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ext4: mballoc avoid use root reserved blocks for non root allocation 

mballoc allocation missed check for blocks reserved for root users. Add
ext4_has_free_blocks() check before allocation. Also modified
ext4_has_free_blocks() to support multiple block allocation request.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Mingming Cao 2008-07-11 19:27:31 -04:00 committed by Theodore Ts'o
parent d755fb3842
commit 0703143107
3 changed files with 41 additions and 19 deletions
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51
fs/ext4/balloc.c
View File

@ -1599,23 +1599,35 @@ ext4_try_to_allocate_with_rsv(struct super_block *sb, handle_t *handle,
/**
* ext4_has_free_blocks()
* @sbi: in-core super block structure.
* @sbi: in-core super block structure.
* @nblocks: number of neeed blocks
*
* Check if filesystem has at least 1 free block available for allocation.
* Check if filesystem has free blocks available for allocation.
* Return the number of blocks avaible for allocation for this request
* On success, return nblocks
*/
static int ext4_has_free_blocks(struct ext4_sb_info *sbi)
ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
ext4_fsblk_t nblocks)
{
ext4_fsblk_t free_blocks, root_blocks;
ext4_fsblk_t free_blocks;
ext4_fsblk_t root_blocks = 0;
free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
root_blocks = ext4_r_blocks_count(sbi->s_es);
if (free_blocks < root_blocks + 1 && !capable(CAP_SYS_RESOURCE) &&
if (!capable(CAP_SYS_RESOURCE) &&
sbi->s_resuid != current->fsuid &&
(sbi->s_resgid == 0 || !in_group_p (sbi->s_resgid))) {
return 0;
}
return 1;
}
(sbi->s_resgid == 0 || !in_group_p(sbi->s_resgid)))
root_blocks = ext4_r_blocks_count(sbi->s_es);
#ifdef CONFIG_SMP
if (free_blocks - root_blocks < FBC_BATCH)
free_blocks =
percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
#endif
if (free_blocks - root_blocks < nblocks)
return free_blocks - root_blocks;
return nblocks;
}
/**
* ext4_should_retry_alloc()
@ -1631,7 +1643,7 @@ static int ext4_has_free_blocks(struct ext4_sb_info *sbi)
*/
int ext4_should_retry_alloc(struct super_block *sb, int *retries)
{
if (!ext4_has_free_blocks(EXT4_SB(sb)) || (*retries)++ > 3)
if (!ext4_has_free_blocks(EXT4_SB(sb), 1) || (*retries)++ > 3)
return 0;
jbd_debug(1, "%s: retrying operation after ENOSPC\n", sb->s_id);
@ -1681,13 +1693,21 @@ ext4_fsblk_t ext4_old_new_blocks(handle_t *handle, struct inode *inode,
ext4_group_t ngroups;
unsigned long num = *count;
*errp = -ENOSPC;
sb = inode->i_sb;
if (!sb) {
*errp = -ENODEV;
printk("ext4_new_block: nonexistent device");
return 0;
}
sbi = EXT4_SB(sb);
*count = ext4_has_free_blocks(sbi, *count);
if (*count == 0) {
*errp = -ENOSPC;
return 0; /*return with ENOSPC error */
}
num = *count;
/*
* Check quota for allocation of this block.
*/
@ -1711,11 +1731,6 @@ ext4_fsblk_t ext4_old_new_blocks(handle_t *handle, struct inode *inode,
if (block_i && ((windowsz = block_i->rsv_window_node.rsv_goal_size) > 0))
my_rsv = &block_i->rsv_window_node;
if (!ext4_has_free_blocks(sbi)) {
*errp = -ENOSPC;
goto out;
}
/*
* First, test whether the goal block is free.
*/

2
fs/ext4/ext4.h
View File

@ -979,6 +979,8 @@ extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
unsigned long *count, int *errp);
extern ext4_fsblk_t ext4_old_new_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp);
extern ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
ext4_fsblk_t nblocks);
extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
ext4_fsblk_t block, unsigned long count, int metadata);
extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,

7
fs/ext4/mballoc.c
View File

@ -4045,6 +4045,12 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
&(ar->len), errp);
return block;
}
ar->len = ext4_has_free_blocks(sbi, ar->len);
if (ar->len == 0) {
*errp = -ENOSPC;
return 0;
}
while (ar->len && DQUOT_ALLOC_BLOCK(ar->inode, ar->len)) {
ar->flags |= EXT4_MB_HINT_NOPREALLOC;
@ -4073,7 +4079,6 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
ac->ac_op = EXT4_MB_HISTORY_PREALLOC;
if (!ext4_mb_use_preallocated(ac)) {
ac->ac_op = EXT4_MB_HISTORY_ALLOC;
ext4_mb_normalize_request(ac, ar);
repeat: