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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
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commit
fc71ff8a6c
@ -27,6 +27,7 @@
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#include <linux/pagemap.h>
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#include <linux/aio.h>
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#include <linux/gfp.h>
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#include <linux/swap.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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@ -493,11 +494,19 @@ static void nfs_invalidate_page(struct page *page, unsigned long offset)
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*/
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static int nfs_release_page(struct page *page, gfp_t gfp)
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{
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struct address_space *mapping = page->mapping;
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dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
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/* Only do I/O if gfp is a superset of GFP_KERNEL */
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if ((gfp & GFP_KERNEL) == GFP_KERNEL)
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nfs_wb_page(page->mapping->host, page);
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if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) {
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int how = FLUSH_SYNC;
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/* Don't let kswapd deadlock waiting for OOM RPC calls */
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if (current_is_kswapd())
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how = 0;
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nfs_commit_inode(mapping->host, how);
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}
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/* If PagePrivate() is set, then the page is not freeable */
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if (PagePrivate(page))
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return 0;
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@ -105,7 +105,7 @@ static char nfs_root_name[256] __initdata = "";
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static __be32 servaddr __initdata = 0;
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/* Name of directory to mount */
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static char nfs_export_path[NFS_MAXPATHLEN] __initdata = { 0, };
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static char nfs_export_path[NFS_MAXPATHLEN + 1] __initdata = { 0, };
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/* NFS-related data */
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static struct nfs_mount_data nfs_data __initdata = { 0, };/* NFS mount info */
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@ -222,7 +222,7 @@ static void nfs_end_page_writeback(struct page *page)
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clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
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}
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static struct nfs_page *nfs_find_and_lock_request(struct page *page)
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static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock)
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{
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struct inode *inode = page->mapping->host;
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struct nfs_page *req;
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@ -241,7 +241,10 @@ static struct nfs_page *nfs_find_and_lock_request(struct page *page)
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* request as dirty (in which case we don't care).
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*/
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spin_unlock(&inode->i_lock);
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ret = nfs_wait_on_request(req);
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if (!nonblock)
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ret = nfs_wait_on_request(req);
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else
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ret = -EAGAIN;
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nfs_release_request(req);
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if (ret != 0)
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return ERR_PTR(ret);
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@ -256,12 +259,12 @@ static struct nfs_page *nfs_find_and_lock_request(struct page *page)
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* May return an error if the user signalled nfs_wait_on_request().
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*/
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static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
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struct page *page)
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struct page *page, bool nonblock)
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{
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struct nfs_page *req;
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int ret = 0;
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req = nfs_find_and_lock_request(page);
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req = nfs_find_and_lock_request(page, nonblock);
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if (!req)
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goto out;
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ret = PTR_ERR(req);
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@ -283,12 +286,20 @@ out:
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static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
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{
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struct inode *inode = page->mapping->host;
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int ret;
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nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
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nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
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nfs_pageio_cond_complete(pgio, page->index);
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return nfs_page_async_flush(pgio, page);
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ret = nfs_page_async_flush(pgio, page,
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wbc->sync_mode == WB_SYNC_NONE ||
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wbc->nonblocking != 0);
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if (ret == -EAGAIN) {
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redirty_page_for_writepage(wbc, page);
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ret = 0;
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}
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return ret;
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}
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/*
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@ -1379,7 +1390,7 @@ static const struct rpc_call_ops nfs_commit_ops = {
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.rpc_release = nfs_commit_release,
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};
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static int nfs_commit_inode(struct inode *inode, int how)
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int nfs_commit_inode(struct inode *inode, int how)
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{
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LIST_HEAD(head);
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int may_wait = how & FLUSH_SYNC;
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@ -1443,7 +1454,7 @@ out_mark_dirty:
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return ret;
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}
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#else
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static int nfs_commit_inode(struct inode *inode, int how)
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int nfs_commit_inode(struct inode *inode, int how)
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{
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return 0;
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}
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@ -1546,7 +1557,7 @@ int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
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nfs_fscache_release_page(page, GFP_KERNEL);
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req = nfs_find_and_lock_request(page);
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req = nfs_find_and_lock_request(page, false);
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ret = PTR_ERR(req);
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if (IS_ERR(req))
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goto out;
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@ -493,6 +493,7 @@ extern int nfs_wb_all(struct inode *inode);
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extern int nfs_wb_page(struct inode *inode, struct page* page);
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extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
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#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
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extern int nfs_commit_inode(struct inode *, int);
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extern struct nfs_write_data *nfs_commitdata_alloc(void);
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extern void nfs_commit_free(struct nfs_write_data *wdata);
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#endif
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