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Subject[PATCH 08/52] ext4: miscellaneous error checks and coding cleanups for mballoc
Date
From: Shen Feng <shen@cn.fujitsu.com>

ext4_mb_seq_history_open(): check if sbi->s_mb_history is NULL

ext4_mb_history_init(): replace kmalloc and memset with kzalloc

ext4_mb_init_backend(): remove memset since kzalloc is used

ext4_mb_init(): the return value of ext4_mb_init_backend is int,
but i is unsigned, replace it with a new int variable.

Signed-off-by: Shen Feng <shen@cn.fujitsu.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
fs/ext4/mballoc.c | 14 +++++++-------
1 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 49c1d1c..37ac13d 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -1979,6 +1979,8 @@ static int ext4_mb_seq_history_open(struct inode *inode, struct file *file)
int rc;
int size;

+ if (unlikely(sbi->s_mb_history == NULL))
+ return -ENOMEM;
s = kmalloc(sizeof(*s), GFP_KERNEL);
if (s == NULL)
return -ENOMEM;
@@ -2181,9 +2183,7 @@ static void ext4_mb_history_init(struct super_block *sb)
sbi->s_mb_history_cur = 0;
spin_lock_init(&sbi->s_mb_history_lock);
i = sbi->s_mb_history_max * sizeof(struct ext4_mb_history);
- sbi->s_mb_history = kmalloc(i, GFP_KERNEL);
- if (likely(sbi->s_mb_history != NULL))
- memset(sbi->s_mb_history, 0, i);
+ sbi->s_mb_history = kzalloc(i, GFP_KERNEL);
/* if we can't allocate history, then we simple won't use it */
}

@@ -2297,7 +2297,6 @@ static int ext4_mb_init_backend(struct super_block *sb)
i++;
goto err_freebuddy;
}
- memset(meta_group_info[j], 0, len);
set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT,
&(meta_group_info[j]->bb_state));

@@ -2352,6 +2351,7 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
unsigned i;
unsigned offset;
unsigned max;
+ int ret;

if (!test_opt(sb, MBALLOC))
return 0;
@@ -2386,12 +2386,12 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
} while (i <= sb->s_blocksize_bits + 1);

/* init file for buddy data */
- i = ext4_mb_init_backend(sb);
- if (i) {
+ ret = ext4_mb_init_backend(sb);
+ if (ret != 0) {
clear_opt(sbi->s_mount_opt, MBALLOC);
kfree(sbi->s_mb_offsets);
kfree(sbi->s_mb_maxs);
- return i;
+ return ret;
}

spin_lock_init(&sbi->s_md_lock);
--
1.5.6.rc3.1.g36b7.dirty


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