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Code Issues Releases Wiki Activity

cifs: ignore resource_id while getting fscache super cookie 

We have a cyclic dependency between fscache super cookie
and root inode cookie. The super cookie relies on
tcon->resource_id, which gets populated from the root inode
number. However, fetching the root inode initializes inode
cookie as a child of super cookie, which is yet to be populated.

resource_id is only used as auxdata to check the validity of
super cookie. We can completely avoid setting resource_id to
remove the circular dependency. Since vol creation time and
vol serial numbers are used for auxdata, we should be fine.
Additionally, there will be auxiliary data check for each
inode cookie as well.

Fixes: 5bf91ef03d ("cifs: wait for tcon resource_id before getting fscache super")
CC: David Howells <dhowells@redhat.com>
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Shyam Prasad N 2021-12-08 16:33:19 +00:00 committed by Steve French
parent 2585cf9dfa
commit b774302e88
2 changed files with 7 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
fs/cifs/connect.c
View File

@ -3064,6 +3064,13 @@ static int mount_get_conns(struct mount_ctx *mnt_ctx)
(cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx)))
cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx);
/*
* The cookie is initialized from volume info returned above.
* Inside cifs_fscache_get_super_cookie it checks
* that we do not get super cookie twice.
*/
cifs_fscache_get_super_cookie(tcon);
out:
mnt_ctx->server = server;
mnt_ctx->ses = ses;

13
fs/cifs/inode.c
View File

@ -1356,11 +1356,6 @@ iget_no_retry:
goto out;
}
#ifdef CONFIG_CIFS_FSCACHE
/* populate tcon->resource_id */
tcon->resource_id = CIFS_I(inode)->uniqueid;
#endif
if (rc && tcon->pipe) {
cifs_dbg(FYI, "ipc connection - fake read inode\n");
spin_lock(&inode->i_lock);
@ -1375,14 +1370,6 @@ iget_no_retry:
iget_failed(inode);
inode = ERR_PTR(rc);
}
/*
* The cookie is initialized from volume info returned above.
* Inside cifs_fscache_get_super_cookie it checks
* that we do not get super cookie twice.
*/
cifs_fscache_get_super_cookie(tcon);
out:
kfree(path);
free_xid(xid);