Gerd Hoffmann
f3554f4bc6
preadv/pwritev: Add preadv and pwritev system calls. ...
This patch adds preadv and pwritev system calls. These syscalls are a
pretty straightforward combination of pread and readv (same for write).
They are quite useful for doing vectored I/O in threaded applications.
Using lseek+readv instead opens race windows you'll have to plug with
locking.
Other systems have such system calls too, for example NetBSD, check
here: http://www.daemon-systems.org/man/preadv.2.html
The application-visible interface provided by glibc should look like
this to be compatible to the existing implementations in the *BSD family:
ssize_t preadv(int d, const struct iovec *iov, int iovcnt, off_t offset);
ssize_t pwritev(int d, const struct iovec *iov, int iovcnt, off_t offset);
This prototype has one problem though: On 32bit archs is the (64bit)
offset argument unaligned, which the syscall ABI of several archs doesn't
allow to do. At least s390 needs a wrapper in glibc to handle this. As
we'll need a wrappers in glibc anyway I've decided to push problem to
glibc entriely and use a syscall prototype which works without
arch-specific wrappers inside the kernel: The offset argument is
explicitly splitted into two 32bit values.
The patch sports the actual system call implementation and the windup in
the x86 system call tables. Other archs follow as separate patches.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <linux-api@vger.kernel.org>
Cc: <linux-arch@vger.kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-02 19:05:08 -07:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
memory_accessor: implement the new memory_accessor interface for I2C EEPROM
2009-04-02 19:04:50 -07:00
NLM: Shrink the IPv4-only version of nlm_cmp_addr()
2009-03-10 20:33:19 -04:00
ASoC: Add initial driver for the WM8400 CODEC
2009-03-11 13:49:46 +00:00
mlx4_core: Add link type autosensing
2009-03-18 19:45:11 -07:00
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6
2009-03-26 22:45:23 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
Merge branch 'header-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-03-26 16:11:41 -07:00
spi-gpio: allow operation without CS signal
2009-04-02 19:04:51 -07:00
ssb: Add SPROM fallback support
2009-03-05 14:39:32 -05:00
SUNRPC: Remove @family argument from svc_create() and svc_create_pooled()
2009-03-28 15:54:48 -04:00
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
2009-03-26 15:23:24 -07:00
wimax: struct device - replace bus_id with dev_name(), dev_set_name()
2009-03-24 16:38:23 -07:00
Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6
2009-04-01 09:47:12 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev
2009-03-26 11:20:23 -07:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
autofs4: fix kernel includes
2009-04-01 08:59:23 -07:00
autofs4: fix kernel includes
2009-04-01 08:59:23 -07:00
struct linux_binprm: drop unused fields
2009-04-02 19:05:01 -07:00
block: add private bio_set for bio integrity allocations
2009-03-24 12:35:17 +01:00
block: reduce stack footprint of blk_recount_segments()
2009-02-26 10:45:48 +01:00
mm: enable hashdist by default on 64bit NUMA
2009-04-01 08:59:14 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
2009-03-28 13:30:43 -07:00
mm: page_mkwrite change prototype to match fault
2009-04-01 08:59:14 -07:00
nfsd: nfsd should drop CAP_MKNOD for non-root
2009-03-17 14:55:55 -04:00
cgroups: add 'data' field to struct cgroup_scanner
2009-04-02 19:04:56 -07:00
clkdev: add possibility to get a clock based on the device name
2009-03-27 14:51:13 +01:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
preadv/pwritev: Add preadv and pwritev system calls.
2009-04-02 19:05:08 -07:00
[ARM] 5421/1: ftrace: fix crash due to tracing of __naked functions
2009-03-12 21:33:03 +00:00
compiler-gcc4: conditionalize #error on __KERNEL__
2009-03-26 18:14:23 +01:00
vcs: hook sysfs devices into object lifetime instead of "binding"
2009-03-24 16:38:26 -07:00
cpu hotplug: remove unused cpuhotplug_mutex_lock()
2009-04-02 19:05:00 -07:00
Revert "[CPUFREQ] Disable sysfs ui for p4-clockmod."
2009-03-09 15:07:33 -04:00
cpusets: replace zone allowed functions with node allowed
2009-04-02 19:04:57 -07:00
crypto: compress - Add pcomp interface
2009-03-04 15:05:33 +08:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
dca: add missing copyright/license headers
2009-03-21 13:31:23 -07:00
fs: make struct dentry->d_op const
2009-03-27 14:43:59 -04:00
net headers: cleanup dcbnl.h
2009-03-01 00:19:35 -08:00
dynamic debug: combine dprintk and dynamic printk
2009-03-24 16:38:26 -07:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
dma-debug: fix dma_debug_add_bus() definition for !CONFIG_DMA_API_DEBUG
2009-03-18 11:53:48 +01:00
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
2009-03-08 10:23:05 -07:00
x86, x2apic: cleanup ifdef CONFIG_INTR_REMAP in io_apic code
2009-03-17 15:45:07 -07:00
dmi: Let dmi_walk() users pass private data
2009-03-30 21:46:44 +02:00
Dynamic debug: fix pr_fmt() build error
2009-03-24 16:38:27 -07:00
eventfd: improve support for semaphore-like behavior
2009-04-01 08:59:20 -07:00
Rename struct file->f_ep_lock
2009-03-16 08:32:27 -06:00
ext3: remove the BKL in ext3/ioctl.c
2009-04-02 19:04:52 -07:00
fbdev: uninline lock_fb_info()
2009-04-01 08:59:29 -07:00
firewire: cdev: add closure to async stream ioctl
2009-03-24 20:56:50 +01:00
filesystem freeze: allow SysRq emergency thaw to thaw frozen filesystems
2009-04-01 08:59:17 -07:00
Annotate struct fs_struct's usage count restriction
2009-03-28 17:30:00 -07:00
spi_mpc83xx: add OF platform driver bindings
2009-04-01 08:59:22 -07:00
net: reorder struct Qdisc for better SMP performance
2009-03-20 01:33:32 -07:00
block: genhd.h cleanup patch
2009-03-24 12:35:17 +01:00
remove stale comment from <linux/hdreg.h>
2009-03-05 16:10:59 +01:00
mm: introduce debug_kmap_atomic
2009-04-01 08:59:14 -07:00
i2c-algo-pca: Add PCA9665 support
2009-03-28 21:34:44 +01:00
V4L/DVB (11096): V4L2 Driver for the Hauppauge HD PVR usb capture device
2009-03-30 12:43:28 -03:00
i2c-algo-pca: Rework waiting for a free bus
2009-03-28 21:34:45 +01:00
ide: inline SELECT_DRIVE()
2009-03-31 20:15:33 +02:00
cgroup: CSS ID support
2009-04-02 19:04:53 -07:00
nl80211: Add MLME primitives to support external SME
2009-03-27 20:13:02 -04:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
2009-03-28 13:30:43 -07:00
wan: convert sdla driver to net_device_ops
2009-03-27 00:46:44 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
Merge branch 'topic/jack' into for-linus
2009-03-24 00:35:43 +01:00
Merge branch 'iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-03-30 13:41:00 -07:00
PM: Introduce functions for suspending and resuming device interrupts
2009-03-30 21:46:54 +02:00
fix warning in io_mapping_map_wc()
2009-03-02 09:43:32 +01:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
proc 2/2: remove struct proc_dir_entry::owner
2009-03-31 01:14:44 +04:00
PM: Introduce functions for suspending and resuming device interrupts
2009-03-30 21:46:54 +02:00
Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2
2009-03-27 17:28:43 +01:00
genirq: make irqreturn_t an enum
2009-03-13 14:32:29 +01:00
V4L/DVB (11042): v4l2-api: Add definitions for V4L2_MPEG_STREAM_VBI_FMT_IVTV payloads
2009-03-30 12:43:22 -03:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
ext4: Use WRITE_SYNC for commits which are caused by fsync()
2009-03-25 23:35:46 -04:00
make MTD headers use strict integer types
2009-03-26 18:14:17 +01:00
add fiemap.h to header-y
2009-04-02 19:04:49 -07:00
kexec: add dmesg log symbols to /proc/vmcoreinfo lists
2009-04-02 19:05:04 -07:00
Driver core: implement uevent suppress in kobject
2009-03-24 16:38:26 -07:00
KVM: Correct deassign device ioctl to IOW
2009-03-24 11:03:15 +02:00
KVM: Report IRQ injection status to userspace.
2009-03-24 11:03:11 +02:00
KVM: Move struct kvm_pio_request into x86 kvm_host.h
2009-03-24 11:02:55 +02:00
[libata] Improve timeout handling
2009-03-24 22:52:39 -04:00
loop: add ioctl to resize a loop device
2009-04-01 08:59:17 -07:00
[SCSI] major.h: char-major number for OSD device driver
2009-03-12 12:58:05 -05:00
sh: maple: Support block reads and writes.
2009-02-27 16:07:32 +09:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
memcg: remove mem_cgroup_reclaim_imbalance() remnants
2009-04-02 19:04:56 -07:00
memory_accessor: new interface for reading/writing persistent memory
2009-04-02 19:04:50 -07:00
[SCSI] mpt2sas: add MPT2SAS_MINOR(221) to miscdevice.h
2009-03-13 15:57:40 -05:00
nommu: fix a number of issues with the per-MM VMA patch
2009-04-02 19:04:48 -07:00
generic debug pagealloc: build fix
2009-04-02 19:04:48 -07:00
mm: introduce for_each_populated_zone() macro
2009-04-01 08:59:11 -07:00
platform: introduce module id table for platform devices
2009-03-24 16:38:24 -07:00
Add a strictatime mount option
2009-03-26 10:56:35 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
PCI MSI: Add support for multiple MSI
2009-03-20 10:48:14 -07:00
constify dentry_operations: misc filesystems
2009-03-27 14:44:00 -04:00
neigh: Allow for user space users of the neighbour table
2009-03-04 00:03:08 -08:00
net: reorder fields of struct socket
2009-03-15 19:59:13 -07:00
Network Drop Monitor: Adding drop monitor implementation & Netlink protocol
2009-03-13 12:09:29 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
2009-03-28 13:30:43 -07:00
netlink: add NETLINK_NO_ENOBUFS socket flag
2009-03-24 16:37:55 -07:00
netpoll: store local and remote ip in net-endian
2009-03-28 23:55:58 -07:00
Merge branch 'devel' into for-linus
2009-04-01 13:28:15 -04:00
NFSv4: Simplify some cache consistency post-op GETATTRs
2009-03-11 14:10:28 -04:00
Merge branch 'devel' into for-linus
2009-04-01 13:28:15 -04:00
NFSv3: Fix posix ACL code
2009-03-10 20:33:18 -04:00
nl80211: Remove NL80211_CMD_SET_MGMT_EXTRA_IE
2009-03-27 20:13:04 -04:00
generic debug pagealloc
2009-04-01 08:59:13 -07:00
nommu: there is no mlock() for NOMMU, so don't provide the bits
2009-04-01 08:59:14 -07:00
cgroups: use css id in swap cgroup for saving memory v5
2009-04-02 19:04:56 -07:00
mm: define a UNIQUE value for AS_UNEVICTABLE flag
2009-04-02 19:04:49 -07:00
mm: remove pagevec_swap_free()
2009-04-01 08:59:13 -07:00
PCI/ACPI: fix wrong assumption in acpi_find_root_bridge_handle
2009-03-20 10:47:57 -07:00
Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6
2009-04-01 09:47:12 -07:00
pci: Add AMD8111 PCI Bridge PCI Device ID
2009-04-02 19:05:03 -07:00
PCI: save and restore PCIe 2.0 registers
2009-03-26 16:02:30 -07:00
PCI: PCIe portdrv: Implement pm object
2009-03-20 10:47:49 -07:00
percpu: generalize embedding first chunk setup helper
2009-03-10 16:27:48 +09:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
phylib: convert state_queue work to delayed_work
2009-03-13 15:41:19 -07:00
driver core: move platform_data into platform_device
2009-03-24 16:38:26 -07:00
Driver core: Fix device_move() vs. dpm list ordering, v2
2009-03-24 16:38:26 -07:00
generic debug pagealloc
2009-04-01 08:59:13 -07:00
ppp: ppp_mp_explode() redesign
2009-03-13 16:09:12 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
proc 2/2: remove struct proc_dir_entry::owner
2009-03-31 01:14:44 +04:00
forget_original_parent: split out the un-ptrace part
2009-04-02 19:05:00 -07:00
quota: Remove NODQUOT macro
2009-03-26 02:18:35 +01:00
quota: Remove uppercase aliases for quota functions.
2009-03-26 02:18:37 +01:00
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
RDS: Add userspace header
2009-02-26 23:42:11 -08:00
reiserfs: fix build breakage
2009-03-30 14:28:58 -07:00
Merge branch 'reiserfs-updates' from Jeff Mahoney
2009-03-30 12:33:01 -07:00
reiserfs: make per-inode xattr locking more fine grained
2009-03-30 12:16:38 -07:00
reiserfs: strip trailing whitespace
2009-03-30 12:16:39 -07:00
reiserfs: add atomic addition of selinux attributes during inode creation
2009-03-30 12:16:39 -07:00
rtc-v3020: add ability to access v3020 chip with GPIOs
2009-04-02 19:04:51 -07:00
rtc: convert LEAP_YEAR into an inline
2009-04-01 08:59:24 -07:00
rtnetlink: add new value for DHCP added routes
2009-03-19 23:49:41 -07:00
pids: kill signal_struct-> __pgrp/__session and friends
2009-04-02 19:05:02 -07:00
lsm: Remove the socket_post_accept() hook
2009-03-28 15:01:37 +11:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
cpumask: fix seq_bitmap_*() functions.
2009-03-30 22:05:11 +10:30
Input: serio - fix protocol number for TouchIT213
2009-03-07 18:41:38 -08:00
sh: multiple vectors per irq - base
2009-02-27 16:53:50 +09:00
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
2009-03-29 01:40:34 -07:00
Merge branches 'topic/slob/cleanups', 'topic/slob/fixes', 'topic/slub/core', 'topic/slub/cleanups' and 'topic/slub/perf' into for-linus
2009-03-24 10:25:21 +02:00
Merge branch 'header-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-03-26 16:11:41 -07:00
memdup_user(): introduce
2009-04-01 08:59:13 -07:00
pm: rework includes, remove arch ifdefs
2009-04-01 08:59:16 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
shmem: writepage directly to swap
2009-04-01 08:59:15 -07:00
synclink_gt: add clock options
2009-04-02 19:05:01 -07:00
preadv/pwritev: Add preadv and pwritev system calls.
2009-04-02 19:05:08 -07:00
tcp: cache result of earlier divides when mss-aligning things
2009-03-15 20:09:55 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
Merge branch 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-03-30 17:17:35 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
tracehook_notify_death: use task_detached() helper
2009-04-02 19:05:00 -07:00
proc tty: remove struct tty_operations::read_proc
2009-04-01 08:59:10 -07:00
remove __KERNEL_STRICT_NAMES
2009-03-26 18:14:21 +01:00
x86, mm: dont use non-temporal stores in pagecache accesses
2009-03-02 11:06:49 +01:00
UIO: Add name attributes for mappings and port regions
2009-03-24 16:38:24 -07:00
USB: make actual_length in struct urb field u32
2009-03-24 16:20:36 -07:00
usb-storage: prepare for subdriver separation
2009-03-24 16:20:34 -07:00
Fix recursive lock in free_uid()/free_user_ns()
2009-02-27 16:26:21 -08:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
V4L/DVB (10907): avoid loading the entire videodev.h header on V4L2 drivers
2009-03-30 12:43:15 -03:00
V4L/DVB (11213): gspca - sq905c: New subdriver.
2009-03-30 12:43:40 -03:00
epoll keyed wakeups: introduce new *_poll() wakeup macros
2009-04-01 08:59:20 -07:00
workqueue: add to_delayed_work() helper function
2009-04-02 19:04:50 -07:00
mm: fix proc_dointvec_userhz_jiffies "breakage"
2009-04-01 08:59:13 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
