xfs_bmap
8
<2>extent<1><7>: [<1><2>startoffset<1><7>..<1><2>endoffset<1><7>]: c <1><2>startblock<1><7>..<1><2>endblock<1> Holes are marked by replacing the <2>startblock..endblock<1> with <2>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 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 <3>-d<1> option is used, no DMAPI read event will be generated for a DMAPI file and offline portions will be reported as holes. If the <3>-l<1> option is used, then <1><2><nblocks><1><7> <1><2>blocks<1><7> will be appended to each line. <1><2>Nblocks<1><7> is the length of the extent described on the line in units of 512-byte blocks. If the <3>-a<1> option is given, information about the file's attribute fork is printed instead of the default data fork. If the <3>-n <2>nnn<1> option is given, <3>xfs_bmap<1> obtains the extent list of the file in groups of <2>nnn<1> extents. In the absence of <3>-n<1>, <3>xfs_bmap<1> queries the system for the number of extents in the file and uses that value to compute the group size.
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