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Add lock_page_killable

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This routine is like lock_page, but can be interrupted by a fatal signal

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
This commit is contained in:
Matthew Wilcox
2007-12-06 11:18:49 -05:00
committed by Matthew Wilcox
parent f776d12dd1
commit 2687a3569e
2 changed files with 28 additions and 0 deletions
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14
include/linux/pagemap.h
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@ -157,6 +157,7 @@ static inline pgoff_t linear_page_index(struct vm_area_struct *vma,
}
extern void FASTCALL(__lock_page(struct page *page));
extern int FASTCALL(__lock_page_killable(struct page *page));
extern void FASTCALL(__lock_page_nosync(struct page *page));
extern void FASTCALL(unlock_page(struct page *page));
@ -170,6 +171,19 @@ static inline void lock_page(struct page *page)
__lock_page(page);
}
/*
* lock_page_killable is like lock_page but can be interrupted by fatal
* signals. It returns 0 if it locked the page and -EINTR if it was
* killed while waiting.
*/
static inline int lock_page_killable(struct page *page)
{
might_sleep();
if (TestSetPageLocked(page))
return __lock_page_killable(page);
return 0;
}
/*
* lock_page_nosync should only be used if we can't pin the page's inode.
* Doesn't play quite so well with block device plugging.