ext4: move __func__ into a macro for ext4_warning, ext4_error
[linux-2.6.git] / fs / ext4 / ext4_jbd2.c
1 /*
2  * Interface between ext4 and JBD
3  */
4
5 #include "ext4_jbd2.h"
6
7 #include <trace/events/ext4.h>
8
9 int __ext4_journal_get_undo_access(const char *where, handle_t *handle,
10                                 struct buffer_head *bh)
11 {
12         int err = 0;
13
14         if (ext4_handle_valid(handle)) {
15                 err = jbd2_journal_get_undo_access(handle, bh);
16                 if (err)
17                         ext4_journal_abort_handle(where, __func__, bh,
18                                                   handle, err);
19         }
20         return err;
21 }
22
23 int __ext4_journal_get_write_access(const char *where, handle_t *handle,
24                                 struct buffer_head *bh)
25 {
26         int err = 0;
27
28         if (ext4_handle_valid(handle)) {
29                 err = jbd2_journal_get_write_access(handle, bh);
30                 if (err)
31                         ext4_journal_abort_handle(where, __func__, bh,
32                                                   handle, err);
33         }
34         return err;
35 }
36
37 /*
38  * The ext4 forget function must perform a revoke if we are freeing data
39  * which has been journaled.  Metadata (eg. indirect blocks) must be
40  * revoked in all cases.
41  *
42  * "bh" may be NULL: a metadata block may have been freed from memory
43  * but there may still be a record of it in the journal, and that record
44  * still needs to be revoked.
45  *
46  * If the handle isn't valid we're not journaling, but we still need to
47  * call into ext4_journal_revoke() to put the buffer head.
48  */
49 int __ext4_forget(const char *where, handle_t *handle, int is_metadata,
50                   struct inode *inode, struct buffer_head *bh,
51                   ext4_fsblk_t blocknr)
52 {
53         int err;
54
55         might_sleep();
56
57         trace_ext4_forget(inode, is_metadata, blocknr);
58         BUFFER_TRACE(bh, "enter");
59
60         jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
61                   "data mode %x\n",
62                   bh, is_metadata, inode->i_mode,
63                   test_opt(inode->i_sb, DATA_FLAGS));
64
65         /* In the no journal case, we can just do a bforget and return */
66         if (!ext4_handle_valid(handle)) {
67                 bforget(bh);
68                 return 0;
69         }
70
71         /* Never use the revoke function if we are doing full data
72          * journaling: there is no need to, and a V1 superblock won't
73          * support it.  Otherwise, only skip the revoke on un-journaled
74          * data blocks. */
75
76         if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
77             (!is_metadata && !ext4_should_journal_data(inode))) {
78                 if (bh) {
79                         BUFFER_TRACE(bh, "call jbd2_journal_forget");
80                         err = jbd2_journal_forget(handle, bh);
81                         if (err)
82                                 ext4_journal_abort_handle(where, __func__, bh,
83                                                           handle, err);
84                         return err;
85                 }
86                 return 0;
87         }
88
89         /*
90          * data!=journal && (is_metadata || should_journal_data(inode))
91          */
92         BUFFER_TRACE(bh, "call jbd2_journal_revoke");
93         err = jbd2_journal_revoke(handle, blocknr, bh);
94         if (err) {
95                 ext4_journal_abort_handle(where, __func__, bh, handle, err);
96                 ext4_abort(inode->i_sb, __func__,
97                            "error %d when attempting revoke", err);
98         }
99         BUFFER_TRACE(bh, "exit");
100         return err;
101 }
102
103 int __ext4_journal_get_create_access(const char *where,
104                                 handle_t *handle, struct buffer_head *bh)
105 {
106         int err = 0;
107
108         if (ext4_handle_valid(handle)) {
109                 err = jbd2_journal_get_create_access(handle, bh);
110                 if (err)
111                         ext4_journal_abort_handle(where, __func__, bh,
112                                                   handle, err);
113         }
114         return err;
115 }
116
117 int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
118                                  struct inode *inode, struct buffer_head *bh)
119 {
120         int err = 0;
121
122         if (ext4_handle_valid(handle)) {
123                 err = jbd2_journal_dirty_metadata(handle, bh);
124                 if (err)
125                         ext4_journal_abort_handle(where, __func__, bh,
126                                                   handle, err);
127         } else {
128                 if (inode && bh)
129                         mark_buffer_dirty_inode(bh, inode);
130                 else
131                         mark_buffer_dirty(bh);
132                 if (inode && inode_needs_sync(inode)) {
133                         sync_dirty_buffer(bh);
134                         if (buffer_req(bh) && !buffer_uptodate(bh)) {
135                                 ext4_error(inode->i_sb,
136                                            "IO error syncing inode, "
137                                            "inode=%lu, block=%llu",
138                                            inode->i_ino,
139                                            (unsigned long long) bh->b_blocknr);
140                                 err = -EIO;
141                         }
142                 }
143         }
144         return err;
145 }