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fuse: Introduce fuse_{inc,dec}_in_flight()

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This is how vduse-blk.c does it, and it does seem better to have
dedicated functions for it.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
Message-ID: <20260309150856.26800-11-hreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Hanna Czenczek
2026-03-09 16:08:41 +01:00
committed by Kevin Wolf
parent 4a8527e836
commit 7e38c36558
1 changed files with 21 additions and 8 deletions
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29
block/export/fuse.c
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@@ -78,6 +78,25 @@ static void read_from_fuse_export(void *opaque);
static bool is_regular_file(const char *path, Error **errp);
static void fuse_inc_in_flight(FuseExport *exp)
{
if (qatomic_fetch_inc(&exp->in_flight) == 0) {
/* Prevent export from being deleted */
blk_exp_ref(&exp->common);
}
}
static void fuse_dec_in_flight(FuseExport *exp)
{
if (qatomic_fetch_dec(&exp->in_flight) == 1) {
/* Wake AIO_WAIT_WHILE() */
aio_wait_kick();
/* Now the export can be deleted */
blk_exp_unref(&exp->common);
}
}
static void fuse_attach_handlers(FuseExport *exp)
{
aio_set_fd_handler(exp->common.ctx,
@@ -303,9 +322,7 @@ static void read_from_fuse_export(void *opaque)
FuseExport *exp = opaque;
int ret;
blk_exp_ref(&exp->common);
qatomic_inc(&exp->in_flight);
fuse_inc_in_flight(exp);
do {
ret = fuse_session_receive_buf(exp->fuse_session, &exp->fuse_buf);
@@ -323,11 +340,7 @@ static void read_from_fuse_export(void *opaque)
fuse_session_process_buf(exp->fuse_session, &exp->fuse_buf);
out:
if (qatomic_fetch_dec(&exp->in_flight) == 1) {
aio_wait_kick(); /* wake AIO_WAIT_WHILE() */
}
blk_exp_unref(&exp->common);
fuse_dec_in_flight(exp);
}
static void fuse_export_shutdown(BlockExport *blk_exp)