#include <linux/dcache.h>
#include <linux/mount.h>
#include <linux/namei.h>
+#include <linux/slab.h>
#include <linux/vfs.h>
#include <linux/fs.h>
#include "cifsglob.h"
* Extracts sharename form full UNC.
* i.e. strips from UNC trailing path that is not part of share
* name and fixup missing '\' in the begining of DFS node refferal
- * if neccessary.
- * Returns pointer to share name on success or NULL on error.
+ * if necessary.
+ * Returns pointer to share name on success or ERR_PTR on error.
* Caller is responsible for freeing returned string.
*/
static char *cifs_get_share_name(const char *node_name)
UNC = kmalloc(len+2 /*for term null and additional \ if it's missed */,
GFP_KERNEL);
if (!UNC)
- return NULL;
+ return ERR_PTR(-ENOMEM);
/* get share name and server name */
if (node_name[1] != '\\') {
/* find server name end */
pSep = memchr(UNC+2, '\\', len-2);
if (!pSep) {
- cERROR(1, ("%s: no server name end in node name: %s",
- __func__, node_name));
+ cERROR(1, "%s: no server name end in node name: %s",
+ __func__, node_name);
kfree(UNC);
- return NULL;
+ return ERR_PTR(-EINVAL);
}
/* find sharename end */
/**
- * compose_mount_options - creates mount options for refferral
+ * cifs_compose_mount_options - creates mount options for refferral
* @sb_mountdata: parent/root DFS mount options (template)
- * @dentry: point where we are going to mount
+ * @fullpath: full path in UNC format
* @ref: server's referral
* @devname: pointer for saving device name
*
* Returns: pointer to new mount options or ERR_PTR.
* Caller is responcible for freeing retunrned value if it is not error.
*/
-static char *compose_mount_options(const char *sb_mountdata,
- struct dentry *dentry,
+char *cifs_compose_mount_options(const char *sb_mountdata,
+ const char *fullpath,
const struct dfs_info3_param *ref,
char **devname)
{
int rc;
- char *mountdata;
+ char *mountdata = NULL;
int md_len;
char *tkn_e;
char *srvIP = NULL;
char sep = ',';
int off, noff;
- char *fullpath;
if (sb_mountdata == NULL)
return ERR_PTR(-EINVAL);
*devname = cifs_get_share_name(ref->node_name);
+ if (IS_ERR(*devname)) {
+ rc = PTR_ERR(*devname);
+ *devname = NULL;
+ goto compose_mount_options_err;
+ }
+
rc = dns_resolve_server_name_to_ip(*devname, &srvIP);
if (rc != 0) {
- cERROR(1, ("%s: Failed to resolve server part of %s to IP",
- __func__, *devname));
- mountdata = ERR_PTR(rc);
- goto compose_mount_options_out;
+ cERROR(1, "%s: Failed to resolve server part of %s to IP: %d",
+ __func__, *devname, rc);
+ goto compose_mount_options_err;
}
/* md_len = strlen(...) + 12 for 'sep+prefixpath='
* assuming that we have 'unc=' and 'ip=' in
strlen(ref->node_name) + 12;
mountdata = kzalloc(md_len+1, GFP_KERNEL);
if (mountdata == NULL) {
- mountdata = ERR_PTR(-ENOMEM);
- goto compose_mount_options_out;
+ rc = -ENOMEM;
+ goto compose_mount_options_err;
}
/* copy all options except of unc,ip,prefixpath */
/* find & copy prefixpath */
tkn_e = strchr(ref->node_name + 2, '\\');
- if (tkn_e == NULL) /* invalid unc, missing share name*/
- goto compose_mount_options_out;
+ if (tkn_e == NULL) {
+ /* invalid unc, missing share name*/
+ rc = -EINVAL;
+ goto compose_mount_options_err;
+ }
- fullpath = build_path_from_dentry(dentry);
tkn_e = strchr(tkn_e + 1, '\\');
- if (tkn_e || strlen(fullpath) - (ref->path_consumed)) {
+ if (tkn_e || (strlen(fullpath) - ref->path_consumed)) {
strncat(mountdata, &sep, 1);
strcat(mountdata, "prefixpath=");
if (tkn_e)
strcat(mountdata, tkn_e + 1);
- strcat(mountdata, fullpath + (ref->path_consumed));
+ strcat(mountdata, fullpath + ref->path_consumed);
}
- kfree(fullpath);
- /*cFYI(1,("%s: parent mountdata: %s", __func__,sb_mountdata));*/
- /*cFYI(1, ("%s: submount mountdata: %s", __func__, mountdata ));*/
+ /*cFYI(1, "%s: parent mountdata: %s", __func__,sb_mountdata);*/
+ /*cFYI(1, "%s: submount mountdata: %s", __func__, mountdata );*/
compose_mount_options_out:
kfree(srvIP);
return mountdata;
+
+compose_mount_options_err:
+ kfree(mountdata);
+ mountdata = ERR_PTR(rc);
+ goto compose_mount_options_out;
}
struct vfsmount *mnt;
char *mountdata;
char *devname = NULL;
+ char *fullpath;
cifs_sb = CIFS_SB(dentry->d_inode->i_sb);
- mountdata = compose_mount_options(cifs_sb->mountdata,
- dentry, ref, &devname);
+ /*
+ * this function gives us a path with a double backslash prefix. We
+ * require a single backslash for DFS.
+ */
+ fullpath = build_path_from_dentry(dentry);
+ if (!fullpath)
+ return ERR_PTR(-ENOMEM);
+
+ mountdata = cifs_compose_mount_options(cifs_sb->mountdata,
+ fullpath + 1, ref, &devname);
+ kfree(fullpath);
if (IS_ERR(mountdata))
return (struct vfsmount *)mountdata;
int err;
mntget(newmnt);
- err = do_add_mount(newmnt, &nd->path, nd->path.mnt->mnt_flags, mntlist);
+ err = do_add_mount(newmnt, &nd->path, nd->path.mnt->mnt_flags | MNT_SHRINKABLE, mntlist);
switch (err) {
case 0:
path_put(&nd->path);
case -EBUSY:
/* someone else made a mount here whilst we were busy */
while (d_mountpoint(nd->path.dentry) &&
- follow_down(&nd->path.mnt, &nd->path.dentry))
+ follow_down(&nd->path))
;
err = 0;
default:
static void dump_referral(const struct dfs_info3_param *ref)
{
- cFYI(1, ("DFS: ref path: %s", ref->path_name));
- cFYI(1, ("DFS: node path: %s", ref->node_name));
- cFYI(1, ("DFS: fl: %hd, srv_type: %hd", ref->flags, ref->server_type));
- cFYI(1, ("DFS: ref_flags: %hd, path_consumed: %hd", ref->ref_flag,
- ref->path_consumed));
+ cFYI(1, "DFS: ref path: %s", ref->path_name);
+ cFYI(1, "DFS: node path: %s", ref->node_name);
+ cFYI(1, "DFS: fl: %hd, srv_type: %hd", ref->flags, ref->server_type);
+ cFYI(1, "DFS: ref_flags: %hd, path_consumed: %hd", ref->ref_flag,
+ ref->path_consumed);
}
int rc = 0;
struct vfsmount *mnt = ERR_PTR(-ENOENT);
- cFYI(1, ("in %s", __func__));
+ cFYI(1, "in %s", __func__);
BUG_ON(IS_ROOT(dentry));
xid = GetXid();
goto out_err;
}
+ /*
+ * The MSDFS spec states that paths in DFS referral requests and
+ * responses must be prefixed by a single '\' character instead of
+ * the double backslashes usually used in the UNC. This function
+ * gives us the latter, so we must adjust the result.
+ */
full_path = build_path_from_dentry(dentry);
if (full_path == NULL) {
rc = -ENOMEM;
goto out_err;
}
- rc = get_dfs_path(xid, ses , full_path, cifs_sb->local_nls,
+ rc = get_dfs_path(xid, ses , full_path + 1, cifs_sb->local_nls,
&num_referrals, &referrals,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
for (i = 0; i < num_referrals; i++) {
+ int len;
dump_referral(referrals+i);
- /* connect to a storage node */
- if (referrals[i].flags & DFSREF_STORAGE_SERVER) {
- int len;
- len = strlen(referrals[i].node_name);
- if (len < 2) {
- cERROR(1, ("%s: Net Address path too short: %s",
- __func__, referrals[i].node_name));
- rc = -EINVAL;
- goto out_err;
- }
- mnt = cifs_dfs_do_refmount(nd->path.mnt,
- nd->path.dentry,
- referrals + i);
- cFYI(1, ("%s: cifs_dfs_do_refmount:%s , mnt:%p",
- __func__,
- referrals[i].node_name, mnt));
-
- /* complete mount procedure if we accured submount */
- if (!IS_ERR(mnt))
- break;
+ /* connect to a node */
+ len = strlen(referrals[i].node_name);
+ if (len < 2) {
+ cERROR(1, "%s: Net Address path too short: %s",
+ __func__, referrals[i].node_name);
+ rc = -EINVAL;
+ goto out_err;
}
+ mnt = cifs_dfs_do_refmount(nd->path.mnt,
+ nd->path.dentry, referrals + i);
+ cFYI(1, "%s: cifs_dfs_do_refmount:%s , mnt:%p", __func__,
+ referrals[i].node_name, mnt);
+
+ /* complete mount procedure if we accured submount */
+ if (!IS_ERR(mnt))
+ break;
}
/* we need it cause for() above could exit without valid submount */
if (IS_ERR(mnt))
goto out_err;
- nd->path.mnt->mnt_flags |= MNT_SHRINKABLE;
rc = add_mount_helper(mnt, nd, &cifs_dfs_automount_list);
out:
FreeXid(xid);
free_dfs_info_array(referrals, num_referrals);
kfree(full_path);
- cFYI(1, ("leaving %s" , __func__));
+ cFYI(1, "leaving %s" , __func__);
return ERR_PTR(rc);
out_err:
path_put(&nd->path);
goto out;
}
-struct inode_operations cifs_dfs_referral_inode_operations = {
+const struct inode_operations cifs_dfs_referral_inode_operations = {
.follow_link = cifs_dfs_follow_mountpoint,
};
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff