[mirror_ubuntu-jammy-kernel.git] / fs / ext4 / ext4_jbd2.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Interface between ext4 and JBD
 */

#include "ext4_jbd2.h"

#include <trace/events/ext4.h>

int ext4_inode_journal_mode(struct inode *inode)
{
	if (EXT4_JOURNAL(inode) == NULL)
		return EXT4_INODE_WRITEBACK_DATA_MODE;	/* writeback */
	/* We do not support data journalling with delayed allocation */
	if (!S_ISREG(inode->i_mode) ||
	    ext4_test_inode_flag(inode, EXT4_INODE_EA_INODE) ||
	    test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
	    (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) &&
	    !test_opt(inode->i_sb, DELALLOC))) {
		/* We do not support data journalling for encrypted data */
		if (S_ISREG(inode->i_mode) && IS_ENCRYPTED(inode))
			return EXT4_INODE_ORDERED_DATA_MODE;  /* ordered */
		return EXT4_INODE_JOURNAL_DATA_MODE;	/* journal data */
	}
	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
		return EXT4_INODE_ORDERED_DATA_MODE;	/* ordered */
	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
		return EXT4_INODE_WRITEBACK_DATA_MODE;	/* writeback */
	BUG();
}

/* Just increment the non-pointer handle value */
static handle_t *ext4_get_nojournal(void)
{
	handle_t *handle = current->journal_info;
	unsigned long ref_cnt = (unsigned long)handle;

	BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);

	ref_cnt++;
	handle = (handle_t *)ref_cnt;

	current->journal_info = handle;
	return handle;
}


/* Decrement the non-pointer handle value */
static void ext4_put_nojournal(handle_t *handle)
{
	unsigned long ref_cnt = (unsigned long)handle;

	BUG_ON(ref_cnt == 0);

	ref_cnt--;
	handle = (handle_t *)ref_cnt;

	current->journal_info = handle;
}

/*
 * Wrappers for jbd2_journal_start/end.
 */
static int ext4_journal_check_start(struct super_block *sb)
{
	journal_t *journal;

	might_sleep();

	if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
		return -EIO;

	if (sb_rdonly(sb))
		return -EROFS;
	WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
	journal = EXT4_SB(sb)->s_journal;
	/*
	 * Special case here: if the journal has aborted behind our
	 * backs (eg. EIO in the commit thread), then we still need to
	 * take the FS itself readonly cleanly.
	 */
	if (journal && is_journal_aborted(journal)) {
		ext4_abort(sb, -journal->j_errno, "Detected aborted journal");
		return -EROFS;
	}
	return 0;
}

handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line,
				  int type, int blocks, int rsv_blocks,
				  int revoke_creds)
{
	journal_t *journal;
	int err;

	trace_ext4_journal_start(sb, blocks, rsv_blocks, revoke_creds,
				 _RET_IP_);
	err = ext4_journal_check_start(sb);
	if (err < 0)
		return ERR_PTR(err);

	journal = EXT4_SB(sb)->s_journal;
	if (!journal || (EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY))
		return ext4_get_nojournal();
	return jbd2__journal_start(journal, blocks, rsv_blocks, revoke_creds,
				   GFP_NOFS, type, line);
}

int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
{
	struct super_block *sb;
	int err;
	int rc;

	if (!ext4_handle_valid(handle)) {
		ext4_put_nojournal(handle);
		return 0;
	}

	err = handle->h_err;
	if (!handle->h_transaction) {
		rc = jbd2_journal_stop(handle);
		return err ? err : rc;
	}

	sb = handle->h_transaction->t_journal->j_private;
	rc = jbd2_journal_stop(handle);

	if (!err)
		err = rc;
	if (err)
		__ext4_std_error(sb, where, line, err);
	return err;
}

handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line,
					int type)
{
	struct super_block *sb;
	int err;

	if (!ext4_handle_valid(handle))
		return ext4_get_nojournal();

	sb = handle->h_journal->j_private;
	trace_ext4_journal_start_reserved(sb,
				jbd2_handle_buffer_credits(handle), _RET_IP_);
	err = ext4_journal_check_start(sb);
	if (err < 0) {
		jbd2_journal_free_reserved(handle);
		return ERR_PTR(err);
	}

	err = jbd2_journal_start_reserved(handle, type, line);
	if (err < 0)
		return ERR_PTR(err);
	return handle;
}

int __ext4_journal_ensure_credits(handle_t *handle, int check_cred,
				  int extend_cred, int revoke_cred)
{
	if (!ext4_handle_valid(handle))
		return 0;
	if (is_handle_aborted(handle))
		return -EROFS;
	if (jbd2_handle_buffer_credits(handle) >= check_cred &&
	    handle->h_revoke_credits >= revoke_cred)
		return 0;
	extend_cred = max(0, extend_cred - jbd2_handle_buffer_credits(handle));
	revoke_cred = max(0, revoke_cred - handle->h_revoke_credits);
	return ext4_journal_extend(handle, extend_cred, revoke_cred);
}

static void ext4_journal_abort_handle(const char *caller, unsigned int line,
				      const char *err_fn,
				      struct buffer_head *bh,
				      handle_t *handle, int err)
{
	char nbuf[16];
	const char *errstr = ext4_decode_error(NULL, err, nbuf);

	BUG_ON(!ext4_handle_valid(handle));

	if (bh)
		BUFFER_TRACE(bh, "abort");

	if (!handle->h_err)
		handle->h_err = err;

	if (is_handle_aborted(handle))
		return;

	printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
	       caller, line, errstr, err_fn);

	jbd2_journal_abort_handle(handle);
}

static void ext4_check_bdev_write_error(struct super_block *sb)
{
	struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	int err;

	/*
	 * If the block device has write error flag, it may have failed to
	 * async write out metadata buffers in the background. In this case,
	 * we could read old data from disk and write it out again, which
	 * may lead to on-disk filesystem inconsistency.
	 */
	if (errseq_check(&mapping->wb_err, READ_ONCE(sbi->s_bdev_wb_err))) {
		spin_lock(&sbi->s_bdev_wb_lock);
		err = errseq_check_and_advance(&mapping->wb_err, &sbi->s_bdev_wb_err);
		spin_unlock(&sbi->s_bdev_wb_lock);
		if (err)
			ext4_error_err(sb, -err,
				       "Error while async write back metadata");
	}
}

int __ext4_journal_get_write_access(const char *where, unsigned int line,
				    handle_t *handle, struct super_block *sb,
				    struct buffer_head *bh,
				    enum ext4_journal_trigger_type trigger_type)
{
	int err;

	might_sleep();

	if (bh->b_bdev->bd_super)
		ext4_check_bdev_write_error(bh->b_bdev->bd_super);

	if (ext4_handle_valid(handle)) {
		err = jbd2_journal_get_write_access(handle, bh);
		if (err) {
			ext4_journal_abort_handle(where, line, __func__, bh,
						  handle, err);
			return err;
		}
	}
	if (trigger_type == EXT4_JTR_NONE || !ext4_has_metadata_csum(sb))
		return 0;
	BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT);
	jbd2_journal_set_triggers(bh,
		&EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers);
	return 0;
}

/*
 * 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.
 */
int __ext4_forget(const char *where, unsigned int line, 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, line, __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, line, __func__,
					  bh, handle, err);
		__ext4_error(inode->i_sb, where, line, true, -err, 0,
			     "error %d when attempting revoke", err);
	}
	BUFFER_TRACE(bh, "exit");
	return err;
}

int __ext4_journal_get_create_access(const char *where, unsigned int line,
				handle_t *handle, struct super_block *sb,
				struct buffer_head *bh,
				enum ext4_journal_trigger_type trigger_type)
{
	int err;

	if (!ext4_handle_valid(handle))
		return 0;

	err = jbd2_journal_get_create_access(handle, bh);
	if (err) {
		ext4_journal_abort_handle(where, line, __func__, bh, handle,
					  err);
		return err;
	}
	if (trigger_type == EXT4_JTR_NONE || !ext4_has_metadata_csum(sb))
		return 0;
	BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT);
	jbd2_journal_set_triggers(bh,
		&EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers);
	return 0;
}

int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
				 handle_t *handle, struct inode *inode,
				 struct buffer_head *bh)
{
	int err = 0;

	might_sleep();

	set_buffer_meta(bh);
	set_buffer_prio(bh);
	set_buffer_uptodate(bh);
	if (ext4_handle_valid(handle)) {
		err = jbd2_journal_dirty_metadata(handle, bh);
		/* Errors can only happen due to aborted journal or a nasty bug */
		if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) {
			ext4_journal_abort_handle(where, line, __func__, bh,
						  handle, err);
			if (inode == NULL) {
				pr_err("EXT4: jbd2_journal_dirty_metadata "
				       "failed: handle type %u started at "
				       "line %u, credits %u/%u, errcode %d",
				       handle->h_type,
				       handle->h_line_no,
				       handle->h_requested_credits,
				       jbd2_handle_buffer_credits(handle), err);
				return err;
			}
			ext4_error_inode(inode, where, line,
					 bh->b_blocknr,
					 "journal_dirty_metadata failed: "
					 "handle type %u started at line %u, "
					 "credits %u/%u, errcode %d",
					 handle->h_type,
					 handle->h_line_no,
					 handle->h_requested_credits,
					 jbd2_handle_buffer_credits(handle),
					 err);
		}
	} else {
		if (inode)
			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_err(inode, where, line,
						     bh->b_blocknr, EIO,
					"IO error syncing itable block");
				err = -EIO;
			}
		}
	}
	return err;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
8984d137 AM	2	/*
	3	* Interface between ext4 and JBD
	4	*/
	5
3dcf5451	6	#include "ext4_jbd2.h"
8984d137	7
d6797d14 TT	8	#include <trace/events/ext4.h>
d6797d14 TT	9
46797ad7 EB	10	int ext4_inode_journal_mode(struct inode *inode)
	11	{
	12	if (EXT4_JOURNAL(inode) == NULL)
	13	return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
	14	/* We do not support data journalling with delayed allocation */
	15	if (!S_ISREG(inode->i_mode) \|\|
	16	ext4_test_inode_flag(inode, EXT4_INODE_EA_INODE) \|\|
	17	test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA \|\|
	18	(ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) &&
	19	!test_opt(inode->i_sb, DELALLOC))) {
	20	/* We do not support data journalling for encrypted data */
	21	if (S_ISREG(inode->i_mode) && IS_ENCRYPTED(inode))
	22	return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */
	23	return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */
	24	}
	25	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
	26	return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */
	27	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
	28	return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
	29	BUG();
	30	}
	31
722887dd TT	32	/* Just increment the non-pointer handle value */
	33	static handle_t *ext4_get_nojournal(void)
	34	{
	35	handle_t *handle = current->journal_info;
	36	unsigned long ref_cnt = (unsigned long)handle;
	37
	38	BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
	39
	40	ref_cnt++;
	41	handle = (handle_t *)ref_cnt;
	42
	43	current->journal_info = handle;
	44	return handle;
	45	}
	46
	47
	48	/* Decrement the non-pointer handle value */
	49	static void ext4_put_nojournal(handle_t *handle)
	50	{
	51	unsigned long ref_cnt = (unsigned long)handle;
	52
	53	BUG_ON(ref_cnt == 0);
	54
	55	ref_cnt--;
	56	handle = (handle_t *)ref_cnt;
	57
	58	current->journal_info = handle;
	59	}
	60
	61	/*
	62	* Wrappers for jbd2_journal_start/end.
	63	*/
5fe2fe89	64	static int ext4_journal_check_start(struct super_block *sb)
722887dd TT	65	{
	66	journal_t *journal;
	67
b10a44c3	68	might_sleep();
0db1ff22 TT	69
	70	if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
	71	return -EIO;
	72
bc98a42c	73	if (sb_rdonly(sb))
5fe2fe89	74	return -EROFS;
722887dd TT	75	WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
722887dd TT	76	journal = EXT4_SB(sb)->s_journal;
722887dd TT	77	/*
	78	* Special case here: if the journal has aborted behind our
	79	* backs (eg. EIO in the commit thread), then we still need to
	80	* take the FS itself readonly cleanly.
	81	*/
5fe2fe89	82	if (journal && is_journal_aborted(journal)) {
54d3adbc	83	ext4_abort(sb, -journal->j_errno, "Detected aborted journal");
5fe2fe89	84	return -EROFS;
722887dd	85	}
5fe2fe89 JK	86	return 0;
	87	}
	88
	89	handle_t __ext4_journal_start_sb(struct super_block sb, unsigned int line,
83448bdf JK	90	int type, int blocks, int rsv_blocks,
83448bdf JK	91	int revoke_creds)
5fe2fe89 JK	92	{
	93	journal_t *journal;
	94	int err;
	95
83448bdf JK	96	trace_ext4_journal_start(sb, blocks, rsv_blocks, revoke_creds,
83448bdf JK	97	_RET_IP_);
5fe2fe89 JK	98	err = ext4_journal_check_start(sb);
	99	if (err < 0)
	100	return ERR_PTR(err);
	101
	102	journal = EXT4_SB(sb)->s_journal;
8016e29f	103	if (!journal \|\| (EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY))
5fe2fe89	104	return ext4_get_nojournal();
83448bdf JK	105	return jbd2__journal_start(journal, blocks, rsv_blocks, revoke_creds,
83448bdf JK	106	GFP_NOFS, type, line);
722887dd TT	107	}
	108
	109	int __ext4_journal_stop(const char where, unsigned int line, handle_t handle)
	110	{
	111	struct super_block *sb;
	112	int err;
	113	int rc;
	114
	115	if (!ext4_handle_valid(handle)) {
	116	ext4_put_nojournal(handle);
	117	return 0;
	118	}
9d506594	119
6934da92	120	err = handle->h_err;
9d506594	121	if (!handle->h_transaction) {
6934da92 LC	122	rc = jbd2_journal_stop(handle);
6934da92 LC	123	return err ? err : rc;
9d506594 LC	124	}
9d506594 LC	125
722887dd	126	sb = handle->h_transaction->t_journal->j_private;
722887dd TT	127	rc = jbd2_journal_stop(handle);
	128
	129	if (!err)
	130	err = rc;
	131	if (err)
	132	__ext4_std_error(sb, where, line, err);
	133	return err;
	134	}
	135
5fe2fe89 JK	136	handle_t __ext4_journal_start_reserved(handle_t handle, unsigned int line,
	137	int type)
	138	{
	139	struct super_block *sb;
	140	int err;
	141
	142	if (!ext4_handle_valid(handle))
	143	return ext4_get_nojournal();
	144
	145	sb = handle->h_journal->j_private;
a9a8344e JK	146	trace_ext4_journal_start_reserved(sb,
a9a8344e JK	147	jbd2_handle_buffer_credits(handle), _RET_IP_);
5fe2fe89 JK	148	err = ext4_journal_check_start(sb);
	149	if (err < 0) {
	150	jbd2_journal_free_reserved(handle);
	151	return ERR_PTR(err);
	152	}
	153
	154	err = jbd2_journal_start_reserved(handle, type, line);
	155	if (err < 0)
	156	return ERR_PTR(err);
	157	return handle;
	158	}
	159
a4130367	160	int __ext4_journal_ensure_credits(handle_t *handle, int check_cred,
83448bdf	161	int extend_cred, int revoke_cred)
a4130367 JK	162	{
	163	if (!ext4_handle_valid(handle))
	164	return 0;
f8db10c0 YB	165	if (is_handle_aborted(handle))
f8db10c0 YB	166	return -EROFS;
83448bdf JK	167	if (jbd2_handle_buffer_credits(handle) >= check_cred &&
83448bdf JK	168	handle->h_revoke_credits >= revoke_cred)
a4130367	169	return 0;
83448bdf JK	170	extend_cred = max(0, extend_cred - jbd2_handle_buffer_credits(handle));
	171	revoke_cred = max(0, revoke_cred - handle->h_revoke_credits);
	172	return ext4_journal_extend(handle, extend_cred, revoke_cred);
a4130367 JK	173	}
a4130367 JK	174
c197855e SH	175	static void ext4_journal_abort_handle(const char *caller, unsigned int line,
	176	const char *err_fn,
	177	struct buffer_head *bh,
	178	handle_t *handle, int err)
722887dd TT	179	{
	180	char nbuf[16];
	181	const char *errstr = ext4_decode_error(NULL, err, nbuf);
	182
	183	BUG_ON(!ext4_handle_valid(handle));
	184
	185	if (bh)
	186	BUFFER_TRACE(bh, "abort");
	187
	188	if (!handle->h_err)
	189	handle->h_err = err;
	190
	191	if (is_handle_aborted(handle))
	192	return;
	193
	194	printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
	195	caller, line, errstr, err_fn);
	196
	197	jbd2_journal_abort_handle(handle);
	198	}
	199
bc71726c	200	static void ext4_check_bdev_write_error(struct super_block *sb)
	201	{
	202	struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
	203	struct ext4_sb_info *sbi = EXT4_SB(sb);
	204	int err;
	205
	206	/*
	207	* If the block device has write error flag, it may have failed to
	208	* async write out metadata buffers in the background. In this case,
	209	* we could read old data from disk and write it out again, which
	210	* may lead to on-disk filesystem inconsistency.
	211	*/
	212	if (errseq_check(&mapping->wb_err, READ_ONCE(sbi->s_bdev_wb_err))) {
	213	spin_lock(&sbi->s_bdev_wb_lock);
	214	err = errseq_check_and_advance(&mapping->wb_err, &sbi->s_bdev_wb_err);
	215	spin_unlock(&sbi->s_bdev_wb_lock);
	216	if (err)
	217	ext4_error_err(sb, -err,
	218	"Error while async write back metadata");
	219	}
	220	}
	221
90c7201b	222	int __ext4_journal_get_write_access(const char *where, unsigned int line,
188c299e JK	223	handle_t handle, struct super_block sb,
	224	struct buffer_head *bh,
	225	enum ext4_journal_trigger_type trigger_type)
8984d137	226	{
188c299e	227	int err;
0390131b	228
b10a44c3 TT	229	might_sleep();
b10a44c3 TT	230
bc71726c	231	if (bh->b_bdev->bd_super)
	232	ext4_check_bdev_write_error(bh->b_bdev->bd_super);
	233
0390131b FM	234	if (ext4_handle_valid(handle)) {
0390131b FM	235	err = jbd2_journal_get_write_access(handle, bh);
188c299e	236	if (err) {
90c7201b	237	ext4_journal_abort_handle(where, line, __func__, bh,
0390131b	238	handle, err);
188c299e JK	239	return err;
188c299e JK	240	}
0390131b	241	}
188c299e JK	242	if (trigger_type == EXT4_JTR_NONE \|\| !ext4_has_metadata_csum(sb))
	243	return 0;
	244	BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT);
	245	jbd2_journal_set_triggers(bh,
	246	&EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers);
	247	return 0;
8984d137 AM	248	}
8984d137 AM	249
d6797d14 TT	250	/*
	251	* The ext4 forget function must perform a revoke if we are freeing data
	252	* which has been journaled. Metadata (eg. indirect blocks) must be
	253	* revoked in all cases.
	254	*
	255	* "bh" may be NULL: a metadata block may have been freed from memory
	256	* but there may still be a record of it in the journal, and that record
	257	* still needs to be revoked.
d6797d14	258	*/
90c7201b TT	259	int __ext4_forget(const char where, unsigned int line, handle_t handle,
	260	int is_metadata, struct inode *inode,
	261	struct buffer_head *bh, ext4_fsblk_t blocknr)
d6797d14 TT	262	{
	263	int err;
	264
	265	might_sleep();
	266
	267	trace_ext4_forget(inode, is_metadata, blocknr);
	268	BUFFER_TRACE(bh, "enter");
	269
	270	jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
	271	"data mode %x\n",
	272	bh, is_metadata, inode->i_mode,
	273	test_opt(inode->i_sb, DATA_FLAGS));
	274
e4684b3f TT	275	/* In the no journal case, we can just do a bforget and return */
	276	if (!ext4_handle_valid(handle)) {
	277	bforget(bh);
	278	return 0;
	279	}
	280
d6797d14 TT	281	/* Never use the revoke function if we are doing full data
	282	* journaling: there is no need to, and a V1 superblock won't
	283	* support it. Otherwise, only skip the revoke on un-journaled
	284	* data blocks. */
	285
	286	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA \|\|
	287	(!is_metadata && !ext4_should_journal_data(inode))) {
	288	if (bh) {
	289	BUFFER_TRACE(bh, "call jbd2_journal_forget");
b7e57e7c TT	290	err = jbd2_journal_forget(handle, bh);
b7e57e7c TT	291	if (err)
90c7201b TT	292	ext4_journal_abort_handle(where, line, __func__,
90c7201b TT	293	bh, handle, err);
b7e57e7c	294	return err;
d6797d14 TT	295	}
	296	return 0;
	297	}
	298
	299	/*
	300	* data!=journal && (is_metadata \|\| should_journal_data(inode))
	301	*/
e4684b3f TT	302	BUFFER_TRACE(bh, "call jbd2_journal_revoke");
	303	err = jbd2_journal_revoke(handle, blocknr, bh);
	304	if (err) {
90c7201b TT	305	ext4_journal_abort_handle(where, line, __func__,
90c7201b TT	306	bh, handle, err);
014c9caa JK	307	__ext4_error(inode->i_sb, where, line, true, -err, 0,
014c9caa JK	308	"error %d when attempting revoke", err);
e4684b3f	309	}
d6797d14 TT	310	BUFFER_TRACE(bh, "exit");
	311	return err;
	312	}
	313
90c7201b	314	int __ext4_journal_get_create_access(const char *where, unsigned int line,
188c299e JK	315	handle_t handle, struct super_block sb,
	316	struct buffer_head *bh,
	317	enum ext4_journal_trigger_type trigger_type)
8984d137	318	{
188c299e	319	int err;
0390131b	320
188c299e JK	321	if (!ext4_handle_valid(handle))
	322	return 0;
	323
	324	err = jbd2_journal_get_create_access(handle, bh);
	325	if (err) {
	326	ext4_journal_abort_handle(where, line, __func__, bh, handle,
	327	err);
	328	return err;
0390131b	329	}
188c299e JK	330	if (trigger_type == EXT4_JTR_NONE \|\| !ext4_has_metadata_csum(sb))
	331	return 0;
	332	BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT);
	333	jbd2_journal_set_triggers(bh,
	334	&EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers);
	335	return 0;
8984d137 AM	336	}
8984d137 AM	337
90c7201b TT	338	int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
	339	handle_t handle, struct inode inode,
	340	struct buffer_head *bh)
8984d137	341	{
0390131b FM	342	int err = 0;
0390131b FM	343
b10a44c3 TT	344	might_sleep();
b10a44c3 TT	345
13fca323 TT	346	set_buffer_meta(bh);
13fca323 TT	347	set_buffer_prio(bh);
558d6450	348	set_buffer_uptodate(bh);
0390131b FM	349	if (ext4_handle_valid(handle)) {
0390131b FM	350	err = jbd2_journal_dirty_metadata(handle, bh);
c5d31192 DM	351	/* Errors can only happen due to aborted journal or a nasty bug */
c5d31192 DM	352	if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) {
91aa11fa JK	353	ext4_journal_abort_handle(where, line, __func__, bh,
91aa11fa JK	354	handle, err);
66a4cb18 TT	355	if (inode == NULL) {
	356	pr_err("EXT4: jbd2_journal_dirty_metadata "
	357	"failed: handle type %u started at "
	358	"line %u, credits %u/%u, errcode %d",
	359	handle->h_type,
	360	handle->h_line_no,
	361	handle->h_requested_credits,
a9a8344e	362	jbd2_handle_buffer_credits(handle), err);
66a4cb18 TT	363	return err;
66a4cb18 TT	364	}
ae1495b1 TT	365	ext4_error_inode(inode, where, line,
	366	bh->b_blocknr,
	367	"journal_dirty_metadata failed: "
	368	"handle type %u started at line %u, "
	369	"credits %u/%u, errcode %d",
	370	handle->h_type,
	371	handle->h_line_no,
	372	handle->h_requested_credits,
a9a8344e JK	373	jbd2_handle_buffer_credits(handle),
a9a8344e JK	374	err);
9ea7a0df	375	}
0390131b	376	} else {
73b50c1c	377	if (inode)
fe188c0e TT	378	mark_buffer_dirty_inode(bh, inode);
	379	else
	380	mark_buffer_dirty(bh);
0390131b FM	381	if (inode && inode_needs_sync(inode)) {
	382	sync_dirty_buffer(bh);
	383	if (buffer_req(bh) && !buffer_uptodate(bh)) {
54d3adbc TT	384	ext4_error_inode_err(inode, where, line,
54d3adbc TT	385	bh->b_blocknr, EIO,
c398eda0	386	"IO error syncing itable block");
0390131b FM	387	err = -EIO;
	388	}
	389	}
	390	}
8984d137 AM	391	return err;
8984d137 AM	392	}