tmpfs: fix off-by-one in max_blocks checks

[pandora-kernel.git] / mm / shmem.c

diff --git a/mm/shmem.c b/mm/shmem.c
index 048a95a..8fa27e4 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -224,7 +224,6 @@ static const struct vm_operations_struct shmem_vm_ops;
 static struct backing_dev_info shmem_backing_dev_info  __read_mostly = {
        .ra_pages       = 0,    /* No readahead */
        .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK | BDI_CAP_SWAP_BACKED,
-       .unplug_io_fn   = default_unplug_io_fn,
 };
 
 static LIST_HEAD(shmem_swaplist);
@@ -422,7 +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);
@@ -1081,7 +1081,7 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
        shmem_recalc_inode(inode);
 
        if (swap.val && add_to_swap_cache(page, swap, GFP_ATOMIC) == 0) {
-               remove_from_page_cache(page);
+               delete_from_page_cache(page);
                shmem_swp_set(info, entry, swap.val);
                shmem_swp_unmap(entry);
                if (list_empty(&info->swaplist))
@@ -1091,7 +1091,6 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
                spin_unlock(&info->lock);
                swap_shmem_alloc(swap);
                BUG_ON(page_mapped(page));
-               page_cache_release(page);       /* pagecache ref */
                swap_writepage(page, wbc);
                if (inode) {
                        mutex_lock(&shmem_swaplist_mutex);
@@ -1399,7 +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;
@@ -2794,5 +2794,6 @@ int shmem_zero_setup(struct vm_area_struct *vma)
                fput(vma->vm_file);
        vma->vm_file = file;
        vma->vm_ops = &shmem_vm_ops;
+       vma->vm_flags |= VM_CAN_NONLINEAR;
        return 0;
 }