forked from Mirrors/btrfs-progs
btrfs-progs: add mount options to btrfs-mount.5
This is a straight cut and paste from the util-linux mount manpage into btrfs-mount.5 It's pretty much impossible for util-linux to keep up with every filesystem out there, and Karel has more than once expressed a wish that mount options move into fs-specific manpages. So, here we go. The way btrfs asciidoc is generated, there's not a trivial way to have both btrfs(5) and btrfs(8) so I named it btrfs-mount(5) for now. A bit ick and I'm open to suggestions. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: David Sterba <dsterba@suse.cz>master
parent
8559a1626f
commit
26341f734d
|
@ -31,13 +31,21 @@ MAN8_TXT += btrfs-replace.txt
|
|||
MAN8_TXT += btrfs-restore.txt
|
||||
MAN8_TXT += btrfs-property.txt
|
||||
|
||||
MAN_TXT = $(MAN8_TXT)
|
||||
# Mount manpage
|
||||
MAN5_TXT += btrfs-mount.txt
|
||||
|
||||
MAN_TXT = $(MAN8_TXT) $(MAN5_TXT)
|
||||
MAN_XML = $(patsubst %.txt,%.xml,$(MAN_TXT))
|
||||
|
||||
DOC_MAN5 = $(patsubst %.txt,%.5,$(MAN5_TXT))
|
||||
GZ_MAN5 = $(patsubst %.txt,%.5.gz,$(MAN5_TXT))
|
||||
|
||||
DOC_MAN8 = $(patsubst %.txt,%.8,$(MAN8_TXT))
|
||||
GZ_MAN8 = $(patsubst %.txt,%.8.gz,$(MAN8_TXT))
|
||||
|
||||
mandir ?= $(prefix)/share/man
|
||||
man8dir = $(mandir)/man8
|
||||
man5dir = $(mandir)/man5
|
||||
|
||||
ASCIIDOC = asciidoc
|
||||
ASCIIDOC_EXTRA =
|
||||
|
@ -67,25 +75,36 @@ endif
|
|||
endif
|
||||
|
||||
all: man
|
||||
man: man8
|
||||
man: man5 man8
|
||||
man5: $(GZ_MAN5)
|
||||
man8: $(GZ_MAN8)
|
||||
|
||||
install: install-man
|
||||
|
||||
install-man: man
|
||||
$(INSTALL) -d -m 755 $(DESTDIR)$(man5dir)
|
||||
$(INSTALL) -d -m 755 $(DESTDIR)$(man8dir)
|
||||
$(INSTALL) -m 644 $(GZ_MAN5) $(DESTDIR)$(man5dir)
|
||||
$(INSTALL) -m 644 $(GZ_MAN8) $(DESTDIR)$(man8dir)
|
||||
$(LNS) btrfs-check.8.gz $(DESTDIR)$(man8dir)/btrfsck.8.gz
|
||||
|
||||
clean:
|
||||
$(QUIET_RM)$(RM) *.xml *.xml+ *.8 *.8.gz
|
||||
$(QUIET_RM)$(RM) *.xml *.xml+ *.5 *.5.gz *.8 *.8.gz
|
||||
|
||||
%.5.gz : %.5
|
||||
$(QUIET_GZIP)$(GZIPCMD) -n -c $< > $@
|
||||
|
||||
%.8.gz : %.8
|
||||
$(QUIET_GZIP)$(GZIPCMD) -n -c $< > $@
|
||||
|
||||
%.5 : %.xml
|
||||
$(QUIET_XMLTO)$(RM) $@ && \
|
||||
$(XMLTO) -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $<
|
||||
|
||||
%.8 : %.xml
|
||||
$(QUIET_XMLTO)$(RM) $@ && \
|
||||
$(XMLTO) -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $<
|
||||
|
||||
%.xml : %.txt asciidoc.conf
|
||||
$(QUIET_ASCIIDOC)$(RM) $@.tmp[12] $@ && \
|
||||
sed -e "s/\(<[^>]\+>\)/'\1'/g" < $< > $@.tmp1 && \
|
||||
|
|
|
@ -0,0 +1,186 @@
|
|||
btrfs-mount(5)
|
||||
==============
|
||||
|
||||
NAME
|
||||
----
|
||||
btrfs-mount - mount options for the btrfs filesystem
|
||||
|
||||
DESCRIPTION
|
||||
-----------
|
||||
This document describes mount options specific to the btrfs filesystem.
|
||||
Other generic mount options are available,and are described in the
|
||||
`mount`(8) manpage.
|
||||
|
||||
MOUNT OPTIONS
|
||||
-------------
|
||||
*alloc_start='bytes'*::
|
||||
Debugging option to force all block allocations above a certain
|
||||
byte threshold on each block device. The value is specified in
|
||||
bytes, optionally with a K, M, or G suffix, case insensitive.
|
||||
Default is 1MB.
|
||||
|
||||
*autodefrag*::
|
||||
Disable/enable auto defragmentation.
|
||||
Auto defragmentation detects small random writes into files and queue
|
||||
them up for the defrag process. Works best for small files;
|
||||
Not well suited for large database workloads.
|
||||
|
||||
*check_int*|*check_int_data*|*check_int_print_mask='value'*::
|
||||
These debugging options control the behavior of the integrity checking
|
||||
module (the BTRFS_FS_CHECK_INTEGRITY config option required). +
|
||||
+
|
||||
`check_int` enables the integrity checker module, which examines all
|
||||
block write requests to ensure on-disk consistency, at a large
|
||||
memory and CPU cost. +
|
||||
+
|
||||
`check_int_data` includes extent data in the integrity checks, and
|
||||
implies the check_int option. +
|
||||
+
|
||||
`check_int_print_mask` takes a bitmask of BTRFSIC_PRINT_MASK_* values
|
||||
as defined in 'fs/btrfs/check-integrity.c', to control the integrity
|
||||
checker module behavior. +
|
||||
+
|
||||
See comments at the top of 'fs/btrfs/check-integrity.c'
|
||||
for more info.
|
||||
|
||||
*commit='seconds'*::
|
||||
Set the interval of periodic commit, 30 seconds by default. Higher
|
||||
values defer data being synced to permanent storage with obvious
|
||||
consequences when the system crashes. The upper bound is not forced,
|
||||
but a warning is printed if it's more than 300 seconds (5 minutes).
|
||||
|
||||
*compress*|*compress='type'*|*compress-force*|*compress-force='type'*::
|
||||
Control BTRFS file data compression. Type may be specified as "zlib"
|
||||
"lzo" or "no" (for no compression, used for remounting). If no type
|
||||
is specified, zlib is used. If compress-force is specified,
|
||||
all files will be compressed, whether or not they compress well.
|
||||
If compression is enabled, nodatacow and nodatasum are disabled.
|
||||
|
||||
*degraded*::
|
||||
Allow mounts to continue with missing devices. A read-write mount may
|
||||
fail with too many devices missing, for example if a stripe member
|
||||
is completely missing.
|
||||
|
||||
*device='devicepath'*::
|
||||
Specify a device during mount so that ioctls on the control device
|
||||
can be avoided. Especially useful when trying to mount a multi-device
|
||||
setup as root. May be specified multiple times for multiple devices.
|
||||
|
||||
*discard*::
|
||||
Disable/enable discard mount option.
|
||||
Discard issues frequent commands to let the block device reclaim space
|
||||
freed by the filesystem.
|
||||
This is useful for SSD devices, thinly provisioned
|
||||
LUNs and virtual machine images, but may have a significant
|
||||
performance impact. (The fstrim command is also available to
|
||||
initiate batch trims from userspace).
|
||||
|
||||
*enospc_debug*::
|
||||
Disable/enable debugging option to be more verbose in some ENOSPC conditions.
|
||||
|
||||
*fatal_errors='action'*::
|
||||
Action to take when encountering a fatal error. +
|
||||
"bug" - BUG() on a fatal error. This is the default. +
|
||||
"panic" - panic() on a fatal error.
|
||||
|
||||
*flushoncommit*::
|
||||
The `flushoncommit` mount option forces any data dirtied by a write in a
|
||||
prior transaction to commit as part of the current commit. This makes
|
||||
the committed state a fully consistent view of the file system from the
|
||||
application's perspective (i.e., it includes all completed file system
|
||||
operations). This was previously the behavior only when a snapshot is
|
||||
created.
|
||||
|
||||
*inode_cache*:
|
||||
Enable free inode number caching. Defaults to off due to an overflow
|
||||
problem when the free space crcs don't fit inside a single page.
|
||||
|
||||
*max_inline='bytes'*::
|
||||
Specify the maximum amount of space, in bytes, that can be inlined in
|
||||
a metadata B-tree leaf. The value is specified in bytes, optionally
|
||||
with a K, M, or G suffix, case insensitive. In practice, this value
|
||||
is limited by the root sector size, with some space unavailable due
|
||||
to leaf headers. For a 4k sectorsize, max inline data is ~3900 bytes.
|
||||
|
||||
*metadata_ratio='value'*::
|
||||
Specify that 1 metadata chunk should be allocated after every
|
||||
'value' data chunks. Off by default.
|
||||
|
||||
*noacl*::
|
||||
Enable/disable support for Posix Access Control Lists (ACLs). See the
|
||||
`acl`(5) manual page for more information about ACLs.
|
||||
|
||||
*nobarrier*::
|
||||
ensure that certain IOs make it through the device cache and are on
|
||||
persistent storage. If disabled on a device with a volatile
|
||||
(non-battery-backed) write-back cache, nobarrier option will lead to
|
||||
filesystem corruption on a system crash or power loss.
|
||||
|
||||
*nodatacow*::
|
||||
Enable/disable data copy-on-write for newly created files.
|
||||
Nodatacow implies nodatasum, and disables all compression.
|
||||
|
||||
*nodatasum*::
|
||||
Enable/disable data checksumming for newly created files.
|
||||
Datasum implies datacow.
|
||||
|
||||
*notreelog*::
|
||||
Enable/disable the tree logging used for fsync and O_SYNC writes.
|
||||
|
||||
*recovery*::
|
||||
Enable autorecovery attempts if a bad tree root is found at mount time.
|
||||
Currently this scans a list of several previous tree roots and tries to
|
||||
use the first readable.
|
||||
|
||||
*rescan_uuid_tree*::
|
||||
Force check and rebuild procedure of the UUID tree. This should not
|
||||
normally be needed.
|
||||
|
||||
*skip_balance*::
|
||||
Skip automatic resume of interrupted balance operation after mount.
|
||||
May be resumed with "btrfs balance resume."
|
||||
|
||||
*nospace_cache*::
|
||||
Disable freespace cache loading without clearing the cache.
|
||||
|
||||
*clear_cache*::
|
||||
Force clearing and rebuilding of the disk space cache if something
|
||||
has gone wrong.
|
||||
|
||||
*ssd*|*nossd*|*ssd_spread*::
|
||||
Options to control ssd allocation schemes. By default, BTRFS will
|
||||
enable or disable ssd allocation heuristics depending on whether a
|
||||
rotational or nonrotational disk is in use. The ssd and nossd options
|
||||
can override this autodetection. +
|
||||
The ssd_spread mount option attempts to allocate into big chunks
|
||||
of unused space, and may perform better on low-end ssds. ssd_spread
|
||||
implies ssd, enabling all other ssd heuristics as well.
|
||||
|
||||
*subvol='path'*::
|
||||
Mount subvolume at 'path' rather than the root subvolume. The
|
||||
'path' is relative to the top level subvolume.
|
||||
|
||||
*subvolid='ID'*::
|
||||
Mount subvolume specified by an ID number rather than the root subvolume.
|
||||
This allows mounting of subvolumes which are not in the root of the mounted
|
||||
filesystem.
|
||||
You can use "btrfs subvolume list" to see subvolume ID numbers.
|
||||
|
||||
*subvolrootid='objectid' (deprecated)*::
|
||||
Mount subvolume specified by 'objectid' rather than the root subvolume.
|
||||
This allows mounting of subvolumes which are not in the root of the mounted
|
||||
filesystem.
|
||||
You can use "btrfs subvolume show" to see the object ID for a subvolume.
|
||||
|
||||
*thread_pool='number'*::
|
||||
The number of worker threads to allocate. The default number is equal
|
||||
to the number of CPUs + 2, or 8, whichever is smaller.
|
||||
|
||||
*user_subvol_rm_allowed*::
|
||||
Allow subvolumes to be deleted by a non-root user. Use with caution.
|
||||
|
||||
SEE ALSO
|
||||
--------
|
||||
`mkfs.btrfs`(8),
|
||||
`mount`(8),
|
||||
`btrfs`(8)
|
Loading…
Reference in New Issue