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1/*
2 * Interface between ext4 and JBD
3 */
4
5#include "ext4_jbd2.h"
6
7#include <trace/events/ext4.h>
8
9int __ext4_journal_get_write_access(const char *where, unsigned int line,
10 handle_t *handle, struct buffer_head *bh)
11{
12 int err = 0;
13
14 if (ext4_handle_valid(handle)) {
15 err = jbd2_journal_get_write_access(handle, bh);
16 if (err)
17 ext4_journal_abort_handle(where, line, __func__, bh,
18 handle, err);
19 }
20 return err;
21}
22
23/*
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 */
35int __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)
38{
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
51 /* 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
57 /* 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");
66 err = jbd2_journal_forget(handle, bh);
67 if (err)
68 ext4_journal_abort_handle(where, line, __func__,
69 bh, handle, err);
70 return err;
71 }
72 return 0;
73 }
74
75 /*
76 * data!=journal && (is_metadata || should_journal_data(inode))
77 */
78 BUFFER_TRACE(bh, "call jbd2_journal_revoke");
79 err = jbd2_journal_revoke(handle, blocknr, bh);
80 if (err) {
81 ext4_journal_abort_handle(where, line, __func__,
82 bh, handle, err);
83 __ext4_abort(inode->i_sb, where, line,
84 "error %d when attempting revoke", err);
85 }
86 BUFFER_TRACE(bh, "exit");
87 return err;
88}
89
90int __ext4_journal_get_create_access(const char *where, unsigned int line,
91 handle_t *handle, struct buffer_head *bh)
92{
93 int err = 0;
94
95 if (ext4_handle_valid(handle)) {
96 err = jbd2_journal_get_create_access(handle, bh);
97 if (err)
98 ext4_journal_abort_handle(where, line, __func__,
99 bh, handle, err);
100 }
101 return err;
102}
103
104int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
105 handle_t *handle, struct inode *inode,
106 struct buffer_head *bh)
107{
108 int err = 0;
109
110 if (ext4_handle_valid(handle)) {
111 err = jbd2_journal_dirty_metadata(handle, bh);
112 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 }
117 } else {
118 if (inode)
119 mark_buffer_dirty_inode(bh, inode);
120 else
121 mark_buffer_dirty(bh);
122 if (inode && inode_needs_sync(inode)) {
123 sync_dirty_buffer(bh);
124 if (buffer_req(bh) && !buffer_uptodate(bh)) {
125 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);
130 ext4_error_inode(inode, where, line,
131 bh->b_blocknr,
132 "IO error syncing itable block");
133 err = -EIO;
134 }
135 }
136 }
137 return err;
138}
139
140int __ext4_handle_dirty_super(const char *where, unsigned int line,
141 handle_t *handle, struct super_block *sb,
142 int now)
143{
144 struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
145 int err = 0;
146
147 if (ext4_handle_valid(handle)) {
148 ext4_superblock_csum_set(sb,
149 (struct ext4_super_block *)bh->b_data);
150 err = jbd2_journal_dirty_metadata(handle, bh);
151 if (err)
152 ext4_journal_abort_handle(where, line, __func__,
153 bh, handle, err);
154 } else if (now) {
155 ext4_superblock_csum_set(sb,
156 (struct ext4_super_block *)bh->b_data);
157 mark_buffer_dirty(bh);
158 } else
159 sb->s_dirt = 1;
160 return err;
161}
1/*
2 * Interface between ext4 and JBD
3 */
4
5#include "ext4_jbd2.h"
6
7#include <trace/events/ext4.h>
8
9int __ext4_journal_get_write_access(const char *where, unsigned int line,
10 handle_t *handle, struct buffer_head *bh)
11{
12 int err = 0;
13
14 if (ext4_handle_valid(handle)) {
15 err = jbd2_journal_get_write_access(handle, bh);
16 if (err)
17 ext4_journal_abort_handle(where, line, __func__, bh,
18 handle, err);
19 }
20 return err;
21}
22
23/*
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 */
35int __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)
38{
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
51 /* 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
57 /* 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");
66 err = jbd2_journal_forget(handle, bh);
67 if (err)
68 ext4_journal_abort_handle(where, line, __func__,
69 bh, handle, err);
70 return err;
71 }
72 return 0;
73 }
74
75 /*
76 * data!=journal && (is_metadata || should_journal_data(inode))
77 */
78 BUFFER_TRACE(bh, "call jbd2_journal_revoke");
79 err = jbd2_journal_revoke(handle, blocknr, bh);
80 if (err) {
81 ext4_journal_abort_handle(where, line, __func__,
82 bh, handle, err);
83 __ext4_abort(inode->i_sb, where, line,
84 "error %d when attempting revoke", err);
85 }
86 BUFFER_TRACE(bh, "exit");
87 return err;
88}
89
90int __ext4_journal_get_create_access(const char *where, unsigned int line,
91 handle_t *handle, struct buffer_head *bh)
92{
93 int err = 0;
94
95 if (ext4_handle_valid(handle)) {
96 err = jbd2_journal_get_create_access(handle, bh);
97 if (err)
98 ext4_journal_abort_handle(where, line, __func__,
99 bh, handle, err);
100 }
101 return err;
102}
103
104int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
105 handle_t *handle, struct inode *inode,
106 struct buffer_head *bh)
107{
108 int err = 0;
109
110 if (ext4_handle_valid(handle)) {
111 err = jbd2_journal_dirty_metadata(handle, bh);
112 if (err)
113 ext4_journal_abort_handle(where, line, __func__,
114 bh, handle, err);
115 } else {
116 if (inode)
117 mark_buffer_dirty_inode(bh, inode);
118 else
119 mark_buffer_dirty(bh);
120 if (inode && inode_needs_sync(inode)) {
121 sync_dirty_buffer(bh);
122 if (buffer_req(bh) && !buffer_uptodate(bh)) {
123 struct ext4_super_block *es;
124
125 es = EXT4_SB(inode->i_sb)->s_es;
126 es->s_last_error_block =
127 cpu_to_le64(bh->b_blocknr);
128 ext4_error_inode(inode, where, line,
129 bh->b_blocknr,
130 "IO error syncing itable block");
131 err = -EIO;
132 }
133 }
134 }
135 return err;
136}
137
138int __ext4_handle_dirty_super(const char *where, unsigned int line,
139 handle_t *handle, struct super_block *sb)
140{
141 struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
142 int err = 0;
143
144 if (ext4_handle_valid(handle)) {
145 err = jbd2_journal_dirty_metadata(handle, bh);
146 if (err)
147 ext4_journal_abort_handle(where, line, __func__,
148 bh, handle, err);
149 } else
150 sb->s_dirt = 1;
151 return err;
152}