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authorDavid Howells <dhowells@redhat.com>2018-04-04 15:41:28 +0300
committerDavid Howells <dhowells@redhat.com>2018-04-04 15:41:28 +0300
commit402cb8dda949d9b8c0df20ad2527d139faad7ca1 (patch)
tree83cdb77f5490a0990eade886aa7f8dd087864996 /fs/cachefiles/interface.c
parent08c2e3d087840cd1e7141b62d92f3dc897147984 (diff)
downloadlinux-402cb8dda949d9b8c0df20ad2527d139faad7ca1.tar.xz
fscache: Attach the index key and aux data to the cookie
Attach copies of the index key and auxiliary data to the fscache cookie so that: (1) The callbacks to the netfs for this stuff can be eliminated. This can simplify things in the cache as the information is still available, even after the cache has relinquished the cookie. (2) Simplifies the locking requirements of accessing the information as we don't have to worry about the netfs object going away on us. (3) The cache can do lazy updating of the coherency information on disk. As long as the cache is flushed before reboot/poweroff, there's no need to update the coherency info on disk every time it changes. (4) Cookies can be hashed or put in a tree as the index key is easily available. This allows: (a) Checks for duplicate cookies can be made at the top fscache layer rather than down in the bowels of the cache backend. (b) Caching can be added to a netfs object that has a cookie if the cache is brought online after the netfs object is allocated. A certain amount of space is made in the cookie for inline copies of the data, but if it won't fit there, extra memory will be allocated for it. The downside of this is that live cache operation requires more memory. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Anna Schumaker <anna.schumaker@netapp.com> Tested-by: Steve Dickson <steved@redhat.com>
Diffstat (limited to 'fs/cachefiles/interface.c')
-rw-r--r--fs/cachefiles/interface.c38
1 files changed, 24 insertions, 14 deletions
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index 405ebc3932c2..3264dcfdc92a 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -32,7 +32,7 @@ static struct fscache_object *cachefiles_alloc_object(
struct cachefiles_cache *cache;
struct cachefiles_xattr *auxdata;
unsigned keylen, auxlen;
- void *buffer;
+ void *buffer, *p;
char *key;
cache = container_of(_cache, struct cachefiles_cache, cache);
@@ -65,8 +65,12 @@ static struct fscache_object *cachefiles_alloc_object(
if (!buffer)
goto nomem_buffer;
- keylen = cookie->def->get_key(cookie->netfs_data, buffer + 2, 512);
- ASSERTCMP(keylen, <, 512);
+ keylen = cookie->key_len;
+ if (keylen <= sizeof(cookie->inline_key))
+ p = cookie->inline_key;
+ else
+ p = cookie->key;
+ memcpy(buffer + 2, p, keylen);
*(uint16_t *)buffer = keylen;
((char *)buffer)[keylen + 2] = 0;
@@ -80,15 +84,17 @@ static struct fscache_object *cachefiles_alloc_object(
/* get hold of the auxiliary data and prepend the object type */
auxdata = buffer;
- auxlen = 0;
- if (cookie->def->get_aux) {
- auxlen = cookie->def->get_aux(cookie->netfs_data,
- auxdata->data, 511);
- ASSERTCMP(auxlen, <, 511);
+ auxlen = cookie->aux_len;
+ if (auxlen) {
+ if (auxlen <= sizeof(cookie->inline_aux))
+ p = cookie->inline_aux;
+ else
+ p = cookie->aux;
+ memcpy(auxdata->data, p, auxlen);
}
auxdata->len = auxlen + 1;
- auxdata->type = cookie->def->type;
+ auxdata->type = cookie->type;
lookup_data->auxdata = auxdata;
lookup_data->key = key;
@@ -206,6 +212,7 @@ static void cachefiles_update_object(struct fscache_object *_object)
struct cachefiles_cache *cache;
struct fscache_cookie *cookie;
const struct cred *saved_cred;
+ const void *aux;
unsigned auxlen;
_enter("{OBJ%x}", _object->debug_id);
@@ -220,26 +227,29 @@ static void cachefiles_update_object(struct fscache_object *_object)
}
cookie = object->fscache.cookie;
+ auxlen = cookie->aux_len;
- if (!cookie->def->get_aux) {
+ if (!auxlen) {
fscache_unuse_cookie(_object);
_leave(" [no aux]");
return;
}
- auxdata = kmalloc(2 + 512 + 3, cachefiles_gfp);
+ auxdata = kmalloc(2 + auxlen + 3, cachefiles_gfp);
if (!auxdata) {
fscache_unuse_cookie(_object);
_leave(" [nomem]");
return;
}
- auxlen = cookie->def->get_aux(cookie->netfs_data, auxdata->data, 511);
+ aux = (auxlen <= sizeof(cookie->inline_aux)) ?
+ cookie->inline_aux : cookie->aux;
+
+ memcpy(auxdata->data, aux, auxlen);
fscache_unuse_cookie(_object);
- ASSERTCMP(auxlen, <, 511);
auxdata->len = auxlen + 1;
- auxdata->type = cookie->def->type;
+ auxdata->type = cookie->type;
cachefiles_begin_secure(cache, &saved_cred);
cachefiles_update_object_xattr(object, auxdata);