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device: use BLKPBSZGET for physical block size only if the op is available, otherwise use logical block size

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Older kernels < 2.6.32 don't have BLKPBSZGET defined.
This commit is contained in:
Peter Rajnoha 2013-12-17 15:16:25 +01:00
parent 24639be558
commit 3652083f38
1 changed files with 16 additions and 9 deletions
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25
lib/device/dev-io.c
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@ -136,15 +136,6 @@ int dev_get_block_size(struct device *dev, unsigned int *physical_block_size, un
if (needs_open && !dev_open_readonly(dev))
return_0;
if (dev->phys_block_size == -1) {
if (ioctl(dev_fd(dev), BLKPBSZGET, &dev->phys_block_size) < 0) {
log_sys_error("ioctl BLKPBSZGET", name);
r = 0;
goto out;
}
log_debug_devs("%s: physical block size is %u bytes", name, dev->phys_block_size);
}
if (dev->block_size == -1) {
if (ioctl(dev_fd(dev), BLKBSZGET, &dev->block_size) < 0) {
log_sys_error("ioctl BLKBSZGET", name);
@ -154,6 +145,22 @@ int dev_get_block_size(struct device *dev, unsigned int *physical_block_size, un
log_debug_devs("%s: block size is %u bytes", name, dev->block_size);
}
#ifdef BLKPBSZGET
/* BLKPBSZGET is available in kernel >= 2.6.32 only */
if (dev->phys_block_size == -1) {
if (ioctl(dev_fd(dev), BLKPBSZGET, &dev->phys_block_size) < 0) {
log_sys_error("ioctl BLKPBSZGET", name);
r = 0;
goto out;
}
log_debug_devs("%s: physical block size is %u bytes", name, dev->phys_block_size);
}
#else
/* if we can't get physical block size, just use logical block size instead */
dev->phys_block_size = dev->block_size;
log_debug_devs("%s: physical block size can't be determined, using logical "
"block size of %u bytes instead", name, dev->phys_block_size);
#endif
*physical_block_size = (unsigned int) dev->phys_block_size;
*block_size = (unsigned int) dev->block_size;
out: