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/smp_lock.h> |
34 | #include <linux/buffer_head.h> |
35 | |
36 | #include "udf_i.h" |
37 | #include "udf_sb.h" |
38 | |
39 | static int do_udf_readdir(struct inode *dir, struct file *filp, |
40 | filldir_t filldir, void *dirent) |
41 | { |
42 | struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL}; |
43 | struct fileIdentDesc *fi = NULL; |
44 | struct fileIdentDesc cfi; |
45 | int block, iblock; |
46 | loff_t nf_pos = (filp->f_pos - 1) << 2; |
47 | int flen; |
48 | char *fname = NULL; |
49 | char *nameptr; |
50 | uint16_t liu; |
51 | uint8_t lfi; |
52 | loff_t size = udf_ext0_offset(dir) + dir->i_size; |
53 | struct buffer_head *tmp, *bha[16]; |
54 | struct kernel_lb_addr eloc; |
55 | uint32_t elen; |
56 | sector_t offset; |
57 | int i, num, ret = 0; |
58 | unsigned int dt_type; |
59 | struct extent_position epos = { NULL, 0, {0, 0} }; |
60 | struct udf_inode_info *iinfo; |
61 | |
62 | if (nf_pos >= size) |
63 | goto out; |
64 | |
65 | fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); |
66 | if (!fname) { |
67 | ret = -ENOMEM; |
68 | goto out; |
69 | } |
70 | |
71 | if (nf_pos == 0) |
72 | nf_pos = udf_ext0_offset(dir); |
73 | |
74 | fibh.soffset = fibh.eoffset = nf_pos & (dir->i_sb->s_blocksize - 1); |
75 | iinfo = UDF_I(dir); |
76 | if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
77 | if (inode_bmap(dir, nf_pos >> dir->i_sb->s_blocksize_bits, |
78 | &epos, &eloc, &elen, &offset) |
79 | != (EXT_RECORDED_ALLOCATED >> 30)) { |
80 | ret = -ENOENT; |
81 | goto out; |
82 | } |
83 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); |
84 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
85 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
86 | epos.offset -= sizeof(struct short_ad); |
87 | else if (iinfo->i_alloc_type == |
88 | ICBTAG_FLAG_AD_LONG) |
89 | epos.offset -= sizeof(struct long_ad); |
90 | } else { |
91 | offset = 0; |
92 | } |
93 | |
94 | if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) { |
95 | ret = -EIO; |
96 | goto out; |
97 | } |
98 | |
99 | if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) { |
100 | i = 16 >> (dir->i_sb->s_blocksize_bits - 9); |
101 | if (i + offset > (elen >> dir->i_sb->s_blocksize_bits)) |
102 | i = (elen >> dir->i_sb->s_blocksize_bits) - offset; |
103 | for (num = 0; i > 0; i--) { |
104 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset + i); |
105 | tmp = udf_tgetblk(dir->i_sb, block); |
106 | if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp)) |
107 | bha[num++] = tmp; |
108 | else |
109 | brelse(tmp); |
110 | } |
111 | if (num) { |
112 | ll_rw_block(READA, num, bha); |
113 | for (i = 0; i < num; i++) |
114 | brelse(bha[i]); |
115 | } |
116 | } |
117 | } |
118 | |
119 | while (nf_pos < size) { |
120 | filp->f_pos = (nf_pos >> 2) + 1; |
121 | |
122 | fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc, |
123 | &elen, &offset); |
124 | if (!fi) |
125 | goto out; |
126 | |
127 | liu = le16_to_cpu(cfi.lengthOfImpUse); |
128 | lfi = cfi.lengthFileIdent; |
129 | |
130 | if (fibh.sbh == fibh.ebh) { |
131 | nameptr = fi->fileIdent + liu; |
132 | } else { |
133 | int poffset; /* Unpaded ending offset */ |
134 | |
135 | poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi; |
136 | |
137 | if (poffset >= lfi) { |
138 | nameptr = (char *)(fibh.ebh->b_data + poffset - lfi); |
139 | } else { |
140 | nameptr = fname; |
141 | memcpy(nameptr, fi->fileIdent + liu, |
142 | lfi - poffset); |
143 | memcpy(nameptr + lfi - poffset, |
144 | fibh.ebh->b_data, poffset); |
145 | } |
146 | } |
147 | |
148 | if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { |
149 | if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE)) |
150 | continue; |
151 | } |
152 | |
153 | if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { |
154 | if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE)) |
155 | continue; |
156 | } |
157 | |
158 | if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) { |
159 | iblock = parent_ino(filp->f_path.dentry); |
160 | flen = 2; |
161 | memcpy(fname, "..", flen); |
162 | dt_type = DT_DIR; |
163 | } else { |
164 | struct kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation); |
165 | |
166 | iblock = udf_get_lb_pblock(dir->i_sb, &tloc, 0); |
167 | flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi); |
168 | dt_type = DT_UNKNOWN; |
169 | } |
170 | |
171 | if (flen && filldir(dirent, fname, flen, filp->f_pos, |
172 | iblock, dt_type) < 0) |
173 | goto out; |
174 | } /* end while */ |
175 | |
176 | filp->f_pos = (nf_pos >> 2) + 1; |
177 | |
178 | out: |
179 | if (fibh.sbh != fibh.ebh) |
180 | brelse(fibh.ebh); |
181 | brelse(fibh.sbh); |
182 | brelse(epos.bh); |
183 | kfree(fname); |
184 | |
185 | return ret; |
186 | } |
187 | |
188 | static int udf_readdir(struct file *filp, void *dirent, filldir_t filldir) |
189 | { |
190 | struct inode *dir = filp->f_path.dentry->d_inode; |
191 | int result; |
192 | |
193 | lock_kernel(); |
194 | |
195 | if (filp->f_pos == 0) { |
196 | if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0) { |
197 | unlock_kernel(); |
198 | return 0; |
199 | } |
200 | filp->f_pos++; |
201 | } |
202 | |
203 | result = do_udf_readdir(dir, filp, filldir, dirent); |
204 | unlock_kernel(); |
205 | return result; |
206 | } |
207 | |
208 | /* readdir and lookup functions */ |
209 | const struct file_operations udf_dir_operations = { |
210 | .read = generic_read_dir, |
211 | .readdir = udf_readdir, |
212 | .ioctl = udf_ioctl, |
213 | .fsync = simple_fsync, |
214 | }; |
215 |
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