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-rw-r--r--fs/isofs/Kconfig40
-rw-r--r--fs/isofs/Makefile11
-rw-r--r--fs/isofs/compress.c389
-rw-r--r--fs/isofs/dir.c283
-rw-r--r--fs/isofs/export.c193
-rw-r--r--fs/isofs/inode.c1612
-rw-r--r--fs/isofs/isofs.h201
-rw-r--r--fs/isofs/joliet.c68
-rw-r--r--fs/isofs/namei.c174
-rw-r--r--fs/isofs/rock.c809
-rw-r--r--fs/isofs/rock.h123
-rw-r--r--fs/isofs/util.c71
-rw-r--r--fs/isofs/zisofs.h16
13 files changed, 3990 insertions, 0 deletions
diff --git a/fs/isofs/Kconfig b/fs/isofs/Kconfig
new file mode 100644
index 000000000..08ffd37b9
--- /dev/null
+++ b/fs/isofs/Kconfig
@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config ISO9660_FS
+ tristate "ISO 9660 CDROM file system support"
+ help
+ This is the standard file system used on CD-ROMs. It was previously
+ known as "High Sierra File System" and is called "hsfs" on other
+ Unix systems. The so-called Rock-Ridge extensions which allow for
+ long Unix filenames and symbolic links are also supported by this
+ driver. If you have a CD-ROM drive and want to do more with it than
+ just listen to audio CDs and watch its LEDs, say Y (and read
+ <file:Documentation/filesystems/isofs.rst> and the CD-ROM-HOWTO,
+ available from <http://www.tldp.org/docs.html#howto>), thereby
+ enlarging your kernel by about 27 KB; otherwise say N.
+
+ To compile this file system support as a module, choose M here: the
+ module will be called isofs.
+
+config JOLIET
+ bool "Microsoft Joliet CDROM extensions"
+ depends on ISO9660_FS
+ select NLS
+ help
+ Joliet is a Microsoft extension for the ISO 9660 CD-ROM file system
+ which allows for long filenames in unicode format (unicode is the
+ new 16 bit character code, successor to ASCII, which encodes the
+ characters of almost all languages of the world; see
+ <http://www.unicode.org/> for more information). Say Y here if you
+ want to be able to read Joliet CD-ROMs under Linux.
+
+config ZISOFS
+ bool "Transparent decompression extension"
+ depends on ISO9660_FS
+ select ZLIB_INFLATE
+ help
+ This is a Linux-specific extension to RockRidge which lets you store
+ data in compressed form on a CD-ROM and have it transparently
+ decompressed when the CD-ROM is accessed. See
+ <http://www.kernel.org/pub/linux/utils/fs/zisofs/> for the tools
+ necessary to create such a filesystem. Say Y here if you want to be
+ able to read such compressed CD-ROMs.
diff --git a/fs/isofs/Makefile b/fs/isofs/Makefile
new file mode 100644
index 000000000..6498fd2b0
--- /dev/null
+++ b/fs/isofs/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Linux isofs filesystem routines.
+#
+
+obj-$(CONFIG_ISO9660_FS) += isofs.o
+
+isofs-objs-y := namei.o inode.o dir.o util.o rock.o export.o
+isofs-objs-$(CONFIG_JOLIET) += joliet.o
+isofs-objs-$(CONFIG_ZISOFS) += compress.o
+isofs-objs := $(isofs-objs-y)
diff --git a/fs/isofs/compress.c b/fs/isofs/compress.c
new file mode 100644
index 000000000..c4da3f634
--- /dev/null
+++ b/fs/isofs/compress.c
@@ -0,0 +1,389 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ * Copyright 2001 H. Peter Anvin - All Rights Reserved
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * linux/fs/isofs/compress.c
+ *
+ * Transparent decompression of files on an iso9660 filesystem
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/bio.h>
+
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/zlib.h>
+
+#include "isofs.h"
+#include "zisofs.h"
+
+/* This should probably be global. */
+static char zisofs_sink_page[PAGE_SIZE];
+
+/*
+ * This contains the zlib memory allocation and the mutex for the
+ * allocation; this avoids failures at block-decompression time.
+ */
+static void *zisofs_zlib_workspace;
+static DEFINE_MUTEX(zisofs_zlib_lock);
+
+/*
+ * Read data of @inode from @block_start to @block_end and uncompress
+ * to one zisofs block. Store the data in the @pages array with @pcount
+ * entries. Start storing at offset @poffset of the first page.
+ */
+static loff_t zisofs_uncompress_block(struct inode *inode, loff_t block_start,
+ loff_t block_end, int pcount,
+ struct page **pages, unsigned poffset,
+ int *errp)
+{
+ unsigned int zisofs_block_shift = ISOFS_I(inode)->i_format_parm[1];
+ unsigned int bufsize = ISOFS_BUFFER_SIZE(inode);
+ unsigned int bufshift = ISOFS_BUFFER_BITS(inode);
+ unsigned int bufmask = bufsize - 1;
+ int i, block_size = block_end - block_start;
+ z_stream stream = { .total_out = 0,
+ .avail_in = 0,
+ .avail_out = 0, };
+ int zerr;
+ int needblocks = (block_size + (block_start & bufmask) + bufmask)
+ >> bufshift;
+ int haveblocks;
+ blkcnt_t blocknum;
+ struct buffer_head **bhs;
+ int curbh, curpage;
+
+ if (block_size > deflateBound(1UL << zisofs_block_shift)) {
+ *errp = -EIO;
+ return 0;
+ }
+ /* Empty block? */
+ if (block_size == 0) {
+ for ( i = 0 ; i < pcount ; i++ ) {
+ if (!pages[i])
+ continue;
+ memzero_page(pages[i], 0, PAGE_SIZE);
+ SetPageUptodate(pages[i]);
+ }
+ return ((loff_t)pcount) << PAGE_SHIFT;
+ }
+
+ /* Because zlib is not thread-safe, do all the I/O at the top. */
+ blocknum = block_start >> bufshift;
+ bhs = kcalloc(needblocks + 1, sizeof(*bhs), GFP_KERNEL);
+ if (!bhs) {
+ *errp = -ENOMEM;
+ return 0;
+ }
+ haveblocks = isofs_get_blocks(inode, blocknum, bhs, needblocks);
+ bh_read_batch(haveblocks, bhs);
+
+ curbh = 0;
+ curpage = 0;
+ /*
+ * First block is special since it may be fractional. We also wait for
+ * it before grabbing the zlib mutex; odds are that the subsequent
+ * blocks are going to come in in short order so we don't hold the zlib
+ * mutex longer than necessary.
+ */
+
+ if (!bhs[0])
+ goto b_eio;
+
+ wait_on_buffer(bhs[0]);
+ if (!buffer_uptodate(bhs[0])) {
+ *errp = -EIO;
+ goto b_eio;
+ }
+
+ stream.workspace = zisofs_zlib_workspace;
+ mutex_lock(&zisofs_zlib_lock);
+
+ zerr = zlib_inflateInit(&stream);
+ if (zerr != Z_OK) {
+ if (zerr == Z_MEM_ERROR)
+ *errp = -ENOMEM;
+ else
+ *errp = -EIO;
+ printk(KERN_DEBUG "zisofs: zisofs_inflateInit returned %d\n",
+ zerr);
+ goto z_eio;
+ }
+
+ while (curpage < pcount && curbh < haveblocks &&
+ zerr != Z_STREAM_END) {
+ if (!stream.avail_out) {
+ if (pages[curpage]) {
+ stream.next_out = kmap_local_page(pages[curpage])
+ + poffset;
+ stream.avail_out = PAGE_SIZE - poffset;
+ poffset = 0;
+ } else {
+ stream.next_out = (void *)&zisofs_sink_page;
+ stream.avail_out = PAGE_SIZE;
+ }
+ }
+ if (!stream.avail_in) {
+ wait_on_buffer(bhs[curbh]);
+ if (!buffer_uptodate(bhs[curbh])) {
+ *errp = -EIO;
+ break;
+ }
+ stream.next_in = bhs[curbh]->b_data +
+ (block_start & bufmask);
+ stream.avail_in = min_t(unsigned, bufsize -
+ (block_start & bufmask),
+ block_size);
+ block_size -= stream.avail_in;
+ block_start = 0;
+ }
+
+ while (stream.avail_out && stream.avail_in) {
+ zerr = zlib_inflate(&stream, Z_SYNC_FLUSH);
+ if (zerr == Z_BUF_ERROR && stream.avail_in == 0)
+ break;
+ if (zerr == Z_STREAM_END)
+ break;
+ if (zerr != Z_OK) {
+ /* EOF, error, or trying to read beyond end of input */
+ if (zerr == Z_MEM_ERROR)
+ *errp = -ENOMEM;
+ else {
+ printk(KERN_DEBUG
+ "zisofs: zisofs_inflate returned"
+ " %d, inode = %lu,"
+ " page idx = %d, bh idx = %d,"
+ " avail_in = %ld,"
+ " avail_out = %ld\n",
+ zerr, inode->i_ino, curpage,
+ curbh, stream.avail_in,
+ stream.avail_out);
+ *errp = -EIO;
+ }
+ goto inflate_out;
+ }
+ }
+
+ if (!stream.avail_out) {
+ /* This page completed */
+ if (pages[curpage]) {
+ flush_dcache_page(pages[curpage]);
+ SetPageUptodate(pages[curpage]);
+ }
+ if (stream.next_out != (unsigned char *)zisofs_sink_page) {
+ kunmap_local(stream.next_out);
+ stream.next_out = NULL;
+ }
+ curpage++;
+ }
+ if (!stream.avail_in)
+ curbh++;
+ }
+inflate_out:
+ zlib_inflateEnd(&stream);
+ if (stream.next_out && stream.next_out != (unsigned char *)zisofs_sink_page)
+ kunmap_local(stream.next_out);
+
+z_eio:
+ mutex_unlock(&zisofs_zlib_lock);
+
+b_eio:
+ for (i = 0; i < haveblocks; i++)
+ brelse(bhs[i]);
+ kfree(bhs);
+ return stream.total_out;
+}
+
+/*
+ * Uncompress data so that pages[full_page] is fully uptodate and possibly
+ * fills in other pages if we have data for them.
+ */
+static int zisofs_fill_pages(struct inode *inode, int full_page, int pcount,
+ struct page **pages)
+{
+ loff_t start_off, end_off;
+ loff_t block_start, block_end;
+ unsigned int header_size = ISOFS_I(inode)->i_format_parm[0];
+ unsigned int zisofs_block_shift = ISOFS_I(inode)->i_format_parm[1];
+ unsigned int blockptr;
+ loff_t poffset = 0;
+ blkcnt_t cstart_block, cend_block;
+ struct buffer_head *bh;
+ unsigned int blkbits = ISOFS_BUFFER_BITS(inode);
+ unsigned int blksize = 1 << blkbits;
+ int err;
+ loff_t ret;
+
+ BUG_ON(!pages[full_page]);
+
+ /*
+ * We want to read at least 'full_page' page. Because we have to
+ * uncompress the whole compression block anyway, fill the surrounding
+ * pages with the data we have anyway...
+ */
+ start_off = page_offset(pages[full_page]);
+ end_off = min_t(loff_t, start_off + PAGE_SIZE, inode->i_size);
+
+ cstart_block = start_off >> zisofs_block_shift;
+ cend_block = (end_off + (1 << zisofs_block_shift) - 1)
+ >> zisofs_block_shift;
+
+ WARN_ON(start_off - (full_page << PAGE_SHIFT) !=
+ ((cstart_block << zisofs_block_shift) & PAGE_MASK));
+
+ /* Find the pointer to this specific chunk */
+ /* Note: we're not using isonum_731() here because the data is known aligned */
+ /* Note: header_size is in 32-bit words (4 bytes) */
+ blockptr = (header_size + cstart_block) << 2;
+ bh = isofs_bread(inode, blockptr >> blkbits);
+ if (!bh)
+ return -EIO;
+ block_start = le32_to_cpu(*(__le32 *)
+ (bh->b_data + (blockptr & (blksize - 1))));
+
+ while (cstart_block < cend_block && pcount > 0) {
+ /* Load end of the compressed block in the file */
+ blockptr += 4;
+ /* Traversed to next block? */
+ if (!(blockptr & (blksize - 1))) {
+ brelse(bh);
+
+ bh = isofs_bread(inode, blockptr >> blkbits);
+ if (!bh)
+ return -EIO;
+ }
+ block_end = le32_to_cpu(*(__le32 *)
+ (bh->b_data + (blockptr & (blksize - 1))));
+ if (block_start > block_end) {
+ brelse(bh);
+ return -EIO;
+ }
+ err = 0;
+ ret = zisofs_uncompress_block(inode, block_start, block_end,
+ pcount, pages, poffset, &err);
+ poffset += ret;
+ pages += poffset >> PAGE_SHIFT;
+ pcount -= poffset >> PAGE_SHIFT;
+ full_page -= poffset >> PAGE_SHIFT;
+ poffset &= ~PAGE_MASK;
+
+ if (err) {
+ brelse(bh);
+ /*
+ * Did we finish reading the page we really wanted
+ * to read?
+ */
+ if (full_page < 0)
+ return 0;
+ return err;
+ }
+
+ block_start = block_end;
+ cstart_block++;
+ }
+
+ if (poffset && *pages) {
+ memzero_page(*pages, poffset, PAGE_SIZE - poffset);
+ SetPageUptodate(*pages);
+ }
+ return 0;
+}
+
+/*
+ * When decompressing, we typically obtain more than one page
+ * per reference. We inject the additional pages into the page
+ * cache as a form of readahead.
+ */
+static int zisofs_read_folio(struct file *file, struct folio *folio)
+{
+ struct page *page = &folio->page;
+ struct inode *inode = file_inode(file);
+ struct address_space *mapping = inode->i_mapping;
+ int err;
+ int i, pcount, full_page;
+ unsigned int zisofs_block_shift = ISOFS_I(inode)->i_format_parm[1];
+ unsigned int zisofs_pages_per_cblock =
+ PAGE_SHIFT <= zisofs_block_shift ?
+ (1 << (zisofs_block_shift - PAGE_SHIFT)) : 0;
+ struct page **pages;
+ pgoff_t index = page->index, end_index;
+
+ end_index = (inode->i_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ /*
+ * If this page is wholly outside i_size we just return zero;
+ * do_generic_file_read() will handle this for us
+ */
+ if (index >= end_index) {
+ SetPageUptodate(page);
+ unlock_page(page);
+ return 0;
+ }
+
+ if (PAGE_SHIFT <= zisofs_block_shift) {
+ /* We have already been given one page, this is the one
+ we must do. */
+ full_page = index & (zisofs_pages_per_cblock - 1);
+ pcount = min_t(int, zisofs_pages_per_cblock,
+ end_index - (index & ~(zisofs_pages_per_cblock - 1)));
+ index -= full_page;
+ } else {
+ full_page = 0;
+ pcount = 1;
+ }
+ pages = kcalloc(max_t(unsigned int, zisofs_pages_per_cblock, 1),
+ sizeof(*pages), GFP_KERNEL);
+ if (!pages) {
+ unlock_page(page);
+ return -ENOMEM;
+ }
+ pages[full_page] = page;
+
+ for (i = 0; i < pcount; i++, index++) {
+ if (i != full_page)
+ pages[i] = grab_cache_page_nowait(mapping, index);
+ if (pages[i])
+ ClearPageError(pages[i]);
+ }
+
+ err = zisofs_fill_pages(inode, full_page, pcount, pages);
+
+ /* Release any residual pages, do not SetPageUptodate */
+ for (i = 0; i < pcount; i++) {
+ if (pages[i]) {
+ flush_dcache_page(pages[i]);
+ if (i == full_page && err)
+ SetPageError(pages[i]);
+ unlock_page(pages[i]);
+ if (i != full_page)
+ put_page(pages[i]);
+ }
+ }
+
+ /* At this point, err contains 0 or -EIO depending on the "critical" page */
+ kfree(pages);
+ return err;
+}
+
+const struct address_space_operations zisofs_aops = {
+ .read_folio = zisofs_read_folio,
+ /* No bmap operation supported */
+};
+
+int __init zisofs_init(void)
+{
+ zisofs_zlib_workspace = vmalloc(zlib_inflate_workspacesize());
+ if ( !zisofs_zlib_workspace )
+ return -ENOMEM;
+
+ return 0;
+}
+
+void zisofs_cleanup(void)
+{
+ vfree(zisofs_zlib_workspace);
+}
diff --git a/fs/isofs/dir.c b/fs/isofs/dir.c
new file mode 100644
index 000000000..eb2f8273e
--- /dev/null
+++ b/fs/isofs/dir.c
@@ -0,0 +1,283 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/isofs/dir.c
+ *
+ * (C) 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
+ *
+ * (C) 1991 Linus Torvalds - minix filesystem
+ *
+ * Steve Beynon : Missing last directory entries fixed
+ * (stephen@askone.demon.co.uk) : 21st June 1996
+ *
+ * isofs directory handling functions
+ */
+#include <linux/gfp.h>
+#include "isofs.h"
+
+int isofs_name_translate(struct iso_directory_record *de, char *new, struct inode *inode)
+{
+ char * old = de->name;
+ int len = de->name_len[0];
+ int i;
+
+ for (i = 0; i < len; i++) {
+ unsigned char c = old[i];
+ if (!c)
+ break;
+
+ if (c >= 'A' && c <= 'Z')
+ c |= 0x20; /* lower case */
+
+ /* Drop trailing '.;1' (ISO 9660:1988 7.5.1 requires period) */
+ if (c == '.' && i == len - 3 && old[i + 1] == ';' && old[i + 2] == '1')
+ break;
+
+ /* Drop trailing ';1' */
+ if (c == ';' && i == len - 2 && old[i + 1] == '1')
+ break;
+
+ /* Convert remaining ';' to '.' */
+ /* Also '/' to '.' (broken Acorn-generated ISO9660 images) */
+ if (c == ';' || c == '/')
+ c = '.';
+
+ new[i] = c;
+ }
+ return i;
+}
+
+/* Acorn extensions written by Matthew Wilcox <willy@infradead.org> 1998 */
+int get_acorn_filename(struct iso_directory_record *de,
+ char *retname, struct inode *inode)
+{
+ int std;
+ unsigned char *chr;
+ int retnamlen = isofs_name_translate(de, retname, inode);
+
+ if (retnamlen == 0)
+ return 0;
+ std = sizeof(struct iso_directory_record) + de->name_len[0];
+ if (std & 1)
+ std++;
+ if (de->length[0] - std != 32)
+ return retnamlen;
+ chr = ((unsigned char *) de) + std;
+ if (strncmp(chr, "ARCHIMEDES", 10))
+ return retnamlen;
+ if ((*retname == '_') && ((chr[19] & 1) == 1))
+ *retname = '!';
+ if (((de->flags[0] & 2) == 0) && (chr[13] == 0xff)
+ && ((chr[12] & 0xf0) == 0xf0)) {
+ retname[retnamlen] = ',';
+ sprintf(retname+retnamlen+1, "%3.3x",
+ ((chr[12] & 0xf) << 8) | chr[11]);
+ retnamlen += 4;
+ }
+ return retnamlen;
+}
+
+/*
+ * This should _really_ be cleaned up some day..
+ */
+static int do_isofs_readdir(struct inode *inode, struct file *file,
+ struct dir_context *ctx,
+ char *tmpname, struct iso_directory_record *tmpde)
+{
+ unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
+ unsigned char bufbits = ISOFS_BUFFER_BITS(inode);
+ unsigned long block, offset, block_saved, offset_saved;
+ unsigned long inode_number = 0; /* Quiet GCC */
+ struct buffer_head *bh = NULL;
+ int len;
+ int map;
+ int first_de = 1;
+ char *p = NULL; /* Quiet GCC */
+ struct iso_directory_record *de;
+ struct isofs_sb_info *sbi = ISOFS_SB(inode->i_sb);
+
+ offset = ctx->pos & (bufsize - 1);
+ block = ctx->pos >> bufbits;
+
+ while (ctx->pos < inode->i_size) {
+ int de_len;
+
+ if (!bh) {
+ bh = isofs_bread(inode, block);
+ if (!bh)
+ return 0;
+ }
+
+ de = (struct iso_directory_record *) (bh->b_data + offset);
+
+ de_len = *(unsigned char *)de;
+
+ /*
+ * If the length byte is zero, we should move on to the next
+ * CDROM sector. If we are at the end of the directory, we
+ * kick out of the while loop.
+ */
+
+ if (de_len == 0) {
+ brelse(bh);
+ bh = NULL;
+ ctx->pos = (ctx->pos + ISOFS_BLOCK_SIZE) & ~(ISOFS_BLOCK_SIZE - 1);
+ block = ctx->pos >> bufbits;
+ offset = 0;
+ continue;
+ }
+
+ block_saved = block;
+ offset_saved = offset;
+ offset += de_len;
+
+ /* Make sure we have a full directory entry */
+ if (offset >= bufsize) {
+ int slop = bufsize - offset + de_len;
+ memcpy(tmpde, de, slop);
+ offset &= bufsize - 1;
+ block++;
+ brelse(bh);
+ bh = NULL;
+ if (offset) {
+ bh = isofs_bread(inode, block);
+ if (!bh)
+ return 0;
+ memcpy((void *) tmpde + slop, bh->b_data, offset);
+ }
+ de = tmpde;
+ }
+ /* Basic sanity check, whether name doesn't exceed dir entry */
+ if (de_len < de->name_len[0] +
+ sizeof(struct iso_directory_record)) {
+ printk(KERN_NOTICE "iso9660: Corrupted directory entry"
+ " in block %lu of inode %lu\n", block,
+ inode->i_ino);
+ brelse(bh);
+ return -EIO;
+ }
+
+ if (first_de) {
+ isofs_normalize_block_and_offset(de,
+ &block_saved,
+ &offset_saved);
+ inode_number = isofs_get_ino(block_saved,
+ offset_saved, bufbits);
+ }
+
+ if (de->flags[-sbi->s_high_sierra] & 0x80) {
+ first_de = 0;
+ ctx->pos += de_len;
+ continue;
+ }
+ first_de = 1;
+
+ /* Handle the case of the '.' directory */
+ if (de->name_len[0] == 1 && de->name[0] == 0) {
+ if (!dir_emit_dot(file, ctx))
+ break;
+ ctx->pos += de_len;
+ continue;
+ }
+
+ len = 0;
+
+ /* Handle the case of the '..' directory */
+ if (de->name_len[0] == 1 && de->name[0] == 1) {
+ if (!dir_emit_dotdot(file, ctx))
+ break;
+ ctx->pos += de_len;
+ continue;
+ }
+
+ /* Handle everything else. Do name translation if there
+ is no Rock Ridge NM field. */
+
+ /*
+ * Do not report hidden files if so instructed, or associated
+ * files unless instructed to do so
+ */
+ if ((sbi->s_hide && (de->flags[-sbi->s_high_sierra] & 1)) ||
+ (!sbi->s_showassoc &&
+ (de->flags[-sbi->s_high_sierra] & 4))) {
+ ctx->pos += de_len;
+ continue;
+ }
+
+ map = 1;
+ if (sbi->s_rock) {
+ len = get_rock_ridge_filename(de, tmpname, inode);
+ if (len != 0) { /* may be -1 */
+ p = tmpname;
+ map = 0;
+ }
+ }
+ if (map) {
+#ifdef CONFIG_JOLIET
+ if (sbi->s_joliet_level) {
+ len = get_joliet_filename(de, tmpname, inode);
+ p = tmpname;
+ } else
+#endif
+ if (sbi->s_mapping == 'a') {
+ len = get_acorn_filename(de, tmpname, inode);
+ p = tmpname;
+ } else
+ if (sbi->s_mapping == 'n') {
+ len = isofs_name_translate(de, tmpname, inode);
+ p = tmpname;
+ } else {
+ p = de->name;
+ len = de->name_len[0];
+ }
+ }
+ if (len > 0) {
+ if (!dir_emit(ctx, p, len, inode_number, DT_UNKNOWN))
+ break;
+ }
+ ctx->pos += de_len;
+ }
+ if (bh)
+ brelse(bh);
+ return 0;
+}
+
+/*
+ * Handle allocation of temporary space for name translation and
+ * handling split directory entries.. The real work is done by
+ * "do_isofs_readdir()".
+ */
+static int isofs_readdir(struct file *file, struct dir_context *ctx)
+{
+ int result;
+ char *tmpname;
+ struct iso_directory_record *tmpde;
+ struct inode *inode = file_inode(file);
+
+ tmpname = (char *)__get_free_page(GFP_KERNEL);
+ if (tmpname == NULL)
+ return -ENOMEM;
+
+ tmpde = (struct iso_directory_record *) (tmpname+1024);
+
+ result = do_isofs_readdir(inode, file, ctx, tmpname, tmpde);
+
+ free_page((unsigned long) tmpname);
+ return result;
+}
+
+const struct file_operations isofs_dir_operations =
+{
+ .llseek = generic_file_llseek,
+ .read = generic_read_dir,
+ .iterate_shared = isofs_readdir,
+};
+
+/*
+ * directories can handle most operations...
+ */
+const struct inode_operations isofs_dir_inode_operations =
+{
+ .lookup = isofs_lookup,
+};
+
+
diff --git a/fs/isofs/export.c b/fs/isofs/export.c
new file mode 100644
index 000000000..35768a63f
--- /dev/null
+++ b/fs/isofs/export.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * fs/isofs/export.c
+ *
+ * (C) 2004 Paul Serice - The new inode scheme requires switching
+ * from iget() to iget5_locked() which means
+ * the NFS export operations have to be hand
+ * coded because the default routines rely on
+ * iget().
+ *
+ * The following files are helpful:
+ *
+ * Documentation/filesystems/nfs/exporting.rst
+ * fs/exportfs/expfs.c.
+ */
+
+#include "isofs.h"
+
+static struct dentry *
+isofs_export_iget(struct super_block *sb,
+ unsigned long block,
+ unsigned long offset,
+ __u32 generation)
+{
+ struct inode *inode;
+
+ if (block == 0)
+ return ERR_PTR(-ESTALE);
+ inode = isofs_iget(sb, block, offset);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+ if (generation && inode->i_generation != generation) {
+ iput(inode);
+ return ERR_PTR(-ESTALE);
+ }
+ return d_obtain_alias(inode);
+}
+
+/* This function is surprisingly simple. The trick is understanding
+ * that "child" is always a directory. So, to find its parent, you
+ * simply need to find its ".." entry, normalize its block and offset,
+ * and return the underlying inode. See the comments for
+ * isofs_normalize_block_and_offset(). */
+static struct dentry *isofs_export_get_parent(struct dentry *child)
+{
+ unsigned long parent_block = 0;
+ unsigned long parent_offset = 0;
+ struct inode *child_inode = d_inode(child);
+ struct iso_inode_info *e_child_inode = ISOFS_I(child_inode);
+ struct iso_directory_record *de = NULL;
+ struct buffer_head * bh = NULL;
+ struct dentry *rv = NULL;
+
+ /* "child" must always be a directory. */
+ if (!S_ISDIR(child_inode->i_mode)) {
+ printk(KERN_ERR "isofs: isofs_export_get_parent(): "
+ "child is not a directory!\n");
+ rv = ERR_PTR(-EACCES);
+ goto out;
+ }
+
+ /* It is an invariant that the directory offset is zero. If
+ * it is not zero, it means the directory failed to be
+ * normalized for some reason. */
+ if (e_child_inode->i_iget5_offset != 0) {
+ printk(KERN_ERR "isofs: isofs_export_get_parent(): "
+ "child directory not normalized!\n");
+ rv = ERR_PTR(-EACCES);
+ goto out;
+ }
+
+ /* The child inode has been normalized such that its
+ * i_iget5_block value points to the "." entry. Fortunately,
+ * the ".." entry is located in the same block. */
+ parent_block = e_child_inode->i_iget5_block;
+
+ /* Get the block in question. */
+ bh = sb_bread(child_inode->i_sb, parent_block);
+ if (bh == NULL) {
+ rv = ERR_PTR(-EACCES);
+ goto out;
+ }
+
+ /* This is the "." entry. */
+ de = (struct iso_directory_record*)bh->b_data;
+
+ /* The ".." entry is always the second entry. */
+ parent_offset = (unsigned long)isonum_711(de->length);
+ de = (struct iso_directory_record*)(bh->b_data + parent_offset);
+
+ /* Verify it is in fact the ".." entry. */
+ if ((isonum_711(de->name_len) != 1) || (de->name[0] != 1)) {
+ printk(KERN_ERR "isofs: Unable to find the \"..\" "
+ "directory for NFS.\n");
+ rv = ERR_PTR(-EACCES);
+ goto out;
+ }
+
+ /* Normalize */
+ isofs_normalize_block_and_offset(de, &parent_block, &parent_offset);
+
+ rv = d_obtain_alias(isofs_iget(child_inode->i_sb, parent_block,
+ parent_offset));
+ out:
+ if (bh)
+ brelse(bh);
+ return rv;
+}
+
+static int
+isofs_export_encode_fh(struct inode *inode,
+ __u32 *fh32,
+ int *max_len,
+ struct inode *parent)
+{
+ struct iso_inode_info * ei = ISOFS_I(inode);
+ int len = *max_len;
+ int type = 1;
+ __u16 *fh16 = (__u16*)fh32;
+
+ /*
+ * WARNING: max_len is 5 for NFSv2. Because of this
+ * limitation, we use the lower 16 bits of fh32[1] to hold the
+ * offset of the inode and the upper 16 bits of fh32[1] to
+ * hold the offset of the parent.
+ */
+ if (parent && (len < 5)) {
+ *max_len = 5;
+ return FILEID_INVALID;
+ } else if (len < 3) {
+ *max_len = 3;
+ return FILEID_INVALID;
+ }
+
+ len = 3;
+ fh32[0] = ei->i_iget5_block;
+ fh16[2] = (__u16)ei->i_iget5_offset; /* fh16 [sic] */
+ fh16[3] = 0; /* avoid leaking uninitialized data */
+ fh32[2] = inode->i_generation;
+ if (parent) {
+ struct iso_inode_info *eparent;
+ eparent = ISOFS_I(parent);
+ fh32[3] = eparent->i_iget5_block;
+ fh16[3] = (__u16)eparent->i_iget5_offset; /* fh16 [sic] */
+ fh32[4] = parent->i_generation;
+ len = 5;
+ type = 2;
+ }
+ *max_len = len;
+ return type;
+}
+
+struct isofs_fid {
+ u32 block;
+ u16 offset;
+ u16 parent_offset;
+ u32 generation;
+ u32 parent_block;
+ u32 parent_generation;
+};
+
+static struct dentry *isofs_fh_to_dentry(struct super_block *sb,
+ struct fid *fid, int fh_len, int fh_type)
+{
+ struct isofs_fid *ifid = (struct isofs_fid *)fid;
+
+ if (fh_len < 3 || fh_type > 2)
+ return NULL;
+
+ return isofs_export_iget(sb, ifid->block, ifid->offset,
+ ifid->generation);
+}
+
+static struct dentry *isofs_fh_to_parent(struct super_block *sb,
+ struct fid *fid, int fh_len, int fh_type)
+{
+ struct isofs_fid *ifid = (struct isofs_fid *)fid;
+
+ if (fh_len < 2 || fh_type != 2)
+ return NULL;
+
+ return isofs_export_iget(sb,
+ fh_len > 2 ? ifid->parent_block : 0,
+ ifid->parent_offset,
+ fh_len > 4 ? ifid->parent_generation : 0);
+}
+
+const struct export_operations isofs_export_ops = {
+ .encode_fh = isofs_export_encode_fh,
+ .fh_to_dentry = isofs_fh_to_dentry,
+ .fh_to_parent = isofs_fh_to_parent,
+ .get_parent = isofs_export_get_parent,
+};
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
new file mode 100644
index 000000000..df9d70588
--- /dev/null
+++ b/fs/isofs/inode.c
@@ -0,0 +1,1612 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/fs/isofs/inode.c
+ *
+ * (C) 1991 Linus Torvalds - minix filesystem
+ * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
+ * 1994 Eberhard Mönkeberg - multi session handling.
+ * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
+ * 1997 Gordon Chaffee - Joliet CDs
+ * 1998 Eric Lammerts - ISO 9660 Level 3
+ * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB
+ * 2004 Paul Serice - NFS Export Operations
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <linux/slab.h>
+#include <linux/cred.h>
+#include <linux/nls.h>
+#include <linux/ctype.h>
+#include <linux/statfs.h>
+#include <linux/cdrom.h>
+#include <linux/parser.h>
+#include <linux/mpage.h>
+#include <linux/user_namespace.h>
+#include <linux/seq_file.h>
+#include <linux/blkdev.h>
+
+#include "isofs.h"
+#include "zisofs.h"
+
+/* max tz offset is 13 hours */
+#define MAX_TZ_OFFSET (52*15*60)
+
+#define BEQUIET
+
+static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
+static int isofs_dentry_cmpi(const struct dentry *dentry,
+ unsigned int len, const char *str, const struct qstr *name);
+
+#ifdef CONFIG_JOLIET
+static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
+static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
+static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
+ unsigned int len, const char *str, const struct qstr *name);
+static int isofs_dentry_cmp_ms(const struct dentry *dentry,
+ unsigned int len, const char *str, const struct qstr *name);
+#endif
+
+static void isofs_put_super(struct super_block *sb)
+{
+ struct isofs_sb_info *sbi = ISOFS_SB(sb);
+
+#ifdef CONFIG_JOLIET
+ unload_nls(sbi->s_nls_iocharset);
+#endif
+
+ kfree(sbi);
+ sb->s_fs_info = NULL;
+ return;
+}
+
+static int isofs_read_inode(struct inode *, int relocated);
+static int isofs_statfs (struct dentry *, struct kstatfs *);
+static int isofs_show_options(struct seq_file *, struct dentry *);
+
+static struct kmem_cache *isofs_inode_cachep;
+
+static struct inode *isofs_alloc_inode(struct super_block *sb)
+{
+ struct iso_inode_info *ei;
+ ei = alloc_inode_sb(sb, isofs_inode_cachep, GFP_KERNEL);
+ if (!ei)
+ return NULL;
+ return &ei->vfs_inode;
+}
+
+static void isofs_free_inode(struct inode *inode)
+{
+ kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
+}
+
+static void init_once(void *foo)
+{
+ struct iso_inode_info *ei = foo;
+
+ inode_init_once(&ei->vfs_inode);
+}
+
+static int __init init_inodecache(void)
+{
+ isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
+ sizeof(struct iso_inode_info),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD|SLAB_ACCOUNT),
+ init_once);
+ if (!isofs_inode_cachep)
+ return -ENOMEM;
+ return 0;
+}
+
+static void destroy_inodecache(void)
+{
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(isofs_inode_cachep);
+}
+
+static int isofs_remount(struct super_block *sb, int *flags, char *data)
+{
+ sync_filesystem(sb);
+ if (!(*flags & SB_RDONLY))
+ return -EROFS;
+ return 0;
+}
+
+static const struct super_operations isofs_sops = {
+ .alloc_inode = isofs_alloc_inode,
+ .free_inode = isofs_free_inode,
+ .put_super = isofs_put_super,
+ .statfs = isofs_statfs,
+ .remount_fs = isofs_remount,
+ .show_options = isofs_show_options,
+};
+
+
+static const struct dentry_operations isofs_dentry_ops[] = {
+ {
+ .d_hash = isofs_hashi,
+ .d_compare = isofs_dentry_cmpi,
+ },
+#ifdef CONFIG_JOLIET
+ {
+ .d_hash = isofs_hash_ms,
+ .d_compare = isofs_dentry_cmp_ms,
+ },
+ {
+ .d_hash = isofs_hashi_ms,
+ .d_compare = isofs_dentry_cmpi_ms,
+ },
+#endif
+};
+
+struct iso9660_options{
+ unsigned int rock:1;
+ unsigned int joliet:1;
+ unsigned int cruft:1;
+ unsigned int hide:1;
+ unsigned int showassoc:1;
+ unsigned int nocompress:1;
+ unsigned int overriderockperm:1;
+ unsigned int uid_set:1;
+ unsigned int gid_set:1;
+ unsigned char map;
+ unsigned char check;
+ unsigned int blocksize;
+ umode_t fmode;
+ umode_t dmode;
+ kgid_t gid;
+ kuid_t uid;
+ char *iocharset;
+ /* LVE */
+ s32 session;
+ s32 sbsector;
+};
+
+/*
+ * Compute the hash for the isofs name corresponding to the dentry.
+ */
+static int
+isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
+{
+ const char *name;
+ int len;
+ char c;
+ unsigned long hash;
+
+ len = qstr->len;
+ name = qstr->name;
+ if (ms) {
+ while (len && name[len-1] == '.')
+ len--;
+ }
+
+ hash = init_name_hash(dentry);
+ while (len--) {
+ c = tolower(*name++);
+ hash = partial_name_hash(c, hash);
+ }
+ qstr->hash = end_name_hash(hash);
+
+ return 0;
+}
+
+/*
+ * Compare of two isofs names.
+ */
+static int isofs_dentry_cmp_common(
+ unsigned int len, const char *str,
+ const struct qstr *name, int ms, int ci)
+{
+ int alen, blen;
+
+ /* A filename cannot end in '.' or we treat it like it has none */
+ alen = name->len;
+ blen = len;
+ if (ms) {
+ while (alen && name->name[alen-1] == '.')
+ alen--;
+ while (blen && str[blen-1] == '.')
+ blen--;
+ }
+ if (alen == blen) {
+ if (ci) {
+ if (strncasecmp(name->name, str, alen) == 0)
+ return 0;
+ } else {
+ if (strncmp(name->name, str, alen) == 0)
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static int
+isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
+{
+ return isofs_hashi_common(dentry, qstr, 0);
+}
+
+static int
+isofs_dentry_cmpi(const struct dentry *dentry,
+ unsigned int len, const char *str, const struct qstr *name)
+{
+ return isofs_dentry_cmp_common(len, str, name, 0, 1);
+}
+
+#ifdef CONFIG_JOLIET
+/*
+ * Compute the hash for the isofs name corresponding to the dentry.
+ */
+static int
+isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
+{
+ const char *name;
+ int len;
+
+ len = qstr->len;
+ name = qstr->name;
+ if (ms) {
+ while (len && name[len-1] == '.')
+ len--;
+ }
+
+ qstr->hash = full_name_hash(dentry, name, len);
+
+ return 0;
+}
+
+static int
+isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
+{
+ return isofs_hash_common(dentry, qstr, 1);
+}
+
+static int
+isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
+{
+ return isofs_hashi_common(dentry, qstr, 1);
+}
+
+static int
+isofs_dentry_cmp_ms(const struct dentry *dentry,
+ unsigned int len, const char *str, const struct qstr *name)
+{
+ return isofs_dentry_cmp_common(len, str, name, 1, 0);
+}
+
+static int
+isofs_dentry_cmpi_ms(const struct dentry *dentry,
+ unsigned int len, const char *str, const struct qstr *name)
+{
+ return isofs_dentry_cmp_common(len, str, name, 1, 1);
+}
+#endif
+
+enum {
+ Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
+ Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
+ Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
+ Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
+};
+
+static const match_table_t tokens = {
+ {Opt_norock, "norock"},
+ {Opt_nojoliet, "nojoliet"},
+ {Opt_unhide, "unhide"},
+ {Opt_hide, "hide"},
+ {Opt_showassoc, "showassoc"},
+ {Opt_cruft, "cruft"},
+ {Opt_utf8, "utf8"},
+ {Opt_iocharset, "iocharset=%s"},
+ {Opt_map_a, "map=acorn"},
+ {Opt_map_a, "map=a"},
+ {Opt_map_n, "map=normal"},
+ {Opt_map_n, "map=n"},
+ {Opt_map_o, "map=off"},
+ {Opt_map_o, "map=o"},
+ {Opt_session, "session=%u"},
+ {Opt_sb, "sbsector=%u"},
+ {Opt_check_r, "check=relaxed"},
+ {Opt_check_r, "check=r"},
+ {Opt_check_s, "check=strict"},
+ {Opt_check_s, "check=s"},
+ {Opt_uid, "uid=%u"},
+ {Opt_gid, "gid=%u"},
+ {Opt_mode, "mode=%u"},
+ {Opt_dmode, "dmode=%u"},
+ {Opt_overriderockperm, "overriderockperm"},
+ {Opt_block, "block=%u"},
+ {Opt_ignore, "conv=binary"},
+ {Opt_ignore, "conv=b"},
+ {Opt_ignore, "conv=text"},
+ {Opt_ignore, "conv=t"},
+ {Opt_ignore, "conv=mtext"},
+ {Opt_ignore, "conv=m"},
+ {Opt_ignore, "conv=auto"},
+ {Opt_ignore, "conv=a"},
+ {Opt_nocompress, "nocompress"},
+ {Opt_err, NULL}
+};
+
+static int parse_options(char *options, struct iso9660_options *popt)
+{
+ char *p;
+ int option;
+ unsigned int uv;
+
+ popt->map = 'n';
+ popt->rock = 1;
+ popt->joliet = 1;
+ popt->cruft = 0;
+ popt->hide = 0;
+ popt->showassoc = 0;
+ popt->check = 'u'; /* unset */
+ popt->nocompress = 0;
+ popt->blocksize = 1024;
+ popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
+ popt->uid_set = 0;
+ popt->gid_set = 0;
+ popt->gid = GLOBAL_ROOT_GID;
+ popt->uid = GLOBAL_ROOT_UID;
+ popt->iocharset = NULL;
+ popt->overriderockperm = 0;
+ popt->session=-1;
+ popt->sbsector=-1;
+ if (!options)
+ return 1;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token;
+ substring_t args[MAX_OPT_ARGS];
+ unsigned n;
+
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_norock:
+ popt->rock = 0;
+ break;
+ case Opt_nojoliet:
+ popt->joliet = 0;
+ break;
+ case Opt_hide:
+ popt->hide = 1;
+ break;
+ case Opt_unhide:
+ case Opt_showassoc:
+ popt->showassoc = 1;
+ break;
+ case Opt_cruft:
+ popt->cruft = 1;
+ break;
+#ifdef CONFIG_JOLIET
+ case Opt_utf8:
+ kfree(popt->iocharset);
+ popt->iocharset = kstrdup("utf8", GFP_KERNEL);
+ if (!popt->iocharset)
+ return 0;
+ break;
+ case Opt_iocharset:
+ kfree(popt->iocharset);
+ popt->iocharset = match_strdup(&args[0]);
+ if (!popt->iocharset)
+ return 0;
+ break;
+#endif
+ case Opt_map_a:
+ popt->map = 'a';
+ break;
+ case Opt_map_o:
+ popt->map = 'o';
+ break;
+ case Opt_map_n:
+ popt->map = 'n';
+ break;
+ case Opt_session:
+ if (match_int(&args[0], &option))
+ return 0;
+ n = option;
+ /*
+ * Track numbers are supposed to be in range 1-99, the
+ * mount option starts indexing at 0.
+ */
+ if (n >= 99)
+ return 0;
+ popt->session = n + 1;
+ break;
+ case Opt_sb:
+ if (match_int(&args[0], &option))
+ return 0;
+ popt->sbsector = option;
+ break;
+ case Opt_check_r:
+ popt->check = 'r';
+ break;
+ case Opt_check_s:
+ popt->check = 's';
+ break;
+ case Opt_ignore:
+ break;
+ case Opt_uid:
+ if (match_uint(&args[0], &uv))
+ return 0;
+ popt->uid = make_kuid(current_user_ns(), uv);
+ if (!uid_valid(popt->uid))
+ return 0;
+ popt->uid_set = 1;
+ break;
+ case Opt_gid:
+ if (match_uint(&args[0], &uv))
+ return 0;
+ popt->gid = make_kgid(current_user_ns(), uv);
+ if (!gid_valid(popt->gid))
+ return 0;
+ popt->gid_set = 1;
+ break;
+ case Opt_mode:
+ if (match_int(&args[0], &option))
+ return 0;
+ popt->fmode = option;
+ break;
+ case Opt_dmode:
+ if (match_int(&args[0], &option))
+ return 0;
+ popt->dmode = option;
+ break;
+ case Opt_overriderockperm:
+ popt->overriderockperm = 1;
+ break;
+ case Opt_block:
+ if (match_int(&args[0], &option))
+ return 0;
+ n = option;
+ if (n != 512 && n != 1024 && n != 2048)
+ return 0;
+ popt->blocksize = n;
+ break;
+ case Opt_nocompress:
+ popt->nocompress = 1;
+ break;
+ default:
+ return 0;
+ }
+ }
+ return 1;
+}
+
+/*
+ * Display the mount options in /proc/mounts.
+ */
+static int isofs_show_options(struct seq_file *m, struct dentry *root)
+{
+ struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
+
+ if (!sbi->s_rock) seq_puts(m, ",norock");
+ else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
+ if (sbi->s_cruft) seq_puts(m, ",cruft");
+ if (sbi->s_hide) seq_puts(m, ",hide");
+ if (sbi->s_nocompress) seq_puts(m, ",nocompress");
+ if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
+ if (sbi->s_showassoc) seq_puts(m, ",showassoc");
+
+ if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
+ if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
+ if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1);
+ if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
+
+ if (root->d_sb->s_blocksize != 1024)
+ seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
+
+ if (sbi->s_uid_set)
+ seq_printf(m, ",uid=%u",
+ from_kuid_munged(&init_user_ns, sbi->s_uid));
+ if (sbi->s_gid_set)
+ seq_printf(m, ",gid=%u",
+ from_kgid_munged(&init_user_ns, sbi->s_gid));
+
+ if (sbi->s_dmode != ISOFS_INVALID_MODE)
+ seq_printf(m, ",dmode=%o", sbi->s_dmode);
+ if (sbi->s_fmode != ISOFS_INVALID_MODE)
+ seq_printf(m, ",fmode=%o", sbi->s_fmode);
+
+#ifdef CONFIG_JOLIET
+ if (sbi->s_nls_iocharset)
+ seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
+ else
+ seq_puts(m, ",iocharset=utf8");
+#endif
+ return 0;
+}
+
+/*
+ * look if the driver can tell the multi session redirection value
+ *
+ * don't change this if you don't know what you do, please!
+ * Multisession is legal only with XA disks.
+ * A non-XA disk with more than one volume descriptor may do it right, but
+ * usually is written in a nowhere standardized "multi-partition" manner.
+ * Multisession uses absolute addressing (solely the first frame of the whole
+ * track is #0), multi-partition uses relative addressing (each first frame of
+ * each track is #0), and a track is not a session.
+ *
+ * A broken CDwriter software or drive firmware does not set new standards,
+ * at least not if conflicting with the existing ones.
+ *
+ * emoenke@gwdg.de
+ */
+#define WE_OBEY_THE_WRITTEN_STANDARDS 1
+
+static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
+{
+ struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
+ unsigned int vol_desc_start = 0;
+
+ if (session > 0) {
+ struct cdrom_tocentry te;
+
+ if (!cdi)
+ return 0;
+
+ te.cdte_track = session;
+ te.cdte_format = CDROM_LBA;
+ if (cdrom_read_tocentry(cdi, &te) == 0) {
+ printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
+ session, te.cdte_addr.lba,
+ te.cdte_ctrl & CDROM_DATA_TRACK);
+ if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4)
+ return te.cdte_addr.lba;
+ }
+
+ printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
+ }
+
+ if (cdi) {
+ struct cdrom_multisession ms_info;
+
+ ms_info.addr_format = CDROM_LBA;
+ if (cdrom_multisession(cdi, &ms_info) == 0) {
+#if WE_OBEY_THE_WRITTEN_STANDARDS
+ /* necessary for a valid ms_info.addr */
+ if (ms_info.xa_flag)
+#endif
+ vol_desc_start = ms_info.addr.lba;
+ }
+ }
+
+ return vol_desc_start;
+}
+
+/*
+ * Check if root directory is empty (has less than 3 files).
+ *
+ * Used to detect broken CDs where ISO root directory is empty but Joliet root
+ * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
+ * (and Joliet used instead) or else no files would be visible.
+ */
+static bool rootdir_empty(struct super_block *sb, unsigned long block)
+{
+ int offset = 0, files = 0, de_len;
+ struct iso_directory_record *de;
+ struct buffer_head *bh;
+
+ bh = sb_bread(sb, block);
+ if (!bh)
+ return true;
+ while (files < 3) {
+ de = (struct iso_directory_record *) (bh->b_data + offset);
+ de_len = *(unsigned char *) de;
+ if (de_len == 0)
+ break;
+ files++;
+ offset += de_len;
+ }
+ brelse(bh);
+ return files < 3;
+}
+
+/*
+ * Initialize the superblock and read the root inode.
+ */
+static int isofs_fill_super(struct super_block *s, void *data, int silent)
+{
+ struct buffer_head *bh = NULL, *pri_bh = NULL;
+ struct hs_primary_descriptor *h_pri = NULL;
+ struct iso_primary_descriptor *pri = NULL;
+ struct iso_supplementary_descriptor *sec = NULL;
+ struct iso_directory_record *rootp;
+ struct inode *inode;
+ struct iso9660_options opt;
+ struct isofs_sb_info *sbi;
+ unsigned long first_data_zone;
+ int joliet_level = 0;
+ int iso_blknum, block;
+ int orig_zonesize;
+ int table, error = -EINVAL;
+ unsigned int vol_desc_start;
+
+ sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
+ if (!sbi)
+ return -ENOMEM;
+ s->s_fs_info = sbi;
+
+ if (!parse_options((char *)data, &opt))
+ goto out_freesbi;
+
+ /*
+ * First of all, get the hardware blocksize for this device.
+ * If we don't know what it is, or the hardware blocksize is
+ * larger than the blocksize the user specified, then use
+ * that value.
+ */
+ /*
+ * What if bugger tells us to go beyond page size?
+ */
+ if (bdev_logical_block_size(s->s_bdev) > 2048) {
+ printk(KERN_WARNING
+ "ISOFS: unsupported/invalid hardware sector size %d\n",
+ bdev_logical_block_size(s->s_bdev));
+ goto out_freesbi;
+ }
+ opt.blocksize = sb_min_blocksize(s, opt.blocksize);
+
+ sbi->s_high_sierra = 0; /* default is iso9660 */
+ sbi->s_session = opt.session;
+ sbi->s_sbsector = opt.sbsector;
+
+ vol_desc_start = (opt.sbsector != -1) ?
+ opt.sbsector : isofs_get_last_session(s,opt.session);
+
+ for (iso_blknum = vol_desc_start+16;
+ iso_blknum < vol_desc_start+100; iso_blknum++) {
+ struct hs_volume_descriptor *hdp;
+ struct iso_volume_descriptor *vdp;
+
+ block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
+ if (!(bh = sb_bread(s, block)))
+ goto out_no_read;
+
+ vdp = (struct iso_volume_descriptor *)bh->b_data;
+ hdp = (struct hs_volume_descriptor *)bh->b_data;
+
+ /*
+ * Due to the overlapping physical location of the descriptors,
+ * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
+ * proper identification in this case, we first check for ISO.
+ */
+ if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
+ if (isonum_711(vdp->type) == ISO_VD_END)
+ break;
+ if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
+ if (!pri) {
+ pri = (struct iso_primary_descriptor *)vdp;
+ /* Save the buffer in case we need it ... */
+ pri_bh = bh;
+ bh = NULL;
+ }
+ }
+#ifdef CONFIG_JOLIET
+ else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
+ sec = (struct iso_supplementary_descriptor *)vdp;
+ if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
+ if (opt.joliet) {
+ if (sec->escape[2] == 0x40)
+ joliet_level = 1;
+ else if (sec->escape[2] == 0x43)
+ joliet_level = 2;
+ else if (sec->escape[2] == 0x45)
+ joliet_level = 3;
+
+ printk(KERN_DEBUG "ISO 9660 Extensions: "
+ "Microsoft Joliet Level %d\n",
+ joliet_level);
+ }
+ goto root_found;
+ } else {
+ /* Unknown supplementary volume descriptor */
+ sec = NULL;
+ }
+ }
+#endif
+ } else {
+ if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
+ if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
+ goto out_freebh;
+
+ sbi->s_high_sierra = 1;
+ opt.rock = 0;
+ h_pri = (struct hs_primary_descriptor *)vdp;
+ goto root_found;
+ }
+ }
+
+ /* Just skip any volume descriptors we don't recognize */
+
+ brelse(bh);
+ bh = NULL;
+ }
+ /*
+ * If we fall through, either no volume descriptor was found,
+ * or else we passed a primary descriptor looking for others.
+ */
+ if (!pri)
+ goto out_unknown_format;
+ brelse(bh);
+ bh = pri_bh;
+ pri_bh = NULL;
+
+root_found:
+ /* We don't support read-write mounts */
+ if (!sb_rdonly(s)) {
+ error = -EACCES;
+ goto out_freebh;
+ }
+
+ if (joliet_level && (!pri || !opt.rock)) {
+ /* This is the case of Joliet with the norock mount flag.
+ * A disc with both Joliet and Rock Ridge is handled later
+ */
+ pri = (struct iso_primary_descriptor *) sec;
+ }
+
+ if(sbi->s_high_sierra){
+ rootp = (struct iso_directory_record *) h_pri->root_directory_record;
+ sbi->s_nzones = isonum_733(h_pri->volume_space_size);
+ sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
+ sbi->s_max_size = isonum_733(h_pri->volume_space_size);
+ } else {
+ if (!pri)
+ goto out_freebh;
+ rootp = (struct iso_directory_record *) pri->root_directory_record;
+ sbi->s_nzones = isonum_733(pri->volume_space_size);
+ sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
+ sbi->s_max_size = isonum_733(pri->volume_space_size);
+ }
+
+ sbi->s_ninodes = 0; /* No way to figure this out easily */
+
+ orig_zonesize = sbi->s_log_zone_size;
+ /*
+ * If the zone size is smaller than the hardware sector size,
+ * this is a fatal error. This would occur if the disc drive
+ * had sectors that were 2048 bytes, but the filesystem had
+ * blocks that were 512 bytes (which should only very rarely
+ * happen.)
+ */
+ if (orig_zonesize < opt.blocksize)
+ goto out_bad_size;
+
+ /* RDE: convert log zone size to bit shift */
+ switch (sbi->s_log_zone_size) {
+ case 512: sbi->s_log_zone_size = 9; break;
+ case 1024: sbi->s_log_zone_size = 10; break;
+ case 2048: sbi->s_log_zone_size = 11; break;
+
+ default:
+ goto out_bad_zone_size;
+ }
+
+ s->s_magic = ISOFS_SUPER_MAGIC;
+
+ /*
+ * With multi-extent files, file size is only limited by the maximum
+ * size of a file system, which is 8 TB.
+ */
+ s->s_maxbytes = 0x80000000000LL;
+
+ /* ECMA-119 timestamp from 1900/1/1 with tz offset */
+ s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
+ s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
+
+ /* Set this for reference. Its not currently used except on write
+ which we don't have .. */
+
+ first_data_zone = isonum_733(rootp->extent) +
+ isonum_711(rootp->ext_attr_length);
+ sbi->s_firstdatazone = first_data_zone;
+#ifndef BEQUIET
+ printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
+ sbi->s_max_size, 1UL << sbi->s_log_zone_size);
+ printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
+ if(sbi->s_high_sierra)
+ printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
+#endif
+
+ /*
+ * If the Joliet level is set, we _may_ decide to use the
+ * secondary descriptor, but can't be sure until after we
+ * read the root inode. But before reading the root inode
+ * we may need to change the device blocksize, and would
+ * rather release the old buffer first. So, we cache the
+ * first_data_zone value from the secondary descriptor.
+ */
+ if (joliet_level) {
+ pri = (struct iso_primary_descriptor *) sec;
+ rootp = (struct iso_directory_record *)
+ pri->root_directory_record;
+ first_data_zone = isonum_733(rootp->extent) +
+ isonum_711(rootp->ext_attr_length);
+ }
+
+ /*
+ * We're all done using the volume descriptor, and may need
+ * to change the device blocksize, so release the buffer now.
+ */
+ brelse(pri_bh);
+ brelse(bh);
+
+ /*
+ * Force the blocksize to 512 for 512 byte sectors. The file
+ * read primitives really get it wrong in a bad way if we don't
+ * do this.
+ *
+ * Note - we should never be setting the blocksize to something
+ * less than the hardware sector size for the device. If we
+ * do, we would end up having to read larger buffers and split
+ * out portions to satisfy requests.
+ *
+ * Note2- the idea here is that we want to deal with the optimal
+ * zonesize in the filesystem. If we have it set to something less,
+ * then we have horrible problems with trying to piece together
+ * bits of adjacent blocks in order to properly read directory
+ * entries. By forcing the blocksize in this way, we ensure
+ * that we will never be required to do this.
+ */
+ sb_set_blocksize(s, orig_zonesize);
+
+ sbi->s_nls_iocharset = NULL;
+
+#ifdef CONFIG_JOLIET
+ if (joliet_level) {
+ char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
+ if (strcmp(p, "utf8") != 0) {
+ sbi->s_nls_iocharset = opt.iocharset ?
+ load_nls(opt.iocharset) : load_nls_default();
+ if (!sbi->s_nls_iocharset)
+ goto out_freesbi;
+ }
+ }
+#endif
+ s->s_op = &isofs_sops;
+ s->s_export_op = &isofs_export_ops;
+ sbi->s_mapping = opt.map;
+ sbi->s_rock = (opt.rock ? 2 : 0);
+ sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
+ sbi->s_cruft = opt.cruft;
+ sbi->s_hide = opt.hide;
+ sbi->s_showassoc = opt.showassoc;
+ sbi->s_uid = opt.uid;
+ sbi->s_gid = opt.gid;
+ sbi->s_uid_set = opt.uid_set;
+ sbi->s_gid_set = opt.gid_set;
+ sbi->s_nocompress = opt.nocompress;
+ sbi->s_overriderockperm = opt.overriderockperm;
+ /*
+ * It would be incredibly stupid to allow people to mark every file
+ * on the disk as suid, so we merely allow them to set the default
+ * permissions.
+ */
+ if (opt.fmode != ISOFS_INVALID_MODE)
+ sbi->s_fmode = opt.fmode & 0777;
+ else
+ sbi->s_fmode = ISOFS_INVALID_MODE;
+ if (opt.dmode != ISOFS_INVALID_MODE)
+ sbi->s_dmode = opt.dmode & 0777;
+ else
+ sbi->s_dmode = ISOFS_INVALID_MODE;
+
+ /*
+ * Read the root inode, which _may_ result in changing
+ * the s_rock flag. Once we have the final s_rock value,
+ * we then decide whether to use the Joliet descriptor.
+ */
+ inode = isofs_iget(s, sbi->s_firstdatazone, 0);
+ if (IS_ERR(inode))
+ goto out_no_root;
+
+ /*
+ * Fix for broken CDs with Rock Ridge and empty ISO root directory but
+ * correct Joliet root directory.
+ */
+ if (sbi->s_rock == 1 && joliet_level &&
+ rootdir_empty(s, sbi->s_firstdatazone)) {
+ printk(KERN_NOTICE
+ "ISOFS: primary root directory is empty. "
+ "Disabling Rock Ridge and switching to Joliet.");
+ sbi->s_rock = 0;
+ }
+
+ /*
+ * If this disk has both Rock Ridge and Joliet on it, then we
+ * want to use Rock Ridge by default. This can be overridden
+ * by using the norock mount option. There is still one other
+ * possibility that is not taken into account: a Rock Ridge
+ * CD with Unicode names. Until someone sees such a beast, it
+ * will not be supported.
+ */
+ if (sbi->s_rock == 1) {
+ joliet_level = 0;
+ } else if (joliet_level) {
+ sbi->s_rock = 0;
+ if (sbi->s_firstdatazone != first_data_zone) {
+ sbi->s_firstdatazone = first_data_zone;
+ printk(KERN_DEBUG
+ "ISOFS: changing to secondary root\n");
+ iput(inode);
+ inode = isofs_iget(s, sbi->s_firstdatazone, 0);
+ if (IS_ERR(inode))
+ goto out_no_root;
+ }
+ }
+
+ if (opt.check == 'u') {
+ /* Only Joliet is case insensitive by default */
+ if (joliet_level)
+ opt.check = 'r';
+ else
+ opt.check = 's';
+ }
+ sbi->s_joliet_level = joliet_level;
+
+ /* Make sure the root inode is a directory */
+ if (!S_ISDIR(inode->i_mode)) {
+ printk(KERN_WARNING
+ "isofs_fill_super: root inode is not a directory. "
+ "Corrupted media?\n");
+ goto out_iput;
+ }
+
+ table = 0;
+ if (joliet_level)
+ table += 2;
+ if (opt.check == 'r')
+ table++;
+ sbi->s_check = opt.check;
+
+ if (table)
+ s->s_d_op = &isofs_dentry_ops[table - 1];
+
+ /* get the root dentry */
+ s->s_root = d_make_root(inode);
+ if (!(s->s_root)) {
+ error = -ENOMEM;
+ goto out_no_inode;
+ }
+
+ kfree(opt.iocharset);
+
+ return 0;
+
+ /*
+ * Display error messages and free resources.
+ */
+out_iput:
+ iput(inode);
+ goto out_no_inode;
+out_no_root:
+ error = PTR_ERR(inode);
+ if (error != -ENOMEM)
+ printk(KERN_WARNING "%s: get root inode failed\n", __func__);
+out_no_inode:
+#ifdef CONFIG_JOLIET
+ unload_nls(sbi->s_nls_iocharset);
+#endif
+ goto out_freesbi;
+out_no_read:
+ printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
+ __func__, s->s_id, iso_blknum, block);
+ goto out_freebh;
+out_bad_zone_size:
+ printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
+ sbi->s_log_zone_size);
+ goto out_freebh;
+out_bad_size:
+ printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
+ orig_zonesize, opt.blocksize);
+ goto out_freebh;
+out_unknown_format:
+ if (!silent)
+ printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
+
+out_freebh:
+ brelse(bh);
+ brelse(pri_bh);
+out_freesbi:
+ kfree(opt.iocharset);
+ kfree(sbi);
+ s->s_fs_info = NULL;
+ return error;
+}
+
+static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
+{
+ struct super_block *sb = dentry->d_sb;
+ u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
+
+ buf->f_type = ISOFS_SUPER_MAGIC;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_blocks = (ISOFS_SB(sb)->s_nzones
+ << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
+ buf->f_bfree = 0;
+ buf->f_bavail = 0;
+ buf->f_files = ISOFS_SB(sb)->s_ninodes;
+ buf->f_ffree = 0;
+ buf->f_fsid = u64_to_fsid(id);
+ buf->f_namelen = NAME_MAX;
+ return 0;
+}
+
+/*
+ * Get a set of blocks; filling in buffer_heads if already allocated
+ * or getblk() if they are not. Returns the number of blocks inserted
+ * (-ve == error.)
+ */
+int isofs_get_blocks(struct inode *inode, sector_t iblock,
+ struct buffer_head **bh, unsigned long nblocks)
+{
+ unsigned long b_off = iblock;
+ unsigned offset, sect_size;
+ unsigned int firstext;
+ unsigned long nextblk, nextoff;
+ int section, rv, error;
+ struct iso_inode_info *ei = ISOFS_I(inode);
+
+ error = -EIO;
+ rv = 0;
+ if (iblock != b_off) {
+ printk(KERN_DEBUG "%s: block number too large\n", __func__);
+ goto abort;
+ }
+
+
+ offset = 0;
+ firstext = ei->i_first_extent;
+ sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
+ nextblk = ei->i_next_section_block;
+ nextoff = ei->i_next_section_offset;
+ section = 0;
+
+ while (nblocks) {
+ /* If we are *way* beyond the end of the file, print a message.
+ * Access beyond the end of the file up to the next page boundary
+ * is normal, however because of the way the page cache works.
+ * In this case, we just return 0 so that we can properly fill
+ * the page with useless information without generating any
+ * I/O errors.
+ */
+ if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
+ printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
+ __func__, b_off,
+ (unsigned long long)inode->i_size);
+ goto abort;
+ }
+
+ /* On the last section, nextblk == 0, section size is likely to
+ * exceed sect_size by a partial block, and access beyond the
+ * end of the file will reach beyond the section size, too.
+ */
+ while (nextblk && (b_off >= (offset + sect_size))) {
+ struct inode *ninode;
+
+ offset += sect_size;
+ ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
+ if (IS_ERR(ninode)) {
+ error = PTR_ERR(ninode);
+ goto abort;
+ }
+ firstext = ISOFS_I(ninode)->i_first_extent;
+ sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
+ nextblk = ISOFS_I(ninode)->i_next_section_block;
+ nextoff = ISOFS_I(ninode)->i_next_section_offset;
+ iput(ninode);
+
+ if (++section > 100) {
+ printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
+ " aborting...\n", __func__);
+ printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
+ "nextblk=%lu nextoff=%lu\n", __func__,
+ b_off, firstext, (unsigned) sect_size,
+ nextblk, nextoff);
+ goto abort;
+ }
+ }
+
+ if (*bh) {
+ map_bh(*bh, inode->i_sb, firstext + b_off - offset);
+ } else {
+ *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
+ if (!*bh)
+ goto abort;
+ }
+ bh++; /* Next buffer head */
+ b_off++; /* Next buffer offset */
+ nblocks--;
+ rv++;
+ }
+
+ error = 0;
+abort:
+ return rv != 0 ? rv : error;
+}
+
+/*
+ * Used by the standard interfaces.
+ */
+static int isofs_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
+{
+ int ret;
+
+ if (create) {
+ printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
+ return -EROFS;
+ }
+
+ ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
+ return ret < 0 ? ret : 0;
+}
+
+static int isofs_bmap(struct inode *inode, sector_t block)
+{
+ struct buffer_head dummy;
+ int error;
+
+ dummy.b_state = 0;
+ dummy.b_blocknr = -1000;
+ error = isofs_get_block(inode, block, &dummy, 0);
+ if (!error)
+ return dummy.b_blocknr;
+ return 0;
+}
+
+struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
+{
+ sector_t blknr = isofs_bmap(inode, block);
+ if (!blknr)
+ return NULL;
+ return sb_bread(inode->i_sb, blknr);
+}
+
+static int isofs_read_folio(struct file *file, struct folio *folio)
+{
+ return mpage_read_folio(folio, isofs_get_block);
+}
+
+static void isofs_readahead(struct readahead_control *rac)
+{
+ mpage_readahead(rac, isofs_get_block);
+}
+
+static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
+{
+ return generic_block_bmap(mapping,block,isofs_get_block);
+}
+
+static const struct address_space_operations isofs_aops = {
+ .read_folio = isofs_read_folio,
+ .readahead = isofs_readahead,
+ .bmap = _isofs_bmap
+};
+
+static int isofs_read_level3_size(struct inode *inode)
+{
+ unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
+ int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
+ struct buffer_head *bh = NULL;
+ unsigned long block, offset, block_saved, offset_saved;
+ int i = 0;
+ int more_entries = 0;
+ struct iso_directory_record *tmpde = NULL;
+ struct iso_inode_info *ei = ISOFS_I(inode);
+
+ inode->i_size = 0;
+
+ /* The first 16 blocks are reserved as the System Area. Thus,
+ * no inodes can appear in block 0. We use this to flag that
+ * this is the last section. */
+ ei->i_next_section_block = 0;
+ ei->i_next_section_offset = 0;
+
+ block = ei->i_iget5_block;
+ offset = ei->i_iget5_offset;
+
+ do {
+ struct iso_directory_record *de;
+ unsigned int de_len;
+
+ if (!bh) {
+ bh = sb_bread(inode->i_sb, block);
+ if (!bh)
+ goto out_noread;
+ }
+ de = (struct iso_directory_record *) (bh->b_data + offset);
+ de_len = *(unsigned char *) de;
+
+ if (de_len == 0) {
+ brelse(bh);
+ bh = NULL;
+ ++block;
+ offset = 0;
+ continue;
+ }
+
+ block_saved = block;
+ offset_saved = offset;
+ offset += de_len;
+
+ /* Make sure we have a full directory entry */
+ if (offset >= bufsize) {
+ int slop = bufsize - offset + de_len;
+ if (!tmpde) {
+ tmpde = kmalloc(256, GFP_KERNEL);
+ if (!tmpde)
+ goto out_nomem;
+ }
+ memcpy(tmpde, de, slop);
+ offset &= bufsize - 1;
+ block++;
+ brelse(bh);
+ bh = NULL;
+ if (offset) {
+ bh = sb_bread(inode->i_sb, block);
+ if (!bh)
+ goto out_noread;
+ memcpy((void *)tmpde+slop, bh->b_data, offset);
+ }
+ de = tmpde;
+ }
+
+ inode->i_size += isonum_733(de->size);
+ if (i == 1) {
+ ei->i_next_section_block = block_saved;
+ ei->i_next_section_offset = offset_saved;
+ }
+
+ more_entries = de->flags[-high_sierra] & 0x80;
+
+ i++;
+ if (i > 100)
+ goto out_toomany;
+ } while (more_entries);
+out:
+ kfree(tmpde);
+ brelse(bh);
+ return 0;
+
+out_nomem:
+ brelse(bh);
+ return -ENOMEM;
+
+out_noread:
+ printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
+ kfree(tmpde);
+ return -EIO;
+
+out_toomany:
+ printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
+ "isofs_read_level3_size: inode=%lu\n",
+ __func__, inode->i_ino);
+ goto out;
+}
+
+static int isofs_read_inode(struct inode *inode, int relocated)
+{
+ struct super_block *sb = inode->i_sb;
+ struct isofs_sb_info *sbi = ISOFS_SB(sb);
+ unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
+ unsigned long block;
+ int high_sierra = sbi->s_high_sierra;
+ struct buffer_head *bh;
+ struct iso_directory_record *de;
+ struct iso_directory_record *tmpde = NULL;
+ unsigned int de_len;
+ unsigned long offset;
+ struct iso_inode_info *ei = ISOFS_I(inode);
+ int ret = -EIO;
+
+ block = ei->i_iget5_block;
+ bh = sb_bread(inode->i_sb, block);
+ if (!bh)
+ goto out_badread;
+
+ offset = ei->i_iget5_offset;
+
+ de = (struct iso_directory_record *) (bh->b_data + offset);
+ de_len = *(unsigned char *) de;
+ if (de_len < sizeof(struct iso_directory_record))
+ goto fail;
+
+ if (offset + de_len > bufsize) {
+ int frag1 = bufsize - offset;
+
+ tmpde = kmalloc(de_len, GFP_KERNEL);
+ if (!tmpde) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+ memcpy(tmpde, bh->b_data + offset, frag1);
+ brelse(bh);
+ bh = sb_bread(inode->i_sb, ++block);
+ if (!bh)
+ goto out_badread;
+ memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
+ de = tmpde;
+ }
+
+ inode->i_ino = isofs_get_ino(ei->i_iget5_block,
+ ei->i_iget5_offset,
+ ISOFS_BUFFER_BITS(inode));
+
+ /* Assume it is a normal-format file unless told otherwise */
+ ei->i_file_format = isofs_file_normal;
+
+ if (de->flags[-high_sierra] & 2) {
+ if (sbi->s_dmode != ISOFS_INVALID_MODE)
+ inode->i_mode = S_IFDIR | sbi->s_dmode;
+ else
+ inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
+ set_nlink(inode, 1); /*
+ * Set to 1. We know there are 2, but
+ * the find utility tries to optimize
+ * if it is 2, and it screws up. It is
+ * easier to give 1 which tells find to
+ * do it the hard way.
+ */
+ } else {
+ if (sbi->s_fmode != ISOFS_INVALID_MODE) {
+ inode->i_mode = S_IFREG | sbi->s_fmode;
+ } else {
+ /*
+ * Set default permissions: r-x for all. The disc
+ * could be shared with DOS machines so virtually
+ * anything could be a valid executable.
+ */
+ inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
+ }
+ set_nlink(inode, 1);
+ }
+ inode->i_uid = sbi->s_uid;
+ inode->i_gid = sbi->s_gid;
+ inode->i_blocks = 0;
+
+ ei->i_format_parm[0] = 0;
+ ei->i_format_parm[1] = 0;
+ ei->i_format_parm[2] = 0;
+
+ ei->i_section_size = isonum_733(de->size);
+ if (de->flags[-high_sierra] & 0x80) {
+ ret = isofs_read_level3_size(inode);
+ if (ret < 0)
+ goto fail;
+ ret = -EIO;
+ } else {
+ ei->i_next_section_block = 0;
+ ei->i_next_section_offset = 0;
+ inode->i_size = isonum_733(de->size);
+ }
+
+ /*
+ * Some dipshit decided to store some other bit of information
+ * in the high byte of the file length. Truncate size in case
+ * this CDROM was mounted with the cruft option.
+ */
+
+ if (sbi->s_cruft)
+ inode->i_size &= 0x00ffffff;
+
+ if (de->interleave[0]) {
+ printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
+ inode->i_size = 0;
+ }
+
+ /* I have no idea what file_unit_size is used for, so
+ we will flag it for now */
+ if (de->file_unit_size[0] != 0) {
+ printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
+ inode->i_ino);
+ }
+
+ /* I have no idea what other flag bits are used for, so
+ we will flag it for now */
+#ifdef DEBUG
+ if((de->flags[-high_sierra] & ~2)!= 0){
+ printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
+ "(%ld %x).\n",
+ inode->i_ino, de->flags[-high_sierra]);
+ }
+#endif
+
+ inode->i_mtime.tv_sec =
+ inode->i_atime.tv_sec =
+ inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
+ inode->i_mtime.tv_nsec =
+ inode->i_atime.tv_nsec =
+ inode->i_ctime.tv_nsec = 0;
+
+ ei->i_first_extent = (isonum_733(de->extent) +
+ isonum_711(de->ext_attr_length));
+
+ /* Set the number of blocks for stat() - should be done before RR */
+ inode->i_blocks = (inode->i_size + 511) >> 9;
+
+ /*
+ * Now test for possible Rock Ridge extensions which will override
+ * some of these numbers in the inode structure.
+ */
+
+ if (!high_sierra) {
+ parse_rock_ridge_inode(de, inode, relocated);
+ /* if we want uid/gid set, override the rock ridge setting */
+ if (sbi->s_uid_set)
+ inode->i_uid = sbi->s_uid;
+ if (sbi->s_gid_set)
+ inode->i_gid = sbi->s_gid;
+ }
+ /* Now set final access rights if overriding rock ridge setting */
+ if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
+ sbi->s_dmode != ISOFS_INVALID_MODE)
+ inode->i_mode = S_IFDIR | sbi->s_dmode;
+ if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
+ sbi->s_fmode != ISOFS_INVALID_MODE)
+ inode->i_mode = S_IFREG | sbi->s_fmode;
+
+ /* Install the inode operations vector */
+ if (S_ISREG(inode->i_mode)) {
+ inode->i_fop = &generic_ro_fops;
+ switch (ei->i_file_format) {
+#ifdef CONFIG_ZISOFS
+ case isofs_file_compressed:
+ inode->i_data.a_ops = &zisofs_aops;
+ break;
+#endif
+ default:
+ inode->i_data.a_ops = &isofs_aops;
+ break;
+ }
+ } else if (S_ISDIR(inode->i_mode)) {
+ inode->i_op = &isofs_dir_inode_operations;
+ inode->i_fop = &isofs_dir_operations;
+ } else if (S_ISLNK(inode->i_mode)) {
+ inode->i_op = &page_symlink_inode_operations;
+ inode_nohighmem(inode);
+ inode->i_data.a_ops = &isofs_symlink_aops;
+ } else
+ /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
+ init_special_inode(inode, inode->i_mode, inode->i_rdev);
+
+ ret = 0;
+out:
+ kfree(tmpde);
+ brelse(bh);
+ return ret;
+
+out_badread:
+ printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
+fail:
+ goto out;
+}
+
+struct isofs_iget5_callback_data {
+ unsigned long block;
+ unsigned long offset;
+};
+
+static int isofs_iget5_test(struct inode *ino, void *data)
+{
+ struct iso_inode_info *i = ISOFS_I(ino);
+ struct isofs_iget5_callback_data *d =
+ (struct isofs_iget5_callback_data*)data;
+ return (i->i_iget5_block == d->block)
+ && (i->i_iget5_offset == d->offset);
+}
+
+static int isofs_iget5_set(struct inode *ino, void *data)
+{
+ struct iso_inode_info *i = ISOFS_I(ino);
+ struct isofs_iget5_callback_data *d =
+ (struct isofs_iget5_callback_data*)data;
+ i->i_iget5_block = d->block;
+ i->i_iget5_offset = d->offset;
+ return 0;
+}
+
+/* Store, in the inode's containing structure, the block and block
+ * offset that point to the underlying meta-data for the inode. The
+ * code below is otherwise similar to the iget() code in
+ * include/linux/fs.h */
+struct inode *__isofs_iget(struct super_block *sb,
+ unsigned long block,
+ unsigned long offset,
+ int relocated)
+{
+ unsigned long hashval;
+ struct inode *inode;
+ struct isofs_iget5_callback_data data;
+ long ret;
+
+ if (offset >= 1ul << sb->s_blocksize_bits)
+ return ERR_PTR(-EINVAL);
+
+ data.block = block;
+ data.offset = offset;
+
+ hashval = (block << sb->s_blocksize_bits) | offset;
+
+ inode = iget5_locked(sb, hashval, &isofs_iget5_test,
+ &isofs_iget5_set, &data);
+
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+
+ if (inode->i_state & I_NEW) {
+ ret = isofs_read_inode(inode, relocated);
+ if (ret < 0) {
+ iget_failed(inode);
+ inode = ERR_PTR(ret);
+ } else {
+ unlock_new_inode(inode);
+ }
+ }
+
+ return inode;
+}
+
+static struct dentry *isofs_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
+}
+
+static struct file_system_type iso9660_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "iso9660",
+ .mount = isofs_mount,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("iso9660");
+MODULE_ALIAS("iso9660");
+
+static int __init init_iso9660_fs(void)
+{
+ int err = init_inodecache();
+ if (err)
+ goto out;
+#ifdef CONFIG_ZISOFS
+ err = zisofs_init();
+ if (err)
+ goto out1;
+#endif
+ err = register_filesystem(&iso9660_fs_type);
+ if (err)
+ goto out2;
+ return 0;
+out2:
+#ifdef CONFIG_ZISOFS
+ zisofs_cleanup();
+out1:
+#endif
+ destroy_inodecache();
+out:
+ return err;
+}
+
+static void __exit exit_iso9660_fs(void)
+{
+ unregister_filesystem(&iso9660_fs_type);
+#ifdef CONFIG_ZISOFS
+ zisofs_cleanup();
+#endif
+ destroy_inodecache();
+}
+
+module_init(init_iso9660_fs)
+module_exit(exit_iso9660_fs)
+MODULE_LICENSE("GPL");
diff --git a/fs/isofs/isofs.h b/fs/isofs/isofs.h
new file mode 100644
index 000000000..dcdc191ed
--- /dev/null
+++ b/fs/isofs/isofs.h
@@ -0,0 +1,201 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/exportfs.h>
+#include <linux/iso_fs.h>
+#include <asm/unaligned.h>
+
+enum isofs_file_format {
+ isofs_file_normal = 0,
+ isofs_file_sparse = 1,
+ isofs_file_compressed = 2,
+};
+
+/*
+ * iso fs inode data in memory
+ */
+struct iso_inode_info {
+ unsigned long i_iget5_block;
+ unsigned long i_iget5_offset;
+ unsigned int i_first_extent;
+ unsigned char i_file_format;
+ unsigned char i_format_parm[3];
+ unsigned long i_next_section_block;
+ unsigned long i_next_section_offset;
+ off_t i_section_size;
+ struct inode vfs_inode;
+};
+
+/*
+ * iso9660 super-block data in memory
+ */
+struct isofs_sb_info {
+ unsigned long s_ninodes;
+ unsigned long s_nzones;
+ unsigned long s_firstdatazone;
+ unsigned long s_log_zone_size;
+ unsigned long s_max_size;
+
+ int s_rock_offset; /* offset of SUSP fields within SU area */
+ s32 s_sbsector;
+ unsigned char s_joliet_level;
+ unsigned char s_mapping;
+ unsigned char s_check;
+ unsigned char s_session;
+ unsigned int s_high_sierra:1;
+ unsigned int s_rock:2;
+ unsigned int s_cruft:1; /* Broken disks with high byte of length
+ * containing junk */
+ unsigned int s_nocompress:1;
+ unsigned int s_hide:1;
+ unsigned int s_showassoc:1;
+ unsigned int s_overriderockperm:1;
+ unsigned int s_uid_set:1;
+ unsigned int s_gid_set:1;
+
+ umode_t s_fmode;
+ umode_t s_dmode;
+ kgid_t s_gid;
+ kuid_t s_uid;
+ struct nls_table *s_nls_iocharset; /* Native language support table */
+};
+
+#define ISOFS_INVALID_MODE ((umode_t) -1)
+
+static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb)
+{
+ return sb->s_fs_info;
+}
+
+static inline struct iso_inode_info *ISOFS_I(struct inode *inode)
+{
+ return container_of(inode, struct iso_inode_info, vfs_inode);
+}
+
+static inline int isonum_711(u8 *p)
+{
+ return *p;
+}
+static inline int isonum_712(s8 *p)
+{
+ return *p;
+}
+static inline unsigned int isonum_721(u8 *p)
+{
+ return get_unaligned_le16(p);
+}
+static inline unsigned int isonum_722(u8 *p)
+{
+ return get_unaligned_be16(p);
+}
+static inline unsigned int isonum_723(u8 *p)
+{
+ /* Ignore bigendian datum due to broken mastering programs */
+ return get_unaligned_le16(p);
+}
+static inline unsigned int isonum_731(u8 *p)
+{
+ return get_unaligned_le32(p);
+}
+static inline unsigned int isonum_732(u8 *p)
+{
+ return get_unaligned_be32(p);
+}
+static inline unsigned int isonum_733(u8 *p)
+{
+ /* Ignore bigendian datum due to broken mastering programs */
+ return get_unaligned_le32(p);
+}
+extern int iso_date(u8 *, int);
+
+struct inode; /* To make gcc happy */
+
+extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *, int relocated);
+extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *);
+extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *);
+
+int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *);
+int get_acorn_filename(struct iso_directory_record *, char *, struct inode *);
+
+extern struct dentry *isofs_lookup(struct inode *, struct dentry *, unsigned int flags);
+extern struct buffer_head *isofs_bread(struct inode *, sector_t);
+extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long);
+
+struct inode *__isofs_iget(struct super_block *sb,
+ unsigned long block,
+ unsigned long offset,
+ int relocated);
+
+static inline struct inode *isofs_iget(struct super_block *sb,
+ unsigned long block,
+ unsigned long offset)
+{
+ return __isofs_iget(sb, block, offset, 0);
+}
+
+static inline struct inode *isofs_iget_reloc(struct super_block *sb,
+ unsigned long block,
+ unsigned long offset)
+{
+ return __isofs_iget(sb, block, offset, 1);
+}
+
+/* Because the inode number is no longer relevant to finding the
+ * underlying meta-data for an inode, we are free to choose a more
+ * convenient 32-bit number as the inode number. The inode numbering
+ * scheme was recommended by Sergey Vlasov and Eric Lammerts. */
+static inline unsigned long isofs_get_ino(unsigned long block,
+ unsigned long offset,
+ unsigned long bufbits)
+{
+ return (block << (bufbits - 5)) | (offset >> 5);
+}
+
+/* Every directory can have many redundant directory entries scattered
+ * throughout the directory tree. First there is the directory entry
+ * with the name of the directory stored in the parent directory.
+ * Then, there is the "." directory entry stored in the directory
+ * itself. Finally, there are possibly many ".." directory entries
+ * stored in all the subdirectories.
+ *
+ * In order for the NFS get_parent() method to work and for the
+ * general consistency of the dcache, we need to make sure the
+ * "i_iget5_block" and "i_iget5_offset" all point to exactly one of
+ * the many redundant entries for each directory. We normalize the
+ * block and offset by always making them point to the "." directory.
+ *
+ * Notice that we do not use the entry for the directory with the name
+ * that is located in the parent directory. Even though choosing this
+ * first directory is more natural, it is much easier to find the "."
+ * entry in the NFS get_parent() method because it is implicitly
+ * encoded in the "extent + ext_attr_length" fields of _all_ the
+ * redundant entries for the directory. Thus, it can always be
+ * reached regardless of which directory entry you have in hand.
+ *
+ * This works because the "." entry is simply the first directory
+ * record when you start reading the file that holds all the directory
+ * records, and this file starts at "extent + ext_attr_length" blocks.
+ * Because the "." entry is always the first entry listed in the
+ * directories file, the normalized "offset" value is always 0.
+ *
+ * You should pass the directory entry in "de". On return, "block"
+ * and "offset" will hold normalized values. Only directories are
+ * affected making it safe to call even for non-directory file
+ * types. */
+static inline void
+isofs_normalize_block_and_offset(struct iso_directory_record* de,
+ unsigned long *block,
+ unsigned long *offset)
+{
+ /* Only directories are normalized. */
+ if (de->flags[0] & 2) {
+ *offset = 0;
+ *block = (unsigned long)isonum_733(de->extent)
+ + (unsigned long)isonum_711(de->ext_attr_length);
+ }
+}
+
+extern const struct inode_operations isofs_dir_inode_operations;
+extern const struct file_operations isofs_dir_operations;
+extern const struct address_space_operations isofs_symlink_aops;
+extern const struct export_operations isofs_export_ops;
diff --git a/fs/isofs/joliet.c b/fs/isofs/joliet.c
new file mode 100644
index 000000000..c0f04a1e7
--- /dev/null
+++ b/fs/isofs/joliet.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/isofs/joliet.c
+ *
+ * (C) 1996 Gordon Chaffee
+ *
+ * Joliet: Microsoft's Unicode extensions to iso9660
+ */
+
+#include <linux/types.h>
+#include <linux/nls.h>
+#include "isofs.h"
+
+/*
+ * Convert Unicode 16 to UTF-8 or ASCII.
+ */
+static int
+uni16_to_x8(unsigned char *ascii, __be16 *uni, int len, struct nls_table *nls)
+{
+ __be16 *ip, ch;
+ unsigned char *op;
+
+ ip = uni;
+ op = ascii;
+
+ while ((ch = get_unaligned(ip)) && len) {
+ int llen;
+ llen = nls->uni2char(be16_to_cpu(ch), op, NLS_MAX_CHARSET_SIZE);
+ if (llen > 0)
+ op += llen;
+ else
+ *op++ = '?';
+ ip++;
+
+ len--;
+ }
+ *op = 0;
+ return (op - ascii);
+}
+
+int
+get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode)
+{
+ struct nls_table *nls;
+ unsigned char len = 0;
+
+ nls = ISOFS_SB(inode->i_sb)->s_nls_iocharset;
+
+ if (!nls) {
+ len = utf16s_to_utf8s((const wchar_t *) de->name,
+ de->name_len[0] >> 1, UTF16_BIG_ENDIAN,
+ outname, PAGE_SIZE);
+ } else {
+ len = uni16_to_x8(outname, (__be16 *) de->name,
+ de->name_len[0] >> 1, nls);
+ }
+ if ((len > 2) && (outname[len-2] == ';') && (outname[len-1] == '1'))
+ len -= 2;
+
+ /*
+ * Windows doesn't like periods at the end of a name,
+ * so neither do we
+ */
+ while (len >= 2 && (outname[len-1] == '.'))
+ len--;
+
+ return len;
+}
diff --git a/fs/isofs/namei.c b/fs/isofs/namei.c
new file mode 100644
index 000000000..58f80e1b3
--- /dev/null
+++ b/fs/isofs/namei.c
@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/isofs/namei.c
+ *
+ * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
+ *
+ * (C) 1991 Linus Torvalds - minix filesystem
+ */
+
+#include <linux/gfp.h>
+#include "isofs.h"
+
+/*
+ * ok, we cannot use strncmp, as the name is not in our data space.
+ * Thus we'll have to use isofs_match. No big problem. Match also makes
+ * some sanity tests.
+ */
+static int
+isofs_cmp(struct dentry *dentry, const char *compare, int dlen)
+{
+ struct qstr qstr;
+ qstr.name = compare;
+ qstr.len = dlen;
+ if (likely(!dentry->d_op))
+ return dentry->d_name.len != dlen || memcmp(dentry->d_name.name, compare, dlen);
+ return dentry->d_op->d_compare(NULL, dentry->d_name.len, dentry->d_name.name, &qstr);
+}
+
+/*
+ * isofs_find_entry()
+ *
+ * finds an entry in the specified directory with the wanted name. It
+ * returns the inode number of the found entry, or 0 on error.
+ */
+static unsigned long
+isofs_find_entry(struct inode *dir, struct dentry *dentry,
+ unsigned long *block_rv, unsigned long *offset_rv,
+ char *tmpname, struct iso_directory_record *tmpde)
+{
+ unsigned long bufsize = ISOFS_BUFFER_SIZE(dir);
+ unsigned char bufbits = ISOFS_BUFFER_BITS(dir);
+ unsigned long block, f_pos, offset, block_saved, offset_saved;
+ struct buffer_head *bh = NULL;
+ struct isofs_sb_info *sbi = ISOFS_SB(dir->i_sb);
+
+ if (!ISOFS_I(dir)->i_first_extent)
+ return 0;
+
+ f_pos = 0;
+ offset = 0;
+ block = 0;
+
+ while (f_pos < dir->i_size) {
+ struct iso_directory_record *de;
+ int de_len, match, i, dlen;
+ char *dpnt;
+
+ if (!bh) {
+ bh = isofs_bread(dir, block);
+ if (!bh)
+ return 0;
+ }
+
+ de = (struct iso_directory_record *) (bh->b_data + offset);
+
+ de_len = *(unsigned char *) de;
+ if (!de_len) {
+ brelse(bh);
+ bh = NULL;
+ f_pos = (f_pos + ISOFS_BLOCK_SIZE) & ~(ISOFS_BLOCK_SIZE - 1);
+ block = f_pos >> bufbits;
+ offset = 0;
+ continue;
+ }
+
+ block_saved = bh->b_blocknr;
+ offset_saved = offset;
+ offset += de_len;
+ f_pos += de_len;
+
+ /* Make sure we have a full directory entry */
+ if (offset >= bufsize) {
+ int slop = bufsize - offset + de_len;
+ memcpy(tmpde, de, slop);
+ offset &= bufsize - 1;
+ block++;
+ brelse(bh);
+ bh = NULL;
+ if (offset) {
+ bh = isofs_bread(dir, block);
+ if (!bh)
+ return 0;
+ memcpy((void *) tmpde + slop, bh->b_data, offset);
+ }
+ de = tmpde;
+ }
+
+ dlen = de->name_len[0];
+ dpnt = de->name;
+ /* Basic sanity check, whether name doesn't exceed dir entry */
+ if (de_len < dlen + sizeof(struct iso_directory_record)) {
+ printk(KERN_NOTICE "iso9660: Corrupted directory entry"
+ " in block %lu of inode %lu\n", block,
+ dir->i_ino);
+ brelse(bh);
+ return 0;
+ }
+
+ if (sbi->s_rock &&
+ ((i = get_rock_ridge_filename(de, tmpname, dir)))) {
+ dlen = i; /* possibly -1 */
+ dpnt = tmpname;
+#ifdef CONFIG_JOLIET
+ } else if (sbi->s_joliet_level) {
+ dlen = get_joliet_filename(de, tmpname, dir);
+ dpnt = tmpname;
+#endif
+ } else if (sbi->s_mapping == 'a') {
+ dlen = get_acorn_filename(de, tmpname, dir);
+ dpnt = tmpname;
+ } else if (sbi->s_mapping == 'n') {
+ dlen = isofs_name_translate(de, tmpname, dir);
+ dpnt = tmpname;
+ }
+
+ /*
+ * Skip hidden or associated files unless hide or showassoc,
+ * respectively, is set
+ */
+ match = 0;
+ if (dlen > 0 &&
+ (!sbi->s_hide ||
+ (!(de->flags[-sbi->s_high_sierra] & 1))) &&
+ (sbi->s_showassoc ||
+ (!(de->flags[-sbi->s_high_sierra] & 4)))) {
+ if (dpnt && (dlen > 1 || dpnt[0] > 1))
+ match = (isofs_cmp(dentry, dpnt, dlen) == 0);
+ }
+ if (match) {
+ isofs_normalize_block_and_offset(de,
+ &block_saved,
+ &offset_saved);
+ *block_rv = block_saved;
+ *offset_rv = offset_saved;
+ brelse(bh);
+ return 1;
+ }
+ }
+ brelse(bh);
+ return 0;
+}
+
+struct dentry *isofs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
+{
+ int found;
+ unsigned long block;
+ unsigned long offset;
+ struct inode *inode;
+ struct page *page;
+
+ page = alloc_page(GFP_USER);
+ if (!page)
+ return ERR_PTR(-ENOMEM);
+
+ found = isofs_find_entry(dir, dentry,
+ &block, &offset,
+ page_address(page),
+ 1024 + page_address(page));
+ __free_page(page);
+
+ inode = found ? isofs_iget(dir->i_sb, block, offset) : NULL;
+
+ return d_splice_alias(inode, dentry);
+}
diff --git a/fs/isofs/rock.c b/fs/isofs/rock.c
new file mode 100644
index 000000000..48f58c6c9
--- /dev/null
+++ b/fs/isofs/rock.c
@@ -0,0 +1,809 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/isofs/rock.c
+ *
+ * (C) 1992, 1993 Eric Youngdale
+ *
+ * Rock Ridge Extensions to iso9660
+ */
+
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+
+#include "isofs.h"
+#include "rock.h"
+
+/*
+ * These functions are designed to read the system areas of a directory record
+ * and extract relevant information. There are different functions provided
+ * depending upon what information we need at the time. One function fills
+ * out an inode structure, a second one extracts a filename, a third one
+ * returns a symbolic link name, and a fourth one returns the extent number
+ * for the file.
+ */
+
+#define SIG(A,B) ((A) | ((B) << 8)) /* isonum_721() */
+
+struct rock_state {
+ void *buffer;
+ unsigned char *chr;
+ int len;
+ int cont_size;
+ int cont_extent;
+ int cont_offset;
+ int cont_loops;
+ struct inode *inode;
+};
+
+/*
+ * This is a way of ensuring that we have something in the system
+ * use fields that is compatible with Rock Ridge. Return zero on success.
+ */
+
+static int check_sp(struct rock_ridge *rr, struct inode *inode)
+{
+ if (rr->u.SP.magic[0] != 0xbe)
+ return -1;
+ if (rr->u.SP.magic[1] != 0xef)
+ return -1;
+ ISOFS_SB(inode->i_sb)->s_rock_offset = rr->u.SP.skip;
+ return 0;
+}
+
+static void setup_rock_ridge(struct iso_directory_record *de,
+ struct inode *inode, struct rock_state *rs)
+{
+ rs->len = sizeof(struct iso_directory_record) + de->name_len[0];
+ if (rs->len & 1)
+ (rs->len)++;
+ rs->chr = (unsigned char *)de + rs->len;
+ rs->len = *((unsigned char *)de) - rs->len;
+ if (rs->len < 0)
+ rs->len = 0;
+
+ if (ISOFS_SB(inode->i_sb)->s_rock_offset != -1) {
+ rs->len -= ISOFS_SB(inode->i_sb)->s_rock_offset;
+ rs->chr += ISOFS_SB(inode->i_sb)->s_rock_offset;
+ if (rs->len < 0)
+ rs->len = 0;
+ }
+}
+
+static void init_rock_state(struct rock_state *rs, struct inode *inode)
+{
+ memset(rs, 0, sizeof(*rs));
+ rs->inode = inode;
+}
+
+/* Maximum number of Rock Ridge continuation entries */
+#define RR_MAX_CE_ENTRIES 32
+
+/*
+ * Returns 0 if the caller should continue scanning, 1 if the scan must end
+ * and -ve on error.
+ */
+static int rock_continue(struct rock_state *rs)
+{
+ int ret = 1;
+ int blocksize = 1 << rs->inode->i_blkbits;
+ const int min_de_size = offsetof(struct rock_ridge, u);
+
+ kfree(rs->buffer);
+ rs->buffer = NULL;
+
+ if ((unsigned)rs->cont_offset > blocksize - min_de_size ||
+ (unsigned)rs->cont_size > blocksize ||
+ (unsigned)(rs->cont_offset + rs->cont_size) > blocksize) {
+ printk(KERN_NOTICE "rock: corrupted directory entry. "
+ "extent=%d, offset=%d, size=%d\n",
+ rs->cont_extent, rs->cont_offset, rs->cont_size);
+ ret = -EIO;
+ goto out;
+ }
+
+ if (rs->cont_extent) {
+ struct buffer_head *bh;
+
+ rs->buffer = kmalloc(rs->cont_size, GFP_KERNEL);
+ if (!rs->buffer) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ ret = -EIO;
+ if (++rs->cont_loops >= RR_MAX_CE_ENTRIES)
+ goto out;
+ bh = sb_bread(rs->inode->i_sb, rs->cont_extent);
+ if (bh) {
+ memcpy(rs->buffer, bh->b_data + rs->cont_offset,
+ rs->cont_size);
+ put_bh(bh);
+ rs->chr = rs->buffer;
+ rs->len = rs->cont_size;
+ rs->cont_extent = 0;
+ rs->cont_size = 0;
+ rs->cont_offset = 0;
+ return 0;
+ }
+ printk("Unable to read rock-ridge attributes\n");
+ }
+out:
+ kfree(rs->buffer);
+ rs->buffer = NULL;
+ return ret;
+}
+
+/*
+ * We think there's a record of type `sig' at rs->chr. Parse the signature
+ * and make sure that there's really room for a record of that type.
+ */
+static int rock_check_overflow(struct rock_state *rs, int sig)
+{
+ int len;
+
+ switch (sig) {
+ case SIG('S', 'P'):
+ len = sizeof(struct SU_SP_s);
+ break;
+ case SIG('C', 'E'):
+ len = sizeof(struct SU_CE_s);
+ break;
+ case SIG('E', 'R'):
+ len = sizeof(struct SU_ER_s);
+ break;
+ case SIG('R', 'R'):
+ len = sizeof(struct RR_RR_s);
+ break;
+ case SIG('P', 'X'):
+ len = sizeof(struct RR_PX_s);
+ break;
+ case SIG('P', 'N'):
+ len = sizeof(struct RR_PN_s);
+ break;
+ case SIG('S', 'L'):
+ len = sizeof(struct RR_SL_s);
+ break;
+ case SIG('N', 'M'):
+ len = sizeof(struct RR_NM_s);
+ break;
+ case SIG('C', 'L'):
+ len = sizeof(struct RR_CL_s);
+ break;
+ case SIG('P', 'L'):
+ len = sizeof(struct RR_PL_s);
+ break;
+ case SIG('T', 'F'):
+ len = sizeof(struct RR_TF_s);
+ break;
+ case SIG('Z', 'F'):
+ len = sizeof(struct RR_ZF_s);
+ break;
+ default:
+ len = 0;
+ break;
+ }
+ len += offsetof(struct rock_ridge, u);
+ if (len > rs->len) {
+ printk(KERN_NOTICE "rock: directory entry would overflow "
+ "storage\n");
+ printk(KERN_NOTICE "rock: sig=0x%02x, size=%d, remaining=%d\n",
+ sig, len, rs->len);
+ return -EIO;
+ }
+ return 0;
+}
+
+/*
+ * return length of name field; 0: not found, -1: to be ignored
+ */
+int get_rock_ridge_filename(struct iso_directory_record *de,
+ char *retname, struct inode *inode)
+{
+ struct rock_state rs;
+ struct rock_ridge *rr;
+ int sig;
+ int retnamlen = 0;
+ int truncate = 0;
+ int ret = 0;
+ char *p;
+ int len;
+
+ if (!ISOFS_SB(inode->i_sb)->s_rock)
+ return 0;
+ *retname = 0;
+
+ init_rock_state(&rs, inode);
+ setup_rock_ridge(de, inode, &rs);
+repeat:
+
+ while (rs.len > 2) { /* There may be one byte for padding somewhere */
+ rr = (struct rock_ridge *)rs.chr;
+ /*
+ * Ignore rock ridge info if rr->len is out of range, but
+ * don't return -EIO because that would make the file
+ * invisible.
+ */
+ if (rr->len < 3)
+ goto out; /* Something got screwed up here */
+ sig = isonum_721(rs.chr);
+ if (rock_check_overflow(&rs, sig))
+ goto eio;
+ rs.chr += rr->len;
+ rs.len -= rr->len;
+ /*
+ * As above, just ignore the rock ridge info if rr->len
+ * is bogus.
+ */
+ if (rs.len < 0)
+ goto out; /* Something got screwed up here */
+
+ switch (sig) {
+ case SIG('R', 'R'):
+ if ((rr->u.RR.flags[0] & RR_NM) == 0)
+ goto out;
+ break;
+ case SIG('S', 'P'):
+ if (check_sp(rr, inode))
+ goto out;
+ break;
+ case SIG('C', 'E'):
+ rs.cont_extent = isonum_733(rr->u.CE.extent);
+ rs.cont_offset = isonum_733(rr->u.CE.offset);
+ rs.cont_size = isonum_733(rr->u.CE.size);
+ break;
+ case SIG('N', 'M'):
+ if (truncate)
+ break;
+ if (rr->len < 5)
+ break;
+ /*
+ * If the flags are 2 or 4, this indicates '.' or '..'.
+ * We don't want to do anything with this, because it
+ * screws up the code that calls us. We don't really
+ * care anyways, since we can just use the non-RR
+ * name.
+ */
+ if (rr->u.NM.flags & 6)
+ break;
+
+ if (rr->u.NM.flags & ~1) {
+ printk("Unsupported NM flag settings (%d)\n",
+ rr->u.NM.flags);
+ break;
+ }
+ len = rr->len - 5;
+ if (retnamlen + len >= 254) {
+ truncate = 1;
+ break;
+ }
+ p = memchr(rr->u.NM.name, '\0', len);
+ if (unlikely(p))
+ len = p - rr->u.NM.name;
+ memcpy(retname + retnamlen, rr->u.NM.name, len);
+ retnamlen += len;
+ retname[retnamlen] = '\0';
+ break;
+ case SIG('R', 'E'):
+ kfree(rs.buffer);
+ return -1;
+ default:
+ break;
+ }
+ }
+ ret = rock_continue(&rs);
+ if (ret == 0)
+ goto repeat;
+ if (ret == 1)
+ return retnamlen; /* If 0, this file did not have a NM field */
+out:
+ kfree(rs.buffer);
+ return ret;
+eio:
+ ret = -EIO;
+ goto out;
+}
+
+#define RR_REGARD_XA 1
+#define RR_RELOC_DE 2
+
+static int
+parse_rock_ridge_inode_internal(struct iso_directory_record *de,
+ struct inode *inode, int flags)
+{
+ int symlink_len = 0;
+ int cnt, sig;
+ unsigned int reloc_block;
+ struct inode *reloc;
+ struct rock_ridge *rr;
+ int rootflag;
+ struct rock_state rs;
+ int ret = 0;
+
+ if (!ISOFS_SB(inode->i_sb)->s_rock)
+ return 0;
+
+ init_rock_state(&rs, inode);
+ setup_rock_ridge(de, inode, &rs);
+ if (flags & RR_REGARD_XA) {
+ rs.chr += 14;
+ rs.len -= 14;
+ if (rs.len < 0)
+ rs.len = 0;
+ }
+
+repeat:
+ while (rs.len > 2) { /* There may be one byte for padding somewhere */
+ rr = (struct rock_ridge *)rs.chr;
+ /*
+ * Ignore rock ridge info if rr->len is out of range, but
+ * don't return -EIO because that would make the file
+ * invisible.
+ */
+ if (rr->len < 3)
+ goto out; /* Something got screwed up here */
+ sig = isonum_721(rs.chr);
+ if (rock_check_overflow(&rs, sig))
+ goto eio;
+ rs.chr += rr->len;
+ rs.len -= rr->len;
+ /*
+ * As above, just ignore the rock ridge info if rr->len
+ * is bogus.
+ */
+ if (rs.len < 0)
+ goto out; /* Something got screwed up here */
+
+ switch (sig) {
+#ifndef CONFIG_ZISOFS /* No flag for SF or ZF */
+ case SIG('R', 'R'):
+ if ((rr->u.RR.flags[0] &
+ (RR_PX | RR_TF | RR_SL | RR_CL)) == 0)
+ goto out;
+ break;
+#endif
+ case SIG('S', 'P'):
+ if (check_sp(rr, inode))
+ goto out;
+ break;
+ case SIG('C', 'E'):
+ rs.cont_extent = isonum_733(rr->u.CE.extent);
+ rs.cont_offset = isonum_733(rr->u.CE.offset);
+ rs.cont_size = isonum_733(rr->u.CE.size);
+ break;
+ case SIG('E', 'R'):
+ /* Invalid length of ER tag id? */
+ if (rr->u.ER.len_id + offsetof(struct rock_ridge, u.ER.data) > rr->len)
+ goto out;
+ ISOFS_SB(inode->i_sb)->s_rock = 1;
+ printk(KERN_DEBUG "ISO 9660 Extensions: ");
+ {
+ int p;
+ for (p = 0; p < rr->u.ER.len_id; p++)
+ printk(KERN_CONT "%c", rr->u.ER.data[p]);
+ }
+ printk(KERN_CONT "\n");
+ break;
+ case SIG('P', 'X'):
+ inode->i_mode = isonum_733(rr->u.PX.mode);
+ set_nlink(inode, isonum_733(rr->u.PX.n_links));
+ i_uid_write(inode, isonum_733(rr->u.PX.uid));
+ i_gid_write(inode, isonum_733(rr->u.PX.gid));
+ break;
+ case SIG('P', 'N'):
+ {
+ int high, low;
+ high = isonum_733(rr->u.PN.dev_high);
+ low = isonum_733(rr->u.PN.dev_low);
+ /*
+ * The Rock Ridge standard specifies that if
+ * sizeof(dev_t) <= 4, then the high field is
+ * unused, and the device number is completely
+ * stored in the low field. Some writers may
+ * ignore this subtlety,
+ * and as a result we test to see if the entire
+ * device number is
+ * stored in the low field, and use that.
+ */
+ if ((low & ~0xff) && high == 0) {
+ inode->i_rdev =
+ MKDEV(low >> 8, low & 0xff);
+ } else {
+ inode->i_rdev =
+ MKDEV(high, low);
+ }
+ }
+ break;
+ case SIG('T', 'F'):
+ /*
+ * Some RRIP writers incorrectly place ctime in the
+ * TF_CREATE field. Try to handle this correctly for
+ * either case.
+ */
+ /* Rock ridge never appears on a High Sierra disk */
+ cnt = 0;
+ if (rr->u.TF.flags & TF_CREATE) {
+ inode->i_ctime.tv_sec =
+ iso_date(rr->u.TF.times[cnt++].time,
+ 0);
+ inode->i_ctime.tv_nsec = 0;
+ }
+ if (rr->u.TF.flags & TF_MODIFY) {
+ inode->i_mtime.tv_sec =
+ iso_date(rr->u.TF.times[cnt++].time,
+ 0);
+ inode->i_mtime.tv_nsec = 0;
+ }
+ if (rr->u.TF.flags & TF_ACCESS) {
+ inode->i_atime.tv_sec =
+ iso_date(rr->u.TF.times[cnt++].time,
+ 0);
+ inode->i_atime.tv_nsec = 0;
+ }
+ if (rr->u.TF.flags & TF_ATTRIBUTES) {
+ inode->i_ctime.tv_sec =
+ iso_date(rr->u.TF.times[cnt++].time,
+ 0);
+ inode->i_ctime.tv_nsec = 0;
+ }
+ break;
+ case SIG('S', 'L'):
+ {
+ int slen;
+ struct SL_component *slp;
+ struct SL_component *oldslp;
+ slen = rr->len - 5;
+ slp = &rr->u.SL.link;
+ inode->i_size = symlink_len;
+ while (slen > 1) {
+ rootflag = 0;
+ switch (slp->flags & ~1) {
+ case 0:
+ inode->i_size +=
+ slp->len;
+ break;
+ case 2:
+ inode->i_size += 1;
+ break;
+ case 4:
+ inode->i_size += 2;
+ break;
+ case 8:
+ rootflag = 1;
+ inode->i_size += 1;
+ break;
+ default:
+ printk("Symlink component flag "
+ "not implemented\n");
+ }
+ slen -= slp->len + 2;
+ oldslp = slp;
+ slp = (struct SL_component *)
+ (((char *)slp) + slp->len + 2);
+
+ if (slen < 2) {
+ if (((rr->u.SL.
+ flags & 1) != 0)
+ &&
+ ((oldslp->
+ flags & 1) == 0))
+ inode->i_size +=
+ 1;
+ break;
+ }
+
+ /*
+ * If this component record isn't
+ * continued, then append a '/'.
+ */
+ if (!rootflag
+ && (oldslp->flags & 1) == 0)
+ inode->i_size += 1;
+ }
+ }
+ symlink_len = inode->i_size;
+ break;
+ case SIG('R', 'E'):
+ printk(KERN_WARNING "Attempt to read inode for "
+ "relocated directory\n");
+ goto out;
+ case SIG('C', 'L'):
+ if (flags & RR_RELOC_DE) {
+ printk(KERN_ERR
+ "ISOFS: Recursive directory relocation "
+ "is not supported\n");
+ goto eio;
+ }
+ reloc_block = isonum_733(rr->u.CL.location);
+ if (reloc_block == ISOFS_I(inode)->i_iget5_block &&
+ ISOFS_I(inode)->i_iget5_offset == 0) {
+ printk(KERN_ERR
+ "ISOFS: Directory relocation points to "
+ "itself\n");
+ goto eio;
+ }
+ ISOFS_I(inode)->i_first_extent = reloc_block;
+ reloc = isofs_iget_reloc(inode->i_sb, reloc_block, 0);
+ if (IS_ERR(reloc)) {
+ ret = PTR_ERR(reloc);
+ goto out;
+ }
+ inode->i_mode = reloc->i_mode;
+ set_nlink(inode, reloc->i_nlink);
+ inode->i_uid = reloc->i_uid;
+ inode->i_gid = reloc->i_gid;
+ inode->i_rdev = reloc->i_rdev;
+ inode->i_size = reloc->i_size;
+ inode->i_blocks = reloc->i_blocks;
+ inode->i_atime = reloc->i_atime;
+ inode->i_ctime = reloc->i_ctime;
+ inode->i_mtime = reloc->i_mtime;
+ iput(reloc);
+ break;
+#ifdef CONFIG_ZISOFS
+ case SIG('Z', 'F'): {
+ int algo;
+
+ if (ISOFS_SB(inode->i_sb)->s_nocompress)
+ break;
+ algo = isonum_721(rr->u.ZF.algorithm);
+ if (algo == SIG('p', 'z')) {
+ int block_shift =
+ isonum_711(&rr->u.ZF.parms[1]);
+ if (block_shift > 17) {
+ printk(KERN_WARNING "isofs: "
+ "Can't handle ZF block "
+ "size of 2^%d\n",
+ block_shift);
+ } else {
+ /*
+ * Note: we don't change
+ * i_blocks here
+ */
+ ISOFS_I(inode)->i_file_format =
+ isofs_file_compressed;
+ /*
+ * Parameters to compression
+ * algorithm (header size,
+ * block size)
+ */
+ ISOFS_I(inode)->i_format_parm[0] =
+ isonum_711(&rr->u.ZF.parms[0]);
+ ISOFS_I(inode)->i_format_parm[1] =
+ isonum_711(&rr->u.ZF.parms[1]);
+ inode->i_size =
+ isonum_733(rr->u.ZF.
+ real_size);
+ }
+ } else {
+ printk(KERN_WARNING
+ "isofs: Unknown ZF compression "
+ "algorithm: %c%c\n",
+ rr->u.ZF.algorithm[0],
+ rr->u.ZF.algorithm[1]);
+ }
+ break;
+ }
+#endif
+ default:
+ break;
+ }
+ }
+ ret = rock_continue(&rs);
+ if (ret == 0)
+ goto repeat;
+ if (ret == 1)
+ ret = 0;
+out:
+ kfree(rs.buffer);
+ return ret;
+eio:
+ ret = -EIO;
+ goto out;
+}
+
+static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit)
+{
+ int slen;
+ int rootflag;
+ struct SL_component *oldslp;
+ struct SL_component *slp;
+ slen = rr->len - 5;
+ slp = &rr->u.SL.link;
+ while (slen > 1) {
+ rootflag = 0;
+ switch (slp->flags & ~1) {
+ case 0:
+ if (slp->len > plimit - rpnt)
+ return NULL;
+ memcpy(rpnt, slp->text, slp->len);
+ rpnt += slp->len;
+ break;
+ case 2:
+ if (rpnt >= plimit)
+ return NULL;
+ *rpnt++ = '.';
+ break;
+ case 4:
+ if (2 > plimit - rpnt)
+ return NULL;
+ *rpnt++ = '.';
+ *rpnt++ = '.';
+ break;
+ case 8:
+ if (rpnt >= plimit)
+ return NULL;
+ rootflag = 1;
+ *rpnt++ = '/';
+ break;
+ default:
+ printk("Symlink component flag not implemented (%d)\n",
+ slp->flags);
+ }
+ slen -= slp->len + 2;
+ oldslp = slp;
+ slp = (struct SL_component *)((char *)slp + slp->len + 2);
+
+ if (slen < 2) {
+ /*
+ * If there is another SL record, and this component
+ * record isn't continued, then add a slash.
+ */
+ if ((!rootflag) && (rr->u.SL.flags & 1) &&
+ !(oldslp->flags & 1)) {
+ if (rpnt >= plimit)
+ return NULL;
+ *rpnt++ = '/';
+ }
+ break;
+ }
+
+ /*
+ * If this component record isn't continued, then append a '/'.
+ */
+ if (!rootflag && !(oldslp->flags & 1)) {
+ if (rpnt >= plimit)
+ return NULL;
+ *rpnt++ = '/';
+ }
+ }
+ return rpnt;
+}
+
+int parse_rock_ridge_inode(struct iso_directory_record *de, struct inode *inode,
+ int relocated)
+{
+ int flags = relocated ? RR_RELOC_DE : 0;
+ int result = parse_rock_ridge_inode_internal(de, inode, flags);
+
+ /*
+ * if rockridge flag was reset and we didn't look for attributes
+ * behind eventual XA attributes, have a look there
+ */
+ if ((ISOFS_SB(inode->i_sb)->s_rock_offset == -1)
+ && (ISOFS_SB(inode->i_sb)->s_rock == 2)) {
+ result = parse_rock_ridge_inode_internal(de, inode,
+ flags | RR_REGARD_XA);
+ }
+ return result;
+}
+
+/*
+ * read_folio() for symlinks: reads symlink contents into the folio and either
+ * makes it uptodate and returns 0 or returns error (-EIO)
+ */
+static int rock_ridge_symlink_read_folio(struct file *file, struct folio *folio)
+{
+ struct page *page = &folio->page;
+ struct inode *inode = page->mapping->host;
+ struct iso_inode_info *ei = ISOFS_I(inode);
+ struct isofs_sb_info *sbi = ISOFS_SB(inode->i_sb);
+ char *link = page_address(page);
+ unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
+ struct buffer_head *bh;
+ char *rpnt = link;
+ unsigned char *pnt;
+ struct iso_directory_record *raw_de;
+ unsigned long block, offset;
+ int sig;
+ struct rock_ridge *rr;
+ struct rock_state rs;
+ int ret;
+
+ if (!sbi->s_rock)
+ goto error;
+
+ init_rock_state(&rs, inode);
+ block = ei->i_iget5_block;
+ bh = sb_bread(inode->i_sb, block);
+ if (!bh)
+ goto out_noread;
+
+ offset = ei->i_iget5_offset;
+ pnt = (unsigned char *)bh->b_data + offset;
+
+ raw_de = (struct iso_directory_record *)pnt;
+
+ /*
+ * If we go past the end of the buffer, there is some sort of error.
+ */
+ if (offset + *pnt > bufsize)
+ goto out_bad_span;
+
+ /*
+ * Now test for possible Rock Ridge extensions which will override
+ * some of these numbers in the inode structure.
+ */
+
+ setup_rock_ridge(raw_de, inode, &rs);
+
+repeat:
+ while (rs.len > 2) { /* There may be one byte for padding somewhere */
+ rr = (struct rock_ridge *)rs.chr;
+ if (rr->len < 3)
+ goto out; /* Something got screwed up here */
+ sig = isonum_721(rs.chr);
+ if (rock_check_overflow(&rs, sig))
+ goto out;
+ rs.chr += rr->len;
+ rs.len -= rr->len;
+ if (rs.len < 0)
+ goto out; /* corrupted isofs */
+
+ switch (sig) {
+ case SIG('R', 'R'):
+ if ((rr->u.RR.flags[0] & RR_SL) == 0)
+ goto out;
+ break;
+ case SIG('S', 'P'):
+ if (check_sp(rr, inode))
+ goto out;
+ break;
+ case SIG('S', 'L'):
+ rpnt = get_symlink_chunk(rpnt, rr,
+ link + (PAGE_SIZE - 1));
+ if (rpnt == NULL)
+ goto out;
+ break;
+ case SIG('C', 'E'):
+ /* This tells is if there is a continuation record */
+ rs.cont_extent = isonum_733(rr->u.CE.extent);
+ rs.cont_offset = isonum_733(rr->u.CE.offset);
+ rs.cont_size = isonum_733(rr->u.CE.size);
+ break;
+ default:
+ break;
+ }
+ }
+ ret = rock_continue(&rs);
+ if (ret == 0)
+ goto repeat;
+ if (ret < 0)
+ goto fail;
+
+ if (rpnt == link)
+ goto fail;
+ brelse(bh);
+ *rpnt = '\0';
+ SetPageUptodate(page);
+ unlock_page(page);
+ return 0;
+
+ /* error exit from macro */
+out:
+ kfree(rs.buffer);
+ goto fail;
+out_noread:
+ printk("unable to read i-node block");
+ goto fail;
+out_bad_span:
+ printk("symlink spans iso9660 blocks\n");
+fail:
+ brelse(bh);
+error:
+ SetPageError(page);
+ unlock_page(page);
+ return -EIO;
+}
+
+const struct address_space_operations isofs_symlink_aops = {
+ .read_folio = rock_ridge_symlink_read_folio
+};
diff --git a/fs/isofs/rock.h b/fs/isofs/rock.h
new file mode 100644
index 000000000..ee9660e96
--- /dev/null
+++ b/fs/isofs/rock.h
@@ -0,0 +1,123 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * These structs are used by the system-use-sharing protocol, in which the
+ * Rock Ridge extensions are embedded. It is quite possible that other
+ * extensions are present on the disk, and this is fine as long as they
+ * all use SUSP
+ */
+
+struct SU_SP_s {
+ __u8 magic[2];
+ __u8 skip;
+} __attribute__ ((packed));
+
+struct SU_CE_s {
+ __u8 extent[8];
+ __u8 offset[8];
+ __u8 size[8];
+};
+
+struct SU_ER_s {
+ __u8 len_id;
+ __u8 len_des;
+ __u8 len_src;
+ __u8 ext_ver;
+ __u8 data[];
+} __attribute__ ((packed));
+
+struct RR_RR_s {
+ __u8 flags[1];
+} __attribute__ ((packed));
+
+struct RR_PX_s {
+ __u8 mode[8];
+ __u8 n_links[8];
+ __u8 uid[8];
+ __u8 gid[8];
+};
+
+struct RR_PN_s {
+ __u8 dev_high[8];
+ __u8 dev_low[8];
+};
+
+struct SL_component {
+ __u8 flags;
+ __u8 len;
+ __u8 text[];
+} __attribute__ ((packed));
+
+struct RR_SL_s {
+ __u8 flags;
+ struct SL_component link;
+} __attribute__ ((packed));
+
+struct RR_NM_s {
+ __u8 flags;
+ char name[];
+} __attribute__ ((packed));
+
+struct RR_CL_s {
+ __u8 location[8];
+};
+
+struct RR_PL_s {
+ __u8 location[8];
+};
+
+struct stamp {
+ __u8 time[7]; /* actually 6 unsigned, 1 signed */
+} __attribute__ ((packed));
+
+struct RR_TF_s {
+ __u8 flags;
+ struct stamp times[]; /* Variable number of these beasts */
+} __attribute__ ((packed));
+
+/* Linux-specific extension for transparent decompression */
+struct RR_ZF_s {
+ __u8 algorithm[2];
+ __u8 parms[2];
+ __u8 real_size[8];
+};
+
+/*
+ * These are the bits and their meanings for flags in the TF structure.
+ */
+#define TF_CREATE 1
+#define TF_MODIFY 2
+#define TF_ACCESS 4
+#define TF_ATTRIBUTES 8
+#define TF_BACKUP 16
+#define TF_EXPIRATION 32
+#define TF_EFFECTIVE 64
+#define TF_LONG_FORM 128
+
+struct rock_ridge {
+ __u8 signature[2];
+ __u8 len;
+ __u8 version;
+ union {
+ struct SU_SP_s SP;
+ struct SU_CE_s CE;
+ struct SU_ER_s ER;
+ struct RR_RR_s RR;
+ struct RR_PX_s PX;
+ struct RR_PN_s PN;
+ struct RR_SL_s SL;
+ struct RR_NM_s NM;
+ struct RR_CL_s CL;
+ struct RR_PL_s PL;
+ struct RR_TF_s TF;
+ struct RR_ZF_s ZF;
+ } u;
+};
+
+#define RR_PX 1 /* POSIX attributes */
+#define RR_PN 2 /* POSIX devices */
+#define RR_SL 4 /* Symbolic link */
+#define RR_NM 8 /* Alternate Name */
+#define RR_CL 16 /* Child link */
+#define RR_PL 32 /* Parent link */
+#define RR_RE 64 /* Relocation directory */
+#define RR_TF 128 /* Timestamps */
diff --git a/fs/isofs/util.c b/fs/isofs/util.c
new file mode 100644
index 000000000..e88dba721
--- /dev/null
+++ b/fs/isofs/util.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/isofs/util.c
+ */
+
+#include <linux/time.h>
+#include "isofs.h"
+
+/*
+ * We have to convert from a MM/DD/YY format to the Unix ctime format.
+ * We have to take into account leap years and all of that good stuff.
+ * Unfortunately, the kernel does not have the information on hand to
+ * take into account daylight savings time, but it shouldn't matter.
+ * The time stored should be localtime (with or without DST in effect),
+ * and the timezone offset should hold the offset required to get back
+ * to GMT. Thus we should always be correct.
+ */
+
+int iso_date(u8 *p, int flag)
+{
+ int year, month, day, hour, minute, second, tz;
+ int crtime;
+
+ year = p[0];
+ month = p[1];
+ day = p[2];
+ hour = p[3];
+ minute = p[4];
+ second = p[5];
+ if (flag == 0) tz = p[6]; /* High sierra has no time zone */
+ else tz = 0;
+
+ if (year < 0) {
+ crtime = 0;
+ } else {
+ crtime = mktime64(year+1900, month, day, hour, minute, second);
+
+ /* sign extend */
+ if (tz & 0x80)
+ tz |= (-1 << 8);
+
+ /*
+ * The timezone offset is unreliable on some disks,
+ * so we make a sanity check. In no case is it ever
+ * more than 13 hours from GMT, which is 52*15min.
+ * The time is always stored in localtime with the
+ * timezone offset being what get added to GMT to
+ * get to localtime. Thus we need to subtract the offset
+ * to get to true GMT, which is what we store the time
+ * as internally. On the local system, the user may set
+ * their timezone any way they wish, of course, so GMT
+ * gets converted back to localtime on the receiving
+ * system.
+ *
+ * NOTE: mkisofs in versions prior to mkisofs-1.10 had
+ * the sign wrong on the timezone offset. This has now
+ * been corrected there too, but if you are getting screwy
+ * results this may be the explanation. If enough people
+ * complain, a user configuration option could be added
+ * to add the timezone offset in with the wrong sign
+ * for 'compatibility' with older discs, but I cannot see how
+ * it will matter that much.
+ *
+ * Thanks to kuhlmav@elec.canterbury.ac.nz (Volker Kuhlmann)
+ * for pointing out the sign error.
+ */
+ if (-52 <= tz && tz <= 52)
+ crtime -= tz * 15 * 60;
+ }
+ return crtime;
+}
diff --git a/fs/isofs/zisofs.h b/fs/isofs/zisofs.h
new file mode 100644
index 000000000..70f1a218f
--- /dev/null
+++ b/fs/isofs/zisofs.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* ----------------------------------------------------------------------- *
+ *
+ * Copyright 2001 H. Peter Anvin - All Rights Reserved
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * Prototypes for functions exported from the compressed isofs subsystem
+ */
+
+#ifdef CONFIG_ZISOFS
+extern const struct address_space_operations zisofs_aops;
+extern int __init zisofs_init(void);
+extern void zisofs_cleanup(void);
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-04 11:32:26 +0000