On Wed, Jun 06, 2018 at 02:30:41AM -0400, james harvey wrote:
> Prevent unnecessary error from failing fsync(), if opened read only.
>
> Performed 'grep "writeable = " *.h *.c' to make sure there were no odd
> situations where fsync() might still be desired here. They're all straight-
> forward. The only situation where writeable will be 0 is if btrfs_open_devices
> is given flags without O_RDWR. There is no situation where a writeable volume
> temporarily becomes unwriteable, or anything like that. Given that it's being
> opened O_RDWR, there's no reason to attempt fsync().
>
> utils.c
>
> int btrfs_add_to_fsid() {
> ...
> device->writeable = 1;
>
> volumes.c
>
> int btrfs_close_devices() {
> ...
> while (!list_empty(&fs_devices->devices)) {
> ...
> // just after the fsync() being patched
> 267: device->writeable = 0;
> ...
> int btrfs_open_devices() {
> ...
> list_for_each_entry(device, &fs_devices->devices, dev_list) {
> ...
> if (flags & O_RDWR)
> 332: device->writeable = 1
>
> kernel btrfs_close_devices() does not have a corresponding fsync() that I see.
>
> Signed-off-by: James Harvey <jamespharvey20@xxxxxxxxx>
Applied, thanks.
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