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xfs: rename xfs_wait_buftarg() to xfs_buftarg_drain() 

xfs_wait_buftarg() is vaguely named and somewhat overloaded. Its
primary purpose is to reclaim all buffers from the provided buffer
target LRU. In preparation to refactor xfs_wait_buftarg() into
serialization and LRU draining components, rename the function and
associated helpers to something more descriptive. This patch has no
functional changes with the minor exception of renaming a
tracepoint.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Brian Foster 2021-01-22 16:48:19 -08:00 committed by Darrick J. Wong
parent 88a9e03bee
commit 10fb9ac125
5 changed files with 17 additions and 17 deletions
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12
fs/xfs/xfs_buf.c
View File

@ -43,7 +43,7 @@ static kmem_zone_t *xfs_buf_zone;
* pag_buf_lock
* lru_lock
*
* xfs_buftarg_wait_rele
* xfs_buftarg_drain_rele
* lru_lock
* b_lock (trylock due to inversion)
*
@ -88,7 +88,7 @@ xfs_buf_vmap_len(
* 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_wait_buftarg()), so all we really need is a count of
* 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
@ -1786,7 +1786,7 @@ __xfs_buf_mark_corrupt(
* while freeing all the buffers only held by the LRU.
*/
static enum lru_status
xfs_buftarg_wait_rele(
xfs_buftarg_drain_rele(
struct list_head *item,
struct list_lru_one *lru,
spinlock_t *lru_lock,
@ -1798,7 +1798,7 @@ xfs_buftarg_wait_rele(
if (atomic_read(&bp->b_hold) > 1) {
/* need to wait, so skip it this pass */
trace_xfs_buf_wait_buftarg(bp, _RET_IP_);
trace_xfs_buf_drain_buftarg(bp, _RET_IP_);
return LRU_SKIP;
}
if (!spin_trylock(&bp->b_lock))
@ -1816,7 +1816,7 @@ xfs_buftarg_wait_rele(
}
void
xfs_wait_buftarg(
xfs_buftarg_drain(
struct xfs_buftarg *btp)
{
LIST_HEAD(dispose);
@ -1841,7 +1841,7 @@ xfs_wait_buftarg(
/* loop until there is nothing left on the lru list. */
while (list_lru_count(&btp->bt_lru)) {
list_lru_walk(&btp->bt_lru, xfs_buftarg_wait_rele,
list_lru_walk(&btp->bt_lru, xfs_buftarg_drain_rele,
&dispose, LONG_MAX);
while (!list_empty(&dispose)) {

10
fs/xfs/xfs_buf.h
View File

@ -152,7 +152,7 @@ struct xfs_buf {
struct list_head b_list;
struct xfs_perag *b_pag; /* contains rbtree root */
struct xfs_mount *b_mount;
xfs_buftarg_t *b_target; /* buffer target (device) */
struct xfs_buftarg *b_target; /* buffer target (device) */
void *b_addr; /* virtual address of buffer */
struct work_struct b_ioend_work;
struct completion b_iowait; /* queue for I/O waiters */
@ -344,11 +344,11 @@ xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
/*
* Handling of buftargs.
*/
extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *,
struct block_device *, struct dax_device *);
extern struct xfs_buftarg *xfs_alloc_buftarg(struct xfs_mount *,
struct block_device *, struct dax_device *);
extern void xfs_free_buftarg(struct xfs_buftarg *);
extern void xfs_wait_buftarg(xfs_buftarg_t *);
extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int);
extern void xfs_buftarg_drain(struct xfs_buftarg *);
extern int xfs_setsize_buftarg(struct xfs_buftarg *, unsigned int);
#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)

6
fs/xfs/xfs_log.c
View File

@ -741,7 +741,7 @@ xfs_log_mount_finish(
xfs_log_force(mp, XFS_LOG_SYNC);
xfs_ail_push_all_sync(mp->m_ail);
}
xfs_wait_buftarg(mp->m_ddev_targp);
xfs_buftarg_drain(mp->m_ddev_targp);
if (readonly)
mp->m_flags |= XFS_MOUNT_RDONLY;
@ -936,13 +936,13 @@ xfs_log_quiesce(
/*
* The superblock buffer is uncached and while xfs_ail_push_all_sync()
* will push it, xfs_wait_buftarg() will not wait for it. Further,
* will push it, xfs_buftarg_drain() will not wait for it. Further,
* xfs_buf_iowait() cannot be used because it was pushed with the
* XBF_ASYNC flag set, so we need to use a lock/unlock pair to wait for
* the IO to complete.
*/
xfs_ail_push_all_sync(mp->m_ail);
xfs_wait_buftarg(mp->m_ddev_targp);
xfs_buftarg_drain(mp->m_ddev_targp);
xfs_buf_lock(mp->m_sb_bp);
xfs_buf_unlock(mp->m_sb_bp);

4
fs/xfs/xfs_mount.c
View File

@ -1023,8 +1023,8 @@ xfs_mountfs(
xfs_log_mount_cancel(mp);
out_fail_wait:
if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp)
xfs_wait_buftarg(mp->m_logdev_targp);
xfs_wait_buftarg(mp->m_ddev_targp);
xfs_buftarg_drain(mp->m_logdev_targp);
xfs_buftarg_drain(mp->m_ddev_targp);
out_free_perag:
xfs_free_perag(mp);
out_free_dir:

2
fs/xfs/xfs_trace.h
View File

@ -358,7 +358,7 @@ DEFINE_BUF_EVENT(xfs_buf_get_uncached);
DEFINE_BUF_EVENT(xfs_buf_item_relse);
DEFINE_BUF_EVENT(xfs_buf_iodone_async);
DEFINE_BUF_EVENT(xfs_buf_error_relse);
DEFINE_BUF_EVENT(xfs_buf_wait_buftarg);
DEFINE_BUF_EVENT(xfs_buf_drain_buftarg);
DEFINE_BUF_EVENT(xfs_trans_read_buf_shut);
/* not really buffer traces, but the buf provides useful information */