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Diffstat (limited to 'fs/afs/callback.c')
-rw-r--r--fs/afs/callback.c286
1 files changed, 43 insertions, 243 deletions
diff --git a/fs/afs/callback.c b/fs/afs/callback.c
index 282dbac84435..b4cb9bb63f0a 100644
--- a/fs/afs/callback.c
+++ b/fs/afs/callback.c
@@ -21,185 +21,6 @@
#include "internal.h"
/*
- * Create volume and callback interests on a server.
- */
-static struct afs_cb_interest *afs_create_interest(struct afs_server *server,
- struct afs_vnode *vnode)
-{
- struct afs_vol_interest *new_vi, *vi;
- struct afs_cb_interest *new;
- struct rb_node *parent, **pp;
-
- new_vi = kzalloc(sizeof(struct afs_vol_interest), GFP_KERNEL);
- if (!new_vi)
- return NULL;
-
- new = kzalloc(sizeof(struct afs_cb_interest), GFP_KERNEL);
- if (!new) {
- kfree(new_vi);
- return NULL;
- }
-
- new_vi->usage = 1;
- new_vi->vid = vnode->volume->vid;
- INIT_HLIST_HEAD(&new_vi->cb_interests);
-
- refcount_set(&new->usage, 1);
- new->sb = vnode->vfs_inode.i_sb;
- new->server = afs_get_server(server, afs_server_trace_get_new_cbi);
- INIT_HLIST_NODE(&new->cb_vlink);
-
- write_seqlock(&server->cb_break_lock);
-
- pp = &server->cb_volumes.rb_node;
- while ((parent = *pp)) {
- vi = rb_entry(parent, struct afs_vol_interest, srv_node);
- if (vi->vid < new_vi->vid) {
- pp = &(*pp)->rb_left;
- } else if (vi->vid > new_vi->vid) {
- pp = &(*pp)->rb_right;
- } else {
- vi->usage++;
- goto found_vi;
- }
- }
-
- vi = new_vi;
- new_vi = NULL;
- rb_link_node_rcu(&vi->srv_node, parent, pp);
- rb_insert_color(&vi->srv_node, &server->cb_volumes);
-
-found_vi:
- new->vol_interest = vi;
- hlist_add_head(&new->cb_vlink, &vi->cb_interests);
-
- write_sequnlock(&server->cb_break_lock);
- kfree(new_vi);
- return new;
-}
-
-/*
- * Set up an interest-in-callbacks record for a volume on a server and
- * register it with the server.
- * - Called with vnode->io_lock held.
- */
-int afs_register_server_cb_interest(struct afs_vnode *vnode,
- struct afs_server_list *slist,
- unsigned int index)
-{
- struct afs_server_entry *entry = &slist->servers[index];
- struct afs_cb_interest *cbi, *vcbi, *new, *old;
- struct afs_server *server = entry->server;
-
-again:
- vcbi = rcu_dereference_protected(vnode->cb_interest,
- lockdep_is_held(&vnode->io_lock));
- if (vcbi && likely(vcbi == entry->cb_interest))
- return 0;
-
- read_lock(&slist->lock);
- cbi = afs_get_cb_interest(entry->cb_interest);
- read_unlock(&slist->lock);
-
- if (vcbi) {
- if (vcbi == cbi) {
- afs_put_cb_interest(afs_v2net(vnode), cbi);
- return 0;
- }
-
- /* Use a new interest in the server list for the same server
- * rather than an old one that's still attached to a vnode.
- */
- if (cbi && vcbi->server == cbi->server) {
- write_seqlock(&vnode->cb_lock);
- old = rcu_dereference_protected(vnode->cb_interest,
- lockdep_is_held(&vnode->cb_lock.lock));
- rcu_assign_pointer(vnode->cb_interest, cbi);
- write_sequnlock(&vnode->cb_lock);
- afs_put_cb_interest(afs_v2net(vnode), old);
- return 0;
- }
-
- /* Re-use the one attached to the vnode. */
- if (!cbi && vcbi->server == server) {
- write_lock(&slist->lock);
- if (entry->cb_interest) {
- write_unlock(&slist->lock);
- afs_put_cb_interest(afs_v2net(vnode), cbi);
- goto again;
- }
-
- entry->cb_interest = cbi;
- write_unlock(&slist->lock);
- return 0;
- }
- }
-
- if (!cbi) {
- new = afs_create_interest(server, vnode);
- if (!new)
- return -ENOMEM;
-
- write_lock(&slist->lock);
- if (!entry->cb_interest) {
- entry->cb_interest = afs_get_cb_interest(new);
- cbi = new;
- new = NULL;
- } else {
- cbi = afs_get_cb_interest(entry->cb_interest);
- }
- write_unlock(&slist->lock);
- afs_put_cb_interest(afs_v2net(vnode), new);
- }
-
- ASSERT(cbi);
-
- /* Change the server the vnode is using. This entails scrubbing any
- * interest the vnode had in the previous server it was using.
- */
- write_seqlock(&vnode->cb_lock);
-
- old = rcu_dereference_protected(vnode->cb_interest,
- lockdep_is_held(&vnode->cb_lock.lock));
- rcu_assign_pointer(vnode->cb_interest, cbi);
- vnode->cb_s_break = cbi->server->cb_s_break;
- vnode->cb_v_break = vnode->volume->cb_v_break;
- clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
-
- write_sequnlock(&vnode->cb_lock);
- afs_put_cb_interest(afs_v2net(vnode), old);
- return 0;
-}
-
-/*
- * Remove an interest on a server.
- */
-void afs_put_cb_interest(struct afs_net *net, struct afs_cb_interest *cbi)
-{
- struct afs_vol_interest *vi;
-
- if (cbi && refcount_dec_and_test(&cbi->usage)) {
- if (!hlist_unhashed(&cbi->cb_vlink)) {
- write_seqlock(&cbi->server->cb_break_lock);
-
- hlist_del_init(&cbi->cb_vlink);
- vi = cbi->vol_interest;
- cbi->vol_interest = NULL;
- if (--vi->usage == 0)
- rb_erase(&vi->srv_node, &cbi->server->cb_volumes);
- else
- vi = NULL;
-
- write_sequnlock(&cbi->server->cb_break_lock);
- if (vi)
- kfree_rcu(vi, rcu);
- afs_put_server(net, cbi->server, afs_server_trace_put_cbi);
- }
- kfree_rcu(cbi, rcu);
- }
-}
-
-/*
* allow the fileserver to request callback state (re-)initialisation
*/
void afs_init_callback_state(struct afs_server *server)
@@ -236,12 +57,12 @@ void afs_break_callback(struct afs_vnode *vnode, enum afs_cb_break_reason reason
}
/*
- * Look up a volume interest by volume ID under RCU conditions.
+ * Look up a volume by volume ID under RCU conditions.
*/
-static struct afs_vol_interest *afs_lookup_vol_interest_rcu(struct afs_server *server,
- afs_volid_t vid)
+static struct afs_volume *afs_lookup_volume_rcu(struct afs_cell *cell,
+ afs_volid_t vid)
{
- struct afs_vol_interest *vi = NULL;
+ struct afs_volume *volume = NULL;
struct rb_node *p;
int seq = 0;
@@ -250,28 +71,25 @@ static struct afs_vol_interest *afs_lookup_vol_interest_rcu(struct afs_server *s
* under just the RCU read lock, so we have to check for
* changes.
*/
- read_seqbegin_or_lock(&server->cb_break_lock, &seq);
+ read_seqbegin_or_lock(&cell->volume_lock, &seq);
- p = rcu_dereference_raw(server->cb_volumes.rb_node);
+ p = rcu_dereference_raw(cell->volumes.rb_node);
while (p) {
- vi = rb_entry(p, struct afs_vol_interest, srv_node);
+ volume = rb_entry(p, struct afs_volume, cell_node);
- if (vi->vid < vid)
+ if (volume->vid < vid)
p = rcu_dereference_raw(p->rb_left);
- else if (vi->vid > vid)
+ else if (volume->vid > vid)
p = rcu_dereference_raw(p->rb_right);
else
break;
- /* We want to repeat the search, this time with the
- * lock properly locked.
- */
- vi = NULL;
+ volume = NULL;
}
- } while (need_seqretry(&server->cb_break_lock, seq));
+ } while (need_seqretry(&cell->volume_lock, seq));
- done_seqretry(&server->cb_break_lock, seq);
- return vi;
+ done_seqretry(&cell->volume_lock, seq);
+ return volume;
}
/*
@@ -280,42 +98,37 @@ static struct afs_vol_interest *afs_lookup_vol_interest_rcu(struct afs_server *s
* - the backing file is changed
* - a lock is released
*/
-static void afs_break_one_callback(struct afs_server *server,
- struct afs_fid *fid,
- struct afs_vol_interest *vi)
+static void afs_break_one_callback(struct afs_volume *volume,
+ struct afs_fid *fid)
{
- struct afs_cb_interest *cbi;
+ struct super_block *sb;
struct afs_vnode *vnode;
struct inode *inode;
- /* Step through all interested superblocks. There may be more than one
- * because of cell aliasing.
- */
- hlist_for_each_entry_rcu(cbi, &vi->cb_interests, cb_vlink) {
- if (fid->vnode == 0 && fid->unique == 0) {
- /* The callback break applies to an entire volume. */
- struct afs_super_info *as = AFS_FS_S(cbi->sb);
- struct afs_volume *volume = as->volume;
+ if (fid->vnode == 0 && fid->unique == 0) {
+ /* The callback break applies to an entire volume. */
+ write_lock(&volume->cb_v_break_lock);
+ volume->cb_v_break++;
+ trace_afs_cb_break(fid, volume->cb_v_break,
+ afs_cb_break_for_volume_callback, false);
+ write_unlock(&volume->cb_v_break_lock);
+ return;
+ }
- write_lock(&volume->cb_v_break_lock);
- volume->cb_v_break++;
- trace_afs_cb_break(fid, volume->cb_v_break,
- afs_cb_break_for_volume_callback, false);
- write_unlock(&volume->cb_v_break_lock);
- } else {
- /* See if we can find a matching inode - even an I_NEW
- * inode needs to be marked as it can have its callback
- * broken before we finish setting up the local inode.
- */
- inode = find_inode_rcu(cbi->sb, fid->vnode,
- afs_ilookup5_test_by_fid, fid);
- if (inode) {
- vnode = AFS_FS_I(inode);
- afs_break_callback(vnode, afs_cb_break_for_callback);
- } else {
- trace_afs_cb_miss(fid, afs_cb_break_for_callback);
- }
- }
+ /* See if we can find a matching inode - even an I_NEW inode needs to
+ * be marked as it can have its callback broken before we finish
+ * setting up the local inode.
+ */
+ sb = rcu_dereference(volume->sb);
+ if (!sb)
+ return;
+
+ inode = find_inode_rcu(sb, fid->vnode, afs_ilookup5_test_by_fid, fid);
+ if (inode) {
+ vnode = AFS_FS_I(inode);
+ afs_break_callback(vnode, afs_cb_break_for_callback);
+ } else {
+ trace_afs_cb_miss(fid, afs_cb_break_for_callback);
}
}
@@ -324,11 +137,11 @@ static void afs_break_some_callbacks(struct afs_server *server,
size_t *_count)
{
struct afs_callback_break *residue = cbb;
- struct afs_vol_interest *vi;
+ struct afs_volume *volume;
afs_volid_t vid = cbb->fid.vid;
size_t i;
- vi = afs_lookup_vol_interest_rcu(server, vid);
+ volume = afs_lookup_volume_rcu(server->cell, vid);
/* TODO: Find all matching volumes if we couldn't match the server and
* break them anyway.
@@ -341,8 +154,8 @@ static void afs_break_some_callbacks(struct afs_server *server,
cbb->fid.vnode,
cbb->fid.unique);
--*_count;
- if (vi)
- afs_break_one_callback(server, &cbb->fid, vi);
+ if (volume)
+ afs_break_one_callback(volume, &cbb->fid);
} else {
*residue++ = *cbb;
}
@@ -367,16 +180,3 @@ void afs_break_callbacks(struct afs_server *server, size_t count,
rcu_read_unlock();
return;
}
-
-/*
- * Clear the callback interests in a server list.
- */
-void afs_clear_callback_interests(struct afs_net *net, struct afs_server_list *slist)
-{
- int i;
-
- for (i = 0; i < slist->nr_servers; i++) {
- afs_put_cb_interest(net, slist->servers[i].cb_interest);
- slist->servers[i].cb_interest = NULL;
- }
-}