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mm/fadvise.c
3.54 KB
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/* * mm/fadvise.c * * Copyright (C) 2002, Linus Torvalds * |
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* 11Jan2003 Andrew Morton |
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* 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> |
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#include <linux/writeback.h> |
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#include <linux/syscalls.h> #include <asm/unistd.h> /* * POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could * deactivate the pages and clear PG_Referenced. */ |
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SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice) |
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{ struct file *file = fget(fd); struct address_space *mapping; struct backing_dev_info *bdi; |
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loff_t endbyte; /* inclusive */ |
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pgoff_t start_index; pgoff_t end_index; unsigned long nrpages; int ret = 0; if (!file) return -EBADF; |
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if (S_ISFIFO(file->f_path.dentry->d_inode->i_mode)) { |
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ret = -ESPIPE; goto out; } |
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mapping = file->f_mapping; if (!mapping || len < 0) { ret = -EINVAL; goto out; } |
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if (mapping->a_ops->get_xip_mem) { |
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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; } |
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goto out; |
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} |
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/* Careful about overflows. Len == 0 means "as much as possible" */ endbyte = offset + len; if (!len || endbyte < len) endbyte = -1; |
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else endbyte--; /* inclusive */ |
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bdi = mapping->backing_dev_info; switch (advice) { case POSIX_FADV_NORMAL: file->f_ra.ra_pages = bdi->ra_pages; |
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spin_lock(&file->f_lock); file->f_mode &= ~FMODE_RANDOM; spin_unlock(&file->f_lock); |
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break; case POSIX_FADV_RANDOM: |
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spin_lock(&file->f_lock); file->f_mode |= FMODE_RANDOM; spin_unlock(&file->f_lock); |
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break; case POSIX_FADV_SEQUENTIAL: file->f_ra.ra_pages = bdi->ra_pages * 2; |
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spin_lock(&file->f_lock); file->f_mode &= ~FMODE_RANDOM; spin_unlock(&file->f_lock); |
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break; case POSIX_FADV_WILLNEED: |
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if (!mapping->a_ops->readpage) { ret = -EINVAL; break; } /* First and last PARTIAL page! */ 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" */ nrpages = end_index - start_index + 1; if (!nrpages) nrpages = ~0UL; ret = force_page_cache_readahead(mapping, file, start_index, |
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nrpages); |
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if (ret > 0) ret = 0; break; |
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case POSIX_FADV_NOREUSE: break; |
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case POSIX_FADV_DONTNEED: if (!bdi_write_congested(mapping->backing_dev_info)) filemap_flush(mapping); /* 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) invalidate_mapping_pages(mapping, start_index, end_index); break; |
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default: ret = -EINVAL; } out: fput(file); return ret; } |
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#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS asmlinkage long SyS_fadvise64_64(long fd, loff_t offset, loff_t len, long advice) { return SYSC_fadvise64_64((int) fd, offset, len, (int) advice); } SYSCALL_ALIAS(sys_fadvise64_64, SyS_fadvise64_64); #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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{ return sys_fadvise64_64(fd, offset, len, advice); } |
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#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS asmlinkage long SyS_fadvise64(long fd, loff_t offset, long len, long advice) { return SYSC_fadvise64((int) fd, offset, (size_t)len, (int)advice); } SYSCALL_ALIAS(sys_fadvise64, SyS_fadvise64); #endif |
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#endif |