEM;
break;
}
ext4_debug("update metadata backup %llu(+%llu)\n",
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 3a91ebc..07d684a 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -887,16 +887,17 @@ 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);
--
1.7.12.rc0.22.gcdd159b
--
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