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Date: Tue, 1 Nov 2011 18:53:35 +0800
From: Robin Dong <hao.bigrat@...il.com>
To: linux-ext4@...r.kernel.org
Cc: Robin Dong <sanbai@...bao.com>
Subject: [PATCH 6/8 bigalloc] ext4: directories allocate a cluster when it need spaces
From: Robin Dong <sanbai@...bao.com>
allocate a cluster instead of a block when directories need new space.
Signed-off-by: Robin Dong <sanbai@...bao.com>
---
fs/ext4/namei.c | 54 +++++++++++++++++++++++++++++++++++++++---------------
1 files changed, 39 insertions(+), 15 deletions(-)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 1c924fa..e8618ea 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -49,6 +49,16 @@
#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
#define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
+static void ext4_zero_append(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, ext4_lblk_t block)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
+
+ if ((sbi->s_cluster_ratio > 1) &&
+ (block % sbi->s_cluster_ratio))
+ memset(bh->b_data, 0, inode->i_sb->s_blocksize);
+}
+
static struct buffer_head *ext4_append(handle_t *handle,
struct inode *inode,
ext4_lblk_t *block, int *err)
@@ -59,6 +69,7 @@ static struct buffer_head *ext4_append(handle_t *handle,
bh = ext4_bread(handle, inode, *block, 1, err);
if (bh) {
+ ext4_zero_append(handle, inode, bh, *block);
inode->i_size += inode->i_sb->s_blocksize;
EXT4_I(inode)->i_disksize = inode->i_size;
*err = ext4_journal_get_write_access(handle, bh);
@@ -1811,10 +1822,12 @@ static int ext4_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
handle_t *handle;
struct inode *inode;
- struct buffer_head *dir_block = NULL;
+ struct buffer_head *first_block = NULL;
+ struct buffer_head *dir_block[EXT4_MAX_CTXT_PAGES];
struct ext4_dir_entry_2 *de;
+ struct ext4_sb_info *sbi = EXT4_SB(dir->i_sb);
unsigned int blocksize = dir->i_sb->s_blocksize;
- int err, retries = 0;
+ int i, err, retries = 0;
if (EXT4_DIR_LINK_MAX(dir))
return -EMLINK;
@@ -1824,6 +1837,7 @@ static int ext4_mkdir(struct inode *dir, struct dentry *dentry, int mode)
retry:
handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
+ sbi->s_cluster_ratio +
EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
if (IS_ERR(handle))
return PTR_ERR(handle);
@@ -1840,14 +1854,20 @@ retry:
inode->i_op = &ext4_dir_inode_operations;
inode->i_fop = &ext4_dir_operations;
inode->i_size = EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
- dir_block = ext4_bread(handle, inode, 0, 1, &err);
- if (!dir_block)
- goto out_clear_inode;
- BUFFER_TRACE(dir_block, "get_write_access");
- err = ext4_journal_get_write_access(handle, dir_block);
- if (err)
- goto out_clear_inode;
- de = (struct ext4_dir_entry_2 *) dir_block->b_data;
+
+ for (i = 0; i < sbi->s_cluster_ratio; i++) {
+ dir_block[i] = ext4_bread(handle, inode, i, 1, &err);
+ if (!dir_block[i])
+ goto out_clear_inode;
+ BUFFER_TRACE(dir_block[i], "get_write_access");
+ memset(dir_block[i]->b_data, 0, inode->i_sb->s_blocksize);
+ set_buffer_uptodate(dir_block[i]);
+ err = ext4_journal_get_write_access(handle, dir_block[i]);
+ if (err)
+ goto out_clear_inode;
+ }
+ first_block = dir_block[0];
+ de = (struct ext4_dir_entry_2 *) first_block->b_data;
de->inode = cpu_to_le32(inode->i_ino);
de->name_len = 1;
de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len),
@@ -1862,10 +1882,13 @@ retry:
strcpy(de->name, "..");
ext4_set_de_type(dir->i_sb, de, S_IFDIR);
inode->i_nlink = 2;
- BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
- err = ext4_handle_dirty_metadata(handle, dir, dir_block);
- if (err)
- goto out_clear_inode;
+ BUFFER_TRACE(first_block, "call ext4_handle_dirty_metadata");
+
+ for (i = 0; i < sbi->s_cluster_ratio; i++) {
+ err = ext4_handle_dirty_metadata(handle, dir, dir_block[i]);
+ if (err)
+ goto out_clear_inode;
+ }
err = ext4_mark_inode_dirty(handle, inode);
if (!err)
err = ext4_add_entry(handle, dentry, inode);
@@ -1885,7 +1908,8 @@ out_clear_inode:
d_instantiate(dentry, inode);
unlock_new_inode(inode);
out_stop:
- brelse(dir_block);
+ for (i = 0; i < sbi->s_cluster_ratio; i++)
+ brelse(dir_block[i]);
ext4_journal_stop(handle);
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
goto retry;
--
1.7.3.2
--
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