mirror of https://github.com/vitalif/e2fsprogs
321649c9f4
mke2fs -m option can set reserved blocks ratio up to 50%. But if the
last block group is not big enough to support the necessary data
structures, it gets dropped, we have to recalculate the number of
reserved blocks so that the reserved blocks matches the requested
percentage.
It also avoids a problem where if the user specifies a reserved blocks
of 50%, and after the last partial block group was dropped, if the
number of reserved blocks is greater than 50%, e2fsck will complain.
Steps to reproduce:
1. Create a FS which has the overhead for the last BG
and specify 50 % for reserved blocks ratio
# mke2fs -m 50 -t ext4 DEV 1025M
mke2fs 1.42.5 (29-Jul-2012)
warning: 256 blocks unused.
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
656640 inodes, 2621440 blocks
1310848 blocks (50.00%) reserved for the super user
~~~~~~~ <-- Reserved blocks exceed 50% of FS blocks count!
2. e2fsck outputs filesystem corruption
# e2fsck DEV
e2fsck 1.42.5 (29-Jul-2012)
Corruption found in superblock. (r_blocks_count = 1310848).
The superblock could not be read or does not describe a correct ext2
filesystem. If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 32768 <device>
Signed-off-by: Akira Fujita <a-fujita@rs.jp.ne.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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| config | ||
| contrib | ||
| debian | ||
| debugfs | ||
| doc | ||
| e2fsck | ||
| ext2ed | ||
| include/nonunix | ||
| install-utils | ||
| intl | ||
| lib | ||
| misc | ||
| po | ||
| resize | ||
| tests | ||
| util | ||
| .gitignore | ||
| .hgignore | ||
| .missing-copyright | ||
| .release-checklist | ||
| ABOUT-NLS | ||
| COPYING | ||
| INSTALL | ||
| INSTALL.elfbin | ||
| MCONFIG.in | ||
| Makefile.in | ||
| README | ||
| README.subset | ||
| RELEASE-NOTES | ||
| SHLIBS | ||
| SUBMITTING-PATCHES | ||
| TODO | ||
| aclocal.m4 | ||
| configure | ||
| configure.in | ||
| depfix.sed | ||
| e2fsprogs.lsm | ||
| e2fsprogs.spec.in | ||
| version.h | ||
| wordwrap.pl | ||
README
This is the new version (1.42.5) of the second extended file system management programs. From time to time, I release new versions of e2fsprogs, to fix bugs and to make the utilities more robust. You can always find information about the latest version at the the e2fsprogs web page, which is: http://e2fsprogs.sourceforge.net The INSTALL file has instructions on building and installing e2fsprogs. Provisions for building Red Hat RPMs and Debian dpkg files are supplied as well. In case of bugs in these programs, please contact Ted Ts'o at tytso@mit.edu or tytso@alum.mit.edu. See the e2fsck man page for suggestions of what sort of information to include when submitting bug reports for these programs.