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linux-sg2042
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[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: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2005-06-22 17:16:30 +00:00
parent 951a143b3f
commit 7d52e86274
3 changed files with 39 additions and 18 deletions
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12
fs/nfs/file.c
View File

@ -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);
if (result)
goto out;
/*
* 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)

44
fs/nfs/inode.c
View File

@ -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

1
include/linux/nfs_fs.h
View File

@ -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 *);