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devs: use bcache fd for read ahead ioctl

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to avoid an unnecessary open of the device in
most cases.
This commit is contained in:
David Teigland 2018-06-26 12:05:39 -05:00
parent 90e419c645
commit f7ffba204e
1 changed files with 12 additions and 6 deletions
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18
lib/device/dev-io.c
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@ -367,18 +367,24 @@ static int _dev_get_size_dev(struct device *dev, uint64_t *size)
static int _dev_read_ahead_dev(struct device *dev, uint32_t *read_ahead)
{
long read_ahead_long;
int fd = dev->bcache_fd;
int do_close = 0;
if (dev->read_ahead != -1) {
*read_ahead = (uint32_t) dev->read_ahead;
return 1;
}
if (!dev_open_readonly(dev))
return_0;
if (fd <= 0) {
if (!dev_open_readonly(dev))
return_0;
fd = dev_fd(dev);
do_close = 1;
}
if (ioctl(dev->fd, BLKRAGET, &read_ahead_long) < 0) {
if (ioctl(fd, BLKRAGET, &read_ahead_long) < 0) {
log_sys_error("ioctl BLKRAGET", dev_name(dev));
if (!dev_close_immediate(dev))
if (do_close && !dev_close_immediate(dev))
stack;
return 0;
}
@ -389,8 +395,8 @@ static int _dev_read_ahead_dev(struct device *dev, uint32_t *read_ahead)
log_very_verbose("%s: read_ahead is %u sectors",
dev_name(dev), *read_ahead);
if (!dev_close_immediate(dev))
stack;
if (do_close && !dev_close_immediate(dev))
log_sys_error("close", dev_name(dev));
return 1;
}