When restoring the COW flag for journals on BTRFS, the full journal contents
are copied into new files. But during these operations, the acls of the
previous files were lost and users were not able to access to their old
journal contents anymore.
The approach to use '''…'''.split() instead of a list of strings was initially
used when converting from automake because it allowed identical blocks of lines
to be used for both, making the conversion easier.
But over the years we have been using normal lists more and more, especially
when there were just a few filenames listed. This converts the rest.
No functional change.
Add dlopen_dw(), dlopen_elf() and dlopen_pcre2() to the dlopen test.
To enable adding dlopen_pcre2(), we move pcre2-dlopen.h/c from
src/journal to src/shared.
Apparently the error code fallocate() returns if hole punching is not
supported is not too well defined (man page just says "an error is
returned"), hence let's accept the usual set of errors, and the
normalize it to EOPNOTSUPP, and generate a clear error message in this
case.
We have the journal file open already, hence reference it via the fd
insted of the file name. After all, some other tool might have
renamed/deleted it already.
Let's not actually reuse the fd though, since we want a separate file
offset for the copying, hence just make it simply and reopen via
/proc/self/fd/.
Follow-up for d71ece3f0b
This partially undoes the effect of
ab6e257b3e.
Originally, we always used the mmap logic to determine the current end
of the file. ab6e257b3e changed this so
that we always used pread().
With this change we'll use pread() from the synchronization thread and
mmap otherwise.
This fixes a bunch of issues:
pread() returns ssize_t, and returns errors in 'errno', handle that
correctly.
More importantly: it might incompletely read data in case we hit
EOF. Check for that, and handle it.
Finally, rename the function to journal_file_read_object_header(), since
it really doesn't read full objects, but only their headers.
Follow-up for: 117e21121e
This reduces the number of calls to journal_file_move_to_object() which are heavy.
All call sites have easy access to the data object so this change doesn't end up
complicating things.
ELEMENTSOF(iovec) is not the correct value for the newly introduced parameter m
to function map_all_fields because it is the maximum number of elements in the
iovec array, including those reserved for N_IOVEC_META_FIELDS. The correct
value is the current number of already used elements in the array plus the
maximum number to use for fields decoded from the kernel audit message.
Previously, the holes we punched earlier would get removed when
copying the file. Let's enable the new COPY_HOLES flag to make
sure this doesn't happen.
In my test, this drops a 800MB btrfs journal (without compression)
to 720 MB.
Fixes#22087
Allowing -e to be used to view the last logs of a previous boot seems
like a useful feature so let's not discard -b options anymore when
followed by -e.
Fixes#22107
The meson default for static_library() are:
build_by_default=true, install=false. We never interact with the
static libraries, and we only care about them as a stepping-stone towards
the installable executables or libraries. Thus let's only build them if
they are a dependency of something else we are building.
While at it, let's drop install:false, since this appears to be the default.
This change would have fixed the issue with lib_import_common failing
to build too: we wouldn't attempt to build it.
In practice this changes very little, because we generally only declare static
libraries where there's something in the default target that will make use of
them. But it seems to be a better pattern to set build_by_default to false.
Let's not try to be overly clever here. This code path is not overly
performance sensitive and we should avoid trying to outsmart the kernel
without proper benchmarking.
pread() is not guaranteed to completely fill up the given buffer with
data which we assumed until now. Instead, only increment the offset by
the number of bytes that were actually read.
The variable is not useful outside of the loop (it'll always be null
after the loop is finished), so we can declare it inline in the loop.
This saves one variable declaration and reduces the chances that somebody
tries to use the variable outside of the loop.
For consistency, 'de' is used everywhere for the var name.
The message that the "journal begins … ends …" has been always confusing to
users. (Before b91ae210e6 it was "logs begin … end …" which was arguably even
more confusing, but really the change in b91ae210e6 didn't substantially change
this.)
When the range shown is limited (by -e, -f, --since, or other options), it
doesn't really matter to the user what the oldest entries are, since they are
purposefully limiting the range. In fact, if we are showing the last few
entries with -e or -f, knowing that many months the oldest entries have is
completely useless.
And when such options are *not* used, the first entry generally corresponds to
the beginning of the range shown, and the last entry corresponds to the end of
that range. So again, it's not particularly useful, except when debugging
journalctl or such. Let's just treat it as a debug message.
Fixes#21491.
Previously the MMapCache* was optionally NULL, which open would
handle by creating a new MMapCache* for the occasion.
This produced some slightly circuitous refcount-handling code in
the function, as well as arguably creating opportunities for
weirdness where an MMapCache* was intended to be supplied but
happened to be NULL, which this magic would then paper over.
In any case, this was basically only being utilized by tests,
apparently just to avoid having to create an MMapCache. So
update the relevant tests to supply an MMapCache and make
journal_file_open() treat a NULL MMapCache* as fatal w/assert.
Franck Bui
Yu Watanabe
Lennart Poettering
Jan Janssen
Frantisek Sumsal
Zbigniew Jędrzejewski-Szmek
Daan De Meyer
YmrDtnJu
Luca Boccassi
наб
Vito Caputo