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/ufs/ufs_dir.c
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 4) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 5) * Copyright (C) 1996
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 6) * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 7) * Laboratory for Computer Science Research Computing Facility
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 8) * Rutgers, The State University of New Jersey
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 9) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 10) * swab support by Francois-Rene Rideau <fare@tunes.org> 19970406
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 11) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 12) * 4.4BSD (FreeBSD) support added on February 1st 1998 by
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 13) * Niels Kristian Bech Jensen <nkbj@image.dk> partially based
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 14) * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>.
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 15) *
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 16) * Migration to usage of "page cache" on May 2006 by
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 17) * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 18) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 19)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 20) #include <linux/time.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 21) #include <linux/fs.h>
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 22) #include <linux/swap.h>
bb8c2d66bc6f7 (Jeff Layton 2017-12-11 06:35:18 -0500 23) #include <linux/iversion.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 24)
e542059884bb6 (Mike Frysinger 2008-02-08 04:21:31 -0800 25) #include "ufs_fs.h"
bcd6d4ecf6868 (Christoph Hellwig 2007-10-16 23:26:51 -0700 26) #include "ufs.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 27) #include "swab.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 28) #include "util.h"
^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) * NOTE! unlike strncmp, ufs_match returns 1 for success, 0 for failure.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 32) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 33) * len <= UFS_MAXNAMLEN and de != NULL are guaranteed by caller.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 34) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 35) static inline int ufs_match(struct super_block *sb, int len,
89031bc79782a (Al Viro 2010-01-31 20:49:54 -0500 36) const unsigned char *name, struct ufs_dir_entry *de)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 37) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 38) if (len != ufs_get_de_namlen(sb, de))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 39) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 40) if (!de->d_ino)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 41) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 42) return !memcmp(name, de->d_name, len);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 43) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 44)
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 45) static int ufs_commit_chunk(struct page *page, loff_t pos, unsigned len)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 46) {
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 47) struct address_space *mapping = page->mapping;
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 48) struct inode *dir = mapping->host;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 49) int err = 0;
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 50)
bb8c2d66bc6f7 (Jeff Layton 2017-12-11 06:35:18 -0500 51) inode_inc_iversion(dir);
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 52) block_write_end(NULL, mapping, pos, len, len, page, NULL);
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 53) if (pos+len > dir->i_size) {
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 54) i_size_write(dir, pos+len);
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 55) mark_inode_dirty(dir);
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 56) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 57) if (IS_DIRSYNC(dir))
2b69c8280c8b2 (Jeff Layton 2017-07-05 15:26:48 -0400 58) err = write_one_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 59) else
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 60) unlock_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 61) return err;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 62) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 63)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 64) static inline void ufs_put_page(struct page *page)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 65) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 66) kunmap(page);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 67) put_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 68) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 69)
89031bc79782a (Al Viro 2010-01-31 20:49:54 -0500 70) ino_t ufs_inode_by_name(struct inode *dir, const struct qstr *qstr)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 71) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 72) ino_t res = 0;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 73) struct ufs_dir_entry *de;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 74) struct page *page;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 75)
080497079c0ba (Alexey Dobriyan 2009-12-15 16:46:50 -0800 76) de = ufs_find_entry(dir, qstr, &page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 77) if (de) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 78) res = fs32_to_cpu(dir->i_sb, de->d_ino);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 79) ufs_put_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 80) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 81) return res;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 82) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 83)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 84)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 85) /* Releases the page */
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 86) void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
70d45cdb66439 (Al Viro 2015-06-16 01:56:23 -0400 87) struct page *page, struct inode *inode,
70d45cdb66439 (Al Viro 2015-06-16 01:56:23 -0400 88) bool update_times)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 89) {
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 90) loff_t pos = page_offset(page) +
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 91) (char *) de - (char *) page_address(page);
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 92) unsigned len = fs16_to_cpu(dir->i_sb, de->d_reclen);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 93) int err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 94)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 95) lock_page(page);
f4e420dc42314 (Christoph Hellwig 2010-06-04 11:29:56 +0200 96) err = ufs_prepare_chunk(page, pos, len);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 97) BUG_ON(err);
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 98)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 99) de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 100) ufs_set_de_type(dir->i_sb, de, inode->i_mode);
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 101)
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 102) err = ufs_commit_chunk(page, pos, len);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 103) ufs_put_page(page);
70d45cdb66439 (Al Viro 2015-06-16 01:56:23 -0400 104) if (update_times)
02027d42c3f74 (Deepa Dinamani 2016-09-14 07:48:05 -0700 105) dir->i_mtime = dir->i_ctime = current_time(dir);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 106) mark_inode_dirty(dir);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 107) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 108)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 109)
be5b82dbfec2a (Al Viro 2016-04-22 15:06:44 -0400 110) static bool ufs_check_page(struct page *page)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 111) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 112) struct inode *dir = page->mapping->host;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 113) struct super_block *sb = dir->i_sb;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 114) char *kaddr = page_address(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 115) unsigned offs, rec_len;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 116) unsigned limit = PAGE_SIZE;
f336953bfdee8 (Evgeniy Dushistov 2007-02-08 14:20:25 -0800 117) const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 118) struct ufs_dir_entry *p;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 119) char *error;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 120)
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 121) if ((dir->i_size >> PAGE_SHIFT) == page->index) {
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 122) limit = dir->i_size & ~PAGE_MASK;
f336953bfdee8 (Evgeniy Dushistov 2007-02-08 14:20:25 -0800 123) if (limit & chunk_mask)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 124) goto Ebadsize;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 125) if (!limit)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 126) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 127) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 128) for (offs = 0; offs <= limit - UFS_DIR_REC_LEN(1); offs += rec_len) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 129) p = (struct ufs_dir_entry *)(kaddr + offs);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 130) rec_len = fs16_to_cpu(sb, p->d_reclen);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 131)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 132) if (rec_len < UFS_DIR_REC_LEN(1))
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 133) goto Eshort;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 134) if (rec_len & 3)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 135) goto Ealign;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 136) if (rec_len < UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, p)))
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 137) goto Enamelen;
f336953bfdee8 (Evgeniy Dushistov 2007-02-08 14:20:25 -0800 138) if (((offs + rec_len - 1) ^ offs) & ~chunk_mask)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 139) goto Espan;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 140) if (fs32_to_cpu(sb, p->d_ino) > (UFS_SB(sb)->s_uspi->s_ipg *
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 141) UFS_SB(sb)->s_uspi->s_ncg))
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 142) goto Einumber;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 143) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 144) if (offs != limit)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 145) goto Eend;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 146) out:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 147) SetPageChecked(page);
be5b82dbfec2a (Al Viro 2016-04-22 15:06:44 -0400 148) return true;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 149)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 150) /* Too bad, we had an error */
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 151)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 152) Ebadsize:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 153) ufs_error(sb, "ufs_check_page",
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 154) "size of directory #%lu is not a multiple of chunk size",
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 155) dir->i_ino
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 156) );
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 157) goto fail;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 158) Eshort:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 159) error = "rec_len is smaller than minimal";
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 160) goto bad_entry;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 161) Ealign:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 162) error = "unaligned directory entry";
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 163) goto bad_entry;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 164) Enamelen:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 165) error = "rec_len is too small for name_len";
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 166) goto bad_entry;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 167) Espan:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 168) error = "directory entry across blocks";
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 169) goto bad_entry;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 170) Einumber:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 171) error = "inode out of bounds";
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 172) bad_entry:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 173) ufs_error (sb, "ufs_check_page", "bad entry in directory #%lu: %s - "
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 174) "offset=%lu, rec_len=%d, name_len=%d",
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 175) dir->i_ino, error, (page->index<<PAGE_SHIFT)+offs,
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 176) rec_len, ufs_get_de_namlen(sb, p));
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 177) goto fail;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 178) Eend:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 179) p = (struct ufs_dir_entry *)(kaddr + offs);
9746077a71d01 (Harvey Harrison 2008-04-28 02:16:17 -0700 180) ufs_error(sb, __func__,
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 181) "entry in directory #%lu spans the page boundary"
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 182) "offset=%lu",
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 183) dir->i_ino, (page->index<<PAGE_SHIFT)+offs);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 184) fail:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 185) SetPageError(page);
be5b82dbfec2a (Al Viro 2016-04-22 15:06:44 -0400 186) return false;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 187) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 188)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 189) static struct page *ufs_get_page(struct inode *dir, unsigned long n)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 190) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 191) struct address_space *mapping = dir->i_mapping;
6fe6900e1e5b6 (Nicholas Piggin 2007-05-06 14:49:04 -0700 192) struct page *page = read_mapping_page(mapping, n, NULL);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 193) if (!IS_ERR(page)) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 194) kmap(page);
be5b82dbfec2a (Al Viro 2016-04-22 15:06:44 -0400 195) if (unlikely(!PageChecked(page))) {
be5b82dbfec2a (Al Viro 2016-04-22 15:06:44 -0400 196) if (PageError(page) || !ufs_check_page(page))
be5b82dbfec2a (Al Viro 2016-04-22 15:06:44 -0400 197) goto fail;
be5b82dbfec2a (Al Viro 2016-04-22 15:06:44 -0400 198) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 199) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 200) return page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 201)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 202) fail:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 203) ufs_put_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 204) return ERR_PTR(-EIO);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 205) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 206)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 207) /*
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 208) * Return the offset into page `page_nr' of the last valid
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 209) * byte in that page, plus one.
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 210) */
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 211) static unsigned
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 212) ufs_last_byte(struct inode *inode, unsigned long page_nr)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 213) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 214) unsigned last_byte = inode->i_size;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 215)
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 216) last_byte -= page_nr << PAGE_SHIFT;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 217) if (last_byte > PAGE_SIZE)
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 218) last_byte = PAGE_SIZE;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 219) return last_byte;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 220) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 221)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 222) static inline struct ufs_dir_entry *
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 223) ufs_next_entry(struct super_block *sb, struct ufs_dir_entry *p)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 224) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 225) return (struct ufs_dir_entry *)((char *)p +
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 226) fs16_to_cpu(sb, p->d_reclen));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 227) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 228)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 229) struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 230) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 231) struct page *page = ufs_get_page(dir, 0);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 232) struct ufs_dir_entry *de = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 233)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 234) if (!IS_ERR(page)) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 235) de = ufs_next_entry(dir->i_sb,
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 236) (struct ufs_dir_entry *)page_address(page));
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 237) *p = page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 238) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 239) return de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 240) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 241)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 242) /*
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 243) * ufs_find_entry()
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 244) *
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 245) * finds an entry in the specified directory with the wanted name. It
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 246) * returns the page in which the entry was found, and the entry itself
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 247) * (as a parameter - res_dir). Page is returned mapped and unlocked.
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 248) * Entry is guaranteed to be valid.
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 249) */
89031bc79782a (Al Viro 2010-01-31 20:49:54 -0500 250) struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 251) struct page **res_page)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 252) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 253) struct super_block *sb = dir->i_sb;
89031bc79782a (Al Viro 2010-01-31 20:49:54 -0500 254) const unsigned char *name = qstr->name;
080497079c0ba (Alexey Dobriyan 2009-12-15 16:46:50 -0800 255) int namelen = qstr->len;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 256) unsigned reclen = UFS_DIR_REC_LEN(namelen);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 257) unsigned long start, n;
5d754ced150e3 (Fabian Frederick 2015-05-24 17:19:43 +0200 258) unsigned long npages = dir_pages(dir);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 259) struct page *page = NULL;
dd187a2603d99 (Evgeniy Dushistov 2006-06-25 05:47:25 -0700 260) struct ufs_inode_info *ui = UFS_I(dir);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 261) struct ufs_dir_entry *de;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 262)
abf5d15fd2e52 (Evgeniy Dushistov 2006-06-25 05:47:24 -0700 263) UFSD("ENTER, dir_ino %lu, name %s, namlen %u\n", dir->i_ino, name, namelen);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 264)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 265) if (npages == 0 || namelen > UFS_MAXNAMLEN)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 266) goto out;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 267)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 268) /* OFFSET_CACHE */
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 269) *res_page = NULL;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 270)
dd187a2603d99 (Evgeniy Dushistov 2006-06-25 05:47:25 -0700 271) start = ui->i_dir_start_lookup;
dd187a2603d99 (Evgeniy Dushistov 2006-06-25 05:47:25 -0700 272)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 273) if (start >= npages)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 274) start = 0;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 275) n = start;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 276) do {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 277) char *kaddr;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 278) page = ufs_get_page(dir, n);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 279) if (!IS_ERR(page)) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 280) kaddr = page_address(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 281) de = (struct ufs_dir_entry *) kaddr;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 282) kaddr += ufs_last_byte(dir, n) - reclen;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 283) while ((char *) de <= kaddr) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 284) if (ufs_match(sb, namelen, name, de))
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 285) goto found;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 286) de = ufs_next_entry(sb, de);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 287) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 288) ufs_put_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 289) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 290) if (++n >= npages)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 291) n = 0;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 292) } while (n != start);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 293) out:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 294) return NULL;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 295)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 296) found:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 297) *res_page = page;
dd187a2603d99 (Evgeniy Dushistov 2006-06-25 05:47:25 -0700 298) ui->i_dir_start_lookup = n;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 299) return de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 300) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 301)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 302) /*
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 303) * Parent is locked.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 304) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 305) int ufs_add_link(struct dentry *dentry, struct inode *inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 306) {
2b0143b5c986b (David Howells 2015-03-17 22:25:59 +0000 307) struct inode *dir = d_inode(dentry->d_parent);
89031bc79782a (Al Viro 2010-01-31 20:49:54 -0500 308) const unsigned char *name = dentry->d_name.name;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 309) int namelen = dentry->d_name.len;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 310) struct super_block *sb = dir->i_sb;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 311) unsigned reclen = UFS_DIR_REC_LEN(namelen);
f336953bfdee8 (Evgeniy Dushistov 2007-02-08 14:20:25 -0800 312) const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 313) unsigned short rec_len, name_len;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 314) struct page *page = NULL;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 315) struct ufs_dir_entry *de;
5d754ced150e3 (Fabian Frederick 2015-05-24 17:19:43 +0200 316) unsigned long npages = dir_pages(dir);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 317) unsigned long n;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 318) char *kaddr;
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 319) loff_t pos;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 320) int err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 321)
abf5d15fd2e52 (Evgeniy Dushistov 2006-06-25 05:47:24 -0700 322) UFSD("ENTER, name %s, namelen %u\n", name, namelen);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 323)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 324) /*
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 325) * We take care of directory expansion in the same loop.
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 326) * This code plays outside i_size, so it locks the page
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 327) * to protect that region.
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 328) */
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 329) for (n = 0; n <= npages; n++) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 330) char *dir_end;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 331)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 332) page = ufs_get_page(dir, n);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 333) err = PTR_ERR(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 334) if (IS_ERR(page))
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 335) goto out;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 336) lock_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 337) kaddr = page_address(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 338) dir_end = kaddr + ufs_last_byte(dir, n);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 339) de = (struct ufs_dir_entry *)kaddr;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 340) kaddr += PAGE_SIZE - reclen;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 341) while ((char *)de <= kaddr) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 342) if ((char *)de == dir_end) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 343) /* We hit i_size */
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 344) name_len = 0;
f336953bfdee8 (Evgeniy Dushistov 2007-02-08 14:20:25 -0800 345) rec_len = chunk_size;
f336953bfdee8 (Evgeniy Dushistov 2007-02-08 14:20:25 -0800 346) de->d_reclen = cpu_to_fs16(sb, chunk_size);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 347) de->d_ino = 0;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 348) goto got_it;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 349) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 350) if (de->d_reclen == 0) {
9746077a71d01 (Harvey Harrison 2008-04-28 02:16:17 -0700 351) ufs_error(dir->i_sb, __func__,
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 352) "zero-length directory entry");
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 353) err = -EIO;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 354) goto out_unlock;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 355) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 356) err = -EEXIST;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 357) if (ufs_match(sb, namelen, name, de))
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 358) goto out_unlock;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 359) name_len = UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de));
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 360) rec_len = fs16_to_cpu(sb, de->d_reclen);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 361) if (!de->d_ino && rec_len >= reclen)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 362) goto got_it;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 363) if (rec_len >= name_len + reclen)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 364) goto got_it;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 365) de = (struct ufs_dir_entry *) ((char *) de + rec_len);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 366) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 367) unlock_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 368) ufs_put_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 369) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 370) BUG();
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 371) return -EINVAL;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 372)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 373) got_it:
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 374) pos = page_offset(page) +
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 375) (char*)de - (char*)page_address(page);
f4e420dc42314 (Christoph Hellwig 2010-06-04 11:29:56 +0200 376) err = ufs_prepare_chunk(page, pos, rec_len);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 377) if (err)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 378) goto out_unlock;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 379) if (de->d_ino) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 380) struct ufs_dir_entry *de1 =
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 381) (struct ufs_dir_entry *) ((char *) de + name_len);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 382) de1->d_reclen = cpu_to_fs16(sb, rec_len - name_len);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 383) de->d_reclen = cpu_to_fs16(sb, name_len);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 384)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 385) de = de1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 386) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 387)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 388) ufs_set_de_namlen(sb, de, namelen);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 389) memcpy(de->d_name, name, namelen + 1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 390) de->d_ino = cpu_to_fs32(sb, inode->i_ino);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 391) ufs_set_de_type(sb, de, inode->i_mode);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 392)
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 393) err = ufs_commit_chunk(page, pos, rec_len);
02027d42c3f74 (Deepa Dinamani 2016-09-14 07:48:05 -0700 394) dir->i_mtime = dir->i_ctime = current_time(dir);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 395)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 396) mark_inode_dirty(dir);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 397) /* OFFSET_CACHE */
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 398) out_put:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 399) ufs_put_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 400) out:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 401) return err;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 402) out_unlock:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 403) unlock_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 404) goto out_put;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 405) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 406)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 407) static inline unsigned
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 408) ufs_validate_entry(struct super_block *sb, char *base,
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 409) unsigned offset, unsigned mask)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 410) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 411) struct ufs_dir_entry *de = (struct ufs_dir_entry*)(base + offset);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 412) struct ufs_dir_entry *p = (struct ufs_dir_entry*)(base + (offset&mask));
e0d508f1092db (Al Viro 2016-05-27 21:22:04 -0400 413) while ((char*)p < (char*)de)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 414) p = ufs_next_entry(sb, p);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 415) return (char *)p - base;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 416) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 417)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 418)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 419) /*
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 420) * This is blatantly stolen from ext2fs
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 421) */
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 422) static int
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 423) ufs_readdir(struct file *file, struct dir_context *ctx)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 424) {
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 425) loff_t pos = ctx->pos;
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 426) struct inode *inode = file_inode(file);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 427) struct super_block *sb = inode->i_sb;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 428) unsigned int offset = pos & ~PAGE_MASK;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 429) unsigned long n = pos >> PAGE_SHIFT;
5d754ced150e3 (Fabian Frederick 2015-05-24 17:19:43 +0200 430) unsigned long npages = dir_pages(inode);
f336953bfdee8 (Evgeniy Dushistov 2007-02-08 14:20:25 -0800 431) unsigned chunk_mask = ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
c472c07bfed9c (Goffredo Baroncelli 2018-02-01 08:15:25 -0500 432) bool need_revalidate = !inode_eq_iversion(inode, file->f_version);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 433) unsigned flags = UFS_SB(sb)->s_flags;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 434)
abf5d15fd2e52 (Evgeniy Dushistov 2006-06-25 05:47:24 -0700 435) UFSD("BEGIN\n");
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 436)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 437) if (pos > inode->i_size - UFS_DIR_REC_LEN(1))
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 438) return 0;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 439)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 440) for ( ; n < npages; n++, offset = 0) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 441) char *kaddr, *limit;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 442) struct ufs_dir_entry *de;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 443)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 444) struct page *page = ufs_get_page(inode, n);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 445)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 446) if (IS_ERR(page)) {
9746077a71d01 (Harvey Harrison 2008-04-28 02:16:17 -0700 447) ufs_error(sb, __func__,
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 448) "bad page in #%lu",
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 449) inode->i_ino);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 450) ctx->pos += PAGE_SIZE - offset;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 451) return -EIO;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 452) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 453) kaddr = page_address(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 454) if (unlikely(need_revalidate)) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 455) if (offset) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 456) offset = ufs_validate_entry(sb, kaddr, offset, chunk_mask);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 457) ctx->pos = (n<<PAGE_SHIFT) + offset;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 458) }
bb8c2d66bc6f7 (Jeff Layton 2017-12-11 06:35:18 -0500 459) file->f_version = inode_query_iversion(inode);
bb8c2d66bc6f7 (Jeff Layton 2017-12-11 06:35:18 -0500 460) need_revalidate = false;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 461) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 462) de = (struct ufs_dir_entry *)(kaddr+offset);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 463) limit = kaddr + ufs_last_byte(inode, n) - UFS_DIR_REC_LEN(1);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 464) for ( ;(char*)de <= limit; de = ufs_next_entry(sb, de)) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 465) if (de->d_ino) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 466) unsigned char d_type = DT_UNKNOWN;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 467)
abf5d15fd2e52 (Evgeniy Dushistov 2006-06-25 05:47:24 -0700 468) UFSD("filldir(%s,%u)\n", de->d_name,
abf5d15fd2e52 (Evgeniy Dushistov 2006-06-25 05:47:24 -0700 469) fs32_to_cpu(sb, de->d_ino));
abf5d15fd2e52 (Evgeniy Dushistov 2006-06-25 05:47:24 -0700 470) UFSD("namlen %u\n", ufs_get_de_namlen(sb, de));
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 471)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 472) if ((flags & UFS_DE_MASK) == UFS_DE_44BSD)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 473) d_type = de->d_u.d_44.d_type;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 474)
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 475) if (!dir_emit(ctx, de->d_name,
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 476) ufs_get_de_namlen(sb, de),
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 477) fs32_to_cpu(sb, de->d_ino),
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 478) d_type)) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 479) ufs_put_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 480) return 0;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 481) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 482) }
80886298c0723 (Al Viro 2013-05-15 18:51:49 -0400 483) ctx->pos += fs16_to_cpu(sb, de->d_reclen);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 484) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 485) ufs_put_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 486) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 487) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 488) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 489)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 490)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 491) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 492) * ufs_delete_entry deletes a directory entry by merging it with the
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 493) * previous entry.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 494) */
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 495) int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 496) struct page * page)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 497) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 498) struct super_block *sb = inode->i_sb;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 499) char *kaddr = page_address(page);
f336953bfdee8 (Evgeniy Dushistov 2007-02-08 14:20:25 -0800 500) unsigned from = ((char*)dir - kaddr) & ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 501) unsigned to = ((char*)dir - kaddr) + fs16_to_cpu(sb, dir->d_reclen);
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 502) loff_t pos;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 503) struct ufs_dir_entry *pde = NULL;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 504) struct ufs_dir_entry *de = (struct ufs_dir_entry *) (kaddr + from);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 505) int err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 506)
abf5d15fd2e52 (Evgeniy Dushistov 2006-06-25 05:47:24 -0700 507) UFSD("ENTER\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 508)
abf5d15fd2e52 (Evgeniy Dushistov 2006-06-25 05:47:24 -0700 509) UFSD("ino %u, reclen %u, namlen %u, name %s\n",
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 510) fs32_to_cpu(sb, de->d_ino),
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 511) fs16_to_cpu(sb, de->d_reclen),
abf5d15fd2e52 (Evgeniy Dushistov 2006-06-25 05:47:24 -0700 512) ufs_get_de_namlen(sb, de), de->d_name);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 513)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 514) while ((char*)de < (char*)dir) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 515) if (de->d_reclen == 0) {
9746077a71d01 (Harvey Harrison 2008-04-28 02:16:17 -0700 516) ufs_error(inode->i_sb, __func__,
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 517) "zero-length directory entry");
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 518) err = -EIO;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 519) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 520) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 521) pde = de;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 522) de = ufs_next_entry(sb, de);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 523) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 524) if (pde)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 525) from = (char*)pde - (char*)page_address(page);
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 526)
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 527) pos = page_offset(page) + from;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 528) lock_page(page);
f4e420dc42314 (Christoph Hellwig 2010-06-04 11:29:56 +0200 529) err = ufs_prepare_chunk(page, pos, to - from);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 530) BUG_ON(err);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 531) if (pde)
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 532) pde->d_reclen = cpu_to_fs16(sb, to - from);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 533) dir->d_ino = 0;
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 534) err = ufs_commit_chunk(page, pos, to - from);
02027d42c3f74 (Deepa Dinamani 2016-09-14 07:48:05 -0700 535) inode->i_ctime = inode->i_mtime = current_time(inode);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 536) mark_inode_dirty(inode);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 537) out:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 538) ufs_put_page(page);
abf5d15fd2e52 (Evgeniy Dushistov 2006-06-25 05:47:24 -0700 539) UFSD("EXIT\n");
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 540) return err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 541) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 542)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 543) int ufs_make_empty(struct inode * inode, struct inode *dir)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 544) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 545) struct super_block * sb = dir->i_sb;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 546) struct address_space *mapping = inode->i_mapping;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 547) struct page *page = grab_cache_page(mapping, 0);
f336953bfdee8 (Evgeniy Dushistov 2007-02-08 14:20:25 -0800 548) const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 549) struct ufs_dir_entry * de;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 550) char *base;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 551) int err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 552)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 553) if (!page)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 554) return -ENOMEM;
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 555)
f4e420dc42314 (Christoph Hellwig 2010-06-04 11:29:56 +0200 556) err = ufs_prepare_chunk(page, 0, chunk_size);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 557) if (err) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 558) unlock_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 559) goto fail;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 560) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 561)
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 562) kmap(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 563) base = (char*)page_address(page);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 564) memset(base, 0, PAGE_SIZE);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 565)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 566) de = (struct ufs_dir_entry *) base;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 567)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 568) de->d_ino = cpu_to_fs32(sb, inode->i_ino);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 569) ufs_set_de_type(sb, de, inode->i_mode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 570) ufs_set_de_namlen(sb, de, 1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 571) de->d_reclen = cpu_to_fs16(sb, UFS_DIR_REC_LEN(1));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 572) strcpy (de->d_name, ".");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 573) de = (struct ufs_dir_entry *)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 574) ((char *)de + fs16_to_cpu(sb, de->d_reclen));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 575) de->d_ino = cpu_to_fs32(sb, dir->i_ino);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 576) ufs_set_de_type(sb, de, dir->i_mode);
f336953bfdee8 (Evgeniy Dushistov 2007-02-08 14:20:25 -0800 577) de->d_reclen = cpu_to_fs16(sb, chunk_size - UFS_DIR_REC_LEN(1));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 578) ufs_set_de_namlen(sb, de, 2);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 579) strcpy (de->d_name, "..");
82b9d1d0da804 (Nicholas Piggin 2007-10-16 01:25:19 -0700 580) kunmap(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 581)
f336953bfdee8 (Evgeniy Dushistov 2007-02-08 14:20:25 -0800 582) err = ufs_commit_chunk(page, 0, chunk_size);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 583) fail:
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 584) put_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 585) return err;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 586) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 587)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 588) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 589) * routine to check that the specified directory is empty (for rmdir)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 590) */
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 591) int ufs_empty_dir(struct inode * inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 592) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 593) struct super_block *sb = inode->i_sb;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 594) struct page *page = NULL;
5d754ced150e3 (Fabian Frederick 2015-05-24 17:19:43 +0200 595) unsigned long i, npages = dir_pages(inode);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 596)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 597) for (i = 0; i < npages; i++) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 598) char *kaddr;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 599) struct ufs_dir_entry *de;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 600) page = ufs_get_page(inode, i);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 601)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 602) if (IS_ERR(page))
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 603) continue;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 604)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 605) kaddr = page_address(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 606) de = (struct ufs_dir_entry *)kaddr;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 607) kaddr += ufs_last_byte(inode, i) - UFS_DIR_REC_LEN(1);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 608)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 609) while ((char *)de <= kaddr) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 610) if (de->d_reclen == 0) {
9746077a71d01 (Harvey Harrison 2008-04-28 02:16:17 -0700 611) ufs_error(inode->i_sb, __func__,
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 612) "zero-length directory entry: "
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 613) "kaddr=%p, de=%p\n", kaddr, de);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 614) goto not_empty;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 615) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 616) if (de->d_ino) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 617) u16 namelen=ufs_get_de_namlen(sb, de);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 618) /* check for . and .. */
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 619) if (de->d_name[0] != '.')
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 620) goto not_empty;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 621) if (namelen > 2)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 622) goto not_empty;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 623) if (namelen < 2) {
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 624) if (inode->i_ino !=
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 625) fs32_to_cpu(sb, de->d_ino))
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 626) goto not_empty;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 627) } else if (de->d_name[1] != '.')
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 628) goto not_empty;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 629) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 630) de = ufs_next_entry(sb, de);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 631) }
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 632) ufs_put_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 633) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 634) return 1;
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 635)
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 636) not_empty:
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 637) ufs_put_page(page);
b71034e5e67d1 (Evgeniy Dushistov 2006-06-25 05:47:22 -0700 638) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 639) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 640)
4b6f5d20b04dc (Arjan van de Ven 2006-03-28 01:56:42 -0800 641) const struct file_operations ufs_dir_operations = {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 642) .read = generic_read_dir,
3b0a3c1ac1598 (Al Viro 2016-04-20 23:42:46 -0400 643) .iterate_shared = ufs_readdir,
1b061d9247f71 (Christoph Hellwig 2010-05-26 17:53:41 +0200 644) .fsync = generic_file_fsync,
3222a3e55f402 (Christoph Hellwig 2008-09-03 21:53:01 +0200 645) .llseek = generic_file_llseek,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 646) };
VisionFive2 Linux kernel
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