int hfsplus_journaled_get_block(struct page *page)
{
struct inode * const inode = page->mapping->host;
struct super_block * const sb = inode->i_sb;
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
u32 ablock, res;
sector_t iblock;
s32 block_num = -1;
iblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
ablock = iblock >> HFSPLUS_SB(sb)->fs_shift;
if (ablock < hip->first_blocks) {
block_num = hfsplus_ext_find_block(hip->first_extents, ablock);
}
else {
mutex_lock(&hip->extents_lock);
res = hfsplus_ext_read_extent(inode, ablock);
if (!res) {
mutex_lock(&hip->extents_lock);
block_num = hfsplus_ext_find_block(hip->cached_extents, ablock -
hip->cached_start);
mutex_unlock(&hip->extents_lock);
} else {
mutex_unlock(&hip->extents_lock);
}
mutex_unlock(&hip->extents_lock);
}
return block_num;
}
/* Get a block at iblock for inode, possibly allocating if create */
int hfsplus_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
struct super_block *sb;
int res = -EIO;
u32 ablock, dblock, mask;
int shift;
sb = inode->i_sb;
/* Convert inode block to disk allocation block */
shift = HFSPLUS_SB(sb).alloc_blksz_shift - sb->s_blocksize_bits;
ablock = iblock >> HFSPLUS_SB(sb).fs_shift;
if (iblock >= inode->i_blocks) {
if (iblock > inode->i_blocks || !create)
return -EIO;
if (ablock >= HFSPLUS_I(inode).alloc_blocks) {
res = hfsplus_file_extend(inode);
if (res)
return res;
}
} else
create = 0;
if (ablock < HFSPLUS_I(inode).first_blocks) {
dblock = hfsplus_ext_find_block(HFSPLUS_I(inode).first_extents, ablock);
goto done;
}
down(&HFSPLUS_I(inode).extents_lock);
res = hfsplus_ext_read_extent(inode, ablock);
if (!res) {
dblock = hfsplus_ext_find_block(HFSPLUS_I(inode).cached_extents, ablock -
HFSPLUS_I(inode).cached_start);
} else {
up(&HFSPLUS_I(inode).extents_lock);
return -EIO;
}
up(&HFSPLUS_I(inode).extents_lock);
done:
dprint(DBG_EXTENT, "get_block(%lu): %llu - %u\n", inode->i_ino, (long long)iblock, dblock);
mask = (1 << HFSPLUS_SB(sb).fs_shift) - 1;
map_bh(bh_result, sb, (dblock << HFSPLUS_SB(sb).fs_shift) + HFSPLUS_SB(sb).blockoffset + (iblock & mask));
if (create) {
set_buffer_new(bh_result);
HFSPLUS_I(inode).phys_size += sb->s_blocksize;
inode->i_blocks++;
mark_inode_dirty(inode);
}
return 0;
}
int hfsplus_file_extend(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
u32 start, len, goal;
int res;
if (HFSPLUS_SB(sb).alloc_file->i_size * 8 < HFSPLUS_SB(sb).total_blocks - HFSPLUS_SB(sb).free_blocks + 8) {
// extend alloc file
printk("extend alloc file! (%Lu,%u,%u)\n", HFSPLUS_SB(sb).alloc_file->i_size * 8,
HFSPLUS_SB(sb).total_blocks, HFSPLUS_SB(sb).free_blocks);
return -ENOSPC;
//BUG();
}
down(&HFSPLUS_I(inode).extents_lock);
if (HFSPLUS_I(inode).alloc_blocks == HFSPLUS_I(inode).first_blocks)
goal = hfsplus_ext_lastblock(HFSPLUS_I(inode).first_extents);
else {
res = hfsplus_ext_read_extent(inode, HFSPLUS_I(inode).alloc_blocks);
if (res)
goto out;
goal = hfsplus_ext_lastblock(HFSPLUS_I(inode).cached_extents);
}
len = HFSPLUS_I(inode).clump_blocks;
start = hfsplus_block_allocate(sb, HFSPLUS_SB(sb).total_blocks, goal, &len);
if (start >= HFSPLUS_SB(sb).total_blocks) {
start = hfsplus_block_allocate(sb, goal, 0, &len);
if (start >= goal) {
res = -ENOSPC;
goto out;
}
}
dprint(DBG_EXTENT, "extend %lu: %u,%u\n", inode->i_ino, start, len);
if (HFSPLUS_I(inode).alloc_blocks <= HFSPLUS_I(inode).first_blocks) {
if (!HFSPLUS_I(inode).first_blocks) {
dprint(DBG_EXTENT, "first extents\n");
/* no extents yet */
HFSPLUS_I(inode).first_extents[0].start_block = cpu_to_be32(start);
HFSPLUS_I(inode).first_extents[0].block_count = cpu_to_be32(len);
res = 0;
} else {
/* try to append to extents in inode */
res = hfsplus_add_extent(HFSPLUS_I(inode).first_extents,
HFSPLUS_I(inode).alloc_blocks,
start, len);
if (res == -ENOSPC)
goto insert_extent;
}
if (!res) {
hfsplus_dump_extent(HFSPLUS_I(inode).first_extents);
HFSPLUS_I(inode).first_blocks += len;
}
} else {
res = hfsplus_add_extent(HFSPLUS_I(inode).cached_extents,
HFSPLUS_I(inode).alloc_blocks -
HFSPLUS_I(inode).cached_start,
start, len);
if (!res) {
hfsplus_dump_extent(HFSPLUS_I(inode).cached_extents);
HFSPLUS_I(inode).flags |= HFSPLUS_FLG_EXT_DIRTY;
HFSPLUS_I(inode).cached_blocks += len;
} else if (res == -ENOSPC)
goto insert_extent;
}
out:
up(&HFSPLUS_I(inode).extents_lock);
if (!res) {
HFSPLUS_I(inode).alloc_blocks += len;
mark_inode_dirty(inode);
}
return res;
insert_extent:
dprint(DBG_EXTENT, "insert new extent\n");
hfsplus_ext_write_extent(inode);
memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
HFSPLUS_I(inode).cached_extents[0].start_block = cpu_to_be32(start);
HFSPLUS_I(inode).cached_extents[0].block_count = cpu_to_be32(len);
hfsplus_dump_extent(HFSPLUS_I(inode).cached_extents);
HFSPLUS_I(inode).flags |= HFSPLUS_FLG_EXT_DIRTY | HFSPLUS_FLG_EXT_NEW;
HFSPLUS_I(inode).cached_start = HFSPLUS_I(inode).alloc_blocks;
HFSPLUS_I(inode).cached_blocks = len;
res = 0;
goto out;
}
int hfsplus_file_extend(struct inode *inode, bool zeroout)
{
struct super_block *sb = inode->i_sb;
struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
u32 start, len, goal;
int res;
if (sbi->alloc_file->i_size * 8 <
sbi->total_blocks - sbi->free_blocks + 8) {
/* extend alloc file */
pr_err("extend alloc file! (%llu,%u,%u)\n",
sbi->alloc_file->i_size * 8,
sbi->total_blocks, sbi->free_blocks);
return -ENOSPC;
}
mutex_lock(&hip->extents_lock);
if (hip->alloc_blocks == hip->first_blocks)
goal = hfsplus_ext_lastblock(hip->first_extents);
else {
res = hfsplus_ext_read_extent(inode, hip->alloc_blocks);
if (res)
goto out;
goal = hfsplus_ext_lastblock(hip->cached_extents);
}
len = hip->clump_blocks;
start = hfsplus_block_allocate(sb, sbi->total_blocks, goal, &len);
if (start >= sbi->total_blocks) {
start = hfsplus_block_allocate(sb, goal, 0, &len);
if (start >= goal) {
res = -ENOSPC;
goto out;
}
}
if (zeroout) {
res = sb_issue_zeroout(sb, start, len, GFP_NOFS);
if (res)
goto out;
}
hfs_dbg(EXTENT, "extend %lu: %u,%u\n", inode->i_ino, start, len);
if (hip->alloc_blocks <= hip->first_blocks) {
if (!hip->first_blocks) {
hfs_dbg(EXTENT, "first extents\n");
/* no extents yet */
hip->first_extents[0].start_block = cpu_to_be32(start);
hip->first_extents[0].block_count = cpu_to_be32(len);
res = 0;
} else {
/* try to append to extents in inode */
res = hfsplus_add_extent(hip->first_extents,
hip->alloc_blocks,
start, len);
if (res == -ENOSPC)
goto insert_extent;
}
if (!res) {
hfsplus_dump_extent(hip->first_extents);
hip->first_blocks += len;
}
} else {
res = hfsplus_add_extent(hip->cached_extents,
hip->alloc_blocks - hip->cached_start,
start, len);
if (!res) {
hfsplus_dump_extent(hip->cached_extents);
hip->extent_state |= HFSPLUS_EXT_DIRTY;
hip->cached_blocks += len;
} else if (res == -ENOSPC)
goto insert_extent;
}
out:
if (!res) {
hip->alloc_blocks += len;
mutex_unlock(&hip->extents_lock);
hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ALLOC_DIRTY);
return 0;
}
mutex_unlock(&hip->extents_lock);
return res;
insert_extent:
hfs_dbg(EXTENT, "insert new extent\n");
res = hfsplus_ext_write_extent_locked(inode);
if (res)
goto out;
memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
hip->cached_extents[0].start_block = cpu_to_be32(start);
hip->cached_extents[0].block_count = cpu_to_be32(len);
hfsplus_dump_extent(hip->cached_extents);
hip->extent_state |= HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW;
hip->cached_start = hip->alloc_blocks;
hip->cached_blocks = len;
res = 0;
goto out;
}
/* Get a block at iblock for inode, possibly allocating if create */
int hfsplus_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
struct super_block *sb = inode->i_sb;
struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
int res = -EIO;
u32 ablock, dblock, mask;
sector_t sector;
int was_dirty = 0;
/* Convert inode block to disk allocation block */
ablock = iblock >> sbi->fs_shift;
if (iblock >= hip->fs_blocks) {
if (iblock > hip->fs_blocks || !create)
return -EIO;
if (ablock >= hip->alloc_blocks) {
res = hfsplus_file_extend(inode, false);
if (res)
return res;
}
} else
create = 0;
if (ablock < hip->first_blocks) {
dblock = hfsplus_ext_find_block(hip->first_extents, ablock);
goto done;
}
if (inode->i_ino == HFSPLUS_EXT_CNID)
return -EIO;
mutex_lock(&hip->extents_lock);
/*
* hfsplus_ext_read_extent will write out a cached extent into
* the extents btree. In that case we may have to mark the inode
* dirty even for a pure read of an extent here.
*/
was_dirty = (hip->extent_state & HFSPLUS_EXT_DIRTY);
res = hfsplus_ext_read_extent(inode, ablock);
if (res) {
mutex_unlock(&hip->extents_lock);
return -EIO;
}
dblock = hfsplus_ext_find_block(hip->cached_extents,
ablock - hip->cached_start);
mutex_unlock(&hip->extents_lock);
done:
hfs_dbg(EXTENT, "get_block(%lu): %llu - %u\n",
inode->i_ino, (long long)iblock, dblock);
mask = (1 << sbi->fs_shift) - 1;
sector = ((sector_t)dblock << sbi->fs_shift) +
sbi->blockoffset + (iblock & mask);
map_bh(bh_result, sb, sector);
if (create) {
set_buffer_new(bh_result);
hip->phys_size += sb->s_blocksize;
hip->fs_blocks++;
inode_add_bytes(inode, sb->s_blocksize);
}
if (create || was_dirty)
mark_inode_dirty(inode);
return 0;
}
/* Get a block at iblock for inode, possibly allocating if create */
int hfsplus_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
struct super_block *sb;
int res = -EIO;
u32 ablock, dblock, mask;
int shift;
hfsplus_handle_t *hfsplus_handle, tmp_hfsplus_handle;
tmp_hfsplus_handle.journaled = !HFSPLUS_JOURNAL_PRESENT;
tmp_hfsplus_handle.handle = NULL;
sb = inode->i_sb;
/* Journal device */
if (HFSPLUS_SB(sb).jnl.journaled == HFSPLUS_JOURNAL_PRESENT) {
/* Write Metadata */
if (((inode->i_mapping->a_ops == &hfsplus_journalled_btree_aops) ||
(inode->i_mapping->a_ops == &hfsplus_journalled_aops)) && create) {
hfsplus_handle = hfsplus_jbd_current_handle();
if (hfsplus_handle == NULL) {
printk("hfsplus_handle is NULL\n");
hfsplus_handle = &tmp_hfsplus_handle;
}
}
else {
hfsplus_handle = &tmp_hfsplus_handle;
}
}
/* Non-journal device */
else {
hfsplus_handle = &tmp_hfsplus_handle;
}
/* Convert inode block to disk allocation block */
shift = HFSPLUS_SB(sb).alloc_blksz_shift - sb->s_blocksize_bits;
ablock = iblock >> HFSPLUS_SB(sb).fs_shift;
if (iblock >= HFSPLUS_I(inode).fs_blocks) {
if (iblock > HFSPLUS_I(inode).fs_blocks || !create) {
return -EIO;
}
if (ablock >= HFSPLUS_I(inode).alloc_blocks) {
res = hfsplus_file_extend(hfsplus_handle, inode);
if (res) {
return res;
}
}
} else
create = 0;
if (ablock < HFSPLUS_I(inode).first_blocks) {
dblock = hfsplus_ext_find_block(HFSPLUS_I(inode).first_extents, ablock);
goto done;
}
mutex_lock(&HFSPLUS_I(inode).extents_lock);
res = hfsplus_ext_read_extent(hfsplus_handle, inode, ablock);
if (!res) {
dblock = hfsplus_ext_find_block(HFSPLUS_I(inode).cached_extents, ablock -
HFSPLUS_I(inode).cached_start);
} else {
mutex_unlock(&HFSPLUS_I(inode).extents_lock);
return -EIO;
}
mutex_unlock(&HFSPLUS_I(inode).extents_lock);
done:
dprint(DBG_EXTENT, "get_block(%lu): %llu - %u\n", inode->i_ino, (long long)iblock, dblock);
mask = (1 << HFSPLUS_SB(sb).fs_shift) - 1;
map_bh(bh_result, sb, (dblock << HFSPLUS_SB(sb).fs_shift) + HFSPLUS_SB(sb).blockoffset + (iblock & mask));
if (create) {
set_buffer_new(bh_result);
HFSPLUS_I(inode).phys_size += sb->s_blocksize;
HFSPLUS_I(inode).fs_blocks++;
inode_add_bytes(inode, sb->s_blocksize);
if (hfsplus_journalled_mark_inode_dirty(__FUNCTION__, hfsplus_handle, inode)) {
printk("HFS+-fs: Error in %s()\n", __FUNCTION__);
return -1;
}
}
return 0;
}