Root/
1 | /* |
2 | * dir.c |
3 | * |
4 | * PURPOSE |
5 | * Directory handling routines for the OSTA-UDF(tm) filesystem. |
6 | * |
7 | * COPYRIGHT |
8 | * This file is distributed under the terms of the GNU General Public |
9 | * License (GPL). Copies of the GPL can be obtained from: |
10 | * ftp://prep.ai.mit.edu/pub/gnu/GPL |
11 | * Each contributing author retains all rights to their own work. |
12 | * |
13 | * (C) 1998-2004 Ben Fennema |
14 | * |
15 | * HISTORY |
16 | * |
17 | * 10/05/98 dgb Split directory operations into its own file |
18 | * Implemented directory reads via do_udf_readdir |
19 | * 10/06/98 Made directory operations work! |
20 | * 11/17/98 Rewrote directory to support ICBTAG_FLAG_AD_LONG |
21 | * 11/25/98 blf Rewrote directory handling (readdir+lookup) to support reading |
22 | * across blocks. |
23 | * 12/12/98 Split out the lookup code to namei.c. bulk of directory |
24 | * code now in directory.c:udf_fileident_read. |
25 | */ |
26 | |
27 | #include "udfdecl.h" |
28 | |
29 | #include <linux/string.h> |
30 | #include <linux/errno.h> |
31 | #include <linux/mm.h> |
32 | #include <linux/slab.h> |
33 | #include <linux/buffer_head.h> |
34 | |
35 | #include "udf_i.h" |
36 | #include "udf_sb.h" |
37 | |
38 | static int do_udf_readdir(struct inode *dir, struct file *filp, |
39 | filldir_t filldir, void *dirent) |
40 | { |
41 | struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL}; |
42 | struct fileIdentDesc *fi = NULL; |
43 | struct fileIdentDesc cfi; |
44 | int block, iblock; |
45 | loff_t nf_pos = (filp->f_pos - 1) << 2; |
46 | int flen; |
47 | unsigned char *fname = NULL; |
48 | unsigned char *nameptr; |
49 | uint16_t liu; |
50 | uint8_t lfi; |
51 | loff_t size = udf_ext0_offset(dir) + dir->i_size; |
52 | struct buffer_head *tmp, *bha[16]; |
53 | struct kernel_lb_addr eloc; |
54 | uint32_t elen; |
55 | sector_t offset; |
56 | int i, num, ret = 0; |
57 | unsigned int dt_type; |
58 | struct extent_position epos = { NULL, 0, {0, 0} }; |
59 | struct udf_inode_info *iinfo; |
60 | |
61 | if (nf_pos >= size) |
62 | goto out; |
63 | |
64 | fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); |
65 | if (!fname) { |
66 | ret = -ENOMEM; |
67 | goto out; |
68 | } |
69 | |
70 | if (nf_pos == 0) |
71 | nf_pos = udf_ext0_offset(dir); |
72 | |
73 | fibh.soffset = fibh.eoffset = nf_pos & (dir->i_sb->s_blocksize - 1); |
74 | iinfo = UDF_I(dir); |
75 | if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
76 | if (inode_bmap(dir, nf_pos >> dir->i_sb->s_blocksize_bits, |
77 | &epos, &eloc, &elen, &offset) |
78 | != (EXT_RECORDED_ALLOCATED >> 30)) { |
79 | ret = -ENOENT; |
80 | goto out; |
81 | } |
82 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); |
83 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
84 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
85 | epos.offset -= sizeof(struct short_ad); |
86 | else if (iinfo->i_alloc_type == |
87 | ICBTAG_FLAG_AD_LONG) |
88 | epos.offset -= sizeof(struct long_ad); |
89 | } else { |
90 | offset = 0; |
91 | } |
92 | |
93 | if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) { |
94 | ret = -EIO; |
95 | goto out; |
96 | } |
97 | |
98 | if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) { |
99 | i = 16 >> (dir->i_sb->s_blocksize_bits - 9); |
100 | if (i + offset > (elen >> dir->i_sb->s_blocksize_bits)) |
101 | i = (elen >> dir->i_sb->s_blocksize_bits) - offset; |
102 | for (num = 0; i > 0; i--) { |
103 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset + i); |
104 | tmp = udf_tgetblk(dir->i_sb, block); |
105 | if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp)) |
106 | bha[num++] = tmp; |
107 | else |
108 | brelse(tmp); |
109 | } |
110 | if (num) { |
111 | ll_rw_block(READA, num, bha); |
112 | for (i = 0; i < num; i++) |
113 | brelse(bha[i]); |
114 | } |
115 | } |
116 | } |
117 | |
118 | while (nf_pos < size) { |
119 | filp->f_pos = (nf_pos >> 2) + 1; |
120 | |
121 | fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc, |
122 | &elen, &offset); |
123 | if (!fi) |
124 | goto out; |
125 | |
126 | liu = le16_to_cpu(cfi.lengthOfImpUse); |
127 | lfi = cfi.lengthFileIdent; |
128 | |
129 | if (fibh.sbh == fibh.ebh) { |
130 | nameptr = fi->fileIdent + liu; |
131 | } else { |
132 | int poffset; /* Unpaded ending offset */ |
133 | |
134 | poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi; |
135 | |
136 | if (poffset >= lfi) { |
137 | nameptr = (char *)(fibh.ebh->b_data + poffset - lfi); |
138 | } else { |
139 | nameptr = fname; |
140 | memcpy(nameptr, fi->fileIdent + liu, |
141 | lfi - poffset); |
142 | memcpy(nameptr + lfi - poffset, |
143 | fibh.ebh->b_data, poffset); |
144 | } |
145 | } |
146 | |
147 | if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { |
148 | if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE)) |
149 | continue; |
150 | } |
151 | |
152 | if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { |
153 | if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE)) |
154 | continue; |
155 | } |
156 | |
157 | if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) { |
158 | iblock = parent_ino(filp->f_path.dentry); |
159 | flen = 2; |
160 | memcpy(fname, "..", flen); |
161 | dt_type = DT_DIR; |
162 | } else { |
163 | struct kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation); |
164 | |
165 | iblock = udf_get_lb_pblock(dir->i_sb, &tloc, 0); |
166 | flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi); |
167 | dt_type = DT_UNKNOWN; |
168 | } |
169 | |
170 | if (flen && filldir(dirent, fname, flen, filp->f_pos, |
171 | iblock, dt_type) < 0) |
172 | goto out; |
173 | } /* end while */ |
174 | |
175 | filp->f_pos = (nf_pos >> 2) + 1; |
176 | |
177 | out: |
178 | if (fibh.sbh != fibh.ebh) |
179 | brelse(fibh.ebh); |
180 | brelse(fibh.sbh); |
181 | brelse(epos.bh); |
182 | kfree(fname); |
183 | |
184 | return ret; |
185 | } |
186 | |
187 | static int udf_readdir(struct file *filp, void *dirent, filldir_t filldir) |
188 | { |
189 | struct inode *dir = filp->f_path.dentry->d_inode; |
190 | int result; |
191 | |
192 | if (filp->f_pos == 0) { |
193 | if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0) { |
194 | return 0; |
195 | } |
196 | filp->f_pos++; |
197 | } |
198 | |
199 | result = do_udf_readdir(dir, filp, filldir, dirent); |
200 | return result; |
201 | } |
202 | |
203 | /* readdir and lookup functions */ |
204 | const struct file_operations udf_dir_operations = { |
205 | .llseek = generic_file_llseek, |
206 | .read = generic_read_dir, |
207 | .readdir = udf_readdir, |
208 | .unlocked_ioctl = udf_ioctl, |
209 | .fsync = generic_file_fsync, |
210 | }; |
211 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9