1 files changed, 343 insertions, 0 deletions

diff --git a/fs/udf/directory.c b/fs/udf/directory.c
new file mode 100644
index 000000000000..9a61ecc5451b
--- /dev/null
+++ b/fs/udf/directory.c
@@ -0,0 +1,343 @@
+/*
+ * directory.c
+ *
+ * PURPOSE
+ *      Directory related functions
+ *
+ * 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.
+ */
+
+#include "udfdecl.h"
+#include "udf_i.h"
+
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/buffer_head.h>
+
+#if 0
+static uint8_t *
+udf_filead_read(struct inode *dir, uint8_t *tmpad, uint8_t ad_size,
+                kernel_lb_addr fe_loc, int *pos, int *offset,
+                struct buffer_head **bh, int *error)
+{
+        int loffset = *offset;
+        int block;
+        uint8_t *ad;
+        int remainder;
+
+        *error = 0;
+
+        ad = (uint8_t *)(*bh)->b_data + *offset;
+        *offset += ad_size;
+
+        if (!ad)
+        {
+                udf_release_data(*bh);
+                *error = 1;
+                return NULL;
+        }
+
+        if (*offset == dir->i_sb->s_blocksize)
+        {
+                udf_release_data(*bh);
+                block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
+                if (!block)
+                        return NULL;
+                if (!(*bh = udf_tread(dir->i_sb, block)))
+                        return NULL;
+        }
+        else if (*offset > dir->i_sb->s_blocksize)
+        {
+                ad = tmpad;
+
+                remainder = dir->i_sb->s_blocksize - loffset;
+                memcpy((uint8_t *)ad, (*bh)->b_data + loffset, remainder);
+
+                udf_release_data(*bh);
+                block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
+                if (!block)
+                        return NULL;
+                if (!((*bh) = udf_tread(dir->i_sb, block)))
+                        return NULL;
+
+                memcpy((uint8_t *)ad + remainder, (*bh)->b_data, ad_size - remainder);
+                *offset = ad_size - remainder;
+        }
+        return ad;
+}
+#endif
+
+struct fileIdentDesc *
+udf_fileident_read(struct inode *dir, loff_t *nf_pos,
+        struct udf_fileident_bh *fibh,
+        struct fileIdentDesc *cfi,
+        kernel_lb_addr *bloc, uint32_t *extoffset, 
+        kernel_lb_addr *eloc, uint32_t *elen,
+        uint32_t *offset, struct buffer_head **bh)
+{
+        struct fileIdentDesc *fi;
+        int i, num, block;
+        struct buffer_head * tmp, * bha[16];
+
+        fibh->soffset = fibh->eoffset;
+
+        if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
+        {
+                fi = udf_get_fileident(UDF_I_DATA(dir) -
+                        (UDF_I_EFE(dir) ?
+                                sizeof(struct extendedFileEntry) :
+                                sizeof(struct fileEntry)),
+                        dir->i_sb->s_blocksize, &(fibh->eoffset));
+
+                if (!fi)
+                        return NULL;
+
+                *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2);
+
+                memcpy((uint8_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc));
+
+                return fi;
+        }
+
+        if (fibh->eoffset == dir->i_sb->s_blocksize)
+        {
+                int lextoffset = *extoffset;
+
+                if (udf_next_aext(dir, bloc, extoffset, eloc, elen, bh, 1) !=
+                        (EXT_RECORDED_ALLOCATED >> 30))
+                {
+                        return NULL;
+                }
+
+                block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset);
+
+                (*offset) ++;
+
+                if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen)
+                        *offset = 0;
+                else
+                        *extoffset = lextoffset;
+
+                udf_release_data(fibh->sbh);
+                if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block)))
+                        return NULL;
+                fibh->soffset = fibh->eoffset = 0;
+
+                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 if (fibh->sbh != fibh->ebh)
+        {
+                udf_release_data(fibh->sbh);
+                fibh->sbh = fibh->ebh;
+        }
+
+        fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize,
+                &(fibh->eoffset));
+
+        if (!fi)
+                return NULL;
+
+        *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2);
+
+        if (fibh->eoffset <= dir->i_sb->s_blocksize)
+        {
+                memcpy((uint8_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc));
+        }
+        else if (fibh->eoffset > dir->i_sb->s_blocksize)
+        {
+                int lextoffset = *extoffset;
+
+                if (udf_next_aext(dir, bloc, extoffset, eloc, elen, bh, 1) !=
+                        (EXT_RECORDED_ALLOCATED >> 30))
+                {
+                        return NULL;
+                }
+
+                block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset);
+
+                (*offset) ++;
+
+                if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen)
+                        *offset = 0;
+                else
+                        *extoffset = lextoffset;
+
+                fibh->soffset -= dir->i_sb->s_blocksize;
+                fibh->eoffset -= dir->i_sb->s_blocksize;
+
+                if (!(fibh->ebh = udf_tread(dir->i_sb, block)))
+                        return NULL;
+
+                if (sizeof(struct fileIdentDesc) > - fibh->soffset)
+                {
+                        int fi_len;
+
+                        memcpy((uint8_t *)cfi, (uint8_t *)fi, - fibh->soffset);
+                        memcpy((uint8_t *)cfi - fibh->soffset, fibh->ebh->b_data,
+                                sizeof(struct fileIdentDesc) + fibh->soffset);
+
+                        fi_len = (sizeof(struct fileIdentDesc) + cfi->lengthFileIdent +
+                                le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3;
+
+                        *nf_pos += ((fi_len - (fibh->eoffset - fibh->soffset)) >> 2);
+                        fibh->eoffset = fibh->soffset + fi_len;
+                }
+                else
+                {
+                        memcpy((uint8_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc));
+                }
+        }
+        return fi;
+}
+
+struct fileIdentDesc * 
+udf_get_fileident(void * buffer, int bufsize, int * offset)
+{
+        struct fileIdentDesc *fi;
+        int lengthThisIdent;
+        uint8_t * ptr;
+        int padlen;
+
+        if ( (!buffer) || (!offset) ) {
+                udf_debug("invalidparms\n, buffer=%p, offset=%p\n", buffer, offset);
+                return NULL;
+        }
+
+        ptr = buffer;
+
+        if ( (*offset > 0) && (*offset < bufsize) ) {
+                ptr += *offset;
+        }
+        fi=(struct fileIdentDesc *)ptr;
+        if (le16_to_cpu(fi->descTag.tagIdent) != TAG_IDENT_FID)
+        {
+                udf_debug("0x%x != TAG_IDENT_FID\n",
+                        le16_to_cpu(fi->descTag.tagIdent));
+                udf_debug("offset: %u sizeof: %lu bufsize: %u\n",
+                        *offset, (unsigned long)sizeof(struct fileIdentDesc), bufsize);
+                return NULL;
+        }
+        if ( (*offset + sizeof(struct fileIdentDesc)) > bufsize )
+        {
+                lengthThisIdent = sizeof(struct fileIdentDesc);
+        }
+        else
+                lengthThisIdent = sizeof(struct fileIdentDesc) +
+                        fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse);
+
+        /* we need to figure padding, too! */
+        padlen = lengthThisIdent % UDF_NAME_PAD;
+        if (padlen)
+                lengthThisIdent += (UDF_NAME_PAD - padlen);
+        *offset = *offset + lengthThisIdent;
+
+        return fi;
+}
+
+#if 0
+static extent_ad *
+udf_get_fileextent(void * buffer, int bufsize, int * offset)
+{
+        extent_ad * ext;
+        struct fileEntry *fe;
+        uint8_t * ptr;
+
+        if ( (!buffer) || (!offset) )
+        {
+                printk(KERN_ERR "udf: udf_get_fileextent() invalidparms\n");
+                return NULL;
+        }
+
+        fe = (struct fileEntry *)buffer;
+
+        if ( le16_to_cpu(fe->descTag.tagIdent) != TAG_IDENT_FE )
+        {
+                udf_debug("0x%x != TAG_IDENT_FE\n",
+                        le16_to_cpu(fe->descTag.tagIdent));
+                return NULL;
+        }
+
+        ptr=(uint8_t *)(fe->extendedAttr) + le32_to_cpu(fe->lengthExtendedAttr);
+
+        if ( (*offset > 0) && (*offset < le32_to_cpu(fe->lengthAllocDescs)) )
+        {
+                ptr += *offset;
+        }
+
+        ext = (extent_ad *)ptr;
+
+        *offset = *offset + sizeof(extent_ad);
+        return ext;
+}
+#endif
+
+short_ad *
+udf_get_fileshortad(uint8_t *ptr, int maxoffset, int *offset, int inc)
+{
+        short_ad *sa;
+
+        if ( (!ptr) || (!offset) )
+        {
+                printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n");
+                return NULL;
+        }
+
+        if ( (*offset < 0) || ((*offset + sizeof(short_ad)) > maxoffset) )
+                return NULL;
+        else if ((sa = (short_ad *)ptr)->extLength == 0)
+                return NULL;
+
+        if (inc)
+                *offset += sizeof(short_ad);
+        return sa;
+}
+
+long_ad *
+udf_get_filelongad(uint8_t *ptr, int maxoffset, int * offset, int inc)
+{
+        long_ad *la;
+
+        if ( (!ptr) || (!offset) ) 
+        {
+                printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n");
+                return NULL;
+        }
+
+        if ( (*offset < 0) || ((*offset + sizeof(long_ad)) > maxoffset) )
+                return NULL;
+        else if ((la = (long_ad *)ptr)->extLength == 0)
+                return NULL;
+
+        if (inc)
+                *offset += sizeof(long_ad);
+        return la;
+}