Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 242 insertions, 0 deletions

diff --git a/fs/udf/directory.c b/fs/udf/directory.c
new file mode 100644
index 000000000..d95230130
--- /dev/null
+++ b/fs/udf/directory.c
@@ -0,0 +1,242 @@
+/*
+ * directory.c
+ *
+ * PURPOSE
+ *	Directory related functions
+ *
+ * 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/bio.h>
+
+struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
+					 struct udf_fileident_bh *fibh,
+					 struct fileIdentDesc *cfi,
+					 struct extent_position *epos,
+					 struct kernel_lb_addr *eloc, uint32_t *elen,
+					 sector_t *offset)
+{
+	struct fileIdentDesc *fi;
+	int i, num;
+	udf_pblk_t block;
+	struct buffer_head *tmp, *bha[16];
+	struct udf_inode_info *iinfo = UDF_I(dir);
+
+	fibh->soffset = fibh->eoffset;
+
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+		fi = udf_get_fileident(iinfo->i_ext.i_data -
+				       (iinfo->i_efe ?
+					sizeof(struct extendedFileEntry) :
+					sizeof(struct fileEntry)),
+				       dir->i_sb->s_blocksize,
+				       &(fibh->eoffset));
+		if (!fi)
+			return NULL;
+
+		*nf_pos += fibh->eoffset - fibh->soffset;
+
+		memcpy((uint8_t *)cfi, (uint8_t *)fi,
+		       sizeof(struct fileIdentDesc));
+
+		return fi;
+	}
+
+	if (fibh->eoffset == dir->i_sb->s_blocksize) {
+		uint32_t lextoffset = epos->offset;
+		unsigned char blocksize_bits = dir->i_sb->s_blocksize_bits;
+
+		if (udf_next_aext(dir, epos, eloc, elen, 1) !=
+		    (EXT_RECORDED_ALLOCATED >> 30))
+			return NULL;
+
+		block = udf_get_lb_pblock(dir->i_sb, eloc, *offset);
+
+		(*offset)++;
+
+		if ((*offset << blocksize_bits) >= *elen)
+			*offset = 0;
+		else
+			epos->offset = lextoffset;
+
+		brelse(fibh->sbh);
+		fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
+		if (!fibh->sbh)
+			return NULL;
+		fibh->soffset = fibh->eoffset = 0;
+
+		if (!(*offset & ((16 >> (blocksize_bits - 9)) - 1))) {
+			i = 16 >> (blocksize_bits - 9);
+			if (i + *offset > (*elen >> blocksize_bits))
+				i = (*elen >> 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(REQ_OP_READ, REQ_RAHEAD, num, bha);
+				for (i = 0; i < num; i++)
+					brelse(bha[i]);
+			}
+		}
+	} else if (fibh->sbh != fibh->ebh) {
+		brelse(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;
+
+	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) {
+		uint32_t lextoffset = epos->offset;
+
+		if (udf_next_aext(dir, epos, eloc, elen, 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
+			epos->offset = lextoffset;
+
+		fibh->soffset -= dir->i_sb->s_blocksize;
+		fibh->eoffset -= dir->i_sb->s_blocksize;
+
+		fibh->ebh = udf_tread(dir->i_sb, block);
+		if (!fibh->ebh)
+			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 = udf_dir_entry_len(cfi);
+			*nf_pos += fi_len - (fibh->eoffset - fibh->soffset);
+			fibh->eoffset = fibh->soffset + fi_len;
+		} else {
+			memcpy((uint8_t *)cfi, (uint8_t *)fi,
+			       sizeof(struct fileIdentDesc));
+		}
+	}
+	/* Got last entry outside of dir size - fs is corrupted! */
+	if (*nf_pos > dir->i_size)
+		return NULL;
+	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, buffer=%p, offset=%p\n",
+			  buffer, offset);
+		return NULL;
+	}
+
+	ptr = buffer;
+
+	if ((*offset > 0) && (*offset < bufsize))
+		ptr += *offset;
+	fi = (struct fileIdentDesc *)ptr;
+	if (fi->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FID)) {
+		udf_debug("0x%x != TAG_IDENT_FID\n",
+			  le16_to_cpu(fi->descTag.tagIdent));
+		udf_debug("offset: %d sizeof: %lu bufsize: %d\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;
+}
+
+struct short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, uint32_t *offset,
+			      int inc)
+{
+	struct short_ad *sa;
+
+	if ((!ptr) || (!offset)) {
+		pr_err("%s: invalidparms\n", __func__);
+		return NULL;
+	}
+
+	if ((*offset + sizeof(struct short_ad)) > maxoffset)
+		return NULL;
+	else {
+		sa = (struct short_ad *)ptr;
+		if (sa->extLength == 0)
+			return NULL;
+	}
+
+	if (inc)
+		*offset += sizeof(struct short_ad);
+	return sa;
+}
+
+struct long_ad *udf_get_filelongad(uint8_t *ptr, int maxoffset, uint32_t *offset, int inc)
+{
+	struct long_ad *la;
+
+	if ((!ptr) || (!offset)) {
+		pr_err("%s: invalidparms\n", __func__);
+		return NULL;
+	}
+
+	if ((*offset + sizeof(struct long_ad)) > maxoffset)
+		return NULL;
+	else {
+		la = (struct long_ad *)ptr;
+		if (la->extLength == 0)
+			return NULL;
+	}
+
+	if (inc)
+		*offset += sizeof(struct long_ad);
+	return la;
+}