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doc: explain exlusive mode in backend API docs

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Add add cross references when appropriate.
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CismonX 2025-03-27 12:12:30 +08:00
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doc/bookmarkfs.texi
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@ -899,6 +899,7 @@ The error may occur when the underlying bookmark storage has been modified by
another process (e.g., a web browser) after opening a file.
If the filesystem is mounted in exclusive mode, this error should not occur.
@xref{Exclusive Mode}.
@end table
Other BookmarkFS-specific errors may occur.
@ -1300,6 +1301,9 @@ If you wish to mount the bookmarks while keeping the browser session open,
set the @samp{storage.sqlite.exclusiveLock.enabled} browser preference
to @samp{false}.
The @option{lock=exclusive} option also enables exclusive mode
(@pxref{Exclusive Mode}).
@item assume_title_distinct
If this options is provided, the backend assumes that bookmark names are
distinct under the same bookmark folder.
@ -1438,8 +1442,10 @@ or a ``fallback'' one which is less efficient but more portable.
@item none
Do not watch for changes of the bookmark storage.
With @option{watcher=none}, external changes to the bookmark storage are not
visible to the BookmarkFS filesystem.
External changes are not visible to the BookmarkFS filesystem,
and will be lost if the backend writes to the bookmark storage.
This option also enables exclusive mode (@pxref{Exclusive Mode}).
@end table
@end table
@ -1593,6 +1599,21 @@ argument, usually named @code{callback}, to be invoked by the backend.
It is guaranteed that backend functions are never called from within
a callback function.
@anchor{Exclusive Mode}
@cindex Exclusive Mode
@item Exclusive Mode
If exclusive mode is enabled for a backend context,
modifications to the corresponding bookmark storage should only be performed
by calling backend functions on the current context.
If the bookmark storage is modified by other means, filesystem and backend
behavior is undefined.
Frontend programs may perform optimizations based on this assumption.
The backend decides whether exclusive mode should be enabled for a context
during @code{backend_create} (@pxref{Create Backend Context}),
by setting the @code{BOOKMARKFS_BACKEND_EXCLUSIVE} response flag.
@item Error Codes
Some backend functions return an error code on failure instead of
just @code{-1}.
@ -1778,9 +1799,9 @@ Indicates that the @option{-o no_landlock} option is given to
@item BOOKMARKFS_BACKEND_FSCK_ONLY
Indicates that the backend is launched from @command{fsck.bookmarkfs}.
The backend must claim exclusive access to the bookmark storage, and only
the @code{bookmark_lookup}, @code{bookmark_list}, @code{bookmark_check}
and @code{bookmark_sync} functions will be called on the bookmarks.
Exclusive mode must be enabled for this context (@pxref{Exclusive Mode}), and
only the @code{bookmark_lookup}, @code{bookmark_list}, @code{bookmark_check}
and @code{bookmark_sync} functions will be called on the bookmark objects.
@end table
@item store_path
@ -1898,10 +1919,7 @@ A bit array of the following flags:
@table @code
@item BOOKMARKFS_BACKEND_EXCLUSIVE
Indicates that the backend claims exclusive access to the bookmark storage.
In exclusive mode, modifications to the bookmark storage only come from
the frontend, and the caller may perform optimizations based on
this assumption.
@xref{Exclusive Mode}.
@item BOOKMARKFS_BACKEND_HAS_KEYWORD
Indicates that the backend supports keywords for this context.
@ -2405,6 +2423,7 @@ If this error code is returned, @code{callback} must not be called.
which has access to the bookmark storage.
In exclusive mode, this is not expected to happen, and @code{bookmark_list}
is always called with a @code{cookie_ptr} of @code{NULL} value.
@xref{Exclusive Mode}.
If changes cannot be detected in an efficient way, false positives are
acceptable.