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e104825916
Add a call to create dmstats regions that correspond to the extents present in a file descriptor open on a file in a local file system. The file must reside on a file system type that correctly supports physical extent location data in the FIEMAP ioctl. Regions are optionally placed into a group with a user-defined alias. File systems that do not support physical offsets in FIEMAP (btrfs currently) are detected via fstatfs() - although attempting to map a --filemap group on btrfs will fail anyway with the generic error "Not on a device-mapper device" this is confusing; the file system mount is on a device-mapper device, but btrfs' volume layer masks this in the returned st_dev field since the returned logical file extents may span multiple physical devices.
2 lines
32 B
Plaintext
2 lines
32 B
Plaintext
dm_stats_create_regions_from_fd
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