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Let's split the function in three: the part where we archive the old
file into journal_file_archive(), and the part where we initiate the
deferred closing into journal_file_initiate_close().
journal_file_rotate() then simply becomes a wrapper around these two
calls, and the opening of the new journal file.
This useful so that we can archive journal files without having to open
new ones, i.e. to do only the archival part of the rotation, without the
rotation part.
Let's store array sizes and indexes in size_t. And let's count numbers
of files in uint64_t (simply because that is the type of the input
parameter for this of the function)
journald calls fd_get_path() a lot (it probably shouldn't, there's some
room for improvement there, but I'll leave that for another time), hence
it's worth optimizing the call a bit, in particular as it's easy.
Previously we'd open the dir /proc/self/fd/ first, before reading the
symlink inside it. This means the whole function requires three system
calls: open(), readlinkat(), close(). The reason for doing it this way
is to distinguish the case when we see ENOENT because /proc is not
mounted and the case when the fd doesn't exist.
With this change we'll directly go for the readlink(), and only if that
fails do an access() to see if /proc is mounted at all.
This optimizes the common case (where the fd is valid and /proc
mounted), in favour of the uncommon case (where the fd doesn#t exist or
/proc is not mounted).
I noticed while profiling journald that we invoke readlinkat() a ton on
open /proc/self/fd/<fd>, and that the returned paths are more often than
not longer than the 99 chars used before, when we look at archived
journal files. This means for these cases we generally need to execute
two rather than one syscalls.
Let's increase the buffer size a tiny bit, so that we reduce the number
of syscalls executed. This is really a low-hanging fruit of
optimization.
Our current set of flags allows an option to be either
use just in initrd or both in initrd and normal system.
This new flag is intended to be used in the case where
you want apply some settings just in initrd or just
in normal system.
Don't add an implicit RequiresMountsFor depenency for the
WorkingDirectory of a unit if the "-" character was used to
indicate that "a missing working directory is not considered fatal"
(see systemd.exec(5)). Otherwise systemd might fail the unit
because of missing dependencies.
This doesn't change anything in the generated source, but I think makes
semantically more sense, as these structures have undefined size, and we
only want to know the size up to the data field in these cases.
The &MEMORY_ACCOUNTING_DEFAULT; resolves to "yes" or "no" while the rest
of the paragraph talked about "on" and "off". Let's adjust this and
stick to "yes" and "no"...
Quite frankly I think it's not a particularly good idea to change the
docs based configuration changes... THis can only be incomplete, and the
wording is still very awkward since we repeat the same sentence twice.
THis dep existed since the unit was introduced, but I cannot see what
good it would do. Hence in the interest of simplifying things, let's
drop it. If breakages appear later we can certainly revert this again.
Fixes: #10469
First of all, let's fix logging: let's simply log the same message as we
do on success, so that there's always the same pair of these messages
around, regardless if the suspend was successful or not. To distuingish
a successful suspend from a failed one, check the ERRNO= field of the
structured message.
In most ways a failed suspend cycle is not distuingishable from a
successful one that took no time, hence let's treat it this way, and
always pair the success message with a failure message.
This also changes a more important concept: the post-suspend callouts
are now called also called on failure, following the same logic: let's
always run them in pairs: for every pre callout a post callout has to
follow.
Let's be a tiny bit more careful here.
Also, let's rearrange things to simplify them a bit, and to not use "r"
outside of its immediate scope of validity.
Also, let's rename it to rtc_write_wake_alarm(). Both changes together
make sure rtc_write_wake_alarm() and rtc_read_time() are more alike in
their naming and semantics.
