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smb3: extend fscache mount volume coherency check

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It is better to check volume id and creation time, not just
the root inode number to verify if the volume has changed
when remounting.

Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Steve French 2020-06-05 17:19:46 -05:00
parent 3803d5e4d3
commit 5865985416
3 changed files with 26 additions and 9 deletions
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9
fs/cifs/cache.c
View File

@ -53,13 +53,6 @@ const struct fscache_cookie_def cifs_fscache_server_index_def = {
.type = FSCACHE_COOKIE_TYPE_INDEX, .type = FSCACHE_COOKIE_TYPE_INDEX,
}; };
/*
* Auxiliary data attached to CIFS superblock within the cache
*/
struct cifs_fscache_super_auxdata {
u64 resource_id; /* unique server resource id */
};
char *extract_sharename(const char *treename) char *extract_sharename(const char *treename)
{ {
const char *src; const char *src;
@ -98,6 +91,8 @@ fscache_checkaux cifs_fscache_super_check_aux(void *cookie_netfs_data,
memset(&auxdata, 0, sizeof(auxdata)); memset(&auxdata, 0, sizeof(auxdata));
auxdata.resource_id = tcon->resource_id; auxdata.resource_id = tcon->resource_id;
auxdata.vol_create_time = tcon->vol_create_time;
auxdata.vol_serial_number = tcon->vol_serial_number;
if (memcmp(data, &auxdata, datalen) != 0) if (memcmp(data, &auxdata, datalen) != 0)
return FSCACHE_CHECKAUX_OBSOLETE; return FSCACHE_CHECKAUX_OBSOLETE;

17
fs/cifs/fscache.c
View File

@ -96,6 +96,7 @@ void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon)
{ {
struct TCP_Server_Info *server = tcon->ses->server; struct TCP_Server_Info *server = tcon->ses->server;
char *sharename; char *sharename;
struct cifs_fscache_super_auxdata auxdata;
sharename = extract_sharename(tcon->treeName); sharename = extract_sharename(tcon->treeName);
if (IS_ERR(sharename)) { if (IS_ERR(sharename)) {
@ -104,11 +105,16 @@ void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon)
return; return;
} }
memset(&auxdata, 0, sizeof(auxdata));
auxdata.resource_id = tcon->resource_id;
auxdata.vol_create_time = tcon->vol_create_time;
auxdata.vol_serial_number = tcon->vol_serial_number;
tcon->fscache = tcon->fscache =
fscache_acquire_cookie(server->fscache, fscache_acquire_cookie(server->fscache,
&cifs_fscache_super_index_def, &cifs_fscache_super_index_def,
sharename, strlen(sharename), sharename, strlen(sharename),
&tcon->resource_id, sizeof(tcon->resource_id), &auxdata, sizeof(auxdata),
tcon, 0, true); tcon, 0, true);
kfree(sharename); kfree(sharename);
cifs_dbg(FYI, "%s: (0x%p/0x%p)\n", cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
@ -117,8 +123,15 @@ void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon)
void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon)
{ {
struct cifs_fscache_super_auxdata auxdata;
memset(&auxdata, 0, sizeof(auxdata));
auxdata.resource_id = tcon->resource_id;
auxdata.vol_create_time = tcon->vol_create_time;
auxdata.vol_serial_number = tcon->vol_serial_number;
cifs_dbg(FYI, "%s: (0x%p)\n", __func__, tcon->fscache); cifs_dbg(FYI, "%s: (0x%p)\n", __func__, tcon->fscache);
fscache_relinquish_cookie(tcon->fscache, &tcon->resource_id, false); fscache_relinquish_cookie(tcon->fscache, &auxdata, false);
tcon->fscache = NULL; tcon->fscache = NULL;
} }

9
fs/cifs/fscache.h
View File

@ -27,6 +27,15 @@
#ifdef CONFIG_CIFS_FSCACHE #ifdef CONFIG_CIFS_FSCACHE
/*
* Auxiliary data attached to CIFS superblock within the cache
*/
struct cifs_fscache_super_auxdata {
u64 resource_id; /* unique server resource id */
__le64 vol_create_time;
u32 vol_serial_number;
} __packed;
/* /*
* Auxiliary data attached to CIFS inode within the cache * Auxiliary data attached to CIFS inode within the cache
*/ */