ATA specification declares minimal reset time of 5us. SATA keeps it, but
requires devices to handle commands transmitted even one by one without
any gap.
The existing code calls kern_open() to resolve the vnode of a pathname
right after a stat(). This is not correct, because it causes random
character devices to be opened in /dev. This means ls'ing a tape
streamer will cause it to rewind, for example. Changes I have made:
- Add kern_statat_vnhook() to allow binary emulators to `post-process'
struct stat, using the proper vnode.
- Remove unneeded printf's from stat() and statfs().
- Make the Linuxolator use kern_statat_vnhook(), replacing
translate_path_major_minor_at().
- Let translate_fd_major_minor() use vp->v_rdev instead of
vp->v_un.vu_cdev.
Result:
crw-rw-rw- 1 root root 0, 14 Feb 20 13:54 /dev/ptmx
crw--w---- 1 root adm 136, 0 Feb 20 14:03 /dev/pts/0
crw--w---- 1 root adm 136, 1 Feb 20 14:02 /dev/pts/1
crw--w---- 1 ed tty 136, 2 Feb 20 14:03 /dev/pts/2
Before this commit, ptmx also had a major number of 136, because it
silently allocated and deallocated a pseudo-terminal. Device nodes that
cannot be opened now have proper major/minor-numbers.
Reviewed by: kib, netchild, rdivacky (thanks!)
as ATA RAID, but generic ATAPCI driver unable to detect drives there. AHCI
driver reported to handle them fine. Linux does the same.
Submitted by: Andrey V. Elsukov on stable@
This fixes the low "max device openings" count that has lead to poor
performance in FreeBSD 7.0 and 7.1.
Extra thanks goes to Mike Tancsa at Sentex for providing a debug system for
this.
1. Extend geom_dev by having it create the symlink (i.e. call
make_dev_alias) based on the DIOCGPROVIDERALIAS ioctl.
In this way the functionaility is generic and thus usable
by any geom/provider.
2. Have g_part handle said ioctl through the devalias method,
so that it's under control of the scheme itself. By design
the alias will not be created for newly added partitions.
have problems with kernels larger than 4MB.
Add a flag to avoid the /boot/loader and use the old method.
Add support for an additional makefile to perform custom manipulation
(this is not documented yet).
Add support for building an ISO image (not complete)
stale entries, we save a copy of the directory's modification time when
the first negative cache entry was added in the directory's NFS node.
When a negative cache entry is hit during a pathname lookup, the parent
directory's modification time is checked. If it has changed, all of the
negative cache entries for that parent are purged and the lookup falls
back to using the RPC. This required adding a new cache_purge_negative()
method to the name cache to purge only negative cache entries for a given
directory.
Submitted by: mohans, Rick Macklem, Ricardo Labiaga @ NetApp
Reviewed by: mohans
opportunistic ACCESS RPC to populate both the access and attribute caches
of the file and instead always use a GETATTR RPC. On many modern NFS
servers, an ACCESS RPC is much more expensive to service than a GETATTR
RPC.
Submitted by: mohans
open() of the same file will load fresh attributes, so they do not need to
be explicitly flushed in close() to guarantee close to open consistency.
However, other file desciptors may still reference this file and clearing
the attributes in close() forces those other file descriptors to fetch
fresh attributes the next time they need them.
Reviewed by: mohans
MFC after: 1 week
distinguish between a typo in the mode name and that the device does not
support a certain mode (till now both causes show the same result, i.e. the old
mode is displayed).
Submitted by: Christoph Mallon <christoph.mallon gmx.de>
Approved by: kib (mentor)
- Don't return a negative errno when using an unknown ioctl() on a
pseudo-terminal master device. Be sure to convert ENOIOCTL to ENOTTY,
just like the TTY layer does.
- Even though we should return st_rdev of the master device node when
emulating pty(4) devices, FIODGNAME should still return the name of
the slave device. Otherwise ptsname(3) and ttyname(3) return an
invalid device name.
values like 0x80 or 0x40 into a uint8_t foo:1 bitfield. This would
result in the bit always being 0. One of these caused a warning for
overflow (one that was 0x80), but the other didn't. They were both
wrong.
This is why I hate code that mixes c struct bitfields and #defines.
The rest of the fields accessed by the program should be audited.
Not enough space in user-land buffer is not an error, userland
will read further until eof is reached. So instead of propagating
-1 to caller we convert it to zero/success.
cd9660 code works exactly the same way.
PR: kern/78987
Reviewed by: jhb (mentor)
Approved by: jhb (mentor)
This is triggered only if BIOS configures ACPI_BITREG_BUS_MASTER_RLD
aka BRLD_EN_BM to 1.
Rationale:
1. we do not support C3 on PIIX4E
2. bus master activity need not break out of C2 state
3. because of CPU_QUIRK_NO_BM_CTRL quirk we may reset bus master
status which would result in immediate break out from C2
So if you have seen
cpu0: too many short sleeps, backing off to C1
with this chipset before you may want to try cx_lowest of C2 again.
Reviewed by: rpaulo (mentor), njl
Approved by: rpaulo (mentor)
ata_detach() to implement IOCATAATTACH/IOCATADETACH ioctls.
This will permit channel drivers to properly shutdown port hardware on channel
detach and init it on attach.
channel modes:
o usurp 'h' mode flag for half-width channels
o add 'q' mode flag for quarter-width channels
o rewrite rate parameter parsing to handle fractional values
o merge mode loops to eliminate ordering assumptions
o replace 0x80 with IEEE80211_RATE_MCS
