revert "percpu counter: clean up percpu_counter_sum_and_set()"

[linux-2.6-omap-h63xx.git] / fs / ext4 / balloc.c

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index b9821be709bddb000077b9a4b15efe34e9392bd0..c17f69bcd7dd10b0f287695a945d7de66c1f918e 100644 (file)
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -589,26 +589,28 @@ 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) {
-               free_blocks  = percpu_counter_sum(fbc);
-               dirty_blocks = percpu_counter_sum(dbc);
+               free_blocks  = percpu_counter_sum_and_set(fbc);
+               dirty_blocks = percpu_counter_sum_and_set(dbc);
                if (dirty_blocks < 0) {
                        printk(KERN_CRIT "Dirty block accounting "
                                        "went wrong %lld\n",
@@ -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