Hi all, I was running fstest (http://www.tuxera.com/community/posix-test-suite/) on btrfs. Only one test failed, and I believe it to be a bug in btrfs. The scenario is as follows: * crate a file. * note its times with stat. * sleep a few seconds * call truncate() on the file (not ftruncate(). ftruncate() works). * sync * note the file's times again with stat. expected result: ctime and mtime are greater. actual result: ctime and mtime remain unchanged. Example: [root@fedora-client pjd-fstest-20080816]# pwd /test/pjd-fstest-20080816 [root@fedora-client pjd-fstest-20080816]# mount | grep /test /dev/loop0 on /test type btrfs (rw,relatime) [root@fedora-client pjd-fstest-20080816]# touch ctime_test [root@fedora-client pjd-fstest-20080816]# stat ctime_test File: `ctime_test' Size: 0 Blocks: 0 IO Block: 4096 regular empty file Device: 29h/41d Inode: 1160 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2012-01-05 14:42:21.067444155 +0200 Modify: 2012-01-05 14:42:21.067444155 +0200 Change: 2012-01-05 14:42:21.067444155 +0200 Birth: - [root@fedora-client pjd-fstest-20080816]# strace ./fstest truncate ctime_test 200 execve("./fstest", ["./fstest", "truncate", "ctime_test", "200"], [/* 34 vars */]) = 0 brk(0) = 0x17c9000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f412616d000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=47545, ...}) = 0 mmap(NULL, 47545, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f4126161000 close(3) = 0 open("/lib64/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260\24\342e2\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1951736, ...}) = 0 mmap(0x3265e00000, 3773688, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x3265e00000 mprotect(0x3265f8f000, 2097152, PROT_NONE) = 0 mmap(0x326618f000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x18f000) = 0x326618f000 mmap(0x3266194000, 21752, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3266194000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4126160000 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f412615e000 arch_prctl(ARCH_SET_FS, 0x7f412615e720) = 0 mprotect(0x326618f000, 16384, PROT_READ) = 0 mprotect(0x326581e000, 4096, PROT_READ) = 0 munmap(0x7f4126161000, 47545) = 0 umask(0) = 022 truncate("ctime_test", 200) = 0 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 1), ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f412616c000 write(1, "0\n", 20 ) = 2 exit_group(0) = ? [root@fedora-client pjd-fstest-20080816]# sleep 2 [root@fedora-client pjd-fstest-20080816]# stat ctime_test File: `ctime_test' Size: 200 Blocks: 0 IO Block: 4096 regular file Device: 29h/41d Inode: 1160 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2012-01-05 14:42:21.067444155 +0200 Modify: 2012-01-05 14:42:21.067444155 +0200 Change: 2012-01-05 14:42:21.067444155 +0200 Birth: - -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
