Details
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Bug
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Resolution: Duplicate
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Minor
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None
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Lustre 2.3.0, Lustre 2.1.2
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# cat /proc/fs/lustre/version
lustre: 2.2.55
kernel: patchless_client
build: 2.2.55-gef32640-CHANGED-2.6.32-220.13.1.el6.l22.x86_64
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3
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6105
Description
Open-unlinked files can be read (depending on inode/process permissions) through the PENDING directory.
root]# w# cat /proc/fs/lustre/version lustre: 2.2.55 kernel: patchless_client build: 2.2.55-gef32640-CHANGED-2.6.32-220.13.1.el6.l22.x86_64 hoami root [root]# cd /mnt/lustre [root]# lsof /mnt/lustre COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME lsof 4392 root cwd DIR 1273,181606 376832 25003 /mnt/lustre lsof 4393 root cwd DIR 1273,181606 376832 25003 /mnt/lustre bash 20096 root cwd DIR 1273,181606 376832 25003 /mnt/lustre bash 21418 sanity cwd DIR 1273,181606 376832 25003 /mnt/lustre [root]# echo SEACREST > PASSWORD [root]# exec 3<PASSWORD [root]# rm -f PASSWORD [root]# lsof /mnt/lustre COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME lsof 4575 root cwd DIR 1273,181606 376832 25003 /mnt/lustre lsof 4576 root cwd DIR 1273,181606 376832 25003 /mnt/lustre bash 20096 root cwd DIR 1273,181606 376832 25003 /mnt/lustre bash 20096 root 3r REG 1273,181606 9 144115206094586102 /mnt/lustre/PASSWORD (dele\ ted) bash 21418 sanity cwd DIR 1273,181606 376832 25003 /mnt/lustre
sys_getdents is equivalent to `ls -ia' but prints d_type as well.
[sanity]$ whoami sanity [sanity]$ cd /mnt/lustre [sanity]$ sys_getdents -x . d 200000001000006 `.' d 20000000100000d `..' d 61ac `.lustre' [sanity]$ sys_getdents -x .lustre/fid/[0x200000001:0xd:0x0] | grep ^d d c `CONFIGS' d b000000 `lost+found' d 2000000 `.' d 61ab `ROOT' d 2000000 `..' d 61a9 `OBJECTS' d 61aa `PENDING' d e `NIDTBL_VERSIONS' [sanity]$ cd .lustre/fid/[0x200000001:0xd:0x0]/PENDING [sanity]$ sys_getdents -x . ## PENDING dirpages not cache coherent. d 200000001000007 `.' r 2000004320000a2 `0000000200000432:000000a2:00000000: 0' d 20000000100000d `..' [sanity]$ cat '0000000200000432:000000a2:00000000: 0' cat: 0000000200000432:000000a2:00000000: 0: No such file or directory [sanity]$ stat '0000000200000432:000000a2:00000000: 0' stat: cannot stat `0000000200000432:000000a2:00000000: 0': No such file or directory $ touch SANITY ## Force PENDING dirpages to be reread. touch: cannot touch `SANITY': Permission denied $ sys_getdents -x . r 2000004320000f6 `0000000200000432:000000f6:00000000: 0' d 200000001000007 `.' d 20000000100000d `..'
We can't open these files unless we stat() (or accesss()) them first.
$ cat '0000000200000432:000000f6:00000000: 0' cat: 0000000200000432:000000f6:00000000: 0: No such file or directory $ stat '0000000200000432:000000f6:00000000: 0' File: `0000000200000432:000000f6:00000000: 0' Size: 9 Blocks: 8 IO Block: 2097152 regular file Device: 2c54f966h/743766374d Inode: 144115206094586102 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2012-06-20 16:24:14.000000000 -0500 Modify: 2012-06-20 16:24:14.000000000 -0500 Change: 2012-06-20 16:24:21.000000000 -0500 $ cat '0000000200000432:000000f6:00000000: 0' SEACREST
In 2.1.2, I'm not sure how to access the ldiskfs root, but the FID of
the PENDING directory can be guessed from that of the ROOT (maybe it's
always the same anyway).
[sanity]$ lfs path2fid . [0x61ab:0x46d01c7d:0x0] $ sys_getdents -x .lustre/fid/[0x61aa:0x46d01c7c:0x0] r 200000400000001 `0000000200000400:00000001:00000000: 0' d 61aa `.' d 2000000 `..' [sanity]$ cat '.lustre/fid/[0x61aa:0x46d01c7c:0x0]/0000000200000400:00000001:00000000: 0' SEACREST
