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afs: Fix application of the results of a inline bulk status fetch 

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: 5cf9dd55a0 ("afs: Prospectively look up extra files when doing a single lookup")
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2019-05-14 12:33:10 +01:00
parent b835915325
commit 39db9815da
2 changed files with 45 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/afs/afs.h
View File

@ -150,6 +150,7 @@ 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 */

51
fs/afs/dir.c
View File

@ -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 @@ no_inline_bulk_status:
* 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 @@ no_inline_bulk_status:
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 @@ success:
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 @@ success:
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);