отображение блока печати для файла XFS (print block mapping for an XFS file)
Имя (Name)
xfs_bmap - print block mapping for an XFS file
Синопсис (Synopsis)
xfs_bmap [ -adelpv ] [ -n num_extents ] file
xfs_bmap -V
Описание (Description)
xfs_bmap prints the map of disk blocks used by files in an XFS
filesystem. The map lists each extent used by the file, as well
as regions in the file that do not have any corresponding blocks
(holes). Each line of the listings takes the following form:
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.
Параметры (Options)
-a If this option is specified, information about the file's
attribute fork is printed instead of the default data
fork.
-e 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.
-l If this option is used, then
<nblocks> blocks
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.
-p 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.
-v 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.
-V Prints the version number and exits.
Смотри также (See also)
xfs_fsr(8), xfs(5).
