diff options
Diffstat (limited to 'nuttx/fs/nxffs/nxffs_unlink.c')
-rw-r--r-- | nuttx/fs/nxffs/nxffs_unlink.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/nuttx/fs/nxffs/nxffs_unlink.c b/nuttx/fs/nxffs/nxffs_unlink.c new file mode 100644 index 000000000..9d0d5b49e --- /dev/null +++ b/nuttx/fs/nxffs/nxffs_unlink.c @@ -0,0 +1,187 @@ +/**************************************************************************** + * fs/nxffs/nxffs_unlink.c + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * References: Linux/Documentation/filesystems/romfs.txt + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <string.h> +#include <errno.h> +#include <assert.h> +#include <debug.h> + +#include <nuttx/fs/fs.h> +#include <nuttx/mtd.h> + +#include "nxffs.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Public Types + ****************************************************************************/ + +/**************************************************************************** + * Public Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: nxffs_rminode + * + * Description: + * Remove an inode from FLASH. This is the internal implementation of + * the file system unlinke operation. + * + * Input Parameters: + * volume - Describes the NXFFS volume. + * name - the name of the inode to be deleted. + * + * Returned Value: + * Zero is returned if the inode is successfully deleted. Otherwise, a + * negated errno value is returned indicating the nature of the failure. + * + ****************************************************************************/ + +int nxffs_rminode(FAR struct nxffs_volume_s *volume, FAR const char *name) +{ + FAR struct nxffs_ofile_s *ofile; + FAR struct nxffs_inode_s *inode; + struct nxffs_entry_s entry; + int ret; + + /* Check if the file is open */ + + ofile = nxffs_findofile(volume, name); + if (ofile) + { + /* We can't remove the inode if it is open */ + + fdbg("Inode '%s' is open\n", name); + ret = -EBUSY; + goto errout; + } + + /* Find the NXFFS inode */ + + ret = nxffs_findinode(volume, name, &entry); + if (ret < 0) + { + fdbg("Inode '%s' not found\n", name); + goto errout; + } + + /* Set the position to the FLASH offset of the file header (nxffs_findinode + * should have left the block in the cache). + */ + + nxffs_ioseek(volume, entry.hoffset); + + /* Make sure the the block is in the cache */ + + ret = nxffs_rdcache(volume, volume->ioblock); + if (ret < 0) + { + fdbg("Failed to read data into cache: %d\n", ret); + goto errout_with_entry; + } + + /* Change the file status... it is no longer valid */ + + inode = (FAR struct nxffs_inode_s *)&volume->cache[volume->iooffset]; + inode->state = INODE_STATE_DELETED; + + /* Then write the cached block back to FLASH */ + + ret = nxffs_wrcache(volume); + if (ret < 0) + { + fdbg("Failed to read data into cache: %d\n", ret); + } + +errout_with_entry: + nxffs_freeentry(&entry); +errout: + return ret; +} + +/**************************************************************************** + * Name: nxffs_unlink + * + * Description: Remove a file + * + ****************************************************************************/ + +int nxffs_unlink(FAR struct inode *mountpt, FAR const char *relpath) +{ + FAR struct nxffs_volume_s *volume; + int ret; + + fvdbg("Entry\n"); + + /* Sanity checks */ + + DEBUGASSERT(mountpt && mountpt->i_private); + + /* Get the mountpoint private data from the NuttX inode structure */ + + volume = mountpt->i_private; + ret = sem_wait(&volume->exclsem); + if (ret != OK) + { + goto errout; + } + + /* Then remove the NXFFS inode */ + + ret = nxffs_rminode(volume, relpath); + + sem_post(&volume->exclsem); +errout: + return ret; +} |