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Improvement
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Resolution: Unresolved
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Minor
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None
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Lustre 2.10.5, Lustre 2.12.2
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CentOS 7
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9223372036854775807
It would be nice to have support for renameat2()'s Linux specific flags RENAME_EXCHANGE, which improves rename safety and efficiency of tools like mv that always try to use renameat2(..., RENAME_EXCHANGE) first.
For example, the code snippet below works on ext4 and xfs but not on Lustre:
#include <errno.h> #include <fcntl.h> #include <stdio.h> #include <unistd.h> #include <linux/fs.h> #include <sys/syscall.h> int main(int argc, char *argv[]) { int ret; ret = syscall(SYS_renameat2, AT_FDCWD, argv[1], AT_FDCWD, argv[2], RENAME_EXCHANGE); if (ret != 0) fprintf(stderr, "renameat2(%s, %s) ret=%d, errno=%d\n", argv[1], argv[2], ret, errno); return ret; }
$ renameat2 file1 file2 renameat2(file1, file2) ret=-1 errno=22
Example on ext4:
$ echo file1 > file1 $ echo file2 > file2 $ ./renameat2 file1 file2 renameat2 ret=0 errno=0 $ cat file1 file2 $ cat file2 file1
Thanks!
Stephane
