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inode.c
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inode.c
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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/smp_lock.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include <linux/slab.h>
#include "udf_i.h"
#include "udf_sb.h"
MODULE_AUTHOR("Ben Fennema");
MODULE_DESCRIPTION("Universal Disk Format Filesystem");
MODULE_LICENSE("GPL");
#define EXTENT_MERGE_SIZE 5
static mode_t udf_convert_permissions(struct fileEntry *);
static int udf_update_inode(struct inode *, int);
static void udf_fill_inode(struct inode *, struct buffer_head *);
static struct buffer_head *inode_getblk(struct inode *, long, int *,
long *, int *);
static int8_t udf_insert_aext(struct inode *, kernel_lb_addr, int,
kernel_lb_addr, uint32_t, struct buffer_head *);
static void udf_split_extents(struct inode *, int *, int, int,
kernel_long_ad [EXTENT_MERGE_SIZE], int *);
static void udf_prealloc_extents(struct inode *, int, int,
kernel_long_ad [EXTENT_MERGE_SIZE], int *);
static void udf_merge_extents(struct inode *,
kernel_long_ad [EXTENT_MERGE_SIZE], int *);
static void udf_update_extents(struct inode *,
kernel_long_ad [EXTENT_MERGE_SIZE], int, int,
kernel_lb_addr, uint32_t, struct buffer_head **);
static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
/*
* udf_delete_inode
*
* PURPOSE
* Clean-up before the specified inode is destroyed.
*
* DESCRIPTION
* This routine is called when the kernel destroys an inode structure
* ie. when iput() finds i_count == 0.
*
* HISTORY
* July 1, 1997 - Andrew E. Mileski
* Written, tested, and released.
*
* Called at the last iput() if i_nlink is zero.
*/
void udf_delete_inode(struct inode * inode)
{
truncate_inode_pages(&inode->i_data, 0);
if (is_bad_inode(inode))
goto no_delete;
inode->i_size = 0;
udf_truncate(inode);
lock_kernel();
udf_update_inode(inode, IS_SYNC(inode));
udf_free_inode(inode);
unlock_kernel();
return;
no_delete:
clear_inode(inode);
}
void udf_clear_inode(struct inode *inode)
{
if (!(inode->i_sb->s_flags & MS_RDONLY)) {
lock_kernel();
udf_discard_prealloc(inode);
unlock_kernel();
}
kfree(UDF_I_DATA(inode));
UDF_I_DATA(inode) = NULL;
}
static int udf_writepage(struct page *page, struct writeback_control *wbc)
{
return block_write_full_page(page, udf_get_block, wbc);
}
static int udf_readpage(struct file *file, struct page *page)
{
return block_read_full_page(page, udf_get_block);
}
static int udf_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
{
return block_prepare_write(page, from, to, udf_get_block);
}
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,
.writepage = udf_writepage,
.sync_page = block_sync_page,
.prepare_write = udf_prepare_write,
.commit_write = generic_commit_write,
.bmap = udf_bmap,
};
void udf_expand_file_adinicb(struct inode * inode, int newsize, int * err)
{
struct page *page;
char *kaddr;
struct writeback_control udf_wbc = {
.sync_mode = WB_SYNC_NONE,
.nr_to_write = 1,
};
/* from now on we have normal address_space methods */
inode->i_data.a_ops = &udf_aops;
if (!UDF_I_LENALLOC(inode))
{
if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
else
UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
mark_inode_dirty(inode);
return;
}
page = grab_cache_page(inode->i_mapping, 0);
BUG_ON(!PageLocked(page));
if (!PageUptodate(page))
{
kaddr = kmap(page);
memset(kaddr + UDF_I_LENALLOC(inode), 0x00,
PAGE_CACHE_SIZE - UDF_I_LENALLOC(inode));
memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode),
UDF_I_LENALLOC(inode));
flush_dcache_page(page);
SetPageUptodate(page);
kunmap(page);
}
memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0x00,
UDF_I_LENALLOC(inode));
UDF_I_LENALLOC(inode) = 0;
if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
else
UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
inode->i_data.a_ops->writepage(page, &udf_wbc);
page_cache_release(page);
mark_inode_dirty(inode);
}
struct buffer_head * udf_expand_dir_adinicb(struct inode *inode, int *block, int *err)
{
int newblock;
struct buffer_head *sbh = NULL, *dbh = NULL;
kernel_lb_addr bloc, eloc;
uint32_t elen, extoffset;
uint8_t alloctype;
struct udf_fileident_bh sfibh, dfibh;
loff_t f_pos = udf_ext0_offset(inode) >> 2;
int size = (udf_ext0_offset(inode) + inode->i_size) >> 2;
struct fileIdentDesc cfi, *sfi, *dfi;
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)
{
UDF_I_ALLOCTYPE(inode) = alloctype;
mark_inode_dirty(inode);
return NULL;
}
/* alloc block, and copy data to it */
*block = udf_new_block(inode->i_sb, inode,
UDF_I_LOCATION(inode).partitionReferenceNum,
UDF_I_LOCATION(inode).logicalBlockNum, err);
if (!(*block))
return NULL;
newblock = udf_get_pblock(inode->i_sb, *block,
UDF_I_LOCATION(inode).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) >> 2)) << 2;
sbh = sfibh.sbh = sfibh.ebh = NULL;
dfibh.soffset = dfibh.eoffset = 0;
dfibh.sbh = dfibh.ebh = dbh;
while ( (f_pos < size) )
{
UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL, NULL, NULL, NULL, NULL, NULL);
if (!sfi)
{
udf_release_data(dbh);
return NULL;
}
UDF_I_ALLOCTYPE(inode) = 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)))
{
UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
udf_release_data(dbh);
return NULL;
}
}
mark_buffer_dirty_inode(dbh, inode);
memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0, UDF_I_LENALLOC(inode));
UDF_I_LENALLOC(inode) = 0;
bloc = UDF_I_LOCATION(inode);
eloc.logicalBlockNum = *block;
eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
elen = inode->i_size;
UDF_I_LENEXTENTS(inode) = elen;
extoffset = udf_file_entry_alloc_offset(inode);
udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &sbh, 0);
/* UniqueID stuff */
udf_release_data(sbh);
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;
struct buffer_head *bh;
unsigned long phys;
if (!create)
{
phys = udf_block_map(inode, block);
if (phys)
map_bh(bh_result, inode->i_sb, phys);
return 0;
}
err = -EIO;
new = 0;
bh = NULL;
lock_kernel();
if (block < 0)
goto abort_negative;
if (block == UDF_I_NEXT_ALLOC_BLOCK(inode) + 1)
{
UDF_I_NEXT_ALLOC_BLOCK(inode) ++;
UDF_I_NEXT_ALLOC_GOAL(inode) ++;
}
err = 0;
bh = inode_getblk(inode, block, &err, &phys, &new);
BUG_ON(bh);
if (err)
goto abort;
BUG_ON(!phys);
if (new)
set_buffer_new(bh_result);
map_bh(bh_result, inode->i_sb, phys);
abort:
unlock_kernel();
return err;
abort_negative:
udf_warning(inode->i_sb, "udf_get_block", "block < 0");
goto abort;
}
static struct buffer_head *
udf_getblk(struct inode *inode, long block, int create, int *err)
{
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))
{
struct buffer_head *bh;
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;
}
static struct buffer_head * inode_getblk(struct inode * inode, long block,
int *err, long *phys, int *new)
{
struct buffer_head *pbh = NULL, *cbh = NULL, *nbh = NULL, *result = NULL;
kernel_long_ad laarr[EXTENT_MERGE_SIZE];
uint32_t pextoffset = 0, cextoffset = 0, nextoffset = 0;
int count = 0, startnum = 0, endnum = 0;
uint32_t elen = 0;
kernel_lb_addr eloc, pbloc, cbloc, nbloc;
int c = 1;
uint64_t lbcount = 0, b_off = 0;
uint32_t newblocknum, newblock, offset = 0;
int8_t etype;
int goal = 0, pgoal = UDF_I_LOCATION(inode).logicalBlockNum;
char lastblock = 0;
pextoffset = cextoffset = nextoffset = udf_file_entry_alloc_offset(inode);
b_off = (uint64_t)block << inode->i_sb->s_blocksize_bits;
pbloc = cbloc = nbloc = UDF_I_LOCATION(inode);
/* 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 (pbh != cbh)
{
udf_release_data(pbh);
atomic_inc(&cbh->b_count);
pbh = cbh;
}
if (cbh != nbh)
{
udf_release_data(cbh);
atomic_inc(&nbh->b_count);
cbh = nbh;
}
lbcount += elen;
pbloc = cbloc;
cbloc = nbloc;
pextoffset = cextoffset;
cextoffset = nextoffset;
if ((etype = udf_next_aext(inode, &nbloc, &nextoffset, &eloc, &elen, &nbh, 1)) == -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;
/* 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));
etype = udf_write_aext(inode, nbloc, &cextoffset, eloc, elen, nbh, 1);
}
udf_release_data(pbh);
udf_release_data(cbh);
udf_release_data(nbh);
newblock = udf_get_lb_pblock(inode->i_sb, eloc, offset);
*phys = newblock;
return NULL;
}
if (etype == -1)
{
endnum = startnum = ((count > 1) ? 1 : count);
if (laarr[c].extLength & (inode->i_sb->s_blocksize - 1))
{
laarr[c].extLength =
(laarr[c].extLength & UDF_EXTENT_FLAG_MASK) |
(((laarr[c].extLength & UDF_EXTENT_LENGTH_MASK) +
inode->i_sb->s_blocksize - 1) &
~(inode->i_sb->s_blocksize - 1));
UDF_I_LENEXTENTS(inode) =
(UDF_I_LENEXTENTS(inode) + inode->i_sb->s_blocksize - 1) &
~(inode->i_sb->s_blocksize - 1);
}
c = !c;
laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
((offset + 1) << inode->i_sb->s_blocksize_bits);
memset(&laarr[c].extLocation, 0x00, sizeof(kernel_lb_addr));
count ++;
endnum ++;
lastblock = 1;
}
else
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 a extent, read the next extent */
if (etype != -1)
{
if ((etype = udf_next_aext(inode, &nbloc, &nextoffset, &eloc, &elen, &nbh, 0)) != -1)
{
laarr[c+1].extLength = (etype << 30) | elen;
laarr[c+1].extLocation = eloc;
count ++;
startnum ++;
endnum ++;
}
else
lastblock = 1;
}
udf_release_data(cbh);
udf_release_data(nbh);
/* 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 (UDF_I_NEXT_ALLOC_BLOCK(inode) == block)
goal = UDF_I_NEXT_ALLOC_GOAL(inode);
if (!goal)
{
if (!(goal = pgoal))
goal = UDF_I_LOCATION(inode).logicalBlockNum + 1;
}
if (!(newblocknum = udf_new_block(inode->i_sb, inode,
UDF_I_LOCATION(inode).partitionReferenceNum, goal, err)))
{
udf_release_data(pbh);
*err = -ENOSPC;
return NULL;
}
UDF_I_LENEXTENTS(inode) += 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);
#ifdef UDF_PREALLOCATE
/* preallocate blocks */
udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
#endif
/* 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, pbloc, pextoffset, &pbh);
udf_release_data(pbh);
if (!(newblock = udf_get_pblock(inode->i_sb, newblocknum,
UDF_I_LOCATION(inode).partitionReferenceNum, 0)))
{
return NULL;
}
*phys = newblock;
*err = 0;
*new = 1;
UDF_I_NEXT_ALLOC_BLOCK(inode) = block;
UDF_I_NEXT_ALLOC_GOAL(inode) = newblocknum;
inode->i_ctime = current_fs_time(inode->i_sb);
if (IS_SYNC(inode))
udf_sync_inode(inode);
else
mark_inode_dirty(inode);
return result;
}
static void udf_split_extents(struct inode *inode, int *c, int offset, int newblocknum,
kernel_long_ad laarr[EXTENT_MERGE_SIZE], int *endnum)
{
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) +
inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_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 << inode->i_sb->s_blocksize_bits);
laarr[curr].extLocation.logicalBlockNum = 0;
laarr[curr].extLocation.partitionReferenceNum = 0;
}
else
laarr[curr].extLength = (etype << 30) |
(offset << inode->i_sb->s_blocksize_bits);
curr ++;
(*c) ++;
(*endnum) ++;
}
laarr[curr].extLocation.logicalBlockNum = newblocknum;
if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
laarr[curr].extLocation.partitionReferenceNum =
UDF_I_LOCATION(inode).partitionReferenceNum;
laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
inode->i_sb->s_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)) << inode->i_sb->s_blocksize_bits);
curr ++;
(*endnum) ++;
}
}
}
static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
kernel_long_ad laarr[EXTENT_MERGE_SIZE], 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(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(long_ad) * (*endnum - (i+1)));
i --;
(*endnum) --;
}
}
UDF_I_LENEXTENTS(inode) += numalloc << inode->i_sb->s_blocksize_bits;
}
}
}
static void udf_merge_extents(struct inode *inode,
kernel_long_ad laarr[EXTENT_MERGE_SIZE], int *endnum)
{
int i;
for (i=0; i<(*endnum-1); i++)
{
if ((laarr[i].extLength >> 30) == (laarr[i+1].extLength >> 30))
{
if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
((laarr[i+1].extLocation.logicalBlockNum - laarr[i].extLocation.logicalBlockNum) ==
(((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits)))
{
if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
(laarr[i+1].extLength & UDF_EXTENT_LENGTH_MASK) +
inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK)
{
laarr[i+1].extLength = (laarr[i+1].extLength -
(laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize-1);
laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) +
(UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize;
laarr[i+1].extLocation.logicalBlockNum =
laarr[i].extLocation.logicalBlockNum +
((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) >>
inode->i_sb->s_blocksize_bits);
}
else
{
laarr[i].extLength = laarr[i+1].extLength +
(((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize-1));
if (*endnum > (i+2))
memmove(&laarr[i+1], &laarr[i+2],
sizeof(long_ad) * (*endnum - (i+2)));
i --;
(*endnum) --;
}
}
}
else if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
((laarr[i+1].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)))
{
udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0,
((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
laarr[i].extLocation.logicalBlockNum = 0;
laarr[i].extLocation.partitionReferenceNum = 0;
if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
(laarr[i+1].extLength & UDF_EXTENT_LENGTH_MASK) +
inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK)
{
laarr[i+1].extLength = (laarr[i+1].extLength -
(laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize-1);
laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) +
(UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize;
}
else
{
laarr[i].extLength = laarr[i+1].extLength +
(((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize-1));
if (*endnum > (i+2))
memmove(&laarr[i+1], &laarr[i+2],
sizeof(long_ad) * (*endnum - (i+2)));
i --;
(*endnum) --;
}
}
else if ((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
{
udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0,
((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
laarr[i].extLocation.logicalBlockNum = 0;
laarr[i].extLocation.partitionReferenceNum = 0;
laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) |
EXT_NOT_RECORDED_NOT_ALLOCATED;
}
}
}
static void udf_update_extents(struct inode *inode,
kernel_long_ad laarr[EXTENT_MERGE_SIZE], int startnum, int endnum,
kernel_lb_addr pbloc, uint32_t pextoffset, struct buffer_head **pbh)
{
int start = 0, i;
kernel_lb_addr tmploc;
uint32_t tmplen;
if (startnum > endnum)
{
for (i=0; i<(startnum-endnum); i++)
{
udf_delete_aext(inode, pbloc, pextoffset, laarr[i].extLocation,
laarr[i].extLength, *pbh);
}
}
else if (startnum < endnum)
{
for (i=0; i<(endnum-startnum); i++)
{
udf_insert_aext(inode, pbloc, pextoffset, laarr[i].extLocation,
laarr[i].extLength, *pbh);
udf_next_aext(inode, &pbloc, &pextoffset, &laarr[i].extLocation,
&laarr[i].extLength, pbh, 1);
start ++;
}
}
for (i=start; i<endnum; i++)
{
udf_next_aext(inode, &pbloc, &pextoffset, &tmploc, &tmplen, pbh, 0);
udf_write_aext(inode, pbloc, &pextoffset, laarr[i].extLocation,
laarr[i].extLength, *pbh, 1);
}
}
struct buffer_head * udf_bread(struct inode * inode, int 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(READ, 1, &bh);
wait_on_buffer(bh);
if (buffer_uptodate(bh))
return bh;
brelse(bh);
*err = -EIO;
return NULL;
}
void udf_truncate(struct inode * inode)
{
int offset;
int err;
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
S_ISLNK(inode->i_mode)))
return;
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
return;
lock_kernel();
if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
{
if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
inode->i_size))
{
udf_expand_file_adinicb(inode, inode->i_size, &err);
if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
{
inode->i_size = UDF_I_LENALLOC(inode);
unlock_kernel();
return;
}
else
udf_truncate_extents(inode);
}
else
{
offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset, 0x00, inode->i_sb->s_blocksize - offset - udf_file_entry_alloc_offset(inode));
UDF_I_LENALLOC(inode) = inode->i_size;
}
}
else
{
block_truncate_page(inode->i_mapping, inode->i_size, udf_get_block);
udf_truncate_extents(inode);
}
inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
if (IS_SYNC(inode))
udf_sync_inode (inode);
else
mark_inode_dirty(inode);
unlock_kernel();
}
static void
__udf_read_inode(struct inode *inode)
{
struct buffer_head *bh = NULL;
struct fileEntry *fe;
uint16_t ident;
/*
* 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;
*/
inode->i_blksize = PAGE_SIZE;
bh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 0, &ident);
if (!bh)
{
printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
inode->i_ino);
make_bad_inode(inode);
return;
}
if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
ident != TAG_IDENT_USE)
{
printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed ident=%d\n",
inode->i_ino, ident);
udf_release_data(bh);
make_bad_inode(inode);
return;
}
fe = (struct fileEntry *)bh->b_data;
if (le16_to_cpu(fe->icbTag.strategyType) == 4096)
{
struct buffer_head *ibh = NULL, *nbh = NULL;
struct indirectEntry *ie;
ibh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 1, &ident);
if (ident == TAG_IDENT_IE)
{
if (ibh)
{
kernel_lb_addr loc;
ie = (struct indirectEntry *)ibh->b_data;
loc = lelb_to_cpu(ie->indirectICB.extLocation);
if (ie->indirectICB.extLength &&
(nbh = udf_read_ptagged(inode->i_sb, loc, 0, &ident)))
{
if (ident == TAG_IDENT_FE ||
ident == TAG_IDENT_EFE)
{
memcpy(&UDF_I_LOCATION(inode), &loc, sizeof(kernel_lb_addr));
udf_release_data(bh);
udf_release_data(ibh);
udf_release_data(nbh);
__udf_read_inode(inode);
return;
}
else
{
udf_release_data(nbh);
udf_release_data(ibh);
}
}
else
udf_release_data(ibh);
}
}
else
udf_release_data(ibh);
}
else if (le16_to_cpu(fe->icbTag.strategyType) != 4)
{
printk(KERN_ERR "udf: unsupported strategy type: %d\n",
le16_to_cpu(fe->icbTag.strategyType));
udf_release_data(bh);
make_bad_inode(inode);
return;
}
udf_fill_inode(inode, bh);
udf_release_data(bh);
}
static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
{
struct fileEntry *fe;
struct extendedFileEntry *efe;
time_t convtime;