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Commit 7d52e862 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

[PATCH] NFS: Cleanup of caching code, and slight optimization of writes. 



 Unless we're doing O_APPEND writes, we really don't care about revalidating
 the file length. Just make sure that we catch any page cache invalidations.

 Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 951a143b

fs/nfs/file.c

+9 −3
Original line number Diff line number Diff line
@@ -333,9 +333,15 @@ nfs_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t 
	result = -EBUSY;

	if (IS_SWAPFILE(inode))

		goto out_swapfile;

	result = nfs_revalidate_inode(NFS_SERVER(inode), inode);

	/*

	 * O_APPEND implies that we must revalidate the file length.

	 */

	if (iocb->ki_filp->f_flags & O_APPEND) {

		result = nfs_revalidate_file_size(inode, iocb->ki_filp);

		if (result)

			goto out;

	} else

		nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);



	result = count;

	if (!count)

fs/nfs/inode.c

+29 −15
Original line number Diff line number Diff line
@@ -1062,21 +1062,7 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 
	if (verifier == nfsi->cache_change_attribute)

		nfsi->flags &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);

	/* Do the page cache invalidation */

	if (flags & NFS_INO_INVALID_DATA) {

		if (S_ISREG(inode->i_mode)) {

			if (filemap_fdatawrite(inode->i_mapping) == 0)

				filemap_fdatawait(inode->i_mapping);

			nfs_wb_all(inode);

		}

		nfsi->flags &= ~NFS_INO_INVALID_DATA;

		invalidate_inode_pages2(inode->i_mapping);

		memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));

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

				inode->i_sb->s_id,

				(long long)NFS_FILEID(inode));

		/* This ensures we revalidate dentries */

		nfsi->cache_change_attribute++;

	}

	nfs_revalidate_mapping(inode, inode->i_mapping);

	if (flags & NFS_INO_INVALID_ACL)

		nfs_zap_acl_cache(inode);

	dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
@@ -1115,6 +1101,34 @@ int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 
	return __nfs_revalidate_inode(server, inode);

}



/**

 * nfs_revalidate_mapping - Revalidate the pagecache

 * @inode - pointer to host inode

 * @mapping - pointer to mapping

 */

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

{

	struct nfs_inode *nfsi = NFS_I(inode);



	if (nfsi->flags & NFS_INO_INVALID_DATA) {

		if (S_ISREG(inode->i_mode)) {

			if (filemap_fdatawrite(mapping) == 0)

				filemap_fdatawait(mapping);

			nfs_wb_all(inode);

		}

		invalidate_inode_pages2(mapping);

		nfsi->flags &= ~NFS_INO_INVALID_DATA;

		if (S_ISDIR(inode->i_mode)) {

			memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));

			/* This ensures we revalidate child dentries */

			nfsi->cache_change_attribute++;

		}

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

				inode->i_sb->s_id,

				(long long)NFS_FILEID(inode));

	}

}



/**

 * nfs_begin_data_update

 * @inode - pointer to inode

include/linux/nfs_fs.h

+1 −0
Original line number Diff line number Diff line
@@ -289,6 +289,7 @@ extern int nfs_release(struct inode *, struct file *); 
extern int nfs_attribute_timeout(struct inode *inode);

extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);

extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);

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

extern int nfs_setattr(struct dentry *, struct iattr *);

extern void nfs_begin_attr_update(struct inode *);

extern void nfs_end_attr_update(struct inode *);