fs/fat: fix FAT32 detection ...

Limits for the number of clusters were used to determine the FAT fs type.
This fails e.g. for FAT32 fs with low cluster number that can be found
in certain Android images.
Sync the FAT fs type detection to the method used in linux by checking
the sectors/FAT entries at offset 0x16 (must be zero for FAT32) and offset
0x24 (must be non-zero for FAT32).

Signed-off-by: Alexander Kurz <akurz@blala.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/net'

Merge branch 'for-next/missing-prototypes'

fs: tftp: Make filesize a 64bit type ...

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

net: dns: return error codes ...

The resolv() function used to return the IP address. When net_udp_new()
fails we return an error code though which the callers of resolv() take
as an IP address. This is wrong of course and we could return 0 in this
case. Instead we return an error code and pass the resolved IP as a
pointer which allows us to return proper error codes.

This patch also adds error messages and error returns to the various
callers of resolv() which used to just continue with a zero IP and
let the user figure out what went wrong.

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

fs: fix possible null pointer dereference of base. ...

we use base before checking if it is NULL

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: closedir: remove uninitialized variable ret ...

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: devfs: Make locally used function static ...

devfs_iterate() is only used locally, so make it static.

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

fs: ubifs: Avoid missing prototype warning ...

Remove unused ubifs_iput() and make locally used functions static.

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

Merge branch 'for-next/net-switch-mv88e6xxx'

Merge branch 'for-next/missing-prototypes'

fs: devfs: implement d_revalidate hook ...

The files in devfs can change withouut the fs layer noticing, so we
have to revalidate dentries before using them.

A failure could be triggered with:

ls /dev/nand0.root.ubi; ubiattach /dev/nand0.root; ls /dev/nand0.root.ubi

The first 'ls' would create a dentry for nand0.root.ubi with no inode
associated since it does not yet exist. 'ubiattach' then creates that
file, but the second 'ls' does not show it since the dentry is not
revalidated and thus no inode is added to that dentry. This patch
fixes this and also the opposite case when a file is removed (for
example with ubidetach).

Reported-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: implement d_revalidate ...

d_revalidate is useful when filesystems change under the hood of the
fs layer. This can happen with network filesystems or with devfs.

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

fs: Make locally used functions static ...

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

drivers: Introduce dev_set_name() ...

Introduce dev_set_name() in order to hide implementation details of
setting device's name so it'd be easier to change it.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/ubifs'

Merge branch 'for-next/fs'

fs: improve ramfs_truncate speed ...

During sequential writes into single file, fs layer is consequently
calling ramfs_truncate() function. When file size grows
ramfs_truncate() takes more and more time to complete, due to
interations through all already written data chunks. As an example
loading ~450M image using usb fastboot protocol took over 500s to
complete.

Use ramfs_find_chunk() function to search for last chunk of data in
ramfs_truncate() implementation, which saves a lot of loop
iterations. As a result loading ~450M image using usb fastboot
protocol takes around 25s now.

Tested-by: Maciej Zagrabski <m.zagrabski@grinn-global.com>
Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: ubifs: optionally allow to mount UBIFS images with encrypted files ...

Currently we do not support the UBIFS file encryption feature.
Nevertheless we can allow read clear files from UBIFS to be
able to boot an unencrypted kernel. This differs from the Kernel
behaviour, so add a globalvar to make that configurable.

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

ubifs: Update to v4.18-rc6 ...

This syncs the UBIFS code with Linux-4.19-rc6.

There are many functions in the Linux UBIFS codebase that we do not need
for a readonly implementation. These are missing here, but all removed
functions are annotated as such so it should be relatively easy to copy
a newer codebase over the current one and to see which functions shall
be removed from the newer version.

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

fs: ubifs: remove not needed code ...

This patch aggressively removes stuff that we do not need in a readonly
implementation:

- write buffering support
- lpt/ltab code
- garbage collector
- everything under #ifndef __BAREBOX__

This decreases the binary size by about 5k on ARM, but the main reason
for doing this is the idea that things that are not there don't need to
be synced with upstream ubifs code.
The __BAREBOX__ ifdeffery makes the code very hard to read and is a
maintenance burden by itself, so it is removed here aswell.

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

fs: implement clear_nlink and set_nlink ...

Implement clear_nlink and set_nlink and remove the private versions
from UBIFS.

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

fs: implement iget_locked and iget_failed ...

Implement in fs core rather than using a private version in UBIFS.

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

fs: implement file_inode ...

To ease code porting from Linux

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

Add more mutex no-ops ...

Add mutex_lock_nested, mutex_unlock_nested and mutex_is_locked to
include/linux/mutex.h and remove them from UBIFS.

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

Add kmemdup ...

We have kmemdup as a UBIFS specific variant, put it into the correct
header files. Instead of reimplementing it just use memdup we already
have.

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

Add linux/slab.h ...

Move stuff we already have in include/linux/barebox-wrapper.h that
really belongs to include/linux/slab.h to there. Also add kmem_cache_*
functions. UBIFS uses them in there own implementation, so we have to
remove it there.

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

fs: ubifs: Do not free memory not allocated by ubifs ...

Since the switch to dentry cache implementation we no longer allocate
the super block, so we must not free it in the error path.

Fixes: ("4d2b23bcf9 fs: ubifs: Switch to dentry cache implementation")

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

fs: ramfs: make chunk counting in truncate() better readable ...

In ramfs_truncate() "newchunks" denotes the number of chunks we
want to have after the call. We decrease that number while iterating
over the existing chunks and decrease it further with every newly
allocated chunk until "newchunks" is zero.
This is a bit hard to read. Instead we drop the decreasing while
iterating over existing chunks and increase "oldchunks" while allocating
until it reaches "newchunks".

This is mainly done to make the next patch easier.

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

fs: stat: Do not forget to set errno ...

stat() needs to set errno correctly when returning with an error.

Fixes: b3fbfad7ae ("fs: dentry cache implementation")

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