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[3/4] ext4.5: document the stable_inodes feature

Message ID 20200401203239.163679-4-ebiggers@kernel.org
State Accepted
Headers show
Series e2fsprogs: fix and document the stable_inodes feature | expand

Commit Message

Eric Biggers April 1, 2020, 8:32 p.m. UTC
From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
 misc/ext4.5.in | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
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diff --git a/misc/ext4.5.in b/misc/ext4.5.in
index 1db61a5f..90bc4f88 100644
--- a/misc/ext4.5.in
+++ b/misc/ext4.5.in
@@ -299,6 +299,20 @@  feature is essentially a more extreme version of sparse_super and is
 designed to allow a much larger percentage of the disk to have
 contiguous blocks available for data files.
+.B stable_inodes
+Marks the filesystem's inode numbers and UUID as stable.
+.BR resize2fs (8)
+will not allow shrinking a filesystem with this feature, nor
+.BR tune2fs (8)
+allow changing its UUID.  This feature allows the use of specialized encryption
+settings that make use of the inode numbers and UUID.  Note that the
+.B encrypt
+feature still needs to be enabled separately.
+.B stable_inodes
+is a "compat" feature, so old kernels will allow it.
 .B uninit_bg
 This ext4 file system feature indicates that the block group descriptors
@@ -788,6 +802,8 @@  ext4, 4.13
 ext4, 5.2
 .IP "\fBverity\fR" 2i
 ext4, 5.4
+.IP "\fBstable_inodes\fR" 2i
+ext4, 5.5
 .BR mke2fs (8),
 .BR mke2fs.conf (5),