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Andrew Morton8984d132006-12-06 20:37:15 -08001/*
2 * Interface between ext4 and JBD
3 */
4
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04005#include "ext4_jbd2.h"
Andrew Morton8984d132006-12-06 20:37:15 -08006
Theodore Ts'od6797d12009-11-22 20:52:12 -05007#include <trace/events/ext4.h>
8
Theodore Ts'o90c72012010-06-29 14:53:24 -04009int __ext4_journal_get_write_access(const char *where, unsigned int line,
10 handle_t *handle, struct buffer_head *bh)
Andrew Morton8984d132006-12-06 20:37:15 -080011{
Frank Mayhar03901312009-01-07 00:06:22 -050012 int err = 0;
13
14 if (ext4_handle_valid(handle)) {
15 err = jbd2_journal_get_write_access(handle, bh);
16 if (err)
Theodore Ts'o90c72012010-06-29 14:53:24 -040017 ext4_journal_abort_handle(where, line, __func__, bh,
Frank Mayhar03901312009-01-07 00:06:22 -050018 handle, err);
19 }
Andrew Morton8984d132006-12-06 20:37:15 -080020 return err;
21}
22
Theodore Ts'od6797d12009-11-22 20:52:12 -050023/*
24 * The ext4 forget function must perform a revoke if we are freeing data
25 * which has been journaled. Metadata (eg. indirect blocks) must be
26 * revoked in all cases.
27 *
28 * "bh" may be NULL: a metadata block may have been freed from memory
29 * but there may still be a record of it in the journal, and that record
30 * still needs to be revoked.
31 *
32 * If the handle isn't valid we're not journaling, but we still need to
33 * call into ext4_journal_revoke() to put the buffer head.
34 */
Theodore Ts'o90c72012010-06-29 14:53:24 -040035int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
36 int is_metadata, struct inode *inode,
37 struct buffer_head *bh, ext4_fsblk_t blocknr)
Theodore Ts'od6797d12009-11-22 20:52:12 -050038{
39 int err;
40
41 might_sleep();
42
43 trace_ext4_forget(inode, is_metadata, blocknr);
44 BUFFER_TRACE(bh, "enter");
45
46 jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
47 "data mode %x\n",
48 bh, is_metadata, inode->i_mode,
49 test_opt(inode->i_sb, DATA_FLAGS));
50
Theodore Ts'oe4684b32009-11-24 11:05:59 -050051 /* In the no journal case, we can just do a bforget and return */
52 if (!ext4_handle_valid(handle)) {
53 bforget(bh);
54 return 0;
55 }
56
Theodore Ts'od6797d12009-11-22 20:52:12 -050057 /* Never use the revoke function if we are doing full data
58 * journaling: there is no need to, and a V1 superblock won't
59 * support it. Otherwise, only skip the revoke on un-journaled
60 * data blocks. */
61
62 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
63 (!is_metadata && !ext4_should_journal_data(inode))) {
64 if (bh) {
65 BUFFER_TRACE(bh, "call jbd2_journal_forget");
Theodore Ts'ob7e57e72009-11-22 21:00:13 -050066 err = jbd2_journal_forget(handle, bh);
67 if (err)
Theodore Ts'o90c72012010-06-29 14:53:24 -040068 ext4_journal_abort_handle(where, line, __func__,
69 bh, handle, err);
Theodore Ts'ob7e57e72009-11-22 21:00:13 -050070 return err;
Theodore Ts'od6797d12009-11-22 20:52:12 -050071 }
72 return 0;
73 }
74
75 /*
76 * data!=journal && (is_metadata || should_journal_data(inode))
77 */
Theodore Ts'oe4684b32009-11-24 11:05:59 -050078 BUFFER_TRACE(bh, "call jbd2_journal_revoke");
79 err = jbd2_journal_revoke(handle, blocknr, bh);
80 if (err) {
Theodore Ts'o90c72012010-06-29 14:53:24 -040081 ext4_journal_abort_handle(where, line, __func__,
82 bh, handle, err);
Theodore Ts'oc398eda2010-07-27 11:56:40 -040083 __ext4_abort(inode->i_sb, where, line,
84 "error %d when attempting revoke", err);
Theodore Ts'oe4684b32009-11-24 11:05:59 -050085 }
Theodore Ts'od6797d12009-11-22 20:52:12 -050086 BUFFER_TRACE(bh, "exit");
87 return err;
88}
89
Theodore Ts'o90c72012010-06-29 14:53:24 -040090int __ext4_journal_get_create_access(const char *where, unsigned int line,
Andrew Morton8984d132006-12-06 20:37:15 -080091 handle_t *handle, struct buffer_head *bh)
92{
Frank Mayhar03901312009-01-07 00:06:22 -050093 int err = 0;
94
95 if (ext4_handle_valid(handle)) {
96 err = jbd2_journal_get_create_access(handle, bh);
97 if (err)
Theodore Ts'o90c72012010-06-29 14:53:24 -040098 ext4_journal_abort_handle(where, line, __func__,
99 bh, handle, err);
Frank Mayhar03901312009-01-07 00:06:22 -0500100 }
Andrew Morton8984d132006-12-06 20:37:15 -0800101 return err;
102}
103
Theodore Ts'o90c72012010-06-29 14:53:24 -0400104int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
105 handle_t *handle, struct inode *inode,
106 struct buffer_head *bh)
Andrew Morton8984d132006-12-06 20:37:15 -0800107{
Frank Mayhar03901312009-01-07 00:06:22 -0500108 int err = 0;
109
110 if (ext4_handle_valid(handle)) {
111 err = jbd2_journal_dirty_metadata(handle, bh);
Theodore Ts'o9ea7a0d2011-09-04 10:18:14 -0400112 if (err) {
113 /* Errors can only happen if there is a bug */
114 handle->h_err = err;
115 __ext4_journal_stop(where, line, handle);
116 }
Frank Mayhar03901312009-01-07 00:06:22 -0500117 } else {
Curt Wohlgemuth73b50c12010-02-16 15:06:29 -0500118 if (inode)
Theodore Ts'ofe188c02009-09-12 13:41:55 -0400119 mark_buffer_dirty_inode(bh, inode);
120 else
121 mark_buffer_dirty(bh);
Frank Mayhar03901312009-01-07 00:06:22 -0500122 if (inode && inode_needs_sync(inode)) {
123 sync_dirty_buffer(bh);
124 if (buffer_req(bh) && !buffer_uptodate(bh)) {
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400125 struct ext4_super_block *es;
126
127 es = EXT4_SB(inode->i_sb)->s_es;
128 es->s_last_error_block =
129 cpu_to_le64(bh->b_blocknr);
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400130 ext4_error_inode(inode, where, line,
131 bh->b_blocknr,
132 "IO error syncing itable block");
Frank Mayhar03901312009-01-07 00:06:22 -0500133 err = -EIO;
134 }
135 }
136 }
Andrew Morton8984d132006-12-06 20:37:15 -0800137 return err;
138}
Theodore Ts'oa0375152010-06-11 23:14:04 -0400139
Theodore Ts'o90c72012010-06-29 14:53:24 -0400140int __ext4_handle_dirty_super(const char *where, unsigned int line,
141 handle_t *handle, struct super_block *sb)
Theodore Ts'oa0375152010-06-11 23:14:04 -0400142{
143 struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
144 int err = 0;
145
146 if (ext4_handle_valid(handle)) {
147 err = jbd2_journal_dirty_metadata(handle, bh);
148 if (err)
Theodore Ts'o90c72012010-06-29 14:53:24 -0400149 ext4_journal_abort_handle(where, line, __func__,
150 bh, handle, err);
Theodore Ts'oa0375152010-06-11 23:14:04 -0400151 } else
152 sb->s_dirt = 1;
153 return err;
154}