ext4: start handle at the last possible moment when creating inodes
In ext4_{create,mknod,mkdir,symlink}(), don't start the journal handle
until the inode has been succesfully allocated. In order to do this,
we need to start the handle in the ext4_new_inode(). So create a new
variant of this function, ext4_new_inode_start_handle(), so the handle
can be created at the last possible minute, before we need to modify
the inode allocation bitmap block.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 5f3d2b5..3e1529c 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2257,30 +2257,28 @@
{
handle_t *handle;
struct inode *inode;
- int err, retries = 0;
+ int err, credits, retries = 0;
dquot_initialize(dir);
+ credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
+ EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
+ EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
retry:
- handle = ext4_journal_start(dir, EXT4_HT_DIR,
- (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
- EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
- EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb)));
- if (IS_ERR(handle))
- return PTR_ERR(handle);
-
- if (IS_DIRSYNC(dir))
- ext4_handle_sync(handle);
-
- inode = ext4_new_inode(handle, dir, mode, &dentry->d_name, 0, NULL);
+ inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
+ NULL, EXT4_HT_DIR, credits);
+ handle = ext4_journal_current_handle();
err = PTR_ERR(inode);
if (!IS_ERR(inode)) {
inode->i_op = &ext4_file_inode_operations;
inode->i_fop = &ext4_file_operations;
ext4_set_aops(inode);
err = ext4_add_nondir(handle, dentry, inode);
+ if (!err && IS_DIRSYNC(dir))
+ ext4_handle_sync(handle);
}
- ext4_journal_stop(handle);
+ if (handle)
+ ext4_journal_stop(handle);
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
goto retry;
return err;
@@ -2291,32 +2289,30 @@
{
handle_t *handle;
struct inode *inode;
- int err, retries = 0;
+ int err, credits, retries = 0;
if (!new_valid_dev(rdev))
return -EINVAL;
dquot_initialize(dir);
+ credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
+ EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
+ EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
retry:
- handle = ext4_journal_start(dir, EXT4_HT_DIR,
- (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
- EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
- EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb)));
- if (IS_ERR(handle))
- return PTR_ERR(handle);
-
- if (IS_DIRSYNC(dir))
- ext4_handle_sync(handle);
-
- inode = ext4_new_inode(handle, dir, mode, &dentry->d_name, 0, NULL);
+ inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
+ NULL, EXT4_HT_DIR, credits);
+ handle = ext4_journal_current_handle();
err = PTR_ERR(inode);
if (!IS_ERR(inode)) {
init_special_inode(inode, inode->i_mode, rdev);
inode->i_op = &ext4_special_inode_operations;
err = ext4_add_nondir(handle, dentry, inode);
+ if (!err && IS_DIRSYNC(dir))
+ ext4_handle_sync(handle);
}
- ext4_journal_stop(handle);
+ if (handle)
+ ext4_journal_stop(handle);
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
goto retry;
return err;
@@ -2408,26 +2404,21 @@
{
handle_t *handle;
struct inode *inode;
- int err, retries = 0;
+ int err, credits, retries = 0;
if (EXT4_DIR_LINK_MAX(dir))
return -EMLINK;
dquot_initialize(dir);
+ credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
+ EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
+ EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
retry:
- handle = ext4_journal_start(dir, EXT4_HT_DIR,
- (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
- EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
- EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb)));
- if (IS_ERR(handle))
- return PTR_ERR(handle);
-
- if (IS_DIRSYNC(dir))
- ext4_handle_sync(handle);
-
- inode = ext4_new_inode(handle, dir, S_IFDIR | mode,
- &dentry->d_name, 0, NULL);
+ inode = ext4_new_inode_start_handle(dir, S_IFDIR | mode,
+ &dentry->d_name,
+ 0, NULL, EXT4_HT_DIR, credits);
+ handle = ext4_journal_current_handle();
err = PTR_ERR(inode);
if (IS_ERR(inode))
goto out_stop;
@@ -2455,8 +2446,12 @@
goto out_clear_inode;
unlock_new_inode(inode);
d_instantiate(dentry, inode);
+ if (IS_DIRSYNC(dir))
+ ext4_handle_sync(handle);
+
out_stop:
- ext4_journal_stop(handle);
+ if (handle)
+ ext4_journal_stop(handle);
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
goto retry;
return err;
@@ -2883,15 +2878,10 @@
EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb);
}
retry:
- handle = ext4_journal_start(dir, EXT4_HT_DIR, credits);
- if (IS_ERR(handle))
- return PTR_ERR(handle);
-
- if (IS_DIRSYNC(dir))
- ext4_handle_sync(handle);
-
- inode = ext4_new_inode(handle, dir, S_IFLNK|S_IRWXUGO,
- &dentry->d_name, 0, NULL);
+ inode = ext4_new_inode_start_handle(dir, S_IFLNK|S_IRWXUGO,
+ &dentry->d_name, 0, NULL,
+ EXT4_HT_DIR, credits);
+ handle = ext4_journal_current_handle();
err = PTR_ERR(inode);
if (IS_ERR(inode))
goto out_stop;
@@ -2944,8 +2934,12 @@
}
EXT4_I(inode)->i_disksize = inode->i_size;
err = ext4_add_nondir(handle, dentry, inode);
+ if (!err && IS_DIRSYNC(dir))
+ ext4_handle_sync(handle);
+
out_stop:
- ext4_journal_stop(handle);
+ if (handle)
+ ext4_journal_stop(handle);
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
goto retry;
return err;