diff options
| author | Konstantin Belousov <kib@FreeBSD.org> | 2018-11-14 14:18:35 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2018-11-14 14:18:35 +0000 |
| commit | 1c4ca7789029ae5478e160fd43b039b71523c0d2 (patch) | |
| tree | ebe30c84784f39aefcec04c4927db112c2c93bf0 /sys/fs/devfs | |
| parent | d5aef6d6ca05d7d7d8aa53b410ecd6d63e18d083 (diff) | |
| download | src-1c4ca7789029ae5478e160fd43b039b71523c0d2.tar.gz src-1c4ca7789029ae5478e160fd43b039b71523c0d2.zip | |
Add d_off support for multiple filesystems.
The d_off field has been added to the dirent structure recently.
Currently filesystems don't support this feature. Support has been
added and tested for zfs, ufs, ext2fs, fdescfs, msdosfs and unionfs.
A stub implementation is available for cd9660, nandfs, udf and
pseudofs but hasn't been tested.
Motivation for this feature: our usecase is for a userspace nfs server
(nfs-ganesha) with zfs. At the moment we cache direntry offsets by
calling lseek once per entry, with this patch we can get the offset
directly from getdirentries(2) calls which provides a significant
speedup.
Submitted by: Jack Halford <jack@gandi.net>
Reviewed by: mckusick, pfg, rmacklem (previous versions)
Sponsored by: Gandi.net
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D17917
Notes
Notes:
svn path=/head/; revision=340431
Diffstat (limited to 'sys/fs/devfs')
| -rw-r--r-- | sys/fs/devfs/devfs_vnops.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/fs/devfs/devfs_vnops.c b/sys/fs/devfs/devfs_vnops.c index 5c0bf603ab9b..c046c4e88ad3 100644 --- a/sys/fs/devfs/devfs_vnops.c +++ b/sys/fs/devfs/devfs_vnops.c @@ -1381,6 +1381,8 @@ devfs_readdir(struct vop_readdir_args *ap) if (dp->d_reclen > uio->uio_resid) break; dp->d_fileno = de->de_inode; + /* NOTE: d_off is the offset for the *next* entry. */ + dp->d_off = off + dp->d_reclen; if (off >= uio->uio_offset) { error = vfs_read_dirent(ap, dp, off); if (error) |