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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
726 lines
18 KiB
C
726 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/ext2/dir.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/dir.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* ext2 directory handling functions
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*
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* Big-endian to little-endian byte-swapping/bitmaps by
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* David S. Miller (davem@caip.rutgers.edu), 1995
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*
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* All code that works with directory layout had been switched to pagecache
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* and moved here. AV
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*/
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#include "ext2.h"
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#include <linux/buffer_head.h>
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#include <linux/pagemap.h>
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#include <linux/swap.h>
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typedef struct ext2_dir_entry_2 ext2_dirent;
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/*
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* Tests against MAX_REC_LEN etc were put in place for 64k block
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* sizes; if that is not possible on this arch, we can skip
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* those tests and speed things up.
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*/
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static inline unsigned ext2_rec_len_from_disk(__le16 dlen)
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{
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unsigned len = le16_to_cpu(dlen);
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#if (PAGE_SIZE >= 65536)
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if (len == EXT2_MAX_REC_LEN)
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return 1 << 16;
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#endif
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return len;
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}
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static inline __le16 ext2_rec_len_to_disk(unsigned len)
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{
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#if (PAGE_SIZE >= 65536)
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if (len == (1 << 16))
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return cpu_to_le16(EXT2_MAX_REC_LEN);
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else
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BUG_ON(len > (1 << 16));
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#endif
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return cpu_to_le16(len);
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}
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/*
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* ext2 uses block-sized chunks. Arguably, sector-sized ones would be
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* more robust, but we have what we have
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*/
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static inline unsigned ext2_chunk_size(struct inode *inode)
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{
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return inode->i_sb->s_blocksize;
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}
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static inline void ext2_put_page(struct page *page)
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{
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kunmap(page);
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put_page(page);
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}
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/*
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* Return the offset into page `page_nr' of the last valid
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* byte in that page, plus one.
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*/
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static unsigned
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ext2_last_byte(struct inode *inode, unsigned long page_nr)
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{
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unsigned last_byte = inode->i_size;
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last_byte -= page_nr << PAGE_SHIFT;
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if (last_byte > PAGE_SIZE)
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last_byte = PAGE_SIZE;
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return last_byte;
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}
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static int ext2_commit_chunk(struct page *page, loff_t pos, unsigned len)
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{
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struct address_space *mapping = page->mapping;
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struct inode *dir = mapping->host;
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int err = 0;
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dir->i_version++;
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block_write_end(NULL, mapping, pos, len, len, page, NULL);
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if (pos+len > dir->i_size) {
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i_size_write(dir, pos+len);
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mark_inode_dirty(dir);
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}
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if (IS_DIRSYNC(dir)) {
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err = write_one_page(page);
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if (!err)
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err = sync_inode_metadata(dir, 1);
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} else {
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unlock_page(page);
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}
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return err;
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}
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static bool ext2_check_page(struct page *page, int quiet)
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{
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struct inode *dir = page->mapping->host;
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struct super_block *sb = dir->i_sb;
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unsigned chunk_size = ext2_chunk_size(dir);
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char *kaddr = page_address(page);
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u32 max_inumber = le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count);
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unsigned offs, rec_len;
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unsigned limit = PAGE_SIZE;
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ext2_dirent *p;
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char *error;
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if ((dir->i_size >> PAGE_SHIFT) == page->index) {
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limit = dir->i_size & ~PAGE_MASK;
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if (limit & (chunk_size - 1))
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goto Ebadsize;
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if (!limit)
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goto out;
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}
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for (offs = 0; offs <= limit - EXT2_DIR_REC_LEN(1); offs += rec_len) {
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p = (ext2_dirent *)(kaddr + offs);
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rec_len = ext2_rec_len_from_disk(p->rec_len);
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if (unlikely(rec_len < EXT2_DIR_REC_LEN(1)))
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goto Eshort;
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if (unlikely(rec_len & 3))
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goto Ealign;
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if (unlikely(rec_len < EXT2_DIR_REC_LEN(p->name_len)))
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goto Enamelen;
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if (unlikely(((offs + rec_len - 1) ^ offs) & ~(chunk_size-1)))
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goto Espan;
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if (unlikely(le32_to_cpu(p->inode) > max_inumber))
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goto Einumber;
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}
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if (offs != limit)
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goto Eend;
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out:
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SetPageChecked(page);
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return true;
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/* Too bad, we had an error */
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Ebadsize:
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if (!quiet)
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ext2_error(sb, __func__,
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"size of directory #%lu is not a multiple "
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"of chunk size", dir->i_ino);
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goto fail;
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Eshort:
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error = "rec_len is smaller than minimal";
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goto bad_entry;
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Ealign:
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error = "unaligned directory entry";
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goto bad_entry;
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Enamelen:
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error = "rec_len is too small for name_len";
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goto bad_entry;
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Espan:
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error = "directory entry across blocks";
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goto bad_entry;
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Einumber:
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error = "inode out of bounds";
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bad_entry:
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if (!quiet)
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ext2_error(sb, __func__, "bad entry in directory #%lu: : %s - "
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"offset=%lu, inode=%lu, rec_len=%d, name_len=%d",
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dir->i_ino, error, (page->index<<PAGE_SHIFT)+offs,
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(unsigned long) le32_to_cpu(p->inode),
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rec_len, p->name_len);
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goto fail;
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Eend:
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if (!quiet) {
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p = (ext2_dirent *)(kaddr + offs);
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ext2_error(sb, "ext2_check_page",
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"entry in directory #%lu spans the page boundary"
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"offset=%lu, inode=%lu",
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dir->i_ino, (page->index<<PAGE_SHIFT)+offs,
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(unsigned long) le32_to_cpu(p->inode));
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}
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fail:
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SetPageError(page);
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return false;
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}
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static struct page * ext2_get_page(struct inode *dir, unsigned long n,
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int quiet)
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{
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struct address_space *mapping = dir->i_mapping;
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struct page *page = read_mapping_page(mapping, n, NULL);
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if (!IS_ERR(page)) {
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kmap(page);
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if (unlikely(!PageChecked(page))) {
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if (PageError(page) || !ext2_check_page(page, quiet))
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goto fail;
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}
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}
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return page;
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fail:
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ext2_put_page(page);
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return ERR_PTR(-EIO);
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}
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/*
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* NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
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*
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* len <= EXT2_NAME_LEN and de != NULL are guaranteed by caller.
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*/
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static inline int ext2_match (int len, const char * const name,
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struct ext2_dir_entry_2 * de)
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{
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if (len != de->name_len)
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return 0;
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if (!de->inode)
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return 0;
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return !memcmp(name, de->name, len);
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}
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/*
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* p is at least 6 bytes before the end of page
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*/
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static inline ext2_dirent *ext2_next_entry(ext2_dirent *p)
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{
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return (ext2_dirent *)((char *)p +
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ext2_rec_len_from_disk(p->rec_len));
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}
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static inline unsigned
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ext2_validate_entry(char *base, unsigned offset, unsigned mask)
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{
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ext2_dirent *de = (ext2_dirent*)(base + offset);
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ext2_dirent *p = (ext2_dirent*)(base + (offset&mask));
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while ((char*)p < (char*)de) {
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if (p->rec_len == 0)
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break;
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p = ext2_next_entry(p);
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}
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return (char *)p - base;
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}
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static unsigned char ext2_filetype_table[EXT2_FT_MAX] = {
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[EXT2_FT_UNKNOWN] = DT_UNKNOWN,
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[EXT2_FT_REG_FILE] = DT_REG,
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[EXT2_FT_DIR] = DT_DIR,
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[EXT2_FT_CHRDEV] = DT_CHR,
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[EXT2_FT_BLKDEV] = DT_BLK,
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[EXT2_FT_FIFO] = DT_FIFO,
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[EXT2_FT_SOCK] = DT_SOCK,
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[EXT2_FT_SYMLINK] = DT_LNK,
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};
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#define S_SHIFT 12
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static unsigned char ext2_type_by_mode[S_IFMT >> S_SHIFT] = {
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[S_IFREG >> S_SHIFT] = EXT2_FT_REG_FILE,
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[S_IFDIR >> S_SHIFT] = EXT2_FT_DIR,
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[S_IFCHR >> S_SHIFT] = EXT2_FT_CHRDEV,
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[S_IFBLK >> S_SHIFT] = EXT2_FT_BLKDEV,
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[S_IFIFO >> S_SHIFT] = EXT2_FT_FIFO,
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[S_IFSOCK >> S_SHIFT] = EXT2_FT_SOCK,
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[S_IFLNK >> S_SHIFT] = EXT2_FT_SYMLINK,
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};
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static inline void ext2_set_de_type(ext2_dirent *de, struct inode *inode)
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{
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umode_t mode = inode->i_mode;
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if (EXT2_HAS_INCOMPAT_FEATURE(inode->i_sb, EXT2_FEATURE_INCOMPAT_FILETYPE))
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de->file_type = ext2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
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else
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de->file_type = 0;
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}
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static int
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ext2_readdir(struct file *file, struct dir_context *ctx)
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{
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loff_t pos = ctx->pos;
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struct inode *inode = file_inode(file);
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struct super_block *sb = inode->i_sb;
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unsigned int offset = pos & ~PAGE_MASK;
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unsigned long n = pos >> PAGE_SHIFT;
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unsigned long npages = dir_pages(inode);
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unsigned chunk_mask = ~(ext2_chunk_size(inode)-1);
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unsigned char *types = NULL;
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int need_revalidate = file->f_version != inode->i_version;
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if (pos > inode->i_size - EXT2_DIR_REC_LEN(1))
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return 0;
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if (EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_FILETYPE))
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types = ext2_filetype_table;
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for ( ; n < npages; n++, offset = 0) {
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char *kaddr, *limit;
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ext2_dirent *de;
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struct page *page = ext2_get_page(inode, n, 0);
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if (IS_ERR(page)) {
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ext2_error(sb, __func__,
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"bad page in #%lu",
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inode->i_ino);
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ctx->pos += PAGE_SIZE - offset;
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return PTR_ERR(page);
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}
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kaddr = page_address(page);
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if (unlikely(need_revalidate)) {
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if (offset) {
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offset = ext2_validate_entry(kaddr, offset, chunk_mask);
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ctx->pos = (n<<PAGE_SHIFT) + offset;
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}
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file->f_version = inode->i_version;
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need_revalidate = 0;
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}
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de = (ext2_dirent *)(kaddr+offset);
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limit = kaddr + ext2_last_byte(inode, n) - EXT2_DIR_REC_LEN(1);
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for ( ;(char*)de <= limit; de = ext2_next_entry(de)) {
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if (de->rec_len == 0) {
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ext2_error(sb, __func__,
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"zero-length directory entry");
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ext2_put_page(page);
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return -EIO;
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}
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if (de->inode) {
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unsigned char d_type = DT_UNKNOWN;
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if (types && de->file_type < EXT2_FT_MAX)
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d_type = types[de->file_type];
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if (!dir_emit(ctx, de->name, de->name_len,
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le32_to_cpu(de->inode),
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d_type)) {
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ext2_put_page(page);
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return 0;
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}
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}
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ctx->pos += ext2_rec_len_from_disk(de->rec_len);
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}
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ext2_put_page(page);
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}
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return 0;
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}
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/*
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* ext2_find_entry()
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*
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* finds an entry in the specified directory with the wanted name. It
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* returns the page in which the entry was found (as a parameter - res_page),
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* and the entry itself. Page is returned mapped and unlocked.
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* Entry is guaranteed to be valid.
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*/
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struct ext2_dir_entry_2 *ext2_find_entry (struct inode *dir,
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const struct qstr *child, struct page **res_page)
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{
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const char *name = child->name;
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int namelen = child->len;
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unsigned reclen = EXT2_DIR_REC_LEN(namelen);
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unsigned long start, n;
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unsigned long npages = dir_pages(dir);
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struct page *page = NULL;
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struct ext2_inode_info *ei = EXT2_I(dir);
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ext2_dirent * de;
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int dir_has_error = 0;
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if (npages == 0)
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goto out;
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/* OFFSET_CACHE */
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*res_page = NULL;
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start = ei->i_dir_start_lookup;
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if (start >= npages)
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start = 0;
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n = start;
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do {
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char *kaddr;
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page = ext2_get_page(dir, n, dir_has_error);
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if (!IS_ERR(page)) {
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kaddr = page_address(page);
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de = (ext2_dirent *) kaddr;
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kaddr += ext2_last_byte(dir, n) - reclen;
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while ((char *) de <= kaddr) {
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if (de->rec_len == 0) {
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ext2_error(dir->i_sb, __func__,
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"zero-length directory entry");
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ext2_put_page(page);
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goto out;
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}
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if (ext2_match (namelen, name, de))
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goto found;
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de = ext2_next_entry(de);
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}
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ext2_put_page(page);
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} else
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dir_has_error = 1;
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if (++n >= npages)
|
|
n = 0;
|
|
/* next page is past the blocks we've got */
|
|
if (unlikely(n > (dir->i_blocks >> (PAGE_SHIFT - 9)))) {
|
|
ext2_error(dir->i_sb, __func__,
|
|
"dir %lu size %lld exceeds block count %llu",
|
|
dir->i_ino, dir->i_size,
|
|
(unsigned long long)dir->i_blocks);
|
|
goto out;
|
|
}
|
|
} while (n != start);
|
|
out:
|
|
return NULL;
|
|
|
|
found:
|
|
*res_page = page;
|
|
ei->i_dir_start_lookup = n;
|
|
return de;
|
|
}
|
|
|
|
struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p)
|
|
{
|
|
struct page *page = ext2_get_page(dir, 0, 0);
|
|
ext2_dirent *de = NULL;
|
|
|
|
if (!IS_ERR(page)) {
|
|
de = ext2_next_entry((ext2_dirent *) page_address(page));
|
|
*p = page;
|
|
}
|
|
return de;
|
|
}
|
|
|
|
ino_t ext2_inode_by_name(struct inode *dir, const struct qstr *child)
|
|
{
|
|
ino_t res = 0;
|
|
struct ext2_dir_entry_2 *de;
|
|
struct page *page;
|
|
|
|
de = ext2_find_entry (dir, child, &page);
|
|
if (de) {
|
|
res = le32_to_cpu(de->inode);
|
|
ext2_put_page(page);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static int ext2_prepare_chunk(struct page *page, loff_t pos, unsigned len)
|
|
{
|
|
return __block_write_begin(page, pos, len, ext2_get_block);
|
|
}
|
|
|
|
/* Releases the page */
|
|
void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
|
|
struct page *page, struct inode *inode, int update_times)
|
|
{
|
|
loff_t pos = page_offset(page) +
|
|
(char *) de - (char *) page_address(page);
|
|
unsigned len = ext2_rec_len_from_disk(de->rec_len);
|
|
int err;
|
|
|
|
lock_page(page);
|
|
err = ext2_prepare_chunk(page, pos, len);
|
|
BUG_ON(err);
|
|
de->inode = cpu_to_le32(inode->i_ino);
|
|
ext2_set_de_type(de, inode);
|
|
err = ext2_commit_chunk(page, pos, len);
|
|
ext2_put_page(page);
|
|
if (update_times)
|
|
dir->i_mtime = dir->i_ctime = current_time(dir);
|
|
EXT2_I(dir)->i_flags &= ~EXT2_BTREE_FL;
|
|
mark_inode_dirty(dir);
|
|
}
|
|
|
|
/*
|
|
* Parent is locked.
|
|
*/
|
|
int ext2_add_link (struct dentry *dentry, struct inode *inode)
|
|
{
|
|
struct inode *dir = d_inode(dentry->d_parent);
|
|
const char *name = dentry->d_name.name;
|
|
int namelen = dentry->d_name.len;
|
|
unsigned chunk_size = ext2_chunk_size(dir);
|
|
unsigned reclen = EXT2_DIR_REC_LEN(namelen);
|
|
unsigned short rec_len, name_len;
|
|
struct page *page = NULL;
|
|
ext2_dirent * de;
|
|
unsigned long npages = dir_pages(dir);
|
|
unsigned long n;
|
|
char *kaddr;
|
|
loff_t pos;
|
|
int err;
|
|
|
|
/*
|
|
* We take care of directory expansion in the same loop.
|
|
* This code plays outside i_size, so it locks the page
|
|
* to protect that region.
|
|
*/
|
|
for (n = 0; n <= npages; n++) {
|
|
char *dir_end;
|
|
|
|
page = ext2_get_page(dir, n, 0);
|
|
err = PTR_ERR(page);
|
|
if (IS_ERR(page))
|
|
goto out;
|
|
lock_page(page);
|
|
kaddr = page_address(page);
|
|
dir_end = kaddr + ext2_last_byte(dir, n);
|
|
de = (ext2_dirent *)kaddr;
|
|
kaddr += PAGE_SIZE - reclen;
|
|
while ((char *)de <= kaddr) {
|
|
if ((char *)de == dir_end) {
|
|
/* We hit i_size */
|
|
name_len = 0;
|
|
rec_len = chunk_size;
|
|
de->rec_len = ext2_rec_len_to_disk(chunk_size);
|
|
de->inode = 0;
|
|
goto got_it;
|
|
}
|
|
if (de->rec_len == 0) {
|
|
ext2_error(dir->i_sb, __func__,
|
|
"zero-length directory entry");
|
|
err = -EIO;
|
|
goto out_unlock;
|
|
}
|
|
err = -EEXIST;
|
|
if (ext2_match (namelen, name, de))
|
|
goto out_unlock;
|
|
name_len = EXT2_DIR_REC_LEN(de->name_len);
|
|
rec_len = ext2_rec_len_from_disk(de->rec_len);
|
|
if (!de->inode && rec_len >= reclen)
|
|
goto got_it;
|
|
if (rec_len >= name_len + reclen)
|
|
goto got_it;
|
|
de = (ext2_dirent *) ((char *) de + rec_len);
|
|
}
|
|
unlock_page(page);
|
|
ext2_put_page(page);
|
|
}
|
|
BUG();
|
|
return -EINVAL;
|
|
|
|
got_it:
|
|
pos = page_offset(page) +
|
|
(char*)de - (char*)page_address(page);
|
|
err = ext2_prepare_chunk(page, pos, rec_len);
|
|
if (err)
|
|
goto out_unlock;
|
|
if (de->inode) {
|
|
ext2_dirent *de1 = (ext2_dirent *) ((char *) de + name_len);
|
|
de1->rec_len = ext2_rec_len_to_disk(rec_len - name_len);
|
|
de->rec_len = ext2_rec_len_to_disk(name_len);
|
|
de = de1;
|
|
}
|
|
de->name_len = namelen;
|
|
memcpy(de->name, name, namelen);
|
|
de->inode = cpu_to_le32(inode->i_ino);
|
|
ext2_set_de_type (de, inode);
|
|
err = ext2_commit_chunk(page, pos, rec_len);
|
|
dir->i_mtime = dir->i_ctime = current_time(dir);
|
|
EXT2_I(dir)->i_flags &= ~EXT2_BTREE_FL;
|
|
mark_inode_dirty(dir);
|
|
/* OFFSET_CACHE */
|
|
out_put:
|
|
ext2_put_page(page);
|
|
out:
|
|
return err;
|
|
out_unlock:
|
|
unlock_page(page);
|
|
goto out_put;
|
|
}
|
|
|
|
/*
|
|
* ext2_delete_entry deletes a directory entry by merging it with the
|
|
* previous entry. Page is up-to-date. Releases the page.
|
|
*/
|
|
int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page )
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
char *kaddr = page_address(page);
|
|
unsigned from = ((char*)dir - kaddr) & ~(ext2_chunk_size(inode)-1);
|
|
unsigned to = ((char *)dir - kaddr) +
|
|
ext2_rec_len_from_disk(dir->rec_len);
|
|
loff_t pos;
|
|
ext2_dirent * pde = NULL;
|
|
ext2_dirent * de = (ext2_dirent *) (kaddr + from);
|
|
int err;
|
|
|
|
while ((char*)de < (char*)dir) {
|
|
if (de->rec_len == 0) {
|
|
ext2_error(inode->i_sb, __func__,
|
|
"zero-length directory entry");
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
pde = de;
|
|
de = ext2_next_entry(de);
|
|
}
|
|
if (pde)
|
|
from = (char*)pde - (char*)page_address(page);
|
|
pos = page_offset(page) + from;
|
|
lock_page(page);
|
|
err = ext2_prepare_chunk(page, pos, to - from);
|
|
BUG_ON(err);
|
|
if (pde)
|
|
pde->rec_len = ext2_rec_len_to_disk(to - from);
|
|
dir->inode = 0;
|
|
err = ext2_commit_chunk(page, pos, to - from);
|
|
inode->i_ctime = inode->i_mtime = current_time(inode);
|
|
EXT2_I(inode)->i_flags &= ~EXT2_BTREE_FL;
|
|
mark_inode_dirty(inode);
|
|
out:
|
|
ext2_put_page(page);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Set the first fragment of directory.
|
|
*/
|
|
int ext2_make_empty(struct inode *inode, struct inode *parent)
|
|
{
|
|
struct page *page = grab_cache_page(inode->i_mapping, 0);
|
|
unsigned chunk_size = ext2_chunk_size(inode);
|
|
struct ext2_dir_entry_2 * de;
|
|
int err;
|
|
void *kaddr;
|
|
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
err = ext2_prepare_chunk(page, 0, chunk_size);
|
|
if (err) {
|
|
unlock_page(page);
|
|
goto fail;
|
|
}
|
|
kaddr = kmap_atomic(page);
|
|
memset(kaddr, 0, chunk_size);
|
|
de = (struct ext2_dir_entry_2 *)kaddr;
|
|
de->name_len = 1;
|
|
de->rec_len = ext2_rec_len_to_disk(EXT2_DIR_REC_LEN(1));
|
|
memcpy (de->name, ".\0\0", 4);
|
|
de->inode = cpu_to_le32(inode->i_ino);
|
|
ext2_set_de_type (de, inode);
|
|
|
|
de = (struct ext2_dir_entry_2 *)(kaddr + EXT2_DIR_REC_LEN(1));
|
|
de->name_len = 2;
|
|
de->rec_len = ext2_rec_len_to_disk(chunk_size - EXT2_DIR_REC_LEN(1));
|
|
de->inode = cpu_to_le32(parent->i_ino);
|
|
memcpy (de->name, "..\0", 4);
|
|
ext2_set_de_type (de, inode);
|
|
kunmap_atomic(kaddr);
|
|
err = ext2_commit_chunk(page, 0, chunk_size);
|
|
fail:
|
|
put_page(page);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* routine to check that the specified directory is empty (for rmdir)
|
|
*/
|
|
int ext2_empty_dir (struct inode * inode)
|
|
{
|
|
struct page *page = NULL;
|
|
unsigned long i, npages = dir_pages(inode);
|
|
int dir_has_error = 0;
|
|
|
|
for (i = 0; i < npages; i++) {
|
|
char *kaddr;
|
|
ext2_dirent * de;
|
|
page = ext2_get_page(inode, i, dir_has_error);
|
|
|
|
if (IS_ERR(page)) {
|
|
dir_has_error = 1;
|
|
continue;
|
|
}
|
|
|
|
kaddr = page_address(page);
|
|
de = (ext2_dirent *)kaddr;
|
|
kaddr += ext2_last_byte(inode, i) - EXT2_DIR_REC_LEN(1);
|
|
|
|
while ((char *)de <= kaddr) {
|
|
if (de->rec_len == 0) {
|
|
ext2_error(inode->i_sb, __func__,
|
|
"zero-length directory entry");
|
|
printk("kaddr=%p, de=%p\n", kaddr, de);
|
|
goto not_empty;
|
|
}
|
|
if (de->inode != 0) {
|
|
/* check for . and .. */
|
|
if (de->name[0] != '.')
|
|
goto not_empty;
|
|
if (de->name_len > 2)
|
|
goto not_empty;
|
|
if (de->name_len < 2) {
|
|
if (de->inode !=
|
|
cpu_to_le32(inode->i_ino))
|
|
goto not_empty;
|
|
} else if (de->name[1] != '.')
|
|
goto not_empty;
|
|
}
|
|
de = ext2_next_entry(de);
|
|
}
|
|
ext2_put_page(page);
|
|
}
|
|
return 1;
|
|
|
|
not_empty:
|
|
ext2_put_page(page);
|
|
return 0;
|
|
}
|
|
|
|
const struct file_operations ext2_dir_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.read = generic_read_dir,
|
|
.iterate_shared = ext2_readdir,
|
|
.unlocked_ioctl = ext2_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = ext2_compat_ioctl,
|
|
#endif
|
|
.fsync = ext2_fsync,
|
|
};
|