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Btrfs: use the inode's mapping mask for allocating pages

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Johannes pointed out we were allocating only kernel pages for doing writes,
which is kind of a big deal if you are on 32bit and have more than a gig of ram.
So fix our allocations to use the mapping's gfp but still clear __GFP_FS so we
don't re-enter.  Thanks,

Reported-by: Johannes Weiner <jweiner@redhat.com>
Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik 2011-09-21 15:05:58 -04:00
parent 455757c322
commit 3b16a4e3c3
6 changed files with 18 additions and 6 deletions
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6
fs/btrfs/ctree.h
View File

@ -30,6 +30,7 @@
#include <linux/kobject.h>
#include <trace/events/btrfs.h>
#include <asm/kmap_types.h>
#include <linux/pagemap.h>
#include "extent_io.h"
#include "extent_map.h"
#include "async-thread.h"
@ -2117,6 +2118,11 @@ static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
(space_info->flags & BTRFS_BLOCK_GROUP_DATA));
}
static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
{
return mapping_gfp_mask(mapping) & ~__GFP_FS;
}
/* extent-tree.c */
static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
unsigned num_items)

3
fs/btrfs/file.c
View File

@ -1069,6 +1069,7 @@ static noinline int prepare_pages(struct btrfs_root *root, struct file *file,
int i;
unsigned long index = pos >> PAGE_CACHE_SHIFT;
struct inode *inode = fdentry(file)->d_inode;
gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
int err = 0;
int faili = 0;
u64 start_pos;
@ -1080,7 +1081,7 @@ static noinline int prepare_pages(struct btrfs_root *root, struct file *file,
again:
for (i = 0; i < num_pages; i++) {
pages[i] = find_or_create_page(inode->i_mapping, index + i,
GFP_NOFS);
mask);
if (!pages[i]) {
faili = i - 1;
err = -ENOMEM;

6
fs/btrfs/free-space-cache.c
View File

@ -254,6 +254,7 @@ int __load_free_space_cache(struct btrfs_root *root, struct inode *inode,
u64 num_bitmaps;
u64 generation;
pgoff_t index = 0;
gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
int ret = 0;
INIT_LIST_HEAD(&bitmaps);
@ -310,7 +311,7 @@ int __load_free_space_cache(struct btrfs_root *root, struct inode *inode,
if (!num_entries && !num_bitmaps)
break;
page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
page = find_or_create_page(inode->i_mapping, index, mask);
if (!page)
goto free_cache;
@ -563,6 +564,7 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode,
u64 start, end, len;
u64 bytes = 0;
u32 crc = ~(u32)0;
gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
int index = 0, num_pages = 0;
int entries = 0;
int bitmaps = 0;
@ -612,7 +614,7 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode,
* know and don't freak out.
*/
while (index < num_pages) {
page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
page = find_or_create_page(inode->i_mapping, index, mask);
if (!page) {
int i;

3
fs/btrfs/inode.c
View File

@ -3282,6 +3282,7 @@ static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
pgoff_t index = from >> PAGE_CACHE_SHIFT;
unsigned offset = from & (PAGE_CACHE_SIZE-1);
struct page *page;
gfp_t mask = btrfs_alloc_write_mask(mapping);
int ret = 0;
u64 page_start;
u64 page_end;
@ -3294,7 +3295,7 @@ static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
ret = -ENOMEM;
again:
page = find_or_create_page(mapping, index, GFP_NOFS);
page = find_or_create_page(mapping, index, mask);
if (!page) {
btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE);
goto out;

3
fs/btrfs/ioctl.c
View File

@ -843,6 +843,7 @@ static int cluster_pages_for_defrag(struct inode *inode,
int i_done;
struct btrfs_ordered_extent *ordered;
struct extent_state *cached_state = NULL;
gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
if (isize == 0)
return 0;
@ -860,7 +861,7 @@ again:
for (i = 0; i < num_pages; i++) {
struct page *page;
page = find_or_create_page(inode->i_mapping,
start_index + i, GFP_NOFS);
start_index + i, mask);
if (!page)
break;

3
fs/btrfs/relocation.c
View File

@ -2921,6 +2921,7 @@ static int relocate_file_extent_cluster(struct inode *inode,
unsigned long last_index;
struct page *page;
struct file_ra_state *ra;
gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
int nr = 0;
int ret = 0;
@ -2955,7 +2956,7 @@ static int relocate_file_extent_cluster(struct inode *inode,
ra, NULL, index,
last_index + 1 - index);
page = find_or_create_page(inode->i_mapping, index,
GFP_NOFS);
mask);
if (!page) {
btrfs_delalloc_release_metadata(inode,
PAGE_CACHE_SIZE);