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-rw-r--r--fs/udf/dir.c268
1 files changed, 268 insertions, 0 deletions
diff --git a/fs/udf/dir.c b/fs/udf/dir.c
new file mode 100644
index 000000000000..82440b731142
--- /dev/null
+++ b/fs/udf/dir.c
@@ -0,0 +1,268 @@
+/*
+ * dir.c
+ *
+ * PURPOSE
+ * Directory handling routines for the OSTA-UDF(tm) filesystem.
+ *
+ * CONTACTS
+ * E-mail regarding any portion of the Linux UDF file system should be
+ * directed to the development team mailing list (run by majordomo):
+ * linux_udf@hpesjro.fc.hp.com
+ *
+ * COPYRIGHT
+ * This file is distributed under the terms of the GNU General Public
+ * License (GPL). Copies of the GPL can be obtained from:
+ * ftp://prep.ai.mit.edu/pub/gnu/GPL
+ * Each contributing author retains all rights to their own work.
+ *
+ * (C) 1998-2004 Ben Fennema
+ *
+ * HISTORY
+ *
+ * 10/05/98 dgb Split directory operations into its own file
+ * Implemented directory reads via do_udf_readdir
+ * 10/06/98 Made directory operations work!
+ * 11/17/98 Rewrote directory to support ICBTAG_FLAG_AD_LONG
+ * 11/25/98 blf Rewrote directory handling (readdir+lookup) to support reading
+ * across blocks.
+ * 12/12/98 Split out the lookup code to namei.c. bulk of directory
+ * code now in directory.c:udf_fileident_read.
+ */
+
+#include "udfdecl.h"
+
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+
+#include "udf_i.h"
+#include "udf_sb.h"
+
+/* Prototypes for file operations */
+static int udf_readdir(struct file *, void *, filldir_t);
+static int do_udf_readdir(struct inode *, struct file *, filldir_t, void *);
+
+/* readdir and lookup functions */
+
+struct file_operations udf_dir_operations = {
+ .read = generic_read_dir,
+ .readdir = udf_readdir,
+ .ioctl = udf_ioctl,
+ .fsync = udf_fsync_file,
+};
+
+/*
+ * udf_readdir
+ *
+ * PURPOSE
+ * Read a directory entry.
+ *
+ * DESCRIPTION
+ * Optional - sys_getdents() will return -ENOTDIR if this routine is not
+ * available.
+ *
+ * Refer to sys_getdents() in fs/readdir.c
+ * sys_getdents() -> .
+ *
+ * PRE-CONDITIONS
+ * filp Pointer to directory file.
+ * buf Pointer to directory entry buffer.
+ * filldir Pointer to filldir function.
+ *
+ * POST-CONDITIONS
+ * <return> >=0 on success.
+ *
+ * HISTORY
+ * July 1, 1997 - Andrew E. Mileski
+ * Written, tested, and released.
+ */
+
+int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+ struct inode *dir = filp->f_dentry->d_inode;
+ int result;
+
+ lock_kernel();
+
+ if ( filp->f_pos == 0 )
+ {
+ if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0)
+ {
+ unlock_kernel();
+ return 0;
+ }
+ filp->f_pos ++;
+ }
+
+ result = do_udf_readdir(dir, filp, filldir, dirent);
+ unlock_kernel();
+ return result;
+}
+
+static int
+do_udf_readdir(struct inode * dir, struct file *filp, filldir_t filldir, void *dirent)
+{
+ struct udf_fileident_bh fibh;
+ struct fileIdentDesc *fi=NULL;
+ struct fileIdentDesc cfi;
+ int block, iblock;
+ loff_t nf_pos = filp->f_pos - 1;
+ int flen;
+ char fname[UDF_NAME_LEN];
+ char *nameptr;
+ uint16_t liu;
+ uint8_t lfi;
+ loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
+ struct buffer_head * bh = NULL, * tmp, * bha[16];
+ kernel_lb_addr bloc, eloc;
+ uint32_t extoffset, elen, offset;
+ int i, num;
+ unsigned int dt_type;
+
+ if (nf_pos >= size)
+ return 0;
+
+ if (nf_pos == 0)
+ nf_pos = (udf_ext0_offset(dir) >> 2);
+
+ fibh.soffset = fibh.eoffset = (nf_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
+ if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
+ fibh.sbh = fibh.ebh = NULL;
+ else if (inode_bmap(dir, nf_pos >> (dir->i_sb->s_blocksize_bits - 2),
+ &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
+ {
+ offset >>= dir->i_sb->s_blocksize_bits;
+ block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
+ if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
+ {
+ if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
+ extoffset -= sizeof(short_ad);
+ else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
+ extoffset -= sizeof(long_ad);
+ }
+ else
+ offset = 0;
+
+ if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block)))
+ {
+ udf_release_data(bh);
+ return -EIO;
+ }
+
+ if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9))-1)))
+ {
+ i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
+ if (i+offset > (elen >> dir->i_sb->s_blocksize_bits))
+ i = (elen >> dir->i_sb->s_blocksize_bits)-offset;
+ for (num=0; i>0; i--)
+ {
+ block = udf_get_lb_pblock(dir->i_sb, eloc, offset+i);
+ tmp = udf_tgetblk(dir->i_sb, block);
+ if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
+ bha[num++] = tmp;
+ else
+ brelse(tmp);
+ }
+ if (num)
+ {
+ ll_rw_block(READA, num, bha);
+ for (i=0; i<num; i++)
+ brelse(bha[i]);
+ }
+ }
+ }
+ else
+ {
+ udf_release_data(bh);
+ return -ENOENT;
+ }
+
+ while ( nf_pos < size )
+ {
+ filp->f_pos = nf_pos + 1;
+
+ fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
+
+ if (!fi)
+ {
+ if (fibh.sbh != fibh.ebh)
+ udf_release_data(fibh.ebh);
+ udf_release_data(fibh.sbh);
+ udf_release_data(bh);
+ return 0;
+ }
+
+ liu = le16_to_cpu(cfi.lengthOfImpUse);
+ lfi = cfi.lengthFileIdent;
+
+ if (fibh.sbh == fibh.ebh)
+ nameptr = fi->fileIdent + liu;
+ else
+ {
+ int poffset; /* Unpaded ending offset */
+
+ poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
+
+ if (poffset >= lfi)
+ nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
+ else
+ {
+ nameptr = fname;
+ memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
+ memcpy(nameptr + lfi - poffset, fibh.ebh->b_data, poffset);
+ }
+ }
+
+ if ( (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
+ {
+ if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE) )
+ continue;
+ }
+
+ if ( (cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0 )
+ {
+ if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE) )
+ continue;
+ }
+
+ if ( cfi.fileCharacteristics & FID_FILE_CHAR_PARENT )
+ {
+ iblock = parent_ino(filp->f_dentry);
+ flen = 2;
+ memcpy(fname, "..", flen);
+ dt_type = DT_DIR;
+ }
+ else
+ {
+ kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
+
+ iblock = udf_get_lb_pblock(dir->i_sb, tloc, 0);
+ flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
+ dt_type = DT_UNKNOWN;
+ }
+
+ if (flen)
+ {
+ if (filldir(dirent, fname, flen, filp->f_pos, iblock, dt_type) < 0)
+ {
+ if (fibh.sbh != fibh.ebh)
+ udf_release_data(fibh.ebh);
+ udf_release_data(fibh.sbh);
+ udf_release_data(bh);
+ return 0;
+ }
+ }
+ } /* end while */
+
+ filp->f_pos = nf_pos + 1;
+
+ if (fibh.sbh != fibh.ebh)
+ udf_release_data(fibh.ebh);
+ udf_release_data(fibh.sbh);
+ udf_release_data(bh);
+
+ return 0;
+}
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