b24413180f560 (Greg Kroah-Hartman 2017-11-01 15:07:57 +0100 1) // SPDX-License-Identifier: GPL-2.0
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 2) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 3) * linux/fs/sysv/dir.c
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 4) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 5) * minix/dir.c
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 6) * Copyright (C) 1991, 1992 Linus Torvalds
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 7) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 8) * coh/dir.c
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 9) * Copyright (C) 1993 Pascal Haible, Bruno Haible
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 10) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 11) * sysv/dir.c
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 12) * Copyright (C) 1993 Bruno Haible
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 13) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 14) * SystemV/Coherent directory handling functions
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 15) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 16)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 17) #include <linux/pagemap.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 18) #include <linux/highmem.h>
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 19) #include <linux/swap.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 20) #include "sysv.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 21)
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 22) static int sysv_readdir(struct file *, struct dir_context *);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 23)
4b6f5d20b04dc (Arjan van de Ven 2006-03-28 01:56:42 -0800 24) const struct file_operations sysv_dir_operations = {
5ac3455a843d2 (Al Viro 2009-06-16 23:59:37 -0400 25) .llseek = generic_file_llseek,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 26) .read = generic_read_dir,
3b0a3c1ac1598 (Al Viro 2016-04-20 23:42:46 -0400 27) .iterate_shared = sysv_readdir,
1b061d9247f71 (Christoph Hellwig 2010-05-26 17:53:41 +0200 28) .fsync = generic_file_fsync,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 29) };
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 30)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 31) static inline void dir_put_page(struct page *page)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 32) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 33) kunmap(page);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 34) put_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 35) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 36)
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 37) static int dir_commit_chunk(struct page *page, loff_t pos, unsigned len)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 38) {
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 39) struct address_space *mapping = page->mapping;
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 40) struct inode *dir = mapping->host;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 41) int err = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 42)
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 43) block_write_end(NULL, mapping, pos, len, len, page, NULL);
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 44) if (pos+len > dir->i_size) {
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 45) i_size_write(dir, pos+len);
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 46) mark_inode_dirty(dir);
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 47) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 48) if (IS_DIRSYNC(dir))
2b69c8280c8b2 (Jeff Layton 2017-07-05 15:26:48 -0400 49) err = write_one_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 50) else
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 51) unlock_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 52) return err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 53) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 54)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 55) static struct page * dir_get_page(struct inode *dir, unsigned long n)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 56) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 57) struct address_space *mapping = dir->i_mapping;
090d2b185d868 (Pekka Enberg 2006-06-23 02:05:08 -0700 58) struct page *page = read_mapping_page(mapping, n, NULL);
6fe6900e1e5b6 (Nicholas Piggin 2007-05-06 14:49:04 -0700 59) if (!IS_ERR(page))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 60) kmap(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 61) return page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 62) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 63)
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 64) static int sysv_readdir(struct file *file, struct dir_context *ctx)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 65) {
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 66) unsigned long pos = ctx->pos;
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 67) struct inode *inode = file_inode(file);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 68) struct super_block *sb = inode->i_sb;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 69) unsigned long npages = dir_pages(inode);
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 70) unsigned offset;
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 71) unsigned long n;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 72)
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 73) ctx->pos = pos = (pos + SYSV_DIRSIZE-1) & ~(SYSV_DIRSIZE-1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 74) if (pos >= inode->i_size)
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 75) return 0;
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 76)
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 77) offset = pos & ~PAGE_MASK;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 78) n = pos >> PAGE_SHIFT;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 79)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 80) for ( ; n < npages; n++, offset = 0) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 81) char *kaddr, *limit;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 82) struct sysv_dir_entry *de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 83) struct page *page = dir_get_page(inode, n);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 84)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 85) if (IS_ERR(page))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 86) continue;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 87) kaddr = (char *)page_address(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 88) de = (struct sysv_dir_entry *)(kaddr+offset);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 89) limit = kaddr + PAGE_SIZE - SYSV_DIRSIZE;
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 90) for ( ;(char*)de <= limit; de++, ctx->pos += sizeof(*de)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 91) char *name = de->name;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 92)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 93) if (!de->inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 94) continue;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 95)
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 96) if (!dir_emit(ctx, name, strnlen(name,SYSV_NAMELEN),
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 97) fs16_to_cpu(SYSV_SB(sb), de->inode),
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 98) DT_UNKNOWN)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 99) dir_put_page(page);
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 100) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 101) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 102) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 103) dir_put_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 104) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 105) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 106) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 107)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 108) /* compare strings: name[0..len-1] (not zero-terminated) and
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 109) * buffer[0..] (filled with zeroes up to buffer[0..maxlen-1])
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 110) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 111) static inline int namecompare(int len, int maxlen,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 112) const char * name, const char * buffer)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 113) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 114) if (len < maxlen && buffer[len])
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 115) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 116) return !memcmp(name, buffer, len);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 117) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 118)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 119) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 120) * sysv_find_entry()
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 121) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 122) * finds an entry in the specified directory with the wanted name. It
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 123) * returns the cache buffer in which the entry was found, and the entry
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 124) * itself (as a parameter - res_dir). It does NOT read the inode of the
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 125) * entry - you'll have to do that yourself if you want to.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 126) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 127) struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct page **res_page)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 128) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 129) const char * name = dentry->d_name.name;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 130) int namelen = dentry->d_name.len;
2b0143b5c986b (David Howells 2015-03-17 22:25:59 +0000 131) struct inode * dir = d_inode(dentry->d_parent);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 132) unsigned long start, n;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 133) unsigned long npages = dir_pages(dir);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 134) struct page *page = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 135) struct sysv_dir_entry *de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 136)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 137) *res_page = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 138)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 139) start = SYSV_I(dir)->i_dir_start_lookup;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 140) if (start >= npages)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 141) start = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 142) n = start;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 143)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 144) do {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 145) char *kaddr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 146) page = dir_get_page(dir, n);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 147) if (!IS_ERR(page)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 148) kaddr = (char*)page_address(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 149) de = (struct sysv_dir_entry *) kaddr;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 150) kaddr += PAGE_SIZE - SYSV_DIRSIZE;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 151) for ( ; (char *) de <= kaddr ; de++) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 152) if (!de->inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 153) continue;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 154) if (namecompare(namelen, SYSV_NAMELEN,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 155) name, de->name))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 156) goto found;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 157) }
404e781249f00 (Dan Carpenter 2010-04-21 12:30:32 +0200 158) dir_put_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 159) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 160)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 161) if (++n >= npages)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 162) n = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 163) } while (n != start);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 164)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 165) return NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 166)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 167) found:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 168) SYSV_I(dir)->i_dir_start_lookup = n;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 169) *res_page = page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 170) return de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 171) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 172)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 173) int sysv_add_link(struct dentry *dentry, struct inode *inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 174) {
2b0143b5c986b (David Howells 2015-03-17 22:25:59 +0000 175) struct inode *dir = d_inode(dentry->d_parent);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 176) const char * name = dentry->d_name.name;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 177) int namelen = dentry->d_name.len;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 178) struct page *page = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 179) struct sysv_dir_entry * de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 180) unsigned long npages = dir_pages(dir);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 181) unsigned long n;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 182) char *kaddr;
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 183) loff_t pos;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 184) int err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 185)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 186) /* We take care of directory expansion in the same loop */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 187) for (n = 0; n <= npages; n++) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 188) page = dir_get_page(dir, n);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 189) err = PTR_ERR(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 190) if (IS_ERR(page))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 191) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 192) kaddr = (char*)page_address(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 193) de = (struct sysv_dir_entry *)kaddr;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 194) kaddr += PAGE_SIZE - SYSV_DIRSIZE;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 195) while ((char *)de <= kaddr) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 196) if (!de->inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 197) goto got_it;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 198) err = -EEXIST;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 199) if (namecompare(namelen, SYSV_NAMELEN, name, de->name))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 200) goto out_page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 201) de++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 202) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 203) dir_put_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 204) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 205) BUG();
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 206) return -EINVAL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 207)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 208) got_it:
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 209) pos = page_offset(page) +
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 210) (char*)de - (char*)page_address(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 211) lock_page(page);
f4e420dc42314 (Christoph Hellwig 2010-06-04 11:29:56 +0200 212) err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 213) if (err)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 214) goto out_unlock;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 215) memcpy (de->name, name, namelen);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 216) memset (de->name + namelen, 0, SYSV_DIRSIZE - namelen - 2);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 217) de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 218) err = dir_commit_chunk(page, pos, SYSV_DIRSIZE);
02027d42c3f74 (Deepa Dinamani 2016-09-14 07:48:05 -0700 219) dir->i_mtime = dir->i_ctime = current_time(dir);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 220) mark_inode_dirty(dir);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 221) out_page:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 222) dir_put_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 223) out:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 224) return err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 225) out_unlock:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 226) unlock_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 227) goto out_page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 228) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 229)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 230) int sysv_delete_entry(struct sysv_dir_entry *de, struct page *page)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 231) {
f4e420dc42314 (Christoph Hellwig 2010-06-04 11:29:56 +0200 232) struct inode *inode = page->mapping->host;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 233) char *kaddr = (char*)page_address(page);
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 234) loff_t pos = page_offset(page) + (char *)de - kaddr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 235) int err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 236)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 237) lock_page(page);
f4e420dc42314 (Christoph Hellwig 2010-06-04 11:29:56 +0200 238) err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE);
d6735bfcc9988 (Eric Sesterhenn 2006-04-02 13:39:21 +0200 239) BUG_ON(err);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 240) de->inode = 0;
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 241) err = dir_commit_chunk(page, pos, SYSV_DIRSIZE);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 242) dir_put_page(page);
02027d42c3f74 (Deepa Dinamani 2016-09-14 07:48:05 -0700 243) inode->i_ctime = inode->i_mtime = current_time(inode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 244) mark_inode_dirty(inode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 245) return err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 246) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 247)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 248) int sysv_make_empty(struct inode *inode, struct inode *dir)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 249) {
f4e420dc42314 (Christoph Hellwig 2010-06-04 11:29:56 +0200 250) struct page *page = grab_cache_page(inode->i_mapping, 0);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 251) struct sysv_dir_entry * de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 252) char *base;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 253) int err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 254)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 255) if (!page)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 256) return -ENOMEM;
f4e420dc42314 (Christoph Hellwig 2010-06-04 11:29:56 +0200 257) err = sysv_prepare_chunk(page, 0, 2 * SYSV_DIRSIZE);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 258) if (err) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 259) unlock_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 260) goto fail;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 261) }
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 262) kmap(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 263)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 264) base = (char*)page_address(page);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 265) memset(base, 0, PAGE_SIZE);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 266)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 267) de = (struct sysv_dir_entry *) base;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 268) de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 269) strcpy(de->name,".");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 270) de++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 271) de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), dir->i_ino);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 272) strcpy(de->name,"..");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 273)
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 274) kunmap(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 275) err = dir_commit_chunk(page, 0, 2 * SYSV_DIRSIZE);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 276) fail:
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 277) put_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 278) return err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 279) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 280)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 281) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 282) * routine to check that the specified directory is empty (for rmdir)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 283) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 284) int sysv_empty_dir(struct inode * inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 285) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 286) struct super_block *sb = inode->i_sb;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 287) struct page *page = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 288) unsigned long i, npages = dir_pages(inode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 289)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 290) for (i = 0; i < npages; i++) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 291) char *kaddr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 292) struct sysv_dir_entry * de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 293) page = dir_get_page(inode, i);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 294)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 295) if (IS_ERR(page))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 296) continue;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 297)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 298) kaddr = (char *)page_address(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 299) de = (struct sysv_dir_entry *)kaddr;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 300) kaddr += PAGE_SIZE-SYSV_DIRSIZE;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 301)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 302) for ( ;(char *)de <= kaddr; de++) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 303) if (!de->inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 304) continue;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 305) /* check for . and .. */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 306) if (de->name[0] != '.')
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 307) goto not_empty;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 308) if (!de->name[1]) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 309) if (de->inode == cpu_to_fs16(SYSV_SB(sb),
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 310) inode->i_ino))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 311) continue;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 312) goto not_empty;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 313) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 314) if (de->name[1] != '.' || de->name[2])
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 315) goto not_empty;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 316) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 317) dir_put_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 318) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 319) return 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 320)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 321) not_empty:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 322) dir_put_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 323) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 324) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 325)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 326) /* Releases the page */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 327) void sysv_set_link(struct sysv_dir_entry *de, struct page *page,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 328) struct inode *inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 329) {
f4e420dc42314 (Christoph Hellwig 2010-06-04 11:29:56 +0200 330) struct inode *dir = page->mapping->host;
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 331) loff_t pos = page_offset(page) +
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 332) (char *)de-(char*)page_address(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 333) int err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 334)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 335) lock_page(page);
f4e420dc42314 (Christoph Hellwig 2010-06-04 11:29:56 +0200 336) err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE);
d6735bfcc9988 (Eric Sesterhenn 2006-04-02 13:39:21 +0200 337) BUG_ON(err);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 338) de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
26a6441aadde8 (Nicholas Piggin 2007-10-16 01:25:21 -0700 339) err = dir_commit_chunk(page, pos, SYSV_DIRSIZE);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 340) dir_put_page(page);
02027d42c3f74 (Deepa Dinamani 2016-09-14 07:48:05 -0700 341) dir->i_mtime = dir->i_ctime = current_time(dir);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 342) mark_inode_dirty(dir);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 343) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 344)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 345) struct sysv_dir_entry * sysv_dotdot (struct inode *dir, struct page **p)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 346) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 347) struct page *page = dir_get_page(dir, 0);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 348) struct sysv_dir_entry *de = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 349)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 350) if (!IS_ERR(page)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 351) de = (struct sysv_dir_entry*) page_address(page) + 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 352) *p = page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 353) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 354) return de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 355) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 356)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 357) ino_t sysv_inode_by_name(struct dentry *dentry)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 358) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 359) struct page *page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 360) struct sysv_dir_entry *de = sysv_find_entry (dentry, &page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 361) ino_t res = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 362)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 363) if (de) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 364) res = fs16_to_cpu(SYSV_SB(dentry->d_sb), de->inode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 365) dir_put_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 366) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 367) return res;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 368) }
VisionFive2 Linux kernel
StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)
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