38585ccc46
In kernel 3.11 O_TMPFILE was introduced, but the open flag value conflicts with the O_LOV_DELAY_CREATE flag 020000000 previously used by Lustre-aware applications. O_LOV_DELAY_CREATE allows applications to defer file layout and object creation from open time (the default) until it can instead be specified by the application using an ioctl. Instead of trying to find a non-conflicting O_LOV_DELAY_CREATE flag or define a Lustre-specific flag that isn't of use to most/any other filesystems, use (O_NOCTTY|FASYNC) as the new value. These flags are not meaningful for newly-created regular files and should be OK since O_LOV_DELAY_CREATE is only meaningful for new files. I looked into using O_ACCMODE/FMODE_WRITE_IOCTL, which allows calling ioctl() on the minimally-opened fd and is close to what is needed, but that doesn't allow specifying the actual read or write mode for the file, and fcntl(F_SETFL) doesn't allow O_RDONLY/O_WRONLY/O_RDWR to be set after the file is opened. Lustre-change: http://review.whamcloud.com/8312 Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4209 Signed-off-by: Andreas Dilger <andreas.dilger@intel.com> Signed-off-by: Oleg Drokin <oleg.drokin@intel.com> Signed-off-by: Peng Tao <bergwolf@gmail.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
||
|---|---|---|
| .. | ||
| include/linux | ||
| lnet | ||
| lustre | ||
| Kconfig | ||
| Makefile | ||
| TODO | ||