@@ -29,11 +29,6 @@ struct kmem_cache *xfs_buf_cache;
/*
* Locking orders
*
- * xfs_buf_ioacct_inc:
- * xfs_buf_ioacct_dec:
- * b_sema (caller holds)
- * b_lock
- *
* xfs_buf_stale:
* b_sema (caller holds)
* b_lock
@@ -81,51 +76,6 @@ xfs_buf_vmap_len(
return (bp->b_page_count * PAGE_SIZE);
}
-/*
- * Bump the I/O in flight count on the buftarg if we haven't yet done so for
- * this buffer. The count is incremented once per buffer (per hold cycle)
- * because the corresponding decrement is deferred to buffer release. Buffers
- * can undergo I/O multiple times in a hold-release cycle and per buffer I/O
- * tracking adds unnecessary overhead. This is used for sychronization purposes
- * with unmount (see xfs_buftarg_drain()), so all we really need is a count of
- * in-flight buffers.
- *
- * Buffers that are never released (e.g., superblock, iclog buffers) must set
- * the XBF_NO_IOACCT flag before I/O submission. Otherwise, the buftarg count
- * never reaches zero and unmount hangs indefinitely.
- */
-static inline void
-xfs_buf_ioacct_inc(
- struct xfs_buf *bp)
-{
- if (bp->b_flags & XBF_NO_IOACCT)
- return;
-
- ASSERT(bp->b_flags & XBF_ASYNC);
- spin_lock(&bp->b_lock);
- if (!(bp->b_state & XFS_BSTATE_IN_FLIGHT)) {
- bp->b_state |= XFS_BSTATE_IN_FLIGHT;
- percpu_counter_inc(&bp->b_target->bt_io_count);
- }
- spin_unlock(&bp->b_lock);
-}
-
-/*
- * Clear the in-flight state on a buffer about to be released to the LRU or
- * freed and unaccount from the buftarg.
- */
-static inline void
-__xfs_buf_ioacct_dec(
- struct xfs_buf *bp)
-{
- lockdep_assert_held(&bp->b_lock);
-
- if (bp->b_state & XFS_BSTATE_IN_FLIGHT) {
- bp->b_state &= ~XFS_BSTATE_IN_FLIGHT;
- percpu_counter_dec(&bp->b_target->bt_io_count);
- }
-}
-
/*
* When we mark a buffer stale, we remove the buffer from the LRU and clear the
* b_lru_ref count so that the buffer is freed immediately when the buffer
@@ -156,8 +106,6 @@ xfs_buf_stale(
* status now to preserve accounting consistency.
*/
spin_lock(&bp->b_lock);
- __xfs_buf_ioacct_dec(bp);
-
atomic_set(&bp->b_lru_ref, 0);
if (!(bp->b_state & XFS_BSTATE_DISPOSE) &&
(list_lru_del_obj(&bp->b_target->bt_lru, &bp->b_lru)))
@@ -946,6 +894,7 @@ xfs_buf_readahead_map(
bp->b_ops = ops;
bp->b_flags &= ~(XBF_WRITE | XBF_DONE);
bp->b_flags |= flags;
+ percpu_counter_inc(&target->bt_readahead_count);
xfs_buf_submit(bp);
}
@@ -1002,10 +951,12 @@ xfs_buf_get_uncached(
struct xfs_buf *bp;
DEFINE_SINGLE_BUF_MAP(map, XFS_BUF_DADDR_NULL, numblks);
+ /* there are currently no valid flags for xfs_buf_get_uncached */
+ ASSERT(flags == 0);
+
*bpp = NULL;
- /* flags might contain irrelevant bits, pass only what we care about */
- error = _xfs_buf_alloc(target, &map, 1, flags & XBF_NO_IOACCT, &bp);
+ error = _xfs_buf_alloc(target, &map, 1, flags, &bp);
if (error)
return error;
@@ -1059,7 +1010,6 @@ xfs_buf_rele_uncached(
spin_unlock(&bp->b_lock);
return;
}
- __xfs_buf_ioacct_dec(bp);
spin_unlock(&bp->b_lock);
xfs_buf_free(bp);
}
@@ -1078,19 +1028,11 @@ xfs_buf_rele_cached(
spin_lock(&bp->b_lock);
ASSERT(bp->b_hold >= 1);
if (bp->b_hold > 1) {
- /*
- * Drop the in-flight state if the buffer is already on the LRU
- * and it holds the only reference. This is racy because we
- * haven't acquired the pag lock, but the use of _XBF_IN_FLIGHT
- * ensures the decrement occurs only once per-buf.
- */
- if (--bp->b_hold == 1 && !list_empty(&bp->b_lru))
- __xfs_buf_ioacct_dec(bp);
+ bp->b_hold--;
goto out_unlock;
}
/* we are asked to drop the last reference */
- __xfs_buf_ioacct_dec(bp);
if (!(bp->b_flags & XBF_STALE) && atomic_read(&bp->b_lru_ref)) {
/*
* If the buffer is added to the LRU, keep the reference to the
@@ -1370,6 +1312,8 @@ __xfs_buf_ioend(
bp->b_ops->verify_read(bp);
if (!bp->b_error)
bp->b_flags |= XBF_DONE;
+ if (bp->b_flags & XBF_READ_AHEAD)
+ percpu_counter_dec(&bp->b_target->bt_readahead_count);
} else {
if (!bp->b_error) {
bp->b_flags &= ~XBF_WRITE_FAIL;
@@ -1658,9 +1602,6 @@ xfs_buf_submit(
*/
bp->b_error = 0;
- if (bp->b_flags & XBF_ASYNC)
- xfs_buf_ioacct_inc(bp);
-
if ((bp->b_flags & XBF_WRITE) && !xfs_buf_verify_write(bp)) {
xfs_force_shutdown(bp->b_mount, SHUTDOWN_CORRUPT_INCORE);
xfs_buf_ioend(bp);
@@ -1786,9 +1727,8 @@ xfs_buftarg_wait(
struct xfs_buftarg *btp)
{
/*
- * First wait on the buftarg I/O count for all in-flight buffers to be
- * released. This is critical as new buffers do not make the LRU until
- * they are released.
+ * First wait for all in-flight readahead buffers to be released. This is
+ 8 critical as new buffers do not make the LRU until they are released.
*
* Next, flush the buffer workqueue to ensure all completion processing
* has finished. Just waiting on buffer locks is not sufficient for
@@ -1797,7 +1737,7 @@ xfs_buftarg_wait(
* all reference counts have been dropped before we start walking the
* LRU list.
*/
- while (percpu_counter_sum(&btp->bt_io_count))
+ while (percpu_counter_sum(&btp->bt_readahead_count))
delay(100);
flush_workqueue(btp->bt_mount->m_buf_workqueue);
}
@@ -1914,8 +1854,8 @@ xfs_destroy_buftarg(
struct xfs_buftarg *btp)
{
shrinker_free(btp->bt_shrinker);
- ASSERT(percpu_counter_sum(&btp->bt_io_count) == 0);
- percpu_counter_destroy(&btp->bt_io_count);
+ ASSERT(percpu_counter_sum(&btp->bt_readahead_count) == 0);
+ percpu_counter_destroy(&btp->bt_readahead_count);
list_lru_destroy(&btp->bt_lru);
}
@@ -1969,7 +1909,7 @@ xfs_init_buftarg(
if (list_lru_init(&btp->bt_lru))
return -ENOMEM;
- if (percpu_counter_init(&btp->bt_io_count, 0, GFP_KERNEL))
+ if (percpu_counter_init(&btp->bt_readahead_count, 0, GFP_KERNEL))
goto out_destroy_lru;
btp->bt_shrinker =
@@ -1983,7 +1923,7 @@ xfs_init_buftarg(
return 0;
out_destroy_io_count:
- percpu_counter_destroy(&btp->bt_io_count);
+ percpu_counter_destroy(&btp->bt_readahead_count);
out_destroy_lru:
list_lru_destroy(&btp->bt_lru);
return -ENOMEM;
@@ -27,7 +27,6 @@ struct xfs_buf;
#define XBF_READ (1u << 0) /* buffer intended for reading from device */
#define XBF_WRITE (1u << 1) /* buffer intended for writing to device */
#define XBF_READ_AHEAD (1u << 2) /* asynchronous read-ahead */
-#define XBF_NO_IOACCT (1u << 3) /* bypass I/O accounting (non-LRU bufs) */
#define XBF_ASYNC (1u << 4) /* initiator will not wait for completion */
#define XBF_DONE (1u << 5) /* all pages in the buffer uptodate */
#define XBF_STALE (1u << 6) /* buffer has been staled, do not find it */
@@ -58,7 +57,6 @@ typedef unsigned int xfs_buf_flags_t;
{ XBF_READ, "READ" }, \
{ XBF_WRITE, "WRITE" }, \
{ XBF_READ_AHEAD, "READ_AHEAD" }, \
- { XBF_NO_IOACCT, "NO_IOACCT" }, \
{ XBF_ASYNC, "ASYNC" }, \
{ XBF_DONE, "DONE" }, \
{ XBF_STALE, "STALE" }, \
@@ -77,7 +75,6 @@ typedef unsigned int xfs_buf_flags_t;
* Internal state flags.
*/
#define XFS_BSTATE_DISPOSE (1 << 0) /* buffer being discarded */
-#define XFS_BSTATE_IN_FLIGHT (1 << 1) /* I/O in flight */
struct xfs_buf_cache {
struct rhashtable bc_hash;
@@ -116,7 +113,7 @@ struct xfs_buftarg {
struct shrinker *bt_shrinker;
struct list_lru bt_lru;
- struct percpu_counter bt_io_count;
+ struct percpu_counter bt_readahead_count;
struct ratelimit_state bt_ioerror_rl;
/* Atomic write unit values */
@@ -117,7 +117,7 @@ xmbuf_free(
struct xfs_buftarg *btp)
{
ASSERT(xfs_buftarg_is_mem(btp));
- ASSERT(percpu_counter_sum(&btp->bt_io_count) == 0);
+ ASSERT(percpu_counter_sum(&btp->bt_readahead_count) == 0);
trace_xmbuf_free(btp);
@@ -181,14 +181,11 @@ xfs_readsb(
/*
* Allocate a (locked) buffer to hold the superblock. This will be kept
- * around at all times to optimize access to the superblock. Therefore,
- * set XBF_NO_IOACCT to make sure it doesn't hold the buftarg count
- * elevated.
+ * around at all times to optimize access to the superblock.
*/
reread:
error = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR,
- BTOBB(sector_size), XBF_NO_IOACCT, &bp,
- buf_ops);
+ BTOBB(sector_size), 0, &bp, buf_ops);
if (error) {
if (loud)
xfs_warn(mp, "SB validate failed with error %d.", error);
@@ -1407,7 +1407,7 @@ xfs_rtmount_readsb(
/* m_blkbb_log is not set up yet */
error = xfs_buf_read_uncached(mp->m_rtdev_targp, XFS_RTSB_DADDR,
- mp->m_sb.sb_blocksize >> BBSHIFT, XBF_NO_IOACCT, &bp,
+ mp->m_sb.sb_blocksize >> BBSHIFT, 0, &bp,
&xfs_rtsb_buf_ops);
if (error) {
xfs_warn(mp, "rt sb validate failed with error %d.", error);
The buffer cache keeps a bt_io_count per-CPU counter to track all in-flight I/O, which is used to ensure no I/O is in flight when unmounting the file system. For most I/O we already keep track of inflight I/O at higher levels: - for synchronous I/O (xfs_buf_read/xfs_bwrite/xfs_buf_delwri_submit), the caller has a reference and waits for I/O completions using xfs_buf_iowait - for xfs_buf_delwri_submit_nowait the only caller (AIL writeback) tracks the log items that the buffer attached to This only leaves only xfs_buf_readahead_map as a submitter of asynchronous I/O that is not tracked by anything else. Replace the bt_io_count per-cpu counter with a more specific bt_readahead_count counter only tracking readahead I/O. This allows to simply increment it when submitting readahead I/O and decrementing it when it completed, and thus simplify xfs_buf_rele and remove the needed for the XBF_NO_IOACCT flags and the XFS_BSTATE_IN_FLIGHT buffer state. Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/xfs/xfs_buf.c | 90 ++++++++------------------------------------ fs/xfs/xfs_buf.h | 5 +-- fs/xfs/xfs_buf_mem.c | 2 +- fs/xfs/xfs_mount.c | 7 +--- fs/xfs/xfs_rtalloc.c | 2 +- 5 files changed, 20 insertions(+), 86 deletions(-)