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Date: Fri, 22 Aug 2014 03:29:48 -0400
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Theodore Ts'o <tytso@....edu>
Subject: [PATCH 4/6] ext4: convert ext4_bread() to use the ERR_PTR convention
Signed-off-by: Theodore Ts'o <tytso@....edu>
---
fs/ext4/dir.c | 8 +++-----
fs/ext4/ext4.h | 3 +--
fs/ext4/inode.c | 14 ++++----------
fs/ext4/namei.c | 34 ++++++++++++++++++----------------
fs/ext4/super.c | 18 ++++++++----------
5 files changed, 34 insertions(+), 43 deletions(-)
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 0bb3f9e..c24143e 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -151,13 +151,11 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
&file->f_ra, file,
index, 1);
file->f_ra.prev_pos = (loff_t)index << PAGE_CACHE_SHIFT;
- bh = ext4_bread(NULL, inode, map.m_lblk, 0, &err);
+ bh = ext4_bread(NULL, inode, map.m_lblk, 0);
+ if (IS_ERR(bh))
+ return PTR_ERR(bh);
}
- /*
- * We ignore I/O errors on directories so users have a chance
- * of recovering data when there's a bad sector
- */
if (!bh) {
if (!dir_has_error) {
EXT4_ERROR_FILE(file, 0,
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 0258710..5424aa3 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2087,8 +2087,7 @@ extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
/* inode.c */
struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
-struct buffer_head *ext4_bread(handle_t *, struct inode *,
- ext4_lblk_t, int, int *);
+struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
int ext4_get_block_write(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create);
int ext4_get_block(struct inode *inode, sector_t iblock,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 7757657..16c370f 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -791,27 +791,21 @@ errout:
}
struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode,
- ext4_lblk_t block, int create, int *err)
+ ext4_lblk_t block, int create)
{
struct buffer_head *bh;
- *err = 0;
bh = ext4_getblk(handle, inode, block, create);
- if (IS_ERR(bh)) {
- *err = PTR_ERR(bh);
- return NULL;
- }
- if (!bh)
+ if (IS_ERR(bh))
return bh;
- if (buffer_uptodate(bh))
+ if (!bh || buffer_uptodate(bh))
return bh;
ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &bh);
wait_on_buffer(bh);
if (buffer_uptodate(bh))
return bh;
put_bh(bh);
- *err = -EIO;
- return NULL;
+ return ERR_PTR(-EIO);
}
int ext4_walk_page_buffers(handle_t *handle,
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 53b53bc..8043398 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -53,7 +53,7 @@ static struct buffer_head *ext4_append(handle_t *handle,
ext4_lblk_t *block)
{
struct buffer_head *bh;
- int err = 0;
+ int err;
if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb &&
((inode->i_size >> 10) >=
@@ -62,9 +62,9 @@ static struct buffer_head *ext4_append(handle_t *handle,
*block = inode->i_size >> inode->i_sb->s_blocksize_bits;
- bh = ext4_bread(handle, inode, *block, 1, &err);
- if (!bh)
- return ERR_PTR(err);
+ bh = ext4_bread(handle, inode, *block, 1);
+ if (IS_ERR(bh))
+ return bh;
inode->i_size += inode->i_sb->s_blocksize;
EXT4_I(inode)->i_disksize = inode->i_size;
BUFFER_TRACE(bh, "get_write_access");
@@ -94,20 +94,20 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
{
struct buffer_head *bh;
struct ext4_dir_entry *dirent;
- int err = 0, is_dx_block = 0;
+ int is_dx_block = 0;
- bh = ext4_bread(NULL, inode, block, 0, &err);
- if (!bh) {
- if (err == 0) {
- ext4_error_inode(inode, __func__, line, block,
- "Directory hole found");
- return ERR_PTR(-EIO);
- }
+ bh = ext4_bread(NULL, inode, block, 0);
+ if (IS_ERR(bh)) {
__ext4_warning(inode->i_sb, __func__, line,
- "error reading directory block "
- "(ino %lu, block %lu)", inode->i_ino,
+ "error %ld reading directory block "
+ "(ino %lu, block %lu)", PTR_ERR(bh), inode->i_ino,
(unsigned long) block);
- return ERR_PTR(err);
+
+ return bh;
+ }
+ if (!bh) {
+ ext4_error_inode(inode, __func__, line, block, "Directory hole found");
+ return ERR_PTR(-EIO);
}
dirent = (struct ext4_dir_entry *) bh->b_data;
/* Determine whether or not we have an index block */
@@ -640,7 +640,9 @@ struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
struct stats stats;
printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
- if (!(bh = ext4_bread (NULL,dir, block, 0,&err))) continue;
+ bh = ext4_bread(NULL,dir, block, 0);
+ if (!bh || IS_ERR(bh))
+ continue;
stats = levels?
dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
dx_show_leaf(hinfo, (struct ext4_dir_entry_2 *) bh->b_data, blocksize, 0);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 32b43ad..f9d8cf1 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -5304,7 +5304,6 @@ static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
{
struct inode *inode = sb_dqopt(sb)->files[type];
ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
- int err = 0;
int offset = off & (sb->s_blocksize - 1);
int tocopy;
size_t toread;
@@ -5319,9 +5318,9 @@ static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
while (toread > 0) {
tocopy = sb->s_blocksize - offset < toread ?
sb->s_blocksize - offset : toread;
- bh = ext4_bread(NULL, inode, blk, 0, &err);
- if (err)
- return err;
+ bh = ext4_bread(NULL, inode, blk, 0);
+ if (IS_ERR(bh))
+ return PTR_ERR(bh);
if (!bh) /* A hole? */
memset(data, 0, tocopy);
else
@@ -5342,8 +5341,7 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
{
struct inode *inode = sb_dqopt(sb)->files[type];
ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
- int err = 0;
- int offset = off & (sb->s_blocksize - 1);
+ int err, offset = off & (sb->s_blocksize - 1);
struct buffer_head *bh;
handle_t *handle = journal_current_handle();
@@ -5364,14 +5362,16 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
return -EIO;
}
- bh = ext4_bread(handle, inode, blk, 1, &err);
+ bh = ext4_bread(handle, inode, blk, 1);
+ if (IS_ERR(bh))
+ return PTR_ERR(bh);
if (!bh)
goto out;
BUFFER_TRACE(bh, "get write access");
err = ext4_journal_get_write_access(handle, bh);
if (err) {
brelse(bh);
- goto out;
+ return err;
}
lock_buffer(bh);
memcpy(bh->b_data+offset, data, len);
@@ -5380,8 +5380,6 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
err = ext4_handle_dirty_metadata(handle, NULL, bh);
brelse(bh);
out:
- if (err)
- return err;
if (inode->i_size < off + len) {
i_size_write(inode, off + len);
EXT4_I(inode)->i_disksize = inode->i_size;
--
2.1.0
--
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