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afs: Locally edit directory data for mkdir/create/unlink/...

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Locally edit the contents of an AFS directory upon a successful inode
operation that modifies that directory (such as mkdir, create and unlink)
so that we can avoid the current practice of re-downloading the directory
after each change.

This is viable provided that the directory version number we get back from
the modifying RPC op is exactly incremented by 1 from what we had
previously.  The data in the directory contents is in a defined format that
we have to parse locally to perform lookups and readdir, so modifying isn't
a problem.

If the edit fails, we just clear the VALID flag on the directory and it
will be reloaded next time it is needed.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2018-04-06 14:17:25 +01:00
parent 0031763698
commit 63a4681ff3
8 changed files with 715 additions and 29 deletions
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7
fs/afs/inode.c
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@@ -395,8 +395,11 @@ int afs_validate(struct afs_vnode *vnode, struct key *key)
if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
if (vnode->cb_s_break != vnode->cb_interest->server->cb_s_break) {
vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
} else if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags) &&
!test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) &&
} else if (vnode->status.type == AFS_FTYPE_DIR &&
test_bit(AFS_VNODE_DIR_VALID, &vnode->flags) &&
vnode->cb_expires_at - 10 > now) {
valid = true;
} else if (!test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) &&
vnode->cb_expires_at - 10 > now) {
valid = true;
}