When registering a filesystem device add a device parameter suitable
for the Linux root= option to boot from exactly this filesystem. Currently
the fs layer sets this parameter to the root=PARTUUID= mechanism if a
partuuid is available. Other filesystems like NFS and UBIFS which do
not have a PARTUUID can overwrite this.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
The struct device_d * in struct filep is never of interest, instead
it is always converted to a struct fs_device_d *, so simplify the code
by storing the struct fs_device_d * directly.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
We have our file helper functions in several places. Move them
all to lib/libfile.c.
With this we no longer have file helpers in fs/fs.c which contains
the core fs functions and no functions in lib/libbb.c which are
not from busybox.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Similar to mount(8) the barebox command mount now supports passing a string
to the file system driver via -o.
This is used in the next commit to let the user specify port numbers for
nfs mounts.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
It's useful to know which filesystems a barebox binary supports.
Add a -v option to the mount command to find it out.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
All filesystem drivers which need a backingstore device do the same
ignoring of '/dev/' in the backingstore followed by a cdev_open. Add a
helper function for it and let the core handle the cdev. As a side
effect this makes sure that fsdev->cdev is also set when a device is
mounted without the leading '/dev/' which was previously ignored
by the mount code.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Some tftp servers (for example netkit-tftp) do not pass the filesize.
Add a workaround for read_file which reads the file into a temporary
file which then is copied to a buffer.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Add pread and pwrite functions.
Split read and write functions to save some space.
The functions pread and pwrite saves and sets the file
position to a given offset and restore them afterwards.
This also makes the nandtest command use these function
which is necessary to not break compilation for the nandtest
command.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
For compatibility put a inline on lstat for stat until we have the symlink
support.
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
The standard devices are currently broken since they have
the size ~0. As now files use loff_t as file size which is a signed
type the read implementation gets confused and now returns -1.
The current implementation also has the (somewhat theorical) problem
that we do not have real streaming devices, so /dev/zero went out
of zeroes after reading 4GB (or now LLONG_MAX).
This patch introduces a new cdev flag DEVFS_IS_CHARACTER_DEV and a new
file size flag FILE_SIZE_STREAM which makes it possible to create
real stream devices instead.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This patch adds an automount command which makes it possible
to execute a script when a certain directory is first accessed.
It's the commands responsibility to make this directory available
(bringing devices up and mounting it). This results in automount
support which makes sure that from the shell every file can
be accessed without having to care for device bringup. Bringing
up devices may be expensive (USB, dhcp). The automount support
makes it easy for the environment to bringup devices when they
are actually needed.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
every struct fs_device_d contains a struct mtab_entry, so they
have a 1:1 relationship. Instead of having to use container_of
to get from a struct mtab_entry to a struct fs_device_d we can
better embed the members of struct mtab_entry into struct fs_device_d
directly.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
By putting the fs devices/drivers on a bus on its own we can hook
into the bus remove function to cleanup the fs device. This way
we can unmount a device by simply unregistering the device which
is useful for for example USB mass storage devices. These can now
unregister the assoiated filesystems by unregistering their child
devices.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
We store the fs devices in a list only because we want to
check if the fs driver needs a backingstore or not. The
driver will bail out anyway if it needs a backingstore and
doesn't find one. So we can remove this check and thus remove
the list of fs devices.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
To make the code a bit easier to read. Also, do not allow
to umount / when something else is mounted.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
- Use device tree structure to implement partitions
- Let devinfo print a nice tree
- Introduce 'fixed' partitions which are not removable
- Fix mount: It was not possible to mount on a relative path.
int open(const char *pathname, int flags);
-> int open(const char *pathname, int flags, ...);
int mkdir(const char *pathname);
-> int mkdir(const char *pathname, mode_t mode);
