misc: add text describing the impact of an inode size < 128 bytes in man pages

Addresses-Debian-Bug: #953493
Addresses-Debian-Bug: #953494
Addresses-Debian-Bug: #951808
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/misc/mke2fs.8.in b/misc/mke2fs.8.in
index 5bcee25..e6bfc6d 100644 (file)
--- a/misc/mke2fs.8.in
+++ b/misc/mke2fs.8.in
@@ -484,13 +484,10 @@ space in the filesystem and can also negatively impact performance.
 It is not
 possible to change this value after the filesystem is created.
 .IP
-In kernels after 2.6.10 and some
-earlier vendor kernels it is possible to utilize inodes larger than
-128 bytes to store
-extended attributes for improved performance.
-Extended attributes
-stored in large inodes are not visible with older kernels, and such
-filesystems will not be mountable with 2.4 kernels at all.
+File systems with an inode size of 128 bytes do not support timestamps
+beyond January 19, 2038.  Inodes which are 256 bytes or larger will
+support extended timestamps, project id's, and the ability to store some
+extended attributes in the inode table for improved performance.
 .IP
 The default inode size is controlled by the
 .BR mke2fs.conf (5)

diff --git a/misc/tune2fs.8.in b/misc/tune2fs.8.in
index 74eebb6..3cf1f5e 100644 (file)
--- a/misc/tune2fs.8.in
+++ b/misc/tune2fs.8.in
@@ -299,7 +299,13 @@ consistency first using
 .BR e2fsck (8).
 This operation can also take a while and the file system can be
 corrupted and data lost if it is interrupted while in the middle of
-converting the file system.
+converting the file system.  Backing up the file system before changing
+inode size is recommended.
+.IP
+File systems with an inode size of 128 bytes do not support timestamps
+beyond January 19, 2038.  Inodes which are 256 bytes or larger will
+support extended timestamps, project id's, and the ability to store some
+extended attributes in the inode table for improved performance.
 .TP
 .B \-j
 Add an ext3 journal to the filesystem.  If the