With CONFIG_DFS_UPCALL enabled, maintain the submount options in
cifs_sb->mountdata, simplifying the code just a bit as well as making
corner-case allocation problems less likely.
---
fs/cifs/connect.c | 24 +++++++++++-------------
1 files changed, 11 insertions(+), 13 deletions(-)
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 7d1d0e9..d8e300e 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2756,9 +2756,9 @@ build_unc_path_to_root(const struct smb_vol *volume_info,
/*
* Perform a dfs referral query for a share and (optionally) prefix
*
- * If a referral is found, mount_data will be set to point at a newly
- * allocated string containing updated options for the submount.
- * Otherwise it will be left untouched.
+ * If a referral is found, cifs_sb->mountdata will be (re-)allocated
+ * to a string containing updated options for the submount. Otherwise it
+ * will be left untouched.
*
* Returns the rc from get_dfs_path to the caller, which can be used to
* determine whether there were referrals.
@@ -2766,7 +2766,7 @@ build_unc_path_to_root(const struct smb_vol *volume_info,
static int
expand_dfs_referral(int xid, struct cifs_ses *pSesInfo,
struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
- char **mount_data, int check_prefix)
+ int check_prefix)
{
int rc;
unsigned int num_referrals = 0;
@@ -2794,11 +2794,14 @@ expand_dfs_referral(int xid, struct cifs_ses *pSesInfo,
free_dfs_info_array(referrals, num_referrals);
kfree(fake_devname);
+ if (cifs_sb->mountdata != NULL)
+ kfree(cifs_sb->mountdata);
+
if (IS_ERR(mdata)) {
rc = PTR_ERR(mdata);
mdata = NULL;
}
- *mount_data = mdata;
+ cifs_sb->mountdata = mdata;
}
kfree(full_path);
return rc;
@@ -2821,6 +2824,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info
*cifs_sb,
#ifdef CONFIG_CIFS_DFS_UPCALL
int referral_walks_count = 0;
try_mount_again:
+ mount_data = cifs_sb->mountdata;
/* cleanup activities if we're chasing a referral */
if (referral_walks_count) {
@@ -2954,7 +2958,7 @@ remote_path_check:
*/
if (referral_walks_count == 0) {
int refrc = expand_dfs_referral(xid, pSesInfo, volume_info,
- cifs_sb, &mount_data, false);
+ cifs_sb, false);
if (!refrc) {
referral_walks_count++;
goto try_mount_again;
@@ -2996,17 +3000,13 @@ remote_path_check:
convert_delimiter(cifs_sb->prepath,
CIFS_DIR_SEP(cifs_sb));
- if (mount_data != mount_data_global)
- kfree(mount_data);
-
rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb,
- &mount_data, true);
+ true);
if (!rc) {
referral_walks_count++;
goto try_mount_again;
}
- mount_data = NULL;
goto mount_fail_check;
#else /* No DFS support, return error on mount */
rc = -EOPNOTSUPP;
@@ -3040,8 +3040,6 @@ remote_path_check:
mount_fail_check:
/* on error free sesinfo and tcon struct if needed */
if (rc) {
- if (mount_data != mount_data_global)
- kfree(mount_data);
/* If find_unc succeeded then rc == 0 so we can not end */
/* up accidently freeing someone elses tcon struct */
if (tcon)
--
1.7.2.3
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