aboutsummaryrefslogtreecommitdiffstats
path: root/fs/afs/cache.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/afs/cache.c')
-rw-r--r--fs/afs/cache.c239
1 files changed, 43 insertions, 196 deletions
diff --git a/fs/afs/cache.c b/fs/afs/cache.c
index 1fe855191261..f62ff71d28c9 100644
--- a/fs/afs/cache.c
+++ b/fs/afs/cache.c
@@ -14,19 +14,6 @@
static uint16_t afs_cell_cache_get_key(const void *cookie_netfs_data,
void *buffer, uint16_t buflen);
-static uint16_t afs_cell_cache_get_aux(const void *cookie_netfs_data,
- void *buffer, uint16_t buflen);
-static enum fscache_checkaux afs_cell_cache_check_aux(void *cookie_netfs_data,
- const void *buffer,
- uint16_t buflen);
-
-static uint16_t afs_vlocation_cache_get_key(const void *cookie_netfs_data,
- void *buffer, uint16_t buflen);
-static uint16_t afs_vlocation_cache_get_aux(const void *cookie_netfs_data,
- void *buffer, uint16_t buflen);
-static enum fscache_checkaux afs_vlocation_cache_check_aux(
- void *cookie_netfs_data, const void *buffer, uint16_t buflen);
-
static uint16_t afs_volume_cache_get_key(const void *cookie_netfs_data,
void *buffer, uint16_t buflen);
@@ -42,23 +29,13 @@ static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
struct fscache_netfs afs_cache_netfs = {
.name = "afs",
- .version = 0,
+ .version = 1,
};
struct fscache_cookie_def afs_cell_cache_index_def = {
.name = "AFS.cell",
.type = FSCACHE_COOKIE_TYPE_INDEX,
.get_key = afs_cell_cache_get_key,
- .get_aux = afs_cell_cache_get_aux,
- .check_aux = afs_cell_cache_check_aux,
-};
-
-struct fscache_cookie_def afs_vlocation_cache_index_def = {
- .name = "AFS.vldb",
- .type = FSCACHE_COOKIE_TYPE_INDEX,
- .get_key = afs_vlocation_cache_get_key,
- .get_aux = afs_vlocation_cache_get_aux,
- .check_aux = afs_vlocation_cache_check_aux,
};
struct fscache_cookie_def afs_volume_cache_index_def = {
@@ -95,150 +72,26 @@ static uint16_t afs_cell_cache_get_key(const void *cookie_netfs_data,
return klen;
}
-/*
- * provide new auxiliary cache data
- */
-static uint16_t afs_cell_cache_get_aux(const void *cookie_netfs_data,
- void *buffer, uint16_t bufmax)
-{
- const struct afs_cell *cell = cookie_netfs_data;
- uint16_t dlen;
-
- _enter("%p,%p,%u", cell, buffer, bufmax);
-
- dlen = cell->vl_naddrs * sizeof(cell->vl_addrs[0]);
- dlen = min(dlen, bufmax);
- dlen &= ~(sizeof(cell->vl_addrs[0]) - 1);
-
- memcpy(buffer, cell->vl_addrs, dlen);
- return dlen;
-}
-
-/*
- * check that the auxiliary data indicates that the entry is still valid
- */
-static enum fscache_checkaux afs_cell_cache_check_aux(void *cookie_netfs_data,
- const void *buffer,
- uint16_t buflen)
-{
- _leave(" = OKAY");
- return FSCACHE_CHECKAUX_OKAY;
-}
-
-/*****************************************************************************/
-/*
- * set the key for the index entry
- */
-static uint16_t afs_vlocation_cache_get_key(const void *cookie_netfs_data,
- void *buffer, uint16_t bufmax)
-{
- const struct afs_vlocation *vlocation = cookie_netfs_data;
- uint16_t klen;
-
- _enter("{%s},%p,%u", vlocation->vldb.name, buffer, bufmax);
-
- klen = strnlen(vlocation->vldb.name, sizeof(vlocation->vldb.name));
- if (klen > bufmax)
- return 0;
-
- memcpy(buffer, vlocation->vldb.name, klen);
-
- _leave(" = %u", klen);
- return klen;
-}
-
-/*
- * provide new auxiliary cache data
- */
-static uint16_t afs_vlocation_cache_get_aux(const void *cookie_netfs_data,
- void *buffer, uint16_t bufmax)
-{
- const struct afs_vlocation *vlocation = cookie_netfs_data;
- uint16_t dlen;
-
- _enter("{%s},%p,%u", vlocation->vldb.name, buffer, bufmax);
-
- dlen = sizeof(struct afs_cache_vlocation);
- dlen -= offsetof(struct afs_cache_vlocation, nservers);
- if (dlen > bufmax)
- return 0;
-
- memcpy(buffer, (uint8_t *)&vlocation->vldb.nservers, dlen);
-
- _leave(" = %u", dlen);
- return dlen;
-}
-
-/*
- * check that the auxiliary data indicates that the entry is still valid
- */
-static
-enum fscache_checkaux afs_vlocation_cache_check_aux(void *cookie_netfs_data,
- const void *buffer,
- uint16_t buflen)
-{
- const struct afs_cache_vlocation *cvldb;
- struct afs_vlocation *vlocation = cookie_netfs_data;
- uint16_t dlen;
-
- _enter("{%s},%p,%u", vlocation->vldb.name, buffer, buflen);
-
- /* check the size of the data is what we're expecting */
- dlen = sizeof(struct afs_cache_vlocation);
- dlen -= offsetof(struct afs_cache_vlocation, nservers);
- if (dlen != buflen)
- return FSCACHE_CHECKAUX_OBSOLETE;
-
- cvldb = container_of(buffer, struct afs_cache_vlocation, nservers);
-
- /* if what's on disk is more valid than what's in memory, then use the
- * VL record from the cache */
- if (!vlocation->valid || vlocation->vldb.rtime == cvldb->rtime) {
- memcpy((uint8_t *)&vlocation->vldb.nservers, buffer, dlen);
- vlocation->valid = 1;
- _leave(" = SUCCESS [c->m]");
- return FSCACHE_CHECKAUX_OKAY;
- }
-
- /* need to update the cache if the cached info differs */
- if (memcmp(&vlocation->vldb, buffer, dlen) != 0) {
- /* delete if the volume IDs for this name differ */
- if (memcmp(&vlocation->vldb.vid, &cvldb->vid,
- sizeof(cvldb->vid)) != 0
- ) {
- _leave(" = OBSOLETE");
- return FSCACHE_CHECKAUX_OBSOLETE;
- }
-
- _leave(" = UPDATE");
- return FSCACHE_CHECKAUX_NEEDS_UPDATE;
- }
-
- _leave(" = OKAY");
- return FSCACHE_CHECKAUX_OKAY;
-}
-
/*****************************************************************************/
/*
* set the key for the volume index entry
*/
static uint16_t afs_volume_cache_get_key(const void *cookie_netfs_data,
- void *buffer, uint16_t bufmax)
+ void *buffer, uint16_t bufmax)
{
const struct afs_volume *volume = cookie_netfs_data;
- uint16_t klen;
+ struct {
+ u64 volid;
+ } __packed key;
_enter("{%u},%p,%u", volume->type, buffer, bufmax);
- klen = sizeof(volume->type);
- if (klen > bufmax)
+ if (bufmax < sizeof(key))
return 0;
- memcpy(buffer, &volume->type, sizeof(volume->type));
-
- _leave(" = %u", klen);
- return klen;
-
+ key.volid = volume->vid;
+ memcpy(buffer, &key, sizeof(key));
+ return sizeof(key);
}
/*****************************************************************************/
@@ -249,20 +102,25 @@ static uint16_t afs_vnode_cache_get_key(const void *cookie_netfs_data,
void *buffer, uint16_t bufmax)
{
const struct afs_vnode *vnode = cookie_netfs_data;
- uint16_t klen;
+ struct {
+ u32 vnode_id[3];
+ } __packed key;
_enter("{%x,%x,%llx},%p,%u",
vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version,
buffer, bufmax);
- klen = sizeof(vnode->fid.vnode);
- if (klen > bufmax)
- return 0;
+ /* Allow for a 96-bit key */
+ memset(&key, 0, sizeof(key));
+ key.vnode_id[0] = vnode->fid.vnode;
+ key.vnode_id[1] = 0;
+ key.vnode_id[2] = 0;
- memcpy(buffer, &vnode->fid.vnode, sizeof(vnode->fid.vnode));
+ if (sizeof(key) > bufmax)
+ return 0;
- _leave(" = %u", klen);
- return klen;
+ memcpy(buffer, &key, sizeof(key));
+ return sizeof(key);
}
/*
@@ -280,6 +138,11 @@ static void afs_vnode_cache_get_attr(const void *cookie_netfs_data,
*size = vnode->status.size;
}
+struct afs_vnode_cache_aux {
+ u64 data_version;
+ u32 fid_unique;
+} __packed;
+
/*
* provide new auxiliary cache data
*/
@@ -287,23 +150,21 @@ static uint16_t afs_vnode_cache_get_aux(const void *cookie_netfs_data,
void *buffer, uint16_t bufmax)
{
const struct afs_vnode *vnode = cookie_netfs_data;
- uint16_t dlen;
+ struct afs_vnode_cache_aux aux;
_enter("{%x,%x,%Lx},%p,%u",
vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version,
buffer, bufmax);
- dlen = sizeof(vnode->fid.unique) + sizeof(vnode->status.data_version);
- if (dlen > bufmax)
- return 0;
+ memset(&aux, 0, sizeof(aux));
+ aux.data_version = vnode->status.data_version;
+ aux.fid_unique = vnode->fid.unique;
- memcpy(buffer, &vnode->fid.unique, sizeof(vnode->fid.unique));
- buffer += sizeof(vnode->fid.unique);
- memcpy(buffer, &vnode->status.data_version,
- sizeof(vnode->status.data_version));
+ if (bufmax < sizeof(aux))
+ return 0;
- _leave(" = %u", dlen);
- return dlen;
+ memcpy(buffer, &aux, sizeof(aux));
+ return sizeof(aux);
}
/*
@@ -314,43 +175,29 @@ static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
uint16_t buflen)
{
struct afs_vnode *vnode = cookie_netfs_data;
- uint16_t dlen;
+ struct afs_vnode_cache_aux aux;
_enter("{%x,%x,%llx},%p,%u",
vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version,
buffer, buflen);
+ memcpy(&aux, buffer, sizeof(aux));
+
/* check the size of the data is what we're expecting */
- dlen = sizeof(vnode->fid.unique) + sizeof(vnode->status.data_version);
- if (dlen != buflen) {
- _leave(" = OBSOLETE [len %hx != %hx]", dlen, buflen);
+ if (buflen != sizeof(aux)) {
+ _leave(" = OBSOLETE [len %hx != %zx]", buflen, sizeof(aux));
return FSCACHE_CHECKAUX_OBSOLETE;
}
- if (memcmp(buffer,
- &vnode->fid.unique,
- sizeof(vnode->fid.unique)
- ) != 0) {
- unsigned unique;
-
- memcpy(&unique, buffer, sizeof(unique));
-
+ if (vnode->fid.unique != aux.fid_unique) {
_leave(" = OBSOLETE [uniq %x != %x]",
- unique, vnode->fid.unique);
+ aux.fid_unique, vnode->fid.unique);
return FSCACHE_CHECKAUX_OBSOLETE;
}
- if (memcmp(buffer + sizeof(vnode->fid.unique),
- &vnode->status.data_version,
- sizeof(vnode->status.data_version)
- ) != 0) {
- afs_dataversion_t version;
-
- memcpy(&version, buffer + sizeof(vnode->fid.unique),
- sizeof(version));
-
+ if (vnode->status.data_version != aux.data_version) {
_leave(" = OBSOLETE [vers %llx != %llx]",
- version, vnode->status.data_version);
+ aux.data_version, vnode->status.data_version);
return FSCACHE_CHECKAUX_OBSOLETE;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.