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cifs: add refcounted and timestamped container for holding tcons

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Eventually, we'll need to track the use of tcons on a per-sb basis, so that
we know when it's ok to tear them down. Begin this conversion by adding a
new "tcon_link" struct and accessors that get it. For now, the core data
structures are untouched -- cifs_sb still just points to a single tcon and
the pointers are just cast to deal with the accessor functions. A later
patch will flesh this out.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton
2010-09-29 19:51:11 -04:00
committed by Steve French
parent f3983c2133
commit 7ffec37245
9 changed files with 376 additions and 148 deletions
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21
fs/cifs/cifs_dfs_ref.c
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@@ -306,6 +306,7 @@ cifs_dfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
int xid, i;
int rc = 0;
struct vfsmount *mnt = ERR_PTR(-ENOENT);
struct tcon_link *tlink;
cFYI(1, "in %s", __func__);
BUG_ON(IS_ROOT(dentry));
@@ -315,14 +316,6 @@ cifs_dfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
dput(nd->path.dentry);
nd->path.dentry = dget(dentry);
cifs_sb = CIFS_SB(dentry->d_inode->i_sb);
ses = cifs_sb_tcon(cifs_sb)->ses;
if (!ses) {
rc = -EINVAL;
goto out_err;
}
/*
* The MSDFS spec states that paths in DFS referral requests and
* responses must be prefixed by a single '\' character instead of
@@ -335,10 +328,20 @@ cifs_dfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
goto out_err;
}
rc = get_dfs_path(xid, ses , full_path + 1, cifs_sb->local_nls,
cifs_sb = CIFS_SB(dentry->d_inode->i_sb);
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink)) {
rc = PTR_ERR(tlink);
goto out_err;
}
ses = tlink_tcon(tlink)->ses;
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);
cifs_put_tlink(tlink);
for (i = 0; i < num_referrals; i++) {
int len;
dump_referral(referrals+i);