#include "xfs_trace.h"
static kmem_zone_t *xfs_buf_zone;
-STATIC int xfsbufd(void *);
static struct workqueue_struct *xfslogd_workqueue;
xfs_buf_stale(
struct xfs_buf *bp)
{
+ ASSERT(xfs_buf_islocked(bp));
+
bp->b_flags |= XBF_STALE;
- xfs_buf_delwri_dequeue(bp);
+
+ /*
+ * Clear the delwri status so that a delwri queue walker will not
+ * flush this buffer to disk now that it is stale. The delwri queue has
+ * a reference to the buffer, so this is safe to do.
+ */
+ bp->b_flags &= ~_XBF_DELWRI_Q;
+
atomic_set(&(bp)->b_lru_ref, 0);
if (!list_empty(&bp->b_lru)) {
struct xfs_buftarg *btp = bp->b_target;
{
int status;
- ASSERT(!(flags & (XBF_DELWRI|XBF_WRITE)));
+ ASSERT(!(flags & XBF_WRITE));
ASSERT(bp->b_bn != XFS_BUF_DADDR_NULL);
- bp->b_flags &= ~(XBF_WRITE | XBF_ASYNC | XBF_DELWRI | XBF_READ_AHEAD);
+ bp->b_flags &= ~(XBF_WRITE | XBF_ASYNC | XBF_READ_AHEAD);
bp->b_flags |= flags & (XBF_READ | XBF_ASYNC | XBF_READ_AHEAD);
status = xfs_buf_iorequest(bp);
spin_unlock(&pag->pag_buf_lock);
} else {
xfs_buf_lru_del(bp);
- ASSERT(!(bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q)));
+ ASSERT(!(bp->b_flags & _XBF_DELWRI_Q));
rb_erase(&bp->b_rbnode, &pag->pag_buf_tree);
spin_unlock(&pag->pag_buf_lock);
xfs_perag_put(pag);
trace_xfs_buf_lock_done(bp, _RET_IP_);
}
-/*
- * Releases the lock on the buffer object.
- * If the buffer is marked delwri but is not queued, do so before we
- * unlock the buffer as we need to set flags correctly. We also need to
- * take a reference for the delwri queue because the unlocker is going to
- * drop their's and they don't know we just queued it.
- */
void
xfs_buf_unlock(
struct xfs_buf *bp)
{
int error;
+ ASSERT(xfs_buf_islocked(bp));
+
bp->b_flags |= XBF_WRITE;
- bp->b_flags &= ~(XBF_ASYNC | XBF_READ);
+ bp->b_flags &= ~(XBF_ASYNC | XBF_READ | _XBF_DELWRI_Q);
- xfs_buf_delwri_dequeue(bp);
xfs_bdstrat_cb(bp);
error = xfs_buf_iowait(bp);
{
trace_xfs_buf_iorequest(bp, _RET_IP_);
- ASSERT(!(bp->b_flags & XBF_DELWRI));
+ ASSERT(!(bp->b_flags & _XBF_DELWRI_Q));
if (bp->b_flags & XBF_WRITE)
xfs_buf_wait_unpin(bp);
{
unregister_shrinker(&btp->bt_shrinker);
- xfs_flush_buftarg(btp, 1);
if (mp->m_flags & XFS_MOUNT_BARRIER)
xfs_blkdev_issue_flush(btp);
- kthread_stop(btp->bt_task);
kmem_free(btp);
}
return xfs_setsize_buftarg_flags(btp, blocksize, sectorsize, 1);
}
-STATIC int
-xfs_alloc_delwri_queue(
- xfs_buftarg_t *btp,
- const char *fsname)
-{
- INIT_LIST_HEAD(&btp->bt_delwri_queue);
- spin_lock_init(&btp->bt_delwri_lock);
- btp->bt_flags = 0;
- btp->bt_task = kthread_run(xfsbufd, btp, "xfsbufd/%s", fsname);
- if (IS_ERR(btp->bt_task))
- return PTR_ERR(btp->bt_task);
- return 0;
-}
-
xfs_buftarg_t *
xfs_alloc_buftarg(
struct xfs_mount *mp,
spin_lock_init(&btp->bt_lru_lock);
if (xfs_setsize_buftarg_early(btp, bdev))
goto error;
- if (xfs_alloc_delwri_queue(btp, fsname))
- goto error;
btp->bt_shrinker.shrink = xfs_buftarg_shrink;
btp->bt_shrinker.seeks = DEFAULT_SEEKS;
register_shrinker(&btp->bt_shrinker);
return NULL;
}
-
/*
- * Delayed write buffer handling
+ * Add a buffer to the delayed write list.
+ *
+ * This queues a buffer for writeout if it hasn't already been. Note that
+ * neither this routine nor the buffer list submission functions perform
+ * any internal synchronization. It is expected that the lists are thread-local
+ * to the callers.
+ *
+ * Returns true if we queued up the buffer, or false if it already had
+ * been on the buffer list.
*/
-void
+bool
xfs_buf_delwri_queue(
- xfs_buf_t *bp)
+ struct xfs_buf *bp,
+ struct list_head *list)
{
- struct xfs_buftarg *btp = bp->b_target;
-
- trace_xfs_buf_delwri_queue(bp, _RET_IP_);
-
+ ASSERT(xfs_buf_islocked(bp));
ASSERT(!(bp->b_flags & XBF_READ));
- spin_lock(&btp->bt_delwri_lock);
- if (!list_empty(&bp->b_list)) {
- /* if already in the queue, move it to the tail */
- ASSERT(bp->b_flags & _XBF_DELWRI_Q);
- list_move_tail(&bp->b_list, &btp->bt_delwri_queue);
- } else {
- /* start xfsbufd as it is about to have something to do */
- if (list_empty(&btp->bt_delwri_queue))
- wake_up_process(bp->b_target->bt_task);
-
- atomic_inc(&bp->b_hold);
- bp->b_flags |= XBF_DELWRI | _XBF_DELWRI_Q | XBF_ASYNC;
- list_add_tail(&bp->b_list, &btp->bt_delwri_queue);
- }
- bp->b_queuetime = jiffies;
- spin_unlock(&btp->bt_delwri_lock);
-}
-
-void
-xfs_buf_delwri_dequeue(
- xfs_buf_t *bp)
-{
- int dequeued = 0;
-
- spin_lock(&bp->b_target->bt_delwri_lock);
- if ((bp->b_flags & XBF_DELWRI) && !list_empty(&bp->b_list)) {
- ASSERT(bp->b_flags & _XBF_DELWRI_Q);
- list_del_init(&bp->b_list);
- dequeued = 1;
+ /*
+ * If the buffer is already marked delwri it already is queued up
+ * by someone else for imediate writeout. Just ignore it in that
+ * case.
+ */
+ if (bp->b_flags & _XBF_DELWRI_Q) {
+ trace_xfs_buf_delwri_queued(bp, _RET_IP_);
+ return false;
}
- bp->b_flags &= ~(XBF_DELWRI|_XBF_DELWRI_Q);
- spin_unlock(&bp->b_target->bt_delwri_lock);
-
- if (dequeued)
- xfs_buf_rele(bp);
-
- trace_xfs_buf_delwri_dequeue(bp, _RET_IP_);
-}
-/*
- * If a delwri buffer needs to be pushed before it has aged out, then promote
- * it to the head of the delwri queue so that it will be flushed on the next
- * xfsbufd run. We do this by resetting the queuetime of the buffer to be older
- * than the age currently needed to flush the buffer. Hence the next time the
- * xfsbufd sees it is guaranteed to be considered old enough to flush.
- */
-void
-xfs_buf_delwri_promote(
- struct xfs_buf *bp)
-{
- struct xfs_buftarg *btp = bp->b_target;
- long age = xfs_buf_age_centisecs * msecs_to_jiffies(10) + 1;
-
- ASSERT(bp->b_flags & XBF_DELWRI);
- ASSERT(bp->b_flags & _XBF_DELWRI_Q);
+ trace_xfs_buf_delwri_queue(bp, _RET_IP_);
/*
- * Check the buffer age before locking the delayed write queue as we
- * don't need to promote buffers that are already past the flush age.
+ * If a buffer gets written out synchronously or marked stale while it
+ * is on a delwri list we lazily remove it. To do this, the other party
+ * clears the _XBF_DELWRI_Q flag but otherwise leaves the buffer alone.
+ * It remains referenced and on the list. In a rare corner case it
+ * might get readded to a delwri list after the synchronous writeout, in
+ * which case we need just need to re-add the flag here.
*/
- if (bp->b_queuetime < jiffies - age)
- return;
- bp->b_queuetime = jiffies - age;
- spin_lock(&btp->bt_delwri_lock);
- list_move(&bp->b_list, &btp->bt_delwri_queue);
- spin_unlock(&btp->bt_delwri_lock);
-}
-
-/*
- * Move as many buffers as specified to the supplied list
- * idicating if we skipped any buffers to prevent deadlocks.
- */
-STATIC int
-xfs_buf_delwri_split(
- xfs_buftarg_t *target,
- struct list_head *list,
- unsigned long age)
-{
- xfs_buf_t *bp, *n;
- int skipped = 0;
- int force;
-
- force = test_and_clear_bit(XBT_FORCE_FLUSH, &target->bt_flags);
- INIT_LIST_HEAD(list);
- spin_lock(&target->bt_delwri_lock);
- list_for_each_entry_safe(bp, n, &target->bt_delwri_queue, b_list) {
- ASSERT(bp->b_flags & XBF_DELWRI);
-
- if (!xfs_buf_ispinned(bp) && xfs_buf_trylock(bp)) {
- if (!force &&
- time_before(jiffies, bp->b_queuetime + age)) {
- xfs_buf_unlock(bp);
- break;
- }
-
- bp->b_flags &= ~(XBF_DELWRI | _XBF_DELWRI_Q);
- bp->b_flags |= XBF_WRITE;
- list_move_tail(&bp->b_list, list);
- trace_xfs_buf_delwri_split(bp, _RET_IP_);
- } else
- skipped++;
+ bp->b_flags |= _XBF_DELWRI_Q;
+ if (list_empty(&bp->b_list)) {
+ atomic_inc(&bp->b_hold);
+ list_add_tail(&bp->b_list, list);
}
- spin_unlock(&target->bt_delwri_lock);
- return skipped;
+ return true;
}
/*
return 0;
}
-STATIC int
-xfsbufd(
- void *data)
+static int
+__xfs_buf_delwri_submit(
+ struct list_head *buffer_list,
+ struct list_head *io_list,
+ bool wait)
{
- xfs_buftarg_t *target = (xfs_buftarg_t *)data;
-
- current->flags |= PF_MEMALLOC;
-
- set_freezable();
+ struct blk_plug plug;
+ struct xfs_buf *bp, *n;
+ int pinned = 0;
+
+ list_for_each_entry_safe(bp, n, buffer_list, b_list) {
+ if (!wait) {
+ if (xfs_buf_ispinned(bp)) {
+ pinned++;
+ continue;
+ }
+ if (!xfs_buf_trylock(bp))
+ continue;
+ } else {
+ xfs_buf_lock(bp);
+ }
- do {
- long age = xfs_buf_age_centisecs * msecs_to_jiffies(10);
- long tout = xfs_buf_timer_centisecs * msecs_to_jiffies(10);
- struct list_head tmp;
- struct blk_plug plug;
+ /*
+ * Someone else might have written the buffer synchronously or
+ * marked it stale in the meantime. In that case only the
+ * _XBF_DELWRI_Q flag got cleared, and we have to drop the
+ * reference and remove it from the list here.
+ */
+ if (!(bp->b_flags & _XBF_DELWRI_Q)) {
+ list_del_init(&bp->b_list);
+ xfs_buf_relse(bp);
+ continue;
+ }
- if (unlikely(freezing(current)))
- try_to_freeze();
+ list_move_tail(&bp->b_list, io_list);
+ trace_xfs_buf_delwri_split(bp, _RET_IP_);
+ }
- /* sleep for a long time if there is nothing to do. */
- if (list_empty(&target->bt_delwri_queue))
- tout = MAX_SCHEDULE_TIMEOUT;
- schedule_timeout_interruptible(tout);
+ list_sort(NULL, io_list, xfs_buf_cmp);
- xfs_buf_delwri_split(target, &tmp, age);
- list_sort(NULL, &tmp, xfs_buf_cmp);
+ blk_start_plug(&plug);
+ list_for_each_entry_safe(bp, n, io_list, b_list) {
+ bp->b_flags &= ~(_XBF_DELWRI_Q | XBF_ASYNC);
+ bp->b_flags |= XBF_WRITE;
- blk_start_plug(&plug);
- while (!list_empty(&tmp)) {
- struct xfs_buf *bp;
- bp = list_first_entry(&tmp, struct xfs_buf, b_list);
+ if (!wait) {
+ bp->b_flags |= XBF_ASYNC;
list_del_init(&bp->b_list);
- xfs_bdstrat_cb(bp);
}
- blk_finish_plug(&plug);
- } while (!kthread_should_stop());
+ xfs_bdstrat_cb(bp);
+ }
+ blk_finish_plug(&plug);
- return 0;
+ return pinned;
}
/*
- * Go through all incore buffers, and release buffers if they belong to
- * the given device. This is used in filesystem error handling to
- * preserve the consistency of its metadata.
+ * Write out a buffer list asynchronously.
+ *
+ * This will take the @buffer_list, write all non-locked and non-pinned buffers
+ * out and not wait for I/O completion on any of the buffers. This interface
+ * is only safely useable for callers that can track I/O completion by higher
+ * level means, e.g. AIL pushing as the @buffer_list is consumed in this
+ * function.
*/
int
-xfs_flush_buftarg(
- xfs_buftarg_t *target,
- int wait)
+xfs_buf_delwri_submit_nowait(
+ struct list_head *buffer_list)
{
- xfs_buf_t *bp;
- int pincount = 0;
- LIST_HEAD(tmp_list);
- LIST_HEAD(wait_list);
- struct blk_plug plug;
+ LIST_HEAD (io_list);
+ return __xfs_buf_delwri_submit(buffer_list, &io_list, false);
+}
- flush_workqueue(xfslogd_workqueue);
+/*
+ * Write out a buffer list synchronously.
+ *
+ * This will take the @buffer_list, write all buffers out and wait for I/O
+ * completion on all of the buffers. @buffer_list is consumed by the function,
+ * so callers must have some other way of tracking buffers if they require such
+ * functionality.
+ */
+int
+xfs_buf_delwri_submit(
+ struct list_head *buffer_list)
+{
+ LIST_HEAD (io_list);
+ int error = 0, error2;
+ struct xfs_buf *bp;
- set_bit(XBT_FORCE_FLUSH, &target->bt_flags);
- pincount = xfs_buf_delwri_split(target, &tmp_list, 0);
+ __xfs_buf_delwri_submit(buffer_list, &io_list, true);
- /*
- * Dropped the delayed write list lock, now walk the temporary list.
- * All I/O is issued async and then if we need to wait for completion
- * we do that after issuing all the IO.
- */
- list_sort(NULL, &tmp_list, xfs_buf_cmp);
+ /* Wait for IO to complete. */
+ while (!list_empty(&io_list)) {
+ bp = list_first_entry(&io_list, struct xfs_buf, b_list);
- blk_start_plug(&plug);
- while (!list_empty(&tmp_list)) {
- bp = list_first_entry(&tmp_list, struct xfs_buf, b_list);
- ASSERT(target == bp->b_target);
list_del_init(&bp->b_list);
- if (wait) {
- bp->b_flags &= ~XBF_ASYNC;
- list_add(&bp->b_list, &wait_list);
- }
- xfs_bdstrat_cb(bp);
- }
- blk_finish_plug(&plug);
-
- if (wait) {
- /* Wait for IO to complete. */
- while (!list_empty(&wait_list)) {
- bp = list_first_entry(&wait_list, struct xfs_buf, b_list);
-
- list_del_init(&bp->b_list);
- xfs_buf_iowait(bp);
- xfs_buf_relse(bp);
- }
+ error2 = xfs_buf_iowait(bp);
+ xfs_buf_relse(bp);
+ if (!error)
+ error = error2;
}
- return pincount;
+ return error;
}
int __init
#define XBF_MAPPED (1 << 3) /* buffer mapped (b_addr valid) */
#define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */
#define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */
-#define XBF_DELWRI (1 << 6) /* buffer has dirty pages */
-#define XBF_STALE (1 << 7) /* buffer has been staled, do not find it */
+#define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */
/* I/O hints for the BIO layer */
#define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */
/* flags used only internally */
#define _XBF_PAGES (1 << 20)/* backed by refcounted pages */
#define _XBF_KMEM (1 << 21)/* backed by heap memory */
-#define _XBF_DELWRI_Q (1 << 22)/* buffer on delwri queue */
+#define _XBF_DELWRI_Q (1 << 22)/* buffer on a delwri queue */
typedef unsigned int xfs_buf_flags_t;
{ XBF_MAPPED, "MAPPED" }, \
{ XBF_ASYNC, "ASYNC" }, \
{ XBF_DONE, "DONE" }, \
- { XBF_DELWRI, "DELWRI" }, \
{ XBF_STALE, "STALE" }, \
{ XBF_SYNCIO, "SYNCIO" }, \
{ XBF_FUA, "FUA" }, \
{ _XBF_KMEM, "KMEM" }, \
{ _XBF_DELWRI_Q, "DELWRI_Q" }
-typedef enum {
- XBT_FORCE_FLUSH = 0,
-} xfs_buftarg_flags_t;
-
typedef struct xfs_buftarg {
dev_t bt_dev;
struct block_device *bt_bdev;
unsigned int bt_sshift;
size_t bt_smask;
- /* per device delwri queue */
- struct task_struct *bt_task;
- struct list_head bt_delwri_queue;
- spinlock_t bt_delwri_lock;
- unsigned long bt_flags;
-
/* LRU control structures */
struct shrinker bt_shrinker;
struct list_head bt_lru;
struct xfs_trans *b_transp;
struct page **b_pages; /* array of page pointers */
struct page *b_page_array[XB_PAGES]; /* inline pages */
- unsigned long b_queuetime; /* time buffer was queued */
atomic_t b_pin_count; /* pin count */
atomic_t b_io_remaining; /* #outstanding I/O requests */
unsigned int b_page_count; /* size of page array */
extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t);
/* Delayed Write Buffer Routines */
-extern void xfs_buf_delwri_queue(struct xfs_buf *);
-extern void xfs_buf_delwri_dequeue(struct xfs_buf *);
-extern void xfs_buf_delwri_promote(struct xfs_buf *);
+extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *);
+extern int xfs_buf_delwri_submit(struct list_head *);
+extern int xfs_buf_delwri_submit_nowait(struct list_head *);
/* Buffer Daemon Setup Routines */
extern int xfs_buf_init(void);
extern void xfs_buf_terminate(void);
#define XFS_BUF_ZEROFLAGS(bp) \
- ((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI| \
+ ((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC| \
XBF_SYNCIO|XBF_FUA|XBF_FLUSH))
void xfs_buf_stale(struct xfs_buf *bp);
#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE)
#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE)
-#define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI)
-
#define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE)
#define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE)
#define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE)
extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *);
extern void xfs_wait_buftarg(xfs_buftarg_t *);
extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
-extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
if (freed && stale) {
ASSERT(bip->bli_flags & XFS_BLI_STALE);
ASSERT(xfs_buf_islocked(bp));
- ASSERT(!(XFS_BUF_ISDELAYWRITE(bp)));
ASSERT(XFS_BUF_ISSTALE(bp));
ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL);
}
}
-/*
- * This is called to attempt to lock the buffer associated with this
- * buf log item. Don't sleep on the buffer lock. If we can't get
- * the lock right away, return 0. If we can get the lock, take a
- * reference to the buffer. If this is a delayed write buffer that
- * needs AIL help to be written back, invoke the pushbuf routine
- * rather than the normal success path.
- */
STATIC uint
-xfs_buf_item_trylock(
- struct xfs_log_item *lip)
+xfs_buf_item_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list)
{
struct xfs_buf_log_item *bip = BUF_ITEM(lip);
struct xfs_buf *bp = bip->bli_buf;
+ uint rval = XFS_ITEM_SUCCESS;
if (xfs_buf_ispinned(bp))
return XFS_ITEM_PINNED;
if (!xfs_buf_trylock(bp))
return XFS_ITEM_LOCKED;
- /* take a reference to the buffer. */
- xfs_buf_hold(bp);
-
ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
- trace_xfs_buf_item_trylock(bip);
- if (XFS_BUF_ISDELAYWRITE(bp))
- return XFS_ITEM_PUSHBUF;
- return XFS_ITEM_SUCCESS;
+
+ trace_xfs_buf_item_push(bip);
+
+ if (!xfs_buf_delwri_queue(bp, buffer_list))
+ rval = XFS_ITEM_FLUSHING;
+ xfs_buf_unlock(bp);
+ return rval;
}
/*
return lsn;
}
-/*
- * The buffer is locked, but is not a delayed write buffer.
- */
-STATIC void
-xfs_buf_item_push(
- struct xfs_log_item *lip)
-{
- struct xfs_buf_log_item *bip = BUF_ITEM(lip);
- struct xfs_buf *bp = bip->bli_buf;
-
- ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
- ASSERT(!XFS_BUF_ISDELAYWRITE(bp));
-
- trace_xfs_buf_item_push(bip);
-
- xfs_buf_delwri_queue(bp);
- xfs_buf_relse(bp);
-}
-
-/*
- * The buffer is locked and is a delayed write buffer. Promote the buffer
- * in the delayed write queue as the caller knows that they must invoke
- * the xfsbufd to get this buffer written. We have to unlock the buffer
- * to allow the xfsbufd to write it, too.
- */
-STATIC bool
-xfs_buf_item_pushbuf(
- struct xfs_log_item *lip)
-{
- struct xfs_buf_log_item *bip = BUF_ITEM(lip);
- struct xfs_buf *bp = bip->bli_buf;
-
- ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
- ASSERT(XFS_BUF_ISDELAYWRITE(bp));
-
- trace_xfs_buf_item_pushbuf(bip);
-
- xfs_buf_delwri_promote(bp);
- xfs_buf_relse(bp);
- return true;
-}
-
STATIC void
xfs_buf_item_committing(
struct xfs_log_item *lip,
.iop_format = xfs_buf_item_format,
.iop_pin = xfs_buf_item_pin,
.iop_unpin = xfs_buf_item_unpin,
- .iop_trylock = xfs_buf_item_trylock,
.iop_unlock = xfs_buf_item_unlock,
.iop_committed = xfs_buf_item_committed,
.iop_push = xfs_buf_item_push,
- .iop_pushbuf = xfs_buf_item_pushbuf,
.iop_committing = xfs_buf_item_committing
};
* If the write was asynchronous then no one will be looking for the
* error. Clear the error state and write the buffer out again.
*
- * During sync or umount we'll write all pending buffers again
- * synchronous, which will catch these errors if they keep hanging
- * around.
+ * XXX: This helps against transient write errors, but we need to find
+ * a way to shut the filesystem down if the writes keep failing.
+ *
+ * In practice we'll shut the filesystem down soon as non-transient
+ * erorrs tend to affect the whole device and a failing log write
+ * will make us give up. But we really ought to do better here.
*/
if (XFS_BUF_ISASYNC(bp)) {
+ ASSERT(bp->b_iodone != NULL);
+
+ trace_xfs_buf_item_iodone_async(bp, _RET_IP_);
+
xfs_buf_ioerror(bp, 0); /* errno of 0 unsets the flag */
if (!XFS_BUF_ISSTALE(bp)) {
- xfs_buf_delwri_queue(bp);
- XFS_BUF_DONE(bp);
+ bp->b_flags |= XBF_WRITE | XBF_ASYNC | XBF_DONE;
+ xfs_bdstrat_cb(bp);
+ } else {
+ xfs_buf_relse(bp);
}
- ASSERT(bp->b_iodone != NULL);
- trace_xfs_buf_item_iodone_async(bp, _RET_IP_);
- xfs_buf_relse(bp);
+
return;
}
}
}
-/*
- * Give the buffer a little push if it is incore and
- * wait on the flush lock.
- */
-void
-xfs_dqflock_pushbuf_wait(
- xfs_dquot_t *dqp)
-{
- xfs_mount_t *mp = dqp->q_mount;
- xfs_buf_t *bp;
-
- /*
- * Check to see if the dquot has been flushed delayed
- * write. If so, grab its buffer and send it
- * out immediately. We'll be able to acquire
- * the flush lock when the I/O completes.
- */
- bp = xfs_incore(mp->m_ddev_targp, dqp->q_blkno,
- mp->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK);
- if (!bp)
- goto out_lock;
-
- if (XFS_BUF_ISDELAYWRITE(bp)) {
- if (xfs_buf_ispinned(bp))
- xfs_log_force(mp, 0);
- xfs_buf_delwri_promote(bp);
- wake_up_process(bp->b_target->bt_task);
- }
- xfs_buf_relse(bp);
-out_lock:
- xfs_dqflock(dqp);
-}
-
int __init
xfs_qm_init(void)
{
extern void xfs_qm_dqput(xfs_dquot_t *);
extern void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
-extern void xfs_dqflock_pushbuf_wait(struct xfs_dquot *dqp);
static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp)
{
wake_up(&dqp->q_pinwait);
}
-/*
- * Given the logitem, this writes the corresponding dquot entry to disk
- * asynchronously. This is called with the dquot entry securely locked;
- * we simply get xfs_qm_dqflush() to do the work, and unlock the dquot
- * at the end.
- */
-STATIC void
-xfs_qm_dquot_logitem_push(
- struct xfs_log_item *lip)
-{
- struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
- struct xfs_buf *bp = NULL;
- int error;
-
- ASSERT(XFS_DQ_IS_LOCKED(dqp));
- ASSERT(!completion_done(&dqp->q_flush));
- ASSERT(atomic_read(&dqp->q_pincount) == 0);
-
- /*
- * Since we were able to lock the dquot's flush lock and
- * we found it on the AIL, the dquot must be dirty. This
- * is because the dquot is removed from the AIL while still
- * holding the flush lock in xfs_dqflush_done(). Thus, if
- * we found it in the AIL and were able to obtain the flush
- * lock without sleeping, then there must not have been
- * anyone in the process of flushing the dquot.
- */
- error = xfs_qm_dqflush(dqp, &bp);
- if (error) {
- xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p",
- __func__, error, dqp);
- goto out_unlock;
- }
-
- xfs_buf_delwri_queue(bp);
- xfs_buf_relse(bp);
-out_unlock:
- xfs_dqunlock(dqp);
-}
-
STATIC xfs_lsn_t
xfs_qm_dquot_logitem_committed(
struct xfs_log_item *lip,
wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
}
-/*
- * This is called when IOP_TRYLOCK returns XFS_ITEM_PUSHBUF to indicate that
- * the dquot is locked by us, but the flush lock isn't. So, here we are
- * going to see if the relevant dquot buffer is incore, waiting on DELWRI.
- * If so, we want to push it out to help us take this item off the AIL as soon
- * as possible.
- *
- * We must not be holding the AIL lock at this point. Calling incore() to
- * search the buffer cache can be a time consuming thing, and AIL lock is a
- * spinlock.
- */
-STATIC bool
-xfs_qm_dquot_logitem_pushbuf(
- struct xfs_log_item *lip)
-{
- struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
- struct xfs_dquot *dqp = qlip->qli_dquot;
- struct xfs_buf *bp;
- bool ret = true;
-
- ASSERT(XFS_DQ_IS_LOCKED(dqp));
-
- /*
- * If flushlock isn't locked anymore, chances are that the
- * inode flush completed and the inode was taken off the AIL.
- * So, just get out.
- */
- if (completion_done(&dqp->q_flush) ||
- !(lip->li_flags & XFS_LI_IN_AIL)) {
- xfs_dqunlock(dqp);
- return true;
- }
-
- bp = xfs_incore(dqp->q_mount->m_ddev_targp, qlip->qli_format.qlf_blkno,
- dqp->q_mount->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK);
- xfs_dqunlock(dqp);
- if (!bp)
- return true;
- if (XFS_BUF_ISDELAYWRITE(bp))
- xfs_buf_delwri_promote(bp);
- if (xfs_buf_ispinned(bp))
- ret = false;
- xfs_buf_relse(bp);
- return ret;
-}
-
-/*
- * This is called to attempt to lock the dquot associated with this
- * dquot log item. Don't sleep on the dquot lock or the flush lock.
- * If the flush lock is already held, indicating that the dquot has
- * been or is in the process of being flushed, then see if we can
- * find the dquot's buffer in the buffer cache without sleeping. If
- * we can and it is marked delayed write, then we want to send it out.
- * We delay doing so until the push routine, though, to avoid sleeping
- * in any device strategy routines.
- */
STATIC uint
-xfs_qm_dquot_logitem_trylock(
- struct xfs_log_item *lip)
+xfs_qm_dquot_logitem_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list)
{
struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
+ struct xfs_buf *bp = NULL;
+ uint rval = XFS_ITEM_SUCCESS;
+ int error;
if (atomic_read(&dqp->q_pincount) > 0)
return XFS_ITEM_PINNED;
* taking the quota lock.
*/
if (atomic_read(&dqp->q_pincount) > 0) {
- xfs_dqunlock(dqp);
- return XFS_ITEM_PINNED;
+ rval = XFS_ITEM_PINNED;
+ goto out_unlock;
}
+ /*
+ * Someone else is already flushing the dquot. Nothing we can do
+ * here but wait for the flush to finish and remove the item from
+ * the AIL.
+ */
if (!xfs_dqflock_nowait(dqp)) {
- /*
- * dquot has already been flushed to the backing buffer,
- * leave it locked, pushbuf routine will unlock it.
- */
- return XFS_ITEM_PUSHBUF;
+ rval = XFS_ITEM_FLUSHING;
+ goto out_unlock;
+ }
+
+ spin_unlock(&lip->li_ailp->xa_lock);
+
+ error = xfs_qm_dqflush(dqp, &bp);
+ if (error) {
+ xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p",
+ __func__, error, dqp);
+ } else {
+ if (!xfs_buf_delwri_queue(bp, buffer_list))
+ rval = XFS_ITEM_FLUSHING;
+ xfs_buf_relse(bp);
}
- ASSERT(lip->li_flags & XFS_LI_IN_AIL);
- return XFS_ITEM_SUCCESS;
+ spin_lock(&lip->li_ailp->xa_lock);
+out_unlock:
+ xfs_dqunlock(dqp);
+ return rval;
}
/*
.iop_format = xfs_qm_dquot_logitem_format,
.iop_pin = xfs_qm_dquot_logitem_pin,
.iop_unpin = xfs_qm_dquot_logitem_unpin,
- .iop_trylock = xfs_qm_dquot_logitem_trylock,
.iop_unlock = xfs_qm_dquot_logitem_unlock,
.iop_committed = xfs_qm_dquot_logitem_committed,
.iop_push = xfs_qm_dquot_logitem_push,
- .iop_pushbuf = xfs_qm_dquot_logitem_pushbuf,
.iop_committing = xfs_qm_dquot_logitem_committing
};
}
/*
- * Quotaoff items have no locking, so just return success.
+ * There isn't much you can do to push a quotaoff item. It is simply
+ * stuck waiting for the log to be flushed to disk.
*/
STATIC uint
-xfs_qm_qoff_logitem_trylock(
- struct xfs_log_item *lip)
+xfs_qm_qoff_logitem_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list)
{
return XFS_ITEM_LOCKED;
}
return lsn;
}
-/*
- * There isn't much you can do to push on an quotaoff item. It is simply
- * stuck waiting for the log to be flushed to disk.
- */
-STATIC void
-xfs_qm_qoff_logitem_push(
- struct xfs_log_item *lip)
-{
-}
-
-
STATIC xfs_lsn_t
xfs_qm_qoffend_logitem_committed(
struct xfs_log_item *lip,
.iop_format = xfs_qm_qoff_logitem_format,
.iop_pin = xfs_qm_qoff_logitem_pin,
.iop_unpin = xfs_qm_qoff_logitem_unpin,
- .iop_trylock = xfs_qm_qoff_logitem_trylock,
.iop_unlock = xfs_qm_qoff_logitem_unlock,
.iop_committed = xfs_qm_qoffend_logitem_committed,
.iop_push = xfs_qm_qoff_logitem_push,
.iop_format = xfs_qm_qoff_logitem_format,
.iop_pin = xfs_qm_qoff_logitem_pin,
.iop_unpin = xfs_qm_qoff_logitem_unpin,
- .iop_trylock = xfs_qm_qoff_logitem_trylock,
.iop_unlock = xfs_qm_qoff_logitem_unlock,
.iop_committed = xfs_qm_qoff_logitem_committed,
.iop_push = xfs_qm_qoff_logitem_push,
}
/*
- * Efi items have no locking or pushing. However, since EFIs are
- * pulled from the AIL when their corresponding EFDs are committed
- * to disk, their situation is very similar to being pinned. Return
- * XFS_ITEM_PINNED so that the caller will eventually flush the log.
- * This should help in getting the EFI out of the AIL.
+ * Efi items have no locking or pushing. However, since EFIs are pulled from
+ * the AIL when their corresponding EFDs are committed to disk, their situation
+ * is very similar to being pinned. Return XFS_ITEM_PINNED so that the caller
+ * will eventually flush the log. This should help in getting the EFI out of
+ * the AIL.
*/
STATIC uint
-xfs_efi_item_trylock(
- struct xfs_log_item *lip)
+xfs_efi_item_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list)
{
return XFS_ITEM_PINNED;
}
-/*
- * Efi items have no locking, so just return.
- */
STATIC void
xfs_efi_item_unlock(
struct xfs_log_item *lip)
return lsn;
}
-/*
- * There isn't much you can do to push on an efi item. It is simply
- * stuck waiting for all of its corresponding efd items to be
- * committed to disk.
- */
-STATIC void
-xfs_efi_item_push(
- struct xfs_log_item *lip)
-{
-}
-
/*
* The EFI dependency tracking op doesn't do squat. It can't because
* it doesn't know where the free extent is coming from. The dependency
.iop_format = xfs_efi_item_format,
.iop_pin = xfs_efi_item_pin,
.iop_unpin = xfs_efi_item_unpin,
- .iop_trylock = xfs_efi_item_trylock,
.iop_unlock = xfs_efi_item_unlock,
.iop_committed = xfs_efi_item_committed,
.iop_push = xfs_efi_item_push,
}
/*
- * Efd items have no locking, so just return success.
+ * There isn't much you can do to push on an efd item. It is simply stuck
+ * waiting for the log to be flushed to disk.
*/
STATIC uint
-xfs_efd_item_trylock(
- struct xfs_log_item *lip)
+xfs_efd_item_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list)
{
- return XFS_ITEM_LOCKED;
+ return XFS_ITEM_PINNED;
}
-/*
- * Efd items have no locking or pushing, so return failure
- * so that the caller doesn't bother with us.
- */
STATIC void
xfs_efd_item_unlock(
struct xfs_log_item *lip)
return (xfs_lsn_t)-1;
}
-/*
- * There isn't much you can do to push on an efd item. It is simply
- * stuck waiting for the log to be flushed to disk.
- */
-STATIC void
-xfs_efd_item_push(
- struct xfs_log_item *lip)
-{
-}
-
/*
* The EFD dependency tracking op doesn't do squat. It can't because
* it doesn't know where the free extent is coming from. The dependency
.iop_format = xfs_efd_item_format,
.iop_pin = xfs_efd_item_pin,
.iop_unpin = xfs_efd_item_unpin,
- .iop_trylock = xfs_efd_item_trylock,
.iop_unlock = xfs_efd_item_unlock,
.iop_committed = xfs_efd_item_committed,
.iop_push = xfs_efd_item_push,
*/
rcu_read_unlock();
/*
- * Clean up the buffer. If it was B_DELWRI, just release it --
+ * Clean up the buffer. If it was delwri, just release it --
* brelse can handle it with no problems. If not, shut down the
* filesystem before releasing the buffer.
*/
- bufwasdelwri = XFS_BUF_ISDELAYWRITE(bp);
+ bufwasdelwri = (bp->b_flags & _XBF_DELWRI_Q);
if (bufwasdelwri)
xfs_buf_relse(bp);
return XFS_ERROR(EFSCORRUPTED);
}
-void
-xfs_promote_inode(
- struct xfs_inode *ip)
-{
- struct xfs_buf *bp;
-
- ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
-
- bp = xfs_incore(ip->i_mount->m_ddev_targp, ip->i_imap.im_blkno,
- ip->i_imap.im_len, XBF_TRYLOCK);
- if (!bp)
- return;
-
- if (XFS_BUF_ISDELAYWRITE(bp)) {
- xfs_buf_delwri_promote(bp);
- wake_up_process(ip->i_mount->m_ddev_targp->bt_task);
- }
-
- xfs_buf_relse(bp);
-}
-
/*
* Return a pointer to the extent record at file index idx.
*/
void xfs_iext_realloc(xfs_inode_t *, int, int);
void xfs_iunpin_wait(xfs_inode_t *);
int xfs_iflush(struct xfs_inode *, struct xfs_buf **);
-void xfs_promote_inode(struct xfs_inode *);
void xfs_lock_inodes(xfs_inode_t **, int, uint);
void xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);
wake_up_bit(&ip->i_flags, __XFS_IPINNED_BIT);
}
-/*
- * This is called to attempt to lock the inode associated with this
- * inode log item, in preparation for the push routine which does the actual
- * iflush. Don't sleep on the inode lock or the flush lock.
- *
- * If the flush lock is already held, indicating that the inode has
- * been or is in the process of being flushed, then (ideally) we'd like to
- * see if the inode's buffer is still incore, and if so give it a nudge.
- * We delay doing so until the pushbuf routine, though, to avoid holding
- * the AIL lock across a call to the blackhole which is the buffer cache.
- * Also we don't want to sleep in any device strategy routines, which can happen
- * if we do the subsequent bawrite in here.
- */
STATIC uint
-xfs_inode_item_trylock(
- struct xfs_log_item *lip)
+xfs_inode_item_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list)
{
struct xfs_inode_log_item *iip = INODE_ITEM(lip);
struct xfs_inode *ip = iip->ili_inode;
+ struct xfs_buf *bp = NULL;
+ uint rval = XFS_ITEM_SUCCESS;
+ int error;
if (xfs_ipincount(ip) > 0)
return XFS_ITEM_PINNED;
* taking the ilock.
*/
if (xfs_ipincount(ip) > 0) {
- xfs_iunlock(ip, XFS_ILOCK_SHARED);
- return XFS_ITEM_PINNED;
+ rval = XFS_ITEM_PINNED;
+ goto out_unlock;
}
+ /*
+ * Someone else is already flushing the inode. Nothing we can do
+ * here but wait for the flush to finish and remove the item from
+ * the AIL.
+ */
if (!xfs_iflock_nowait(ip)) {
- /*
- * inode has already been flushed to the backing buffer,
- * leave it locked in shared mode, pushbuf routine will
- * unlock it.
- */
- return XFS_ITEM_PUSHBUF;
+ rval = XFS_ITEM_FLUSHING;
+ goto out_unlock;
}
- /* Stale items should force out the iclog */
+ /*
+ * Stale inode items should force out the iclog.
+ */
if (ip->i_flags & XFS_ISTALE) {
xfs_ifunlock(ip);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
return XFS_ITEM_PINNED;
}
-#ifdef DEBUG
- if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
- ASSERT(iip->ili_fields != 0);
- ASSERT(iip->ili_logged == 0);
- ASSERT(lip->li_flags & XFS_LI_IN_AIL);
+ ASSERT(iip->ili_fields != 0 || XFS_FORCED_SHUTDOWN(ip->i_mount));
+ ASSERT(iip->ili_logged == 0 || XFS_FORCED_SHUTDOWN(ip->i_mount));
+
+ spin_unlock(&lip->li_ailp->xa_lock);
+
+ error = xfs_iflush(ip, &bp);
+ if (!error) {
+ if (!xfs_buf_delwri_queue(bp, buffer_list))
+ rval = XFS_ITEM_FLUSHING;
+ xfs_buf_relse(bp);
}
-#endif
- return XFS_ITEM_SUCCESS;
+
+ spin_lock(&lip->li_ailp->xa_lock);
+out_unlock:
+ xfs_iunlock(ip, XFS_ILOCK_SHARED);
+ return rval;
}
/*
return lsn;
}
-/*
- * This gets called by xfs_trans_push_ail(), when IOP_TRYLOCK
- * failed to get the inode flush lock but did get the inode locked SHARED.
- * Here we're trying to see if the inode buffer is incore, and if so whether it's
- * marked delayed write. If that's the case, we'll promote it and that will
- * allow the caller to write the buffer by triggering the xfsbufd to run.
- */
-STATIC bool
-xfs_inode_item_pushbuf(
- struct xfs_log_item *lip)
-{
- struct xfs_inode_log_item *iip = INODE_ITEM(lip);
- struct xfs_inode *ip = iip->ili_inode;
- struct xfs_buf *bp;
- bool ret = true;
-
- ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED));
-
- /*
- * If a flush is not in progress anymore, chances are that the
- * inode was taken off the AIL. So, just get out.
- */
- if (!xfs_isiflocked(ip) ||
- !(lip->li_flags & XFS_LI_IN_AIL)) {
- xfs_iunlock(ip, XFS_ILOCK_SHARED);
- return true;
- }
-
- bp = xfs_incore(ip->i_mount->m_ddev_targp, iip->ili_format.ilf_blkno,
- iip->ili_format.ilf_len, XBF_TRYLOCK);
-
- xfs_iunlock(ip, XFS_ILOCK_SHARED);
- if (!bp)
- return true;
- if (XFS_BUF_ISDELAYWRITE(bp))
- xfs_buf_delwri_promote(bp);
- if (xfs_buf_ispinned(bp))
- ret = false;
- xfs_buf_relse(bp);
- return ret;
-}
-
-/*
- * This is called to asynchronously write the inode associated with this
- * inode log item out to disk. The inode will already have been locked by
- * a successful call to xfs_inode_item_trylock().
- */
-STATIC void
-xfs_inode_item_push(
- struct xfs_log_item *lip)
-{
- struct xfs_inode_log_item *iip = INODE_ITEM(lip);
- struct xfs_inode *ip = iip->ili_inode;
- struct xfs_buf *bp = NULL;
- int error;
-
- ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED));
- ASSERT(xfs_isiflocked(ip));
-
- /*
- * Since we were able to lock the inode's flush lock and
- * we found it on the AIL, the inode must be dirty. This
- * is because the inode is removed from the AIL while still
- * holding the flush lock in xfs_iflush_done(). Thus, if
- * we found it in the AIL and were able to obtain the flush
- * lock without sleeping, then there must not have been
- * anyone in the process of flushing the inode.
- */
- ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || iip->ili_fields != 0);
-
- /*
- * Push the inode to it's backing buffer. This will not remove the
- * inode from the AIL - a further push will be required to trigger a
- * buffer push. However, this allows all the dirty inodes to be pushed
- * to the buffer before it is pushed to disk. The buffer IO completion
- * will pull the inode from the AIL, mark it clean and unlock the flush
- * lock.
- */
- error = xfs_iflush(ip, &bp);
- if (!error) {
- xfs_buf_delwri_queue(bp);
- xfs_buf_relse(bp);
- }
- xfs_iunlock(ip, XFS_ILOCK_SHARED);
-}
-
/*
* XXX rcc - this one really has to do something. Probably needs
* to stamp in a new field in the incore inode.
.iop_format = xfs_inode_item_format,
.iop_pin = xfs_inode_item_pin,
.iop_unpin = xfs_inode_item_unpin,
- .iop_trylock = xfs_inode_item_trylock,
.iop_unlock = xfs_inode_item_unlock,
.iop_committed = xfs_inode_item_committed,
.iop_push = xfs_inode_item_push,
- .iop_pushbuf = xfs_inode_item_pushbuf,
.iop_committing = xfs_inode_item_committing
};
STATIC int
xlog_recover_buffer_pass2(
xlog_t *log,
+ struct list_head *buffer_list,
xlog_recover_item_t *item)
{
xfs_buf_log_format_t *buf_f = item->ri_buf[0].i_addr;
} else {
ASSERT(bp->b_target->bt_mount == mp);
bp->b_iodone = xlog_recover_iodone;
- xfs_buf_delwri_queue(bp);
+ xfs_buf_delwri_queue(bp, buffer_list);
}
xfs_buf_relse(bp);
STATIC int
xlog_recover_inode_pass2(
xlog_t *log,
+ struct list_head *buffer_list,
xlog_recover_item_t *item)
{
xfs_inode_log_format_t *in_f;
write_inode_buffer:
ASSERT(bp->b_target->bt_mount == mp);
bp->b_iodone = xlog_recover_iodone;
- xfs_buf_delwri_queue(bp);
+ xfs_buf_delwri_queue(bp, buffer_list);
xfs_buf_relse(bp);
error:
if (need_free)
STATIC int
xlog_recover_dquot_pass2(
xlog_t *log,
+ struct list_head *buffer_list,
xlog_recover_item_t *item)
{
xfs_mount_t *mp = log->l_mp;
ASSERT(dq_f->qlf_size == 2);
ASSERT(bp->b_target->bt_mount == mp);
bp->b_iodone = xlog_recover_iodone;
- xfs_buf_delwri_queue(bp);
+ xfs_buf_delwri_queue(bp, buffer_list);
xfs_buf_relse(bp);
return (0);
xlog_recover_commit_pass2(
struct log *log,
struct xlog_recover *trans,
+ struct list_head *buffer_list,
xlog_recover_item_t *item)
{
trace_xfs_log_recover_item_recover(log, trans, item, XLOG_RECOVER_PASS2);
switch (ITEM_TYPE(item)) {
case XFS_LI_BUF:
- return xlog_recover_buffer_pass2(log, item);
+ return xlog_recover_buffer_pass2(log, buffer_list, item);
case XFS_LI_INODE:
- return xlog_recover_inode_pass2(log, item);
+ return xlog_recover_inode_pass2(log, buffer_list, item);
case XFS_LI_EFI:
return xlog_recover_efi_pass2(log, item, trans->r_lsn);
case XFS_LI_EFD:
return xlog_recover_efd_pass2(log, item);
case XFS_LI_DQUOT:
- return xlog_recover_dquot_pass2(log, item);
+ return xlog_recover_dquot_pass2(log, buffer_list, item);
case XFS_LI_QUOTAOFF:
/* nothing to do in pass2 */
return 0;
struct xlog_recover *trans,
int pass)
{
- int error = 0;
+ int error = 0, error2;
xlog_recover_item_t *item;
+ LIST_HEAD (buffer_list);
hlist_del(&trans->r_list);
return error;
list_for_each_entry(item, &trans->r_itemq, ri_list) {
- if (pass == XLOG_RECOVER_PASS1)
+ switch (pass) {
+ case XLOG_RECOVER_PASS1:
error = xlog_recover_commit_pass1(log, trans, item);
- else
- error = xlog_recover_commit_pass2(log, trans, item);
+ break;
+ case XLOG_RECOVER_PASS2:
+ error = xlog_recover_commit_pass2(log, trans,
+ &buffer_list, item);
+ break;
+ default:
+ ASSERT(0);
+ }
+
if (error)
- return error;
+ goto out;
}
xlog_recover_free_trans(trans);
- return 0;
+
+out:
+ error2 = xfs_buf_delwri_submit(&buffer_list);
+ return error ? error : error2;
}
STATIC int
* First replay the images in the log.
*/
error = xlog_do_log_recovery(log, head_blk, tail_blk);
- if (error) {
+ if (error)
return error;
- }
-
- xfs_flush_buftarg(log->l_mp->m_ddev_targp, 1);
/*
* If IO errors happened during recovery, bail out.
bp = xfs_getsb(log->l_mp, 0);
XFS_BUF_UNDONE(bp);
ASSERT(!(XFS_BUF_ISWRITE(bp)));
- ASSERT(!(XFS_BUF_ISDELAYWRITE(bp)));
XFS_BUF_READ(bp);
XFS_BUF_UNASYNC(bp);
xfsbdstrat(log->l_mp, bp);
xfs_qm_dquot_walk(
struct xfs_mount *mp,
int type,
- int (*execute)(struct xfs_dquot *dqp))
+ int (*execute)(struct xfs_dquot *dqp, void *data),
+ void *data)
{
struct xfs_quotainfo *qi = mp->m_quotainfo;
struct radix_tree_root *tree = XFS_DQUOT_TREE(qi, type);
next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
- error = execute(batch[i]);
+ error = execute(batch[i], data);
if (error == EAGAIN) {
skipped++;
continue;
*/
STATIC int
xfs_qm_dqpurge(
- struct xfs_dquot *dqp)
+ struct xfs_dquot *dqp,
+ void *data)
{
struct xfs_mount *mp = dqp->q_mount;
struct xfs_quotainfo *qi = mp->m_quotainfo;
dqp->dq_flags |= XFS_DQ_FREEING;
- /*
- * If we're turning off quotas, we have to make sure that, for
- * example, we don't delete quota disk blocks while dquots are
- * in the process of getting written to those disk blocks.
- * This dquot might well be on AIL, and we can't leave it there
- * if we're turning off quotas. Basically, we need this flush
- * lock, and are willing to block on it.
- */
- if (!xfs_dqflock_nowait(dqp)) {
- /*
- * Block on the flush lock after nudging dquot buffer,
- * if it is incore.
- */
- xfs_dqflock_pushbuf_wait(dqp);
- }
+ xfs_dqflock(dqp);
/*
* If we are turning this type of quotas off, we don't care
uint flags)
{
if (flags & XFS_QMOPT_UQUOTA)
- xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge);
+ xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
if (flags & XFS_QMOPT_GQUOTA)
- xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge);
+ xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
if (flags & XFS_QMOPT_PQUOTA)
- xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge);
+ xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
}
/*
STATIC int
xfs_qm_dqiter_bufs(
- xfs_mount_t *mp,
- xfs_dqid_t firstid,
- xfs_fsblock_t bno,
- xfs_filblks_t blkcnt,
- uint flags)
+ struct xfs_mount *mp,
+ xfs_dqid_t firstid,
+ xfs_fsblock_t bno,
+ xfs_filblks_t blkcnt,
+ uint flags,
+ struct list_head *buffer_list)
{
- xfs_buf_t *bp;
- int error;
- int type;
+ struct xfs_buf *bp;
+ int error;
+ int type;
ASSERT(blkcnt > 0);
type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
break;
xfs_qm_reset_dqcounts(mp, bp, firstid, type);
- xfs_buf_delwri_queue(bp);
+ xfs_buf_delwri_queue(bp, buffer_list);
xfs_buf_relse(bp);
/*
* goto the next block.
bno++;
firstid += mp->m_quotainfo->qi_dqperchunk;
}
+
return error;
}
*/
STATIC int
xfs_qm_dqiterate(
- xfs_mount_t *mp,
- xfs_inode_t *qip,
- uint flags)
+ struct xfs_mount *mp,
+ struct xfs_inode *qip,
+ uint flags,
+ struct list_head *buffer_list)
{
- xfs_bmbt_irec_t *map;
+ struct xfs_bmbt_irec *map;
int i, nmaps; /* number of map entries */
int error; /* return value */
xfs_fileoff_t lblkno;
* Iterate thru all the blks in the extent and
* reset the counters of all the dquots inside them.
*/
- if ((error = xfs_qm_dqiter_bufs(mp,
- firstid,
- map[i].br_startblock,
- map[i].br_blockcount,
- flags))) {
- break;
- }
+ error = xfs_qm_dqiter_bufs(mp, firstid,
+ map[i].br_startblock,
+ map[i].br_blockcount,
+ flags, buffer_list);
+ if (error)
+ goto out;
}
-
- if (error)
- break;
} while (nmaps > 0);
+out:
kmem_free(map);
-
return error;
}
STATIC int
xfs_qm_flush_one(
- struct xfs_dquot *dqp)
+ struct xfs_dquot *dqp,
+ void *data)
{
+ struct list_head *buffer_list = data;
struct xfs_buf *bp = NULL;
int error = 0;
if (!XFS_DQ_IS_DIRTY(dqp))
goto out_unlock;
- if (!xfs_dqflock_nowait(dqp))
- xfs_dqflock_pushbuf_wait(dqp);
-
+ xfs_dqflock(dqp);
error = xfs_qm_dqflush(dqp, &bp);
if (error)
goto out_unlock;
- xfs_buf_delwri_queue(bp);
+ xfs_buf_delwri_queue(bp, buffer_list);
xfs_buf_relse(bp);
out_unlock:
xfs_dqunlock(dqp);
size_t structsz;
xfs_inode_t *uip, *gip;
uint flags;
+ LIST_HEAD (buffer_list);
count = INT_MAX;
structsz = 1;
*/
uip = mp->m_quotainfo->qi_uquotaip;
if (uip) {
- error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA);
+ error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
+ &buffer_list);
if (error)
goto error_return;
flags |= XFS_UQUOTA_CHKD;
gip = mp->m_quotainfo->qi_gquotaip;
if (gip) {
error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
- XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
+ XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA,
+ &buffer_list);
if (error)
goto error_return;
flags |= XFS_OQUOTA_CHKD;
* We've made all the changes that we need to make incore. Flush them
* down to disk buffers if everything was updated successfully.
*/
- if (XFS_IS_UQUOTA_ON(mp))
- error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one);
+ if (XFS_IS_UQUOTA_ON(mp)) {
+ error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
+ &buffer_list);
+ }
if (XFS_IS_GQUOTA_ON(mp)) {
- error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one);
+ error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
+ &buffer_list);
if (!error)
error = error2;
}
if (XFS_IS_PQUOTA_ON(mp)) {
- error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one);
+ error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
+ &buffer_list);
if (!error)
error = error2;
}
+ error2 = xfs_buf_delwri_submit(&buffer_list);
+ if (!error)
+ error = error2;
+
/*
* We can get this error if we couldn't do a dquot allocation inside
* xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
goto error_return;
}
- /*
- * We didn't log anything, because if we crashed, we'll have to
- * start the quotacheck from scratch anyway. However, we must make
- * sure that our dquot changes are secure before we put the
- * quotacheck'd stamp on the superblock. So, here we do a synchronous
- * flush.
- */
- xfs_flush_buftarg(mp->m_ddev_targp, 1);
-
/*
* If one type of quotas is off, then it will lose its
* quotachecked status, since we won't be doing accounting for
mp->m_qflags |= flags;
error_return:
+ while (!list_empty(&buffer_list)) {
+ struct xfs_buf *bp =
+ list_first_entry(&buffer_list, struct xfs_buf, b_list);
+ list_del_init(&bp->b_list);
+ xfs_buf_relse(bp);
+ }
+
if (error) {
xfs_warn(mp,
"Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
STATIC void
xfs_qm_dqreclaim_one(
struct xfs_dquot *dqp,
+ struct list_head *buffer_list,
struct list_head *dispose_list)
{
struct xfs_mount *mp = dqp->q_mount;
if (!xfs_dqflock_nowait(dqp))
goto out_busy;
- /*
- * We have the flush lock so we know that this is not in the
- * process of being flushed. So, if this is dirty, flush it
- * DELWRI so that we don't get a freelist infested with
- * dirty dquots.
- */
if (XFS_DQ_IS_DIRTY(dqp)) {
struct xfs_buf *bp = NULL;
trace_xfs_dqreclaim_dirty(dqp);
- /*
- * We flush it delayed write, so don't bother releasing the
- * freelist lock.
- */
error = xfs_qm_dqflush(dqp, &bp);
if (error) {
xfs_warn(mp, "%s: dquot %p flush failed",
goto out_busy;
}
- xfs_buf_delwri_queue(bp);
+ xfs_buf_delwri_queue(bp, buffer_list);
xfs_buf_relse(bp);
/*
* Give the dquot another try on the freelist, as the
struct xfs_quotainfo *qi =
container_of(shrink, struct xfs_quotainfo, qi_shrinker);
int nr_to_scan = sc->nr_to_scan;
+ LIST_HEAD (buffer_list);
LIST_HEAD (dispose_list);
struct xfs_dquot *dqp;
+ int error;
if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
return 0;
break;
dqp = list_first_entry(&qi->qi_lru_list, struct xfs_dquot,
q_lru);
- xfs_qm_dqreclaim_one(dqp, &dispose_list);
+ xfs_qm_dqreclaim_one(dqp, &buffer_list, &dispose_list);
}
mutex_unlock(&qi->qi_lru_lock);
+ error = xfs_buf_delwri_submit(&buffer_list);
+ if (error)
+ xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
+
while (!list_empty(&dispose_list)) {
dqp = list_first_entry(&dispose_list, struct xfs_dquot, q_lru);
list_del_init(&dqp->q_lru);
xfs_qm_dqfree_one(dqp);
}
+
out:
return (qi->qi_lru_count / 100) * sysctl_vfs_cache_pressure;
}
{
struct xfs_mount *mp = XFS_M(sb);
- /*
- * Blow away any referenced inode in the filestreams cache.
- * This can and will cause log traffic as inodes go inactive
- * here.
- */
xfs_filestream_unmount(mp);
-
- xfs_flush_buftarg(mp->m_ddev_targp, 1);
-
xfs_unmountfs(mp);
xfs_syncd_stop(mp);
xfs_freesb(mp);
return -error;
out_unmount:
- /*
- * Blow away any referenced inode in the filestreams cache.
- * This can and will cause log traffic as inodes go inactive
- * here.
- */
xfs_filestream_unmount(mp);
-
- xfs_flush_buftarg(mp->m_ddev_targp, 1);
-
xfs_unmountfs(mp);
xfs_syncd_stop(mp);
goto out_free_sb;
/* write superblock and hoover up shutdown errors */
error = xfs_sync_fsdata(mp);
- /* make sure all delwri buffers are written out */
- xfs_flush_buftarg(mp->m_ddev_targp, 1);
-
/* mark the log as covered if needed */
if (xfs_log_need_covered(mp))
error2 = xfs_fs_log_dummy(mp);
- /* flush data-only devices */
- if (mp->m_rtdev_targp)
- xfs_flush_buftarg(mp->m_rtdev_targp, 1);
-
return error ? error : error2;
}
if (!xfs_iflock_nowait(ip)) {
if (!(sync_mode & SYNC_WAIT))
goto out;
-
- /*
- * If we only have a single dirty inode in a cluster there is
- * a fair chance that the AIL push may have pushed it into
- * the buffer, but xfsbufd won't touch it until 30 seconds
- * from now, and thus we will lock up here.
- *
- * Promote the inode buffer to the front of the delwri list
- * and wake up xfsbufd now.
- */
- xfs_promote_inode(ip);
xfs_iflock(ip);
}
DEFINE_BUF_EVENT(xfs_buf_iowait);
DEFINE_BUF_EVENT(xfs_buf_iowait_done);
DEFINE_BUF_EVENT(xfs_buf_delwri_queue);
-DEFINE_BUF_EVENT(xfs_buf_delwri_dequeue);
+DEFINE_BUF_EVENT(xfs_buf_delwri_queued);
DEFINE_BUF_EVENT(xfs_buf_delwri_split);
DEFINE_BUF_EVENT(xfs_buf_get_uncached);
DEFINE_BUF_EVENT(xfs_bdstrat_shut);
DEFINE_BUF_ITEM_EVENT(xfs_buf_item_pin);
DEFINE_BUF_ITEM_EVENT(xfs_buf_item_unpin);
DEFINE_BUF_ITEM_EVENT(xfs_buf_item_unpin_stale);
-DEFINE_BUF_ITEM_EVENT(xfs_buf_item_trylock);
DEFINE_BUF_ITEM_EVENT(xfs_buf_item_unlock);
DEFINE_BUF_ITEM_EVENT(xfs_buf_item_unlock_stale);
DEFINE_BUF_ITEM_EVENT(xfs_buf_item_committed);
DEFINE_BUF_ITEM_EVENT(xfs_buf_item_push);
-DEFINE_BUF_ITEM_EVENT(xfs_buf_item_pushbuf);
DEFINE_BUF_ITEM_EVENT(xfs_trans_get_buf);
DEFINE_BUF_ITEM_EVENT(xfs_trans_get_buf_recur);
DEFINE_BUF_ITEM_EVENT(xfs_trans_getsb);
TP_PROTO(struct xfs_log_item *lip), \
TP_ARGS(lip))
DEFINE_LOG_ITEM_EVENT(xfs_ail_push);
-DEFINE_LOG_ITEM_EVENT(xfs_ail_pushbuf);
-DEFINE_LOG_ITEM_EVENT(xfs_ail_pushbuf_pinned);
DEFINE_LOG_ITEM_EVENT(xfs_ail_pinned);
DEFINE_LOG_ITEM_EVENT(xfs_ail_locked);
+DEFINE_LOG_ITEM_EVENT(xfs_ail_flushing);
DECLARE_EVENT_CLASS(xfs_file_class,
void (*iop_format)(xfs_log_item_t *, struct xfs_log_iovec *);
void (*iop_pin)(xfs_log_item_t *);
void (*iop_unpin)(xfs_log_item_t *, int remove);
- uint (*iop_trylock)(xfs_log_item_t *);
+ uint (*iop_push)(struct xfs_log_item *, struct list_head *);
void (*iop_unlock)(xfs_log_item_t *);
xfs_lsn_t (*iop_committed)(xfs_log_item_t *, xfs_lsn_t);
- void (*iop_push)(xfs_log_item_t *);
- bool (*iop_pushbuf)(xfs_log_item_t *);
void (*iop_committing)(xfs_log_item_t *, xfs_lsn_t);
};
#define IOP_FORMAT(ip,vp) (*(ip)->li_ops->iop_format)(ip, vp)
#define IOP_PIN(ip) (*(ip)->li_ops->iop_pin)(ip)
#define IOP_UNPIN(ip, remove) (*(ip)->li_ops->iop_unpin)(ip, remove)
-#define IOP_TRYLOCK(ip) (*(ip)->li_ops->iop_trylock)(ip)
+#define IOP_PUSH(ip, list) (*(ip)->li_ops->iop_push)(ip, list)
#define IOP_UNLOCK(ip) (*(ip)->li_ops->iop_unlock)(ip)
#define IOP_COMMITTED(ip, lsn) (*(ip)->li_ops->iop_committed)(ip, lsn)
-#define IOP_PUSH(ip) (*(ip)->li_ops->iop_push)(ip)
-#define IOP_PUSHBUF(ip) (*(ip)->li_ops->iop_pushbuf)(ip)
#define IOP_COMMITTING(ip, lsn) (*(ip)->li_ops->iop_committing)(ip, lsn)
/*
- * Return values for the IOP_TRYLOCK() routines.
+ * Return values for the IOP_PUSH() routines.
*/
-#define XFS_ITEM_SUCCESS 0
-#define XFS_ITEM_PINNED 1
-#define XFS_ITEM_LOCKED 2
-#define XFS_ITEM_PUSHBUF 3
+#define XFS_ITEM_SUCCESS 0
+#define XFS_ITEM_PINNED 1
+#define XFS_ITEM_LOCKED 2
+#define XFS_ITEM_FLUSHING 3
/*
* This is the type of function which can be given to xfs_trans_callback()
xfs_log_item_t *lip;
xfs_lsn_t lsn;
xfs_lsn_t target;
- long tout = 10;
+ long tout;
int stuck = 0;
+ int flushing = 0;
int count = 0;
- int push_xfsbufd = 0;
/*
- * If last time we ran we encountered pinned items, force the log first
- * and wait for it before pushing again.
+ * If we encountered pinned items or did not finish writing out all
+ * buffers the last time we ran, force the log first and wait for it
+ * before pushing again.
*/
- spin_lock(&ailp->xa_lock);
- if (ailp->xa_last_pushed_lsn == 0 && ailp->xa_log_flush &&
- !list_empty(&ailp->xa_ail)) {
+ if (ailp->xa_log_flush && ailp->xa_last_pushed_lsn == 0 &&
+ (!list_empty_careful(&ailp->xa_buf_list) ||
+ xfs_ail_min_lsn(ailp))) {
ailp->xa_log_flush = 0;
- spin_unlock(&ailp->xa_lock);
+
XFS_STATS_INC(xs_push_ail_flush);
xfs_log_force(mp, XFS_LOG_SYNC);
- spin_lock(&ailp->xa_lock);
}
+ spin_lock(&ailp->xa_lock);
lip = xfs_trans_ail_cursor_first(ailp, &cur, ailp->xa_last_pushed_lsn);
if (!lip) {
/*
- * AIL is empty or our push has reached the end.
+ * If the AIL is empty or our push has reached the end we are
+ * done now.
*/
xfs_trans_ail_cursor_done(ailp, &cur);
spin_unlock(&ailp->xa_lock);
XFS_STATS_INC(xs_push_ail);
- /*
- * While the item we are looking at is below the given threshold
- * try to flush it out. We'd like not to stop until we've at least
- * tried to push on everything in the AIL with an LSN less than
- * the given threshold.
- *
- * However, we will stop after a certain number of pushes and wait
- * for a reduced timeout to fire before pushing further. This
- * prevents use from spinning when we can't do anything or there is
- * lots of contention on the AIL lists.
- */
lsn = lip->li_lsn;
target = ailp->xa_target;
while ((XFS_LSN_CMP(lip->li_lsn, target) <= 0)) {
int lock_result;
+
/*
- * If we can lock the item without sleeping, unlock the AIL
- * lock and flush the item. Then re-grab the AIL lock so we
- * can look for the next item on the AIL. List changes are
- * handled by the AIL lookup functions internally
- *
- * If we can't lock the item, either its holder will flush it
- * or it is already being flushed or it is being relogged. In
- * any of these case it is being taken care of and we can just
- * skip to the next item in the list.
+ * Note that IOP_PUSH may unlock and reacquire the AIL lock. We
+ * rely on the AIL cursor implementation to be able to deal with
+ * the dropped lock.
*/
- lock_result = IOP_TRYLOCK(lip);
- spin_unlock(&ailp->xa_lock);
+ lock_result = IOP_PUSH(lip, &ailp->xa_buf_list);
switch (lock_result) {
case XFS_ITEM_SUCCESS:
XFS_STATS_INC(xs_push_ail_success);
trace_xfs_ail_push(lip);
- IOP_PUSH(lip);
ailp->xa_last_pushed_lsn = lsn;
break;
- case XFS_ITEM_PUSHBUF:
- XFS_STATS_INC(xs_push_ail_pushbuf);
- trace_xfs_ail_pushbuf(lip);
-
- if (!IOP_PUSHBUF(lip)) {
- trace_xfs_ail_pushbuf_pinned(lip);
- stuck++;
- ailp->xa_log_flush++;
- } else {
- ailp->xa_last_pushed_lsn = lsn;
- }
- push_xfsbufd = 1;
+ case XFS_ITEM_FLUSHING:
+ /*
+ * The item or its backing buffer is already beeing
+ * flushed. The typical reason for that is that an
+ * inode buffer is locked because we already pushed the
+ * updates to it as part of inode clustering.
+ *
+ * We do not want to to stop flushing just because lots
+ * of items are already beeing flushed, but we need to
+ * re-try the flushing relatively soon if most of the
+ * AIL is beeing flushed.
+ */
+ XFS_STATS_INC(xs_push_ail_flushing);
+ trace_xfs_ail_flushing(lip);
+
+ flushing++;
+ ailp->xa_last_pushed_lsn = lsn;
break;
case XFS_ITEM_PINNED:
stuck++;
ailp->xa_log_flush++;
break;
-
case XFS_ITEM_LOCKED:
XFS_STATS_INC(xs_push_ail_locked);
trace_xfs_ail_locked(lip);
+
stuck++;
break;
-
default:
ASSERT(0);
break;
}
- spin_lock(&ailp->xa_lock);
count++;
/*
* Are there too many items we can't do anything with?
+ *
* If we we are skipping too many items because we can't flush
* them or they are already being flushed, we back off and
* given them time to complete whatever operation is being
xfs_trans_ail_cursor_done(ailp, &cur);
spin_unlock(&ailp->xa_lock);
- if (push_xfsbufd) {
- /* we've got delayed write buffers to flush */
- wake_up_process(mp->m_ddev_targp->bt_task);
- }
+ if (xfs_buf_delwri_submit_nowait(&ailp->xa_buf_list))
+ ailp->xa_log_flush++;
- /* assume we have more work to do in a short while */
+ if (!count || XFS_LSN_CMP(lsn, target) >= 0) {
out_done:
- if (!count) {
- /* We're past our target or empty, so idle */
- ailp->xa_last_pushed_lsn = 0;
- ailp->xa_log_flush = 0;
-
- tout = 50;
- } else if (XFS_LSN_CMP(lsn, target) >= 0) {
/*
- * We reached the target so wait a bit longer for I/O to
- * complete and remove pushed items from the AIL before we
- * start the next scan from the start of the AIL.
+ * We reached the target or the AIL is empty, so wait a bit
+ * longer for I/O to complete and remove pushed items from the
+ * AIL before we start the next scan from the start of the AIL.
*/
tout = 50;
ailp->xa_last_pushed_lsn = 0;
- } else if ((stuck * 100) / count > 90) {
+ } else if (((stuck + flushing) * 100) / count > 90) {
/*
- * Either there is a lot of contention on the AIL or we
- * are stuck due to operations in progress. "Stuck" in this
- * case is defined as >90% of the items we tried to push
- * were stuck.
+ * Either there is a lot of contention on the AIL or we are
+ * stuck due to operations in progress. "Stuck" in this case
+ * is defined as >90% of the items we tried to push were stuck.
*
* Backoff a bit more to allow some I/O to complete before
- * restarting from the start of the AIL. This prevents us
- * from spinning on the same items, and if they are pinned will
- * all the restart to issue a log force to unpin the stuck
- * items.
+ * restarting from the start of the AIL. This prevents us from
+ * spinning on the same items, and if they are pinned will all
+ * the restart to issue a log force to unpin the stuck items.
*/
tout = 20;
ailp->xa_last_pushed_lsn = 0;
+ } else {
+ /*
+ * Assume we have more work to do in a short while.
+ */
+ tout = 10;
}
return tout;
struct xfs_ail *ailp = data;
long tout = 0; /* milliseconds */
+ current->flags |= PF_MEMALLOC;
+
while (!kthread_should_stop()) {
if (tout && tout <= 20)
__set_current_state(TASK_KILLABLE);
INIT_LIST_HEAD(&ailp->xa_ail);
INIT_LIST_HEAD(&ailp->xa_cursors);
spin_lock_init(&ailp->xa_lock);
+ INIT_LIST_HEAD(&ailp->xa_buf_list);
init_waitqueue_head(&ailp->xa_empty);
ailp->xa_task = kthread_run(xfsaild, ailp, "xfsaild/%s",
XFS_BUF_DONE(bp);
}
- /*
- * If the buffer is stale then it was binval'ed
- * since last read. This doesn't matter since the
- * caller isn't allowed to use the data anyway.
- */
- else if (XFS_BUF_ISSTALE(bp))
- ASSERT(!XFS_BUF_ISDELAYWRITE(bp));
-
ASSERT(bp->b_transp == tp);
bip = bp->b_fspriv;
ASSERT(bip != NULL);
return 0;
shutdown_abort:
- /*
- * the theory here is that buffer is good but we're
- * bailing out because the filesystem is being forcibly
- * shut down. So we should leave the b_flags alone since
- * the buffer's not staled and just get out.
- */
-#if defined(DEBUG)
- if (XFS_BUF_ISSTALE(bp) && XFS_BUF_ISDELAYWRITE(bp))
- xfs_notice(mp, "about to pop assert, bp == 0x%p", bp);
-#endif
- ASSERT((bp->b_flags & (XBF_STALE|XBF_DELWRI)) !=
- (XBF_STALE|XBF_DELWRI));
-
trace_xfs_trans_read_buf_shut(bp, _RET_IP_);
xfs_buf_relse(bp);
*bpp = NULL;
/*
- * This called to invalidate a buffer that is being used within
- * a transaction. Typically this is because the blocks in the
- * buffer are being freed, so we need to prevent it from being
- * written out when we're done. Allowing it to be written again
- * might overwrite data in the free blocks if they are reallocated
- * to a file.
+ * Invalidate a buffer that is being used within a transaction.
+ *
+ * Typically this is because the blocks in the buffer are being freed, so we
+ * need to prevent it from being written out when we're done. Allowing it
+ * to be written again might overwrite data in the free blocks if they are
+ * reallocated to a file.
*
- * We prevent the buffer from being written out by clearing the
- * B_DELWRI flag. We can't always
- * get rid of the buf log item at this point, though, because
- * the buffer may still be pinned by another transaction. If that
- * is the case, then we'll wait until the buffer is committed to
- * disk for the last time (we can tell by the ref count) and
- * free it in xfs_buf_item_unpin(). Until it is cleaned up we
- * will keep the buffer locked so that the buffer and buf log item
- * are not reused.
+ * We prevent the buffer from being written out by marking it stale. We can't
+ * get rid of the buf log item at this point because the buffer may still be
+ * pinned by another transaction. If that is the case, then we'll wait until
+ * the buffer is committed to disk for the last time (we can tell by the ref
+ * count) and free it in xfs_buf_item_unpin(). Until that happens we will
+ * keep the buffer locked so that the buffer and buf log item are not reused.
+ *
+ * We also set the XFS_BLF_CANCEL flag in the buf log format structure and log
+ * the buf item. This will be used at recovery time to determine that copies
+ * of the buffer in the log before this should not be replayed.
+ *
+ * We mark the item descriptor and the transaction dirty so that we'll hold
+ * the buffer until after the commit.
+ *
+ * Since we're invalidating the buffer, we also clear the state about which
+ * parts of the buffer have been logged. We also clear the flag indicating
+ * that this is an inode buffer since the data in the buffer will no longer
+ * be valid.
+ *
+ * We set the stale bit in the buffer as well since we're getting rid of it.
*/
void
xfs_trans_binval(
* If the buffer is already invalidated, then
* just return.
*/
- ASSERT(!(XFS_BUF_ISDELAYWRITE(bp)));
ASSERT(XFS_BUF_ISSTALE(bp));
ASSERT(!(bip->bli_flags & (XFS_BLI_LOGGED | XFS_BLI_DIRTY)));
ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_INODE_BUF));
return;
}
- /*
- * Clear the dirty bit in the buffer and set the STALE flag
- * in the buf log item. The STALE flag will be used in
- * xfs_buf_item_unpin() to determine if it should clean up
- * when the last reference to the buf item is given up.
- * We set the XFS_BLF_CANCEL flag in the buf log format structure
- * and log the buf item. This will be used at recovery time
- * to determine that copies of the buffer in the log before
- * this should not be replayed.
- * We mark the item descriptor and the transaction dirty so
- * that we'll hold the buffer until after the commit.
- *
- * Since we're invalidating the buffer, we also clear the state
- * about which parts of the buffer have been logged. We also
- * clear the flag indicating that this is an inode buffer since
- * the data in the buffer will no longer be valid.
- *
- * We set the stale bit in the buffer as well since we're getting
- * rid of it.
- */
xfs_buf_stale(bp);
+
bip->bli_flags |= XFS_BLI_STALE;
bip->bli_flags &= ~(XFS_BLI_INODE_BUF | XFS_BLI_LOGGED | XFS_BLI_DIRTY);
bip->bli_format.blf_flags &= ~XFS_BLF_INODE_BUF;
spinlock_t xa_lock;
xfs_lsn_t xa_last_pushed_lsn;
int xa_log_flush;
+ struct list_head xa_buf_list;
wait_queue_head_t xa_empty;
};
projects / users / willy / pagecache.git / commitdiff