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2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
/*
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* include/linux/journal-head.h
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*
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* buffer_head fields for JBD
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*
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* 27 May 2001 Andrew Morton
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* Created - pulled out of fs.h
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*/
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#ifndef JOURNAL_HEAD_H_INCLUDED
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#define JOURNAL_HEAD_H_INCLUDED
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typedef unsigned int tid_t; /* Unique transaction ID */
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typedef struct transaction_s transaction_t; /* Compound transaction type */
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struct buffer_head;
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struct journal_head {
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/*
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* Points back to our buffer_head. [jbd_lock_bh_journal_head()]
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*/
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struct buffer_head *b_bh;
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/*
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* Reference count - see description in journal.c
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* [jbd_lock_bh_journal_head()]
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*/
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int b_jcount;
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/*
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* Journalling list for this buffer [jbd_lock_bh_state()]
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* NOTE: We *cannot* combine this with b_modified into a bitfield
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* as gcc would then (which the C standard allows but which is
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* very unuseful) make 64-bit accesses to the bitfield and clobber
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* b_jcount if its update races with bitfield modification.
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*/
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unsigned b_jlist;
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/*
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* This flag signals the buffer has been modified by
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* the currently running transaction
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* [jbd_lock_bh_state()]
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*/
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unsigned b_modified;
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/*
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* Copy of the buffer data frozen for writing to the log.
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* [jbd_lock_bh_state()]
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*/
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char *b_frozen_data;
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/*
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* Pointer to a saved copy of the buffer containing no uncommitted
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* deallocation references, so that allocations can avoid overwriting
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* uncommitted deletes. [jbd_lock_bh_state()]
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*/
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char *b_committed_data;
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/*
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* Pointer to the compound transaction which owns this buffer's
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* metadata: either the running transaction or the committing
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* transaction (if there is one). Only applies to buffers on a
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* transaction's data or metadata journaling list.
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* [j_list_lock] [jbd_lock_bh_state()]
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* Either of these locks is enough for reading, both are needed for
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* changes.
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*/
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transaction_t *b_transaction;
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/*
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* Pointer to the running compound transaction which is currently
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* modifying the buffer's metadata, if there was already a transaction
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* committing it when the new transaction touched it.
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* [t_list_lock] [jbd_lock_bh_state()]
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*/
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transaction_t *b_next_transaction;
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/*
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* Doubly-linked list of buffers on a transaction's data, metadata or
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* forget queue. [t_list_lock] [jbd_lock_bh_state()]
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*/
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struct journal_head *b_tnext, *b_tprev;
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/*
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* Pointer to the compound transaction against which this buffer
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* is checkpointed. Only dirty buffers can be checkpointed.
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* [j_list_lock]
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*/
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transaction_t *b_cp_transaction;
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/*
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* Doubly-linked list of buffers still remaining to be flushed
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* before an old transaction can be checkpointed.
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* [j_list_lock]
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*/
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struct journal_head *b_cpnext, *b_cpprev;
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/* Trigger type */
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struct jbd2_buffer_trigger_type *b_triggers;
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/* Trigger type for the committing transaction's frozen data */
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struct jbd2_buffer_trigger_type *b_frozen_triggers;
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};
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#endif /* JOURNAL_HEAD_H_INCLUDED */
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