Messages in this thread | | | Date | Sun, 01 Apr 2001 03:19:37 +0200 | From | Xuan Baldauf <> | Subject | [BUG] smbfs: caching problems |
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Hello,
there is something wrong with smbfs caching which makes my applications fail. The behaviour happens with linux-2.4.3-pre4 and linux-2.4.3-final.
Consider following shell script: (where /mnt/n is a smbmounted smb share from a Win98SE box)
router|/mnt/n/temp/smbfs> I=0; while test $I -lt 127; do echo "abc" >>/tmp/test.abc; I=$((I+1)); done # create a 508 bytes file router|/mnt/n/temp/smbfs> I=0; while test $I -lt 129; do echo "xyz" >>/tmp/test.xyz; I=$((I+1)); done # create a 516 bytes file router|/mnt/n/temp/smbfs> while true; do cp /tmp/test.abc testfile; tail -1 testfile; cp /tmp/test.xyz testfile; tail -1 testfile; done # copy the files alternatingly and read the destination file after it has bean overwritten abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc [...Ctrl-C...] router|/mnt/n/temp/smbfs> cd /tmp # the same on reiserfs router|/tmp> while true; do cp /tmp/test.abc testfile; tail -1 testfile; cp /tmp/test.xyz testfile; tail -1 testfile; done # here it works abc xyz abc xyz abc xyz abc xyz abc xyz abc xyz abc xyz abc xyz abc xyz abc xyz abc xyz abc xyz abc xyz abc [...Ctrl-C...] router|/tmp> uname -a Linux router 2.4.3 #5 Fri Mar 30 14:02:24 CEST 2001 i586 unknown router|/tmp>
Obviously, the smbfs behaviour is wrong. Interstingly, the change in the filesize of the file overwritten seems to need to cross a 512-block-boundary in order to show the bug.
Contact me if you need more info.
Xuân.
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