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journal_get_write_access(9) [centos man page]

JOURNAL_GET_WRITE_AC(9) 				     The Linux Journalling API					   JOURNAL_GET_WRITE_AC(9)

NAME
journal_get_write_access - notify intent to modify a buffer for metadata (not data) update. SYNOPSIS
int journal_get_write_access(handle_t * handle, struct buffer_head * bh); ARGUMENTS
handle transaction to add buffer modifications to bh bh to be used for metadata writes DESCRIPTION
Returns an error code or 0 on success. In full data journalling mode the buffer may be of type BJ_AsyncData, because we're writeing a buffer which is also part of a shared mapping. AUTHORS
Roger Gammans <rgammans@computer-surgery.co.uk> Author. Stephen Tweedie <sct@redhat.com> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 JOURNAL_GET_WRITE_AC(9)

Check Out this Related Man Page

JOURNAL_ABORT(9)					     The Linux Journalling API						  JOURNAL_ABORT(9)

NAME
journal_abort - Shutdown the journal immediately. SYNOPSIS
void journal_abort(journal_t * journal, int errno); ARGUMENTS
journal the journal to shutdown. errno an error number to record in the journal indicating the reason for the shutdown. DESCRIPTION
Perform a complete, immediate shutdown of the ENTIRE journal (not of a single transaction). This operation cannot be undone without closing and reopening the journal. The journal_abort function is intended to support higher level error recovery mechanisms such as the ext2/ext3 remount-readonly error mode. Journal abort has very specific semantics. Any existing dirty, unjournaled buffers in the main filesystem will still be written to disk by bdflush, but the journaling mechanism will be suspended immediately and no further transaction commits will be honoured. Any dirty, journaled buffers will be written back to disk without hitting the journal. Atomicity cannot be guaranteed on an aborted filesystem, but we _do_ attempt to leave as much data as possible behind for fsck to use for cleanup. Any attempt to get a new transaction handle on a journal which is in ABORT state will just result in an -EROFS error return. A journal_stop on an existing handle will return -EIO if we have entered abort state during the update. Recursive transactions are not disturbed by journal abort until the final journal_stop, which will receive the -EIO error. Finally, the journal_abort call allows the caller to supply an errno which will be recorded (if possible) in the journal superblock. This allows a client to record failure conditions in the middle of a transaction without having to complete the transaction to record the failure to disk. ext3_error, for example, now uses this functionality. Errors which originate from within the journaling layer will NOT supply an errno; a null errno implies that absolutely no further writes are done to the journal (unless there are any already in progress). AUTHORS
Roger Gammans <rgammans@computer-surgery.co.uk> Author. Stephen Tweedie <sct@redhat.com> Author. COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 JOURNAL_ABORT(9)
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