mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Matthew Wilcox](/assets/img/avatar_default.png)
All callers of get_xip_mem() are now gone. Remove checks for it, initialisers of it, documentation of it and the only implementation of it. Also remove mm/filemap_xip.c as it is now empty. Also remove documentation of the long-gone get_xip_page(). Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com> Cc: Andreas Dilger <andreas.dilger@intel.com> Cc: Boaz Harrosh <boaz@plexistor.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Dave Chinner <david@fromorbit.com> Cc: Jan Kara <jack@suse.cz> Cc: Jens Axboe <axboe@kernel.dk> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
162 lines
3.7 KiB
C
162 lines
3.7 KiB
C
/*
|
|
* mm/fadvise.c
|
|
*
|
|
* Copyright (C) 2002, Linus Torvalds
|
|
*
|
|
* 11Jan2003 Andrew Morton
|
|
* Initial version.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/file.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/backing-dev.h>
|
|
#include <linux/pagevec.h>
|
|
#include <linux/fadvise.h>
|
|
#include <linux/writeback.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/swap.h>
|
|
|
|
#include <asm/unistd.h>
|
|
|
|
/*
|
|
* POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could
|
|
* deactivate the pages and clear PG_Referenced.
|
|
*/
|
|
SYSCALL_DEFINE4(fadvise64_64, int, fd, loff_t, offset, loff_t, len, int, advice)
|
|
{
|
|
struct fd f = fdget(fd);
|
|
struct inode *inode;
|
|
struct address_space *mapping;
|
|
struct backing_dev_info *bdi;
|
|
loff_t endbyte; /* inclusive */
|
|
pgoff_t start_index;
|
|
pgoff_t end_index;
|
|
unsigned long nrpages;
|
|
int ret = 0;
|
|
|
|
if (!f.file)
|
|
return -EBADF;
|
|
|
|
inode = file_inode(f.file);
|
|
if (S_ISFIFO(inode->i_mode)) {
|
|
ret = -ESPIPE;
|
|
goto out;
|
|
}
|
|
|
|
mapping = f.file->f_mapping;
|
|
if (!mapping || len < 0) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (IS_DAX(inode)) {
|
|
switch (advice) {
|
|
case POSIX_FADV_NORMAL:
|
|
case POSIX_FADV_RANDOM:
|
|
case POSIX_FADV_SEQUENTIAL:
|
|
case POSIX_FADV_WILLNEED:
|
|
case POSIX_FADV_NOREUSE:
|
|
case POSIX_FADV_DONTNEED:
|
|
/* no bad return value, but ignore advice */
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
/* Careful about overflows. Len == 0 means "as much as possible" */
|
|
endbyte = offset + len;
|
|
if (!len || endbyte < len)
|
|
endbyte = -1;
|
|
else
|
|
endbyte--; /* inclusive */
|
|
|
|
bdi = inode_to_bdi(mapping->host);
|
|
|
|
switch (advice) {
|
|
case POSIX_FADV_NORMAL:
|
|
f.file->f_ra.ra_pages = bdi->ra_pages;
|
|
spin_lock(&f.file->f_lock);
|
|
f.file->f_mode &= ~FMODE_RANDOM;
|
|
spin_unlock(&f.file->f_lock);
|
|
break;
|
|
case POSIX_FADV_RANDOM:
|
|
spin_lock(&f.file->f_lock);
|
|
f.file->f_mode |= FMODE_RANDOM;
|
|
spin_unlock(&f.file->f_lock);
|
|
break;
|
|
case POSIX_FADV_SEQUENTIAL:
|
|
f.file->f_ra.ra_pages = bdi->ra_pages * 2;
|
|
spin_lock(&f.file->f_lock);
|
|
f.file->f_mode &= ~FMODE_RANDOM;
|
|
spin_unlock(&f.file->f_lock);
|
|
break;
|
|
case POSIX_FADV_WILLNEED:
|
|
/* First and last PARTIAL page! */
|
|
start_index = offset >> PAGE_CACHE_SHIFT;
|
|
end_index = endbyte >> PAGE_CACHE_SHIFT;
|
|
|
|
/* Careful about overflow on the "+1" */
|
|
nrpages = end_index - start_index + 1;
|
|
if (!nrpages)
|
|
nrpages = ~0UL;
|
|
|
|
/*
|
|
* Ignore return value because fadvise() shall return
|
|
* success even if filesystem can't retrieve a hint,
|
|
*/
|
|
force_page_cache_readahead(mapping, f.file, start_index,
|
|
nrpages);
|
|
break;
|
|
case POSIX_FADV_NOREUSE:
|
|
break;
|
|
case POSIX_FADV_DONTNEED:
|
|
if (!bdi_write_congested(bdi))
|
|
__filemap_fdatawrite_range(mapping, offset, endbyte,
|
|
WB_SYNC_NONE);
|
|
|
|
/*
|
|
* First and last FULL page! Partial pages are deliberately
|
|
* preserved on the expectation that it is better to preserve
|
|
* needed memory than to discard unneeded memory.
|
|
*/
|
|
start_index = (offset+(PAGE_CACHE_SIZE-1)) >> PAGE_CACHE_SHIFT;
|
|
end_index = (endbyte >> PAGE_CACHE_SHIFT);
|
|
|
|
if (end_index >= start_index) {
|
|
unsigned long count = invalidate_mapping_pages(mapping,
|
|
start_index, end_index);
|
|
|
|
/*
|
|
* If fewer pages were invalidated than expected then
|
|
* it is possible that some of the pages were on
|
|
* a per-cpu pagevec for a remote CPU. Drain all
|
|
* pagevecs and try again.
|
|
*/
|
|
if (count < (end_index - start_index + 1)) {
|
|
lru_add_drain_all();
|
|
invalidate_mapping_pages(mapping, start_index,
|
|
end_index);
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
out:
|
|
fdput(f);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef __ARCH_WANT_SYS_FADVISE64
|
|
|
|
SYSCALL_DEFINE4(fadvise64, int, fd, loff_t, offset, size_t, len, int, advice)
|
|
{
|
|
return sys_fadvise64_64(fd, offset, len, advice);
|
|
}
|
|
|
|
#endif
|