diff options
| author | Hugh Dickins <hughd@google.com> | 2011-04-14 15:22:07 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-04-14 16:06:55 -0700 |
| commit | fc5da22ae35d4720be59af8787a8a6d5e4da9517 (patch) | |
| tree | a072d2d1387d19ea5403ab8adaf7c092c1cf6485 /mm | |
| parent | d00ebeac5f24f290636f7a895dafc124b2930a08 (diff) | |
| download | lwn-fc5da22ae35d4720be59af8787a8a6d5e4da9517.tar.gz lwn-fc5da22ae35d4720be59af8787a8a6d5e4da9517.zip | |
tmpfs: fix off-by-one in max_blocks checks
If you fill up a tmpfs, df was showing
tmpfs 460800 - - - /tmp
because of an off-by-one in the max_blocks checks. Fix it so df shows
tmpfs 460800 460800 0 100% /tmp
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/shmem.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index 58da7c150ba6..8fa27e4e582a 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -421,7 +421,8 @@ static swp_entry_t *shmem_swp_alloc(struct shmem_inode_info *info, unsigned long * a waste to allocate index if we cannot allocate data. */ if (sbinfo->max_blocks) { - if (percpu_counter_compare(&sbinfo->used_blocks, (sbinfo->max_blocks - 1)) > 0) + if (percpu_counter_compare(&sbinfo->used_blocks, + sbinfo->max_blocks - 1) >= 0) return ERR_PTR(-ENOSPC); percpu_counter_inc(&sbinfo->used_blocks); spin_lock(&inode->i_lock); @@ -1397,7 +1398,8 @@ repeat: shmem_swp_unmap(entry); sbinfo = SHMEM_SB(inode->i_sb); if (sbinfo->max_blocks) { - if ((percpu_counter_compare(&sbinfo->used_blocks, sbinfo->max_blocks) > 0) || + if (percpu_counter_compare(&sbinfo->used_blocks, + sbinfo->max_blocks) >= 0 || shmem_acct_block(info->flags)) { spin_unlock(&info->lock); error = -ENOSPC; |