| 1 |
62 |
marcus.erl |
/*
|
| 2 |
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* linux/fs/fat/dir.c
|
| 3 |
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*
|
| 4 |
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* directory handling functions for fat-based filesystems
|
| 5 |
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*
|
| 6 |
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* Written 1992,1993 by Werner Almesberger
|
| 7 |
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*
|
| 8 |
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* Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu>
|
| 9 |
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*
|
| 10 |
|
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* VFAT extensions by Gordon Chaffee <chaffee@plateau.cs.berkeley.edu>
|
| 11 |
|
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* Merged with msdos fs by Henrik Storner <storner@osiris.ping.dk>
|
| 12 |
|
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* Rewritten for constant inumbers. Plugged buffer overrun in readdir(). AV
|
| 13 |
|
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* Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de>
|
| 14 |
|
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*/
|
| 15 |
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| 16 |
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#include <linux/module.h>
|
| 17 |
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#include <linux/slab.h>
|
| 18 |
|
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#include <linux/time.h>
|
| 19 |
|
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#include <linux/msdos_fs.h>
|
| 20 |
|
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#include <linux/dirent.h>
|
| 21 |
|
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#include <linux/smp_lock.h>
|
| 22 |
|
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#include <linux/buffer_head.h>
|
| 23 |
|
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#include <linux/compat.h>
|
| 24 |
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#include <asm/uaccess.h>
|
| 25 |
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|
| 26 |
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static inline loff_t fat_make_i_pos(struct super_block *sb,
|
| 27 |
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struct buffer_head *bh,
|
| 28 |
|
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struct msdos_dir_entry *de)
|
| 29 |
|
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{
|
| 30 |
|
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return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits)
|
| 31 |
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| (de - (struct msdos_dir_entry *)bh->b_data);
|
| 32 |
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}
|
| 33 |
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|
| 34 |
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static inline void fat_dir_readahead(struct inode *dir, sector_t iblock,
|
| 35 |
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sector_t phys)
|
| 36 |
|
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{
|
| 37 |
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struct super_block *sb = dir->i_sb;
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| 38 |
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struct msdos_sb_info *sbi = MSDOS_SB(sb);
|
| 39 |
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struct buffer_head *bh;
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| 40 |
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int sec;
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| 41 |
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| 42 |
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/* This is not a first sector of cluster, or sec_per_clus == 1 */
|
| 43 |
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if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1)
|
| 44 |
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return;
|
| 45 |
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/* root dir of FAT12/FAT16 */
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| 46 |
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if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO))
|
| 47 |
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return;
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| 48 |
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|
| 49 |
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bh = sb_find_get_block(sb, phys);
|
| 50 |
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if (bh == NULL || !buffer_uptodate(bh)) {
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| 51 |
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for (sec = 0; sec < sbi->sec_per_clus; sec++)
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| 52 |
|
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sb_breadahead(sb, phys + sec);
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| 53 |
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}
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| 54 |
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brelse(bh);
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| 55 |
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}
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| 56 |
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| 57 |
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/* Returns the inode number of the directory entry at offset pos. If bh is
|
| 58 |
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non-NULL, it is brelse'd before. Pos is incremented. The buffer header is
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| 59 |
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returned in bh.
|
| 60 |
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AV. Most often we do it item-by-item. Makes sense to optimize.
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| 61 |
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AV. OK, there we go: if both bh and de are non-NULL we assume that we just
|
| 62 |
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AV. want the next entry (took one explicit de=NULL in vfat/namei.c).
|
| 63 |
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AV. It's done in fat_get_entry() (inlined), here the slow case lives.
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| 64 |
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AV. Additionally, when we return -1 (i.e. reached the end of directory)
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| 65 |
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AV. we make bh NULL.
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| 66 |
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*/
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| 67 |
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static int fat__get_entry(struct inode *dir, loff_t *pos,
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| 68 |
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struct buffer_head **bh, struct msdos_dir_entry **de)
|
| 69 |
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{
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| 70 |
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struct super_block *sb = dir->i_sb;
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| 71 |
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sector_t phys, iblock;
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| 72 |
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unsigned long mapped_blocks;
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| 73 |
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int err, offset;
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| 74 |
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| 75 |
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next:
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| 76 |
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if (*bh)
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| 77 |
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brelse(*bh);
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| 78 |
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| 79 |
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*bh = NULL;
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| 80 |
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iblock = *pos >> sb->s_blocksize_bits;
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| 81 |
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err = fat_bmap(dir, iblock, &phys, &mapped_blocks);
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| 82 |
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if (err || !phys)
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| 83 |
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return -1; /* beyond EOF or error */
|
| 84 |
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|
| 85 |
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fat_dir_readahead(dir, iblock, phys);
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| 86 |
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|
|
| 87 |
|
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*bh = sb_bread(sb, phys);
|
| 88 |
|
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if (*bh == NULL) {
|
| 89 |
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printk(KERN_ERR "FAT: Directory bread(block %llu) failed\n",
|
| 90 |
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(unsigned long long)phys);
|
| 91 |
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/* skip this block */
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| 92 |
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*pos = (iblock + 1) << sb->s_blocksize_bits;
|
| 93 |
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goto next;
|
| 94 |
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}
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| 95 |
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| 96 |
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offset = *pos & (sb->s_blocksize - 1);
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| 97 |
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*pos += sizeof(struct msdos_dir_entry);
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| 98 |
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*de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
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| 99 |
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| 100 |
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return 0;
|
| 101 |
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}
|
| 102 |
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|
| 103 |
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static inline int fat_get_entry(struct inode *dir, loff_t *pos,
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| 104 |
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struct buffer_head **bh,
|
| 105 |
|
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struct msdos_dir_entry **de)
|
| 106 |
|
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{
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| 107 |
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/* Fast stuff first */
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| 108 |
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if (*bh && *de &&
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| 109 |
|
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(*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) {
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| 110 |
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*pos += sizeof(struct msdos_dir_entry);
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| 111 |
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(*de)++;
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| 112 |
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return 0;
|
| 113 |
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}
|
| 114 |
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return fat__get_entry(dir, pos, bh, de);
|
| 115 |
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}
|
| 116 |
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|
| 117 |
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/*
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| 118 |
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* Convert Unicode 16 to UTF-8, translated Unicode, or ASCII.
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| 119 |
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* If uni_xlate is enabled and we can't get a 1:1 conversion, use a
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| 120 |
|
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* colon as an escape character since it is normally invalid on the vfat
|
| 121 |
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* filesystem. The following four characters are the hexadecimal digits
|
| 122 |
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* of Unicode value. This lets us do a full dump and restore of Unicode
|
| 123 |
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* filenames. We could get into some trouble with long Unicode names,
|
| 124 |
|
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* but ignore that right now.
|
| 125 |
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* Ahem... Stack smashing in ring 0 isn't fun. Fixed.
|
| 126 |
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*/
|
| 127 |
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static int uni16_to_x8(unsigned char *ascii, wchar_t *uni, int uni_xlate,
|
| 128 |
|
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struct nls_table *nls)
|
| 129 |
|
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{
|
| 130 |
|
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wchar_t *ip, ec;
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| 131 |
|
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unsigned char *op, nc;
|
| 132 |
|
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int charlen;
|
| 133 |
|
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int k;
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| 134 |
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|
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| 135 |
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ip = uni;
|
| 136 |
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op = ascii;
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| 137 |
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|
|
| 138 |
|
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while (*ip) {
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| 139 |
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ec = *ip++;
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| 140 |
|
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if ( (charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) {
|
| 141 |
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op += charlen;
|
| 142 |
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} else {
|
| 143 |
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if (uni_xlate == 1) {
|
| 144 |
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*op = ':';
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| 145 |
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for (k = 4; k > 0; k--) {
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| 146 |
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nc = ec & 0xF;
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| 147 |
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op[k] = nc > 9 ? nc + ('a' - 10)
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| 148 |
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: nc + '0';
|
| 149 |
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ec >>= 4;
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| 150 |
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}
|
| 151 |
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op += 5;
|
| 152 |
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} else {
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| 153 |
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*op++ = '?';
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| 154 |
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}
|
| 155 |
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}
|
| 156 |
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/* We have some slack there, so it's OK */
|
| 157 |
|
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if (op>ascii+256) {
|
| 158 |
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op = ascii + 256;
|
| 159 |
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break;
|
| 160 |
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}
|
| 161 |
|
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}
|
| 162 |
|
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*op = 0;
|
| 163 |
|
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return (op - ascii);
|
| 164 |
|
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}
|
| 165 |
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|
| 166 |
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static inline int
|
| 167 |
|
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fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
|
| 168 |
|
|
{
|
| 169 |
|
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int charlen;
|
| 170 |
|
|
|
| 171 |
|
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charlen = t->char2uni(c, clen, uni);
|
| 172 |
|
|
if (charlen < 0) {
|
| 173 |
|
|
*uni = 0x003f; /* a question mark */
|
| 174 |
|
|
charlen = 1;
|
| 175 |
|
|
}
|
| 176 |
|
|
return charlen;
|
| 177 |
|
|
}
|
| 178 |
|
|
|
| 179 |
|
|
static inline int
|
| 180 |
|
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fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
|
| 181 |
|
|
{
|
| 182 |
|
|
int charlen;
|
| 183 |
|
|
wchar_t wc;
|
| 184 |
|
|
|
| 185 |
|
|
charlen = t->char2uni(c, clen, &wc);
|
| 186 |
|
|
if (charlen < 0) {
|
| 187 |
|
|
*uni = 0x003f; /* a question mark */
|
| 188 |
|
|
charlen = 1;
|
| 189 |
|
|
} else if (charlen <= 1) {
|
| 190 |
|
|
unsigned char nc = t->charset2lower[*c];
|
| 191 |
|
|
|
| 192 |
|
|
if (!nc)
|
| 193 |
|
|
nc = *c;
|
| 194 |
|
|
|
| 195 |
|
|
if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) {
|
| 196 |
|
|
*uni = 0x003f; /* a question mark */
|
| 197 |
|
|
charlen = 1;
|
| 198 |
|
|
}
|
| 199 |
|
|
} else
|
| 200 |
|
|
*uni = wc;
|
| 201 |
|
|
|
| 202 |
|
|
return charlen;
|
| 203 |
|
|
}
|
| 204 |
|
|
|
| 205 |
|
|
static inline int
|
| 206 |
|
|
fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size,
|
| 207 |
|
|
wchar_t *uni_buf, unsigned short opt, int lower)
|
| 208 |
|
|
{
|
| 209 |
|
|
int len = 0;
|
| 210 |
|
|
|
| 211 |
|
|
if (opt & VFAT_SFN_DISPLAY_LOWER)
|
| 212 |
|
|
len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
|
| 213 |
|
|
else if (opt & VFAT_SFN_DISPLAY_WIN95)
|
| 214 |
|
|
len = fat_short2uni(nls, buf, buf_size, uni_buf);
|
| 215 |
|
|
else if (opt & VFAT_SFN_DISPLAY_WINNT) {
|
| 216 |
|
|
if (lower)
|
| 217 |
|
|
len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
|
| 218 |
|
|
else
|
| 219 |
|
|
len = fat_short2uni(nls, buf, buf_size, uni_buf);
|
| 220 |
|
|
} else
|
| 221 |
|
|
len = fat_short2uni(nls, buf, buf_size, uni_buf);
|
| 222 |
|
|
|
| 223 |
|
|
return len;
|
| 224 |
|
|
}
|
| 225 |
|
|
|
| 226 |
|
|
enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, };
|
| 227 |
|
|
|
| 228 |
|
|
/**
|
| 229 |
|
|
* fat_parse_long - Parse extended directory entry.
|
| 230 |
|
|
*
|
| 231 |
|
|
* This function returns zero on success, negative value on error, or one of
|
| 232 |
|
|
* the following:
|
| 233 |
|
|
*
|
| 234 |
|
|
* %PARSE_INVALID - Directory entry is invalid.
|
| 235 |
|
|
* %PARSE_NOT_LONGNAME - Directory entry does not contain longname.
|
| 236 |
|
|
* %PARSE_EOF - Directory has no more entries.
|
| 237 |
|
|
*/
|
| 238 |
|
|
static int fat_parse_long(struct inode *dir, loff_t *pos,
|
| 239 |
|
|
struct buffer_head **bh, struct msdos_dir_entry **de,
|
| 240 |
|
|
wchar_t **unicode, unsigned char *nr_slots)
|
| 241 |
|
|
{
|
| 242 |
|
|
struct msdos_dir_slot *ds;
|
| 243 |
|
|
unsigned char id, slot, slots, alias_checksum;
|
| 244 |
|
|
|
| 245 |
|
|
if (!*unicode) {
|
| 246 |
|
|
*unicode = (wchar_t *)__get_free_page(GFP_KERNEL);
|
| 247 |
|
|
if (!*unicode) {
|
| 248 |
|
|
brelse(*bh);
|
| 249 |
|
|
return -ENOMEM;
|
| 250 |
|
|
}
|
| 251 |
|
|
}
|
| 252 |
|
|
parse_long:
|
| 253 |
|
|
slots = 0;
|
| 254 |
|
|
ds = (struct msdos_dir_slot *)*de;
|
| 255 |
|
|
id = ds->id;
|
| 256 |
|
|
if (!(id & 0x40))
|
| 257 |
|
|
return PARSE_INVALID;
|
| 258 |
|
|
slots = id & ~0x40;
|
| 259 |
|
|
if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
|
| 260 |
|
|
return PARSE_INVALID;
|
| 261 |
|
|
*nr_slots = slots;
|
| 262 |
|
|
alias_checksum = ds->alias_checksum;
|
| 263 |
|
|
|
| 264 |
|
|
slot = slots;
|
| 265 |
|
|
while (1) {
|
| 266 |
|
|
int offset;
|
| 267 |
|
|
|
| 268 |
|
|
slot--;
|
| 269 |
|
|
offset = slot * 13;
|
| 270 |
|
|
fat16_towchar(*unicode + offset, ds->name0_4, 5);
|
| 271 |
|
|
fat16_towchar(*unicode + offset + 5, ds->name5_10, 6);
|
| 272 |
|
|
fat16_towchar(*unicode + offset + 11, ds->name11_12, 2);
|
| 273 |
|
|
|
| 274 |
|
|
if (ds->id & 0x40)
|
| 275 |
|
|
(*unicode)[offset + 13] = 0;
|
| 276 |
|
|
if (fat_get_entry(dir, pos, bh, de) < 0)
|
| 277 |
|
|
return PARSE_EOF;
|
| 278 |
|
|
if (slot == 0)
|
| 279 |
|
|
break;
|
| 280 |
|
|
ds = (struct msdos_dir_slot *)*de;
|
| 281 |
|
|
if (ds->attr != ATTR_EXT)
|
| 282 |
|
|
return PARSE_NOT_LONGNAME;
|
| 283 |
|
|
if ((ds->id & ~0x40) != slot)
|
| 284 |
|
|
goto parse_long;
|
| 285 |
|
|
if (ds->alias_checksum != alias_checksum)
|
| 286 |
|
|
goto parse_long;
|
| 287 |
|
|
}
|
| 288 |
|
|
if ((*de)->name[0] == DELETED_FLAG)
|
| 289 |
|
|
return PARSE_INVALID;
|
| 290 |
|
|
if ((*de)->attr == ATTR_EXT)
|
| 291 |
|
|
goto parse_long;
|
| 292 |
|
|
if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME))
|
| 293 |
|
|
return PARSE_INVALID;
|
| 294 |
|
|
if (fat_checksum((*de)->name) != alias_checksum)
|
| 295 |
|
|
*nr_slots = 0;
|
| 296 |
|
|
|
| 297 |
|
|
return 0;
|
| 298 |
|
|
}
|
| 299 |
|
|
|
| 300 |
|
|
/*
|
| 301 |
|
|
* Return values: negative -> error, 0 -> not found, positive -> found,
|
| 302 |
|
|
* value is the total amount of slots, including the shortname entry.
|
| 303 |
|
|
*/
|
| 304 |
|
|
int fat_search_long(struct inode *inode, const unsigned char *name,
|
| 305 |
|
|
int name_len, struct fat_slot_info *sinfo)
|
| 306 |
|
|
{
|
| 307 |
|
|
struct super_block *sb = inode->i_sb;
|
| 308 |
|
|
struct msdos_sb_info *sbi = MSDOS_SB(sb);
|
| 309 |
|
|
struct buffer_head *bh = NULL;
|
| 310 |
|
|
struct msdos_dir_entry *de;
|
| 311 |
|
|
struct nls_table *nls_io = sbi->nls_io;
|
| 312 |
|
|
struct nls_table *nls_disk = sbi->nls_disk;
|
| 313 |
|
|
wchar_t bufuname[14];
|
| 314 |
|
|
unsigned char xlate_len, nr_slots;
|
| 315 |
|
|
wchar_t *unicode = NULL;
|
| 316 |
|
|
unsigned char work[MSDOS_NAME], bufname[260]; /* 256 + 4 */
|
| 317 |
|
|
int uni_xlate = sbi->options.unicode_xlate;
|
| 318 |
|
|
int utf8 = sbi->options.utf8;
|
| 319 |
|
|
int anycase = (sbi->options.name_check != 's');
|
| 320 |
|
|
unsigned short opt_shortname = sbi->options.shortname;
|
| 321 |
|
|
loff_t cpos = 0;
|
| 322 |
|
|
int chl, i, j, last_u, err;
|
| 323 |
|
|
|
| 324 |
|
|
err = -ENOENT;
|
| 325 |
|
|
while(1) {
|
| 326 |
|
|
if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
|
| 327 |
|
|
goto EODir;
|
| 328 |
|
|
parse_record:
|
| 329 |
|
|
nr_slots = 0;
|
| 330 |
|
|
if (de->name[0] == DELETED_FLAG)
|
| 331 |
|
|
continue;
|
| 332 |
|
|
if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
|
| 333 |
|
|
continue;
|
| 334 |
|
|
if (de->attr != ATTR_EXT && IS_FREE(de->name))
|
| 335 |
|
|
continue;
|
| 336 |
|
|
if (de->attr == ATTR_EXT) {
|
| 337 |
|
|
int status = fat_parse_long(inode, &cpos, &bh, &de,
|
| 338 |
|
|
&unicode, &nr_slots);
|
| 339 |
|
|
if (status < 0)
|
| 340 |
|
|
return status;
|
| 341 |
|
|
else if (status == PARSE_INVALID)
|
| 342 |
|
|
continue;
|
| 343 |
|
|
else if (status == PARSE_NOT_LONGNAME)
|
| 344 |
|
|
goto parse_record;
|
| 345 |
|
|
else if (status == PARSE_EOF)
|
| 346 |
|
|
goto EODir;
|
| 347 |
|
|
}
|
| 348 |
|
|
|
| 349 |
|
|
memcpy(work, de->name, sizeof(de->name));
|
| 350 |
|
|
/* see namei.c, msdos_format_name */
|
| 351 |
|
|
if (work[0] == 0x05)
|
| 352 |
|
|
work[0] = 0xE5;
|
| 353 |
|
|
for (i = 0, j = 0, last_u = 0; i < 8;) {
|
| 354 |
|
|
if (!work[i])
|
| 355 |
|
|
break;
|
| 356 |
|
|
chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
|
| 357 |
|
|
&bufuname[j++], opt_shortname,
|
| 358 |
|
|
de->lcase & CASE_LOWER_BASE);
|
| 359 |
|
|
if (chl <= 1) {
|
| 360 |
|
|
if (work[i] != ' ')
|
| 361 |
|
|
last_u = j;
|
| 362 |
|
|
} else {
|
| 363 |
|
|
last_u = j;
|
| 364 |
|
|
}
|
| 365 |
|
|
i += chl;
|
| 366 |
|
|
}
|
| 367 |
|
|
j = last_u;
|
| 368 |
|
|
fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
|
| 369 |
|
|
for (i = 8; i < MSDOS_NAME;) {
|
| 370 |
|
|
if (!work[i])
|
| 371 |
|
|
break;
|
| 372 |
|
|
chl = fat_shortname2uni(nls_disk, &work[i],
|
| 373 |
|
|
MSDOS_NAME - i,
|
| 374 |
|
|
&bufuname[j++], opt_shortname,
|
| 375 |
|
|
de->lcase & CASE_LOWER_EXT);
|
| 376 |
|
|
if (chl <= 1) {
|
| 377 |
|
|
if (work[i] != ' ')
|
| 378 |
|
|
last_u = j;
|
| 379 |
|
|
} else {
|
| 380 |
|
|
last_u = j;
|
| 381 |
|
|
}
|
| 382 |
|
|
i += chl;
|
| 383 |
|
|
}
|
| 384 |
|
|
if (!last_u)
|
| 385 |
|
|
continue;
|
| 386 |
|
|
|
| 387 |
|
|
bufuname[last_u] = 0x0000;
|
| 388 |
|
|
xlate_len = utf8
|
| 389 |
|
|
?utf8_wcstombs(bufname, bufuname, sizeof(bufname))
|
| 390 |
|
|
:uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
|
| 391 |
|
|
if (xlate_len == name_len)
|
| 392 |
|
|
if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
|
| 393 |
|
|
(anycase && !nls_strnicmp(nls_io, name, bufname,
|
| 394 |
|
|
xlate_len)))
|
| 395 |
|
|
goto Found;
|
| 396 |
|
|
|
| 397 |
|
|
if (nr_slots) {
|
| 398 |
|
|
xlate_len = utf8
|
| 399 |
|
|
?utf8_wcstombs(bufname, unicode, sizeof(bufname))
|
| 400 |
|
|
:uni16_to_x8(bufname, unicode, uni_xlate, nls_io);
|
| 401 |
|
|
if (xlate_len != name_len)
|
| 402 |
|
|
continue;
|
| 403 |
|
|
if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
|
| 404 |
|
|
(anycase && !nls_strnicmp(nls_io, name, bufname,
|
| 405 |
|
|
xlate_len)))
|
| 406 |
|
|
goto Found;
|
| 407 |
|
|
}
|
| 408 |
|
|
}
|
| 409 |
|
|
|
| 410 |
|
|
Found:
|
| 411 |
|
|
nr_slots++; /* include the de */
|
| 412 |
|
|
sinfo->slot_off = cpos - nr_slots * sizeof(*de);
|
| 413 |
|
|
sinfo->nr_slots = nr_slots;
|
| 414 |
|
|
sinfo->de = de;
|
| 415 |
|
|
sinfo->bh = bh;
|
| 416 |
|
|
sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
|
| 417 |
|
|
err = 0;
|
| 418 |
|
|
EODir:
|
| 419 |
|
|
if (unicode)
|
| 420 |
|
|
free_page((unsigned long)unicode);
|
| 421 |
|
|
|
| 422 |
|
|
return err;
|
| 423 |
|
|
}
|
| 424 |
|
|
|
| 425 |
|
|
EXPORT_SYMBOL_GPL(fat_search_long);
|
| 426 |
|
|
|
| 427 |
|
|
struct fat_ioctl_filldir_callback {
|
| 428 |
|
|
void __user *dirent;
|
| 429 |
|
|
int result;
|
| 430 |
|
|
/* for dir ioctl */
|
| 431 |
|
|
const char *longname;
|
| 432 |
|
|
int long_len;
|
| 433 |
|
|
const char *shortname;
|
| 434 |
|
|
int short_len;
|
| 435 |
|
|
};
|
| 436 |
|
|
|
| 437 |
|
|
static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent,
|
| 438 |
|
|
filldir_t filldir, int short_only, int both)
|
| 439 |
|
|
{
|
| 440 |
|
|
struct super_block *sb = inode->i_sb;
|
| 441 |
|
|
struct msdos_sb_info *sbi = MSDOS_SB(sb);
|
| 442 |
|
|
struct buffer_head *bh;
|
| 443 |
|
|
struct msdos_dir_entry *de;
|
| 444 |
|
|
struct nls_table *nls_io = sbi->nls_io;
|
| 445 |
|
|
struct nls_table *nls_disk = sbi->nls_disk;
|
| 446 |
|
|
unsigned char long_slots;
|
| 447 |
|
|
const char *fill_name;
|
| 448 |
|
|
int fill_len;
|
| 449 |
|
|
wchar_t bufuname[14];
|
| 450 |
|
|
wchar_t *unicode = NULL;
|
| 451 |
|
|
unsigned char c, work[MSDOS_NAME], bufname[56], *ptname = bufname;
|
| 452 |
|
|
unsigned long lpos, dummy, *furrfu = &lpos;
|
| 453 |
|
|
int uni_xlate = sbi->options.unicode_xlate;
|
| 454 |
|
|
int isvfat = sbi->options.isvfat;
|
| 455 |
|
|
int utf8 = sbi->options.utf8;
|
| 456 |
|
|
int nocase = sbi->options.nocase;
|
| 457 |
|
|
unsigned short opt_shortname = sbi->options.shortname;
|
| 458 |
|
|
unsigned long inum;
|
| 459 |
|
|
int chi, chl, i, i2, j, last, last_u, dotoffset = 0;
|
| 460 |
|
|
loff_t cpos;
|
| 461 |
|
|
int ret = 0;
|
| 462 |
|
|
|
| 463 |
|
|
lock_kernel();
|
| 464 |
|
|
|
| 465 |
|
|
cpos = filp->f_pos;
|
| 466 |
|
|
/* Fake . and .. for the root directory. */
|
| 467 |
|
|
if (inode->i_ino == MSDOS_ROOT_INO) {
|
| 468 |
|
|
while (cpos < 2) {
|
| 469 |
|
|
if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0)
|
| 470 |
|
|
goto out;
|
| 471 |
|
|
cpos++;
|
| 472 |
|
|
filp->f_pos++;
|
| 473 |
|
|
}
|
| 474 |
|
|
if (cpos == 2) {
|
| 475 |
|
|
dummy = 2;
|
| 476 |
|
|
furrfu = &dummy;
|
| 477 |
|
|
cpos = 0;
|
| 478 |
|
|
}
|
| 479 |
|
|
}
|
| 480 |
|
|
if (cpos & (sizeof(struct msdos_dir_entry)-1)) {
|
| 481 |
|
|
ret = -ENOENT;
|
| 482 |
|
|
goto out;
|
| 483 |
|
|
}
|
| 484 |
|
|
|
| 485 |
|
|
bh = NULL;
|
| 486 |
|
|
GetNew:
|
| 487 |
|
|
if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
|
| 488 |
|
|
goto EODir;
|
| 489 |
|
|
parse_record:
|
| 490 |
|
|
long_slots = 0;
|
| 491 |
|
|
/* Check for long filename entry */
|
| 492 |
|
|
if (isvfat) {
|
| 493 |
|
|
if (de->name[0] == DELETED_FLAG)
|
| 494 |
|
|
goto RecEnd;
|
| 495 |
|
|
if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
|
| 496 |
|
|
goto RecEnd;
|
| 497 |
|
|
if (de->attr != ATTR_EXT && IS_FREE(de->name))
|
| 498 |
|
|
goto RecEnd;
|
| 499 |
|
|
} else {
|
| 500 |
|
|
if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name))
|
| 501 |
|
|
goto RecEnd;
|
| 502 |
|
|
}
|
| 503 |
|
|
|
| 504 |
|
|
if (isvfat && de->attr == ATTR_EXT) {
|
| 505 |
|
|
int status = fat_parse_long(inode, &cpos, &bh, &de,
|
| 506 |
|
|
&unicode, &long_slots);
|
| 507 |
|
|
if (status < 0) {
|
| 508 |
|
|
filp->f_pos = cpos;
|
| 509 |
|
|
ret = status;
|
| 510 |
|
|
goto out;
|
| 511 |
|
|
} else if (status == PARSE_INVALID)
|
| 512 |
|
|
goto RecEnd;
|
| 513 |
|
|
else if (status == PARSE_NOT_LONGNAME)
|
| 514 |
|
|
goto parse_record;
|
| 515 |
|
|
else if (status == PARSE_EOF)
|
| 516 |
|
|
goto EODir;
|
| 517 |
|
|
}
|
| 518 |
|
|
|
| 519 |
|
|
if (sbi->options.dotsOK) {
|
| 520 |
|
|
ptname = bufname;
|
| 521 |
|
|
dotoffset = 0;
|
| 522 |
|
|
if (de->attr & ATTR_HIDDEN) {
|
| 523 |
|
|
*ptname++ = '.';
|
| 524 |
|
|
dotoffset = 1;
|
| 525 |
|
|
}
|
| 526 |
|
|
}
|
| 527 |
|
|
|
| 528 |
|
|
memcpy(work, de->name, sizeof(de->name));
|
| 529 |
|
|
/* see namei.c, msdos_format_name */
|
| 530 |
|
|
if (work[0] == 0x05)
|
| 531 |
|
|
work[0] = 0xE5;
|
| 532 |
|
|
for (i = 0, j = 0, last = 0, last_u = 0; i < 8;) {
|
| 533 |
|
|
if (!(c = work[i]))
|
| 534 |
|
|
break;
|
| 535 |
|
|
chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
|
| 536 |
|
|
&bufuname[j++], opt_shortname,
|
| 537 |
|
|
de->lcase & CASE_LOWER_BASE);
|
| 538 |
|
|
if (chl <= 1) {
|
| 539 |
|
|
ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
|
| 540 |
|
|
if (c != ' ') {
|
| 541 |
|
|
last = i;
|
| 542 |
|
|
last_u = j;
|
| 543 |
|
|
}
|
| 544 |
|
|
} else {
|
| 545 |
|
|
last_u = j;
|
| 546 |
|
|
for (chi = 0; chi < chl && i < 8; chi++) {
|
| 547 |
|
|
ptname[i] = work[i];
|
| 548 |
|
|
i++; last = i;
|
| 549 |
|
|
}
|
| 550 |
|
|
}
|
| 551 |
|
|
}
|
| 552 |
|
|
i = last;
|
| 553 |
|
|
j = last_u;
|
| 554 |
|
|
fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
|
| 555 |
|
|
ptname[i++] = '.';
|
| 556 |
|
|
for (i2 = 8; i2 < MSDOS_NAME;) {
|
| 557 |
|
|
if (!(c = work[i2]))
|
| 558 |
|
|
break;
|
| 559 |
|
|
chl = fat_shortname2uni(nls_disk, &work[i2], MSDOS_NAME - i2,
|
| 560 |
|
|
&bufuname[j++], opt_shortname,
|
| 561 |
|
|
de->lcase & CASE_LOWER_EXT);
|
| 562 |
|
|
if (chl <= 1) {
|
| 563 |
|
|
i2++;
|
| 564 |
|
|
ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
|
| 565 |
|
|
if (c != ' ') {
|
| 566 |
|
|
last = i;
|
| 567 |
|
|
last_u = j;
|
| 568 |
|
|
}
|
| 569 |
|
|
} else {
|
| 570 |
|
|
last_u = j;
|
| 571 |
|
|
for (chi = 0; chi < chl && i2 < MSDOS_NAME; chi++) {
|
| 572 |
|
|
ptname[i++] = work[i2++];
|
| 573 |
|
|
last = i;
|
| 574 |
|
|
}
|
| 575 |
|
|
}
|
| 576 |
|
|
}
|
| 577 |
|
|
if (!last)
|
| 578 |
|
|
goto RecEnd;
|
| 579 |
|
|
|
| 580 |
|
|
i = last + dotoffset;
|
| 581 |
|
|
j = last_u;
|
| 582 |
|
|
|
| 583 |
|
|
lpos = cpos - (long_slots+1)*sizeof(struct msdos_dir_entry);
|
| 584 |
|
|
if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME))
|
| 585 |
|
|
inum = inode->i_ino;
|
| 586 |
|
|
else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
|
| 587 |
|
|
inum = parent_ino(filp->f_path.dentry);
|
| 588 |
|
|
} else {
|
| 589 |
|
|
loff_t i_pos = fat_make_i_pos(sb, bh, de);
|
| 590 |
|
|
struct inode *tmp = fat_iget(sb, i_pos);
|
| 591 |
|
|
if (tmp) {
|
| 592 |
|
|
inum = tmp->i_ino;
|
| 593 |
|
|
iput(tmp);
|
| 594 |
|
|
} else
|
| 595 |
|
|
inum = iunique(sb, MSDOS_ROOT_INO);
|
| 596 |
|
|
}
|
| 597 |
|
|
|
| 598 |
|
|
if (isvfat) {
|
| 599 |
|
|
bufuname[j] = 0x0000;
|
| 600 |
|
|
i = utf8 ? utf8_wcstombs(bufname, bufuname, sizeof(bufname))
|
| 601 |
|
|
: uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
|
| 602 |
|
|
}
|
| 603 |
|
|
|
| 604 |
|
|
fill_name = bufname;
|
| 605 |
|
|
fill_len = i;
|
| 606 |
|
|
if (!short_only && long_slots) {
|
| 607 |
|
|
/* convert the unicode long name. 261 is maximum size
|
| 608 |
|
|
* of unicode buffer. (13 * slots + nul) */
|
| 609 |
|
|
void *longname = unicode + 261;
|
| 610 |
|
|
int buf_size = PAGE_SIZE - (261 * sizeof(unicode[0]));
|
| 611 |
|
|
int long_len = utf8
|
| 612 |
|
|
? utf8_wcstombs(longname, unicode, buf_size)
|
| 613 |
|
|
: uni16_to_x8(longname, unicode, uni_xlate, nls_io);
|
| 614 |
|
|
|
| 615 |
|
|
if (!both) {
|
| 616 |
|
|
fill_name = longname;
|
| 617 |
|
|
fill_len = long_len;
|
| 618 |
|
|
} else {
|
| 619 |
|
|
/* hack for fat_ioctl_filldir() */
|
| 620 |
|
|
struct fat_ioctl_filldir_callback *p = dirent;
|
| 621 |
|
|
|
| 622 |
|
|
p->longname = longname;
|
| 623 |
|
|
p->long_len = long_len;
|
| 624 |
|
|
p->shortname = bufname;
|
| 625 |
|
|
p->short_len = i;
|
| 626 |
|
|
fill_name = NULL;
|
| 627 |
|
|
fill_len = 0;
|
| 628 |
|
|
}
|
| 629 |
|
|
}
|
| 630 |
|
|
if (filldir(dirent, fill_name, fill_len, *furrfu, inum,
|
| 631 |
|
|
(de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0)
|
| 632 |
|
|
goto FillFailed;
|
| 633 |
|
|
|
| 634 |
|
|
RecEnd:
|
| 635 |
|
|
furrfu = &lpos;
|
| 636 |
|
|
filp->f_pos = cpos;
|
| 637 |
|
|
goto GetNew;
|
| 638 |
|
|
EODir:
|
| 639 |
|
|
filp->f_pos = cpos;
|
| 640 |
|
|
FillFailed:
|
| 641 |
|
|
brelse(bh);
|
| 642 |
|
|
if (unicode)
|
| 643 |
|
|
free_page((unsigned long)unicode);
|
| 644 |
|
|
out:
|
| 645 |
|
|
unlock_kernel();
|
| 646 |
|
|
return ret;
|
| 647 |
|
|
}
|
| 648 |
|
|
|
| 649 |
|
|
static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
| 650 |
|
|
{
|
| 651 |
|
|
struct inode *inode = filp->f_path.dentry->d_inode;
|
| 652 |
|
|
return __fat_readdir(inode, filp, dirent, filldir, 0, 0);
|
| 653 |
|
|
}
|
| 654 |
|
|
|
| 655 |
|
|
#define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \
|
| 656 |
|
|
static int func(void *__buf, const char *name, int name_len, \
|
| 657 |
|
|
loff_t offset, u64 ino, unsigned int d_type) \
|
| 658 |
|
|
{ \
|
| 659 |
|
|
struct fat_ioctl_filldir_callback *buf = __buf; \
|
| 660 |
|
|
struct dirent_type __user *d1 = buf->dirent; \
|
| 661 |
|
|
struct dirent_type __user *d2 = d1 + 1; \
|
| 662 |
|
|
\
|
| 663 |
|
|
if (buf->result) \
|
| 664 |
|
|
return -EINVAL; \
|
| 665 |
|
|
buf->result++; \
|
| 666 |
|
|
\
|
| 667 |
|
|
if (name != NULL) { \
|
| 668 |
|
|
/* dirent has only short name */ \
|
| 669 |
|
|
if (name_len >= sizeof(d1->d_name)) \
|
| 670 |
|
|
name_len = sizeof(d1->d_name) - 1; \
|
| 671 |
|
|
\
|
| 672 |
|
|
if (put_user(0, d2->d_name) || \
|
| 673 |
|
|
put_user(0, &d2->d_reclen) || \
|
| 674 |
|
|
copy_to_user(d1->d_name, name, name_len) || \
|
| 675 |
|
|
put_user(0, d1->d_name + name_len) || \
|
| 676 |
|
|
put_user(name_len, &d1->d_reclen)) \
|
| 677 |
|
|
goto efault; \
|
| 678 |
|
|
} else { \
|
| 679 |
|
|
/* dirent has short and long name */ \
|
| 680 |
|
|
const char *longname = buf->longname; \
|
| 681 |
|
|
int long_len = buf->long_len; \
|
| 682 |
|
|
const char *shortname = buf->shortname; \
|
| 683 |
|
|
int short_len = buf->short_len; \
|
| 684 |
|
|
\
|
| 685 |
|
|
if (long_len >= sizeof(d1->d_name)) \
|
| 686 |
|
|
long_len = sizeof(d1->d_name) - 1; \
|
| 687 |
|
|
if (short_len >= sizeof(d1->d_name)) \
|
| 688 |
|
|
short_len = sizeof(d1->d_name) - 1; \
|
| 689 |
|
|
\
|
| 690 |
|
|
if (copy_to_user(d2->d_name, longname, long_len) || \
|
| 691 |
|
|
put_user(0, d2->d_name + long_len) || \
|
| 692 |
|
|
put_user(long_len, &d2->d_reclen) || \
|
| 693 |
|
|
put_user(ino, &d2->d_ino) || \
|
| 694 |
|
|
put_user(offset, &d2->d_off) || \
|
| 695 |
|
|
copy_to_user(d1->d_name, shortname, short_len) || \
|
| 696 |
|
|
put_user(0, d1->d_name + short_len) || \
|
| 697 |
|
|
put_user(short_len, &d1->d_reclen)) \
|
| 698 |
|
|
goto efault; \
|
| 699 |
|
|
} \
|
| 700 |
|
|
return 0; \
|
| 701 |
|
|
efault: \
|
| 702 |
|
|
buf->result = -EFAULT; \
|
| 703 |
|
|
return -EFAULT; \
|
| 704 |
|
|
}
|
| 705 |
|
|
|
| 706 |
|
|
FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, dirent)
|
| 707 |
|
|
|
| 708 |
|
|
static int fat_ioctl_readdir(struct inode *inode, struct file *filp,
|
| 709 |
|
|
void __user *dirent, filldir_t filldir,
|
| 710 |
|
|
int short_only, int both)
|
| 711 |
|
|
{
|
| 712 |
|
|
struct fat_ioctl_filldir_callback buf;
|
| 713 |
|
|
int ret;
|
| 714 |
|
|
|
| 715 |
|
|
buf.dirent = dirent;
|
| 716 |
|
|
buf.result = 0;
|
| 717 |
|
|
mutex_lock(&inode->i_mutex);
|
| 718 |
|
|
ret = -ENOENT;
|
| 719 |
|
|
if (!IS_DEADDIR(inode)) {
|
| 720 |
|
|
ret = __fat_readdir(inode, filp, &buf, filldir,
|
| 721 |
|
|
short_only, both);
|
| 722 |
|
|
}
|
| 723 |
|
|
mutex_unlock(&inode->i_mutex);
|
| 724 |
|
|
if (ret >= 0)
|
| 725 |
|
|
ret = buf.result;
|
| 726 |
|
|
return ret;
|
| 727 |
|
|
}
|
| 728 |
|
|
|
| 729 |
|
|
static int fat_dir_ioctl(struct inode *inode, struct file *filp,
|
| 730 |
|
|
unsigned int cmd, unsigned long arg)
|
| 731 |
|
|
{
|
| 732 |
|
|
struct dirent __user *d1 = (struct dirent __user *)arg;
|
| 733 |
|
|
int short_only, both;
|
| 734 |
|
|
|
| 735 |
|
|
switch (cmd) {
|
| 736 |
|
|
case VFAT_IOCTL_READDIR_SHORT:
|
| 737 |
|
|
short_only = 1;
|
| 738 |
|
|
both = 0;
|
| 739 |
|
|
break;
|
| 740 |
|
|
case VFAT_IOCTL_READDIR_BOTH:
|
| 741 |
|
|
short_only = 0;
|
| 742 |
|
|
both = 1;
|
| 743 |
|
|
break;
|
| 744 |
|
|
default:
|
| 745 |
|
|
return fat_generic_ioctl(inode, filp, cmd, arg);
|
| 746 |
|
|
}
|
| 747 |
|
|
|
| 748 |
|
|
if (!access_ok(VERIFY_WRITE, d1, sizeof(struct dirent[2])))
|
| 749 |
|
|
return -EFAULT;
|
| 750 |
|
|
/*
|
| 751 |
|
|
* Yes, we don't need this put_user() absolutely. However old
|
| 752 |
|
|
* code didn't return the right value. So, app use this value,
|
| 753 |
|
|
* in order to check whether it is EOF.
|
| 754 |
|
|
*/
|
| 755 |
|
|
if (put_user(0, &d1->d_reclen))
|
| 756 |
|
|
return -EFAULT;
|
| 757 |
|
|
|
| 758 |
|
|
return fat_ioctl_readdir(inode, filp, d1, fat_ioctl_filldir,
|
| 759 |
|
|
short_only, both);
|
| 760 |
|
|
}
|
| 761 |
|
|
|
| 762 |
|
|
#ifdef CONFIG_COMPAT
|
| 763 |
|
|
#define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2])
|
| 764 |
|
|
#define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2])
|
| 765 |
|
|
|
| 766 |
|
|
FAT_IOCTL_FILLDIR_FUNC(fat_compat_ioctl_filldir, compat_dirent)
|
| 767 |
|
|
|
| 768 |
|
|
static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd,
|
| 769 |
|
|
unsigned long arg)
|
| 770 |
|
|
{
|
| 771 |
|
|
struct inode *inode = filp->f_path.dentry->d_inode;
|
| 772 |
|
|
struct compat_dirent __user *d1 = compat_ptr(arg);
|
| 773 |
|
|
int short_only, both;
|
| 774 |
|
|
|
| 775 |
|
|
switch (cmd) {
|
| 776 |
|
|
case VFAT_IOCTL_READDIR_SHORT32:
|
| 777 |
|
|
short_only = 1;
|
| 778 |
|
|
both = 0;
|
| 779 |
|
|
break;
|
| 780 |
|
|
case VFAT_IOCTL_READDIR_BOTH32:
|
| 781 |
|
|
short_only = 0;
|
| 782 |
|
|
both = 1;
|
| 783 |
|
|
break;
|
| 784 |
|
|
default:
|
| 785 |
|
|
return -ENOIOCTLCMD;
|
| 786 |
|
|
}
|
| 787 |
|
|
|
| 788 |
|
|
if (!access_ok(VERIFY_WRITE, d1, sizeof(struct compat_dirent[2])))
|
| 789 |
|
|
return -EFAULT;
|
| 790 |
|
|
/*
|
| 791 |
|
|
* Yes, we don't need this put_user() absolutely. However old
|
| 792 |
|
|
* code didn't return the right value. So, app use this value,
|
| 793 |
|
|
* in order to check whether it is EOF.
|
| 794 |
|
|
*/
|
| 795 |
|
|
if (put_user(0, &d1->d_reclen))
|
| 796 |
|
|
return -EFAULT;
|
| 797 |
|
|
|
| 798 |
|
|
return fat_ioctl_readdir(inode, filp, d1, fat_compat_ioctl_filldir,
|
| 799 |
|
|
short_only, both);
|
| 800 |
|
|
}
|
| 801 |
|
|
#endif /* CONFIG_COMPAT */
|
| 802 |
|
|
|
| 803 |
|
|
const struct file_operations fat_dir_operations = {
|
| 804 |
|
|
.read = generic_read_dir,
|
| 805 |
|
|
.readdir = fat_readdir,
|
| 806 |
|
|
.ioctl = fat_dir_ioctl,
|
| 807 |
|
|
#ifdef CONFIG_COMPAT
|
| 808 |
|
|
.compat_ioctl = fat_compat_dir_ioctl,
|
| 809 |
|
|
#endif
|
| 810 |
|
|
.fsync = file_fsync,
|
| 811 |
|
|
};
|
| 812 |
|
|
|
| 813 |
|
|
static int fat_get_short_entry(struct inode *dir, loff_t *pos,
|
| 814 |
|
|
struct buffer_head **bh,
|
| 815 |
|
|
struct msdos_dir_entry **de)
|
| 816 |
|
|
{
|
| 817 |
|
|
while (fat_get_entry(dir, pos, bh, de) >= 0) {
|
| 818 |
|
|
/* free entry or long name entry or volume label */
|
| 819 |
|
|
if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME))
|
| 820 |
|
|
return 0;
|
| 821 |
|
|
}
|
| 822 |
|
|
return -ENOENT;
|
| 823 |
|
|
}
|
| 824 |
|
|
|
| 825 |
|
|
/*
|
| 826 |
|
|
* The ".." entry can not provide the "struct fat_slot_info" informations
|
| 827 |
|
|
* for inode. So, this function provide the some informations only.
|
| 828 |
|
|
*/
|
| 829 |
|
|
int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
|
| 830 |
|
|
struct msdos_dir_entry **de, loff_t *i_pos)
|
| 831 |
|
|
{
|
| 832 |
|
|
loff_t offset;
|
| 833 |
|
|
|
| 834 |
|
|
offset = 0;
|
| 835 |
|
|
*bh = NULL;
|
| 836 |
|
|
while (fat_get_short_entry(dir, &offset, bh, de) >= 0) {
|
| 837 |
|
|
if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) {
|
| 838 |
|
|
*i_pos = fat_make_i_pos(dir->i_sb, *bh, *de);
|
| 839 |
|
|
return 0;
|
| 840 |
|
|
}
|
| 841 |
|
|
}
|
| 842 |
|
|
return -ENOENT;
|
| 843 |
|
|
}
|
| 844 |
|
|
|
| 845 |
|
|
EXPORT_SYMBOL_GPL(fat_get_dotdot_entry);
|
| 846 |
|
|
|
| 847 |
|
|
/* See if directory is empty */
|
| 848 |
|
|
int fat_dir_empty(struct inode *dir)
|
| 849 |
|
|
{
|
| 850 |
|
|
struct buffer_head *bh;
|
| 851 |
|
|
struct msdos_dir_entry *de;
|
| 852 |
|
|
loff_t cpos;
|
| 853 |
|
|
int result = 0;
|
| 854 |
|
|
|
| 855 |
|
|
bh = NULL;
|
| 856 |
|
|
cpos = 0;
|
| 857 |
|
|
while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
|
| 858 |
|
|
if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) &&
|
| 859 |
|
|
strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
|
| 860 |
|
|
result = -ENOTEMPTY;
|
| 861 |
|
|
break;
|
| 862 |
|
|
}
|
| 863 |
|
|
}
|
| 864 |
|
|
brelse(bh);
|
| 865 |
|
|
return result;
|
| 866 |
|
|
}
|
| 867 |
|
|
|
| 868 |
|
|
EXPORT_SYMBOL_GPL(fat_dir_empty);
|
| 869 |
|
|
|
| 870 |
|
|
/*
|
| 871 |
|
|
* fat_subdirs counts the number of sub-directories of dir. It can be run
|
| 872 |
|
|
* on directories being created.
|
| 873 |
|
|
*/
|
| 874 |
|
|
int fat_subdirs(struct inode *dir)
|
| 875 |
|
|
{
|
| 876 |
|
|
struct buffer_head *bh;
|
| 877 |
|
|
struct msdos_dir_entry *de;
|
| 878 |
|
|
loff_t cpos;
|
| 879 |
|
|
int count = 0;
|
| 880 |
|
|
|
| 881 |
|
|
bh = NULL;
|
| 882 |
|
|
cpos = 0;
|
| 883 |
|
|
while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
|
| 884 |
|
|
if (de->attr & ATTR_DIR)
|
| 885 |
|
|
count++;
|
| 886 |
|
|
}
|
| 887 |
|
|
brelse(bh);
|
| 888 |
|
|
return count;
|
| 889 |
|
|
}
|
| 890 |
|
|
|
| 891 |
|
|
/*
|
| 892 |
|
|
* Scans a directory for a given file (name points to its formatted name).
|
| 893 |
|
|
* Returns an error code or zero.
|
| 894 |
|
|
*/
|
| 895 |
|
|
int fat_scan(struct inode *dir, const unsigned char *name,
|
| 896 |
|
|
struct fat_slot_info *sinfo)
|
| 897 |
|
|
{
|
| 898 |
|
|
struct super_block *sb = dir->i_sb;
|
| 899 |
|
|
|
| 900 |
|
|
sinfo->slot_off = 0;
|
| 901 |
|
|
sinfo->bh = NULL;
|
| 902 |
|
|
while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh,
|
| 903 |
|
|
&sinfo->de) >= 0) {
|
| 904 |
|
|
if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) {
|
| 905 |
|
|
sinfo->slot_off -= sizeof(*sinfo->de);
|
| 906 |
|
|
sinfo->nr_slots = 1;
|
| 907 |
|
|
sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
|
| 908 |
|
|
return 0;
|
| 909 |
|
|
}
|
| 910 |
|
|
}
|
| 911 |
|
|
return -ENOENT;
|
| 912 |
|
|
}
|
| 913 |
|
|
|
| 914 |
|
|
EXPORT_SYMBOL_GPL(fat_scan);
|
| 915 |
|
|
|
| 916 |
|
|
static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots)
|
| 917 |
|
|
{
|
| 918 |
|
|
struct super_block *sb = dir->i_sb;
|
| 919 |
|
|
struct buffer_head *bh;
|
| 920 |
|
|
struct msdos_dir_entry *de, *endp;
|
| 921 |
|
|
int err = 0, orig_slots;
|
| 922 |
|
|
|
| 923 |
|
|
while (nr_slots) {
|
| 924 |
|
|
bh = NULL;
|
| 925 |
|
|
if (fat_get_entry(dir, &pos, &bh, &de) < 0) {
|
| 926 |
|
|
err = -EIO;
|
| 927 |
|
|
break;
|
| 928 |
|
|
}
|
| 929 |
|
|
|
| 930 |
|
|
orig_slots = nr_slots;
|
| 931 |
|
|
endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize);
|
| 932 |
|
|
while (nr_slots && de < endp) {
|
| 933 |
|
|
de->name[0] = DELETED_FLAG;
|
| 934 |
|
|
de++;
|
| 935 |
|
|
nr_slots--;
|
| 936 |
|
|
}
|
| 937 |
|
|
mark_buffer_dirty(bh);
|
| 938 |
|
|
if (IS_DIRSYNC(dir))
|
| 939 |
|
|
err = sync_dirty_buffer(bh);
|
| 940 |
|
|
brelse(bh);
|
| 941 |
|
|
if (err)
|
| 942 |
|
|
break;
|
| 943 |
|
|
|
| 944 |
|
|
/* pos is *next* de's position, so this does `- sizeof(de)' */
|
| 945 |
|
|
pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de);
|
| 946 |
|
|
}
|
| 947 |
|
|
|
| 948 |
|
|
return err;
|
| 949 |
|
|
}
|
| 950 |
|
|
|
| 951 |
|
|
int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
|
| 952 |
|
|
{
|
| 953 |
|
|
struct msdos_dir_entry *de;
|
| 954 |
|
|
struct buffer_head *bh;
|
| 955 |
|
|
int err = 0, nr_slots;
|
| 956 |
|
|
|
| 957 |
|
|
/*
|
| 958 |
|
|
* First stage: Remove the shortname. By this, the directory
|
| 959 |
|
|
* entry is removed.
|
| 960 |
|
|
*/
|
| 961 |
|
|
nr_slots = sinfo->nr_slots;
|
| 962 |
|
|
de = sinfo->de;
|
| 963 |
|
|
sinfo->de = NULL;
|
| 964 |
|
|
bh = sinfo->bh;
|
| 965 |
|
|
sinfo->bh = NULL;
|
| 966 |
|
|
while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) {
|
| 967 |
|
|
de->name[0] = DELETED_FLAG;
|
| 968 |
|
|
de--;
|
| 969 |
|
|
nr_slots--;
|
| 970 |
|
|
}
|
| 971 |
|
|
mark_buffer_dirty(bh);
|
| 972 |
|
|
if (IS_DIRSYNC(dir))
|
| 973 |
|
|
err = sync_dirty_buffer(bh);
|
| 974 |
|
|
brelse(bh);
|
| 975 |
|
|
if (err)
|
| 976 |
|
|
return err;
|
| 977 |
|
|
dir->i_version++;
|
| 978 |
|
|
|
| 979 |
|
|
if (nr_slots) {
|
| 980 |
|
|
/*
|
| 981 |
|
|
* Second stage: remove the remaining longname slots.
|
| 982 |
|
|
* (This directory entry is already removed, and so return
|
| 983 |
|
|
* the success)
|
| 984 |
|
|
*/
|
| 985 |
|
|
err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots);
|
| 986 |
|
|
if (err) {
|
| 987 |
|
|
printk(KERN_WARNING
|
| 988 |
|
|
"FAT: Couldn't remove the long name slots\n");
|
| 989 |
|
|
}
|
| 990 |
|
|
}
|
| 991 |
|
|
|
| 992 |
|
|
dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC;
|
| 993 |
|
|
if (IS_DIRSYNC(dir))
|
| 994 |
|
|
(void)fat_sync_inode(dir);
|
| 995 |
|
|
else
|
| 996 |
|
|
mark_inode_dirty(dir);
|
| 997 |
|
|
|
| 998 |
|
|
return 0;
|
| 999 |
|
|
}
|
| 1000 |
|
|
|
| 1001 |
|
|
EXPORT_SYMBOL_GPL(fat_remove_entries);
|
| 1002 |
|
|
|
| 1003 |
|
|
static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
|
| 1004 |
|
|
struct buffer_head **bhs, int nr_bhs)
|
| 1005 |
|
|
{
|
| 1006 |
|
|
struct super_block *sb = dir->i_sb;
|
| 1007 |
|
|
sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus;
|
| 1008 |
|
|
int err, i, n;
|
| 1009 |
|
|
|
| 1010 |
|
|
/* Zeroing the unused blocks on this cluster */
|
| 1011 |
|
|
blknr += nr_used;
|
| 1012 |
|
|
n = nr_used;
|
| 1013 |
|
|
while (blknr < last_blknr) {
|
| 1014 |
|
|
bhs[n] = sb_getblk(sb, blknr);
|
| 1015 |
|
|
if (!bhs[n]) {
|
| 1016 |
|
|
err = -ENOMEM;
|
| 1017 |
|
|
goto error;
|
| 1018 |
|
|
}
|
| 1019 |
|
|
memset(bhs[n]->b_data, 0, sb->s_blocksize);
|
| 1020 |
|
|
set_buffer_uptodate(bhs[n]);
|
| 1021 |
|
|
mark_buffer_dirty(bhs[n]);
|
| 1022 |
|
|
|
| 1023 |
|
|
n++;
|
| 1024 |
|
|
blknr++;
|
| 1025 |
|
|
if (n == nr_bhs) {
|
| 1026 |
|
|
if (IS_DIRSYNC(dir)) {
|
| 1027 |
|
|
err = fat_sync_bhs(bhs, n);
|
| 1028 |
|
|
if (err)
|
| 1029 |
|
|
goto error;
|
| 1030 |
|
|
}
|
| 1031 |
|
|
for (i = 0; i < n; i++)
|
| 1032 |
|
|
brelse(bhs[i]);
|
| 1033 |
|
|
n = 0;
|
| 1034 |
|
|
}
|
| 1035 |
|
|
}
|
| 1036 |
|
|
if (IS_DIRSYNC(dir)) {
|
| 1037 |
|
|
err = fat_sync_bhs(bhs, n);
|
| 1038 |
|
|
if (err)
|
| 1039 |
|
|
goto error;
|
| 1040 |
|
|
}
|
| 1041 |
|
|
for (i = 0; i < n; i++)
|
| 1042 |
|
|
brelse(bhs[i]);
|
| 1043 |
|
|
|
| 1044 |
|
|
return 0;
|
| 1045 |
|
|
|
| 1046 |
|
|
error:
|
| 1047 |
|
|
for (i = 0; i < n; i++)
|
| 1048 |
|
|
bforget(bhs[i]);
|
| 1049 |
|
|
return err;
|
| 1050 |
|
|
}
|
| 1051 |
|
|
|
| 1052 |
|
|
int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
|
| 1053 |
|
|
{
|
| 1054 |
|
|
struct super_block *sb = dir->i_sb;
|
| 1055 |
|
|
struct msdos_sb_info *sbi = MSDOS_SB(sb);
|
| 1056 |
|
|
struct buffer_head *bhs[MAX_BUF_PER_PAGE];
|
| 1057 |
|
|
struct msdos_dir_entry *de;
|
| 1058 |
|
|
sector_t blknr;
|
| 1059 |
|
|
__le16 date, time;
|
| 1060 |
|
|
int err, cluster;
|
| 1061 |
|
|
|
| 1062 |
|
|
err = fat_alloc_clusters(dir, &cluster, 1);
|
| 1063 |
|
|
if (err)
|
| 1064 |
|
|
goto error;
|
| 1065 |
|
|
|
| 1066 |
|
|
blknr = fat_clus_to_blknr(sbi, cluster);
|
| 1067 |
|
|
bhs[0] = sb_getblk(sb, blknr);
|
| 1068 |
|
|
if (!bhs[0]) {
|
| 1069 |
|
|
err = -ENOMEM;
|
| 1070 |
|
|
goto error_free;
|
| 1071 |
|
|
}
|
| 1072 |
|
|
|
| 1073 |
|
|
fat_date_unix2dos(ts->tv_sec, &time, &date);
|
| 1074 |
|
|
|
| 1075 |
|
|
de = (struct msdos_dir_entry *)bhs[0]->b_data;
|
| 1076 |
|
|
/* filling the new directory slots ("." and ".." entries) */
|
| 1077 |
|
|
memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME);
|
| 1078 |
|
|
memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME);
|
| 1079 |
|
|
de->attr = de[1].attr = ATTR_DIR;
|
| 1080 |
|
|
de[0].lcase = de[1].lcase = 0;
|
| 1081 |
|
|
de[0].time = de[1].time = time;
|
| 1082 |
|
|
de[0].date = de[1].date = date;
|
| 1083 |
|
|
de[0].ctime_cs = de[1].ctime_cs = 0;
|
| 1084 |
|
|
if (sbi->options.isvfat) {
|
| 1085 |
|
|
/* extra timestamps */
|
| 1086 |
|
|
de[0].ctime = de[1].ctime = time;
|
| 1087 |
|
|
de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date;
|
| 1088 |
|
|
} else {
|
| 1089 |
|
|
de[0].ctime = de[1].ctime = 0;
|
| 1090 |
|
|
de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0;
|
| 1091 |
|
|
}
|
| 1092 |
|
|
de[0].start = cpu_to_le16(cluster);
|
| 1093 |
|
|
de[0].starthi = cpu_to_le16(cluster >> 16);
|
| 1094 |
|
|
de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart);
|
| 1095 |
|
|
de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16);
|
| 1096 |
|
|
de[0].size = de[1].size = 0;
|
| 1097 |
|
|
memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de));
|
| 1098 |
|
|
set_buffer_uptodate(bhs[0]);
|
| 1099 |
|
|
mark_buffer_dirty(bhs[0]);
|
| 1100 |
|
|
|
| 1101 |
|
|
err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE);
|
| 1102 |
|
|
if (err)
|
| 1103 |
|
|
goto error_free;
|
| 1104 |
|
|
|
| 1105 |
|
|
return cluster;
|
| 1106 |
|
|
|
| 1107 |
|
|
error_free:
|
| 1108 |
|
|
fat_free_clusters(dir, cluster);
|
| 1109 |
|
|
error:
|
| 1110 |
|
|
return err;
|
| 1111 |
|
|
}
|
| 1112 |
|
|
|
| 1113 |
|
|
EXPORT_SYMBOL_GPL(fat_alloc_new_dir);
|
| 1114 |
|
|
|
| 1115 |
|
|
static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
|
| 1116 |
|
|
int *nr_cluster, struct msdos_dir_entry **de,
|
| 1117 |
|
|
struct buffer_head **bh, loff_t *i_pos)
|
| 1118 |
|
|
{
|
| 1119 |
|
|
struct super_block *sb = dir->i_sb;
|
| 1120 |
|
|
struct msdos_sb_info *sbi = MSDOS_SB(sb);
|
| 1121 |
|
|
struct buffer_head *bhs[MAX_BUF_PER_PAGE];
|
| 1122 |
|
|
sector_t blknr, start_blknr, last_blknr;
|
| 1123 |
|
|
unsigned long size, copy;
|
| 1124 |
|
|
int err, i, n, offset, cluster[2];
|
| 1125 |
|
|
|
| 1126 |
|
|
/*
|
| 1127 |
|
|
* The minimum cluster size is 512bytes, and maximum entry
|
| 1128 |
|
|
* size is 32*slots (672bytes). So, iff the cluster size is
|
| 1129 |
|
|
* 512bytes, we may need two clusters.
|
| 1130 |
|
|
*/
|
| 1131 |
|
|
size = nr_slots * sizeof(struct msdos_dir_entry);
|
| 1132 |
|
|
*nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits;
|
| 1133 |
|
|
BUG_ON(*nr_cluster > 2);
|
| 1134 |
|
|
|
| 1135 |
|
|
err = fat_alloc_clusters(dir, cluster, *nr_cluster);
|
| 1136 |
|
|
if (err)
|
| 1137 |
|
|
goto error;
|
| 1138 |
|
|
|
| 1139 |
|
|
/*
|
| 1140 |
|
|
* First stage: Fill the directory entry. NOTE: This cluster
|
| 1141 |
|
|
* is not referenced from any inode yet, so updates order is
|
| 1142 |
|
|
* not important.
|
| 1143 |
|
|
*/
|
| 1144 |
|
|
i = n = copy = 0;
|
| 1145 |
|
|
do {
|
| 1146 |
|
|
start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]);
|
| 1147 |
|
|
last_blknr = start_blknr + sbi->sec_per_clus;
|
| 1148 |
|
|
while (blknr < last_blknr) {
|
| 1149 |
|
|
bhs[n] = sb_getblk(sb, blknr);
|
| 1150 |
|
|
if (!bhs[n]) {
|
| 1151 |
|
|
err = -ENOMEM;
|
| 1152 |
|
|
goto error_nomem;
|
| 1153 |
|
|
}
|
| 1154 |
|
|
|
| 1155 |
|
|
/* fill the directory entry */
|
| 1156 |
|
|
copy = min(size, sb->s_blocksize);
|
| 1157 |
|
|
memcpy(bhs[n]->b_data, slots, copy);
|
| 1158 |
|
|
slots += copy;
|
| 1159 |
|
|
size -= copy;
|
| 1160 |
|
|
set_buffer_uptodate(bhs[n]);
|
| 1161 |
|
|
mark_buffer_dirty(bhs[n]);
|
| 1162 |
|
|
if (!size)
|
| 1163 |
|
|
break;
|
| 1164 |
|
|
n++;
|
| 1165 |
|
|
blknr++;
|
| 1166 |
|
|
}
|
| 1167 |
|
|
} while (++i < *nr_cluster);
|
| 1168 |
|
|
|
| 1169 |
|
|
memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy);
|
| 1170 |
|
|
offset = copy - sizeof(struct msdos_dir_entry);
|
| 1171 |
|
|
get_bh(bhs[n]);
|
| 1172 |
|
|
*bh = bhs[n];
|
| 1173 |
|
|
*de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
|
| 1174 |
|
|
*i_pos = fat_make_i_pos(sb, *bh, *de);
|
| 1175 |
|
|
|
| 1176 |
|
|
/* Second stage: clear the rest of cluster, and write outs */
|
| 1177 |
|
|
err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE);
|
| 1178 |
|
|
if (err)
|
| 1179 |
|
|
goto error_free;
|
| 1180 |
|
|
|
| 1181 |
|
|
return cluster[0];
|
| 1182 |
|
|
|
| 1183 |
|
|
error_free:
|
| 1184 |
|
|
brelse(*bh);
|
| 1185 |
|
|
*bh = NULL;
|
| 1186 |
|
|
n = 0;
|
| 1187 |
|
|
error_nomem:
|
| 1188 |
|
|
for (i = 0; i < n; i++)
|
| 1189 |
|
|
bforget(bhs[i]);
|
| 1190 |
|
|
fat_free_clusters(dir, cluster[0]);
|
| 1191 |
|
|
error:
|
| 1192 |
|
|
return err;
|
| 1193 |
|
|
}
|
| 1194 |
|
|
|
| 1195 |
|
|
int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
|
| 1196 |
|
|
struct fat_slot_info *sinfo)
|
| 1197 |
|
|
{
|
| 1198 |
|
|
struct super_block *sb = dir->i_sb;
|
| 1199 |
|
|
struct msdos_sb_info *sbi = MSDOS_SB(sb);
|
| 1200 |
|
|
struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */
|
| 1201 |
|
|
struct msdos_dir_entry *de;
|
| 1202 |
|
|
int err, free_slots, i, nr_bhs;
|
| 1203 |
|
|
loff_t pos, i_pos;
|
| 1204 |
|
|
|
| 1205 |
|
|
sinfo->nr_slots = nr_slots;
|
| 1206 |
|
|
|
| 1207 |
|
|
/* First stage: search free direcotry entries */
|
| 1208 |
|
|
free_slots = nr_bhs = 0;
|
| 1209 |
|
|
bh = prev = NULL;
|
| 1210 |
|
|
pos = 0;
|
| 1211 |
|
|
err = -ENOSPC;
|
| 1212 |
|
|
while (fat_get_entry(dir, &pos, &bh, &de) > -1) {
|
| 1213 |
|
|
/* check the maximum size of directory */
|
| 1214 |
|
|
if (pos >= FAT_MAX_DIR_SIZE)
|
| 1215 |
|
|
goto error;
|
| 1216 |
|
|
|
| 1217 |
|
|
if (IS_FREE(de->name)) {
|
| 1218 |
|
|
if (prev != bh) {
|
| 1219 |
|
|
get_bh(bh);
|
| 1220 |
|
|
bhs[nr_bhs] = prev = bh;
|
| 1221 |
|
|
nr_bhs++;
|
| 1222 |
|
|
}
|
| 1223 |
|
|
free_slots++;
|
| 1224 |
|
|
if (free_slots == nr_slots)
|
| 1225 |
|
|
goto found;
|
| 1226 |
|
|
} else {
|
| 1227 |
|
|
for (i = 0; i < nr_bhs; i++)
|
| 1228 |
|
|
brelse(bhs[i]);
|
| 1229 |
|
|
prev = NULL;
|
| 1230 |
|
|
free_slots = nr_bhs = 0;
|
| 1231 |
|
|
}
|
| 1232 |
|
|
}
|
| 1233 |
|
|
if (dir->i_ino == MSDOS_ROOT_INO) {
|
| 1234 |
|
|
if (sbi->fat_bits != 32)
|
| 1235 |
|
|
goto error;
|
| 1236 |
|
|
} else if (MSDOS_I(dir)->i_start == 0) {
|
| 1237 |
|
|
printk(KERN_ERR "FAT: Corrupted directory (i_pos %lld)\n",
|
| 1238 |
|
|
MSDOS_I(dir)->i_pos);
|
| 1239 |
|
|
err = -EIO;
|
| 1240 |
|
|
goto error;
|
| 1241 |
|
|
}
|
| 1242 |
|
|
|
| 1243 |
|
|
found:
|
| 1244 |
|
|
err = 0;
|
| 1245 |
|
|
pos -= free_slots * sizeof(*de);
|
| 1246 |
|
|
nr_slots -= free_slots;
|
| 1247 |
|
|
if (free_slots) {
|
| 1248 |
|
|
/*
|
| 1249 |
|
|
* Second stage: filling the free entries with new entries.
|
| 1250 |
|
|
* NOTE: If this slots has shortname, first, we write
|
| 1251 |
|
|
* the long name slots, then write the short name.
|
| 1252 |
|
|
*/
|
| 1253 |
|
|
int size = free_slots * sizeof(*de);
|
| 1254 |
|
|
int offset = pos & (sb->s_blocksize - 1);
|
| 1255 |
|
|
int long_bhs = nr_bhs - (nr_slots == 0);
|
| 1256 |
|
|
|
| 1257 |
|
|
/* Fill the long name slots. */
|
| 1258 |
|
|
for (i = 0; i < long_bhs; i++) {
|
| 1259 |
|
|
int copy = min_t(int, sb->s_blocksize - offset, size);
|
| 1260 |
|
|
memcpy(bhs[i]->b_data + offset, slots, copy);
|
| 1261 |
|
|
mark_buffer_dirty(bhs[i]);
|
| 1262 |
|
|
offset = 0;
|
| 1263 |
|
|
slots += copy;
|
| 1264 |
|
|
size -= copy;
|
| 1265 |
|
|
}
|
| 1266 |
|
|
if (long_bhs && IS_DIRSYNC(dir))
|
| 1267 |
|
|
err = fat_sync_bhs(bhs, long_bhs);
|
| 1268 |
|
|
if (!err && i < nr_bhs) {
|
| 1269 |
|
|
/* Fill the short name slot. */
|
| 1270 |
|
|
int copy = min_t(int, sb->s_blocksize - offset, size);
|
| 1271 |
|
|
memcpy(bhs[i]->b_data + offset, slots, copy);
|
| 1272 |
|
|
mark_buffer_dirty(bhs[i]);
|
| 1273 |
|
|
if (IS_DIRSYNC(dir))
|
| 1274 |
|
|
err = sync_dirty_buffer(bhs[i]);
|
| 1275 |
|
|
}
|
| 1276 |
|
|
for (i = 0; i < nr_bhs; i++)
|
| 1277 |
|
|
brelse(bhs[i]);
|
| 1278 |
|
|
if (err)
|
| 1279 |
|
|
goto error_remove;
|
| 1280 |
|
|
}
|
| 1281 |
|
|
|
| 1282 |
|
|
if (nr_slots) {
|
| 1283 |
|
|
int cluster, nr_cluster;
|
| 1284 |
|
|
|
| 1285 |
|
|
/*
|
| 1286 |
|
|
* Third stage: allocate the cluster for new entries.
|
| 1287 |
|
|
* And initialize the cluster with new entries, then
|
| 1288 |
|
|
* add the cluster to dir.
|
| 1289 |
|
|
*/
|
| 1290 |
|
|
cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster,
|
| 1291 |
|
|
&de, &bh, &i_pos);
|
| 1292 |
|
|
if (cluster < 0) {
|
| 1293 |
|
|
err = cluster;
|
| 1294 |
|
|
goto error_remove;
|
| 1295 |
|
|
}
|
| 1296 |
|
|
err = fat_chain_add(dir, cluster, nr_cluster);
|
| 1297 |
|
|
if (err) {
|
| 1298 |
|
|
fat_free_clusters(dir, cluster);
|
| 1299 |
|
|
goto error_remove;
|
| 1300 |
|
|
}
|
| 1301 |
|
|
if (dir->i_size & (sbi->cluster_size - 1)) {
|
| 1302 |
|
|
fat_fs_panic(sb, "Odd directory size");
|
| 1303 |
|
|
dir->i_size = (dir->i_size + sbi->cluster_size - 1)
|
| 1304 |
|
|
& ~((loff_t)sbi->cluster_size - 1);
|
| 1305 |
|
|
}
|
| 1306 |
|
|
dir->i_size += nr_cluster << sbi->cluster_bits;
|
| 1307 |
|
|
MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits;
|
| 1308 |
|
|
}
|
| 1309 |
|
|
sinfo->slot_off = pos;
|
| 1310 |
|
|
sinfo->de = de;
|
| 1311 |
|
|
sinfo->bh = bh;
|
| 1312 |
|
|
sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
|
| 1313 |
|
|
|
| 1314 |
|
|
return 0;
|
| 1315 |
|
|
|
| 1316 |
|
|
error:
|
| 1317 |
|
|
brelse(bh);
|
| 1318 |
|
|
for (i = 0; i < nr_bhs; i++)
|
| 1319 |
|
|
brelse(bhs[i]);
|
| 1320 |
|
|
return err;
|
| 1321 |
|
|
|
| 1322 |
|
|
error_remove:
|
| 1323 |
|
|
brelse(bh);
|
| 1324 |
|
|
if (free_slots)
|
| 1325 |
|
|
__fat_remove_entries(dir, pos, free_slots);
|
| 1326 |
|
|
return err;
|
| 1327 |
|
|
}
|
| 1328 |
|
|
|
| 1329 |
|
|
EXPORT_SYMBOL_GPL(fat_add_entries);
|
