v4.19.13 snapshot.
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
new file mode 100644
index 0000000..5df554a
--- /dev/null
+++ b/fs/udf/inode.c
@@ -0,0 +1,2304 @@
+/*
+ * inode.c
+ *
+ * PURPOSE
+ * Inode handling routines for the OSTA-UDF(tm) filesystem.
+ *
+ * COPYRIGHT
+ * This file is distributed under the terms of the GNU General Public
+ * License (GPL). Copies of the GPL can be obtained from:
+ * ftp://prep.ai.mit.edu/pub/gnu/GPL
+ * Each contributing author retains all rights to their own work.
+ *
+ * (C) 1998 Dave Boynton
+ * (C) 1998-2004 Ben Fennema
+ * (C) 1999-2000 Stelias Computing Inc
+ *
+ * HISTORY
+ *
+ * 10/04/98 dgb Added rudimentary directory functions
+ * 10/07/98 Fully working udf_block_map! It works!
+ * 11/25/98 bmap altered to better support extents
+ * 12/06/98 blf partition support in udf_iget, udf_block_map
+ * and udf_read_inode
+ * 12/12/98 rewrote udf_block_map to handle next extents and descs across
+ * block boundaries (which is not actually allowed)
+ * 12/20/98 added support for strategy 4096
+ * 03/07/99 rewrote udf_block_map (again)
+ * New funcs, inode_bmap, udf_next_aext
+ * 04/19/99 Support for writing device EA's for major/minor #
+ */
+
+#include "udfdecl.h"
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/pagemap.h>
+#include <linux/writeback.h>
+#include <linux/slab.h>
+#include <linux/crc-itu-t.h>
+#include <linux/mpage.h>
+#include <linux/uio.h>
+#include <linux/bio.h>
+
+#include "udf_i.h"
+#include "udf_sb.h"
+
+#define EXTENT_MERGE_SIZE 5
+
+static umode_t udf_convert_permissions(struct fileEntry *);
+static int udf_update_inode(struct inode *, int);
+static int udf_sync_inode(struct inode *inode);
+static int udf_alloc_i_data(struct inode *inode, size_t size);
+static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
+static int8_t udf_insert_aext(struct inode *, struct extent_position,
+ struct kernel_lb_addr, uint32_t);
+static void udf_split_extents(struct inode *, int *, int, udf_pblk_t,
+ struct kernel_long_ad *, int *);
+static void udf_prealloc_extents(struct inode *, int, int,
+ struct kernel_long_ad *, int *);
+static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
+static void udf_update_extents(struct inode *, struct kernel_long_ad *, int,
+ int, struct extent_position *);
+static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
+
+static void __udf_clear_extent_cache(struct inode *inode)
+{
+ struct udf_inode_info *iinfo = UDF_I(inode);
+
+ if (iinfo->cached_extent.lstart != -1) {
+ brelse(iinfo->cached_extent.epos.bh);
+ iinfo->cached_extent.lstart = -1;
+ }
+}
+
+/* Invalidate extent cache */
+static void udf_clear_extent_cache(struct inode *inode)
+{
+ struct udf_inode_info *iinfo = UDF_I(inode);
+
+ spin_lock(&iinfo->i_extent_cache_lock);
+ __udf_clear_extent_cache(inode);
+ spin_unlock(&iinfo->i_extent_cache_lock);
+}
+
+/* Return contents of extent cache */
+static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
+ loff_t *lbcount, struct extent_position *pos)
+{
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ int ret = 0;
+
+ spin_lock(&iinfo->i_extent_cache_lock);
+ if ((iinfo->cached_extent.lstart <= bcount) &&
+ (iinfo->cached_extent.lstart != -1)) {
+ /* Cache hit */
+ *lbcount = iinfo->cached_extent.lstart;
+ memcpy(pos, &iinfo->cached_extent.epos,
+ sizeof(struct extent_position));
+ if (pos->bh)
+ get_bh(pos->bh);
+ ret = 1;
+ }
+ spin_unlock(&iinfo->i_extent_cache_lock);
+ return ret;
+}
+
+/* Add extent to extent cache */
+static void udf_update_extent_cache(struct inode *inode, loff_t estart,
+ struct extent_position *pos)
+{
+ struct udf_inode_info *iinfo = UDF_I(inode);
+
+ spin_lock(&iinfo->i_extent_cache_lock);
+ /* Invalidate previously cached extent */
+ __udf_clear_extent_cache(inode);
+ if (pos->bh)
+ get_bh(pos->bh);
+ memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
+ iinfo->cached_extent.lstart = estart;
+ switch (iinfo->i_alloc_type) {
+ case ICBTAG_FLAG_AD_SHORT:
+ iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
+ break;
+ case ICBTAG_FLAG_AD_LONG:
+ iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
+ break;
+ }
+ spin_unlock(&iinfo->i_extent_cache_lock);
+}
+
+void udf_evict_inode(struct inode *inode)
+{
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ int want_delete = 0;
+
+ if (!inode->i_nlink && !is_bad_inode(inode)) {
+ want_delete = 1;
+ udf_setsize(inode, 0);
+ udf_update_inode(inode, IS_SYNC(inode));
+ }
+ truncate_inode_pages_final(&inode->i_data);
+ invalidate_inode_buffers(inode);
+ clear_inode(inode);
+ if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
+ inode->i_size != iinfo->i_lenExtents) {
+ udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
+ inode->i_ino, inode->i_mode,
+ (unsigned long long)inode->i_size,
+ (unsigned long long)iinfo->i_lenExtents);
+ }
+ kfree(iinfo->i_ext.i_data);
+ iinfo->i_ext.i_data = NULL;
+ udf_clear_extent_cache(inode);
+ if (want_delete) {
+ udf_free_inode(inode);
+ }
+}
+
+static void udf_write_failed(struct address_space *mapping, loff_t to)
+{
+ struct inode *inode = mapping->host;
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ loff_t isize = inode->i_size;
+
+ if (to > isize) {
+ truncate_pagecache(inode, isize);
+ if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
+ down_write(&iinfo->i_data_sem);
+ udf_clear_extent_cache(inode);
+ udf_truncate_extents(inode);
+ up_write(&iinfo->i_data_sem);
+ }
+ }
+}
+
+static int udf_writepage(struct page *page, struct writeback_control *wbc)
+{
+ return block_write_full_page(page, udf_get_block, wbc);
+}
+
+static int udf_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ return mpage_writepages(mapping, wbc, udf_get_block);
+}
+
+static int udf_readpage(struct file *file, struct page *page)
+{
+ return mpage_readpage(page, udf_get_block);
+}
+
+static int udf_readpages(struct file *file, struct address_space *mapping,
+ struct list_head *pages, unsigned nr_pages)
+{
+ return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
+}
+
+static int udf_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
+{
+ int ret;
+
+ ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
+ if (unlikely(ret))
+ udf_write_failed(mapping, pos + len);
+ return ret;
+}
+
+static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
+{
+ struct file *file = iocb->ki_filp;
+ struct address_space *mapping = file->f_mapping;
+ struct inode *inode = mapping->host;
+ size_t count = iov_iter_count(iter);
+ ssize_t ret;
+
+ ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
+ if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
+ udf_write_failed(mapping, iocb->ki_pos + count);
+ return ret;
+}
+
+static sector_t udf_bmap(struct address_space *mapping, sector_t block)
+{
+ return generic_block_bmap(mapping, block, udf_get_block);
+}
+
+const struct address_space_operations udf_aops = {
+ .readpage = udf_readpage,
+ .readpages = udf_readpages,
+ .writepage = udf_writepage,
+ .writepages = udf_writepages,
+ .write_begin = udf_write_begin,
+ .write_end = generic_write_end,
+ .direct_IO = udf_direct_IO,
+ .bmap = udf_bmap,
+};
+
+/*
+ * Expand file stored in ICB to a normal one-block-file
+ *
+ * This function requires i_data_sem for writing and releases it.
+ * This function requires i_mutex held
+ */
+int udf_expand_file_adinicb(struct inode *inode)
+{
+ struct page *page;
+ char *kaddr;
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ int err;
+ struct writeback_control udf_wbc = {
+ .sync_mode = WB_SYNC_NONE,
+ .nr_to_write = 1,
+ };
+
+ WARN_ON_ONCE(!inode_is_locked(inode));
+ if (!iinfo->i_lenAlloc) {
+ if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
+ iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
+ else
+ iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
+ /* from now on we have normal address_space methods */
+ inode->i_data.a_ops = &udf_aops;
+ up_write(&iinfo->i_data_sem);
+ mark_inode_dirty(inode);
+ return 0;
+ }
+ /*
+ * Release i_data_sem so that we can lock a page - page lock ranks
+ * above i_data_sem. i_mutex still protects us against file changes.
+ */
+ up_write(&iinfo->i_data_sem);
+
+ page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
+ if (!page)
+ return -ENOMEM;
+
+ if (!PageUptodate(page)) {
+ kaddr = kmap_atomic(page);
+ memset(kaddr + iinfo->i_lenAlloc, 0x00,
+ PAGE_SIZE - iinfo->i_lenAlloc);
+ memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
+ iinfo->i_lenAlloc);
+ flush_dcache_page(page);
+ SetPageUptodate(page);
+ kunmap_atomic(kaddr);
+ }
+ down_write(&iinfo->i_data_sem);
+ memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
+ iinfo->i_lenAlloc);
+ iinfo->i_lenAlloc = 0;
+ if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
+ iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
+ else
+ iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
+ /* from now on we have normal address_space methods */
+ inode->i_data.a_ops = &udf_aops;
+ up_write(&iinfo->i_data_sem);
+ err = inode->i_data.a_ops->writepage(page, &udf_wbc);
+ if (err) {
+ /* Restore everything back so that we don't lose data... */
+ lock_page(page);
+ down_write(&iinfo->i_data_sem);
+ kaddr = kmap_atomic(page);
+ memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
+ inode->i_size);
+ kunmap_atomic(kaddr);
+ unlock_page(page);
+ iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
+ inode->i_data.a_ops = &udf_adinicb_aops;
+ up_write(&iinfo->i_data_sem);
+ }
+ put_page(page);
+ mark_inode_dirty(inode);
+
+ return err;
+}
+
+struct buffer_head *udf_expand_dir_adinicb(struct inode *inode,
+ udf_pblk_t *block, int *err)
+{
+ udf_pblk_t newblock;
+ struct buffer_head *dbh = NULL;
+ struct kernel_lb_addr eloc;
+ uint8_t alloctype;
+ struct extent_position epos;
+
+ struct udf_fileident_bh sfibh, dfibh;
+ loff_t f_pos = udf_ext0_offset(inode);
+ int size = udf_ext0_offset(inode) + inode->i_size;
+ struct fileIdentDesc cfi, *sfi, *dfi;
+ struct udf_inode_info *iinfo = UDF_I(inode);
+
+ if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
+ alloctype = ICBTAG_FLAG_AD_SHORT;
+ else
+ alloctype = ICBTAG_FLAG_AD_LONG;
+
+ if (!inode->i_size) {
+ iinfo->i_alloc_type = alloctype;
+ mark_inode_dirty(inode);
+ return NULL;
+ }
+
+ /* alloc block, and copy data to it */
+ *block = udf_new_block(inode->i_sb, inode,
+ iinfo->i_location.partitionReferenceNum,
+ iinfo->i_location.logicalBlockNum, err);
+ if (!(*block))
+ return NULL;
+ newblock = udf_get_pblock(inode->i_sb, *block,
+ iinfo->i_location.partitionReferenceNum,
+ 0);
+ if (!newblock)
+ return NULL;
+ dbh = udf_tgetblk(inode->i_sb, newblock);
+ if (!dbh)
+ return NULL;
+ lock_buffer(dbh);
+ memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
+ set_buffer_uptodate(dbh);
+ unlock_buffer(dbh);
+ mark_buffer_dirty_inode(dbh, inode);
+
+ sfibh.soffset = sfibh.eoffset =
+ f_pos & (inode->i_sb->s_blocksize - 1);
+ sfibh.sbh = sfibh.ebh = NULL;
+ dfibh.soffset = dfibh.eoffset = 0;
+ dfibh.sbh = dfibh.ebh = dbh;
+ while (f_pos < size) {
+ iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
+ sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
+ NULL, NULL, NULL);
+ if (!sfi) {
+ brelse(dbh);
+ return NULL;
+ }
+ iinfo->i_alloc_type = alloctype;
+ sfi->descTag.tagLocation = cpu_to_le32(*block);
+ dfibh.soffset = dfibh.eoffset;
+ dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
+ dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
+ if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
+ sfi->fileIdent +
+ le16_to_cpu(sfi->lengthOfImpUse))) {
+ iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
+ brelse(dbh);
+ return NULL;
+ }
+ }
+ mark_buffer_dirty_inode(dbh, inode);
+
+ memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
+ iinfo->i_lenAlloc);
+ iinfo->i_lenAlloc = 0;
+ eloc.logicalBlockNum = *block;
+ eloc.partitionReferenceNum =
+ iinfo->i_location.partitionReferenceNum;
+ iinfo->i_lenExtents = inode->i_size;
+ epos.bh = NULL;
+ epos.block = iinfo->i_location;
+ epos.offset = udf_file_entry_alloc_offset(inode);
+ udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
+ /* UniqueID stuff */
+
+ brelse(epos.bh);
+ mark_inode_dirty(inode);
+ return dbh;
+}
+
+static int udf_get_block(struct inode *inode, sector_t block,
+ struct buffer_head *bh_result, int create)
+{
+ int err, new;
+ sector_t phys = 0;
+ struct udf_inode_info *iinfo;
+
+ if (!create) {
+ phys = udf_block_map(inode, block);
+ if (phys)
+ map_bh(bh_result, inode->i_sb, phys);
+ return 0;
+ }
+
+ err = -EIO;
+ new = 0;
+ iinfo = UDF_I(inode);
+
+ down_write(&iinfo->i_data_sem);
+ if (block == iinfo->i_next_alloc_block + 1) {
+ iinfo->i_next_alloc_block++;
+ iinfo->i_next_alloc_goal++;
+ }
+
+ udf_clear_extent_cache(inode);
+ phys = inode_getblk(inode, block, &err, &new);
+ if (!phys)
+ goto abort;
+
+ if (new)
+ set_buffer_new(bh_result);
+ map_bh(bh_result, inode->i_sb, phys);
+
+abort:
+ up_write(&iinfo->i_data_sem);
+ return err;
+}
+
+static struct buffer_head *udf_getblk(struct inode *inode, udf_pblk_t block,
+ int create, int *err)
+{
+ struct buffer_head *bh;
+ struct buffer_head dummy;
+
+ dummy.b_state = 0;
+ dummy.b_blocknr = -1000;
+ *err = udf_get_block(inode, block, &dummy, create);
+ if (!*err && buffer_mapped(&dummy)) {
+ bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
+ if (buffer_new(&dummy)) {
+ lock_buffer(bh);
+ memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
+ set_buffer_uptodate(bh);
+ unlock_buffer(bh);
+ mark_buffer_dirty_inode(bh, inode);
+ }
+ return bh;
+ }
+
+ return NULL;
+}
+
+/* Extend the file by 'blocks' blocks, return the number of extents added */
+static int udf_do_extend_file(struct inode *inode,
+ struct extent_position *last_pos,
+ struct kernel_long_ad *last_ext,
+ sector_t blocks)
+{
+ sector_t add;
+ int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
+ struct super_block *sb = inode->i_sb;
+ struct kernel_lb_addr prealloc_loc = {};
+ uint32_t prealloc_len = 0;
+ struct udf_inode_info *iinfo;
+ int err;
+
+ /* The previous extent is fake and we should not extend by anything
+ * - there's nothing to do... */
+ if (!blocks && fake)
+ return 0;
+
+ iinfo = UDF_I(inode);
+ /* Round the last extent up to a multiple of block size */
+ if (last_ext->extLength & (sb->s_blocksize - 1)) {
+ last_ext->extLength =
+ (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
+ (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
+ sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
+ iinfo->i_lenExtents =
+ (iinfo->i_lenExtents + sb->s_blocksize - 1) &
+ ~(sb->s_blocksize - 1);
+ }
+
+ /* Last extent are just preallocated blocks? */
+ if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
+ EXT_NOT_RECORDED_ALLOCATED) {
+ /* Save the extent so that we can reattach it to the end */
+ prealloc_loc = last_ext->extLocation;
+ prealloc_len = last_ext->extLength;
+ /* Mark the extent as a hole */
+ last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
+ (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
+ last_ext->extLocation.logicalBlockNum = 0;
+ last_ext->extLocation.partitionReferenceNum = 0;
+ }
+
+ /* Can we merge with the previous extent? */
+ if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
+ EXT_NOT_RECORDED_NOT_ALLOCATED) {
+ add = ((1 << 30) - sb->s_blocksize -
+ (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
+ sb->s_blocksize_bits;
+ if (add > blocks)
+ add = blocks;
+ blocks -= add;
+ last_ext->extLength += add << sb->s_blocksize_bits;
+ }
+
+ if (fake) {
+ udf_add_aext(inode, last_pos, &last_ext->extLocation,
+ last_ext->extLength, 1);
+ count++;
+ } else {
+ struct kernel_lb_addr tmploc;
+ uint32_t tmplen;
+
+ udf_write_aext(inode, last_pos, &last_ext->extLocation,
+ last_ext->extLength, 1);
+ /*
+ * We've rewritten the last extent but there may be empty
+ * indirect extent after it - enter it.
+ */
+ udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
+ }
+
+ /* Managed to do everything necessary? */
+ if (!blocks)
+ goto out;
+
+ /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
+ last_ext->extLocation.logicalBlockNum = 0;
+ last_ext->extLocation.partitionReferenceNum = 0;
+ add = (1 << (30-sb->s_blocksize_bits)) - 1;
+ last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
+ (add << sb->s_blocksize_bits);
+
+ /* Create enough extents to cover the whole hole */
+ while (blocks > add) {
+ blocks -= add;
+ err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
+ last_ext->extLength, 1);
+ if (err)
+ return err;
+ count++;
+ }
+ if (blocks) {
+ last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
+ (blocks << sb->s_blocksize_bits);
+ err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
+ last_ext->extLength, 1);
+ if (err)
+ return err;
+ count++;
+ }
+
+out:
+ /* Do we have some preallocated blocks saved? */
+ if (prealloc_len) {
+ err = udf_add_aext(inode, last_pos, &prealloc_loc,
+ prealloc_len, 1);
+ if (err)
+ return err;
+ last_ext->extLocation = prealloc_loc;
+ last_ext->extLength = prealloc_len;
+ count++;
+ }
+
+ /* last_pos should point to the last written extent... */
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+ last_pos->offset -= sizeof(struct short_ad);
+ else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+ last_pos->offset -= sizeof(struct long_ad);
+ else
+ return -EIO;
+
+ return count;
+}
+
+static int udf_extend_file(struct inode *inode, loff_t newsize)
+{
+
+ struct extent_position epos;
+ struct kernel_lb_addr eloc;
+ uint32_t elen;
+ int8_t etype;
+ struct super_block *sb = inode->i_sb;
+ sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
+ int adsize;
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ struct kernel_long_ad extent;
+ int err;
+
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+ adsize = sizeof(struct short_ad);
+ else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+ adsize = sizeof(struct long_ad);
+ else
+ BUG();
+
+ etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
+
+ /* File has extent covering the new size (could happen when extending
+ * inside a block)? */
+ if (etype != -1)
+ return 0;
+ if (newsize & (sb->s_blocksize - 1))
+ offset++;
+ /* Extended file just to the boundary of the last file block? */
+ if (offset == 0)
+ return 0;
+
+ /* Truncate is extending the file by 'offset' blocks */
+ if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
+ (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
+ /* File has no extents at all or has empty last
+ * indirect extent! Create a fake extent... */
+ extent.extLocation.logicalBlockNum = 0;
+ extent.extLocation.partitionReferenceNum = 0;
+ extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
+ } else {
+ epos.offset -= adsize;
+ etype = udf_next_aext(inode, &epos, &extent.extLocation,
+ &extent.extLength, 0);
+ extent.extLength |= etype << 30;
+ }
+ err = udf_do_extend_file(inode, &epos, &extent, offset);
+ if (err < 0)
+ goto out;
+ err = 0;
+ iinfo->i_lenExtents = newsize;
+out:
+ brelse(epos.bh);
+ return err;
+}
+
+static sector_t inode_getblk(struct inode *inode, sector_t block,
+ int *err, int *new)
+{
+ struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
+ struct extent_position prev_epos, cur_epos, next_epos;
+ int count = 0, startnum = 0, endnum = 0;
+ uint32_t elen = 0, tmpelen;
+ struct kernel_lb_addr eloc, tmpeloc;
+ int c = 1;
+ loff_t lbcount = 0, b_off = 0;
+ udf_pblk_t newblocknum, newblock;
+ sector_t offset = 0;
+ int8_t etype;
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
+ int lastblock = 0;
+ bool isBeyondEOF;
+
+ *err = 0;
+ *new = 0;
+ prev_epos.offset = udf_file_entry_alloc_offset(inode);
+ prev_epos.block = iinfo->i_location;
+ prev_epos.bh = NULL;
+ cur_epos = next_epos = prev_epos;
+ b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
+
+ /* find the extent which contains the block we are looking for.
+ alternate between laarr[0] and laarr[1] for locations of the
+ current extent, and the previous extent */
+ do {
+ if (prev_epos.bh != cur_epos.bh) {
+ brelse(prev_epos.bh);
+ get_bh(cur_epos.bh);
+ prev_epos.bh = cur_epos.bh;
+ }
+ if (cur_epos.bh != next_epos.bh) {
+ brelse(cur_epos.bh);
+ get_bh(next_epos.bh);
+ cur_epos.bh = next_epos.bh;
+ }
+
+ lbcount += elen;
+
+ prev_epos.block = cur_epos.block;
+ cur_epos.block = next_epos.block;
+
+ prev_epos.offset = cur_epos.offset;
+ cur_epos.offset = next_epos.offset;
+
+ etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
+ if (etype == -1)
+ break;
+
+ c = !c;
+
+ laarr[c].extLength = (etype << 30) | elen;
+ laarr[c].extLocation = eloc;
+
+ if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
+ pgoal = eloc.logicalBlockNum +
+ ((elen + inode->i_sb->s_blocksize - 1) >>
+ inode->i_sb->s_blocksize_bits);
+
+ count++;
+ } while (lbcount + elen <= b_off);
+
+ b_off -= lbcount;
+ offset = b_off >> inode->i_sb->s_blocksize_bits;
+ /*
+ * Move prev_epos and cur_epos into indirect extent if we are at
+ * the pointer to it
+ */
+ udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
+ udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
+
+ /* if the extent is allocated and recorded, return the block
+ if the extent is not a multiple of the blocksize, round up */
+
+ if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
+ if (elen & (inode->i_sb->s_blocksize - 1)) {
+ elen = EXT_RECORDED_ALLOCATED |
+ ((elen + inode->i_sb->s_blocksize - 1) &
+ ~(inode->i_sb->s_blocksize - 1));
+ udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
+ }
+ newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
+ goto out_free;
+ }
+
+ /* Are we beyond EOF? */
+ if (etype == -1) {
+ int ret;
+ isBeyondEOF = true;
+ if (count) {
+ if (c)
+ laarr[0] = laarr[1];
+ startnum = 1;
+ } else {
+ /* Create a fake extent when there's not one */
+ memset(&laarr[0].extLocation, 0x00,
+ sizeof(struct kernel_lb_addr));
+ laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
+ /* Will udf_do_extend_file() create real extent from
+ a fake one? */
+ startnum = (offset > 0);
+ }
+ /* Create extents for the hole between EOF and offset */
+ ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
+ if (ret < 0) {
+ *err = ret;
+ newblock = 0;
+ goto out_free;
+ }
+ c = 0;
+ offset = 0;
+ count += ret;
+ /* We are not covered by a preallocated extent? */
+ if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
+ EXT_NOT_RECORDED_ALLOCATED) {
+ /* Is there any real extent? - otherwise we overwrite
+ * the fake one... */
+ if (count)
+ c = !c;
+ laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
+ inode->i_sb->s_blocksize;
+ memset(&laarr[c].extLocation, 0x00,
+ sizeof(struct kernel_lb_addr));
+ count++;
+ }
+ endnum = c + 1;
+ lastblock = 1;
+ } else {
+ isBeyondEOF = false;
+ endnum = startnum = ((count > 2) ? 2 : count);
+
+ /* if the current extent is in position 0,
+ swap it with the previous */
+ if (!c && count != 1) {
+ laarr[2] = laarr[0];
+ laarr[0] = laarr[1];
+ laarr[1] = laarr[2];
+ c = 1;
+ }
+
+ /* if the current block is located in an extent,
+ read the next extent */
+ etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
+ if (etype != -1) {
+ laarr[c + 1].extLength = (etype << 30) | elen;
+ laarr[c + 1].extLocation = eloc;
+ count++;
+ startnum++;
+ endnum++;
+ } else
+ lastblock = 1;
+ }
+
+ /* if the current extent is not recorded but allocated, get the
+ * block in the extent corresponding to the requested block */
+ if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
+ newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
+ else { /* otherwise, allocate a new block */
+ if (iinfo->i_next_alloc_block == block)
+ goal = iinfo->i_next_alloc_goal;
+
+ if (!goal) {
+ if (!(goal = pgoal)) /* XXX: what was intended here? */
+ goal = iinfo->i_location.logicalBlockNum + 1;
+ }
+
+ newblocknum = udf_new_block(inode->i_sb, inode,
+ iinfo->i_location.partitionReferenceNum,
+ goal, err);
+ if (!newblocknum) {
+ *err = -ENOSPC;
+ newblock = 0;
+ goto out_free;
+ }
+ if (isBeyondEOF)
+ iinfo->i_lenExtents += inode->i_sb->s_blocksize;
+ }
+
+ /* if the extent the requsted block is located in contains multiple
+ * blocks, split the extent into at most three extents. blocks prior
+ * to requested block, requested block, and blocks after requested
+ * block */
+ udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
+
+ /* We preallocate blocks only for regular files. It also makes sense
+ * for directories but there's a problem when to drop the
+ * preallocation. We might use some delayed work for that but I feel
+ * it's overengineering for a filesystem like UDF. */
+ if (S_ISREG(inode->i_mode))
+ udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
+
+ /* merge any continuous blocks in laarr */
+ udf_merge_extents(inode, laarr, &endnum);
+
+ /* write back the new extents, inserting new extents if the new number
+ * of extents is greater than the old number, and deleting extents if
+ * the new number of extents is less than the old number */
+ udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
+
+ newblock = udf_get_pblock(inode->i_sb, newblocknum,
+ iinfo->i_location.partitionReferenceNum, 0);
+ if (!newblock) {
+ *err = -EIO;
+ goto out_free;
+ }
+ *new = 1;
+ iinfo->i_next_alloc_block = block;
+ iinfo->i_next_alloc_goal = newblocknum;
+ inode->i_ctime = current_time(inode);
+
+ if (IS_SYNC(inode))
+ udf_sync_inode(inode);
+ else
+ mark_inode_dirty(inode);
+out_free:
+ brelse(prev_epos.bh);
+ brelse(cur_epos.bh);
+ brelse(next_epos.bh);
+ return newblock;
+}
+
+static void udf_split_extents(struct inode *inode, int *c, int offset,
+ udf_pblk_t newblocknum,
+ struct kernel_long_ad *laarr, int *endnum)
+{
+ unsigned long blocksize = inode->i_sb->s_blocksize;
+ unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
+
+ if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
+ (laarr[*c].extLength >> 30) ==
+ (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
+ int curr = *c;
+ int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
+ blocksize - 1) >> blocksize_bits;
+ int8_t etype = (laarr[curr].extLength >> 30);
+
+ if (blen == 1)
+ ;
+ else if (!offset || blen == offset + 1) {
+ laarr[curr + 2] = laarr[curr + 1];
+ laarr[curr + 1] = laarr[curr];
+ } else {
+ laarr[curr + 3] = laarr[curr + 1];
+ laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
+ }
+
+ if (offset) {
+ if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
+ udf_free_blocks(inode->i_sb, inode,
+ &laarr[curr].extLocation,
+ 0, offset);
+ laarr[curr].extLength =
+ EXT_NOT_RECORDED_NOT_ALLOCATED |
+ (offset << blocksize_bits);
+ laarr[curr].extLocation.logicalBlockNum = 0;
+ laarr[curr].extLocation.
+ partitionReferenceNum = 0;
+ } else
+ laarr[curr].extLength = (etype << 30) |
+ (offset << blocksize_bits);
+ curr++;
+ (*c)++;
+ (*endnum)++;
+ }
+
+ laarr[curr].extLocation.logicalBlockNum = newblocknum;
+ if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
+ laarr[curr].extLocation.partitionReferenceNum =
+ UDF_I(inode)->i_location.partitionReferenceNum;
+ laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
+ blocksize;
+ curr++;
+
+ if (blen != offset + 1) {
+ if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
+ laarr[curr].extLocation.logicalBlockNum +=
+ offset + 1;
+ laarr[curr].extLength = (etype << 30) |
+ ((blen - (offset + 1)) << blocksize_bits);
+ curr++;
+ (*endnum)++;
+ }
+ }
+}
+
+static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
+ struct kernel_long_ad *laarr,
+ int *endnum)
+{
+ int start, length = 0, currlength = 0, i;
+
+ if (*endnum >= (c + 1)) {
+ if (!lastblock)
+ return;
+ else
+ start = c;
+ } else {
+ if ((laarr[c + 1].extLength >> 30) ==
+ (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
+ start = c + 1;
+ length = currlength =
+ (((laarr[c + 1].extLength &
+ UDF_EXTENT_LENGTH_MASK) +
+ inode->i_sb->s_blocksize - 1) >>
+ inode->i_sb->s_blocksize_bits);
+ } else
+ start = c;
+ }
+
+ for (i = start + 1; i <= *endnum; i++) {
+ if (i == *endnum) {
+ if (lastblock)
+ length += UDF_DEFAULT_PREALLOC_BLOCKS;
+ } else if ((laarr[i].extLength >> 30) ==
+ (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
+ length += (((laarr[i].extLength &
+ UDF_EXTENT_LENGTH_MASK) +
+ inode->i_sb->s_blocksize - 1) >>
+ inode->i_sb->s_blocksize_bits);
+ } else
+ break;
+ }
+
+ if (length) {
+ int next = laarr[start].extLocation.logicalBlockNum +
+ (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
+ inode->i_sb->s_blocksize - 1) >>
+ inode->i_sb->s_blocksize_bits);
+ int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
+ laarr[start].extLocation.partitionReferenceNum,
+ next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
+ length : UDF_DEFAULT_PREALLOC_BLOCKS) -
+ currlength);
+ if (numalloc) {
+ if (start == (c + 1))
+ laarr[start].extLength +=
+ (numalloc <<
+ inode->i_sb->s_blocksize_bits);
+ else {
+ memmove(&laarr[c + 2], &laarr[c + 1],
+ sizeof(struct long_ad) * (*endnum - (c + 1)));
+ (*endnum)++;
+ laarr[c + 1].extLocation.logicalBlockNum = next;
+ laarr[c + 1].extLocation.partitionReferenceNum =
+ laarr[c].extLocation.
+ partitionReferenceNum;
+ laarr[c + 1].extLength =
+ EXT_NOT_RECORDED_ALLOCATED |
+ (numalloc <<
+ inode->i_sb->s_blocksize_bits);
+ start = c + 1;
+ }
+
+ for (i = start + 1; numalloc && i < *endnum; i++) {
+ int elen = ((laarr[i].extLength &
+ UDF_EXTENT_LENGTH_MASK) +
+ inode->i_sb->s_blocksize - 1) >>
+ inode->i_sb->s_blocksize_bits;
+
+ if (elen > numalloc) {
+ laarr[i].extLength -=
+ (numalloc <<
+ inode->i_sb->s_blocksize_bits);
+ numalloc = 0;
+ } else {
+ numalloc -= elen;
+ if (*endnum > (i + 1))
+ memmove(&laarr[i],
+ &laarr[i + 1],
+ sizeof(struct long_ad) *
+ (*endnum - (i + 1)));
+ i--;
+ (*endnum)--;
+ }
+ }
+ UDF_I(inode)->i_lenExtents +=
+ numalloc << inode->i_sb->s_blocksize_bits;
+ }
+ }
+}
+
+static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
+ int *endnum)
+{
+ int i;
+ unsigned long blocksize = inode->i_sb->s_blocksize;
+ unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
+
+ for (i = 0; i < (*endnum - 1); i++) {
+ struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
+ struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
+
+ if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
+ (((li->extLength >> 30) ==
+ (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
+ ((lip1->extLocation.logicalBlockNum -
+ li->extLocation.logicalBlockNum) ==
+ (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
+ blocksize - 1) >> blocksize_bits)))) {
+
+ if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
+ (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
+ blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
+ lip1->extLength = (lip1->extLength -
+ (li->extLength &
+ UDF_EXTENT_LENGTH_MASK) +
+ UDF_EXTENT_LENGTH_MASK) &
+ ~(blocksize - 1);
+ li->extLength = (li->extLength &
+ UDF_EXTENT_FLAG_MASK) +
+ (UDF_EXTENT_LENGTH_MASK + 1) -
+ blocksize;
+ lip1->extLocation.logicalBlockNum =
+ li->extLocation.logicalBlockNum +
+ ((li->extLength &
+ UDF_EXTENT_LENGTH_MASK) >>
+ blocksize_bits);
+ } else {
+ li->extLength = lip1->extLength +
+ (((li->extLength &
+ UDF_EXTENT_LENGTH_MASK) +
+ blocksize - 1) & ~(blocksize - 1));
+ if (*endnum > (i + 2))
+ memmove(&laarr[i + 1], &laarr[i + 2],
+ sizeof(struct long_ad) *
+ (*endnum - (i + 2)));
+ i--;
+ (*endnum)--;
+ }
+ } else if (((li->extLength >> 30) ==
+ (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
+ ((lip1->extLength >> 30) ==
+ (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
+ udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
+ ((li->extLength &
+ UDF_EXTENT_LENGTH_MASK) +
+ blocksize - 1) >> blocksize_bits);
+ li->extLocation.logicalBlockNum = 0;
+ li->extLocation.partitionReferenceNum = 0;
+
+ if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
+ (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
+ blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
+ lip1->extLength = (lip1->extLength -
+ (li->extLength &
+ UDF_EXTENT_LENGTH_MASK) +
+ UDF_EXTENT_LENGTH_MASK) &
+ ~(blocksize - 1);
+ li->extLength = (li->extLength &
+ UDF_EXTENT_FLAG_MASK) +
+ (UDF_EXTENT_LENGTH_MASK + 1) -
+ blocksize;
+ } else {
+ li->extLength = lip1->extLength +
+ (((li->extLength &
+ UDF_EXTENT_LENGTH_MASK) +
+ blocksize - 1) & ~(blocksize - 1));
+ if (*endnum > (i + 2))
+ memmove(&laarr[i + 1], &laarr[i + 2],
+ sizeof(struct long_ad) *
+ (*endnum - (i + 2)));
+ i--;
+ (*endnum)--;
+ }
+ } else if ((li->extLength >> 30) ==
+ (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
+ udf_free_blocks(inode->i_sb, inode,
+ &li->extLocation, 0,
+ ((li->extLength &
+ UDF_EXTENT_LENGTH_MASK) +
+ blocksize - 1) >> blocksize_bits);
+ li->extLocation.logicalBlockNum = 0;
+ li->extLocation.partitionReferenceNum = 0;
+ li->extLength = (li->extLength &
+ UDF_EXTENT_LENGTH_MASK) |
+ EXT_NOT_RECORDED_NOT_ALLOCATED;
+ }
+ }
+}
+
+static void udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
+ int startnum, int endnum,
+ struct extent_position *epos)
+{
+ int start = 0, i;
+ struct kernel_lb_addr tmploc;
+ uint32_t tmplen;
+
+ if (startnum > endnum) {
+ for (i = 0; i < (startnum - endnum); i++)
+ udf_delete_aext(inode, *epos);
+ } else if (startnum < endnum) {
+ for (i = 0; i < (endnum - startnum); i++) {
+ udf_insert_aext(inode, *epos, laarr[i].extLocation,
+ laarr[i].extLength);
+ udf_next_aext(inode, epos, &laarr[i].extLocation,
+ &laarr[i].extLength, 1);
+ start++;
+ }
+ }
+
+ for (i = start; i < endnum; i++) {
+ udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
+ udf_write_aext(inode, epos, &laarr[i].extLocation,
+ laarr[i].extLength, 1);
+ }
+}
+
+struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
+ int create, int *err)
+{
+ struct buffer_head *bh = NULL;
+
+ bh = udf_getblk(inode, block, create, err);
+ if (!bh)
+ return NULL;
+
+ if (buffer_uptodate(bh))
+ return bh;
+
+ ll_rw_block(REQ_OP_READ, 0, 1, &bh);
+
+ wait_on_buffer(bh);
+ if (buffer_uptodate(bh))
+ return bh;
+
+ brelse(bh);
+ *err = -EIO;
+ return NULL;
+}
+
+int udf_setsize(struct inode *inode, loff_t newsize)
+{
+ int err;
+ struct udf_inode_info *iinfo;
+ unsigned int bsize = i_blocksize(inode);
+
+ if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
+ S_ISLNK(inode->i_mode)))
+ return -EINVAL;
+ if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
+ return -EPERM;
+
+ iinfo = UDF_I(inode);
+ if (newsize > inode->i_size) {
+ down_write(&iinfo->i_data_sem);
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+ if (bsize <
+ (udf_file_entry_alloc_offset(inode) + newsize)) {
+ err = udf_expand_file_adinicb(inode);
+ if (err)
+ return err;
+ down_write(&iinfo->i_data_sem);
+ } else {
+ iinfo->i_lenAlloc = newsize;
+ goto set_size;
+ }
+ }
+ err = udf_extend_file(inode, newsize);
+ if (err) {
+ up_write(&iinfo->i_data_sem);
+ return err;
+ }
+set_size:
+ up_write(&iinfo->i_data_sem);
+ truncate_setsize(inode, newsize);
+ } else {
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+ down_write(&iinfo->i_data_sem);
+ udf_clear_extent_cache(inode);
+ memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
+ 0x00, bsize - newsize -
+ udf_file_entry_alloc_offset(inode));
+ iinfo->i_lenAlloc = newsize;
+ truncate_setsize(inode, newsize);
+ up_write(&iinfo->i_data_sem);
+ goto update_time;
+ }
+ err = block_truncate_page(inode->i_mapping, newsize,
+ udf_get_block);
+ if (err)
+ return err;
+ truncate_setsize(inode, newsize);
+ down_write(&iinfo->i_data_sem);
+ udf_clear_extent_cache(inode);
+ udf_truncate_extents(inode);
+ up_write(&iinfo->i_data_sem);
+ }
+update_time:
+ inode->i_mtime = inode->i_ctime = current_time(inode);
+ if (IS_SYNC(inode))
+ udf_sync_inode(inode);
+ else
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+/*
+ * Maximum length of linked list formed by ICB hierarchy. The chosen number is
+ * arbitrary - just that we hopefully don't limit any real use of rewritten
+ * inode on write-once media but avoid looping for too long on corrupted media.
+ */
+#define UDF_MAX_ICB_NESTING 1024
+
+static int udf_read_inode(struct inode *inode, bool hidden_inode)
+{
+ struct buffer_head *bh = NULL;
+ struct fileEntry *fe;
+ struct extendedFileEntry *efe;
+ uint16_t ident;
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
+ struct kernel_lb_addr *iloc = &iinfo->i_location;
+ unsigned int link_count;
+ unsigned int indirections = 0;
+ int bs = inode->i_sb->s_blocksize;
+ int ret = -EIO;
+ uint32_t uid, gid;
+
+reread:
+ if (iloc->partitionReferenceNum >= sbi->s_partitions) {
+ udf_debug("partition reference: %u > logical volume partitions: %u\n",
+ iloc->partitionReferenceNum, sbi->s_partitions);
+ return -EIO;
+ }
+
+ if (iloc->logicalBlockNum >=
+ sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
+ udf_debug("block=%u, partition=%u out of range\n",
+ iloc->logicalBlockNum, iloc->partitionReferenceNum);
+ return -EIO;
+ }
+
+ /*
+ * Set defaults, but the inode is still incomplete!
+ * Note: get_new_inode() sets the following on a new inode:
+ * i_sb = sb
+ * i_no = ino
+ * i_flags = sb->s_flags
+ * i_state = 0
+ * clean_inode(): zero fills and sets
+ * i_count = 1
+ * i_nlink = 1
+ * i_op = NULL;
+ */
+ bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
+ if (!bh) {
+ udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
+ return -EIO;
+ }
+
+ if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
+ ident != TAG_IDENT_USE) {
+ udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
+ inode->i_ino, ident);
+ goto out;
+ }
+
+ fe = (struct fileEntry *)bh->b_data;
+ efe = (struct extendedFileEntry *)bh->b_data;
+
+ if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
+ struct buffer_head *ibh;
+
+ ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
+ if (ident == TAG_IDENT_IE && ibh) {
+ struct kernel_lb_addr loc;
+ struct indirectEntry *ie;
+
+ ie = (struct indirectEntry *)ibh->b_data;
+ loc = lelb_to_cpu(ie->indirectICB.extLocation);
+
+ if (ie->indirectICB.extLength) {
+ brelse(ibh);
+ memcpy(&iinfo->i_location, &loc,
+ sizeof(struct kernel_lb_addr));
+ if (++indirections > UDF_MAX_ICB_NESTING) {
+ udf_err(inode->i_sb,
+ "too many ICBs in ICB hierarchy"
+ " (max %d supported)\n",
+ UDF_MAX_ICB_NESTING);
+ goto out;
+ }
+ brelse(bh);
+ goto reread;
+ }
+ }
+ brelse(ibh);
+ } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
+ udf_err(inode->i_sb, "unsupported strategy type: %u\n",
+ le16_to_cpu(fe->icbTag.strategyType));
+ goto out;
+ }
+ if (fe->icbTag.strategyType == cpu_to_le16(4))
+ iinfo->i_strat4096 = 0;
+ else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
+ iinfo->i_strat4096 = 1;
+
+ iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
+ ICBTAG_FLAG_AD_MASK;
+ iinfo->i_unique = 0;
+ iinfo->i_lenEAttr = 0;
+ iinfo->i_lenExtents = 0;
+ iinfo->i_lenAlloc = 0;
+ iinfo->i_next_alloc_block = 0;
+ iinfo->i_next_alloc_goal = 0;
+ if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
+ iinfo->i_efe = 1;
+ iinfo->i_use = 0;
+ ret = udf_alloc_i_data(inode, bs -
+ sizeof(struct extendedFileEntry));
+ if (ret)
+ goto out;
+ memcpy(iinfo->i_ext.i_data,
+ bh->b_data + sizeof(struct extendedFileEntry),
+ bs - sizeof(struct extendedFileEntry));
+ } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
+ iinfo->i_efe = 0;
+ iinfo->i_use = 0;
+ ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
+ if (ret)
+ goto out;
+ memcpy(iinfo->i_ext.i_data,
+ bh->b_data + sizeof(struct fileEntry),
+ bs - sizeof(struct fileEntry));
+ } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
+ iinfo->i_efe = 0;
+ iinfo->i_use = 1;
+ iinfo->i_lenAlloc = le32_to_cpu(
+ ((struct unallocSpaceEntry *)bh->b_data)->
+ lengthAllocDescs);
+ ret = udf_alloc_i_data(inode, bs -
+ sizeof(struct unallocSpaceEntry));
+ if (ret)
+ goto out;
+ memcpy(iinfo->i_ext.i_data,
+ bh->b_data + sizeof(struct unallocSpaceEntry),
+ bs - sizeof(struct unallocSpaceEntry));
+ return 0;
+ }
+
+ ret = -EIO;
+ read_lock(&sbi->s_cred_lock);
+ uid = le32_to_cpu(fe->uid);
+ if (uid == UDF_INVALID_ID ||
+ UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
+ inode->i_uid = sbi->s_uid;
+ else
+ i_uid_write(inode, uid);
+
+ gid = le32_to_cpu(fe->gid);
+ if (gid == UDF_INVALID_ID ||
+ UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
+ inode->i_gid = sbi->s_gid;
+ else
+ i_gid_write(inode, gid);
+
+ if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
+ sbi->s_fmode != UDF_INVALID_MODE)
+ inode->i_mode = sbi->s_fmode;
+ else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
+ sbi->s_dmode != UDF_INVALID_MODE)
+ inode->i_mode = sbi->s_dmode;
+ else
+ inode->i_mode = udf_convert_permissions(fe);
+ inode->i_mode &= ~sbi->s_umask;
+ read_unlock(&sbi->s_cred_lock);
+
+ link_count = le16_to_cpu(fe->fileLinkCount);
+ if (!link_count) {
+ if (!hidden_inode) {
+ ret = -ESTALE;
+ goto out;
+ }
+ link_count = 1;
+ }
+ set_nlink(inode, link_count);
+
+ inode->i_size = le64_to_cpu(fe->informationLength);
+ iinfo->i_lenExtents = inode->i_size;
+
+ if (iinfo->i_efe == 0) {
+ inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
+ (inode->i_sb->s_blocksize_bits - 9);
+
+ udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime);
+ udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime);
+ udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime);
+
+ iinfo->i_unique = le64_to_cpu(fe->uniqueID);
+ iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
+ iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
+ iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
+ } else {
+ inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
+ (inode->i_sb->s_blocksize_bits - 9);
+
+ udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime);
+ udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime);
+ udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
+ udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime);
+
+ iinfo->i_unique = le64_to_cpu(efe->uniqueID);
+ iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
+ iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
+ iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
+ }
+ inode->i_generation = iinfo->i_unique;
+
+ /*
+ * Sanity check length of allocation descriptors and extended attrs to
+ * avoid integer overflows
+ */
+ if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
+ goto out;
+ /* Now do exact checks */
+ if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
+ goto out;
+ /* Sanity checks for files in ICB so that we don't get confused later */
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+ /*
+ * For file in ICB data is stored in allocation descriptor
+ * so sizes should match
+ */
+ if (iinfo->i_lenAlloc != inode->i_size)
+ goto out;
+ /* File in ICB has to fit in there... */
+ if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
+ goto out;
+ }
+
+ switch (fe->icbTag.fileType) {
+ case ICBTAG_FILE_TYPE_DIRECTORY:
+ inode->i_op = &udf_dir_inode_operations;
+ inode->i_fop = &udf_dir_operations;
+ inode->i_mode |= S_IFDIR;
+ inc_nlink(inode);
+ break;
+ case ICBTAG_FILE_TYPE_REALTIME:
+ case ICBTAG_FILE_TYPE_REGULAR:
+ case ICBTAG_FILE_TYPE_UNDEF:
+ case ICBTAG_FILE_TYPE_VAT20:
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
+ inode->i_data.a_ops = &udf_adinicb_aops;
+ else
+ inode->i_data.a_ops = &udf_aops;
+ inode->i_op = &udf_file_inode_operations;
+ inode->i_fop = &udf_file_operations;
+ inode->i_mode |= S_IFREG;
+ break;
+ case ICBTAG_FILE_TYPE_BLOCK:
+ inode->i_mode |= S_IFBLK;
+ break;
+ case ICBTAG_FILE_TYPE_CHAR:
+ inode->i_mode |= S_IFCHR;
+ break;
+ case ICBTAG_FILE_TYPE_FIFO:
+ init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
+ break;
+ case ICBTAG_FILE_TYPE_SOCKET:
+ init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
+ break;
+ case ICBTAG_FILE_TYPE_SYMLINK:
+ inode->i_data.a_ops = &udf_symlink_aops;
+ inode->i_op = &udf_symlink_inode_operations;
+ inode_nohighmem(inode);
+ inode->i_mode = S_IFLNK | 0777;
+ break;
+ case ICBTAG_FILE_TYPE_MAIN:
+ udf_debug("METADATA FILE-----\n");
+ break;
+ case ICBTAG_FILE_TYPE_MIRROR:
+ udf_debug("METADATA MIRROR FILE-----\n");
+ break;
+ case ICBTAG_FILE_TYPE_BITMAP:
+ udf_debug("METADATA BITMAP FILE-----\n");
+ break;
+ default:
+ udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
+ inode->i_ino, fe->icbTag.fileType);
+ goto out;
+ }
+ if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
+ struct deviceSpec *dsea =
+ (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
+ if (dsea) {
+ init_special_inode(inode, inode->i_mode,
+ MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
+ le32_to_cpu(dsea->minorDeviceIdent)));
+ /* Developer ID ??? */
+ } else
+ goto out;
+ }
+ ret = 0;
+out:
+ brelse(bh);
+ return ret;
+}
+
+static int udf_alloc_i_data(struct inode *inode, size_t size)
+{
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
+ if (!iinfo->i_ext.i_data)
+ return -ENOMEM;
+ return 0;
+}
+
+static umode_t udf_convert_permissions(struct fileEntry *fe)
+{
+ umode_t mode;
+ uint32_t permissions;
+ uint32_t flags;
+
+ permissions = le32_to_cpu(fe->permissions);
+ flags = le16_to_cpu(fe->icbTag.flags);
+
+ mode = ((permissions) & 0007) |
+ ((permissions >> 2) & 0070) |
+ ((permissions >> 4) & 0700) |
+ ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
+ ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
+ ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
+
+ return mode;
+}
+
+int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
+{
+ return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
+}
+
+static int udf_sync_inode(struct inode *inode)
+{
+ return udf_update_inode(inode, 1);
+}
+
+static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
+{
+ if (iinfo->i_crtime.tv_sec > time.tv_sec ||
+ (iinfo->i_crtime.tv_sec == time.tv_sec &&
+ iinfo->i_crtime.tv_nsec > time.tv_nsec))
+ iinfo->i_crtime = time;
+}
+
+static int udf_update_inode(struct inode *inode, int do_sync)
+{
+ struct buffer_head *bh = NULL;
+ struct fileEntry *fe;
+ struct extendedFileEntry *efe;
+ uint64_t lb_recorded;
+ uint32_t udfperms;
+ uint16_t icbflags;
+ uint16_t crclen;
+ int err = 0;
+ struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
+ unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
+ struct udf_inode_info *iinfo = UDF_I(inode);
+
+ bh = udf_tgetblk(inode->i_sb,
+ udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
+ if (!bh) {
+ udf_debug("getblk failure\n");
+ return -EIO;
+ }
+
+ lock_buffer(bh);
+ memset(bh->b_data, 0, inode->i_sb->s_blocksize);
+ fe = (struct fileEntry *)bh->b_data;
+ efe = (struct extendedFileEntry *)bh->b_data;
+
+ if (iinfo->i_use) {
+ struct unallocSpaceEntry *use =
+ (struct unallocSpaceEntry *)bh->b_data;
+
+ use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
+ memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
+ iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
+ sizeof(struct unallocSpaceEntry));
+ use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
+ crclen = sizeof(struct unallocSpaceEntry);
+
+ goto finish;
+ }
+
+ if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
+ fe->uid = cpu_to_le32(UDF_INVALID_ID);
+ else
+ fe->uid = cpu_to_le32(i_uid_read(inode));
+
+ if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
+ fe->gid = cpu_to_le32(UDF_INVALID_ID);
+ else
+ fe->gid = cpu_to_le32(i_gid_read(inode));
+
+ udfperms = ((inode->i_mode & 0007)) |
+ ((inode->i_mode & 0070) << 2) |
+ ((inode->i_mode & 0700) << 4);
+
+ udfperms |= (le32_to_cpu(fe->permissions) &
+ (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
+ FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
+ FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
+ fe->permissions = cpu_to_le32(udfperms);
+
+ if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
+ fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
+ else
+ fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
+
+ fe->informationLength = cpu_to_le64(inode->i_size);
+
+ if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
+ struct regid *eid;
+ struct deviceSpec *dsea =
+ (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
+ if (!dsea) {
+ dsea = (struct deviceSpec *)
+ udf_add_extendedattr(inode,
+ sizeof(struct deviceSpec) +
+ sizeof(struct regid), 12, 0x3);
+ dsea->attrType = cpu_to_le32(12);
+ dsea->attrSubtype = 1;
+ dsea->attrLength = cpu_to_le32(
+ sizeof(struct deviceSpec) +
+ sizeof(struct regid));
+ dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
+ }
+ eid = (struct regid *)dsea->impUse;
+ memset(eid, 0, sizeof(*eid));
+ strcpy(eid->ident, UDF_ID_DEVELOPER);
+ eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
+ eid->identSuffix[1] = UDF_OS_ID_LINUX;
+ dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
+ dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
+ }
+
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
+ lb_recorded = 0; /* No extents => no blocks! */
+ else
+ lb_recorded =
+ (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
+ (blocksize_bits - 9);
+
+ if (iinfo->i_efe == 0) {
+ memcpy(bh->b_data + sizeof(struct fileEntry),
+ iinfo->i_ext.i_data,
+ inode->i_sb->s_blocksize - sizeof(struct fileEntry));
+ fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
+
+ udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
+ udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
+ udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
+ memset(&(fe->impIdent), 0, sizeof(struct regid));
+ strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
+ fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
+ fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
+ fe->uniqueID = cpu_to_le64(iinfo->i_unique);
+ fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
+ fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
+ fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
+ fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
+ crclen = sizeof(struct fileEntry);
+ } else {
+ memcpy(bh->b_data + sizeof(struct extendedFileEntry),
+ iinfo->i_ext.i_data,
+ inode->i_sb->s_blocksize -
+ sizeof(struct extendedFileEntry));
+ efe->objectSize = cpu_to_le64(inode->i_size);
+ efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
+
+ udf_adjust_time(iinfo, inode->i_atime);
+ udf_adjust_time(iinfo, inode->i_mtime);
+ udf_adjust_time(iinfo, inode->i_ctime);
+
+ udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
+ udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
+ udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
+ udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
+
+ memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
+ strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
+ efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
+ efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
+ efe->uniqueID = cpu_to_le64(iinfo->i_unique);
+ efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
+ efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
+ efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
+ efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
+ crclen = sizeof(struct extendedFileEntry);
+ }
+
+finish:
+ if (iinfo->i_strat4096) {
+ fe->icbTag.strategyType = cpu_to_le16(4096);
+ fe->icbTag.strategyParameter = cpu_to_le16(1);
+ fe->icbTag.numEntries = cpu_to_le16(2);
+ } else {
+ fe->icbTag.strategyType = cpu_to_le16(4);
+ fe->icbTag.numEntries = cpu_to_le16(1);
+ }
+
+ if (iinfo->i_use)
+ fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
+ else if (S_ISDIR(inode->i_mode))
+ fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
+ else if (S_ISREG(inode->i_mode))
+ fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
+ else if (S_ISLNK(inode->i_mode))
+ fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
+ else if (S_ISBLK(inode->i_mode))
+ fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
+ else if (S_ISCHR(inode->i_mode))
+ fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
+ else if (S_ISFIFO(inode->i_mode))
+ fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
+ else if (S_ISSOCK(inode->i_mode))
+ fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
+
+ icbflags = iinfo->i_alloc_type |
+ ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
+ ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
+ ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
+ (le16_to_cpu(fe->icbTag.flags) &
+ ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
+ ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
+
+ fe->icbTag.flags = cpu_to_le16(icbflags);
+ if (sbi->s_udfrev >= 0x0200)
+ fe->descTag.descVersion = cpu_to_le16(3);
+ else
+ fe->descTag.descVersion = cpu_to_le16(2);
+ fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
+ fe->descTag.tagLocation = cpu_to_le32(
+ iinfo->i_location.logicalBlockNum);
+ crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
+ fe->descTag.descCRCLength = cpu_to_le16(crclen);
+ fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
+ crclen));
+ fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
+
+ set_buffer_uptodate(bh);
+ unlock_buffer(bh);
+
+ /* write the data blocks */
+ mark_buffer_dirty(bh);
+ if (do_sync) {
+ sync_dirty_buffer(bh);
+ if (buffer_write_io_error(bh)) {
+ udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
+ inode->i_ino);
+ err = -EIO;
+ }
+ }
+ brelse(bh);
+
+ return err;
+}
+
+struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
+ bool hidden_inode)
+{
+ unsigned long block = udf_get_lb_pblock(sb, ino, 0);
+ struct inode *inode = iget_locked(sb, block);
+ int err;
+
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
+ memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
+ err = udf_read_inode(inode, hidden_inode);
+ if (err < 0) {
+ iget_failed(inode);
+ return ERR_PTR(err);
+ }
+ unlock_new_inode(inode);
+
+ return inode;
+}
+
+int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
+ struct extent_position *epos)
+{
+ struct super_block *sb = inode->i_sb;
+ struct buffer_head *bh;
+ struct allocExtDesc *aed;
+ struct extent_position nepos;
+ struct kernel_lb_addr neloc;
+ int ver, adsize;
+
+ if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+ adsize = sizeof(struct short_ad);
+ else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+ adsize = sizeof(struct long_ad);
+ else
+ return -EIO;
+
+ neloc.logicalBlockNum = block;
+ neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
+
+ bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
+ if (!bh)
+ return -EIO;
+ lock_buffer(bh);
+ memset(bh->b_data, 0x00, sb->s_blocksize);
+ set_buffer_uptodate(bh);
+ unlock_buffer(bh);
+ mark_buffer_dirty_inode(bh, inode);
+
+ aed = (struct allocExtDesc *)(bh->b_data);
+ if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
+ aed->previousAllocExtLocation =
+ cpu_to_le32(epos->block.logicalBlockNum);
+ }
+ aed->lengthAllocDescs = cpu_to_le32(0);
+ if (UDF_SB(sb)->s_udfrev >= 0x0200)
+ ver = 3;
+ else
+ ver = 2;
+ udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
+ sizeof(struct tag));
+
+ nepos.block = neloc;
+ nepos.offset = sizeof(struct allocExtDesc);
+ nepos.bh = bh;
+
+ /*
+ * Do we have to copy current last extent to make space for indirect
+ * one?
+ */
+ if (epos->offset + adsize > sb->s_blocksize) {
+ struct kernel_lb_addr cp_loc;
+ uint32_t cp_len;
+ int cp_type;
+
+ epos->offset -= adsize;
+ cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
+ cp_len |= ((uint32_t)cp_type) << 30;
+
+ __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
+ udf_write_aext(inode, epos, &nepos.block,
+ sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
+ } else {
+ __udf_add_aext(inode, epos, &nepos.block,
+ sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
+ }
+
+ brelse(epos->bh);
+ *epos = nepos;
+
+ return 0;
+}
+
+/*
+ * Append extent at the given position - should be the first free one in inode
+ * / indirect extent. This function assumes there is enough space in the inode
+ * or indirect extent. Use udf_add_aext() if you didn't check for this before.
+ */
+int __udf_add_aext(struct inode *inode, struct extent_position *epos,
+ struct kernel_lb_addr *eloc, uint32_t elen, int inc)
+{
+ struct udf_inode_info *iinfo = UDF_I(inode);
+ struct allocExtDesc *aed;
+ int adsize;
+
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+ adsize = sizeof(struct short_ad);
+ else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+ adsize = sizeof(struct long_ad);
+ else
+ return -EIO;
+
+ if (!epos->bh) {
+ WARN_ON(iinfo->i_lenAlloc !=
+ epos->offset - udf_file_entry_alloc_offset(inode));
+ } else {
+ aed = (struct allocExtDesc *)epos->bh->b_data;
+ WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
+ epos->offset - sizeof(struct allocExtDesc));
+ WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
+ }
+
+ udf_write_aext(inode, epos, eloc, elen, inc);
+
+ if (!epos->bh) {
+ iinfo->i_lenAlloc += adsize;
+ mark_inode_dirty(inode);
+ } else {
+ aed = (struct allocExtDesc *)epos->bh->b_data;
+ le32_add_cpu(&aed->lengthAllocDescs, adsize);
+ if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
+ UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
+ udf_update_tag(epos->bh->b_data,
+ epos->offset + (inc ? 0 : adsize));
+ else
+ udf_update_tag(epos->bh->b_data,
+ sizeof(struct allocExtDesc));
+ mark_buffer_dirty_inode(epos->bh, inode);
+ }
+
+ return 0;
+}
+
+/*
+ * Append extent at given position - should be the first free one in inode
+ * / indirect extent. Takes care of allocating and linking indirect blocks.
+ */
+int udf_add_aext(struct inode *inode, struct extent_position *epos,
+ struct kernel_lb_addr *eloc, uint32_t elen, int inc)
+{
+ int adsize;
+ struct super_block *sb = inode->i_sb;
+
+ if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+ adsize = sizeof(struct short_ad);
+ else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+ adsize = sizeof(struct long_ad);
+ else
+ return -EIO;
+
+ if (epos->offset + (2 * adsize) > sb->s_blocksize) {
+ int err;
+ udf_pblk_t new_block;
+
+ new_block = udf_new_block(sb, NULL,
+ epos->block.partitionReferenceNum,
+ epos->block.logicalBlockNum, &err);
+ if (!new_block)
+ return -ENOSPC;
+
+ err = udf_setup_indirect_aext(inode, new_block, epos);
+ if (err)
+ return err;
+ }
+
+ return __udf_add_aext(inode, epos, eloc, elen, inc);
+}
+
+void udf_write_aext(struct inode *inode, struct extent_position *epos,
+ struct kernel_lb_addr *eloc, uint32_t elen, int inc)
+{
+ int adsize;
+ uint8_t *ptr;
+ struct short_ad *sad;
+ struct long_ad *lad;
+ struct udf_inode_info *iinfo = UDF_I(inode);
+
+ if (!epos->bh)
+ ptr = iinfo->i_ext.i_data + epos->offset -
+ udf_file_entry_alloc_offset(inode) +
+ iinfo->i_lenEAttr;
+ else
+ ptr = epos->bh->b_data + epos->offset;
+
+ switch (iinfo->i_alloc_type) {
+ case ICBTAG_FLAG_AD_SHORT:
+ sad = (struct short_ad *)ptr;
+ sad->extLength = cpu_to_le32(elen);
+ sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
+ adsize = sizeof(struct short_ad);
+ break;
+ case ICBTAG_FLAG_AD_LONG:
+ lad = (struct long_ad *)ptr;
+ lad->extLength = cpu_to_le32(elen);
+ lad->extLocation = cpu_to_lelb(*eloc);
+ memset(lad->impUse, 0x00, sizeof(lad->impUse));
+ adsize = sizeof(struct long_ad);
+ break;
+ default:
+ return;
+ }
+
+ if (epos->bh) {
+ if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
+ UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
+ struct allocExtDesc *aed =
+ (struct allocExtDesc *)epos->bh->b_data;
+ udf_update_tag(epos->bh->b_data,
+ le32_to_cpu(aed->lengthAllocDescs) +
+ sizeof(struct allocExtDesc));
+ }
+ mark_buffer_dirty_inode(epos->bh, inode);
+ } else {
+ mark_inode_dirty(inode);
+ }
+
+ if (inc)
+ epos->offset += adsize;
+}
+
+/*
+ * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
+ * someone does some weird stuff.
+ */
+#define UDF_MAX_INDIR_EXTS 16
+
+int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
+ struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
+{
+ int8_t etype;
+ unsigned int indirections = 0;
+
+ while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
+ (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
+ udf_pblk_t block;
+
+ if (++indirections > UDF_MAX_INDIR_EXTS) {
+ udf_err(inode->i_sb,
+ "too many indirect extents in inode %lu\n",
+ inode->i_ino);
+ return -1;
+ }
+
+ epos->block = *eloc;
+ epos->offset = sizeof(struct allocExtDesc);
+ brelse(epos->bh);
+ block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
+ epos->bh = udf_tread(inode->i_sb, block);
+ if (!epos->bh) {
+ udf_debug("reading block %u failed!\n", block);
+ return -1;
+ }
+ }
+
+ return etype;
+}
+
+int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
+ struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
+{
+ int alen;
+ int8_t etype;
+ uint8_t *ptr;
+ struct short_ad *sad;
+ struct long_ad *lad;
+ struct udf_inode_info *iinfo = UDF_I(inode);
+
+ if (!epos->bh) {
+ if (!epos->offset)
+ epos->offset = udf_file_entry_alloc_offset(inode);
+ ptr = iinfo->i_ext.i_data + epos->offset -
+ udf_file_entry_alloc_offset(inode) +
+ iinfo->i_lenEAttr;
+ alen = udf_file_entry_alloc_offset(inode) +
+ iinfo->i_lenAlloc;
+ } else {
+ if (!epos->offset)
+ epos->offset = sizeof(struct allocExtDesc);
+ ptr = epos->bh->b_data + epos->offset;
+ alen = sizeof(struct allocExtDesc) +
+ le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
+ lengthAllocDescs);
+ }
+
+ switch (iinfo->i_alloc_type) {
+ case ICBTAG_FLAG_AD_SHORT:
+ sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
+ if (!sad)
+ return -1;
+ etype = le32_to_cpu(sad->extLength) >> 30;
+ eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
+ eloc->partitionReferenceNum =
+ iinfo->i_location.partitionReferenceNum;
+ *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
+ break;
+ case ICBTAG_FLAG_AD_LONG:
+ lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
+ if (!lad)
+ return -1;
+ etype = le32_to_cpu(lad->extLength) >> 30;
+ *eloc = lelb_to_cpu(lad->extLocation);
+ *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
+ break;
+ default:
+ udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
+ return -1;
+ }
+
+ return etype;
+}
+
+static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
+ struct kernel_lb_addr neloc, uint32_t nelen)
+{
+ struct kernel_lb_addr oeloc;
+ uint32_t oelen;
+ int8_t etype;
+
+ if (epos.bh)
+ get_bh(epos.bh);
+
+ while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
+ udf_write_aext(inode, &epos, &neloc, nelen, 1);
+ neloc = oeloc;
+ nelen = (etype << 30) | oelen;
+ }
+ udf_add_aext(inode, &epos, &neloc, nelen, 1);
+ brelse(epos.bh);
+
+ return (nelen >> 30);
+}
+
+int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
+{
+ struct extent_position oepos;
+ int adsize;
+ int8_t etype;
+ struct allocExtDesc *aed;
+ struct udf_inode_info *iinfo;
+ struct kernel_lb_addr eloc;
+ uint32_t elen;
+
+ if (epos.bh) {
+ get_bh(epos.bh);
+ get_bh(epos.bh);
+ }
+
+ iinfo = UDF_I(inode);
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+ adsize = sizeof(struct short_ad);
+ else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+ adsize = sizeof(struct long_ad);
+ else
+ adsize = 0;
+
+ oepos = epos;
+ if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
+ return -1;
+
+ while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
+ udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
+ if (oepos.bh != epos.bh) {
+ oepos.block = epos.block;
+ brelse(oepos.bh);
+ get_bh(epos.bh);
+ oepos.bh = epos.bh;
+ oepos.offset = epos.offset - adsize;
+ }
+ }
+ memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
+ elen = 0;
+
+ if (epos.bh != oepos.bh) {
+ udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
+ udf_write_aext(inode, &oepos, &eloc, elen, 1);
+ udf_write_aext(inode, &oepos, &eloc, elen, 1);
+ if (!oepos.bh) {
+ iinfo->i_lenAlloc -= (adsize * 2);
+ mark_inode_dirty(inode);
+ } else {
+ aed = (struct allocExtDesc *)oepos.bh->b_data;
+ le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
+ if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
+ UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
+ udf_update_tag(oepos.bh->b_data,
+ oepos.offset - (2 * adsize));
+ else
+ udf_update_tag(oepos.bh->b_data,
+ sizeof(struct allocExtDesc));
+ mark_buffer_dirty_inode(oepos.bh, inode);
+ }
+ } else {
+ udf_write_aext(inode, &oepos, &eloc, elen, 1);
+ if (!oepos.bh) {
+ iinfo->i_lenAlloc -= adsize;
+ mark_inode_dirty(inode);
+ } else {
+ aed = (struct allocExtDesc *)oepos.bh->b_data;
+ le32_add_cpu(&aed->lengthAllocDescs, -adsize);
+ if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
+ UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
+ udf_update_tag(oepos.bh->b_data,
+ epos.offset - adsize);
+ else
+ udf_update_tag(oepos.bh->b_data,
+ sizeof(struct allocExtDesc));
+ mark_buffer_dirty_inode(oepos.bh, inode);
+ }
+ }
+
+ brelse(epos.bh);
+ brelse(oepos.bh);
+
+ return (elen >> 30);
+}
+
+int8_t inode_bmap(struct inode *inode, sector_t block,
+ struct extent_position *pos, struct kernel_lb_addr *eloc,
+ uint32_t *elen, sector_t *offset)
+{
+ unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
+ loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
+ int8_t etype;
+ struct udf_inode_info *iinfo;
+
+ iinfo = UDF_I(inode);
+ if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
+ pos->offset = 0;
+ pos->block = iinfo->i_location;
+ pos->bh = NULL;
+ }
+ *elen = 0;
+ do {
+ etype = udf_next_aext(inode, pos, eloc, elen, 1);
+ if (etype == -1) {
+ *offset = (bcount - lbcount) >> blocksize_bits;
+ iinfo->i_lenExtents = lbcount;
+ return -1;
+ }
+ lbcount += *elen;
+ } while (lbcount <= bcount);
+ /* update extent cache */
+ udf_update_extent_cache(inode, lbcount - *elen, pos);
+ *offset = (bcount + *elen - lbcount) >> blocksize_bits;
+
+ return etype;
+}
+
+udf_pblk_t udf_block_map(struct inode *inode, sector_t block)
+{
+ struct kernel_lb_addr eloc;
+ uint32_t elen;
+ sector_t offset;
+ struct extent_position epos = {};
+ udf_pblk_t ret;
+
+ down_read(&UDF_I(inode)->i_data_sem);
+
+ if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
+ (EXT_RECORDED_ALLOCATED >> 30))
+ ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
+ else
+ ret = 0;
+
+ up_read(&UDF_I(inode)->i_data_sem);
+ brelse(epos.bh);
+
+ if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
+ return udf_fixed_to_variable(ret);
+ else
+ return ret;
+}