Merge branch 'for-next/ramfs'

fs: fat: extend for in-PBL support ...

The AT91 BootROM loads a boot.bin file from the first FAT partition
into SRAM, when booting from MMC. To avoid the need for two barebox
configurations for each of the bootloader stages, add PBL support
for reading from FAT. This way each stage need only have a different
PBL entry point.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: ramfs: Implement memmap ...

When an inode only has a single chunk then we can support memmap for
it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: ramfs: Use dynamically sized chunks ...

This changes the way ramfs stores its data. So far we used equally sized
chunks, this patch changes it to use chunks in a size that fits our
needs. The chunks are always allocated in the size they are needed for
the current truncation. Only if we fail to allocate all desired memory
at once we fall back to allocating smaller chunks. Together with using
the generic list implementation this results in smaller code and has
the advantage that many image files end up being contiguously in memory
and thus we can provide a memmap for them. Files will end up
contiguously in memory when they are first created, then truncated to
the final size and then filled up with data. This is something which
is normally easily achievable when desired.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: ramfs: Drop dead code ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: ramfs: Return -ENOSPC ...

When ramfs fails to allocate more memory then returning -ENOSPC is
more appropriate then -ENOMEM.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: free inodes we no longer need ...

So far we freed the no longer needed inodes only at unmount time.
Let's trust our reference counting a bit more and free them once
the reference counter hits zero.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: Make iput() accept NULL pointers ...

Let iput() accept NULL pointers so that users do not have to test for
it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: Add destroy_inode callbacks to filesystems ...

Several filesystems rely on the default function which frees
the struct inode * rather than the filesystem specific inode
which the inode is embedded in. This works because the inode
is the first element in the filesystem specific inode. Let's
not depend on this behaviour and for clarity add the destroy_inode
callbacks to all filesystems.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/misc'

fs: Fix inode size setting in ftruncate ...

When changing a file size the size of the corresponding inode has to be
changed as well.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

treewide: remove references to CREDITS ...

The CREDITS file was removed from barebox in 2015 by commit 6570288f2d97
("Remove the CREDITS file"). Remove references to it from several files.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

nfs: Do not allow to abort ...

When ctrl-c is pressed then ctrlc() will return true until
ctrlc_handled() is called. This means that once ctrl-c is pressed every
NFS operation will fail until the upper layer calls ctrlc_handled().
When for example we are doing a 'ls -l' on an NFS directory then after
a ctrl-c press not the 'ls -l' aborts, but instead the retrieving of the
directory entries which is not what we want.

Simply do not call ctrlc() in the fs layer. the NFS timeout is 2 seconds
which we have to wait until we have a chance to abort.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: nfs: don't maintain nfs dentries in dcache ...

nfs dentries may change underneath barebox, so do not maintain them in
the dcache.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

nfs: queue received packets ...

It may happen that we receive more than one RPC packet before we come
along to check the result. Instead of handling just a single received
packet and possibly overwriting the last one queue the received RPC
packets.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

nfs: Fix polling for packets ...

It can happen that the first packet we receive is not the desired one.
In this case we have to poll for further packets. set nfs_state back to
STATE_START before polling for more packets, otherwise we check the same
packet again and again.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

nfs: Fix rpc_check_reply() return value for stale packets ...

When we receive a packet with the previous rpc_id then we have
the comment "stale packet, wait a bit longer", but that's not what
the code does. rpc_check_reply() returns 0 in this case and the caller
then interprets the packet as valid.
Always return -EAGAIN for invalid rpc_ids. This lets the caller ignore
the packets as intented.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

nfs: remove unnecessary check ...

In rpc_check_reply() pkt is never NULL, drop the unnecessary patch.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

nfs: Add missing free ...

Add forgotten packet free in error path.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

nfs: Add function to free packets ...

Add to function to free packets rather than freeing them directly. We
will introduce received packet qeueuing with one of the next patches,
this patch is meant to make it better readable.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/block'

cdev: Add discard_range hook ...

To pass though discard_range() to the underlying drivers add a
discard_range hook to struct cdev_operations.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: Introduce discard_range() ...

discard_range() is a way to tell the lower layers that we are no longer
interested in a data range of a file, so that the lower layers can
discard the underlying data if desired.

This is mainly designed to bypass the deficiencies of our block layer.
We cache the block data in chunks of multiple KiB (16 currently) if
we fall into the block layer with write requests smaller than that
we have to read/modify/write a chunk. With the help of discard_range()
code writing files to a raw block device can now discard the range the
file will be written to. The block layer then no longer has to read
the chunks first that are inside the discard range.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: jffs2: add initial support for reading jffs2 ...

Import the jffs2 filesystem code from Linux v5.5-rc1 and convert it
to work with barebox.

Writing is *not* supported.

Testing was done with a n25q256a-compatible QuadSPI chip on a
SoCFPGA-based Socrates board.

Testing was done with a combination of:
	user@somelinuxhost: mkfs.jffs2 --eraseblock=4 -d fs/jffs2/ -o jffs2.img
	root@target:~ flash_erase -j /dev/mtd5 0 0
	root@target:~ dd if=jffs2.img of=/dev/mtd5
	barebox@EBV SOCrates:/ mount /dev/mtd0.data
	(...)
	mounted /dev/mtd0.data on /mnt/mtd0.data

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

pstore: ramoops: use correct format specifier for size_t variables ...

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

pstore: don't try to grab non-existent logbuf ...

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

pstore: remove unused goto label ...

Previous refactoring removed jumps to fail_clear. Remove it.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

pstore: fix build by re-resolving botched merge conflict ...

297ac7288 ("pstore: Only capture log messages") removed the pstore console.
v3 of the eventually merged 75a74b5c ("console: fix out-of-bounds read
in dputc(/dev/*, ...)") reinstated part of this code, which broke the
pstore build because the now removed bufsize member had a user
reintroduced in the patch.

Fix this by reverting the offending patch's changes to the pstore code.
It wasn't applicable to begin with.

Fixes: 75a74b5c ("console: fix out-of-bounds read in dputc(/dev/*, ...)")
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/misc'

Merge branch 'for-next/ext4'