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btrfs-progs: add fd version of device_get_partition_size

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The helper wraps a raw ioctl but some users may already have the fd and
not necessarily the path. Add a suitable helper for convenience.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2021-04-29 20:13:49 +02:00
parent 6a78c16e98
commit f6c30640bc
2 changed files with 11 additions and 0 deletions
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10
common/device-utils.c
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@ -288,6 +288,16 @@ u64 btrfs_device_size(int fd, struct stat *st)
/*
* Read partition size using the low-level ioctl
*/
u64 device_get_partition_size_fd(int fd)
{
u64 result;
if (ioctl(fd, BLKGETSIZE64, &result) < 0)
return 0;
return result;
}
u64 device_get_partition_size(const char *dev)
{
u64 result;

1
common/device-utils.h
View File

@ -34,6 +34,7 @@
int device_discard_blocks(int fd, u64 start, u64 len);
int device_zero_blocks(int fd, off_t start, size_t len);
u64 device_get_partition_size(const char *dev);
u64 device_get_partition_size_fd(int fd);
int device_get_queue_param(const char *file, const char *param, char *buf, size_t len);
/*