Merge branch 'stable/for-jens-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip into for-linus

Konrad writes:

Please git pull the following branch:

 git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git stable/for-jens-3.14

which is based off v3.13-rc6. If you would like me to rebase it on
a different branch/tag I would be more than happy to do so.

The patches are all bug-fixes and hopefully can go in 3.14.

They deal with xen-blkback shutdown and cause memory leaks
as well as shutdown races. They should go to stable tree and if you
are OK with I will ask them to backport those fixes.

There is also a fix to xen-blkfront to deal with unexpected state
transition. And lastly a fix to the header where it was using the
__aligned__ unnecessarily.
This commit is contained in:
Jens Axboe 2014-02-10 12:52:34 -07:00
Родитель 11c9444407 3661371701
Коммит 9d4cb8e3a5
5 изменённых файлов: 80 добавлений и 47 удалений

Просмотреть файл

@ -375,7 +375,7 @@ static void purge_persistent_gnt(struct xen_blkif *blkif)
pr_debug(DRV_PFX "Going to purge %u persistent grants\n", num_clean);
INIT_LIST_HEAD(&blkif->persistent_purge_list);
BUG_ON(!list_empty(&blkif->persistent_purge_list));
root = &blkif->persistent_gnts;
purge_list:
foreach_grant_safe(persistent_gnt, n, root, node) {
@ -625,16 +625,8 @@ purge_gnt_list:
print_stats(blkif);
}
/* Since we are shutting down remove all pages from the buffer */
shrink_free_pagepool(blkif, 0 /* All */);
/* Free all persistent grant pages */
if (!RB_EMPTY_ROOT(&blkif->persistent_gnts))
free_persistent_gnts(blkif, &blkif->persistent_gnts,
blkif->persistent_gnt_c);
BUG_ON(!RB_EMPTY_ROOT(&blkif->persistent_gnts));
blkif->persistent_gnt_c = 0;
/* Drain pending purge work */
flush_work(&blkif->persistent_purge_work);
if (log_stats)
print_stats(blkif);
@ -645,6 +637,23 @@ purge_gnt_list:
return 0;
}
/*
* Remove persistent grants and empty the pool of free pages
*/
void xen_blkbk_free_caches(struct xen_blkif *blkif)
{
/* Free all persistent grant pages */
if (!RB_EMPTY_ROOT(&blkif->persistent_gnts))
free_persistent_gnts(blkif, &blkif->persistent_gnts,
blkif->persistent_gnt_c);
BUG_ON(!RB_EMPTY_ROOT(&blkif->persistent_gnts));
blkif->persistent_gnt_c = 0;
/* Since we are shutting down remove all pages from the buffer */
shrink_free_pagepool(blkif, 0 /* All */);
}
/*
* Unmap the grant references, and also remove the M2P over-rides
* used in the 'pending_req'.
@ -838,7 +847,7 @@ static int xen_blkbk_parse_indirect(struct blkif_request *req,
struct grant_page **pages = pending_req->indirect_pages;
struct xen_blkif *blkif = pending_req->blkif;
int indirect_grefs, rc, n, nseg, i;
struct blkif_request_segment_aligned *segments = NULL;
struct blkif_request_segment *segments = NULL;
nseg = pending_req->nr_pages;
indirect_grefs = INDIRECT_PAGES(nseg);
@ -934,9 +943,7 @@ static void xen_blk_drain_io(struct xen_blkif *blkif)
{
atomic_set(&blkif->drain, 1);
do {
/* The initial value is one, and one refcnt taken at the
* start of the xen_blkif_schedule thread. */
if (atomic_read(&blkif->refcnt) <= 2)
if (atomic_read(&blkif->inflight) == 0)
break;
wait_for_completion_interruptible_timeout(
&blkif->drain_complete, HZ);
@ -976,17 +983,30 @@ static void __end_block_io_op(struct pending_req *pending_req, int error)
* the proper response on the ring.
*/
if (atomic_dec_and_test(&pending_req->pendcnt)) {
xen_blkbk_unmap(pending_req->blkif,
struct xen_blkif *blkif = pending_req->blkif;
xen_blkbk_unmap(blkif,
pending_req->segments,
pending_req->nr_pages);
make_response(pending_req->blkif, pending_req->id,
make_response(blkif, pending_req->id,
pending_req->operation, pending_req->status);
xen_blkif_put(pending_req->blkif);
if (atomic_read(&pending_req->blkif->refcnt) <= 2) {
if (atomic_read(&pending_req->blkif->drain))
complete(&pending_req->blkif->drain_complete);
free_req(blkif, pending_req);
/*
* Make sure the request is freed before releasing blkif,
* or there could be a race between free_req and the
* cleanup done in xen_blkif_free during shutdown.
*
* NB: The fact that we might try to wake up pending_free_wq
* before drain_complete (in case there's a drain going on)
* it's not a problem with our current implementation
* because we can assure there's no thread waiting on
* pending_free_wq if there's a drain going on, but it has
* to be taken into account if the current model is changed.
*/
if (atomic_dec_and_test(&blkif->inflight) && atomic_read(&blkif->drain)) {
complete(&blkif->drain_complete);
}
free_req(pending_req->blkif, pending_req);
xen_blkif_put(blkif);
}
}
@ -1240,6 +1260,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
* below (in "!bio") if we are handling a BLKIF_OP_DISCARD.
*/
xen_blkif_get(blkif);
atomic_inc(&blkif->inflight);
for (i = 0; i < nseg; i++) {
while ((bio == NULL) ||

Просмотреть файл

@ -57,7 +57,7 @@
#define MAX_INDIRECT_SEGMENTS 256
#define SEGS_PER_INDIRECT_FRAME \
(PAGE_SIZE/sizeof(struct blkif_request_segment_aligned))
(PAGE_SIZE/sizeof(struct blkif_request_segment))
#define MAX_INDIRECT_PAGES \
((MAX_INDIRECT_SEGMENTS + SEGS_PER_INDIRECT_FRAME - 1)/SEGS_PER_INDIRECT_FRAME)
#define INDIRECT_PAGES(_segs) \
@ -278,6 +278,7 @@ struct xen_blkif {
/* for barrier (drain) requests */
struct completion drain_complete;
atomic_t drain;
atomic_t inflight;
/* One thread per one blkif. */
struct task_struct *xenblkd;
unsigned int waiting_reqs;
@ -376,6 +377,7 @@ int xen_blkif_xenbus_init(void);
irqreturn_t xen_blkif_be_int(int irq, void *dev_id);
int xen_blkif_schedule(void *arg);
int xen_blkif_purge_persistent(void *arg);
void xen_blkbk_free_caches(struct xen_blkif *blkif);
int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt,
struct backend_info *be, int state);

Просмотреть файл

@ -125,8 +125,10 @@ static struct xen_blkif *xen_blkif_alloc(domid_t domid)
blkif->persistent_gnts.rb_node = NULL;
spin_lock_init(&blkif->free_pages_lock);
INIT_LIST_HEAD(&blkif->free_pages);
INIT_LIST_HEAD(&blkif->persistent_purge_list);
blkif->free_pages_num = 0;
atomic_set(&blkif->persistent_gnt_in_use, 0);
atomic_set(&blkif->inflight, 0);
INIT_LIST_HEAD(&blkif->pending_free);
@ -259,6 +261,17 @@ static void xen_blkif_free(struct xen_blkif *blkif)
if (!atomic_dec_and_test(&blkif->refcnt))
BUG();
/* Remove all persistent grants and the cache of ballooned pages. */
xen_blkbk_free_caches(blkif);
/* Make sure everything is drained before shutting down */
BUG_ON(blkif->persistent_gnt_c != 0);
BUG_ON(atomic_read(&blkif->persistent_gnt_in_use) != 0);
BUG_ON(blkif->free_pages_num != 0);
BUG_ON(!list_empty(&blkif->persistent_purge_list));
BUG_ON(!list_empty(&blkif->free_pages));
BUG_ON(!RB_EMPTY_ROOT(&blkif->persistent_gnts));
/* Check that there is no request in use */
list_for_each_entry_safe(req, n, &blkif->pending_free, free_list) {
list_del(&req->free_list);

Просмотреть файл

@ -162,7 +162,7 @@ static DEFINE_SPINLOCK(minor_lock);
#define DEV_NAME "xvd" /* name in /dev */
#define SEGS_PER_INDIRECT_FRAME \
(PAGE_SIZE/sizeof(struct blkif_request_segment_aligned))
(PAGE_SIZE/sizeof(struct blkif_request_segment))
#define INDIRECT_GREFS(_segs) \
((_segs + SEGS_PER_INDIRECT_FRAME - 1)/SEGS_PER_INDIRECT_FRAME)
@ -393,7 +393,7 @@ static int blkif_queue_request(struct request *req)
unsigned long id;
unsigned int fsect, lsect;
int i, ref, n;
struct blkif_request_segment_aligned *segments = NULL;
struct blkif_request_segment *segments = NULL;
/*
* Used to store if we are able to queue the request by just using
@ -550,7 +550,7 @@ static int blkif_queue_request(struct request *req)
} else {
n = i % SEGS_PER_INDIRECT_FRAME;
segments[n] =
(struct blkif_request_segment_aligned) {
(struct blkif_request_segment) {
.gref = ref,
.first_sect = fsect,
.last_sect = lsect };
@ -1904,13 +1904,16 @@ static void blkback_changed(struct xenbus_device *dev,
case XenbusStateReconfiguring:
case XenbusStateReconfigured:
case XenbusStateUnknown:
case XenbusStateClosed:
break;
case XenbusStateConnected:
blkfront_connect(info);
break;
case XenbusStateClosed:
if (dev->state == XenbusStateClosed)
break;
/* Missed the backend's Closing state -- fallthrough */
case XenbusStateClosing:
blkfront_closing(info);
break;

Просмотреть файл

@ -113,13 +113,13 @@ typedef uint64_t blkif_sector_t;
* it's less than the number provided by the backend. The indirect_grefs field
* in blkif_request_indirect should be filled by the frontend with the
* grant references of the pages that are holding the indirect segments.
* This pages are filled with an array of blkif_request_segment_aligned
* that hold the information about the segments. The number of indirect
* pages to use is determined by the maximum number of segments
* a indirect request contains. Every indirect page can contain a maximum
* of 512 segments (PAGE_SIZE/sizeof(blkif_request_segment_aligned)),
* so to calculate the number of indirect pages to use we have to do
* ceil(indirect_segments/512).
* These pages are filled with an array of blkif_request_segment that hold the
* information about the segments. The number of indirect pages to use is
* determined by the number of segments an indirect request contains. Every
* indirect page can contain a maximum of
* (PAGE_SIZE / sizeof(struct blkif_request_segment)) segments, so to
* calculate the number of indirect pages to use we have to do
* ceil(indirect_segments / (PAGE_SIZE / sizeof(struct blkif_request_segment))).
*
* If a backend does not recognize BLKIF_OP_INDIRECT, it should *not*
* create the "feature-max-indirect-segments" node!
@ -135,13 +135,12 @@ typedef uint64_t blkif_sector_t;
#define BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST 8
struct blkif_request_segment_aligned {
grant_ref_t gref; /* reference to I/O buffer frame */
/* @first_sect: first sector in frame to transfer (inclusive). */
/* @last_sect: last sector in frame to transfer (inclusive). */
uint8_t first_sect, last_sect;
uint16_t _pad; /* padding to make it 8 bytes, so it's cache-aligned */
} __attribute__((__packed__));
struct blkif_request_segment {
grant_ref_t gref; /* reference to I/O buffer frame */
/* @first_sect: first sector in frame to transfer (inclusive). */
/* @last_sect: last sector in frame to transfer (inclusive). */
uint8_t first_sect, last_sect;
};
struct blkif_request_rw {
uint8_t nr_segments; /* number of segments */
@ -151,12 +150,7 @@ struct blkif_request_rw {
#endif
uint64_t id; /* private guest value, echoed in resp */
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
struct blkif_request_segment {
grant_ref_t gref; /* reference to I/O buffer frame */
/* @first_sect: first sector in frame to transfer (inclusive). */
/* @last_sect: last sector in frame to transfer (inclusive). */
uint8_t first_sect, last_sect;
} seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
} __attribute__((__packed__));
struct blkif_request_discard {