TRACE_BLOCK_TOUCH_BU(9) Block IO TRACE_BLOCK_TOUCH_BU(9)NAME
trace_block_touch_buffer - mark a buffer accessed
void trace_block_touch_buffer(struct buffer_head * bh);
buffer_head being touched
Called from touch_buffer.
Jason Baron <email@example.com>
William Cohen <firstname.lastname@example.org>
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 TRACE_BLOCK_TOUCH_BU(9)
Check Out this Related Man Page
JOURNAL_GET_UNDO_ACC(9) The Linux Journalling API JOURNAL_GET_UNDO_ACC(9)NAME
journal_get_undo_access - Notify intent to modify metadata with non-rewindable consequences
int journal_get_undo_access(handle_t * handle, struct buffer_head * bh);
buffer to undo
Sometimes there is a need to distinguish between metadata which has been committed to disk and that which has not. The ext3fs code uses
this for freeing and allocating space, we have to make sure that we do not reuse freed space until the deallocation has been committed,
since if we overwrote that space we would make the delete un-rewindable in case of a crash.
To deal with that, journal_get_undo_access requests write access to a buffer for parts of non-rewindable operations such as delete
operations on the bitmaps. The journaling code must keep a copy of the buffer's contents prior to the undo_access call until such time as
we know that the buffer has definitely been committed to disk.
We never need to know which transaction the committed data is part of, buffers touched here are guaranteed to be dirtied later and so will
be committed to a new transaction in due course, at which point we can discard the old committed data pointer.
Returns error number or 0 on success.
Roger Gammans <email@example.com>
Stephen Tweedie <firstname.lastname@example.org>
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 JOURNAL_GET_UNDO_ACC(9)
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