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       An  XFS  filesystem can reside on a regular disk partition
       or on a logical volume.  An XFS filesystem has up to three
       parts:  a data section, a log section, and a realtime sec­
       tion.  Using the default mkfs.xfs(8) options, the realtime
       section  is  absent,  and the log area is contained within
       the data section.  The log section can be either  separate
       from  the  data  section  or  contained  within  it.   The
       filesystem sections are divided into a certain  number  of
       blocks,  whose size is specified at mkfs.xfs time with the
       -b option.

       The data section  contains  all  the  filesystem  metadata
       (inodes, directories, indirect blocks) as well as the user
       file data for ordinary (non-realtime) files  and  the  log
       area if the log is internal to the data section.  The data
       section is divided into a  number  of  allocation  groups.
       The number and size of the allocation groups are chosen by
       mkfs.xfs so that there  is  normally  a  small  number  of
       equal-sized  groups.  The number of allocation groups con­
       trols the amount of  parallelism  available  in  file  and
       block allocation.  It should be increased from the default
       if there is sufficient memory  and  a  lot  of  allocation
       activity.   The  number of allocation groups should not be
       set very high, since this can cause large amounts  of  CPU
       time  to  be  used  by the filesystem, especially when the
       filesystem is nearly full.   More  allocation  groups  are
       added (of the original size) when xfs_growfs(8) is run.

       The  log  section  (or area, if it is internal to the data
       section) is used to store changes to  filesystem  metadata
       while  the  filesystem  is running until those changes are
       made to the data section.  It is written sequentially dur­
       ing  normal  operation  and  read only during mount.  When
       mounting a filesystem after a crash, the log  is  read  to
       complete  operations  that were in progress at the time of
       the crash.

       The realtime section is used to store the data of realtime
       files.   These  files  had  an  attribute  bit set through
       ioctl(2) after file creation, before any data was  written
       to  the file.  The realtime section is divided into a num­
       ber of extents of fixed size (specified at mkfs.xfs time).
       Each  file in the realtime section has an extent size that
       is a multiple of the realtime section extent size.

       Each allocation group contains  several  data  structures.
       The  first sector contains the superblock.  For allocation
       groups after the first, the superblock is just a copy  and
       is  not  updated  after  mkfs.xfs.  The next three sectors
       contain information for block and inode allocation  within
       the  allocation group.  Also contained within each alloca­


       Some functionality  specific  to  the  XFS  filesystem  is
       accessible  to  applications through the xfsctl(3) and by-
       handle (see open_by_handle(3)) interfaces.


       Refer to the mount(8) manual entry for descriptions of the
       individual XFS mount options.


       xfsctl(3),     mount(8),     mkfs.xfs(8),     xfs_info(8),
       xfs_admin(8), xfsdump(8), xfsrestore(8).


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