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9p: Implement TREADLINK operation for 9p2000.L

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Synopsis

	size[4] TReadlink tag[2] fid[4]
	size[4] RReadlink tag[2] target[s]

Description
	Readlink is used to return the contents of the symoblic link
        referred by fid. Contents of symboic link is returned as a
        response.

	target[s] - Contents of the symbolic link referred by fid.

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
M. Mohan Kumar 2010-09-28 19:59:25 +05:30 committed by Eric Van Hensbergen
parent 368c09d2a3
commit 329176cc2c
4 changed files with 86 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
fs/9p/vfs_inode.c
View File

@ -1527,7 +1527,7 @@ static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
if (IS_ERR(fid))
return PTR_ERR(fid);
if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))
if (!v9fs_proto_dotu(v9ses))
return -EBADF;
st = p9_client_stat(fid);
@ -1995,6 +1995,60 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
return err;
}
static int
v9fs_vfs_readlink_dotl(struct dentry *dentry, char *buffer, int buflen)
{
int retval;
struct p9_fid *fid;
char *target = NULL;
P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
retval = -EPERM;
fid = v9fs_fid_lookup(dentry);
if (IS_ERR(fid))
return PTR_ERR(fid);
retval = p9_client_readlink(fid, &target);
if (retval < 0)
return retval;
strncpy(buffer, target, buflen);
P9_DPRINTK(P9_DEBUG_VFS, "%s -> %s\n", dentry->d_name.name, buffer);
retval = strnlen(buffer, buflen);
return retval;
}
/**
* v9fs_vfs_follow_link_dotl - follow a symlink path
* @dentry: dentry for symlink
* @nd: nameidata
*
*/
static void *
v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
{
int len = 0;
char *link = __getname();
P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
if (!link)
link = ERR_PTR(-ENOMEM);
else {
len = v9fs_vfs_readlink_dotl(dentry, link, PATH_MAX);
if (len < 0) {
__putname(link);
link = ERR_PTR(len);
} else
link[min(len, PATH_MAX-1)] = 0;
}
nd_set_link(nd, link);
return NULL;
}
static const struct inode_operations v9fs_dir_inode_operations_dotu = {
.create = v9fs_vfs_create,
.lookup = v9fs_vfs_lookup,
@ -2064,8 +2118,8 @@ static const struct inode_operations v9fs_symlink_inode_operations = {
};
static const struct inode_operations v9fs_symlink_inode_operations_dotl = {
.readlink = generic_readlink,
.follow_link = v9fs_vfs_follow_link,
.readlink = v9fs_vfs_readlink_dotl,
.follow_link = v9fs_vfs_follow_link_dotl,
.put_link = v9fs_vfs_put_link,
.getattr = v9fs_vfs_getattr_dotl,
.setattr = v9fs_vfs_setattr_dotl,

2
include/net/9p/9p.h
View File

@ -153,6 +153,8 @@ enum p9_msg_t {
P9_RMKNOD,
P9_TRENAME = 20,
P9_RRENAME,
P9_TREADLINK = 22,
P9_RREADLINK,
P9_TGETATTR = 24,
P9_RGETATTR,
P9_TSETATTR = 26,

1
include/net/9p/client.h
View File

@ -262,5 +262,6 @@ int p9_is_proto_dotu(struct p9_client *clnt);
int p9_is_proto_dotl(struct p9_client *clnt);
struct p9_fid *p9_client_xattrwalk(struct p9_fid *, const char *, u64 *);
int p9_client_xattrcreate(struct p9_fid *, const char *, u64, int);
int p9_client_readlink(struct p9_fid *fid, char **target);
#endif /* NET_9P_CLIENT_H */

26
net/9p/client.c
View File

@ -1870,3 +1870,29 @@ int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
return err;
}
EXPORT_SYMBOL(p9_client_getlock_dotl);
int p9_client_readlink(struct p9_fid *fid, char **target)
{
int err;
struct p9_client *clnt;
struct p9_req_t *req;
err = 0;
clnt = fid->clnt;
P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
if (IS_ERR(req))
return PTR_ERR(req);
err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
if (err) {
p9pdu_dump(1, req->rc);
goto error;
}
P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
error:
p9_free_req(clnt, req);
return err;
}
EXPORT_SYMBOL(p9_client_readlink);