146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
/*
|
|
* Interface between ext4 and JBD
|
|
*/
|
|
|
|
#include "ext4_jbd2.h"
|
|
|
|
#include <trace/events/ext4.h>
|
|
|
|
int __ext4_journal_get_undo_access(const char *where, handle_t *handle,
|
|
struct buffer_head *bh)
|
|
{
|
|
int err = 0;
|
|
|
|
if (ext4_handle_valid(handle)) {
|
|
err = jbd2_journal_get_undo_access(handle, bh);
|
|
if (err)
|
|
ext4_journal_abort_handle(where, __func__, bh,
|
|
handle, err);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int __ext4_journal_get_write_access(const char *where, handle_t *handle,
|
|
struct buffer_head *bh)
|
|
{
|
|
int err = 0;
|
|
|
|
if (ext4_handle_valid(handle)) {
|
|
err = jbd2_journal_get_write_access(handle, bh);
|
|
if (err)
|
|
ext4_journal_abort_handle(where, __func__, bh,
|
|
handle, err);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* The ext4 forget function must perform a revoke if we are freeing data
|
|
* which has been journaled. Metadata (eg. indirect blocks) must be
|
|
* revoked in all cases.
|
|
*
|
|
* "bh" may be NULL: a metadata block may have been freed from memory
|
|
* but there may still be a record of it in the journal, and that record
|
|
* still needs to be revoked.
|
|
*
|
|
* If the handle isn't valid we're not journaling, but we still need to
|
|
* call into ext4_journal_revoke() to put the buffer head.
|
|
*/
|
|
int __ext4_forget(const char *where, handle_t *handle, int is_metadata,
|
|
struct inode *inode, struct buffer_head *bh,
|
|
ext4_fsblk_t blocknr)
|
|
{
|
|
int err;
|
|
|
|
might_sleep();
|
|
|
|
trace_ext4_forget(inode, is_metadata, blocknr);
|
|
BUFFER_TRACE(bh, "enter");
|
|
|
|
jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
|
|
"data mode %x\n",
|
|
bh, is_metadata, inode->i_mode,
|
|
test_opt(inode->i_sb, DATA_FLAGS));
|
|
|
|
/* In the no journal case, we can just do a bforget and return */
|
|
if (!ext4_handle_valid(handle)) {
|
|
bforget(bh);
|
|
return 0;
|
|
}
|
|
|
|
/* Never use the revoke function if we are doing full data
|
|
* journaling: there is no need to, and a V1 superblock won't
|
|
* support it. Otherwise, only skip the revoke on un-journaled
|
|
* data blocks. */
|
|
|
|
if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
|
|
(!is_metadata && !ext4_should_journal_data(inode))) {
|
|
if (bh) {
|
|
BUFFER_TRACE(bh, "call jbd2_journal_forget");
|
|
err = jbd2_journal_forget(handle, bh);
|
|
if (err)
|
|
ext4_journal_abort_handle(where, __func__, bh,
|
|
handle, err);
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* data!=journal && (is_metadata || should_journal_data(inode))
|
|
*/
|
|
BUFFER_TRACE(bh, "call jbd2_journal_revoke");
|
|
err = jbd2_journal_revoke(handle, blocknr, bh);
|
|
if (err) {
|
|
ext4_journal_abort_handle(where, __func__, bh, handle, err);
|
|
ext4_abort(inode->i_sb, __func__,
|
|
"error %d when attempting revoke", err);
|
|
}
|
|
BUFFER_TRACE(bh, "exit");
|
|
return err;
|
|
}
|
|
|
|
int __ext4_journal_get_create_access(const char *where,
|
|
handle_t *handle, struct buffer_head *bh)
|
|
{
|
|
int err = 0;
|
|
|
|
if (ext4_handle_valid(handle)) {
|
|
err = jbd2_journal_get_create_access(handle, bh);
|
|
if (err)
|
|
ext4_journal_abort_handle(where, __func__, bh,
|
|
handle, err);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
|
|
struct inode *inode, struct buffer_head *bh)
|
|
{
|
|
int err = 0;
|
|
|
|
if (ext4_handle_valid(handle)) {
|
|
err = jbd2_journal_dirty_metadata(handle, bh);
|
|
if (err)
|
|
ext4_journal_abort_handle(where, __func__, bh,
|
|
handle, err);
|
|
} else {
|
|
if (inode && bh)
|
|
mark_buffer_dirty_inode(bh, inode);
|
|
else
|
|
mark_buffer_dirty(bh);
|
|
if (inode && inode_needs_sync(inode)) {
|
|
sync_dirty_buffer(bh);
|
|
if (buffer_req(bh) && !buffer_uptodate(bh)) {
|
|
ext4_error(inode->i_sb, __func__,
|
|
"IO error syncing inode, "
|
|
"inode=%lu, block=%llu",
|
|
inode->i_ino,
|
|
(unsigned long long) bh->b_blocknr);
|
|
err = -EIO;
|
|
}
|
|
}
|
|
}
|
|
return err;
|
|
}
|