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authorJ. Bruce Fields <bfields@citi.umich.edu>2005-06-22 17:16:23 +0000
committerTrond Myklebust <Trond.Myklebust@netapp.com>2005-06-22 16:07:15 -0400
commite50a1c2e1f816c81eed6a589019052cb44189267 (patch)
treee59dd290e136bd0eb5fc56d325bf34f5ca1efdfb /fs/nfs/nfs4proc.c
parent4b580ee3dc00f9828a9a7aad2724f448fdc94075 (diff)
downloadlinux-e50a1c2e1f816c81eed6a589019052cb44189267.tar.bz2
[PATCH] NFSv4: client-side caching NFSv4 ACLs
Add nfs4_acl field to the nfs_inode, and use it to cache acls. Only cache acls of size up to a page. Also prepare for up to a page of acl data even when the user doesn't pass in a buffer, as when they want to get the acl length to decide what size buffer to allocate. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/nfs4proc.c')
-rw-r--r--fs/nfs/nfs4proc.c129
1 files changed, 120 insertions, 9 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index d969dd13e7db..128d01cfea19 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2188,9 +2188,75 @@ static void buf_to_pages(const void *buf, size_t buflen,
}
}
-static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
+struct nfs4_cached_acl {
+ int cached;
+ size_t len;
+ char data[];
+};
+
+static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ spin_lock(&inode->i_lock);
+ kfree(nfsi->nfs4_acl);
+ nfsi->nfs4_acl = acl;
+ spin_unlock(&inode->i_lock);
+}
+
+static void nfs4_zap_acl_attr(struct inode *inode)
+{
+ nfs4_set_cached_acl(inode, NULL);
+}
+
+static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ struct nfs4_cached_acl *acl;
+ int ret = -ENOENT;
+
+ spin_lock(&inode->i_lock);
+ acl = nfsi->nfs4_acl;
+ if (acl == NULL)
+ goto out;
+ if (buf == NULL) /* user is just asking for length */
+ goto out_len;
+ if (acl->cached == 0)
+ goto out;
+ ret = -ERANGE; /* see getxattr(2) man page */
+ if (acl->len > buflen)
+ goto out;
+ memcpy(buf, acl->data, acl->len);
+out_len:
+ ret = acl->len;
+out:
+ spin_unlock(&inode->i_lock);
+ return ret;
+}
+
+static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
+{
+ struct nfs4_cached_acl *acl;
+
+ if (buf && acl_len <= PAGE_SIZE) {
+ acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
+ if (acl == NULL)
+ goto out;
+ acl->cached = 1;
+ memcpy(acl->data, buf, acl_len);
+ } else {
+ acl = kmalloc(sizeof(*acl), GFP_KERNEL);
+ if (acl == NULL)
+ goto out;
+ acl->cached = 0;
+ }
+ acl->len = acl_len;
+out:
+ nfs4_set_cached_acl(inode, acl);
+}
+
+static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
{
- struct nfs_server *server = NFS_SERVER(inode);
struct page *pages[NFS4ACL_MAXPAGES];
struct nfs_getaclargs args = {
.fh = NFS_FH(inode),
@@ -2198,24 +2264,66 @@ static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
.acl_len = buflen,
};
size_t resp_len = buflen;
+ void *resp_buf;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
.rpc_argp = &args,
.rpc_resp = &resp_len,
};
+ struct page *localpage = NULL;
int ret;
- if (!nfs4_server_supports_acls(server))
- return -EOPNOTSUPP;
- buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
+ if (buflen < PAGE_SIZE) {
+ /* As long as we're doing a round trip to the server anyway,
+ * let's be prepared for a page of acl data. */
+ localpage = alloc_page(GFP_KERNEL);
+ resp_buf = page_address(localpage);
+ if (localpage == NULL)
+ return -ENOMEM;
+ args.acl_pages[0] = localpage;
+ args.acl_pgbase = 0;
+ args.acl_len = PAGE_SIZE;
+ } else {
+ resp_buf = buf;
+ buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
+ }
ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
- if (buflen && resp_len > buflen)
- return -ERANGE;
- if (ret == 0)
- ret = resp_len;
+ if (ret)
+ goto out_free;
+ if (resp_len > args.acl_len)
+ nfs4_write_cached_acl(inode, NULL, resp_len);
+ else
+ nfs4_write_cached_acl(inode, resp_buf, resp_len);
+ if (buf) {
+ ret = -ERANGE;
+ if (resp_len > buflen)
+ goto out_free;
+ if (localpage)
+ memcpy(buf, resp_buf, resp_len);
+ }
+ ret = resp_len;
+out_free:
+ if (localpage)
+ __free_page(localpage);
return ret;
}
+static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
+{
+ struct nfs_server *server = NFS_SERVER(inode);
+ int ret;
+
+ if (!nfs4_server_supports_acls(server))
+ return -EOPNOTSUPP;
+ ret = nfs_revalidate_inode(server, inode);
+ if (ret < 0)
+ return ret;
+ ret = nfs4_read_cached_acl(inode, buf, buflen);
+ if (ret != -ENOENT)
+ return ret;
+ return nfs4_get_acl_uncached(inode, buf, buflen);
+}
+
static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
{
struct nfs_server *server = NFS_SERVER(inode);
@@ -2236,6 +2344,8 @@ static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen
return -EOPNOTSUPP;
buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
+ if (ret == 0)
+ nfs4_write_cached_acl(inode, buf, buflen);
return ret;
}
@@ -2907,6 +3017,7 @@ struct nfs_rpc_ops nfs_v4_clientops = {
.file_open = nfs4_proc_file_open,
.file_release = nfs4_proc_file_release,
.lock = nfs4_proc_lock,
+ .clear_acl_cache = nfs4_zap_acl_attr,
};
/*