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Subject[PATCH 12/12] afs: Fix application of the results of a inline bulk status fetch
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Fix afs_do_lookup() such that when it does an inline bulk status fetch op,
it will update inodes that are already extant (something that afs_iget()
doesn't do) and to cache permits for each inode created (thereby avoiding a
follow up FS.FetchStatus call to determine this).

Extant inodes need looking up in advance so that their cb_break counters
before and after the operation can be compared. To this end, the inode
pointers are cached so that they don't need looking up again after the op.

Fixes: 5cf9dd55a0ec ("afs: Prospectively look up extra files when doing a single lookup")
Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/afs/afs.h | 1 +
fs/afs/dir.c | 51 ++++++++++++++++++++++++++++++++++++++++++++-------
2 files changed, 45 insertions(+), 7 deletions(-)

diff --git a/fs/afs/afs.h b/fs/afs/afs.h
index 4d41c8966c59..27911a57db4f 100644
--- a/fs/afs/afs.h
+++ b/fs/afs/afs.h
@@ -147,6 +147,7 @@ struct afs_file_status {
struct afs_status_cb {
struct afs_file_status status;
struct afs_callback callback;
+ unsigned int cb_break; /* Pre-op callback break counter */
bool have_status; /* True if status record was retrieved */
bool have_cb; /* True if cb record was retrieved */
bool have_error; /* True if status.abort_code indicates an error */
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 9e42f6c75747..79d93a26759a 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -103,6 +103,7 @@ struct afs_lookup_cookie {
bool found;
bool one_only;
unsigned short nr_fids;
+ struct inode **inodes;
struct afs_status_cb *statuses;
struct afs_fid fids[50];
};
@@ -644,8 +645,8 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
struct afs_iget_data iget_data;
struct afs_fs_cursor fc;
struct afs_server *server;
- struct afs_vnode *dvnode = AFS_FS_I(dir);
- struct inode *inode = NULL;
+ struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
+ struct inode *inode = NULL, *ti;
int ret, i;

_enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
@@ -700,6 +701,27 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
if (!cookie->statuses)
goto out;

+ cookie->inodes = kcalloc(cookie->nr_fids, sizeof(struct inode *),
+ GFP_KERNEL);
+ if (!cookie->inodes)
+ goto out_s;
+
+ for (i = 1; i < cookie->nr_fids; i++) {
+ scb = &cookie->statuses[i];
+
+ /* Find any inodes that already exist and get their
+ * callback counters.
+ */
+ iget_data.fid = cookie->fids[i];
+ ti = ilookup5_nowait(dir->i_sb, iget_data.fid.vnode,
+ afs_iget5_test, &iget_data);
+ if (!IS_ERR_OR_NULL(ti)) {
+ vnode = AFS_FS_I(ti);
+ scb->cb_break = afs_calc_vnode_cb_break(vnode);
+ cookie->inodes[i] = ti;
+ }
+ }
+
/* Try FS.InlineBulkStatus first. Abort codes for the individual
* lookups contained therein are stored in the reply without aborting
* the whole operation.
@@ -742,7 +764,6 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
* any of the lookups fails - so, for the moment, revert to
* FS.FetchStatus for just the primary fid.
*/
- cookie->nr_fids = 1;
inode = ERR_PTR(-ERESTARTSYS);
if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
while (afs_select_fileserver(&fc)) {
@@ -764,9 +785,6 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
if (IS_ERR(inode))
goto out_c;

- for (i = 0; i < cookie->nr_fids; i++)
- cookie->statuses[i].status.abort_code = 0;
-
success:
/* Turn all the files into inodes and save the first one - which is the
* one we actually want.
@@ -777,13 +795,26 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,

for (i = 0; i < cookie->nr_fids; i++) {
struct afs_status_cb *scb = &cookie->statuses[i];
- struct inode *ti;
+
+ if (!scb->have_status && !scb->have_error)
+ continue;
+
+ if (cookie->inodes[i]) {
+ afs_vnode_commit_status(&fc, AFS_FS_I(cookie->inodes[i]),
+ scb->cb_break, NULL, scb);
+ continue;
+ }

if (scb->status.abort_code != 0)
continue;

iget_data.fid = cookie->fids[i];
ti = afs_iget(dir->i_sb, key, &iget_data, scb, cbi, dvnode);
+ if (!IS_ERR(ti))
+ afs_cache_permit(AFS_FS_I(ti), key,
+ 0 /* Assume vnode->cb_break is 0 */ +
+ iget_data.cb_v_break,
+ scb);
if (i == 0) {
inode = ti;
} else {
@@ -794,6 +825,12 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,

out_c:
afs_put_cb_interest(afs_v2net(dvnode), cbi);
+ if (cookie->inodes) {
+ for (i = 0; i < cookie->nr_fids; i++)
+ iput(cookie->inodes[i]);
+ kfree(cookie->inodes);
+ }
+out_s:
kvfree(cookie->statuses);
out:
kfree(cookie);
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