Commit cd9ae2b6 authored by Trond Myklebust's avatar Trond Myklebust Committed by Linus Torvalds
Browse files

[PATCH] NFS: Deal with failure of invalidate_inode_pages2() 



If invalidate_inode_pages2() fails, then it should in principle just be
because the current process was signalled.  In that case, we just want to
ensure that the inode's page cache remains marked as invalid.

Also add a helper to allow the O_DIRECT code to simply mark the page cache as
invalid once it is finished writing, instead of calling
invalidate_inode_pages2() itself.

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 13bbc06a

fs/nfs/dir.c

+4 −2
Original line number Diff line number Diff line
@@ -203,8 +203,10 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page) 
	 * Note: assumes we have exclusive access to this mapping either

	 *	 through inode->i_mutex or some other mechanism.

	 */

	if (page->index == 0)

		invalidate_inode_pages2_range(inode->i_mapping, PAGE_CACHE_SIZE, -1);

	if (page->index == 0 && invalidate_inode_pages2_range(inode->i_mapping, PAGE_CACHE_SIZE, -1) < 0) {

		/* Should never happen */

		nfs_zap_mapping(inode, inode->i_mapping);

	}

	unlock_page(page);

	return 0;

 error:

fs/nfs/direct.c

+2 −11
Original line number Diff line number Diff line
@@ -497,6 +497,7 @@ static void nfs_direct_write_complete(struct nfs_direct_req *dreq, struct inode 
			if (dreq->commit_data != NULL)

				nfs_commit_free(dreq->commit_data);

			nfs_direct_free_writedata(dreq);

			nfs_zap_mapping(inode, inode->i_mapping);

			nfs_direct_complete(dreq);

	}

}
@@ -517,6 +518,7 @@ static void nfs_direct_write_complete(struct nfs_direct_req *dreq, struct inode 
{

	nfs_end_data_update(inode);

	nfs_direct_free_writedata(dreq);

	nfs_zap_mapping(inode, inode->i_mapping);

	nfs_direct_complete(dreq);

}

#endif
@@ -830,17 +832,6 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct iovec *iov, 


	retval = nfs_direct_write(iocb, (unsigned long) buf, count, pos);



	/*

	 * XXX: nfs_end_data_update() already ensures this file's

	 *      cached data is subsequently invalidated.  Do we really

	 *      need to call invalidate_inode_pages2() again here?

	 *

	 *      For aio writes, this invalidation will almost certainly

	 *      occur before the writes complete.  Kind of racey.

	 */

	if (mapping->nrpages)

		invalidate_inode_pages2(mapping);



	if (retval > 0)

		iocb->ki_pos = pos + retval;

fs/nfs/inode.c

+23 −5
Original line number Diff line number Diff line
@@ -131,6 +131,15 @@ void nfs_zap_caches(struct inode *inode) 
	spin_unlock(&inode->i_lock);

}



void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)

{

	if (mapping->nrpages != 0) {

		spin_lock(&inode->i_lock);

		NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;

		spin_unlock(&inode->i_lock);

	}

}



static void nfs_zap_acl_cache(struct inode *inode)

{

	void (*clear_acl_cache)(struct inode *);
@@ -671,13 +680,20 @@ int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 
	if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)

			|| nfs_attribute_timeout(inode))

		ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);

	if (ret < 0)

		goto out;



	if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {

		nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);

		if (S_ISREG(inode->i_mode))

			nfs_sync_mapping(mapping);

		invalidate_inode_pages2(mapping);



		if (mapping->nrpages != 0) {

			if (S_ISREG(inode->i_mode)) {

				ret = nfs_sync_mapping(mapping);

				if (ret < 0)

					goto out;

			}

			ret = invalidate_inode_pages2(mapping);

			if (ret < 0)

				goto out;

		}

		spin_lock(&inode->i_lock);

		nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;

		if (S_ISDIR(inode->i_mode)) {
@@ -687,10 +703,12 @@ int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 
		}

		spin_unlock(&inode->i_lock);



		nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);

		dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",

				inode->i_sb->s_id,

				(long long)NFS_FILEID(inode));

	}

out:

	return ret;

}

include/linux/nfs_fs.h

+1 −0
Original line number Diff line number Diff line
@@ -290,6 +290,7 @@ static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long 
 * linux/fs/nfs/inode.c

 */

extern int nfs_sync_mapping(struct address_space *mapping);

extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);

extern void nfs_zap_caches(struct inode *);

extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,

				struct nfs_fattr *);

CRA Git | Maintained and supported by SUSTech CRA and CCSE