Revision 1e8d4e8be2e104514564983239af9dd9521c7779 authored by Linus Torvalds on 26 August 2011, 16:01:30 UTC, committed by Linus Torvalds on 26 August 2011, 16:01:30 UTC
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6: (32 commits) ALSA: hda: Conexant: Allow different output types to share DAC ASoC: Correct element count for WM8996 sidetone HPF ASoC: Tegra: wm8903 machine driver: Drop Ventana support ASoC: Add samsung maintainer ASoC: Add Springbank I/O card to Speyside Kconfig ALSA: hda/conexant - Enable ADC-switching for auto-mic mode, too ALSA: hda - Fix double-headphone/speaker paths for Cxt auto-parser ALSA: hda - Update jack-sense info even when no automute is set ALSA: hda - Fix output-path initialization for Realtek auto-parser sound/soc/fsl/mpc8610_hpcd.c: add missing of_node_put sound/soc/fsl/p1022_ds.c: add missing of_node_put sound/soc/ep93xx/ep93xx-i2s.c: add missing kfree sound/soc/kirkwood/kirkwood-i2s.c: add missing kfree ASoC: soc-core: use GFP_KERNEL flag for kmalloc in snd_soc_cnew sound/soc/fsl/fsl_dma.c: add missing of_node_put ASoC: Clear completions from late WM8996 FLL lock IRQs ASoC: Clear any outstanding WM8962 FLL lock completions before waiting ASoC: Ensure we only run Speyside WM8962 bias level callbacks once ASoC: Fix configuration of WM8996 input enables ASoC: WM8996 record paths need AIFCLK ...
msync.c
/*
* linux/mm/msync.c
*
* Copyright (C) 1994-1999 Linus Torvalds
*/
/*
* The msync() system call.
*/
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/syscalls.h>
#include <linux/sched.h>
/*
* MS_SYNC syncs the entire file - including mappings.
*
* MS_ASYNC does not start I/O (it used to, up to 2.5.67).
* Nor does it marks the relevant pages dirty (it used to up to 2.6.17).
* Now it doesn't do anything, since dirty pages are properly tracked.
*
* The application may now run fsync() to
* write out the dirty pages and wait on the writeout and check the result.
* Or the application may run fadvise(FADV_DONTNEED) against the fd to start
* async writeout immediately.
* So by _not_ starting I/O in MS_ASYNC we provide complete flexibility to
* applications.
*/
SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
{
unsigned long end;
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
int unmapped_error = 0;
int error = -EINVAL;
if (flags & ~(MS_ASYNC | MS_INVALIDATE | MS_SYNC))
goto out;
if (start & ~PAGE_MASK)
goto out;
if ((flags & MS_ASYNC) && (flags & MS_SYNC))
goto out;
error = -ENOMEM;
len = (len + ~PAGE_MASK) & PAGE_MASK;
end = start + len;
if (end < start)
goto out;
error = 0;
if (end == start)
goto out;
/*
* If the interval [start,end) covers some unmapped address ranges,
* just ignore them, but return -ENOMEM at the end.
*/
down_read(&mm->mmap_sem);
vma = find_vma(mm, start);
for (;;) {
struct file *file;
/* Still start < end. */
error = -ENOMEM;
if (!vma)
goto out_unlock;
/* Here start < vma->vm_end. */
if (start < vma->vm_start) {
start = vma->vm_start;
if (start >= end)
goto out_unlock;
unmapped_error = -ENOMEM;
}
/* Here vma->vm_start <= start < vma->vm_end. */
if ((flags & MS_INVALIDATE) &&
(vma->vm_flags & VM_LOCKED)) {
error = -EBUSY;
goto out_unlock;
}
file = vma->vm_file;
start = vma->vm_end;
if ((flags & MS_SYNC) && file &&
(vma->vm_flags & VM_SHARED)) {
get_file(file);
up_read(&mm->mmap_sem);
error = vfs_fsync(file, 0);
fput(file);
if (error || start >= end)
goto out;
down_read(&mm->mmap_sem);
vma = find_vma(mm, start);
} else {
if (start >= end) {
error = 0;
goto out_unlock;
}
vma = vma->vm_next;
}
}
out_unlock:
up_read(&mm->mmap_sem);
out:
return error ? : unmapped_error;
}
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