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authorDavid Howells <dhowells@redhat.com>2018-05-12 22:31:33 +0100
committerDavid Howells <dhowells@redhat.com>2018-05-14 15:15:18 +0100
commit68251f0a6818f3be19b1471f36c956ca97c1427d (patch)
tree1e4fb0cacb40aff37e9f0177a772c6509631afec /fs/afs/callback.c
parentf9c1bba3d392843f046d2ee27b4dfcec989d8a4b (diff)
downloadlinux-68251f0a6818f3be19b1471f36c956ca97c1427d.tar.bz2
afs: Fix whole-volume callback handling
It's possible for an AFS file server to issue a whole-volume notification that callbacks on all the vnodes in the file have been broken. This is done for R/O and backup volumes (which don't have per-file callbacks) and for things like a volume being taken offline. Fix callback handling to detect whole-volume notifications, to track it across operations and to check it during inode validation. Fixes: c435ee34551e ("afs: Overhaul the callback handling") Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs/callback.c')
-rw-r--r--fs/afs/callback.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/fs/afs/callback.c b/fs/afs/callback.c
index 09332945d322..571437dcb252 100644
--- a/fs/afs/callback.c
+++ b/fs/afs/callback.c
@@ -113,6 +113,7 @@ again:
old = vnode->cb_interest;
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);
@@ -195,13 +196,24 @@ static void afs_break_one_callback(struct afs_server *server,
if (cbi->vid != fid->vid)
continue;
- data.volume = NULL;
- data.fid = *fid;
- inode = ilookup5_nowait(cbi->sb, fid->vnode, afs_iget5_test, &data);
- if (inode) {
- vnode = AFS_FS_I(inode);
- afs_break_callback(vnode);
- iput(inode);
+ 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;
+
+ write_lock(&volume->cb_break_lock);
+ volume->cb_v_break++;
+ write_unlock(&volume->cb_break_lock);
+ } else {
+ data.volume = NULL;
+ data.fid = *fid;
+ inode = ilookup5_nowait(cbi->sb, fid->vnode,
+ afs_iget5_test, &data);
+ if (inode) {
+ vnode = AFS_FS_I(inode);
+ afs_break_callback(vnode);
+ iput(inode);
+ }
}
}
@@ -219,6 +231,8 @@ void afs_break_callbacks(struct afs_server *server, size_t count,
ASSERT(server != NULL);
ASSERTCMP(count, <=, AFSCBMAX);
+ /* TODO: Sort the callback break list by volume ID */
+
for (; count > 0; callbacks++, count--) {
_debug("- Fid { vl=%08x n=%u u=%u } CB { v=%u x=%u t=%u }",
callbacks->fid.vid,