forked from luck/tmp_suning_uos_patched
[XFS] Update XFS documentation.
Signed-off-by: Nathan Scott <nathans@sgi.com>
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Nathan Scott
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@ -19,15 +19,43 @@ Mount Options
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When mounting an XFS filesystem, the following options are accepted.
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biosize=size
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Sets the preferred buffered I/O size (default size is 64K).
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"size" must be expressed as the logarithm (base2) of the
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desired I/O size.
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Valid values for this option are 14 through 16, inclusive
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(i.e. 16K, 32K, and 64K bytes). On machines with a 4K
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pagesize, 13 (8K bytes) is also a valid size.
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The preferred buffered I/O size can also be altered on an
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individual file basis using the ioctl(2) system call.
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allocsize=size
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Sets the buffered I/O end-of-file preallocation size when
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doing delayed allocation writeout (default size is 64KiB).
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Valid values for this option are page size (typically 4KiB)
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through to 1GiB, inclusive, in power-of-2 increments.
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attr2/noattr2
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The options enable/disable (default is disabled for backward
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compatibility on-disk) an "opportunistic" improvement to be
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made in the way inline extended attributes are stored on-disk.
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When the new form is used for the first time (by setting or
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removing extended attributes) the on-disk superblock feature
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bit field will be updated to reflect this format being in use.
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barrier
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Enables the use of block layer write barriers for writes into
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the journal and unwritten extent conversion. This allows for
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drive level write caching to be enabled, for devices that
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support write barriers.
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dmapi
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Enable the DMAPI (Data Management API) event callouts.
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Use with the "mtpt" option.
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grpid/bsdgroups and nogrpid/sysvgroups
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These options define what group ID a newly created file gets.
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When grpid is set, it takes the group ID of the directory in
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which it is created; otherwise (the default) it takes the fsgid
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of the current process, unless the directory has the setgid bit
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set, in which case it takes the gid from the parent directory,
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and also gets the setgid bit set if it is a directory itself.
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ihashsize=value
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Sets the number of hash buckets available for hashing the
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in-memory inodes of the specified mount point. If a value
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of zero is used, the value selected by the default algorithm
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will be displayed in /proc/mounts.
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ikeep/noikeep
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When inode clusters are emptied of inodes, keep them around
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@ -35,12 +63,31 @@ When mounting an XFS filesystem, the following options are accepted.
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and is still the default for now. Using the noikeep option,
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inode clusters are returned to the free space pool.
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inode64
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Indicates that XFS is allowed to create inodes at any location
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in the filesystem, including those which will result in inode
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numbers occupying more than 32 bits of significance. This is
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provided for backwards compatibility, but causes problems for
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backup applications that cannot handle large inode numbers.
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largeio/nolargeio
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If "nolargeio" is specified, the optimal I/O reported in
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st_blksize by stat(2) will be as small as possible to allow user
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applications to avoid inefficient read/modify/write I/O.
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If "largeio" specified, a filesystem that has a "swidth" specified
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will return the "swidth" value (in bytes) in st_blksize. If the
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filesystem does not have a "swidth" specified but does specify
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an "allocsize" then "allocsize" (in bytes) will be returned
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instead.
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If neither of these two options are specified, then filesystem
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will behave as if "nolargeio" was specified.
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logbufs=value
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Set the number of in-memory log buffers. Valid numbers range
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from 2-8 inclusive.
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The default value is 8 buffers for filesystems with a
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blocksize of 64K, 4 buffers for filesystems with a blocksize
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of 32K, 3 buffers for filesystems with a blocksize of 16K
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blocksize of 64KiB, 4 buffers for filesystems with a blocksize
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of 32KiB, 3 buffers for filesystems with a blocksize of 16KiB
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and 2 buffers for all other configurations. Increasing the
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number of buffers may increase performance on some workloads
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at the cost of the memory used for the additional log buffers
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@ -49,10 +96,10 @@ When mounting an XFS filesystem, the following options are accepted.
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logbsize=value
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Set the size of each in-memory log buffer.
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Size may be specified in bytes, or in kilobytes with a "k" suffix.
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Valid sizes for version 1 and version 2 logs are 16384 (16k) and
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32768 (32k). Valid sizes for version 2 logs also include
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Valid sizes for version 1 and version 2 logs are 16384 (16k) and
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32768 (32k). Valid sizes for version 2 logs also include
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65536 (64k), 131072 (128k) and 262144 (256k).
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The default value for machines with more than 32MB of memory
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The default value for machines with more than 32MiB of memory
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is 32768, machines with less memory use 16384 by default.
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logdev=device and rtdev=device
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@ -62,6 +109,11 @@ When mounting an XFS filesystem, the following options are accepted.
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optional, and the log section can be separate from the data
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section or contained within it.
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mtpt=mountpoint
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Use with the "dmapi" option. The value specified here will be
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included in the DMAPI mount event, and should be the path of
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the actual mountpoint that is used.
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noalign
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Data allocations will not be aligned at stripe unit boundaries.
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@ -91,13 +143,17 @@ When mounting an XFS filesystem, the following options are accepted.
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O_SYNC writes can be lost if the system crashes.
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If timestamp updates are critical, use the osyncisosync option.
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quota/usrquota/uqnoenforce
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uquota/usrquota/uqnoenforce/quota
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User disk quota accounting enabled, and limits (optionally)
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enforced.
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enforced. Refer to xfs_quota(8) for further details.
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grpquota/gqnoenforce
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gquota/grpquota/gqnoenforce
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Group disk quota accounting enabled and limits (optionally)
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enforced.
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enforced. Refer to xfs_quota(8) for further details.
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pquota/prjquota/pqnoenforce
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Project disk quota accounting enabled and limits (optionally)
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enforced. Refer to xfs_quota(8) for further details.
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sunit=value and swidth=value
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Used to specify the stripe unit and width for a RAID device or
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@ -113,15 +169,21 @@ When mounting an XFS filesystem, the following options are accepted.
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The "swidth" option is required if the "sunit" option has been
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specified, and must be a multiple of the "sunit" value.
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swalloc
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Data allocations will be rounded up to stripe width boundaries
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when the current end of file is being extended and the file
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size is larger than the stripe width size.
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sysctls
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=======
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The following sysctls are available for the XFS filesystem:
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fs.xfs.stats_clear (Min: 0 Default: 0 Max: 1)
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Setting this to "1" clears accumulated XFS statistics
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Setting this to "1" clears accumulated XFS statistics
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in /proc/fs/xfs/stat. It then immediately resets to "0".
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fs.xfs.xfssyncd_centisecs (Min: 100 Default: 3000 Max: 720000)
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The interval at which the xfssyncd thread flushes metadata
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out to disk. This thread will flush log activity out, and
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@ -143,9 +205,9 @@ The following sysctls are available for the XFS filesystem:
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XFS_ERRLEVEL_HIGH: 5
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fs.xfs.panic_mask (Min: 0 Default: 0 Max: 127)
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Causes certain error conditions to call BUG(). Value is a bitmask;
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Causes certain error conditions to call BUG(). Value is a bitmask;
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AND together the tags which represent errors which should cause panics:
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XFS_NO_PTAG 0
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XFS_PTAG_IFLUSH 0x00000001
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XFS_PTAG_LOGRES 0x00000002
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@ -155,7 +217,7 @@ The following sysctls are available for the XFS filesystem:
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XFS_PTAG_SHUTDOWN_IOERROR 0x00000020
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XFS_PTAG_SHUTDOWN_LOGERROR 0x00000040
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This option is intended for debugging only.
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This option is intended for debugging only.
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fs.xfs.irix_symlink_mode (Min: 0 Default: 0 Max: 1)
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Controls whether symlinks are created with mode 0777 (default)
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@ -164,25 +226,37 @@ The following sysctls are available for the XFS filesystem:
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fs.xfs.irix_sgid_inherit (Min: 0 Default: 0 Max: 1)
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Controls files created in SGID directories.
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If the group ID of the new file does not match the effective group
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ID or one of the supplementary group IDs of the parent dir, the
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ISGID bit is cleared if the irix_sgid_inherit compatibility sysctl
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ID or one of the supplementary group IDs of the parent dir, the
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ISGID bit is cleared if the irix_sgid_inherit compatibility sysctl
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is set.
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fs.xfs.restrict_chown (Min: 0 Default: 1 Max: 1)
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Controls whether unprivileged users can use chown to "give away"
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a file to another user.
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fs.xfs.inherit_sync (Min: 0 Default: 1 Max 1)
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Setting this to "1" will cause the "sync" flag set
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by the chattr(1) command on a directory to be
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fs.xfs.inherit_sync (Min: 0 Default: 1 Max: 1)
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Setting this to "1" will cause the "sync" flag set
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by the xfs_io(8) chattr command on a directory to be
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inherited by files in that directory.
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fs.xfs.inherit_nodump (Min: 0 Default: 1 Max 1)
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Setting this to "1" will cause the "nodump" flag set
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by the chattr(1) command on a directory to be
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fs.xfs.inherit_nodump (Min: 0 Default: 1 Max: 1)
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Setting this to "1" will cause the "nodump" flag set
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by the xfs_io(8) chattr command on a directory to be
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inherited by files in that directory.
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fs.xfs.inherit_noatime (Min: 0 Default: 1 Max 1)
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Setting this to "1" will cause the "noatime" flag set
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by the chattr(1) command on a directory to be
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fs.xfs.inherit_noatime (Min: 0 Default: 1 Max: 1)
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Setting this to "1" will cause the "noatime" flag set
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by the xfs_io(8) chattr command on a directory to be
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inherited by files in that directory.
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fs.xfs.inherit_nosymlinks (Min: 0 Default: 1 Max: 1)
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Setting this to "1" will cause the "nosymlinks" flag set
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by the xfs_io(8) chattr command on a directory to be
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inherited by files in that directory.
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fs.xfs.rotorstep (Min: 1 Default: 1 Max: 256)
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In "inode32" allocation mode, this option determines how many
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files the allocator attempts to allocate in the same allocation
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group before moving to the next allocation group. The intent
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is to control the rate at which the allocator moves between
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allocation groups when allocating extents for new files.
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