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SubjectWhat is the difference between 'login: root' and 'su -' ?
Hello,
tried today to mkfs.ext2 a partition of my disk and detected there is
a little difference between 'login: root' and 'su -'.

First I tried it this way:

Welcome to SuSE Linux 7.0 (i386) - Kernel 2.4.14 (tty1).

zodiak login: seiderer
Password:
seiderer@zodiak:~ > su -
Password:
zodiak:~ #
zodiak:~ # mkfs.ext2 /dev/hdc4
mke2fs 1.18, 11-Nov-1999 for EXT2 FS 0.5b, 95/08/09
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
716672 inodes, 1432116 blocks
71605 blocks (5.00%) reserved for the super user
First data block=0
44 block groups
32768 blocks per group, 32768 fragments per group
16288 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736

Writing inode tables: 16/44File size limit exceeded

strace showed that write returned wit EFBIG and the process ended with SIGXFSZ:

write(1, "\10\10\10\10\10", 5) = 5
write(1, "16/44", 5) = 5
_llseek(4, 18446744071562084352, [2147500032], SEEK_SET) = 0
write(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 32768) = -1 EFBIG (File too large)
--- SIGXFSZ (File size limit exceeded) ---
+++ killed by SIGXFSZ +++

When login in directly from the console as root everything went right:
Welcome to SuSE Linux 7.0 (i386) - Kernel 2.4.14 (tty1).

zodiak login: root
Password:
zodiak:~ # mkfs.ext2 /dev/hdc4
mke2fs 1.18, 11-Nov-1999 for EXT2 FS 0.5b, 95/08/09
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
716672 inodes, 1432116 blocks
71605 blocks (5.00%) reserved for the super user
First data block=0
44 block groups
32768 blocks per group, 32768 fragments per group
16288 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736

Writing inode tables: done
Writing superblocks and filesystem accounting information: done
zodiak:~ #

The RLIMIT_FSIZE showed in both cases the same values:
getrlimit(RLIMIT_FSIZE) rlim_cur: 2147483647 rlim_max: 2147483647

Can anybody point me out what went wrong? Is it a kernel limit?

Peter

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