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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/udf/directory.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/udf/directory.c')
-rw-r--r--fs/udf/directory.c343
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;
+}