diff options
author | Paul Mundt <lethal@linux-sh.org> | 2009-09-25 12:15:15 +0900 |
---|---|---|
committer | Paul Mundt <lethal@linux-sh.org> | 2009-09-25 12:15:15 +0900 |
commit | c373ba999103fa794f041eab5bd490714d2dee88 (patch) | |
tree | 8f2b445b1e0af2491c83527967dbcda76054a486 /mm/nommu.c | |
parent | 6f3529f00a0a9ac06413d18d3926adf099cb59af (diff) | |
parent | 851b147e4411df6a1e7e90e2a609773c277eefd2 (diff) |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'mm/nommu.c')
-rw-r--r-- | mm/nommu.c | 82 |
1 files changed, 16 insertions, 66 deletions
diff --git a/mm/nommu.c b/mm/nommu.c index 8d484241d03..c73aa4753d7 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -83,46 +83,6 @@ struct vm_operations_struct generic_file_vm_ops = { }; /* - * Handle all mappings that got truncated by a "truncate()" - * system call. - * - * NOTE! We have to be ready to update the memory sharing - * between the file and the memory map for a potential last - * incomplete page. Ugly, but necessary. - */ -int vmtruncate(struct inode *inode, loff_t offset) -{ - struct address_space *mapping = inode->i_mapping; - unsigned long limit; - - if (inode->i_size < offset) - goto do_expand; - i_size_write(inode, offset); - - truncate_inode_pages(mapping, offset); - goto out_truncate; - -do_expand: - limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; - if (limit != RLIM_INFINITY && offset > limit) - goto out_sig; - if (offset > inode->i_sb->s_maxbytes) - goto out; - i_size_write(inode, offset); - -out_truncate: - if (inode->i_op->truncate) - inode->i_op->truncate(inode); - return 0; -out_sig: - send_sig(SIGXFSZ, current, 0); -out: - return -EFBIG; -} - -EXPORT_SYMBOL(vmtruncate); - -/* * Return the total memory allocated for this pointer, not * just what the caller asked for. * @@ -866,7 +826,7 @@ static int validate_mmap_request(struct file *file, int ret; /* do the simple checks first */ - if (flags & MAP_FIXED || addr) { + if (flags & MAP_FIXED) { printk(KERN_DEBUG "%d: Can't do fixed-address/overlay mmap of RAM\n", current->pid); @@ -1074,7 +1034,7 @@ static int do_mmap_shared_file(struct vm_area_struct *vma) ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); if (ret == 0) { vma->vm_region->vm_top = vma->vm_region->vm_end; - return ret; + return 0; } if (ret != -ENOSYS) return ret; @@ -1091,7 +1051,8 @@ static int do_mmap_shared_file(struct vm_area_struct *vma) */ static int do_mmap_private(struct vm_area_struct *vma, struct vm_region *region, - unsigned long len) + unsigned long len, + unsigned long capabilities) { struct page *pages; unsigned long total, point, n, rlen; @@ -1102,13 +1063,13 @@ static int do_mmap_private(struct vm_area_struct *vma, * shared mappings on devices or memory * - VM_MAYSHARE will be set if it may attempt to share */ - if (vma->vm_file) { + if (capabilities & BDI_CAP_MAP_DIRECT) { ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); if (ret == 0) { /* shouldn't return success if we're not sharing */ BUG_ON(!(vma->vm_flags & VM_MAYSHARE)); vma->vm_region->vm_top = vma->vm_region->vm_end; - return ret; + return 0; } if (ret != -ENOSYS) return ret; @@ -1221,9 +1182,6 @@ unsigned long do_mmap_pgoff(struct file *file, kenter(",%lx,%lx,%lx,%lx,%lx", addr, len, prot, flags, pgoff); - if (!(flags & MAP_FIXED)) - addr = round_hint_to_min(addr); - /* decide whether we should attempt the mapping, and if so what sort of * mapping */ ret = validate_mmap_request(file, addr, len, prot, flags, pgoff, @@ -1233,6 +1191,9 @@ unsigned long do_mmap_pgoff(struct file *file, return ret; } + /* we ignore the address hint */ + addr = 0; + /* we've determined that we can make the mapping, now translate what we * now know into VMA flags */ vm_flags = determine_vm_flags(file, prot, flags, capabilities); @@ -1346,7 +1307,7 @@ unsigned long do_mmap_pgoff(struct file *file, * - this is the hook for quasi-memory character devices to * tell us the location of a shared mapping */ - if (file && file->f_op->get_unmapped_area) { + if (capabilities & BDI_CAP_MAP_DIRECT) { addr = file->f_op->get_unmapped_area(file, addr, len, pgoff, flags); if (IS_ERR((void *) addr)) { @@ -1370,15 +1331,17 @@ unsigned long do_mmap_pgoff(struct file *file, } vma->vm_region = region; - add_nommu_region(region); - /* set up the mapping */ + /* set up the mapping + * - the region is filled in if BDI_CAP_MAP_DIRECT is still set + */ if (file && vma->vm_flags & VM_SHARED) ret = do_mmap_shared_file(vma); else - ret = do_mmap_private(vma, region, len); + ret = do_mmap_private(vma, region, len, capabilities); if (ret < 0) - goto error_put_region; + goto error_just_free; + add_nommu_region(region); /* okay... we have a mapping; now we have to register it */ result = vma->vm_start; @@ -1396,19 +1359,6 @@ share: kleave(" = %lx", result); return result; -error_put_region: - __put_nommu_region(region); - if (vma) { - if (vma->vm_file) { - fput(vma->vm_file); - if (vma->vm_flags & VM_EXECUTABLE) - removed_exe_file_vma(vma->vm_mm); - } - kmem_cache_free(vm_area_cachep, vma); - } - kleave(" = %d [pr]", ret); - return ret; - error_just_free: up_write(&nommu_region_sem); error: |