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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e748dcd095
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>
163 lines
3.7 KiB
C
163 lines
3.7 KiB
C
/*
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* mm/fadvise.c
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*
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* Copyright (C) 2002, Linus Torvalds
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*
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* 11Jan2003 Andrew Morton
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* Initial version.
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*/
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#include <linux/kernel.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/backing-dev.h>
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#include <linux/pagevec.h>
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#include <linux/fadvise.h>
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#include <linux/writeback.h>
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#include <linux/syscalls.h>
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#include <linux/swap.h>
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#include <asm/unistd.h>
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/*
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* POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could
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* deactivate the pages and clear PG_Referenced.
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*/
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SYSCALL_DEFINE4(fadvise64_64, int, fd, loff_t, offset, loff_t, len, int, advice)
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{
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struct fd f = fdget(fd);
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struct inode *inode;
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struct address_space *mapping;
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struct backing_dev_info *bdi;
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loff_t endbyte; /* inclusive */
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pgoff_t start_index;
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pgoff_t end_index;
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unsigned long nrpages;
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int ret = 0;
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if (!f.file)
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return -EBADF;
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inode = file_inode(f.file);
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if (S_ISFIFO(inode->i_mode)) {
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ret = -ESPIPE;
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goto out;
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}
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mapping = f.file->f_mapping;
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if (!mapping || len < 0) {
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ret = -EINVAL;
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goto out;
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}
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if (IS_DAX(inode)) {
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switch (advice) {
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case POSIX_FADV_NORMAL:
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case POSIX_FADV_RANDOM:
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case POSIX_FADV_SEQUENTIAL:
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case POSIX_FADV_WILLNEED:
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case POSIX_FADV_NOREUSE:
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case POSIX_FADV_DONTNEED:
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/* no bad return value, but ignore advice */
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break;
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default:
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ret = -EINVAL;
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}
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goto out;
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}
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/* Careful about overflows. Len == 0 means "as much as possible" */
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endbyte = offset + len;
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if (!len || endbyte < len)
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endbyte = -1;
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else
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endbyte--; /* inclusive */
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bdi = inode_to_bdi(mapping->host);
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switch (advice) {
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case POSIX_FADV_NORMAL:
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f.file->f_ra.ra_pages = bdi->ra_pages;
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spin_lock(&f.file->f_lock);
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f.file->f_mode &= ~FMODE_RANDOM;
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spin_unlock(&f.file->f_lock);
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break;
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case POSIX_FADV_RANDOM:
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spin_lock(&f.file->f_lock);
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f.file->f_mode |= FMODE_RANDOM;
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spin_unlock(&f.file->f_lock);
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break;
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case POSIX_FADV_SEQUENTIAL:
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f.file->f_ra.ra_pages = bdi->ra_pages * 2;
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spin_lock(&f.file->f_lock);
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f.file->f_mode &= ~FMODE_RANDOM;
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spin_unlock(&f.file->f_lock);
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break;
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case POSIX_FADV_WILLNEED:
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/* First and last PARTIAL page! */
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start_index = offset >> PAGE_CACHE_SHIFT;
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end_index = endbyte >> PAGE_CACHE_SHIFT;
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/* Careful about overflow on the "+1" */
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nrpages = end_index - start_index + 1;
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if (!nrpages)
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nrpages = ~0UL;
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/*
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* Ignore return value because fadvise() shall return
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* success even if filesystem can't retrieve a hint,
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*/
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force_page_cache_readahead(mapping, f.file, start_index,
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nrpages);
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break;
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case POSIX_FADV_NOREUSE:
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break;
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case POSIX_FADV_DONTNEED:
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if (!bdi_write_congested(bdi))
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__filemap_fdatawrite_range(mapping, offset, endbyte,
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WB_SYNC_NONE);
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/*
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* First and last FULL page! Partial pages are deliberately
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* preserved on the expectation that it is better to preserve
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* needed memory than to discard unneeded memory.
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*/
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start_index = (offset+(PAGE_CACHE_SIZE-1)) >> PAGE_CACHE_SHIFT;
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end_index = (endbyte >> PAGE_CACHE_SHIFT);
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if (end_index >= start_index) {
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unsigned long count = invalidate_mapping_pages(mapping,
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start_index, end_index);
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/*
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* If fewer pages were invalidated than expected then
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* it is possible that some of the pages were on
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* a per-cpu pagevec for a remote CPU. Drain all
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* pagevecs and try again.
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*/
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if (count < (end_index - start_index + 1)) {
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lru_add_drain_all();
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invalidate_mapping_pages(mapping, start_index,
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end_index);
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}
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}
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break;
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default:
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ret = -EINVAL;
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}
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out:
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fdput(f);
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return ret;
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}
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#ifdef __ARCH_WANT_SYS_FADVISE64
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SYSCALL_DEFINE4(fadvise64, int, fd, loff_t, offset, size_t, len, int, advice)
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{
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return sys_fadvise64_64(fd, offset, len, advice);
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}
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#endif
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