linux-4.4.1/sys_msync()
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開始行:
*参照元 [#ld99d2fc]
#backlinks
*説明 [#c23487c0]
-パス: [[linux-4.4.1/mm/msync.c]]
-FIXME: これは何?
--説明
**引数 [#t023f75e]
-unsigned long start
--
-size_t len
--
-int flags
--
**返り値 [#ed21c7eb]
-int
--
**参考 [#f68a0328]
*実装 [#s9fa4879]
/*
* 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 t...
* Now it doesn't do anything, since dirty pages are pro...
*
* The application may now run fsync() to
* write out the dirty pages and wait on the writeout an...
* Or the application may run fadvise(FADV_DONTNEED) aga...
* async writeout immediately.
* So by _not_ starting I/O in MS_ASYNC we provide compl...
* applications.
*/
SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len...
{
unsigned long end;
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
int unmapped_error = 0;
int error = -EINVAL;
-
--[[linux-4.4.1/mm_struct]]
--[[linux-4.4.1/current(global)]]
--[[linux-4.4.1/vm_area_struct]]
if (flags & ~(MS_ASYNC | MS_INVALIDATE | MS_SYNC))
goto out;
if (offset_in_page(start))
goto out;
if ((flags & MS_ASYNC) && (flags & MS_SYNC))
goto out;
-
--[[linux-4.4.1/offset_in_page()]]
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 add...
* just ignore them, but return -ENOMEM at the end.
*/
down_read(&mm->mmap_sem);
-
--[[linux-4.4.1/down_read()]]
vma = find_vma(mm, start);
-
--[[linux-4.4.1/find_vma()]]
for (;;) {
struct file *file;
loff_t fstart, fend;
-
--[[linux-4.4.1/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;
fstart = (start - vma->vm_start) +
((loff_t)vma->vm_pgoff << PAGE_SHIFT);
fend = fstart + (min(end, vma->vm_end) - start) - 1;
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_range(file, fstart, fend, 1);
fput(file);
-
--[[linux-4.4.1/get_file()]]
--[[linux-4.4.1/up_read()]]
--[[linux-4.4.1/vfs_fsync_range()]]
--[[linux-4.4.1/fput()]]
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;
}
*コメント [#g78b8dac]
終了行:
*参照元 [#ld99d2fc]
#backlinks
*説明 [#c23487c0]
-パス: [[linux-4.4.1/mm/msync.c]]
-FIXME: これは何?
--説明
**引数 [#t023f75e]
-unsigned long start
--
-size_t len
--
-int flags
--
**返り値 [#ed21c7eb]
-int
--
**参考 [#f68a0328]
*実装 [#s9fa4879]
/*
* 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 t...
* Now it doesn't do anything, since dirty pages are pro...
*
* The application may now run fsync() to
* write out the dirty pages and wait on the writeout an...
* Or the application may run fadvise(FADV_DONTNEED) aga...
* async writeout immediately.
* So by _not_ starting I/O in MS_ASYNC we provide compl...
* applications.
*/
SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len...
{
unsigned long end;
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
int unmapped_error = 0;
int error = -EINVAL;
-
--[[linux-4.4.1/mm_struct]]
--[[linux-4.4.1/current(global)]]
--[[linux-4.4.1/vm_area_struct]]
if (flags & ~(MS_ASYNC | MS_INVALIDATE | MS_SYNC))
goto out;
if (offset_in_page(start))
goto out;
if ((flags & MS_ASYNC) && (flags & MS_SYNC))
goto out;
-
--[[linux-4.4.1/offset_in_page()]]
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 add...
* just ignore them, but return -ENOMEM at the end.
*/
down_read(&mm->mmap_sem);
-
--[[linux-4.4.1/down_read()]]
vma = find_vma(mm, start);
-
--[[linux-4.4.1/find_vma()]]
for (;;) {
struct file *file;
loff_t fstart, fend;
-
--[[linux-4.4.1/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;
fstart = (start - vma->vm_start) +
((loff_t)vma->vm_pgoff << PAGE_SHIFT);
fend = fstart + (min(end, vma->vm_end) - start) - 1;
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_range(file, fstart, fend, 1);
fput(file);
-
--[[linux-4.4.1/get_file()]]
--[[linux-4.4.1/up_read()]]
--[[linux-4.4.1/vfs_fsync_range()]]
--[[linux-4.4.1/fput()]]
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;
}
*コメント [#g78b8dac]
ページ名: