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![Linus Torvalds](/assets/img/avatar_default.png)
Pull vfs pile (part one) from Al Viro: "Assorted stuff - cleaning namei.c up a bit, fixing ->d_name/->d_parent locking violations, etc. The most visible changes here are death of FS_REVAL_DOT (replaced with "has ->d_weak_revalidate()") and a new helper getting from struct file to inode. Some bits of preparation to xattr method interface changes. Misc patches by various people sent this cycle *and* ocfs2 fixes from several cycles ago that should've been upstream right then. PS: the next vfs pile will be xattr stuff." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (46 commits) saner proc_get_inode() calling conventions proc: avoid extra pde_put() in proc_fill_super() fs: change return values from -EACCES to -EPERM fs/exec.c: make bprm_mm_init() static ocfs2/dlm: use GFP_ATOMIC inside a spin_lock ocfs2: fix possible use-after-free with AIO ocfs2: Fix oops in ocfs2_fast_symlink_readpage() code path get_empty_filp()/alloc_file() leave both ->f_pos and ->f_version zero target: writev() on single-element vector is pointless export kernel_write(), convert open-coded instances fs: encode_fh: return FILEID_INVALID if invalid fid_type kill f_vfsmnt vfs: kill FS_REVAL_DOT by adding a d_weak_revalidate dentry op nfsd: handle vfs_getattr errors in acl protocol switch vfs_getattr() to struct path default SET_PERSONALITY() in linux/elf.h ceph: prepopulate inodes only when request is aborted d_hash_and_lookup(): export, switch open-coded instances 9p: switch v9fs_set_create_acl() to inode+fid, do it before d_instantiate() 9p: split dropping the acls from v9fs_set_create_acl() ...
170 lines
4 KiB
C
170 lines
4 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_DEFINE(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 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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if (S_ISFIFO(file_inode(f.file)->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 (mapping->a_ops->get_xip_mem) {
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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 = mapping->backing_dev_info;
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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(mapping->backing_dev_info))
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__filemap_fdatawrite_range(mapping, offset, endbyte,
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WB_SYNC_NONE);
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/* First and last FULL page! */
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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 CONFIG_HAVE_SYSCALL_WRAPPERS
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asmlinkage long SyS_fadvise64_64(long fd, loff_t offset, loff_t len, long advice)
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{
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return SYSC_fadvise64_64((int) fd, offset, len, (int) advice);
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}
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SYSCALL_ALIAS(sys_fadvise64_64, SyS_fadvise64_64);
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#endif
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#ifdef __ARCH_WANT_SYS_FADVISE64
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SYSCALL_DEFINE(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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#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
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asmlinkage long SyS_fadvise64(long fd, loff_t offset, long len, long advice)
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{
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return SYSC_fadvise64((int) fd, offset, (size_t)len, (int)advice);
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}
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SYSCALL_ALIAS(sys_fadvise64, SyS_fadvise64);
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#endif
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#endif
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