diff options
author | David Howells <dhowells@redhat.com> | 2024-04-04 17:05:19 +0200 |
---|---|---|
committer | Steve French <stfrench@microsoft.com> | 2024-04-19 22:37:47 +0200 |
commit | dad80c6bff770d25f67ec25fe011730e4a463008 (patch) | |
tree | 5fc5557eddfaeecaa96f2bf41a8954f38fc2d66b /fs/smb | |
parent | Linux 6.9-rc4 (diff) | |
download | linux-dad80c6bff770d25f67ec25fe011730e4a463008.tar.xz linux-dad80c6bff770d25f67ec25fe011730e4a463008.zip |
cifs: Fix reacquisition of volume cookie on still-live connection
During mount, cifs_mount_get_tcon() gets a tcon resource connection record
and then attaches an fscache volume cookie to it. However, it does this
irrespective of whether or not the tcon returned from cifs_get_tcon() is a
new record or one that's already in use. This leads to a warning about a
volume cookie collision and a leaked volume cookie because tcon->fscache
gets reset.
Fix this be adding a mutex and a "we've already tried this" flag and only
doing it once for the lifetime of the tcon.
[!] Note: Looking at cifs_mount_get_tcon(), a more general solution may
actually be required. Reacquiring the volume cookie isn't the only thing
that function does: it also partially reinitialises the tcon record without
any locking - which may cause live filesystem ops already using the tcon
through a previous mount to malfunction.
This can be reproduced simply by something like:
mount //example.com/test /xfstest.test -o user=shares,pass=xxx,fsc
mount //example.com/test /mnt -o user=shares,pass=xxx,fsc
Fixes: 70431bfd825d ("cifs: Support fscache indexing rewrite")
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
cc: Shyam Prasad N <sprasad@microsoft.com>
cc: linux-cifs@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/smb')
-rw-r--r-- | fs/smb/client/cifsglob.h | 2 | ||||
-rw-r--r-- | fs/smb/client/fscache.c | 13 | ||||
-rw-r--r-- | fs/smb/client/misc.c | 3 |
3 files changed, 18 insertions, 0 deletions
diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h index d6669ce4ae87..fc09d1c0ee07 100644 --- a/fs/smb/client/cifsglob.h +++ b/fs/smb/client/cifsglob.h @@ -1276,7 +1276,9 @@ struct cifs_tcon { __u32 max_cached_dirs; #ifdef CONFIG_CIFS_FSCACHE u64 resource_id; /* server resource id */ + bool fscache_acquired; /* T if we've tried acquiring a cookie */ struct fscache_volume *fscache; /* cookie for share */ + struct mutex fscache_lock; /* Prevent regetting a cookie */ #endif struct list_head pending_opens; /* list of incomplete opens */ struct cached_fids *cfids; diff --git a/fs/smb/client/fscache.c b/fs/smb/client/fscache.c index 340efce8f052..113bde8f1e61 100644 --- a/fs/smb/client/fscache.c +++ b/fs/smb/client/fscache.c @@ -43,12 +43,23 @@ int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) char *key; int ret = -ENOMEM; + if (tcon->fscache_acquired) + return 0; + + mutex_lock(&tcon->fscache_lock); + if (tcon->fscache_acquired) { + mutex_unlock(&tcon->fscache_lock); + return 0; + } + tcon->fscache_acquired = true; + tcon->fscache = NULL; switch (sa->sa_family) { case AF_INET: case AF_INET6: break; default: + mutex_unlock(&tcon->fscache_lock); cifs_dbg(VFS, "Unknown network family '%d'\n", sa->sa_family); return -EINVAL; } @@ -57,6 +68,7 @@ int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) sharename = extract_sharename(tcon->tree_name); if (IS_ERR(sharename)) { + mutex_unlock(&tcon->fscache_lock); cifs_dbg(FYI, "%s: couldn't extract sharename\n", __func__); return PTR_ERR(sharename); } @@ -90,6 +102,7 @@ out_2: kfree(key); out: kfree(sharename); + mutex_unlock(&tcon->fscache_lock); return ret; } diff --git a/fs/smb/client/misc.c b/fs/smb/client/misc.c index 7d15a1969b81..ad44f8d66b37 100644 --- a/fs/smb/client/misc.c +++ b/fs/smb/client/misc.c @@ -139,6 +139,9 @@ tcon_info_alloc(bool dir_leases_enabled) atomic_set(&ret_buf->num_local_opens, 0); atomic_set(&ret_buf->num_remote_opens, 0); ret_buf->stats_from_time = ktime_get_real_seconds(); +#ifdef CONFIG_CIFS_FSCACHE + mutex_init(&ret_buf->fscache_lock); +#endif return ret_buf; } |