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linux/fs/udf/inode.c
Jan Kara 0c9850f4d4 udf: Clean up handling of invalid uid/gid 
Current code relies on the fact that invalid uid/gid as defined by UDF
2.60 3.3.3.1 and 3.3.3.2 coincides with invalid uid/gid as used by the
user namespaces implementation. Since this is only lucky coincidence,
clean this up to avoid future surprises in case user namespaces
implementation changes. Also this is more robust in presence of valid
(from UDF point of view) uids / gids which do not map into current user
namespace.

Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
2018-02-27 10:25:33 +01:00

2319 lines
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/*
* 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, laarr[i].extLocation,
laarr[i].extLength);
} 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);
if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
inode->i_atime = sbi->s_record_time;
if (!udf_disk_stamp_to_time(&inode->i_mtime,
fe->modificationTime))
inode->i_mtime = sbi->s_record_time;
if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
inode->i_ctime = sbi->s_record_time;
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);
if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
inode->i_atime = sbi->s_record_time;
if (!udf_disk_stamp_to_time(&inode->i_mtime,
efe->modificationTime))
inode->i_mtime = sbi->s_record_time;
if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
iinfo->i_crtime = sbi->s_record_time;
if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
inode->i_ctime = sbi->s_record_time;
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 timespec 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 kernel_lb_addr eloc, uint32_t elen)
{
struct extent_position oepos;
int adsize;
int8_t etype;
struct allocExtDesc *aed;
struct udf_inode_info *iinfo;
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;
}
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