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errseq: Add to documentation tree

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- Move errseq.rst into core-api
 - Add errseq to the core-api index
 - Promote the header to a more prominent header type, otherwise we get three
   entries in the table of contents.
 - Reformat the table to look nicer and be a little more proportional in
   terms of horizontal width per bit (the SF bit is still disproportionately
   large, but there's no way to fix that).
 - Include errseq kernel-doc in the errseq.rst
 - Neaten some kernel-doc markup

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Matthew Wilcox 2017-12-22 06:32:16 -08:00 • committed by Jonathan Corbet
parent aa931b44ae
commit 14ebc28e07
4 changed files with 38 additions and 22 deletions
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37
lib/errseq.c
View file

@ -46,14 +46,14 @@
* @eseq: errseq_t field that should be set
* @err: error to set (must be between -1 and -MAX_ERRNO)
*
* This function sets the error in *eseq, and increments the sequence counter
* This function sets the error in @eseq, and increments the sequence counter
* if the last sequence was sampled at some point in the past.
*
* Any error set will always overwrite an existing error.
*
* We do return the latest value here, primarily for debugging purposes. The
* return value should not be used as a previously sampled value in later calls
* as it will not have the SEEN flag set.
* Return: The previous value, primarily for debugging purposes. The
* return value should not be used as a previously sampled value in later
* calls as it will not have the SEEN flag set.
*/
errseq_t errseq_set(errseq_t *eseq, int err)
{
@ -108,11 +108,13 @@ errseq_t errseq_set(errseq_t *eseq, int err)
EXPORT_SYMBOL(errseq_set);
/**
* errseq_sample - grab current errseq_t value
* @eseq: pointer to errseq_t to be sampled
* errseq_sample() - Grab current errseq_t value.
* @eseq: Pointer to errseq_t to be sampled.
*
* This function allows callers to sample an errseq_t value, marking it as
* "seen" if required.
*
* Return: The current errseq value.
*/
errseq_t errseq_sample(errseq_t *eseq)
{
@ -134,15 +136,15 @@ errseq_t errseq_sample(errseq_t *eseq)
EXPORT_SYMBOL(errseq_sample);
/**
* errseq_check - has an error occurred since a particular sample point?
* @eseq: pointer to errseq_t value to be checked
* @since: previously-sampled errseq_t from which to check
* errseq_check() - Has an error occurred since a particular sample point?
* @eseq: Pointer to errseq_t value to be checked.
* @since: Previously-sampled errseq_t from which to check.
*
* Grab the value that eseq points to, and see if it has changed "since"
* the given value was sampled. The "since" value is not advanced, so there
* Grab the value that eseq points to, and see if it has changed @since
* the given value was sampled. The @since value is not advanced, so there
* is no need to mark the value as seen.
*
* Returns the latest error set in the errseq_t or 0 if it hasn't changed.
* Return: The latest error set in the errseq_t or 0 if it hasn't changed.
*/
int errseq_check(errseq_t *eseq, errseq_t since)
{
@ -155,11 +157,11 @@ int errseq_check(errseq_t *eseq, errseq_t since)
EXPORT_SYMBOL(errseq_check);
/**
* errseq_check_and_advance - check an errseq_t and advance to current value
* @eseq: pointer to value being checked and reported
* @since: pointer to previously-sampled errseq_t to check against and advance
* errseq_check_and_advance() - Check an errseq_t and advance to current value.
* @eseq: Pointer to value being checked and reported.
* @since: Pointer to previously-sampled errseq_t to check against and advance.
*
* Grab the eseq value, and see whether it matches the value that "since"
* Grab the eseq value, and see whether it matches the value that @since
* points to. If it does, then just return 0.
*
* If it doesn't, then the value has changed. Set the "seen" flag, and try to
@ -170,6 +172,9 @@ EXPORT_SYMBOL(errseq_check);
* value. The caller must provide that if necessary. Because of this, callers
* may want to do a lockless errseq_check before taking the lock and calling
* this.
*
* Return: Negative errno if one has been stored, or 0 if no new error has
* occurred.
*/
int errseq_check_and_advance(errseq_t *eseq, errseq_t *since)
{