|xfs_bmap(8)||System Manager's Manual||xfs_bmap(8)|
extent: [startoffset..endoffset]: startblock..endblock
Holes are marked by replacing the startblock..endblock with hole. All the file offsets and disk blocks are in units of 512-byte blocks, no matter what the filesystem's block size is.
- If this option is specified, information about the file's attribute fork is printed instead of the default data fork.
- If portions of the file have been migrated offline by a DMAPI application, a DMAPI read event will be generated to bring those portions back online before the disk block map is printed. However if the -d option is used, no DMAPI read event will be generated for a DMAPI file and offline portions will be reported as holes.
- If this option is used, xfs_bmap obtains all delayed allocation extents, and does not flush dirty pages to disk before querying extent data. With the -v option, the flags column will show which extents have not yet been allocated.
- If this option is used, then
- will be appended to each line. nblocks is the length of the extent described on the line in units of 512-byte blocks.
- This flag has no effect if the -v option is used.
- -n num_extents
- If this option is given, xfs_bmap will display at most num_extents extents. In the absence of -n, xfs_bmap will display all extents in the file.
- If this option is used, xfs_bmap obtains all unwritten (preallocated) extents that do not contain written data. With the -v option, the flags column will show which extents are preallocated/unwritten.
- Shows verbose information. When this flag is specified, additional AG specific information is appended to each line in the following form:
agno (startagoffset..endagoffset) nblocks flags
- A second -v option will print out the flags legend.
- Prints the version number and exits.