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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2011-06-28 15:41:18 +0530
committerEric Van Hensbergen <ericvh@gmail.com>2011-07-23 09:32:52 -0500
commit48e370ff93769ee6e592ddef3bb38686b8147c67 (patch)
tree045a8b0c905be07df33ae06d776e972448a6e447
parent9e8fb38e7d7a00e5f63bbb331f0ea4c02286d5e6 (diff)
downloadlinux-48e370ff93769ee6e592ddef3bb38686b8147c67.tar.bz2
fs/9p: add 9P2000.L unlinkat operation
unlinkat - Remove a directory entry size[4] Tunlinkat tag[2] dirfid[4] name[s] flag[4] size[4] Runlinkat tag[2] older Tremove have the below request format size[4] Tremove tag[2] fid[4] The remove message is used to remove a directory entry either file or directory The remove opreation is actually a directory opertation and should ideally have dirfid, if not we cannot represent the fid on server with anything other than name. We will have to derive the directory name from fid in the Tremove request. NOTE: The operation doesn't clunk the unlink fid. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
-rw-r--r--fs/9p/vfs_inode.c48
-rw-r--r--include/net/9p/9p.h2
-rw-r--r--include/net/9p/client.h1
-rw-r--r--net/9p/client.c23
4 files changed, 56 insertions, 18 deletions
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index bce66f56c62c..8bb5507e822f 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -534,38 +534,50 @@ v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
/**
* v9fs_remove - helper function to remove files and directories
* @dir: directory inode that is being deleted
- * @file: dentry that is being deleted
+ * @dentry: dentry that is being deleted
* @rmdir: removing a directory
*
*/
-static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
+static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
{
- int retval;
- struct p9_fid *v9fid;
- struct inode *file_inode;
-
- P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
- rmdir);
+ struct inode *inode;
+ int retval = -EOPNOTSUPP;
+ struct p9_fid *v9fid, *dfid;
+ struct v9fs_session_info *v9ses;
- file_inode = file->d_inode;
- v9fid = v9fs_fid_clone(file);
- if (IS_ERR(v9fid))
- return PTR_ERR(v9fid);
+ P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
+ dir, dentry, flags);
- retval = p9_client_remove(v9fid);
+ v9ses = v9fs_inode2v9ses(dir);
+ inode = dentry->d_inode;
+ dfid = v9fs_fid_lookup(dentry->d_parent);
+ if (IS_ERR(dfid)) {
+ retval = PTR_ERR(dfid);
+ P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
+ return retval;
+ }
+ if (v9fs_proto_dotl(v9ses))
+ retval = p9_client_unlinkat(dfid, dentry->d_name.name, flags);
+ if (retval == -EOPNOTSUPP) {
+ /* Try the one based on path */
+ v9fid = v9fs_fid_clone(dentry);
+ if (IS_ERR(v9fid))
+ return PTR_ERR(v9fid);
+ retval = p9_client_remove(v9fid);
+ }
if (!retval) {
/*
* directories on unlink should have zero
* link count
*/
- if (rmdir) {
- clear_nlink(file_inode);
+ if (flags & AT_REMOVEDIR) {
+ clear_nlink(inode);
drop_nlink(dir);
} else
- drop_nlink(file_inode);
+ drop_nlink(inode);
- v9fs_invalidate_inode_attr(file_inode);
+ v9fs_invalidate_inode_attr(inode);
v9fs_invalidate_inode_attr(dir);
}
return retval;
@@ -856,7 +868,7 @@ int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
{
- return v9fs_remove(i, d, 1);
+ return v9fs_remove(i, d, AT_REMOVEDIR);
}
/**
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index 61156207c98c..342dcf13d039 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -183,6 +183,8 @@ enum p9_msg_t {
P9_RMKDIR,
P9_TRENAMEAT = 74,
P9_RRENAMEAT,
+ P9_TUNLINKAT = 76,
+ P9_RUNLINKAT,
P9_TVERSION = 100,
P9_RVERSION,
P9_TAUTH = 102,
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index 62ceddf9994a..55ce72ce9861 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -234,6 +234,7 @@ int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
int p9_client_clunk(struct p9_fid *fid);
int p9_client_fsync(struct p9_fid *fid, int datasync);
int p9_client_remove(struct p9_fid *fid);
+int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags);
int p9_client_read(struct p9_fid *fid, char *data, char __user *udata,
u64 offset, u32 count);
int p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
diff --git a/net/9p/client.c b/net/9p/client.c
index c4b77f383582..a953baa3624e 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1303,6 +1303,29 @@ error:
}
EXPORT_SYMBOL(p9_client_remove);
+int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
+{
+ int err = 0;
+ struct p9_req_t *req;
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
+ dfid->fid, name, flags);
+
+ clnt = dfid->clnt;
+ req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+ P9_DPRINTK(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
+
+ p9_free_req(clnt, req);
+error:
+ return err;
+}
+EXPORT_SYMBOL(p9_client_unlinkat);
+
int
p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
u32 count)