diff options
Diffstat (limited to 'Documentation/btrfstune.asciidoc')
| -rw-r--r-- | Documentation/btrfstune.asciidoc | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/Documentation/btrfstune.asciidoc b/Documentation/btrfstune.asciidoc index 04295ee3..cd7bb532 100644 --- a/Documentation/btrfstune.asciidoc +++ b/Documentation/btrfstune.asciidoc @@ -7,7 +7,7 @@ btrfstune - tune various filesystem parameters SYNOPSIS -------- -*btrfstune* [options] <dev> [<dev>...] +*btrfstune* [options] <device> [<device>...] DESCRIPTION ----------- @@ -29,11 +29,13 @@ OPTIONS Enable seeding on a given device. Value 1 will enable seeding, 0 will disable it. + A seeding filesystem is forced to be mounted read-only. A new device can be added to the filesystem and will capture all writes keeping the seeding device intact. + -r:: (since kernel: 3.7) + Enable extended inode refs (hardlink limit per file in a directory is 65536), enabled by mkfs feature 'extref'. + -x:: (since kernel: 3.10) + @@ -43,17 +45,21 @@ enabled by mkfs feature 'skinny-metadata'. All newly created extents will use the new representation. To completely switch the entire filesystem, run a full balance of the metadata. Please refer to `btrfs-balance`(8). + -n:: (since kernel: 3.14) + Enable no-holes feature (more efficient representation of file holes), enabled by mkfs feature 'no-holes'. + -f:: Allow dangerous changes, e.g. clear the seeding flag or change fsid. Make sure that you are aware of the dangers. + -u:: Change fsid to a randomly generated UUID or continue previous fsid change operation in case it was interrupted. + -U <UUID>:: Change fsid to 'UUID'. + |