5 * Directory handling routines for the OSTA-UDF(tm) filesystem.
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.
13 * (C) 1998-2004 Ben Fennema
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
23 * 12/12/98 Split out the lookup code to namei.c. bulk of directory
24 * code now in directory.c:udf_fileident_read.
29 #include <linux/string.h>
30 #include <linux/errno.h>
32 #include <linux/slab.h>
33 #include <linux/smp_lock.h>
34 #include <linux/buffer_head.h>
39 /* Prototypes for file operations */
40 static int udf_readdir(struct file *, void *, filldir_t);
41 static int do_udf_readdir(struct inode *, struct file *, filldir_t, void *);
43 /* readdir and lookup functions */
45 const struct file_operations udf_dir_operations = {
46 .read = generic_read_dir,
47 .readdir = udf_readdir,
49 .fsync = udf_fsync_file,
56 * Read a directory entry.
59 * Optional - sys_getdents() will return -ENOTDIR if this routine is not
62 * Refer to sys_getdents() in fs/readdir.c
66 * filp Pointer to directory file.
67 * buf Pointer to directory entry buffer.
68 * filldir Pointer to filldir function.
71 * <return> >=0 on success.
74 * July 1, 1997 - Andrew E. Mileski
75 * Written, tested, and released.
78 int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
80 struct inode *dir = filp->f_path.dentry->d_inode;
85 if (filp->f_pos == 0) {
86 if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) <
94 result = do_udf_readdir(dir, filp, filldir, dirent);
100 do_udf_readdir(struct inode *dir, struct file *filp, filldir_t filldir,
103 struct udf_fileident_bh fibh;
104 struct fileIdentDesc *fi = NULL;
105 struct fileIdentDesc cfi;
107 loff_t nf_pos = filp->f_pos - 1;
109 char fname[UDF_NAME_LEN];
113 loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
114 struct buffer_head *tmp, *bha[16];
119 unsigned int dt_type;
120 struct extent_position epos = { NULL, 0, {0, 0} };
126 nf_pos = (udf_ext0_offset(dir) >> 2);
128 fibh.soffset = fibh.eoffset =
129 (nf_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
130 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
131 fibh.sbh = fibh.ebh = NULL;
132 else if (inode_bmap(dir, nf_pos >> (dir->i_sb->s_blocksize_bits - 2),
134 &offset) == (EXT_RECORDED_ALLOCATED >> 30)) {
135 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
136 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
137 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
138 epos.offset -= sizeof(short_ad);
139 else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
140 epos.offset -= sizeof(long_ad);
144 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
149 if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) {
150 i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
151 if (i + offset > (elen >> dir->i_sb->s_blocksize_bits))
152 i = (elen >> dir->i_sb->s_blocksize_bits) -
154 for (num = 0; i > 0; i--) {
156 udf_get_lb_pblock(dir->i_sb, eloc,
158 tmp = udf_tgetblk(dir->i_sb, block);
159 if (tmp && !buffer_uptodate(tmp)
160 && !buffer_locked(tmp))
166 ll_rw_block(READA, num, bha);
167 for (i = 0; i < num; i++)
176 while (nf_pos < size) {
177 filp->f_pos = nf_pos + 1;
179 fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
183 if (fibh.sbh != fibh.ebh)
190 liu = le16_to_cpu(cfi.lengthOfImpUse);
191 lfi = cfi.lengthFileIdent;
193 if (fibh.sbh == fibh.ebh)
194 nameptr = fi->fileIdent + liu;
196 int poffset; /* Unpaded ending offset */
199 fibh.soffset + sizeof(struct fileIdentDesc) + liu +
204 (char *)(fibh.ebh->b_data + poffset - lfi);
207 memcpy(nameptr, fi->fileIdent + liu,
209 memcpy(nameptr + lfi - poffset,
210 fibh.ebh->b_data, poffset);
214 if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
215 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
219 if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
220 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
224 if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
225 iblock = parent_ino(filp->f_path.dentry);
227 memcpy(fname, "..", flen);
230 kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
232 iblock = udf_get_lb_pblock(dir->i_sb, tloc, 0);
233 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
234 dt_type = DT_UNKNOWN;
239 (dirent, fname, flen, filp->f_pos, iblock,
241 if (fibh.sbh != fibh.ebh)
250 filp->f_pos = nf_pos + 1;
252 if (fibh.sbh != fibh.ebh)