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afs: Make record checking use TASK_UNINTERRUPTIBLE when appropriate 

When an operation is meant to be done uninterruptibly (such as
FS.StoreData), we should not be allowing volume and server record checking
to be interrupted.

Fixes: d2ddc776a4 ("afs: Overhaul volume and server record caching and fileserver rotation")
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2020-04-16 18:17:13 +01:00
parent 69cf3978f3
commit c4bfda16d1
4 changed files with 11 additions and 12 deletions
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2
fs/afs/internal.h
View File

@ -1333,7 +1333,7 @@ extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
extern void afs_activate_volume(struct afs_volume *);
extern void afs_deactivate_volume(struct afs_volume *);
extern void afs_put_volume(struct afs_cell *, struct afs_volume *);
extern int afs_check_volume_status(struct afs_volume *, struct key *);
extern int afs_check_volume_status(struct afs_volume *, struct afs_fs_cursor *);
/*
* write.c

6
fs/afs/rotate.c
View File

@ -192,7 +192,7 @@ bool afs_select_fileserver(struct afs_fs_cursor *fc)
write_unlock(&vnode->volume->servers_lock);
set_bit(AFS_VOLUME_NEEDS_UPDATE, &vnode->volume->flags);
error = afs_check_volume_status(vnode->volume, fc->key);
error = afs_check_volume_status(vnode->volume, fc);
if (error < 0)
goto failed_set_error;
@ -281,7 +281,7 @@ bool afs_select_fileserver(struct afs_fs_cursor *fc)
set_bit(AFS_VOLUME_WAIT, &vnode->volume->flags);
set_bit(AFS_VOLUME_NEEDS_UPDATE, &vnode->volume->flags);
error = afs_check_volume_status(vnode->volume, fc->key);
error = afs_check_volume_status(vnode->volume, fc);
if (error < 0)
goto failed_set_error;
@ -341,7 +341,7 @@ start:
/* See if we need to do an update of the volume record. Note that the
* volume may have moved or even have been deleted.
*/
error = afs_check_volume_status(vnode->volume, fc->key);
error = afs_check_volume_status(vnode->volume, fc);
if (error < 0)
goto failed_set_error;

7
fs/afs/server.c
View File

@ -594,12 +594,9 @@ retry:
}
ret = wait_on_bit(&server->flags, AFS_SERVER_FL_UPDATING,
TASK_INTERRUPTIBLE);
(fc->flags & AFS_FS_CURSOR_INTR) ?
TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
if (ret == -ERESTARTSYS) {
if (!(fc->flags & AFS_FS_CURSOR_INTR) && server->addresses) {
_leave(" = t [intr]");
return true;
}
fc->error = ret;
_leave(" = f [intr]");
return false;

8
fs/afs/volume.c
View File

@ -281,7 +281,7 @@ error:
/*
* Make sure the volume record is up to date.
*/
int afs_check_volume_status(struct afs_volume *volume, struct key *key)
int afs_check_volume_status(struct afs_volume *volume, struct afs_fs_cursor *fc)
{
time64_t now = ktime_get_real_seconds();
int ret, retries = 0;
@ -299,7 +299,7 @@ retry:
}
if (!test_and_set_bit_lock(AFS_VOLUME_UPDATING, &volume->flags)) {
ret = afs_update_volume_status(volume, key);
ret = afs_update_volume_status(volume, fc->key);
clear_bit_unlock(AFS_VOLUME_WAIT, &volume->flags);
clear_bit_unlock(AFS_VOLUME_UPDATING, &volume->flags);
wake_up_bit(&volume->flags, AFS_VOLUME_WAIT);
@ -312,7 +312,9 @@ retry:
return 0;
}
ret = wait_on_bit(&volume->flags, AFS_VOLUME_WAIT, TASK_INTERRUPTIBLE);
ret = wait_on_bit(&volume->flags, AFS_VOLUME_WAIT,
(fc->flags & AFS_FS_CURSOR_INTR) ?
TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
if (ret == -ERESTARTSYS) {
_leave(" = %d", ret);
return ret;