Filesystems with 128-byte inodes do not support timestamps beyond the
year 2038. Since we're now less than 16.5 years away from that point,
it's time to start warning users about this lack of support when they
format an ext4 filesystem with small inodes.
(Note that even for ext2 and ext3, we changed the default for
non-small file systems in 2008 in commit commit
b1631cce648e ("Create
new filesystems with 256-byte inodes by default").)
So change the mke2fs.conf file to specify 256-byte inodes even for
small filesystems, and then add a warning to mke2fs itself if someone
is trying to make us format a file system with 128-byte inodes. This
can be suppressed by setting the boolean option warn_y2038_dates in
the mke2fs.conf file to false, which we do in the case of GNU Hurd,
since it only supports 128 byte inodes as of this writing.
[ Patch reworked by tytso to only warn in the case of GNU Hurd, since
the default for ext2/ext3 was changed for all but small file systems
in 2008. ]
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
exit(1);
}
+ /*
+ * Warn the user that filesystems with 128-byte inodes will
+ * not work properly beyond 2038. This can be suppressed via
+ * a boolean in the mke2fs.conf file, and we will disable this
+ * warning for file systems created for the GNU Hurd.
+ */
+ if (inode_size == EXT2_GOOD_OLD_INODE_SIZE &&
+ get_bool_from_profile(fs_types, "warn_y2038_dates", 1))
+ printf(
+_("128-byte inodes cannot handle dates beyond 2038 and are deprecated\n"));
+
/* Make sure number of inodes specified will fit in 32 bits */
if (num_inodes == 0) {
unsigned long long n;
This relation specifies the (zero-padded) width of the field for the
huge file number.
.TP
+.I warn_y2038_dates
+This boolean relation specifies wheather mke2fs will issue a warning
+when creating a file system with 128 byte inodes (and so therefore will
+not support dates after January 19th, 2038). The default value is true,
+except for file systems created for the GNU Hurd since it only supports
+128-byte inodes.
+.TP
.I zero_hugefiles
This boolean relation specifies whether or not zero blocks will be
written to the hugefiles while
}
ext4 = {
features = has_journal,extent,huge_file,flex_bg,metadata_csum,64bit,dir_nlink,extra_isize
- inode_size = 256
}
small = {
blocksize = 1024
- inode_size = 128
inode_ratio = 4096
}
floppy = {
blocksize = 1024
- inode_size = 128
inode_ratio = 8192
}
big = {
hurd = {
blocksize = 4096
inode_size = 128
+ warn_y2038_dates = 0
}
../misc/tune2fs: Bad magic number in super-block while trying to open test.img
test.img contains a xfs file system labelled 'test_filsys'
*** mke2fs
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 16384 1k blocks and 4096 inodes
Superblock backups stored on blocks:
8193
../misc/tune2fs: Bad magic number in super-block while trying to open test.img
test.img contains a xfs file system labelled 'test_filsys'
*** mke2fs
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 16384 1k blocks and 4096 inodes
Superblock backups stored on blocks:
8193
mke2fs -F -O resize_inode -o Linux -b 1024 -g 1024 test.img 16384
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 16384 1k blocks and 4096 inodes
Superblock backups stored on blocks:
1025, 3073, 5121, 7169, 9217
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 1024 1k blocks and 128 inodes
Allocating group tables: \b\b\bdone
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 32768 2k blocks and 16384 inodes
Superblock backups stored on blocks:
16384
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 131072 1k blocks and 8192 inodes
Superblock backups stored on blocks:
1025, 3073, 5121, 7169, 9217, 25601, 27649, 50177, 82945, 128001
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 65536 1k blocks and 16384 inodes
Superblock backups stored on blocks:
8193, 24577, 40961, 57345
mke2fs -F -T ext4h -I 128 test.img 786432
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 786432 1k blocks and 98304 inodes
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409, 663553
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 131072 1k blocks and 32768 inodes
Superblock backups stored on blocks:
1025, 3073, 5121, 7169, 9217, 25601, 27649, 50177, 82945, 128001
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
test.img: Cannot create filesystem with requested number of inodes while setting up superblock
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 65536 4k blocks and 65536 inodes
Superblock backups stored on blocks:
32768
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 65536 1k blocks and 16384 inodes
Superblock backups stored on blocks:
8193, 16385, 24577, 32769, 40961, 49153, 57345
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 131072 1k blocks and 32768 inodes
Superblock backups stored on blocks:
1025, 3073, 5121, 7169, 9217, 25601, 27649, 50177, 82945, 128001
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 1024 1k blocks and 128 inodes
Allocating group tables: \b\b\bdone
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 65536 1k blocks and 16384 inodes
Superblock backups stored on blocks:
8193, 24577, 40961, 57345
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 131072 1k blocks and 32768 inodes
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729
mke2fs -q -F -o Linux -b 1024 -g 256 test.img 1024
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
resize2fs -p test.img 10000
Resizing the filesystem on test.img to 10000 (1k) blocks.
Begin pass 1 (max = 35)
mke2fs -q -F -O resize_inode -o Linux -b 1024 -g 1024 test.img 16384
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
resize2fs test.img 65536
Resizing the filesystem on test.img to 65536 (1k) blocks.
The filesystem on test.img is now 65536 (1k) blocks long.
Free inodes: 16129-16384
--------------------------------
mke2fs -q -F -O resize_inode -o Linux -b 1024 -g 1024 test.img 65536
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
resize2fs test.img 16384
Resizing the filesystem on test.img to 16384 (1k) blocks.
The filesystem on test.img is now 16384 (1k) blocks long.
tune2fs metadata_csum test
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 524288 1k blocks and 65536 inodes
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409
tune2fs test
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 786432 1k blocks and 98304 inodes
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409, 663553
tune2fs test
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 786432 1k blocks and 98304 inodes
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409, 663553
+128-byte inodes cannot handle dates beyond 2038 and are deprecated
Creating filesystem with 65536 1k blocks and 16384 inodes
Superblock backups stored on blocks:
8193, 24577, 40961, 57345