diff options
Diffstat (limited to 'fs/ramfs/file-nommu.c')
| -rw-r--r-- | fs/ramfs/file-nommu.c | 81 |
1 files changed, 43 insertions, 38 deletions
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c index 3ac1f2387083..77b8ca2757e0 100644 --- a/fs/ramfs/file-nommu.c +++ b/fs/ramfs/file-nommu.c @@ -1,12 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* file-nommu.c: no-MMU version of ramfs * * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. */ #include <linux/module.h> @@ -26,13 +22,13 @@ #include <linux/uaccess.h> #include "internal.h" -static int ramfs_nommu_setattr(struct dentry *, struct iattr *); +static int ramfs_nommu_setattr(struct mnt_idmap *, struct dentry *, struct iattr *); static unsigned long ramfs_nommu_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags); -static int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma); +static int ramfs_nommu_mmap_prepare(struct vm_area_desc *desc); static unsigned ramfs_mmap_capabilities(struct file *file) { @@ -42,12 +38,12 @@ static unsigned ramfs_mmap_capabilities(struct file *file) const struct file_operations ramfs_file_operations = { .mmap_capabilities = ramfs_mmap_capabilities, - .mmap = ramfs_nommu_mmap, + .mmap_prepare = ramfs_nommu_mmap_prepare, .get_unmapped_area = ramfs_nommu_get_unmapped_area, .read_iter = generic_file_read_iter, .write_iter = generic_file_write_iter, .fsync = noop_fsync, - .splice_read = generic_file_splice_read, + .splice_read = filemap_splice_read, .splice_write = iter_file_splice_write, .llseek = generic_file_llseek, }; @@ -74,7 +70,7 @@ int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize) /* make various checks */ order = get_order(newsize); - if (unlikely(order >= MAX_ORDER)) + if (unlikely(order > MAX_PAGE_ORDER)) return -EFBIG; ret = inode_newsize_ok(inode, newsize); @@ -162,14 +158,15 @@ static int ramfs_nommu_resize(struct inode *inode, loff_t newsize, loff_t size) * handle a change of attributes * - we're specifically interested in a change of size */ -static int ramfs_nommu_setattr(struct dentry *dentry, struct iattr *ia) +static int ramfs_nommu_setattr(struct mnt_idmap *idmap, + struct dentry *dentry, struct iattr *ia) { struct inode *inode = d_inode(dentry); unsigned int old_ia_valid = ia->ia_valid; int ret = 0; /* POSIX UID/GID verification for setting inode attributes */ - ret = setattr_prepare(dentry, ia); + ret = setattr_prepare(&nop_mnt_idmap, dentry, ia); if (ret) return ret; @@ -189,7 +186,7 @@ static int ramfs_nommu_setattr(struct dentry *dentry, struct iattr *ia) } } - setattr_copy(inode, ia); + setattr_copy(&nop_mnt_idmap, inode, ia); out: ia->ia_valid = old_ia_valid; return ret; @@ -206,9 +203,9 @@ static unsigned long ramfs_nommu_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { - unsigned long maxpages, lpages, nr, loop, ret; + unsigned long maxpages, lpages, nr_folios, loop, ret, nr_pages, pfn; struct inode *inode = file_inode(file); - struct page **pages = NULL, **ptr, *page; + struct folio_batch fbatch; loff_t isize; /* the mapping mustn't extend beyond the EOF */ @@ -224,31 +221,39 @@ static unsigned long ramfs_nommu_get_unmapped_area(struct file *file, goto out; /* gang-find the pages */ - pages = kcalloc(lpages, sizeof(struct page *), GFP_KERNEL); - if (!pages) - goto out_free; - - nr = find_get_pages(inode->i_mapping, &pgoff, lpages, pages); - if (nr != lpages) - goto out_free_pages; /* leave if some pages were missing */ + folio_batch_init(&fbatch); + nr_pages = 0; +repeat: + nr_folios = filemap_get_folios_contig(inode->i_mapping, &pgoff, + ULONG_MAX, &fbatch); + if (!nr_folios) { + ret = -ENOSYS; + return ret; + } + if (ret == -ENOSYS) { + ret = (unsigned long) folio_address(fbatch.folios[0]); + pfn = folio_pfn(fbatch.folios[0]); + } /* check the pages for physical adjacency */ - ptr = pages; - page = *ptr++; - page++; - for (loop = lpages; loop > 1; loop--) - if (*ptr++ != page++) - goto out_free_pages; + for (loop = 0; loop < nr_folios; loop++) { + if (pfn + nr_pages != folio_pfn(fbatch.folios[loop])) { + ret = -ENOSYS; + goto out_free; /* leave if not physical adjacent */ + } + nr_pages += folio_nr_pages(fbatch.folios[loop]); + if (nr_pages >= lpages) + goto out_free; /* successfully found desired pages*/ + } + if (nr_pages < lpages) { + folio_batch_release(&fbatch); + goto repeat; /* loop if pages are missing */ + } /* okay - all conditions fulfilled */ - ret = (unsigned long) page_address(pages[0]); -out_free_pages: - ptr = pages; - for (loop = nr; loop > 0; loop--) - put_page(*ptr++); out_free: - kfree(pages); + folio_batch_release(&fbatch); out: return ret; } @@ -257,12 +262,12 @@ out: /* * set up a mapping for shared memory segments */ -static int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma) +static int ramfs_nommu_mmap_prepare(struct vm_area_desc *desc) { - if (!(vma->vm_flags & (VM_SHARED | VM_MAYSHARE))) + if (!is_nommu_shared_mapping(desc->vm_flags)) return -ENOSYS; - file_accessed(file); - vma->vm_ops = &generic_file_vm_ops; + file_accessed(desc->file); + desc->vm_ops = &generic_file_vm_ops; return 0; } |