mount: Fix the printing of device name ...

Mount without argument always print a "none" as device name mounted
because entry->parent_device is always NULL.

The problem is the mount function in fs/fs.c. parent_device is
initialized to NULL and never updated. With this patch,
parent_device is set with the mounted device name.

Moreover, the mount function has been modified to print the device
name plus device id using the dev_name function.

Signed-off-by: Franck Jullien <franck.jullien@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: read: do not call read op when count is 0 ...

Some ops do not handle read with count = 0 correctly. They do
not have to if this is catched in the upper layer.

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

fix bug introduced with fixing path_check_prereq() ...

This fixes a bug introduced with:

commit 74c3632
Author: Antony Pavlov <antonynpavlov@gmail.com>
Date:   Tue Oct 18 13:48:44 2011 +0400

    fs: fix path_check_prereq()

    This patch makes impossible the situations than path_check_prereq() can make
    'return 0' without changing errno.

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

path_check_prereq is supposed to return 0 when a file does
not exist and S_UB_DOES_NOT_EXIST is given. stat() changes
errno, so we have to set errno back to 0 before returning.

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

fs: fix chdir() ...

chdir() allocates memory using mormalise_path(). But if path_check_prereq()
returns error than memory isn't freed.

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

fs: fix path_check_prereq() ...

This patch makes impossible the situations than path_check_prereq() can make
'return 0' without changing errno.

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

fs: switch to resource ...

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

mem_read/write: use resources ...

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

fs mount: fix error handling ...

If we register a device we have to unregister it later when
the driver did not accept the device. Also, do not forget to
free the backingstore string.

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

fs: use safe_strncpy instead of sprintf ...

This is safe against string overflows.

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

fs: implement flush function ...

Once we have caching in file functions we need a way to sync
the the underlying devices.

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

fs: errno should be set correctly before the end of functions ...

Otherwise we end up with errno not being set correctly
if a filesystem driver uses the standard open/close/read/write
functions to access its backing store.

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

fs: fix multiple mount of the same fstype ...

We need to assign a new device id if we want to register
a fs with the same type of an already registered fstype.

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

fs: Fix bug found by sparse. ...

Patch fix following sparse warning:
fs/fs.c:757:28: warning: dubious: !x & y

Signed-off-by: Marek Belisko <marek.belisko@open-nandra.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: add basic sanity check before accessing the files array ...

This patch adds some basic file descriptor sanity checks to the file access
routines. Check whether the given file descriptor is in the files array range,
and whether the file entry is valid.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: replace broken dev_protect with protect_file function ...

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

fs: write: fix writing on devices ...

We can't truncate device files. Make sure that if we want to
write beyond the device that the bytes that still fit into the
device get written.

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

get rid of device ids ...

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

Get rid of DEVICE_TYPE_FS usage ...

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

introduce cdev ...

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

fs: fix compiler warning ...

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

implement memmap for mem driver ...

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

lseek: return -1 for errors and check for that return value ...

We cannot check for < 0 in lseek, otherwise we get problems with files > 0x7fffffff

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

[fs]: set errno correctly for ioctl()

- introduce ioctl call ...

- pass open/close/lseek through to drivers

add missing null pointer check in unlink()

[general] Fixed crash in fs.h, when called with fsdrv.create == NULL ...

When a nor0 devices has no partitions assigned, then a call to
open() to create a file will jump with a NULL fct ptr.

Much more cheching code is missing and pointers to function are
jumped without any NULL ptr check. This must be fixed as well later.

Signed-off-by: Carsten Schlote <c.schlote@konzeptpark.de>

[sparse] declare functions static, use NULL as NULL pointer ...

this fixes:
fs/fs.c:210:6: warning: symbol 'files' was not declared. Should it be static?
fs/fs.c:212:6: warning: symbol 'get_file' was not declared. Should it be static?
fs/fs.c:227:6: warning: symbol 'put_file' was not declared. Should it be static?
fs/fs.c:248:5: warning: symbol 'dir_is_empty' was not declared. Should it be static?
fs/fs.c:613:41: warning: Using plain integer as NULL pointer

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

- Implement tree structure for devices ...

- 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.

use S_ISDIR macro in open()

export symbols