https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-16569 Lustre <p>Here is the problem, Lustre does not filter supported attributes and as a result file became unaccessible.</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>$touch /mnt/lustre/f2 $lsattr /mnt/lustre/f2 ---------------------- /mnt/lustre/f2 $chattr +aAcCdDeFijmPsStTux /mnt/lustre/f2 $lsattr /mnt/lustre/f2 lsattr: No data available While reading flags on /mnt/lustre/f2 $cat /mnt/lustre/f2 cat: /mnt/lustre/f2: No data available $statx /mnt/lustre/f2 File: /mnt/lustre/f2 Size: 0 Blocks: 0 IO Block: 4194304 regular empty file Device: 2c54f966h/743766374d Inode: 144115205272502274 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Context: unconfined_u:object_r:unlabeled_t:s0 Access: 2023-02-16 18:08:06.000000000 -0500 Modify: 2023-02-16 18:08:06.000000000 -0500 Change: 2023-02-16 18:08:06.000000000 -0500 Birth: 2023-02-16 18:08:06.000000000 -0500 </pre> </div></div> LU-16569

chattr makes file unavailable

Bug Major Open Unresolved Sebastien Buisson Alexander Boyko Fri, 17 Feb 2023 11:15:40 +0000 Mon, 20 Feb 2023 13:41:54 +0000 Lustre 2.16.0 0 3 <p>This definitely looks like it could screw up encrypted files:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre># for F in a A c C d D e F i j m P s S t T u x; do touch /mnt/testfs/dir_attr/f-$F chattr +$F /mnt/testfs/dir_attr/f-$F done # ls -l /mnt/testfs/dir_attr total 0 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-a 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-A 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-c 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-C 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-d 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-D 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-e 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-F 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-i 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-j 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-m 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-P 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-s 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-S 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-t 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-T 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-u 0 -rw-r--r--. 1 root 0 Feb 17 18:40 f-x # lsattr /mnt/testfs/dir_attr ---------------------- /mnt/testfs/dir_attr/f-F ---------------------- /mnt/testfs/dir_attr/f-c ---------------------- /mnt/testfs/dir_attr/f-d ---------------------- /mnt/testfs/dir_attr/f-D ---------------------- /mnt/testfs/dir_attr/f-m -------A-------------- /mnt/testfs/dir_attr/f-A lsattr: Required key not available While reading flags on /mnt/testfs/dir_attr/f-C ---------------------- /mnt/testfs/dir_attr/f-s --S------------------- /mnt/testfs/dir_attr/f-S ---------------------- /mnt/testfs/dir_attr/f-T ---------------------- /mnt/testfs/dir_attr/f-x ---------------------- /mnt/testfs/dir_attr/f-u -------------------P-- /mnt/testfs/dir_attr/f-P -----a---------------- /mnt/testfs/dir_attr/f-a ----i----------------- /mnt/testfs/dir_attr/f-i ---------------------- /mnt/testfs/dir_attr/f-t ---------------------- /mnt/testfs/dir_attr/f-e ---------------------- /mnt/testfs/dir_attr/f-j </pre> </div></div> <p>While I'm not sure the <b>clients</b> should filter the flags (since they may not know which ones the servers support), definitely the MDS should filter the unknown/unsupported flags (or whitelist only known flags). I <em>think</em> there is a flag whitelist in newer ext4 code, not sure what version that appeared in, but we might also bypass those checks in osd-ldiskfs.</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>lsattr: Required key not available While reading flags on /mnt/testfs/dir_attr/f-C </pre> </div></div> <p>I am not even sure why it complains about a 'key' on the file <tt>f-C</tt>, as it just has a COW-related flag:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>C A file with the 'C' attribute set will not be subject to copy-on-write updates. This flag is only supported on file systems which perform copy-on-write. (Note: For btrfs, the 'C' flag should be set on new or empty files. If it is set on a file which already has data blocks, it is undefined when the blocks assigned to the file will be fully stable. If the 'C' flag is set on a directory, it will have no effect on the directory, but new files created in that directory will have the No_COW attribute set. If the 'C' flag is set, then the 'c' flag cannot be set.) </pre> </div></div> Development Rank 1|i03ee7: Rank (Obsolete) 9223372036854775807 Severity