Andrew Morton | 8984d13 | 2006-12-06 20:37:15 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Interface between ext4 and JBD |
| 3 | */ |
| 4 | |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 5 | #include "ext4_jbd2.h" |
Andrew Morton | 8984d13 | 2006-12-06 20:37:15 -0800 | [diff] [blame] | 6 | |
Theodore Ts'o | d6797d1 | 2009-11-22 20:52:12 -0500 | [diff] [blame^] | 7 | #include <trace/events/ext4.h> |
| 8 | |
Andrew Morton | 8984d13 | 2006-12-06 20:37:15 -0800 | [diff] [blame] | 9 | int __ext4_journal_get_undo_access(const char *where, handle_t *handle, |
| 10 | struct buffer_head *bh) |
| 11 | { |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 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 | } |
Andrew Morton | 8984d13 | 2006-12-06 20:37:15 -0800 | [diff] [blame] | 20 | return err; |
| 21 | } |
| 22 | |
| 23 | int __ext4_journal_get_write_access(const char *where, handle_t *handle, |
| 24 | struct buffer_head *bh) |
| 25 | { |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 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 | } |
Andrew Morton | 8984d13 | 2006-12-06 20:37:15 -0800 | [diff] [blame] | 34 | return err; |
| 35 | } |
| 36 | |
| 37 | int __ext4_journal_forget(const char *where, handle_t *handle, |
| 38 | struct buffer_head *bh) |
| 39 | { |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 40 | int err = 0; |
| 41 | |
| 42 | if (ext4_handle_valid(handle)) { |
| 43 | err = jbd2_journal_forget(handle, bh); |
| 44 | if (err) |
| 45 | ext4_journal_abort_handle(where, __func__, bh, |
| 46 | handle, err); |
| 47 | } |
Curt Wohlgemuth | e6b5d30 | 2009-07-13 09:07:20 -0400 | [diff] [blame] | 48 | else |
Theodore Ts'o | c7acb4c | 2009-09-09 21:32:41 -0400 | [diff] [blame] | 49 | bforget(bh); |
Andrew Morton | 8984d13 | 2006-12-06 20:37:15 -0800 | [diff] [blame] | 50 | return err; |
| 51 | } |
| 52 | |
| 53 | int __ext4_journal_revoke(const char *where, handle_t *handle, |
| 54 | ext4_fsblk_t blocknr, struct buffer_head *bh) |
| 55 | { |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 56 | int err = 0; |
| 57 | |
| 58 | if (ext4_handle_valid(handle)) { |
| 59 | err = jbd2_journal_revoke(handle, blocknr, bh); |
| 60 | if (err) |
| 61 | ext4_journal_abort_handle(where, __func__, bh, |
| 62 | handle, err); |
| 63 | } |
Curt Wohlgemuth | e6b5d30 | 2009-07-13 09:07:20 -0400 | [diff] [blame] | 64 | else |
Theodore Ts'o | c7acb4c | 2009-09-09 21:32:41 -0400 | [diff] [blame] | 65 | bforget(bh); |
Andrew Morton | 8984d13 | 2006-12-06 20:37:15 -0800 | [diff] [blame] | 66 | return err; |
| 67 | } |
| 68 | |
Theodore Ts'o | d6797d1 | 2009-11-22 20:52:12 -0500 | [diff] [blame^] | 69 | /* |
| 70 | * The ext4 forget function must perform a revoke if we are freeing data |
| 71 | * which has been journaled. Metadata (eg. indirect blocks) must be |
| 72 | * revoked in all cases. |
| 73 | * |
| 74 | * "bh" may be NULL: a metadata block may have been freed from memory |
| 75 | * but there may still be a record of it in the journal, and that record |
| 76 | * still needs to be revoked. |
| 77 | * |
| 78 | * If the handle isn't valid we're not journaling, but we still need to |
| 79 | * call into ext4_journal_revoke() to put the buffer head. |
| 80 | */ |
| 81 | int __ext4_forget(const char *where, handle_t *handle, int is_metadata, |
| 82 | struct inode *inode, struct buffer_head *bh, |
| 83 | ext4_fsblk_t blocknr) |
| 84 | { |
| 85 | int err; |
| 86 | |
| 87 | might_sleep(); |
| 88 | |
| 89 | trace_ext4_forget(inode, is_metadata, blocknr); |
| 90 | BUFFER_TRACE(bh, "enter"); |
| 91 | |
| 92 | jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, " |
| 93 | "data mode %x\n", |
| 94 | bh, is_metadata, inode->i_mode, |
| 95 | test_opt(inode->i_sb, DATA_FLAGS)); |
| 96 | |
| 97 | /* Never use the revoke function if we are doing full data |
| 98 | * journaling: there is no need to, and a V1 superblock won't |
| 99 | * support it. Otherwise, only skip the revoke on un-journaled |
| 100 | * data blocks. */ |
| 101 | |
| 102 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA || |
| 103 | (!is_metadata && !ext4_should_journal_data(inode))) { |
| 104 | if (bh) { |
| 105 | BUFFER_TRACE(bh, "call jbd2_journal_forget"); |
| 106 | return __ext4_journal_forget(where, handle, bh); |
| 107 | } |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | /* |
| 112 | * data!=journal && (is_metadata || should_journal_data(inode)) |
| 113 | */ |
| 114 | BUFFER_TRACE(bh, "call ext4_journal_revoke"); |
| 115 | err = __ext4_journal_revoke(where, handle, blocknr, bh); |
| 116 | if (err) |
| 117 | ext4_abort(inode->i_sb, __func__, |
| 118 | "error %d when attempting revoke", err); |
| 119 | BUFFER_TRACE(bh, "exit"); |
| 120 | return err; |
| 121 | } |
| 122 | |
Andrew Morton | 8984d13 | 2006-12-06 20:37:15 -0800 | [diff] [blame] | 123 | int __ext4_journal_get_create_access(const char *where, |
| 124 | handle_t *handle, struct buffer_head *bh) |
| 125 | { |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 126 | int err = 0; |
| 127 | |
| 128 | if (ext4_handle_valid(handle)) { |
| 129 | err = jbd2_journal_get_create_access(handle, bh); |
| 130 | if (err) |
| 131 | ext4_journal_abort_handle(where, __func__, bh, |
| 132 | handle, err); |
| 133 | } |
Andrew Morton | 8984d13 | 2006-12-06 20:37:15 -0800 | [diff] [blame] | 134 | return err; |
| 135 | } |
| 136 | |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 137 | int __ext4_handle_dirty_metadata(const char *where, handle_t *handle, |
| 138 | struct inode *inode, struct buffer_head *bh) |
Andrew Morton | 8984d13 | 2006-12-06 20:37:15 -0800 | [diff] [blame] | 139 | { |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 140 | int err = 0; |
| 141 | |
| 142 | if (ext4_handle_valid(handle)) { |
| 143 | err = jbd2_journal_dirty_metadata(handle, bh); |
| 144 | if (err) |
| 145 | ext4_journal_abort_handle(where, __func__, bh, |
| 146 | handle, err); |
| 147 | } else { |
Theodore Ts'o | fe188c0 | 2009-09-12 13:41:55 -0400 | [diff] [blame] | 148 | if (inode && bh) |
| 149 | mark_buffer_dirty_inode(bh, inode); |
| 150 | else |
| 151 | mark_buffer_dirty(bh); |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 152 | if (inode && inode_needs_sync(inode)) { |
| 153 | sync_dirty_buffer(bh); |
| 154 | if (buffer_req(bh) && !buffer_uptodate(bh)) { |
| 155 | ext4_error(inode->i_sb, __func__, |
| 156 | "IO error syncing inode, " |
| 157 | "inode=%lu, block=%llu", |
| 158 | inode->i_ino, |
| 159 | (unsigned long long) bh->b_blocknr); |
| 160 | err = -EIO; |
| 161 | } |
| 162 | } |
| 163 | } |
Andrew Morton | 8984d13 | 2006-12-06 20:37:15 -0800 | [diff] [blame] | 164 | return err; |
| 165 | } |