2b4b2482e7
romfs_get_unmapped_area() checks argument `len' without considering
PAGE_ALIGN which will cause do_mmap_pgoff() return -EINVAL error after
commit f67d9b1576 ("nommu: add page_align to mmap").
Fix the check by changing it in same way ramfs_nommu_get_unmapped_area()
was changed in ramfs/file-nommu.c.
Signed-off-by: Bob Liu <lliubbo@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Acked-by: Greg Ungerer <gerg@snapgear.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/* NOMMU mmap support for RomFS on MTD devices
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*
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* Copyright © 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/mm.h>
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#include <linux/mtd/super.h>
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#include "internal.h"
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/*
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* try to determine where a shared mapping can be made
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* - only supported for NOMMU at the moment (MMU can't doesn't copy private
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* mappings)
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* - attempts to map through to the underlying MTD device
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*/
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static unsigned long romfs_get_unmapped_area(struct file *file,
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unsigned long addr,
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unsigned long len,
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unsigned long pgoff,
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unsigned long flags)
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{
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struct inode *inode = file->f_mapping->host;
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struct mtd_info *mtd = inode->i_sb->s_mtd;
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unsigned long isize, offset, maxpages, lpages;
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if (!mtd)
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goto cant_map_directly;
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/* the mapping mustn't extend beyond the EOF */
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lpages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
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isize = i_size_read(inode);
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offset = pgoff << PAGE_SHIFT;
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maxpages = (isize + PAGE_SIZE - 1) >> PAGE_SHIFT;
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if ((pgoff >= maxpages) || (maxpages - pgoff < lpages))
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return (unsigned long) -EINVAL;
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/* we need to call down to the MTD layer to do the actual mapping */
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if (mtd->get_unmapped_area) {
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if (addr != 0)
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return (unsigned long) -EINVAL;
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if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
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return (unsigned long) -EINVAL;
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offset += ROMFS_I(inode)->i_dataoffset;
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if (offset > mtd->size - len)
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return (unsigned long) -EINVAL;
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return mtd->get_unmapped_area(mtd, len, offset, flags);
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}
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cant_map_directly:
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return (unsigned long) -ENOSYS;
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}
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/*
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* permit a R/O mapping to be made directly through onto an MTD device if
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* possible
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*/
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static int romfs_mmap(struct file *file, struct vm_area_struct *vma)
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{
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return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -ENOSYS;
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}
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const struct file_operations romfs_ro_fops = {
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.llseek = generic_file_llseek,
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.read = do_sync_read,
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.aio_read = generic_file_aio_read,
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.splice_read = generic_file_splice_read,
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.mmap = romfs_mmap,
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.get_unmapped_area = romfs_get_unmapped_area,
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};
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