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OpenCloudOS-Kernel
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Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6 

* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
  NFS: Ensure that writepage respects the nonblock flag
  NFS: kswapd must not block in nfs_release_page
  nfs: include space for the NUL in root path
This commit is contained in:
Linus Torvalds 2010-07-30 19:02:21 -07:00
parent 1cf66e1616 cfb506e1d3
commit fc71ff8a6c
4 changed files with 32 additions and 11 deletions
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13
fs/nfs/file.c
View File

@ -27,6 +27,7 @@
#include <linux/pagemap.h>
#include <linux/aio.h>
#include <linux/gfp.h>
#include <linux/swap.h>
#include <asm/uaccess.h>
#include <asm/system.h>
@ -493,11 +494,19 @@ static void nfs_invalidate_page(struct page *page, unsigned long offset)
*/
static int nfs_release_page(struct page *page, gfp_t gfp)
{
struct address_space *mapping = page->mapping;
dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
/* Only do I/O if gfp is a superset of GFP_KERNEL */
if ((gfp & GFP_KERNEL) == GFP_KERNEL)
nfs_wb_page(page->mapping->host, page);
if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) {
int how = FLUSH_SYNC;
/* Don't let kswapd deadlock waiting for OOM RPC calls */
if (current_is_kswapd())
how = 0;
nfs_commit_inode(mapping->host, how);
}
/* If PagePrivate() is set, then the page is not freeable */
if (PagePrivate(page))
return 0;

2
fs/nfs/nfsroot.c
View File

@ -105,7 +105,7 @@ static char nfs_root_name[256] __initdata = "";
static __be32 servaddr __initdata = 0;
/* Name of directory to mount */
static char nfs_export_path[NFS_MAXPATHLEN] __initdata = { 0, };
static char nfs_export_path[NFS_MAXPATHLEN + 1] __initdata = { 0, };
/* NFS-related data */
static struct nfs_mount_data nfs_data __initdata = { 0, };/* NFS mount info */

27
fs/nfs/write.c
View File

@ -222,7 +222,7 @@ static void nfs_end_page_writeback(struct page *page)
clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
}
static struct nfs_page *nfs_find_and_lock_request(struct page *page)
static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock)
{
struct inode *inode = page->mapping->host;
struct nfs_page *req;
@ -241,7 +241,10 @@ static struct nfs_page *nfs_find_and_lock_request(struct page *page)
* request as dirty (in which case we don't care).
*/
spin_unlock(&inode->i_lock);
ret = nfs_wait_on_request(req);
if (!nonblock)
ret = nfs_wait_on_request(req);
else
ret = -EAGAIN;
nfs_release_request(req);
if (ret != 0)
return ERR_PTR(ret);
@ -256,12 +259,12 @@ static struct nfs_page *nfs_find_and_lock_request(struct page *page)
* May return an error if the user signalled nfs_wait_on_request().
*/
static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
struct page *page)
struct page *page, bool nonblock)
{
struct nfs_page *req;
int ret = 0;
req = nfs_find_and_lock_request(page);
req = nfs_find_and_lock_request(page, nonblock);
if (!req)
goto out;
ret = PTR_ERR(req);
@ -283,12 +286,20 @@ out:
static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
{
struct inode *inode = page->mapping->host;
int ret;
nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
nfs_pageio_cond_complete(pgio, page->index);
return nfs_page_async_flush(pgio, page);
ret = nfs_page_async_flush(pgio, page,
wbc->sync_mode == WB_SYNC_NONE ||
wbc->nonblocking != 0);
if (ret == -EAGAIN) {
redirty_page_for_writepage(wbc, page);
ret = 0;
}
return ret;
}
/*
@ -1379,7 +1390,7 @@ static const struct rpc_call_ops nfs_commit_ops = {
.rpc_release = nfs_commit_release,
};
static int nfs_commit_inode(struct inode *inode, int how)
int nfs_commit_inode(struct inode *inode, int how)
{
LIST_HEAD(head);
int may_wait = how & FLUSH_SYNC;
@ -1443,7 +1454,7 @@ out_mark_dirty:
return ret;
}
#else
static int nfs_commit_inode(struct inode *inode, int how)
int nfs_commit_inode(struct inode *inode, int how)
{
return 0;
}
@ -1546,7 +1557,7 @@ int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
nfs_fscache_release_page(page, GFP_KERNEL);
req = nfs_find_and_lock_request(page);
req = nfs_find_and_lock_request(page, false);
ret = PTR_ERR(req);
if (IS_ERR(req))
goto out;

1
include/linux/nfs_fs.h
View File

@ -493,6 +493,7 @@ extern int nfs_wb_all(struct inode *inode);
extern int nfs_wb_page(struct inode *inode, struct page* page);
extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
extern int nfs_commit_inode(struct inode *, int);
extern struct nfs_write_data *nfs_commitdata_alloc(void);
extern void nfs_commit_free(struct nfs_write_data *wdata);
#endif