diff options
Diffstat (limited to 'fs/afs')
| -rw-r--r-- | fs/afs/callback.c | 110 | ||||
| -rw-r--r-- | fs/afs/internal.h | 15 | ||||
| -rw-r--r-- | fs/afs/server.c | 2 |
3 files changed, 107 insertions, 20 deletions
diff --git a/fs/afs/callback.c b/fs/afs/callback.c index 571437dcb252..5f261fbf2182 100644 --- a/fs/afs/callback.c +++ b/fs/afs/callback.c @@ -21,6 +21,66 @@ #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 hlist_node **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_NODE(&new_vi->srv_link); + INIT_HLIST_HEAD(&new_vi->cb_interests); + + refcount_set(&new->usage, 1); + new->sb = vnode->vfs_inode.i_sb; + new->vid = vnode->volume->vid; + new->server = afs_get_server(server); + INIT_HLIST_NODE(&new->cb_vlink); + + write_lock(&server->cb_break_lock); + + for (pp = &server->cb_volumes.first; *pp; pp = &(*pp)->next) { + vi = hlist_entry(*pp, struct afs_vol_interest, srv_link); + if (vi->vid < new_vi->vid) + continue; + if (vi->vid > new_vi->vid) + break; + vi->usage++; + goto found_vi; + } + + new_vi->srv_link.pprev = pp; + new_vi->srv_link.next = *pp; + if (*pp) + (*pp)->pprev = &new_vi->srv_link.next; + *pp = &new_vi->srv_link; + vi = new_vi; + new_vi = NULL; +found_vi: + + new->vol_interest = vi; + hlist_add_head(&new->cb_vlink, &vi->cb_interests); + + write_unlock(&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. @@ -77,20 +137,10 @@ again: } if (!cbi) { - new = kzalloc(sizeof(struct afs_cb_interest), GFP_KERNEL); + new = afs_create_interest(server, vnode); if (!new) return -ENOMEM; - refcount_set(&new->usage, 1); - new->sb = vnode->vfs_inode.i_sb; - new->vid = vnode->volume->vid; - new->server = afs_get_server(server); - INIT_LIST_HEAD(&new->cb_link); - - write_lock(&server->cb_break_lock); - list_add_tail(&new->cb_link, &server->cb_interests); - write_unlock(&server->cb_break_lock); - write_lock(&slist->lock); if (!entry->cb_interest) { entry->cb_interest = afs_get_cb_interest(new); @@ -126,11 +176,22 @@ again: */ 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 (!list_empty(&cbi->cb_link)) { + if (!hlist_unhashed(&cbi->cb_vlink)) { write_lock(&cbi->server->cb_break_lock); - list_del_init(&cbi->cb_link); + + hlist_del_init(&cbi->cb_vlink); + vi = cbi->vol_interest; + cbi->vol_interest = NULL; + if (--vi->usage == 0) + hlist_del(&vi->srv_link); + else + vi = NULL; + write_unlock(&cbi->server->cb_break_lock); + kfree(vi); afs_put_server(net, cbi->server); } kfree(cbi); @@ -182,20 +243,34 @@ void afs_break_callback(struct afs_vnode *vnode) static void afs_break_one_callback(struct afs_server *server, struct afs_fid *fid) { + struct afs_vol_interest *vi; struct afs_cb_interest *cbi; struct afs_iget_data data; struct afs_vnode *vnode; struct inode *inode; read_lock(&server->cb_break_lock); + hlist_for_each_entry(vi, &server->cb_volumes, srv_link) { + if (vi->vid < fid->vid) + continue; + if (vi->vid > fid->vid) { + vi = NULL; + break; + } + //atomic_inc(&vi->usage); + break; + } + + /* TODO: Find all matching volumes if we couldn't match the server and + * break them anyway. + */ + if (!vi) + goto out; /* Step through all interested superblocks. There may be more than one * because of cell aliasing. */ - list_for_each_entry(cbi, &server->cb_interests, cb_link) { - if (cbi->vid != fid->vid) - continue; - + hlist_for_each_entry(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); @@ -217,6 +292,7 @@ static void afs_break_one_callback(struct afs_server *server, } } +out: read_unlock(&server->cb_break_lock); } diff --git a/fs/afs/internal.h b/fs/afs/internal.h index 5d8260b4c2b3..9778df135717 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -407,16 +407,27 @@ struct afs_server { rwlock_t fs_lock; /* access lock */ /* callback promise management */ - struct list_head cb_interests; /* List of superblocks using this server */ + struct hlist_head cb_volumes; /* List of volume interests on this server */ unsigned cb_s_break; /* Break-everything counter. */ rwlock_t cb_break_lock; /* Volume finding lock */ }; /* + * Volume collation in the server's callback interest list. + */ +struct afs_vol_interest { + struct hlist_node srv_link; /* Link in server->cb_volumes */ + struct hlist_head cb_interests; /* List of callback interests on the server */ + afs_volid_t vid; /* Volume ID to match */ + unsigned int usage; +}; + +/* * Interest by a superblock on a server. */ struct afs_cb_interest { - struct list_head cb_link; /* Link in server->cb_interests */ + struct hlist_node cb_vlink; /* Link in vol_interest->cb_interests */ + struct afs_vol_interest *vol_interest; struct afs_server *server; /* Server on which this interest resides */ struct super_block *sb; /* Superblock on which inodes reside */ afs_volid_t vid; /* Volume ID to match */ diff --git a/fs/afs/server.c b/fs/afs/server.c index 3af4625e2f8c..1d329e6981d5 100644 --- a/fs/afs/server.c +++ b/fs/afs/server.c @@ -228,7 +228,7 @@ static struct afs_server *afs_alloc_server(struct afs_net *net, server->flags = (1UL << AFS_SERVER_FL_NEW); server->update_at = ktime_get_real_seconds() + afs_server_update_delay; rwlock_init(&server->fs_lock); - INIT_LIST_HEAD(&server->cb_interests); + INIT_HLIST_HEAD(&server->cb_volumes); rwlock_init(&server->cb_break_lock); afs_inc_servers_outstanding(net); |