uimage: fix: add can_lseek_backward and use in uimage_open ...

Since commit ce0cc7fe we support forward seek on tftpfs. This feature
breaks the condition to check rather we open an uimage over tftp. Since
backward seeking is the problem here, we add the function
can_lseek_backward and check for it instead of the simple lseek.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

remove checks for xzalloc() returning NULL ...

xzalloc() either returns memory or panics, so checking for NULL is useless.

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

efi: make sure efi-fs is started in the right order ...

with this parch, EFI System partition will be mounted to /boot
instead of /mnt/diskXX.

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: Don't bother filesystems without link support with additional stat() calls ...

In __canonicalize_path() we only call stat() to know if the path
is a link or not. When the filesystem doesn't support links we
already know that it's not a link, so we do not need to call stat().
This helps the tftp filesystem since the parent directories of
a file to be opened won't be stat()ed anymore, something tftp
does not support.

Fixes: a602bebc fs: Implement links to directories

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

fs: avoid pathes with '//' in __canonicalize_path() ...

In __canonicalize_path pathes beginning with '//' can occur. This
is normally not a problem since normalize_path() will clean this
up, but it means we cannot call get_fsdevice_by_path() on these
pathes in this function, as needed in the next patch.

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

devfs-core: add function to find cdev by partuuid ...

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

fs: efi: return with correct error code in efifs_stat ...

Instead of erroring out when a file is not present, just return ENOENT if the
file does not exist and let the fs-layer handle the situation correctly.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

fs: Make locally used function canonicalize_dir() static ...

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

Merge branch 'for-next/misc'

Merge branch 'for-next/dts'

fs: add cdev_create_loop and cdev_remove_loop for loop mount option ...

Allow to create a loopback cdev from a file.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Fixed up with:

fs: Makefile: Add parseopt to all builds

parseopt.h was included to fs.c with commit 9248b, but parseopt.o has a
dependency to CONFIG_FS_NFS.

Moved parseopt.o to the default build to eliminate build failures.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: Makefile: Add parseopt to all builds ...

parseopt.h was included to fs.c with commit 9248b, but parseopt.o has a
dependency to CONFIG_FS_NFS.

Moved parseopt.o to the default build to eliminate build failures.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: add parseopt_b for loop mount option ...

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fixup! fs: Implement links to directories

fs: Implement links to directories ...

So far links can only point to files. Implement links to
directories. With this all kinds of links are supported:

- relative links
- absolute links
- links including ".."
- link loops (are detected, return -EMLINK)

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

fs: drop path_check_prereq() ...

path_check_prereq() has some bugs:

- It's called with S_IFLNK, but this is effectively a no-op because this
  case is not implemented in the function
- It uses lstat, but if stat or lstat should be used depends on the
  usecase: For opendir() stat() must be used, since we are not
  interested in the link, but in the target. For readlink() lstat() must
  be used since we are indeed interested in the link, not the target.

It's easier and better understandable to open code the functionality
where it's needed, so drop path_check_prereq() and do the right thing
where called.

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

fs: Create automount entries for the default mount pathes ...

In barebox the default mount path for a cdev is /mnt/<cdevname>
which can be mounted with "mount <cdevname>" without specifying
a target path explicitly. Simplify this further by creating automount
entries for the default mount pathes which makes a manual mount
completely unnecessary.

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

fs: squashfs: fix "no previous prototype for 'squashfs_set_rootarg'" warning ...

The patch fixes this compiler's warning:

  fs/squashfs/squashfs.c:115:6: warning: no previous prototype for 'squashfs_set_rootarg' [-Wmissing-prototypes]
   void squashfs_set_rootarg(struct squashfs_priv *priv, struct fs_device_d *fsdev)
        ^

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/ofpart'

fs: devfs-core: replace DEVFS_IS_PARTITION flag with pointer to the master cdev ...

Instead of having a flag indicating a cdev is a partition on
some master cdev, just add a master pointer to the cdev, so
that we can also find out who the master is.

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

fs: devfs-core: remove unused code ...

Partitions on mtd devices are implemented as mtd devices themselves
which have a ioctl hook. The DEVFS_IS_PARTITION flag is never set
for these devices, so the partition offset translation code in
fs/devfs-core.c is unused. Remove it.

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

cdev: Collect partitions on list ...

We currently do not have a way to iterate over all partitions of
a cdev. Change this.

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

ext4: Use correct descriptor size when reading the block group descriptor ...

This is an adoption of the U-Boot commit

| commit f798b1d
| Author: Stefan Brüns <stefan.bruens@rwth-aachen.de>
| Date:   Sat Sep 17 02:10:09 2016 +0200
|
|     ext4: Use correct descriptor size when reading the block group descriptor
|
|     The correct descriptor size must be used when calculating offsets, and
|     also to read the correct amount of data.
|
|     Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ext4: determine group descriptor size for 64bit feature ...

This is an adoption of the U-Boot commits

| commit fc214ef
| Author: Stefan Brüns <stefan.bruens@rwth-aachen.de>
| Date:   Sat Sep 17 02:10:07 2016 +0200
|
|     ext4: determine group descriptor size for 64bit feature
|
|     If EXT4_FEATURE_INCOMPAT_64BIT is set, the descriptor can be read from
|     the superblocks, otherwise it defaults to 32.
|
|     Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>

| commit 3cc5bbb
| Author: Stefan Brüns <stefan.bruens@rwth-aachen.de>
| Date:   Tue Dec 27 02:35:08 2016 +0100
|
|     fs/ext4: Initialize group descriptor size for revision level 0 filesystems
|
|     genext2fs creates revision level 0 filesystems, which are not readable
|     by u-boot due to the initialized group descriptor size field.
|     f798b1d
|
|     Reported-by: Kever Yang <kever.yang@rock-chips.com>
|     Reported-by: FrostyBytes@protonmail.com
|     Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
|     Tested-by: Kever Yang <kever.yang@rock-chips.com>

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ext4: Update ext2/3/4 superblock, group descriptor and inode structures ...

This is an adoption of the U-Boot commit

| commit 3ee2f97
| Author: Stefan Brüns <stefan.bruens@rwth-aachen.de>
| Date:   Sat Sep 17 02:10:06 2016 +0200
|
|     ext4: Update ext2/3/4 superblock, group descriptor and inode structures
|
|     Most importantly, the superblock provides the used group descriptor size,
|     which is required for the EXT4_FEATURE_INCOMPAT_64BIT.
|
|     Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ext4: fix wrong usage of le32_to_cpu() ...

This is an adoption of the U-Boot commit

| commit 011bc33
| Author: Michael Walle <michael@walle.cc>
| Date:   Mon Aug 29 10:46:46 2016 +0200
|
|     ext4: fix wrong usage of le32_to_cpu()
|
|     le32_to_cpu() must only convert the revision_level and not the boolean
|     result.
|
|     Signed-off-by: Michael Walle <michael@walle.cc>

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ext4: drop unused and misdefined INODE_SIZE_FILESYSTEM macro ...

Nota bene sblock.inode_size actually has __le16 type.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ext4: use kernel names for byte swaps ...

This is an adoption of the U-Boot commit

| commit 7f101be
| Author: Michael Walle <michael@walle.cc>
| Date:   Mon Aug 29 10:46:44 2016 +0200
|
|     ext4: use kernel names for byte swaps
|
|     Instead of __{be,le}{16,32}_to_cpu use {be,le}{16,32}_to_cpu.
|
|     Signed-off-by: Michael Walle <michael@walle.cc>

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ext4: change structure fields to __le/__be types ...

This is an adoption of the U-Boot commit

| commit 2a0b7a9
| Author: Michael Walle <michael@walle.cc>
| Date:   Mon Aug 29 10:46:43 2016 +0200
|
|     ext4: change structure fields to __le/__be types
|
|     Change all the types of ext2/4 fields to little endian types and all the
|     JBD fields to big endian types. Now we can use sparse (make C=1) to check
|     for statements where we need byteswaps.
|
|     Signed-off-by: Michael Walle <michael@walle.cc>

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/misc'