fix memory leak in dfs_elm.c and umount fatfs when mount fatfs fails (this bug leads to mkfs failure in linux)

elm fatfs support mkfs with no need to  run dfs_mount elm first; and can mount/umount/mkfs without reset any more

remove the drivers in uffs/nand which is already out of date. now you can look simulator to explore how to use uffs on nand flash or Realtouch demo code on github

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2576 bbd45198-f89e-11dd-88c7-29a3b14d5316

1. fix bug in uffs_nandif.c to work with mtd nand driver; 2)clean code in uffs_nandif.c and dfs_uffs.h

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2575 bbd45198-f89e-11dd-88c7-29a3b14d5316

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2558 bbd45198-f89e-11dd-88c7-29a3b14d5316

now we can create file or directory  on NFS server both with FreeNFS on windows and nfs-server on linux

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2556 bbd45198-f89e-11dd-88c7-29a3b14d5316

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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2492 bbd45198-f89e-11dd-88c7-29a3b14d5316

add DFS_NFS_MAX_MTU to nfs to support read/write more than one mtu data in nfs; 2) fix a bug in nfs_lseek when offset is at the end of file.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2485 bbd45198-f89e-11dd-88c7-29a3b14d5316

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2478 bbd45198-f89e-11dd-88c7-29a3b14d5316

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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2412 bbd45198-f89e-11dd-88c7-29a3b14d5316

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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2322 bbd45198-f89e-11dd-88c7-29a3b14d5316

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2292 bbd45198-f89e-11dd-88c7-29a3b14d5316

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2285 bbd45198-f89e-11dd-88c7-29a3b14d5316

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2256 bbd45198-f89e-11dd-88c7-29a3b14d5316

partition on physical media.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2251 bbd45198-f89e-11dd-88c7-29a3b14d5316

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2250 bbd45198-f89e-11dd-88c7-29a3b14d5316

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2249 bbd45198-f89e-11dd-88c7-29a3b14d5316

add chk_mounted in dfs_elm_mount to make sure that there is a valid fat partition on physical media.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2248 bbd45198-f89e-11dd-88c7-29a3b14d5316