if (handle->h_buffer_credits > needed)
return 0;
err = ext4_journal_extend(handle, needed);
- if (err)
+ if (err <= 0)
return err;
return ext4_journal_restart(handle, needed);
}
return bg_start + colour + block;
}
+/*
+ * Allocation for a meta data block
+ */
static ext4_fsblk_t
-ext4_ext_new_block(handle_t *handle, struct inode *inode,
+ext4_ext_new_meta_block(handle_t *handle, struct inode *inode,
struct ext4_ext_path *path,
struct ext4_extent *ex, int *err)
{
return size;
}
+/*
+ * Calculate the number of metadata blocks needed
+ * to allocate @blocks
+ * Worse case is one block per extent
+ */
+int ext4_ext_calc_metadata_amount(struct inode *inode, int blocks)
+{
+ int lcap, icap, rcap, leafs, idxs, num;
+ int newextents = blocks;
+
+ rcap = ext4_ext_space_root_idx(inode);
+ lcap = ext4_ext_space_block(inode);
+ icap = ext4_ext_space_block_idx(inode);
+
+ /* number of new leaf blocks needed */
+ num = leafs = (newextents + lcap - 1) / lcap;
+
+ /*
+ * Worse case, we need separate index block(s)
+ * to link all new leaf blocks
+ */
+ idxs = (leafs + icap - 1) / icap;
+ do {
+ num += idxs;
+ idxs = (idxs + icap - 1) / icap;
+ } while (idxs > rcap);
+
+ return num;
+}
+
static int
ext4_ext_max_entries(struct inode *inode, int depth)
{
/* allocate all needed blocks */
ext_debug("allocate %d blocks for indexes/leaf\n", depth - at);
for (a = 0; a < depth - at; a++) {
- newblock = ext4_ext_new_block(handle, inode, path, newext, &err);
+ newblock = ext4_ext_new_meta_block(handle, inode, path,
+ newext, &err);
if (newblock == 0)
goto cleanup;
ablocks[a] = newblock;
ext4_fsblk_t newblock;
int err = 0;
- newblock = ext4_ext_new_block(handle, inode, path, newext, &err);
+ newblock = ext4_ext_new_meta_block(handle, inode, path, newext, &err);
if (newblock == 0)
return err;
/*
* get the next allocated block if the extent in the path
- * is before the requested block(s)
+ * is before the requested block(s)
*/
if (b2 < b1) {
b2 = ext4_ext_next_allocated_block(path);
BUG_ON(b != ex_ee_block + ex_ee_len - 1);
}
- /* at present, extent can't cross block group: */
- /* leaf + bitmap + group desc + sb + inode */
- credits = 5;
+ /*
+ * 3 for leaf, sb, and inode plus 2 (bmap and group
+ * descriptor) for each block group; assume two block
+ * groups plus ex_ee_len/blocks_per_block_group for
+ * the worst case
+ */
+ credits = 7 + 2*(ex_ee_len/EXT4_BLOCKS_PER_GROUP(inode->i_sb));
if (ex == EXT_FIRST_EXTENT(eh)) {
correct_index = 1;
credits += (ext_depth(inode)) + 1;
unsigned int newdepth;
/* If extent has less than EXT4_EXT_ZERO_LEN zerout directly */
if (allocated <= EXT4_EXT_ZERO_LEN) {
- /* Mark first half uninitialized.
+ /*
+ * iblock == ee_block is handled by the zerouout
+ * at the beginning.
+ * Mark first half uninitialized.
* Mark second half initialized and zero out the
* initialized extent
*/
ex->ee_len = orig_ex.ee_len;
ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
ext4_ext_dirty(handle, inode, path + depth);
- /* zeroed the full extent */
+ /* blocks available from iblock */
return allocated;
} else if (err)
err = PTR_ERR(path);
return err;
}
+ /* get the second half extent details */
ex = path[depth].p_ext;
err = ext4_ext_get_access(handle, inode,
path + depth);
ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
ext4_ext_dirty(handle, inode, path + depth);
/* zeroed the full extent */
+ /* blocks available from iblock */
return allocated;
} else if (err)
*/
orig_ex.ee_len = cpu_to_le16(ee_len -
ext4_ext_get_actual_len(ex3));
- if (newdepth != depth) {
- depth = newdepth;
- ext4_ext_drop_refs(path);
- path = ext4_ext_find_extent(inode, iblock, path);
- if (IS_ERR(path)) {
- err = PTR_ERR(path);
- goto out;
- }
- eh = path[depth].p_hdr;
- ex = path[depth].p_ext;
- if (ex2 != &newex)
- ex2 = ex;
-
- err = ext4_ext_get_access(handle, inode, path + depth);
- if (err)
- goto out;
+ depth = newdepth;
+ ext4_ext_drop_refs(path);
+ path = ext4_ext_find_extent(inode, iblock, path);
+ if (IS_ERR(path)) {
+ err = PTR_ERR(path);
+ goto out;
}
+ eh = path[depth].p_hdr;
+ ex = path[depth].p_ext;
+ if (ex2 != &newex)
+ ex2 = ex;
+
+ err = ext4_ext_get_access(handle, inode, path + depth);
+ if (err)
+ goto out;
+
allocated = max_blocks;
/* If extent has less than EXT4_EXT_ZERO_LEN and we are trying
ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
ext4_ext_dirty(handle, inode, path + depth);
/* zero out the first half */
+ /* blocks available from iblock */
return allocated;
}
}
int err = 0, depth, ret;
unsigned long allocated = 0;
struct ext4_allocation_request ar;
+ loff_t disksize;
__clear_bit(BH_New, &bh_result->b_state);
ext_debug("blocks %u/%lu requested for inode %u\n",
*/
if (allocated > max_blocks)
allocated = max_blocks;
- /* mark the buffer unwritten */
- __set_bit(BH_Unwritten, &bh_result->b_state);
+ set_buffer_unwritten(bh_result);
goto out2;
}
newblock = ext_pblock(&newex);
allocated = ext4_ext_get_actual_len(&newex);
outnew:
- if (extend_disksize && inode->i_size > EXT4_I(inode)->i_disksize)
- EXT4_I(inode)->i_disksize = inode->i_size;
+ if (extend_disksize) {
+ disksize = ((loff_t) iblock + ar.len) << inode->i_blkbits;
+ if (disksize > i_size_read(inode))
+ disksize = i_size_read(inode);
+ if (disksize > EXT4_I(inode)->i_disksize)
+ EXT4_I(inode)->i_disksize = disksize;
+ }
- __set_bit(BH_New, &bh_result->b_state);
+ set_buffer_new(bh_result);
/* Cache only when it is _not_ an uninitialized extent */
if (create != EXT4_CREATE_UNINITIALIZED_EXT)
if (allocated > max_blocks)
allocated = max_blocks;
ext4_ext_show_leaf(inode, path);
- __set_bit(BH_Mapped, &bh_result->b_state);
+ set_buffer_mapped(bh_result);
bh_result->b_bdev = inode->i_sb->s_bdev;
bh_result->b_blocknr = newblock;
out2:
return err ? err : allocated;
}
-void ext4_ext_truncate(struct inode * inode, struct page *page)
+void ext4_ext_truncate(struct inode *inode)
{
struct address_space *mapping = inode->i_mapping;
struct super_block *sb = inode->i_sb;
*/
err = ext4_writepage_trans_blocks(inode) + 3;
handle = ext4_journal_start(inode, err);
- if (IS_ERR(handle)) {
- if (page) {
- clear_highpage(page);
- flush_dcache_page(page);
- unlock_page(page);
- page_cache_release(page);
- }
+ if (IS_ERR(handle))
return;
- }
- if (page)
- ext4_block_truncate_page(handle, page, mapping, inode->i_size);
+ if (inode->i_size & (sb->s_blocksize - 1))
+ ext4_block_truncate_page(handle, mapping, inode->i_size);
+
+ if (ext4_orphan_add(handle, inode))
+ goto out_stop;
down_write(&EXT4_I(inode)->i_data_sem);
ext4_ext_invalidate_cache(inode);
* Probably we need not scan at all,
* because page truncation is enough.
*/
- if (ext4_orphan_add(handle, inode))
- goto out_stop;
/* we have to know where to truncate from in crash case */
EXT4_I(inode)->i_disksize = inode->i_size;
handle->h_sync = 1;
out_stop:
+ up_write(&EXT4_I(inode)->i_data_sem);
/*
* If this was a simple ftruncate() and the file will remain alive,
* then we need to clear up the orphan record which we created above.
if (inode->i_nlink)
ext4_orphan_del(handle, inode);
- up_write(&EXT4_I(inode)->i_data_sem);
inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
ext4_mark_inode_dirty(handle, inode);
ext4_journal_stop(handle);
}
ret = ext4_get_blocks_wrap(handle, inode, block,
max_blocks, &map_bh,
- EXT4_CREATE_UNINITIALIZED_EXT, 0);
+ EXT4_CREATE_UNINITIALIZED_EXT, 0, 0);
if (ret <= 0) {
#ifdef EXT4FS_DEBUG
WARN_ON(ret <= 0);
projects / linux-2.6 / blobdiff