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cifs: Simplify handling of submount options in cifs_mount.

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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.

Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Sean Finney <seanius@seanius.net>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Sean Finney 2011-04-11 13:19:33 +00:00 committed by Steve French
parent b946845a9d
commit 046462abca
1 changed files with 11 additions and 13 deletions
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24
fs/cifs/connect.c
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@ -2788,9 +2788,9 @@ 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.
@ -2798,7 +2798,7 @@ build_unc_path_to_root(const struct smb_vol *volume_info,
static int
expand_dfs_referral(int xid, struct cifsSesInfo *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;
@ -2826,11 +2826,14 @@ expand_dfs_referral(int xid, struct cifsSesInfo *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;
@ -2853,6 +2856,7 @@ 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) {
@ -2986,7 +2990,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
*/
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;
@ -3028,17 +3032,13 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
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;
@ -3072,8 +3072,6 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
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 accidentally freeing someone elses tcon struct */
if (tcon)