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-rw-r--r--mm/shmem.c60
1 files changed, 16 insertions, 44 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index ff6713a..8f8534f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1269,9 +1269,9 @@ repeat:
goto failed;
radix_tree_preload_end();
if (sgp != SGP_READ && !prealloc_page) {
- /* We don't care if this fails */
prealloc_page = shmem_alloc_page(gfp, info, idx);
if (prealloc_page) {
+ SetPageSwapBacked(prealloc_page);
if (mem_cgroup_cache_charge(prealloc_page,
current->mm, GFP_KERNEL)) {
page_cache_release(prealloc_page);
@@ -1403,7 +1403,8 @@ repeat:
goto repeat;
}
spin_unlock(&info->lock);
- } else {
+
+ } else if (prealloc_page) {
shmem_swp_unmap(entry);
sbinfo = SHMEM_SB(inode->i_sb);
if (sbinfo->max_blocks) {
@@ -1419,41 +1420,8 @@ repeat:
if (!filepage) {
int ret;
- if (!prealloc_page) {
- spin_unlock(&info->lock);
- filepage = shmem_alloc_page(gfp, info, idx);
- if (!filepage) {
- spin_lock(&info->lock);
- shmem_unacct_blocks(info->flags, 1);
- shmem_free_blocks(inode, 1);
- spin_unlock(&info->lock);
- error = -ENOMEM;
- goto failed;
- }
- SetPageSwapBacked(filepage);
-
- /*
- * Precharge page while we can wait, compensate
- * after
- */
- error = mem_cgroup_cache_charge(filepage,
- current->mm, GFP_KERNEL);
- if (error) {
- page_cache_release(filepage);
- spin_lock(&info->lock);
- shmem_unacct_blocks(info->flags, 1);
- shmem_free_blocks(inode, 1);
- spin_unlock(&info->lock);
- filepage = NULL;
- goto failed;
- }
-
- spin_lock(&info->lock);
- } else {
- filepage = prealloc_page;
- prealloc_page = NULL;
- SetPageSwapBacked(filepage);
- }
+ filepage = prealloc_page;
+ prealloc_page = NULL;
entry = shmem_swp_alloc(info, idx, sgp, gfp);
if (IS_ERR(entry))
@@ -1492,11 +1460,20 @@ repeat:
SetPageUptodate(filepage);
if (sgp == SGP_DIRTY)
set_page_dirty(filepage);
+ } else {
+ spin_unlock(&info->lock);
+ error = -ENOMEM;
+ goto out;
}
done:
*pagep = filepage;
error = 0;
- goto out;
+out:
+ if (prealloc_page) {
+ mem_cgroup_uncharge_cache_page(prealloc_page);
+ page_cache_release(prealloc_page);
+ }
+ return error;
nospace:
/*
@@ -1520,12 +1497,7 @@ failed:
unlock_page(filepage);
page_cache_release(filepage);
}
-out:
- if (prealloc_page) {
- mem_cgroup_uncharge_cache_page(prealloc_page);
- page_cache_release(prealloc_page);
- }
- return error;
+ goto out;
}
static int shmem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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