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Diffstat (limited to 'nuttx/fs/romfs/fs_romfs.c')
-rw-r--r--nuttx/fs/romfs/fs_romfs.c1090
1 files changed, 1090 insertions, 0 deletions
diff --git a/nuttx/fs/romfs/fs_romfs.c b/nuttx/fs/romfs/fs_romfs.c
new file mode 100644
index 000000000..8a2e69665
--- /dev/null
+++ b/nuttx/fs/romfs/fs_romfs.c
@@ -0,0 +1,1090 @@
+/****************************************************************************
+ * rm/romfs/fs_romfs.h
+ *
+ * Copyright (C) 2008-2009, 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 <sys/types.h>
+#include <sys/statfs.h>
+#include <sys/stat.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <assert.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/fs/fs.h>
+#include <nuttx/fs/ioctl.h>
+#include <nuttx/fs/dirent.h>
+
+#include "fs_romfs.h"
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static int romfs_open(FAR struct file *filep, const char *relpath,
+ int oflags, mode_t mode);
+static int romfs_close(FAR struct file *filep);
+static ssize_t romfs_read(FAR struct file *filep, char *buffer, size_t buflen);
+static off_t romfs_seek(FAR struct file *filep, off_t offset, int whence);
+static int romfs_ioctl(FAR struct file *filep, int cmd, unsigned long arg);
+
+static int romfs_opendir(struct inode *mountpt, const char *relpath,
+ struct fs_dirent_s *dir);
+static int romfs_readdir(struct inode *mountpt, struct fs_dirent_s *dir);
+static int romfs_rewinddir(struct inode *mountpt, struct fs_dirent_s *dir);
+
+static int romfs_bind(FAR struct inode *blkdriver, const void *data,
+ void **handle);
+static int romfs_unbind(void *handle, FAR struct inode **blkdriver);
+static int romfs_statfs(struct inode *mountpt, struct statfs *buf);
+
+static int romfs_stat(struct inode *mountpt, const char *relpath, struct stat *buf);
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/* See fs_mount.c -- this structure is explicitly externed there.
+ * We use the old-fashioned kind of initializers so that this will compile
+ * with any compiler.
+ */
+
+const struct mountpt_operations romfs_operations =
+{
+ romfs_open, /* open */
+ romfs_close, /* close */
+ romfs_read, /* read */
+ NULL, /* write */
+ romfs_seek, /* seek */
+ romfs_ioctl, /* ioctl */
+ NULL, /* sync */
+
+ romfs_opendir, /* opendir */
+ NULL, /* closedir */
+ romfs_readdir, /* readdir */
+ romfs_rewinddir, /* rewinddir */
+
+ romfs_bind, /* bind */
+ romfs_unbind, /* unbind */
+ romfs_statfs, /* statfs */
+
+ NULL, /* unlink */
+ NULL, /* mkdir */
+ NULL, /* rmdir */
+ NULL, /* rename */
+ romfs_stat /* stat */
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: romfs_open
+ ****************************************************************************/
+
+static int romfs_open(FAR struct file *filep, const char *relpath,
+ int oflags, mode_t mode)
+{
+ struct romfs_dirinfo_s dirinfo;
+ struct romfs_mountpt_s *rm;
+ struct romfs_file_s *rf;
+ int ret;
+
+ fvdbg("Open '%s'\n", relpath);
+
+ /* Sanity checks */
+
+ DEBUGASSERT(filep->f_priv == NULL && filep->f_inode != NULL);
+
+ /* mountpoint private data from the inode reference from the file
+ * structure
+ */
+
+ rm = (struct romfs_mountpt_s*)filep->f_inode->i_private;
+
+ DEBUGASSERT(rm != NULL);
+
+ /* Check if the mount is still healthy */
+
+ romfs_semtake(rm);
+ ret = romfs_checkmount(rm);
+ if (ret != OK)
+ {
+ fdbg("romfs_checkmount failed: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ /* ROMFS is read-only. Any attempt to open with any kind of write
+ * access is not permitted.
+ */
+
+ if ((oflags & O_WRONLY) != 0 || (oflags & O_RDONLY) == 0)
+ {
+ fdbg("Only O_RDONLY supported\n");
+ ret = -EACCES;
+ goto errout_with_semaphore;
+ }
+
+ /* Initialize the directory info structure */
+
+ memset(&dirinfo, 0, sizeof(struct romfs_dirinfo_s));
+
+ /* Locate the directory entry for this path */
+
+ ret = romfs_finddirentry(rm, &dirinfo, relpath);
+ if (ret < 0)
+ {
+ fdbg("Failed to find directory directory entry for '%s': %d\n",
+ relpath, ret);
+ goto errout_with_semaphore;
+ }
+
+ /* The full path exists -- but is the final component a file
+ * or a directory?
+ */
+
+ if (IS_DIRECTORY(dirinfo.rd_next))
+ {
+ /* It is a directory */
+
+ ret = -EISDIR;
+ fdbg("'%s' is a directory\n", relpath);
+ goto errout_with_semaphore;
+ }
+
+#ifdef CONFIG_FILE_MODE
+# warning "Missing check for privileges based on inode->i_mode"
+#endif
+
+ /* Create an instance of the file private data to describe the opened
+ * file.
+ */
+
+ rf = (struct romfs_file_s *)zalloc(sizeof(struct romfs_file_s));
+ if (!rf)
+ {
+ fdbg("Failed to allocate private data\n", ret);
+ ret = -ENOMEM;
+ goto errout_with_semaphore;
+ }
+
+ /* Initialize the file private data (only need to initialize
+ * non-zero elements)
+ */
+
+ rf->rf_open = true;
+ rf->rf_size = dirinfo.rd_size;
+
+ /* Get the start of the file data */
+
+ ret = romfs_datastart(rm, dirinfo.rd_dir.fr_curroffset,
+ &rf->rf_startoffset);
+ if (ret < 0)
+ {
+ fdbg("Failed to locate start of file data: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ /* Configure buffering to support access to this file */
+
+ ret = romfs_fileconfigure(rm, rf);
+ if (ret < 0)
+ {
+ fdbg("Failed configure buffering: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ /* Attach the private date to the struct file instance */
+
+ filep->f_priv = rf;
+
+ /* Then insert the new instance into the mountpoint structure.
+ * It needs to be there (1) to handle error conditions that effect
+ * all files, and (2) to inform the umount logic that we are busy
+ * (but a simple reference count could have done that).
+ */
+
+ rf->rf_next = rm->rm_head;
+ rm->rm_head = rf->rf_next;
+
+ romfs_semgive(rm);
+ return OK;
+
+ /* Error exits */
+
+errout_with_semaphore:
+ romfs_semgive(rm);
+ return ret;
+}
+
+/****************************************************************************
+ * Name: romfs_close
+ ****************************************************************************/
+
+static int romfs_close(FAR struct file *filep)
+{
+ struct romfs_mountpt_s *rm;
+ struct romfs_file_s *rf;
+ int ret = OK;
+
+ fvdbg("Closing\n");
+
+ /* Sanity checks */
+
+ DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
+
+ /* Recover our private data from the struct file instance */
+
+ rf = filep->f_priv;
+ rm = filep->f_inode->i_private;
+
+ DEBUGASSERT(rm != NULL);
+
+ /* Do not check if the mount is healthy. We must support closing of
+ * the file even when there is healthy mount.
+ */
+
+ /* Deallocate the memory structures created when the open method
+ * was called.
+ *
+ * Free the sector buffer that was used to manage partial sector
+ * accesses.
+ */
+
+ if (!rm->rm_xipbase && rf->rf_buffer)
+ {
+ free(rf->rf_buffer);
+ }
+
+ /* Then free the file structure itself. */
+
+ free(rf);
+ filep->f_priv = NULL;
+ return ret;
+}
+
+/****************************************************************************
+ * Name: romfs_read
+ ****************************************************************************/
+
+static ssize_t romfs_read(FAR struct file *filep, char *buffer, size_t buflen)
+{
+ struct romfs_mountpt_s *rm;
+ struct romfs_file_s *rf;
+ unsigned int bytesread;
+ unsigned int readsize;
+ unsigned int nsectors;
+ uint32_t offset;
+ size_t bytesleft;
+ off_t sector;
+ uint8_t *userbuffer = (uint8_t*)buffer;
+ int sectorndx;
+ int ret;
+
+ fvdbg("Read %d bytes from offset %d\n", buflen, filep->f_pos);
+
+ /* Sanity checks */
+
+ DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
+
+ /* Recover our private data from the struct file instance */
+
+ rf = filep->f_priv;
+ rm = filep->f_inode->i_private;
+
+ DEBUGASSERT(rm != NULL);
+
+ /* Make sure that the mount is still healthy */
+
+ romfs_semtake(rm);
+ ret = romfs_checkmount(rm);
+ if (ret != OK)
+ {
+ fdbg("romfs_checkmount failed: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ /* Get the number of bytes left in the file */
+
+ bytesleft = rf->rf_size - filep->f_pos;
+
+ /* Truncate read count so that it does not exceed the number
+ * of bytes left in the file.
+ */
+
+ if (buflen > bytesleft)
+ {
+ buflen = bytesleft;
+ }
+
+ /* Loop until either (1) all data has been transferred, or (2) an
+ * error occurs.
+ */
+
+ readsize = 0;
+ while (buflen > 0)
+ {
+ /* Get the first sector and index to read from. */
+
+ offset = rf->rf_startoffset + filep->f_pos;
+ sector = SEC_NSECTORS(rm, offset);
+ sectorndx = offset & SEC_NDXMASK(rm);
+ bytesread = 0;
+
+ /* Check if the user has provided a buffer large enough to
+ * hold one or more complete sectors -AND- the read is
+ * aligned to a sector boundary.
+ */
+
+ nsectors = SEC_NSECTORS(rm, buflen);
+ if (nsectors > 0 && sectorndx == 0)
+ {
+ /* Read maximum contiguous sectors directly to the user's
+ * buffer without using our tiny read buffer.
+ */
+
+ /* Read all of the sectors directly into user memory */
+
+ fvdbg("Read %d sectors starting with %d\n", nsectors, sector);
+ ret = romfs_hwread(rm, userbuffer, sector, nsectors);
+ if (ret < 0)
+ {
+ fdbg("romfs_hwread failed: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ sector += nsectors;
+ bytesread = nsectors * rm->rm_hwsectorsize;
+ }
+ else
+ {
+ /* We are reading a partial sector. First, read the whole sector
+ * into the file data buffer. This is a caching buffer so if
+ * it is already there then all is well.
+ */
+
+ fvdbg("Read sector %d\n", sector);
+ ret = romfs_filecacheread(rm, rf, sector);
+ if (ret < 0)
+ {
+ fdbg("romfs_filecacheread failed: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ /* Copy the partial sector into the user buffer */
+
+ bytesread = rm->rm_hwsectorsize - sectorndx;
+ if (bytesread > buflen)
+ {
+ /* We will not read to the end of the buffer */
+
+ bytesread = buflen;
+ }
+ else
+ {
+ /* We will read to the end of the buffer (or beyond) */
+
+ sector++;
+ }
+
+ fvdbg("Return %d bytes from sector offset %d\n", bytesread, sectorndx);
+ memcpy(userbuffer, &rf->rf_buffer[sectorndx], bytesread);
+ }
+
+ /* Set up for the next sector read */
+
+ userbuffer += bytesread;
+ filep->f_pos += bytesread;
+ readsize += bytesread;
+ buflen -= bytesread;
+ }
+
+ romfs_semgive(rm);
+ return readsize;
+
+errout_with_semaphore:
+ romfs_semgive(rm);
+ return ret;
+}
+
+/****************************************************************************
+ * Name: romfs_seek
+ ****************************************************************************/
+
+static off_t romfs_seek(FAR struct file *filep, off_t offset, int whence)
+{
+ struct romfs_mountpt_s *rm;
+ struct romfs_file_s *rf;
+ off_t position;
+ int ret;
+
+ fvdbg("Seek to offset: %d whence: %d\n", offset, whence);
+
+ /* Sanity checks */
+
+ DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
+
+ /* Recover our private data from the struct file instance */
+
+ rf = filep->f_priv;
+ rm = filep->f_inode->i_private;
+
+ DEBUGASSERT(rm != NULL);
+
+ /* Map the offset according to the whence option */
+
+ switch (whence)
+ {
+ case SEEK_SET: /* The offset is set to offset bytes. */
+ position = offset;
+ break;
+
+ case SEEK_CUR: /* The offset is set to its current location plus
+ * offset bytes. */
+
+ position = offset + filep->f_pos;
+ break;
+
+ case SEEK_END: /* The offset is set to the size of the file plus
+ * offset bytes. */
+
+ position = offset + rf->rf_size;
+ break;
+
+ default:
+ fdbg("Whence is invalid: %d\n", whence);
+ return -EINVAL;
+ }
+
+ /* Make sure that the mount is still healthy */
+
+ romfs_semtake(rm);
+ ret = romfs_checkmount(rm);
+ if (ret != OK)
+ {
+ fdbg("romfs_checkmount failed: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ /* Limit positions to the end of the file. */
+
+ if (position > rf->rf_size)
+ {
+ /* Otherwise, the position is limited to the file size */
+
+ position = rf->rf_size;
+ }
+
+ /* Set file position and return success */
+
+ filep->f_pos = position;
+ fvdbg("New file position: %d\n", filep->f_pos);
+
+ romfs_semgive(rm);
+ return OK;
+
+errout_with_semaphore:
+ romfs_semgive(rm);
+ return ret;
+}
+
+/****************************************************************************
+ * Name: romfs_ioctl
+ ****************************************************************************/
+
+static int romfs_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
+{
+ struct romfs_mountpt_s *rm;
+ struct romfs_file_s *rf;
+ FAR void **ppv = (FAR void**)arg;
+
+ fvdbg("cmd: %d arg: %08lx\n", cmd, arg);
+
+ /* Sanity checks */
+
+ DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
+
+ /* Recover our private data from the struct file instance */
+
+ rf = filep->f_priv;
+ rm = filep->f_inode->i_private;
+
+ DEBUGASSERT(rm != NULL);
+
+ /* Only one ioctl command is supported */
+
+ if (cmd == FIOC_MMAP && rm->rm_xipbase && ppv)
+ {
+ /* Return the address on the media corresponding to the start of
+ * the file.
+ */
+
+ *ppv = (void*)(rm->rm_xipbase + rf->rf_startoffset);
+ return OK;
+ }
+
+ fdbg("Invalid cmd: %d \n", cmd);
+ return -ENOTTY;
+}
+
+/****************************************************************************
+ * Name: romfs_opendir
+ *
+ * Description:
+ * Open a directory for read access
+ *
+ ****************************************************************************/
+
+static int romfs_opendir(struct inode *mountpt, const char *relpath,
+ struct fs_dirent_s *dir)
+{
+ struct romfs_mountpt_s *rm;
+ struct romfs_dirinfo_s dirinfo;
+ int ret;
+
+ fvdbg("relpath: '%s'\n", relpath);
+
+ /* Sanity checks */
+
+ DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
+
+ /* Recover our private data from the inode instance */
+
+ rm = mountpt->i_private;
+
+ /* Make sure that the mount is still healthy */
+
+ romfs_semtake(rm);
+ ret = romfs_checkmount(rm);
+ if (ret != OK)
+ {
+ fdbg("romfs_checkmount failed: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ /* Find the requested directory */
+
+ ret = romfs_finddirentry(rm, &dirinfo, relpath);
+ if (ret < 0)
+ {
+ fdbg("Failed to find directory '%s': %d\n", relpath, ret);
+ goto errout_with_semaphore;
+ }
+
+ /* Verify that it is some kind of directory */
+
+ if (!IS_DIRECTORY(dirinfo.rd_next))
+ {
+ /* The entry is not a directory */
+
+ fdbg("'%s' is not a directory: %d\n", relpath);
+ ret = -ENOTDIR;
+ goto errout_with_semaphore;
+ }
+
+ /* The entry is a directory */
+
+ memcpy(&dir->u.romfs, &dirinfo.rd_dir, sizeof(struct fs_romfsdir_s));
+ romfs_semgive(rm);
+ return OK;
+
+errout_with_semaphore:
+ romfs_semgive(rm);
+ return ERROR;
+}
+
+/****************************************************************************
+ * Name: romfs_readdir
+ *
+ * Description: Read the next directory entry
+ *
+ ****************************************************************************/
+
+static int romfs_readdir(struct inode *mountpt, struct fs_dirent_s *dir)
+{
+ struct romfs_mountpt_s *rm;
+ uint32_t linkoffset;
+ uint32_t next;
+ uint32_t info;
+ uint32_t size;
+ int ret;
+
+ fvdbg("Entry\n");
+
+ /* Sanity checks */
+
+ DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
+
+ /* Recover our private data from the inode instance */
+
+ rm = mountpt->i_private;
+
+ /* Make sure that the mount is still healthy */
+
+ romfs_semtake(rm);
+ ret = romfs_checkmount(rm);
+ if (ret != OK)
+ {
+ fdbg("romfs_checkmount failed: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ /* Loop, skipping over unsupported items in the file system */
+
+ for (;;)
+ {
+ /* Have we reached the end of the directory */
+
+ if (!dir->u.romfs.fr_curroffset)
+ {
+ /* We signal the end of the directory by returning the
+ * special error -ENOENT
+ */
+
+ fdbg("End of directory\n");
+ ret = -ENOENT;
+ goto errout_with_semaphore;
+ }
+
+ /* Parse the directory entry */
+
+ ret = romfs_parsedirentry(rm, dir->u.romfs.fr_curroffset, &linkoffset,
+ &next, &info, &size);
+ if (ret < 0)
+ {
+ fdbg("romfs_parsedirentry failed: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ /* Save the filename */
+
+ ret = romfs_parsefilename(rm, dir->u.romfs.fr_curroffset, dir->fd_dir.d_name);
+ if (ret < 0)
+ {
+ fdbg("romfs_parsefilename failed: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ /* Set up the next directory entry offset */
+
+ dir->u.romfs.fr_curroffset = next & RFNEXT_OFFSETMASK;
+
+ /* Check the file type */
+
+ if (IS_DIRECTORY(next))
+ {
+ dir->fd_dir.d_type = DTYPE_DIRECTORY;
+ break;
+ }
+ else if (IS_FILE(next))
+ {
+ dir->fd_dir.d_type = DTYPE_FILE;
+ break;
+ }
+ }
+
+errout_with_semaphore:
+ romfs_semgive(rm);
+ return ret;
+}
+
+/****************************************************************************
+ * Name: romfs_rewindir
+ *
+ * Description: Reset directory read to the first entry
+ *
+ ****************************************************************************/
+
+static int romfs_rewinddir(struct inode *mountpt, struct fs_dirent_s *dir)
+{
+ struct romfs_mountpt_s *rm;
+ int ret;
+
+ fvdbg("Entry\n");
+
+ /* Sanity checks */
+
+ DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
+
+ /* Recover our private data from the inode instance */
+
+ rm = mountpt->i_private;
+
+ /* Make sure that the mount is still healthy */
+
+ romfs_semtake(rm);
+ ret = romfs_checkmount(rm);
+ if (ret == OK)
+ {
+ dir->u.romfs.fr_curroffset = dir->u.romfs.fr_firstoffset;
+ }
+
+ romfs_semgive(rm);
+ return ret;
+}
+
+/****************************************************************************
+ * Name: romfs_bind
+ *
+ * Description: This implements a portion of the mount operation. This
+ * function allocates and initializes the mountpoint private data and
+ * binds the blockdriver inode to the filesystem private data. The final
+ * binding of the private data (containing the blockdriver) to the
+ * mountpoint is performed by mount().
+ *
+ ****************************************************************************/
+
+static int romfs_bind(FAR struct inode *blkdriver, const void *data,
+ void **handle)
+{
+ struct romfs_mountpt_s *rm;
+ int ret;
+
+ fvdbg("Entry\n");
+
+ /* Open the block driver */
+
+ if (!blkdriver || !blkdriver->u.i_bops)
+ {
+ fdbg("No block driver/ops\n");
+ return -ENODEV;
+ }
+
+ if (blkdriver->u.i_bops->open &&
+ blkdriver->u.i_bops->open(blkdriver) != OK)
+ {
+ fdbg("No open method\n");
+ return -ENODEV;
+ }
+
+ /* Create an instance of the mountpt state structure */
+
+ rm = (struct romfs_mountpt_s *)zalloc(sizeof(struct romfs_mountpt_s));
+ if (!rm)
+ {
+ fdbg("Failed to allocate mountpoint structure\n");
+ return -ENOMEM;
+ }
+
+ /* Initialize the allocated mountpt state structure. The filesystem is
+ * responsible for one reference ont the blkdriver inode and does not
+ * have to addref() here (but does have to release in ubind().
+ */
+
+ sem_init(&rm->rm_sem, 0, 0); /* Initialize the semaphore that controls access */
+ rm->rm_blkdriver = blkdriver; /* Save the block driver reference */
+
+ /* Get the hardware configuration and setup buffering appropriately */
+
+ ret = romfs_hwconfigure(rm);
+ if (ret < 0)
+ {
+ fdbg("romfs_hwconfigure failed: %d\n", ret);
+ goto errout_with_sem;
+ }
+
+ /* Then complete the mount by getting the ROMFS configuratrion from
+ * the ROMF header
+ */
+
+ ret = romfs_fsconfigure(rm);
+ if (ret < 0)
+ {
+ fdbg("romfs_fsconfigure failed: %d\n", ret);
+ goto errout_with_buffer;
+ }
+
+ /* Mounted! */
+
+ *handle = (void*)rm;
+ romfs_semgive(rm);
+ return OK;
+
+errout_with_buffer:
+ if (!rm->rm_xipbase)
+ {
+ free(rm->rm_buffer);
+ }
+
+errout_with_sem:
+ sem_destroy(&rm->rm_sem);
+ free(rm);
+ return ret;
+}
+
+/****************************************************************************
+ * Name: romfs_unbind
+ *
+ * Description: This implements the filesystem portion of the umount
+ * operation.
+ *
+ ****************************************************************************/
+
+static int romfs_unbind(void *handle, FAR struct inode **blkdriver)
+{
+ struct romfs_mountpt_s *rm = (struct romfs_mountpt_s*)handle;
+ int ret;
+
+ fvdbg("Entry\n");
+
+#ifdef CONFIG_DEBUG
+ if (!rm)
+ {
+ return -EINVAL;
+ }
+#endif
+
+ /* Check if there are sill any files opened on the filesystem. */
+
+ romfs_semtake(rm);
+ if (rm->rm_head)
+ {
+ /* We cannot unmount now.. there are open files */
+
+ fdbg("There are open files\n");
+ ret = -EBUSY;
+ }
+ else
+ {
+ /* Unmount ... close the block driver */
+
+ if (rm->rm_blkdriver)
+ {
+ struct inode *inode = rm->rm_blkdriver;
+ if (inode)
+ {
+ if (inode->u.i_bops && inode->u.i_bops->close)
+ {
+ (void)inode->u.i_bops->close(inode);
+ }
+
+ /* We hold a reference to the block driver but should
+ * not but mucking with inodes in this context. So, we will just return
+ * our contained reference to the block driver inode and let the umount
+ * logic dispose of it.
+ */
+
+ if (blkdriver)
+ {
+ *blkdriver = inode;
+ }
+ }
+ }
+
+ /* Release the mountpoint private data */
+
+ if (!rm->rm_xipbase && rm->rm_buffer)
+ {
+ free(rm->rm_buffer);
+ }
+
+ sem_destroy(&rm->rm_sem);
+ free(rm);
+ return OK;
+ }
+
+ romfs_semgive(rm);
+ return ret;
+}
+
+/****************************************************************************
+ * Name: romfs_statfs
+ *
+ * Description: Return filesystem statistics
+ *
+ ****************************************************************************/
+
+static int romfs_statfs(struct inode *mountpt, struct statfs *buf)
+{
+ struct romfs_mountpt_s *rm;
+ int ret;
+
+ fvdbg("Entry\n");
+
+ /* Sanity checks */
+
+ DEBUGASSERT(mountpt && mountpt->i_private);
+
+ /* Get the mountpoint private data from the inode structure */
+
+ rm = mountpt->i_private;
+
+ /* Check if the mount is still healthy */
+
+ romfs_semtake(rm);
+ ret = romfs_checkmount(rm);
+ if (ret < 0)
+ {
+ fdbg("romfs_checkmount failed: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ /* Fill in the statfs info */
+
+ memset(buf, 0, sizeof(struct statfs));
+ buf->f_type = ROMFS_MAGIC;
+
+ /* We will claim that the optimal transfer size is the size of one sector */
+
+ buf->f_bsize = rm->rm_hwsectorsize;
+
+ /* Everything else follows in units of sectors */
+
+ buf->f_blocks = SEC_NSECTORS(rm, rm->rm_volsize + SEC_NDXMASK(rm));
+ buf->f_bfree = 0;
+ buf->f_bavail = 0;
+ buf->f_namelen = NAME_MAX;
+
+ romfs_semgive(rm);
+ return OK;
+
+errout_with_semaphore:
+ romfs_semgive(rm);
+ return ret;
+}
+
+/****************************************************************************
+ * Name: romfs_stat
+ *
+ * Description: Return information about a file or directory
+ *
+ ****************************************************************************/
+
+static int romfs_stat(struct inode *mountpt, const char *relpath, struct stat *buf)
+{
+ struct romfs_mountpt_s *rm;
+ struct romfs_dirinfo_s dirinfo;
+ int ret;
+
+ fvdbg("Entry\n");
+
+ /* Sanity checks */
+
+ DEBUGASSERT(mountpt && mountpt->i_private);
+
+ /* Get the mountpoint private data from the inode structure */
+
+ rm = mountpt->i_private;
+
+ /* Check if the mount is still healthy */
+
+ romfs_semtake(rm);
+ ret = romfs_checkmount(rm);
+ if (ret != OK)
+ {
+ fdbg("romfs_checkmount failed: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ /* Find the directory entry corresponding to relpath. */
+
+ ret = romfs_finddirentry(rm, &dirinfo, relpath);
+
+ /* If nothing was found, then we fail with EEXIST */
+
+ if (ret < 0)
+ {
+ fvdbg("Failed to find directory: %d\n", ret);
+ goto errout_with_semaphore;
+ }
+
+ memset(buf, 0, sizeof(struct stat));
+ if (IS_DIRECTORY(dirinfo.rd_next))
+ {
+ /* It's a read-only directory name */
+
+ buf->st_mode = S_IFDIR|S_IROTH|S_IRGRP|S_IRUSR;
+ if (IS_EXECUTABLE(dirinfo.rd_next))
+ {
+ buf->st_mode |= S_IXOTH|S_IXGRP|S_IXUSR;
+ }
+ }
+ else if (IS_FILE(dirinfo.rd_next))
+ {
+ /* It's a read-only file name */
+
+ buf->st_mode = S_IFREG|S_IROTH|S_IRGRP|S_IRUSR;
+ if (IS_EXECUTABLE(dirinfo.rd_next))
+ {
+ buf->st_mode |= S_IXOTH|S_IXGRP|S_IXUSR;
+ }
+ }
+ else
+ {
+ /* Otherwise, pretend like the unsupported node does not exist */
+
+ fvdbg("Unsupported inode: %d\n", dirinfo.rd_next);
+ ret = -ENOENT;
+ goto errout_with_semaphore;
+ }
+
+ /* File/directory size, access block size */
+
+ buf->st_size = dirinfo.rd_size;
+ buf->st_blksize = rm->rm_hwsectorsize;
+ buf->st_blocks = (buf->st_size + buf->st_blksize - 1) / buf->st_blksize;
+
+ ret = OK;
+
+errout_with_semaphore:
+ romfs_semgive(rm);
+ return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-22 00:38:45 +0000