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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/linux/journal-head.h | |
download | linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/linux/journal-head.h')
-rw-r--r-- | include/linux/journal-head.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/include/linux/journal-head.h b/include/linux/journal-head.h new file mode 100644 index 000000000000..8a62d1e84b9b --- /dev/null +++ b/include/linux/journal-head.h @@ -0,0 +1,92 @@ +/* + * include/linux/journal-head.h + * + * buffer_head fields for JBD + * + * 27 May 2001 Andrew Morton <akpm@digeo.com> + * Created - pulled out of fs.h + */ + +#ifndef JOURNAL_HEAD_H_INCLUDED +#define JOURNAL_HEAD_H_INCLUDED + +typedef unsigned int tid_t; /* Unique transaction ID */ +typedef struct transaction_s transaction_t; /* Compound transaction type */ +struct buffer_head; + +struct journal_head { + /* + * Points back to our buffer_head. [jbd_lock_bh_journal_head()] + */ + struct buffer_head *b_bh; + + /* + * Reference count - see description in journal.c + * [jbd_lock_bh_journal_head()] + */ + int b_jcount; + + /* + * Journalling list for this buffer [jbd_lock_bh_state()] + */ + unsigned b_jlist; + + /* + * This flag signals the buffer has been modified by + * the currently running transaction + * [jbd_lock_bh_state()] + */ + unsigned b_modified; + + /* + * Copy of the buffer data frozen for writing to the log. + * [jbd_lock_bh_state()] + */ + char *b_frozen_data; + + /* + * Pointer to a saved copy of the buffer containing no uncommitted + * deallocation references, so that allocations can avoid overwriting + * uncommitted deletes. [jbd_lock_bh_state()] + */ + char *b_committed_data; + + /* + * Pointer to the compound transaction which owns this buffer's + * metadata: either the running transaction or the committing + * transaction (if there is one). Only applies to buffers on a + * transaction's data or metadata journaling list. + * [j_list_lock] [jbd_lock_bh_state()] + */ + transaction_t *b_transaction; + + /* + * Pointer to the running compound transaction which is currently + * modifying the buffer's metadata, if there was already a transaction + * committing it when the new transaction touched it. + * [t_list_lock] [jbd_lock_bh_state()] + */ + transaction_t *b_next_transaction; + + /* + * Doubly-linked list of buffers on a transaction's data, metadata or + * forget queue. [t_list_lock] [jbd_lock_bh_state()] + */ + struct journal_head *b_tnext, *b_tprev; + + /* + * Pointer to the compound transaction against which this buffer + * is checkpointed. Only dirty buffers can be checkpointed. + * [j_list_lock] + */ + transaction_t *b_cp_transaction; + + /* + * Doubly-linked list of buffers still remaining to be flushed + * before an old transaction can be checkpointed. + * [j_list_lock] + */ + struct journal_head *b_cpnext, *b_cpprev; +}; + +#endif /* JOURNAL_HEAD_H_INCLUDED */ |