forked from Mirrors/btrfs-progs
btrfs-progs: docs: update formatting and wording for btrfs(5)
- emphasize features in the list - minor whitespace fixes Signed-off-by: David Sterba <dsterba@suse.com>master
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da76d52947
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3ab900a04e
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@ -452,35 +452,36 @@ means the feature can be enabled.
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List of features (see also `mkfs.btrfs`(8) section 'FILESYSTEM FEATURES'):
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List of features (see also `mkfs.btrfs`(8) section 'FILESYSTEM FEATURES'):
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big_metadata::
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*big_metadata*::
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(since: 3.4)
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(since: 3.4)
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+
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+
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the filesystem uses 'nodesize' bigger than the page size
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the filesystem uses 'nodesize' for metadata blocks, this can be bigger than the
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page size
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compress_lzo::
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*compress_lzo*::
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(since: 2.6.38)
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(since: 2.6.38)
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+
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+
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the 'lzo' compression has been used on the filesystem, either as a mount option
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the 'lzo' compression has been used on the filesystem, either as a mount option
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or via *btrfs filesystem defrag*.
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or via *btrfs filesystem defrag*.
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default_subvol::
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*default_subvol*::
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(since: 2.6.34)
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(since: 2.6.34)
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+
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+
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the default subvolume has been set on the filesystem
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the default subvolume has been set on the filesystem
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extended_iref::
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*extended_iref*::
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(since: 3.7)
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(since: 3.7)
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+
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+
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increased hardlink limit per file in a directory to 65536, older kernels
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increased hardlink limit per file in a directory to 65536, older kernels
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supported a varying number of hardlinks depending on the sum of all file name
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supported a varying number of hardlinks depending on the sum of all file name
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sizes that can be stored into one metadata block
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sizes that can be stored into one metadata block
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mixed_backref::
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*mixed_backref*::
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(since: 2.6.31)
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(since: 2.6.31)
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+
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+
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the last major disk format change, improved backreferences
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the last major disk format change, improved backreferences, now default
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mixed_groups::
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*mixed_groups*::
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(since: 2.6.37)
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(since: 2.6.37)
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+
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+
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mixed data and metadata block groups, ie. the data and metadata are not
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mixed data and metadata block groups, ie. the data and metadata are not
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@ -492,17 +493,18 @@ and vice versa)
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on the other hand, the final layout is quite unpredictable and possibly highly
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on the other hand, the final layout is quite unpredictable and possibly highly
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fragmented, which means worse performance
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fragmented, which means worse performance
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no_holes::
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*no_holes*::
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(since: 3.14)
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(since: 3.14)
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+
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improved representation of file extents where holes are not explicitly
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improved representation of file extents where holes are not explicitly
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stored as an extent, saves a few percent of metadata if sparse files are used
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stored as an extent, saves a few percent of metadata if sparse files are used
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raid56::
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*raid56*::
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(since: 3.9)
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(since: 3.9)
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+
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+
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the filesystem contains or contained a raid56 profile of block groups
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the filesystem contains or contained a raid56 profile of block groups
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+
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skinny_metadata::
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*skinny_metadata*::
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(since: 3.10)
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(since: 3.10)
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+
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+
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reduced-size metadata for extent references, saves a few percent of metadata
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reduced-size metadata for extent references, saves a few percent of metadata
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@ -578,16 +580,16 @@ filesystem module:
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for a given filesystem
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for a given filesystem
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* get the supported features (can be also found under '/sys/fs/btrfs/features')
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* get the supported features (can be also found under '/sys/fs/btrfs/features')
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The device is usually created by a system device node manager (eg. udev), but
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The device is usually created by ..., but can be created manually:
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can be created manually:
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--------------------
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--------------------
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# mknod --mode=600 c 10 234 /dev/btrfs-control
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# mknod --mode=600 c 10 234 /dev/btrfs-control
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--------------------
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--------------------
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The device is not strictly required but the device scanning will not work and a
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The control device is not strictly required but the device scanning will not
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workaround would need to be used to mount a multi-device filesystem. The mount
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work and a workaround would need to be used to mount a multi-device filesystem.
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option 'device' can trigger the device scanning during mount.
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The mount option 'device' can trigger the device scanning during mount.
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SEE ALSO
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SEE ALSO
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--------
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--------
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