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Subject[PATCH] write errors [2/3] flags
Combine mapping->error and ->gfp_mask into ->flags

diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/drivers/block/loop.c patched/drivers/block/loop.c
--- orig/drivers/block/loop.c 2003-05-29 12:49:24.000000000 -0500
+++ patched/drivers/block/loop.c 2003-05-29 12:52:28.000000000 -0500
@@ -714,8 +714,8 @@
fput(file);
goto out_putf;
}
- lo->old_gfp_mask = inode->i_mapping->gfp_mask;
- inode->i_mapping->gfp_mask = GFP_NOIO;
+ lo->old_gfp_mask = mapping_gfp_mask(inode->i_mapping);
+ mapping_set_gfp_mask(inode->i_mapping, GFP_NOIO);

set_blocksize(bdev, lo_blocksize);

@@ -823,7 +823,7 @@
memset(lo->lo_name, 0, LO_NAME_SIZE);
invalidate_bdev(bdev, 0);
set_capacity(disks[lo->lo_number], 0);
- filp->f_dentry->d_inode->i_mapping->gfp_mask = gfp;
+ mapping_set_gfp_mask(filp->f_dentry->d_inode->i_mapping, gfp);
lo->lo_state = Lo_unbound;
fput(filp);
/* This is safe: open() is still holding a reference. */
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/fs/block_dev.c patched/fs/block_dev.c
--- orig/fs/block_dev.c 2003-05-29 12:49:42.000000000 -0500
+++ patched/fs/block_dev.c 2003-05-29 12:52:28.000000000 -0500
@@ -318,7 +318,7 @@
inode->i_rdev = kdev;
inode->i_bdev = new_bdev;
inode->i_data.a_ops = &def_blk_aops;
- inode->i_data.gfp_mask = GFP_USER;
+ mapping_set_gfp_mask(&inode->i_data, GFP_USER);
inode->i_data.backing_dev_info = &default_backing_dev_info;
spin_lock(&bdev_lock);
bdev = bdfind(dev, head);
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/fs/buffer.c patched/fs/buffer.c
--- orig/fs/buffer.c 2003-05-29 12:52:33.000000000 -0500
+++ patched/fs/buffer.c 2003-05-29 12:52:28.000000000 -0500
@@ -600,7 +600,7 @@
buffer_io_error(bh);
printk(KERN_WARNING "lost page write due to I/O error on %s\n",
bdevname(bh->b_bdev, b));
- page->mapping->error = -EIO;
+ set_bit(AS_EIO, &page->mapping->flags);
clear_buffer_uptodate(bh);
SetPageError(page);
}
@@ -2846,7 +2846,7 @@
do {
check_ttfb_buffer(page, bh);
if (buffer_write_io_error(bh))
- page->mapping->error = -EIO;
+ set_bit(AS_EIO, &page->mapping->flags);
if (buffer_busy(bh))
goto failed;
if (!buffer_uptodate(bh) && !buffer_req(bh))
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/fs/inode.c patched/fs/inode.c
--- orig/fs/inode.c 2003-05-29 12:52:33.000000000 -0500
+++ patched/fs/inode.c 2003-05-29 12:53:07.000000000 -0500
@@ -18,6 +18,7 @@
#include <linux/hash.h>
#include <linux/swap.h>
#include <linux/security.h>
+#include <linux/pagemap.h>
#include <linux/cdev.h>

/*
@@ -142,11 +143,11 @@

mapping->a_ops = &empty_aops;
mapping->host = inode;
- mapping->gfp_mask = GFP_HIGHUSER;
+ mapping->flags = 0;
+ mapping_set_gfp_mask(mapping, GFP_HIGHUSER);
mapping->dirtied_when = 0;
mapping->assoc_mapping = NULL;
mapping->backing_dev_info = &default_backing_dev_info;
- mapping->error = 0;
if (sb->s_bdev)
mapping->backing_dev_info = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
memset(&inode->u, 0, sizeof(inode->u));
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/fs/jfs/inode.c patched/fs/jfs/inode.c
--- orig/fs/jfs/inode.c 2003-04-19 21:48:46.000000000 -0500
+++ patched/fs/jfs/inode.c 2003-05-29 12:52:28.000000000 -0500
@@ -20,6 +20,7 @@
#include <linux/fs.h>
#include <linux/mpage.h>
#include <linux/buffer_head.h>
+#include <linux/pagemap.h>
#include "jfs_incore.h"
#include "jfs_filsys.h"
#include "jfs_imap.h"
@@ -57,7 +58,7 @@
inode->i_op = &jfs_dir_inode_operations;
inode->i_fop = &jfs_dir_operations;
inode->i_mapping->a_ops = &jfs_aops;
- inode->i_mapping->gfp_mask = GFP_NOFS;
+ mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
} else if (S_ISLNK(inode->i_mode)) {
if (inode->i_size >= IDATASIZE) {
inode->i_op = &page_symlink_inode_operations;
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/fs/jfs/jfs_imap.c patched/fs/jfs/jfs_imap.c
--- orig/fs/jfs/jfs_imap.c 2003-04-19 21:48:53.000000000 -0500
+++ patched/fs/jfs/jfs_imap.c 2003-05-29 12:52:28.000000000 -0500
@@ -43,6 +43,7 @@

#include <linux/fs.h>
#include <linux/buffer_head.h>
+#include <linux/pagemap.h>

#include "jfs_incore.h"
#include "jfs_filsys.h"
@@ -504,7 +505,7 @@
}

ip->i_mapping->a_ops = &jfs_aops;
- ip->i_mapping->gfp_mask = GFP_NOFS;
+ mapping_set_gfp_mask(ip->i_mapping, GFP_NOFS);

if ((inum == FILESYSTEM_I) && (JFS_IP(ip)->ipimap == sbi->ipaimap)) {
sbi->gengen = le32_to_cpu(dp->di_gengen);
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/fs/jfs/namei.c patched/fs/jfs/namei.c
--- orig/fs/jfs/namei.c 2003-04-19 21:50:35.000000000 -0500
+++ patched/fs/jfs/namei.c 2003-05-29 12:52:28.000000000 -0500
@@ -257,7 +257,7 @@
ip->i_op = &jfs_dir_inode_operations;
ip->i_fop = &jfs_dir_operations;
ip->i_mapping->a_ops = &jfs_aops;
- ip->i_mapping->gfp_mask = GFP_NOFS;
+ mapping_set_gfp_mask(ip->i_mapping, GFP_NOFS);

insert_inode_hash(ip);
mark_inode_dirty(ip);
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/fs/mpage.c patched/fs/mpage.c
--- orig/fs/mpage.c 2003-05-29 12:52:33.000000000 -0500
+++ patched/fs/mpage.c 2003-05-29 12:52:28.000000000 -0500
@@ -570,8 +570,12 @@
* mapping.
*/
lock_page(page);
- if (page->mapping == mapping)
- mapping->error = *ret;
+ if (page->mapping == mapping) {
+ if (*ret == -EIO)
+ set_bit(AS_EIO, &mapping->flags);
+ else if (*ret == -ENOSPC)
+ set_bit(AS_ENOSPC, &mapping->flags);
+ }
unlock_page(page);
}
out:
@@ -684,8 +688,12 @@
* mapping.
*/
lock_page(page);
- if (page->mapping == mapping)
- mapping->error = ret;
+ if (page->mapping == mapping) {
+ if (ret == -EIO)
+ set_bit(AS_EIO, &mapping->flags);
+ else if (ret == -ENOSPC)
+ set_bit(AS_ENOSPC, &mapping->flags);
+ }
unlock_page(page);
}
} else {
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/fs/open.c patched/fs/open.c
--- orig/fs/open.c 2003-05-29 12:52:33.000000000 -0500
+++ patched/fs/open.c 2003-05-29 12:52:28.000000000 -0500
@@ -20,6 +20,7 @@
#include <linux/mount.h>
#include <linux/vfs.h>
#include <asm/uaccess.h>
+#include <linux/pagemap.h>

#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))

@@ -852,11 +853,10 @@
retval = err;
}

- err = mapping->error;
- if (err && !retval) {
- mapping->error = 0;
- retval = err;
- }
+ if (test_and_clear_bit(AS_ENOSPC, &mapping->flags))
+ retval = -ENOSPC;
+ if (test_and_clear_bit(AS_EIO, &mapping->flags))
+ retval = -EIO;

if (!file_count(filp)) {
printk(KERN_ERR "VFS: Close: file count is 0\n");
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/include/linux/fs.h patched/include/linux/fs.h
--- orig/include/linux/fs.h 2003-05-29 12:52:33.000000000 -0500
+++ patched/include/linux/fs.h 2003-05-29 12:52:28.000000000 -0500
@@ -324,12 +324,11 @@
struct list_head i_mmap_shared; /* list of shared mappings */
struct semaphore i_shared_sem; /* protect both above lists */
unsigned long dirtied_when; /* jiffies of first page dirtying */
- int gfp_mask; /* how to allocate the pages */
+ unsigned long flags; /* error bits/gfp mask */
struct backing_dev_info *backing_dev_info; /* device readahead, etc */
spinlock_t private_lock; /* for use by the address_space */
struct list_head private_list; /* ditto */
struct address_space *assoc_mapping; /* ditto */
- int error; /* write error for fsync */
};

struct block_device {
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/include/linux/gfp.h patched/include/linux/gfp.h
--- orig/include/linux/gfp.h 2003-05-12 14:34:35.000000000 -0500
+++ patched/include/linux/gfp.h 2003-05-29 12:52:28.000000000 -0500
@@ -33,6 +33,9 @@
#define __GFP_NORETRY 0x1000 /* Do not retry. Might fail */
#define __GFP_NO_GROW 0x2000 /* Slab internal usage */

+#define __GFP_BITS_SHIFT 16 /* Room for 16 __GFP_FOO bits */
+#define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1)
+
#define GFP_ATOMIC (__GFP_HIGH)
#define GFP_NOIO (__GFP_WAIT)
#define GFP_NOFS (__GFP_WAIT | __GFP_IO)
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/include/linux/pagemap.h patched/include/linux/pagemap.h
--- orig/include/linux/pagemap.h 2003-05-29 12:52:33.000000000 -0500
+++ patched/include/linux/pagemap.h 2003-05-29 12:52:28.000000000 -0500
@@ -8,7 +8,30 @@
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/highmem.h>
+#include <linux/pagemap.h>
#include <asm/uaccess.h>
+#include <linux/gfp.h>
+
+/*
+ * Bits in mapping->flags. The lower __GFP_BITS_SHIFT bits are the page
+ * allocation mode flags.
+ */
+#define AS_EIO (__GFP_BITS_SHIFT + 0) /* IO error on async write */
+#define AS_ENOSPC (__GFP_BITS_SHIFT + 1) /* ENOSPC on async write */
+
+static inline int mapping_gfp_mask(struct address_space * mapping)
+{
+ return mapping->flags & __GFP_BITS_MASK;
+}
+
+/*
+ * This is non-atomic. Only to be used before the mapping is activated.
+ * Probably needs a barrier...
+ */
+static inline void mapping_set_gfp_mask(struct address_space *m, int mask)
+{
+ m->flags = (m->flags & ~__GFP_BITS_MASK) | mask;
+}

/*
* The page cache can done in larger chunks than
@@ -29,12 +52,12 @@

static inline struct page *page_cache_alloc(struct address_space *x)
{
- return alloc_pages(x->gfp_mask, 0);
+ return alloc_pages(mapping_gfp_mask(x), 0);
}

static inline struct page *page_cache_alloc_cold(struct address_space *x)
{
- return alloc_pages(x->gfp_mask|__GFP_COLD, 0);
+ return alloc_pages(mapping_gfp_mask(x)|__GFP_COLD, 0);
}

typedef int filler_t(void *, struct page *);
@@ -56,7 +79,7 @@
*/
static inline struct page *grab_cache_page(struct address_space *mapping, unsigned long index)
{
- return find_or_create_page(mapping, index, mapping->gfp_mask);
+ return find_or_create_page(mapping, index, mapping_gfp_mask(mapping));
}

extern struct page * grab_cache_page_nowait(struct address_space *mapping,
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/mm/filemap.c patched/mm/filemap.c
--- orig/mm/filemap.c 2003-05-29 12:52:33.000000000 -0500
+++ patched/mm/filemap.c 2003-05-29 12:52:28.000000000 -0500
@@ -201,11 +201,10 @@
spin_unlock(&mapping->page_lock);

/* Check for outstanding write errors */
- if (mapping->error)
- {
- ret = mapping->error;
- mapping->error = 0;
- }
+ if (test_and_clear_bit(AS_ENOSPC, &mapping->flags))
+ ret = -ENOSPC;
+ if (test_and_clear_bit(AS_EIO, &mapping->flags))
+ ret = -EIO;

return ret;
}
@@ -591,7 +590,7 @@
page_cache_release(page);
return NULL;
}
- gfp_mask = mapping->gfp_mask & ~__GFP_FS;
+ gfp_mask = mapping_gfp_mask(mapping) & ~__GFP_FS;
page = alloc_pages(gfp_mask, 0);
if (page && add_to_page_cache_lru(page, mapping, index, gfp_mask)) {
page_cache_release(page);
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/mm/shmem.c patched/mm/shmem.c
--- orig/mm/shmem.c 2003-05-29 12:49:55.000000000 -0500
+++ patched/mm/shmem.c 2003-05-29 12:52:28.000000000 -0500
@@ -318,7 +318,7 @@
spin_unlock(&sbinfo->stat_lock);

spin_unlock(&info->lock);
- page = shmem_dir_alloc(inode->i_mapping->gfp_mask);
+ page = shmem_dir_alloc(mapping_gfp_mask(inode->i_mapping));
if (page) {
clear_highpage(page);
page->nr_swapped = 0;
diff -urN -x genksyms -x '*.ver' -x '.patch*' -x '*.orig' orig/mm/vmscan.c patched/mm/vmscan.c
--- orig/mm/vmscan.c 2003-05-29 12:52:34.000000000 -0500
+++ patched/mm/vmscan.c 2003-05-29 12:52:28.000000000 -0500
@@ -347,13 +347,14 @@
* mapping.
*/
lock_page(page);
- if (page->mapping == mapping)
- mapping->error = res;
+ if (page->mapping == mapping) {
+ if (res == -EIO)
+ set_bit(AS_EIO, &mapping->flags);
+ else if (res == -ENOSPC)
+ set_bit(AS_ENOSPC, &mapping->flags);
+ }
unlock_page(page);
}
- if (res < 0) {
- mapping->error = res;
- }
if (res == WRITEPAGE_ACTIVATE) {
ClearPageReclaim(page);
goto activate_locked;

--
Matt Mackall : http://www.selenic.com : of or relating to the moon
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