On Wed, 6 Apr 2011 16:26:43 +0200
Sean Finney <seanius@xxxxxxxxxxx> wrote:
> 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.
>
> Signed-off-by: Sean Finney <seanius@xxxxxxxxxxx>
> ---
> 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 259fc64..8d2529c 100644
> --- a/fs/cifs/connect.c
> +++ b/fs/cifs/connect.c
> @@ -2785,9 +2785,9 @@ 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.
> @@ -2795,7 +2795,7 @@ 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;
> @@ -2823,11 +2823,14 @@ 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;
> @@ -2850,6 +2853,7 @@ 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) {
> @@ -2983,7 +2987,7 @@ 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;
> @@ -3025,17 +3029,13 @@ 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;
> @@ -3069,8 +3069,6 @@ 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)
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
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