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-rw-r--r--fs/ext4/balloc.c77
1 files changed, 27 insertions, 50 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index b9821be..d2003cd 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -589,21 +589,23 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
return;
}
-int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
- s64 nblocks)
+/**
+ * ext4_has_free_blocks()
+ * @sbi: in-core super block structure.
+ * @nblocks: number of needed blocks
+ *
+ * Check if filesystem has nblocks free & available for allocation.
+ * On success return 1, return 0 on failure.
+ */
+int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
{
- s64 free_blocks, dirty_blocks;
- s64 root_blocks = 0;
+ s64 free_blocks, dirty_blocks, root_blocks;
struct percpu_counter *fbc = &sbi->s_freeblocks_counter;
struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter;
free_blocks = percpu_counter_read_positive(fbc);
dirty_blocks = percpu_counter_read_positive(dbc);
-
- if (!capable(CAP_SYS_RESOURCE) &&
- sbi->s_resuid != current->fsuid &&
- (sbi->s_resgid == 0 || !in_group_p(sbi->s_resgid)))
- root_blocks = ext4_r_blocks_count(sbi->s_es);
+ root_blocks = ext4_r_blocks_count(sbi->s_es);
if (free_blocks - (nblocks + root_blocks + dirty_blocks) <
EXT4_FREEBLOCKS_WATERMARK) {
@@ -616,57 +618,32 @@ int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
}
}
/* Check whether we have space after
- * accounting for current dirty blocks
+ * accounting for current dirty blocks & root reserved blocks.
*/
- if (free_blocks < ((root_blocks + nblocks) + dirty_blocks))
- /* we don't have free space */
- return -ENOSPC;
+ if (free_blocks >= ((root_blocks + nblocks) + dirty_blocks))
+ return 1;
+
+ /* Hm, nope. Are (enough) root reserved blocks available? */
+ if (sbi->s_resuid == current->fsuid ||
+ ((sbi->s_resgid != 0) && in_group_p(sbi->s_resgid)) ||
+ capable(CAP_SYS_RESOURCE)) {
+ if (free_blocks >= (nblocks + dirty_blocks))
+ return 1;
+ }
- /* Add the blocks to nblocks */
- percpu_counter_add(dbc, nblocks);
return 0;
}
-/**
- * ext4_has_free_blocks()
- * @sbi: in-core super block structure.
- * @nblocks: number of neeed blocks
- *
- * Check if filesystem has free blocks available for allocation.
- * Return the number of blocks avaible for allocation for this request
- * On success, return nblocks
- */
-ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
+int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
s64 nblocks)
{
- s64 free_blocks, dirty_blocks;
- s64 root_blocks = 0;
- struct percpu_counter *fbc = &sbi->s_freeblocks_counter;
- struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter;
-
- free_blocks = percpu_counter_read_positive(fbc);
- dirty_blocks = percpu_counter_read_positive(dbc);
-
- if (!capable(CAP_SYS_RESOURCE) &&
- sbi->s_resuid != current->fsuid &&
- (sbi->s_resgid == 0 || !in_group_p(sbi->s_resgid)))
- root_blocks = ext4_r_blocks_count(sbi->s_es);
-
- if (free_blocks - (nblocks + root_blocks + dirty_blocks) <
- EXT4_FREEBLOCKS_WATERMARK) {
- free_blocks = percpu_counter_sum(fbc);
- dirty_blocks = percpu_counter_sum(dbc);
- }
- if (free_blocks <= (root_blocks + dirty_blocks))
- /* we don't have free space */
+ if (ext4_has_free_blocks(sbi, nblocks)) {
+ percpu_counter_add(&sbi->s_dirtyblocks_counter, nblocks);
return 0;
-
- if (free_blocks - (root_blocks + dirty_blocks) < nblocks)
- return free_blocks - (root_blocks + dirty_blocks);
- return nblocks;
+ } else
+ return -ENOSPC;
}
-
/**
* ext4_should_retry_alloc()
* @sb: super block
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