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| author | ken <ken@FreeBSD.org> | 2013-08-15 22:52:39 +0000 |
|---|---|---|
| committer | ken <ken@FreeBSD.org> | 2013-08-15 22:52:39 +0000 |
| commit | 5591de079d3f2d8a4854b384d52322fc01bf57ea (patch) | |
| tree | 3aad15663c99de3361bd1808e8449ee767a03647 /sys/sys/conf.h | |
| parent | bdb743702fb53c60e30455a13dfd78783868ac2c (diff) | |
| download | FreeBSD-src-5591de079d3f2d8a4854b384d52322fc01bf57ea.zip FreeBSD-src-5591de079d3f2d8a4854b384d52322fc01bf57ea.tar.gz | |
Change the way that unmapped I/O capability is advertised.
The previous method was to set the D_UNMAPPED_IO flag in the cdevsw
for the driver. The problem with this is that in many cases (e.g.
sa(4)) there may be some instances of the driver that can handle
unmapped I/O and some that can't. The isp(4) driver can handle
unmapped I/O, but the esp(4) driver currently cannot. The cdevsw
is shared among all driver instances.
So instead of setting a flag on the cdevsw, set a flag on the cdev.
This allows drivers to indicate support for unmapped I/O on a
per-instance basis.
sys/conf.h: Remove the D_UNMAPPED_IO cdevsw flag and replace it
with an SI_UNMAPPED cdev flag.
kern_physio.c: Look at the cdev SI_UNMAPPED flag to determine
whether or not a particular driver can handle
unmapped I/O.
geom_dev.c: Set the SI_UNMAPPED flag for all GEOM cdevs.
Since GEOM will create a temporary mapping when
needed, setting SI_UNMAPPED unconditionally will
work.
Remove the D_UNMAPPED_IO flag.
nvme_ns.c: Set the SI_UNMAPPED flag on cdevs created here
if NVME_UNMAPPED_BIO_SUPPORT is enabled.
vfs_aio.c: In aio_qphysio(), check the SI_UNMAPPED flag on a
cdev instead of the D_UNMAPPED_IO flag on the cdevsw.
sys/param.h: Bump __FreeBSD_version to 1000045 for the switch from
setting the D_UNMAPPED_IO flag in the cdevsw to setting
SI_UNMAPPED in the cdev.
Reviewed by: kib, jimharris
MFC after: 1 week
Sponsored by: Spectra Logic
Diffstat (limited to 'sys/sys/conf.h')
| -rw-r--r-- | sys/sys/conf.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/sys/conf.h b/sys/sys/conf.h index 5a579b4..fcce859 100644 --- a/sys/sys/conf.h +++ b/sys/sys/conf.h @@ -61,6 +61,7 @@ struct cdev { #define SI_CHILD 0x0010 /* child of another struct cdev **/ #define SI_DUMPDEV 0x0080 /* is kernel dumpdev */ #define SI_CLONELIST 0x0200 /* on a clone list */ +#define SI_UNMAPPED 0x0400 /* can handle unmapped I/O */ struct timespec si_atime; struct timespec si_ctime; struct timespec si_mtime; @@ -167,7 +168,6 @@ typedef int dumper_t( #define D_MMAP_ANON 0x00100000 /* special treatment in vm_mmap.c */ #define D_NEEDGIANT 0x00400000 /* driver want Giant */ #define D_NEEDMINOR 0x00800000 /* driver uses clone_create() */ -#define D_UNMAPPED_IO 0x01000000 /* d_strategy can accept unmapped IO */ /* * Version numbers. |
