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ext4: cleanup transaction restarts during inode deletion

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During inode deletion, the number of journal credits that will be
needed is hard to determine.  For that reason we have journal
extend/restart calls in several places.  Whenever a transaction is
restarted, filesystem must be in a consistent state because there is
no atomicity guarantee beyond a restart call.

Add ext4_xattr_ensure_credits() helper function which takes care of
journal extend/restart logic.  It also handles getting jbd2 write
access and dirty metadata calls.  This function is called at every
iteration of handling an ea_inode reference.

Signed-off-by: Tahsin Erdogan <tahsin@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Tahsin Erdogan
2017-06-22 11:42:09 -04:00
committed by Theodore Ts'o
parent 02749a4c20
commit 30a7eb970c
3 changed files with 184 additions and 143 deletions
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66
fs/ext4/inode.c
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@@ -239,7 +239,11 @@ void ext4_evict_inode(struct inode *inode)
*/
sb_start_intwrite(inode->i_sb);
handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, extra_credits);
if (!IS_NOQUOTA(inode))
extra_credits += EXT4_MAXQUOTAS_DEL_BLOCKS(inode->i_sb);
handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE,
ext4_blocks_for_truncate(inode)+extra_credits);
if (IS_ERR(handle)) {
ext4_std_error(inode->i_sb, PTR_ERR(handle));
/*
@@ -251,36 +255,9 @@ void ext4_evict_inode(struct inode *inode)
sb_end_intwrite(inode->i_sb);
goto no_delete;
}
if (IS_SYNC(inode))
ext4_handle_sync(handle);
/*
* Delete xattr inode before deleting the main inode.
*/
err = ext4_xattr_delete_inode(handle, inode, &ea_inode_array);
if (err) {
ext4_warning(inode->i_sb,
"couldn't delete inode's xattr (err %d)", err);
goto stop_handle;
}
if (!IS_NOQUOTA(inode))
extra_credits += 2 * EXT4_QUOTA_DEL_BLOCKS(inode->i_sb);
if (!ext4_handle_has_enough_credits(handle,
ext4_blocks_for_truncate(inode) + extra_credits)) {
err = ext4_journal_extend(handle,
ext4_blocks_for_truncate(inode) + extra_credits);
if (err > 0)
err = ext4_journal_restart(handle,
ext4_blocks_for_truncate(inode) + extra_credits);
if (err != 0) {
ext4_warning(inode->i_sb,
"couldn't extend journal (err %d)", err);
goto stop_handle;
}
}
inode->i_size = 0;
err = ext4_mark_inode_dirty(handle, inode);
if (err) {
@@ -298,25 +275,17 @@ void ext4_evict_inode(struct inode *inode)
}
}
/*
* ext4_ext_truncate() doesn't reserve any slop when it
* restarts journal transactions; therefore there may not be
* enough credits left in the handle to remove the inode from
* the orphan list and set the dtime field.
*/
if (!ext4_handle_has_enough_credits(handle, extra_credits)) {
err = ext4_journal_extend(handle, extra_credits);
if (err > 0)
err = ext4_journal_restart(handle, extra_credits);
if (err != 0) {
ext4_warning(inode->i_sb,
"couldn't extend journal (err %d)", err);
stop_handle:
ext4_journal_stop(handle);
ext4_orphan_del(NULL, inode);
sb_end_intwrite(inode->i_sb);
goto no_delete;
}
/* Remove xattr references. */
err = ext4_xattr_delete_inode(handle, inode, &ea_inode_array,
extra_credits);
if (err) {
ext4_warning(inode->i_sb, "xattr delete (err %d)", err);
stop_handle:
ext4_journal_stop(handle);
ext4_orphan_del(NULL, inode);
sb_end_intwrite(inode->i_sb);
ext4_xattr_inode_array_free(ea_inode_array);
goto no_delete;
}
/*
@@ -342,7 +311,6 @@ void ext4_evict_inode(struct inode *inode)
ext4_clear_inode(inode);
else
ext4_free_inode(handle, inode);
ext4_journal_stop(handle);
sb_end_intwrite(inode->i_sb);
ext4_xattr_inode_array_free(ea_inode_array);