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679 lines
17 KiB
679 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* dir.c - NILFS directory entry operations |
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* |
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. |
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* |
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* Modified for NILFS by Amagai Yoshiji. |
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*/ |
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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 ([email protected]) |
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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 ([email protected]), 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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|
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#include <linux/pagemap.h> |
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#include "nilfs.h" |
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#include "page.h" |
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|
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static inline unsigned int nilfs_rec_len_from_disk(__le16 dlen) |
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{ |
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unsigned int len = le16_to_cpu(dlen); |
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|
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#if (PAGE_SIZE >= 65536) |
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if (len == NILFS_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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|
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static inline __le16 nilfs_rec_len_to_disk(unsigned int 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(NILFS_MAX_REC_LEN); |
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|
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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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/* |
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* nilfs 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 int nilfs_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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|
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static inline void nilfs_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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/* |
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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 int nilfs_last_byte(struct inode *inode, unsigned long page_nr) |
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{ |
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unsigned int last_byte = inode->i_size; |
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|
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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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|
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static int nilfs_prepare_chunk(struct page *page, unsigned int from, |
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unsigned int to) |
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{ |
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loff_t pos = page_offset(page) + from; |
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|
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return __block_write_begin(page, pos, to - from, nilfs_get_block); |
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} |
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|
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static void nilfs_commit_chunk(struct page *page, |
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struct address_space *mapping, |
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unsigned int from, unsigned int to) |
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{ |
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struct inode *dir = mapping->host; |
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loff_t pos = page_offset(page) + from; |
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unsigned int len = to - from; |
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unsigned int nr_dirty, copied; |
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int err; |
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nr_dirty = nilfs_page_count_clean_buffers(page, from, to); |
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copied = block_write_end(NULL, mapping, pos, len, len, page, NULL); |
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if (pos + copied > dir->i_size) |
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i_size_write(dir, pos + copied); |
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if (IS_DIRSYNC(dir)) |
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nilfs_set_transaction_flag(NILFS_TI_SYNC); |
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err = nilfs_set_file_dirty(dir, nr_dirty); |
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WARN_ON(err); /* do not happen */ |
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unlock_page(page); |
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} |
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|
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static bool nilfs_check_page(struct page *page) |
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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 int chunk_size = nilfs_chunk_size(dir); |
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char *kaddr = page_address(page); |
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unsigned int offs, rec_len; |
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unsigned int limit = PAGE_SIZE; |
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struct nilfs_dir_entry *p; |
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char *error; |
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|
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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 - NILFS_DIR_REC_LEN(1); offs += rec_len) { |
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p = (struct nilfs_dir_entry *)(kaddr + offs); |
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rec_len = nilfs_rec_len_from_disk(p->rec_len); |
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if (rec_len < NILFS_DIR_REC_LEN(1)) |
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goto Eshort; |
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if (rec_len & 3) |
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goto Ealign; |
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if (rec_len < NILFS_DIR_REC_LEN(p->name_len)) |
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goto Enamelen; |
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if (((offs + rec_len - 1) ^ offs) & ~(chunk_size-1)) |
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goto Espan; |
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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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|
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/* Too bad, we had an error */ |
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|
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Ebadsize: |
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nilfs_error(sb, |
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"size of directory #%lu is not a multiple of chunk size", |
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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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bad_entry: |
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nilfs_error(sb, |
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"bad entry in directory #%lu: %s - 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)le64_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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p = (struct nilfs_dir_entry *)(kaddr + offs); |
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nilfs_error(sb, |
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"entry in directory #%lu spans the page boundary offset=%lu, inode=%lu", |
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dir->i_ino, (page->index << PAGE_SHIFT) + offs, |
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(unsigned long)le64_to_cpu(p->inode)); |
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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 *nilfs_get_page(struct inode *dir, unsigned long n) |
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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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|
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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) || !nilfs_check_page(page)) |
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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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nilfs_put_page(page); |
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return ERR_PTR(-EIO); |
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} |
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|
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/* |
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* NOTE! unlike strncmp, nilfs_match returns 1 for success, 0 for failure. |
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* |
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* len <= NILFS_NAME_LEN and de != NULL are guaranteed by caller. |
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*/ |
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static int |
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nilfs_match(int len, const unsigned char *name, struct nilfs_dir_entry *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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/* |
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* p is at least 6 bytes before the end of page |
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*/ |
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static struct nilfs_dir_entry *nilfs_next_entry(struct nilfs_dir_entry *p) |
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{ |
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return (struct nilfs_dir_entry *)((char *)p + |
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nilfs_rec_len_from_disk(p->rec_len)); |
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} |
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static unsigned char |
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nilfs_filetype_table[NILFS_FT_MAX] = { |
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[NILFS_FT_UNKNOWN] = DT_UNKNOWN, |
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[NILFS_FT_REG_FILE] = DT_REG, |
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[NILFS_FT_DIR] = DT_DIR, |
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[NILFS_FT_CHRDEV] = DT_CHR, |
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[NILFS_FT_BLKDEV] = DT_BLK, |
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[NILFS_FT_FIFO] = DT_FIFO, |
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[NILFS_FT_SOCK] = DT_SOCK, |
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[NILFS_FT_SYMLINK] = DT_LNK, |
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}; |
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#define S_SHIFT 12 |
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static unsigned char |
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nilfs_type_by_mode[S_IFMT >> S_SHIFT] = { |
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[S_IFREG >> S_SHIFT] = NILFS_FT_REG_FILE, |
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[S_IFDIR >> S_SHIFT] = NILFS_FT_DIR, |
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[S_IFCHR >> S_SHIFT] = NILFS_FT_CHRDEV, |
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[S_IFBLK >> S_SHIFT] = NILFS_FT_BLKDEV, |
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[S_IFIFO >> S_SHIFT] = NILFS_FT_FIFO, |
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[S_IFSOCK >> S_SHIFT] = NILFS_FT_SOCK, |
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[S_IFLNK >> S_SHIFT] = NILFS_FT_SYMLINK, |
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}; |
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static void nilfs_set_de_type(struct nilfs_dir_entry *de, struct inode *inode) |
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{ |
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umode_t mode = inode->i_mode; |
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de->file_type = nilfs_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; |
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} |
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static int nilfs_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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if (pos > inode->i_size - NILFS_DIR_REC_LEN(1)) |
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return 0; |
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for ( ; n < npages; n++, offset = 0) { |
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char *kaddr, *limit; |
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struct nilfs_dir_entry *de; |
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struct page *page = nilfs_get_page(inode, n); |
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|
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if (IS_ERR(page)) { |
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nilfs_error(sb, "bad page in #%lu", inode->i_ino); |
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ctx->pos += PAGE_SIZE - offset; |
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return -EIO; |
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} |
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kaddr = page_address(page); |
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de = (struct nilfs_dir_entry *)(kaddr + offset); |
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limit = kaddr + nilfs_last_byte(inode, n) - |
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NILFS_DIR_REC_LEN(1); |
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for ( ; (char *)de <= limit; de = nilfs_next_entry(de)) { |
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if (de->rec_len == 0) { |
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nilfs_error(sb, "zero-length directory entry"); |
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nilfs_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 t; |
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|
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if (de->file_type < NILFS_FT_MAX) |
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t = nilfs_filetype_table[de->file_type]; |
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else |
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t = DT_UNKNOWN; |
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if (!dir_emit(ctx, de->name, de->name_len, |
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le64_to_cpu(de->inode), t)) { |
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nilfs_put_page(page); |
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return 0; |
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} |
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} |
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ctx->pos += nilfs_rec_len_from_disk(de->rec_len); |
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} |
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nilfs_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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/* |
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* nilfs_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, and the entry itself |
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* (as a parameter - res_dir). 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 nilfs_dir_entry * |
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nilfs_find_entry(struct inode *dir, const struct qstr *qstr, |
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struct page **res_page) |
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{ |
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const unsigned char *name = qstr->name; |
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int namelen = qstr->len; |
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unsigned int reclen = NILFS_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 nilfs_inode_info *ei = NILFS_I(dir); |
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struct nilfs_dir_entry *de; |
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|
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if (npages == 0) |
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goto out; |
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|
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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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|
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page = nilfs_get_page(dir, n); |
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if (!IS_ERR(page)) { |
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kaddr = page_address(page); |
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de = (struct nilfs_dir_entry *)kaddr; |
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kaddr += nilfs_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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nilfs_error(dir->i_sb, |
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"zero-length directory entry"); |
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nilfs_put_page(page); |
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goto out; |
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} |
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if (nilfs_match(namelen, name, de)) |
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goto found; |
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de = nilfs_next_entry(de); |
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} |
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nilfs_put_page(page); |
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} |
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if (++n >= npages) |
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n = 0; |
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/* next page is past the blocks we've got */ |
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if (unlikely(n > (dir->i_blocks >> (PAGE_SHIFT - 9)))) { |
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nilfs_error(dir->i_sb, |
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"dir %lu size %lld exceeds block count %llu", |
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dir->i_ino, dir->i_size, |
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(unsigned long long)dir->i_blocks); |
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goto out; |
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} |
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} while (n != start); |
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out: |
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return NULL; |
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found: |
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*res_page = page; |
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ei->i_dir_start_lookup = n; |
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return de; |
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} |
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|
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struct nilfs_dir_entry *nilfs_dotdot(struct inode *dir, struct page **p) |
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{ |
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struct page *page = nilfs_get_page(dir, 0); |
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struct nilfs_dir_entry *de = NULL; |
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|
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if (!IS_ERR(page)) { |
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de = nilfs_next_entry( |
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(struct nilfs_dir_entry *)page_address(page)); |
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*p = page; |
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} |
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return de; |
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} |
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ino_t nilfs_inode_by_name(struct inode *dir, const struct qstr *qstr) |
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{ |
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ino_t res = 0; |
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struct nilfs_dir_entry *de; |
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struct page *page; |
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|
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de = nilfs_find_entry(dir, qstr, &page); |
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if (de) { |
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res = le64_to_cpu(de->inode); |
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kunmap(page); |
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put_page(page); |
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} |
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return res; |
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} |
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|
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/* Releases the page */ |
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void nilfs_set_link(struct inode *dir, struct nilfs_dir_entry *de, |
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struct page *page, struct inode *inode) |
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{ |
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unsigned int from = (char *)de - (char *)page_address(page); |
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unsigned int to = from + nilfs_rec_len_from_disk(de->rec_len); |
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struct address_space *mapping = page->mapping; |
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int err; |
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|
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lock_page(page); |
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err = nilfs_prepare_chunk(page, from, to); |
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BUG_ON(err); |
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de->inode = cpu_to_le64(inode->i_ino); |
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nilfs_set_de_type(de, inode); |
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nilfs_commit_chunk(page, mapping, from, to); |
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nilfs_put_page(page); |
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dir->i_mtime = dir->i_ctime = current_time(dir); |
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} |
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|
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/* |
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* Parent is locked. |
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*/ |
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int nilfs_add_link(struct dentry *dentry, struct inode *inode) |
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{ |
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struct inode *dir = d_inode(dentry->d_parent); |
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const unsigned char *name = dentry->d_name.name; |
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int namelen = dentry->d_name.len; |
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unsigned int chunk_size = nilfs_chunk_size(dir); |
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unsigned int reclen = NILFS_DIR_REC_LEN(namelen); |
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unsigned short rec_len, name_len; |
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struct page *page = NULL; |
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struct nilfs_dir_entry *de; |
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unsigned long npages = dir_pages(dir); |
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unsigned long n; |
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char *kaddr; |
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unsigned int from, to; |
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int err; |
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|
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/* |
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* We take care of directory expansion in the same loop. |
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* This code plays outside i_size, so it locks the page |
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* to protect that region. |
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*/ |
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for (n = 0; n <= npages; n++) { |
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char *dir_end; |
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|
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page = nilfs_get_page(dir, n); |
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err = PTR_ERR(page); |
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if (IS_ERR(page)) |
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goto out; |
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lock_page(page); |
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kaddr = page_address(page); |
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dir_end = kaddr + nilfs_last_byte(dir, n); |
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de = (struct nilfs_dir_entry *)kaddr; |
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kaddr += PAGE_SIZE - reclen; |
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while ((char *)de <= kaddr) { |
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if ((char *)de == dir_end) { |
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/* We hit i_size */ |
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name_len = 0; |
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rec_len = chunk_size; |
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de->rec_len = nilfs_rec_len_to_disk(chunk_size); |
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de->inode = 0; |
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goto got_it; |
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} |
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if (de->rec_len == 0) { |
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nilfs_error(dir->i_sb, |
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"zero-length directory entry"); |
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err = -EIO; |
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goto out_unlock; |
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} |
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err = -EEXIST; |
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if (nilfs_match(namelen, name, de)) |
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goto out_unlock; |
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name_len = NILFS_DIR_REC_LEN(de->name_len); |
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rec_len = nilfs_rec_len_from_disk(de->rec_len); |
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if (!de->inode && rec_len >= reclen) |
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goto got_it; |
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if (rec_len >= name_len + reclen) |
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goto got_it; |
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de = (struct nilfs_dir_entry *)((char *)de + rec_len); |
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} |
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unlock_page(page); |
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nilfs_put_page(page); |
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} |
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BUG(); |
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return -EINVAL; |
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|
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got_it: |
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from = (char *)de - (char *)page_address(page); |
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to = from + rec_len; |
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err = nilfs_prepare_chunk(page, from, to); |
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if (err) |
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goto out_unlock; |
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if (de->inode) { |
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struct nilfs_dir_entry *de1; |
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|
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de1 = (struct nilfs_dir_entry *)((char *)de + name_len); |
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de1->rec_len = nilfs_rec_len_to_disk(rec_len - name_len); |
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de->rec_len = nilfs_rec_len_to_disk(name_len); |
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de = de1; |
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} |
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de->name_len = namelen; |
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memcpy(de->name, name, namelen); |
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de->inode = cpu_to_le64(inode->i_ino); |
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nilfs_set_de_type(de, inode); |
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nilfs_commit_chunk(page, page->mapping, from, to); |
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dir->i_mtime = dir->i_ctime = current_time(dir); |
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nilfs_mark_inode_dirty(dir); |
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/* OFFSET_CACHE */ |
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out_put: |
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nilfs_put_page(page); |
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out: |
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return err; |
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out_unlock: |
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unlock_page(page); |
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goto out_put; |
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} |
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|
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/* |
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* nilfs_delete_entry deletes a directory entry by merging it with the |
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* previous entry. Page is up-to-date. Releases the page. |
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*/ |
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int nilfs_delete_entry(struct nilfs_dir_entry *dir, struct page *page) |
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{ |
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struct address_space *mapping = page->mapping; |
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struct inode *inode = mapping->host; |
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char *kaddr = page_address(page); |
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unsigned int from, to; |
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struct nilfs_dir_entry *de, *pde = NULL; |
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int err; |
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|
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from = ((char *)dir - kaddr) & ~(nilfs_chunk_size(inode) - 1); |
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to = ((char *)dir - kaddr) + nilfs_rec_len_from_disk(dir->rec_len); |
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de = (struct nilfs_dir_entry *)(kaddr + from); |
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|
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while ((char *)de < (char *)dir) { |
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if (de->rec_len == 0) { |
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nilfs_error(inode->i_sb, |
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"zero-length directory entry"); |
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err = -EIO; |
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goto out; |
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} |
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pde = de; |
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de = nilfs_next_entry(de); |
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} |
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if (pde) |
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from = (char *)pde - (char *)page_address(page); |
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lock_page(page); |
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err = nilfs_prepare_chunk(page, from, to); |
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BUG_ON(err); |
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if (pde) |
|
pde->rec_len = nilfs_rec_len_to_disk(to - from); |
|
dir->inode = 0; |
|
nilfs_commit_chunk(page, mapping, from, to); |
|
inode->i_ctime = inode->i_mtime = current_time(inode); |
|
out: |
|
nilfs_put_page(page); |
|
return err; |
|
} |
|
|
|
/* |
|
* Set the first fragment of directory. |
|
*/ |
|
int nilfs_make_empty(struct inode *inode, struct inode *parent) |
|
{ |
|
struct address_space *mapping = inode->i_mapping; |
|
struct page *page = grab_cache_page(mapping, 0); |
|
unsigned int chunk_size = nilfs_chunk_size(inode); |
|
struct nilfs_dir_entry *de; |
|
int err; |
|
void *kaddr; |
|
|
|
if (!page) |
|
return -ENOMEM; |
|
|
|
err = nilfs_prepare_chunk(page, 0, chunk_size); |
|
if (unlikely(err)) { |
|
unlock_page(page); |
|
goto fail; |
|
} |
|
kaddr = kmap_atomic(page); |
|
memset(kaddr, 0, chunk_size); |
|
de = (struct nilfs_dir_entry *)kaddr; |
|
de->name_len = 1; |
|
de->rec_len = nilfs_rec_len_to_disk(NILFS_DIR_REC_LEN(1)); |
|
memcpy(de->name, ".\0\0", 4); |
|
de->inode = cpu_to_le64(inode->i_ino); |
|
nilfs_set_de_type(de, inode); |
|
|
|
de = (struct nilfs_dir_entry *)(kaddr + NILFS_DIR_REC_LEN(1)); |
|
de->name_len = 2; |
|
de->rec_len = nilfs_rec_len_to_disk(chunk_size - NILFS_DIR_REC_LEN(1)); |
|
de->inode = cpu_to_le64(parent->i_ino); |
|
memcpy(de->name, "..\0", 4); |
|
nilfs_set_de_type(de, inode); |
|
kunmap_atomic(kaddr); |
|
nilfs_commit_chunk(page, mapping, 0, chunk_size); |
|
fail: |
|
put_page(page); |
|
return err; |
|
} |
|
|
|
/* |
|
* routine to check that the specified directory is empty (for rmdir) |
|
*/ |
|
int nilfs_empty_dir(struct inode *inode) |
|
{ |
|
struct page *page = NULL; |
|
unsigned long i, npages = dir_pages(inode); |
|
|
|
for (i = 0; i < npages; i++) { |
|
char *kaddr; |
|
struct nilfs_dir_entry *de; |
|
|
|
page = nilfs_get_page(inode, i); |
|
if (IS_ERR(page)) |
|
continue; |
|
|
|
kaddr = page_address(page); |
|
de = (struct nilfs_dir_entry *)kaddr; |
|
kaddr += nilfs_last_byte(inode, i) - NILFS_DIR_REC_LEN(1); |
|
|
|
while ((char *)de <= kaddr) { |
|
if (de->rec_len == 0) { |
|
nilfs_error(inode->i_sb, |
|
"zero-length directory entry (kaddr=%p, de=%p)", |
|
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_le64(inode->i_ino)) |
|
goto not_empty; |
|
} else if (de->name[1] != '.') |
|
goto not_empty; |
|
} |
|
de = nilfs_next_entry(de); |
|
} |
|
nilfs_put_page(page); |
|
} |
|
return 1; |
|
|
|
not_empty: |
|
nilfs_put_page(page); |
|
return 0; |
|
} |
|
|
|
const struct file_operations nilfs_dir_operations = { |
|
.llseek = generic_file_llseek, |
|
.read = generic_read_dir, |
|
.iterate_shared = nilfs_readdir, |
|
.unlocked_ioctl = nilfs_ioctl, |
|
#ifdef CONFIG_COMPAT |
|
.compat_ioctl = nilfs_compat_ioctl, |
|
#endif /* CONFIG_COMPAT */ |
|
.fsync = nilfs_sync_file, |
|
|
|
};
|
|
|