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aio: store event at final iocb_put() 

Instead of having aio_complete() set ->ki_res.{res,res2}, do that
explicitly in its callers, drop the reference (as aio_complete()
used to do) and delay the rest until the final iocb_put().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-03-07 19:49:55 -05:00
parent a9339b7855
commit 2bb874c0d8
1 changed files with 17 additions and 16 deletions
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33
fs/aio.c
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@ -1077,16 +1077,10 @@ static inline void iocb_destroy(struct aio_kiocb *iocb)
kmem_cache_free(kiocb_cachep, iocb);
}
static inline void iocb_put(struct aio_kiocb *iocb)
{
if (refcount_dec_and_test(&iocb->ki_refcnt))
iocb_destroy(iocb);
}
/* aio_complete
* Called when the io request on the given iocb is complete.
*/
static void aio_complete(struct aio_kiocb *iocb, long res, long res2)
static void aio_complete(struct aio_kiocb *iocb)
{
struct kioctx *ctx = iocb->ki_ctx;
struct aio_ring *ring;
@ -1094,8 +1088,6 @@ static void aio_complete(struct aio_kiocb *iocb, long res, long res2)
unsigned tail, pos, head;
unsigned long flags;
iocb->ki_res.res = res;
iocb->ki_res.res2 = res2;
/*
* Add a completion event to the ring buffer. Must be done holding
* ctx->completion_lock to prevent other code from messing with the tail
@ -1161,7 +1153,14 @@ static void aio_complete(struct aio_kiocb *iocb, long res, long res2)
if (waitqueue_active(&ctx->wait))
wake_up(&ctx->wait);
iocb_put(iocb);
}
static inline void iocb_put(struct aio_kiocb *iocb)
{
if (refcount_dec_and_test(&iocb->ki_refcnt)) {
aio_complete(iocb);
iocb_destroy(iocb);
}
}
/* aio_read_events_ring
@ -1435,7 +1434,9 @@ static void aio_complete_rw(struct kiocb *kiocb, long res, long res2)
file_end_write(kiocb->ki_filp);
}
aio_complete(iocb, res, res2);
iocb->ki_res.res = res;
iocb->ki_res.res2 = res2;
iocb_put(iocb);
}
static int aio_prep_rw(struct kiocb *req, const struct iocb *iocb)
@ -1583,11 +1584,10 @@ static ssize_t aio_write(struct kiocb *req, const struct iocb *iocb,
static void aio_fsync_work(struct work_struct *work)
{
struct fsync_iocb *req = container_of(work, struct fsync_iocb, work);
int ret;
struct aio_kiocb *iocb = container_of(work, struct aio_kiocb, fsync.work);
ret = vfs_fsync(req->file, req->datasync);
aio_complete(container_of(req, struct aio_kiocb, fsync), ret, 0);
iocb->ki_res.res = vfs_fsync(iocb->fsync.file, iocb->fsync.datasync);
iocb_put(iocb);
}
static int aio_fsync(struct fsync_iocb *req, const struct iocb *iocb,
@ -1608,7 +1608,8 @@ static int aio_fsync(struct fsync_iocb *req, const struct iocb *iocb,
static inline void aio_poll_complete(struct aio_kiocb *iocb, __poll_t mask)
{
aio_complete(iocb, mangle_poll(mask), 0);
iocb->ki_res.res = mangle_poll(mask);
iocb_put(iocb);
}
static void aio_poll_complete_work(struct work_struct *work)