diff options
Diffstat (limited to 'nuttx/fs/romfs/fs_romfs.c')
| -rw-r--r-- | nuttx/fs/romfs/fs_romfs.c | 1194 |
1 files changed, 0 insertions, 1194 deletions
diff --git a/nuttx/fs/romfs/fs_romfs.c b/nuttx/fs/romfs/fs_romfs.c deleted file mode 100644 index 6a6fca355..000000000 --- a/nuttx/fs/romfs/fs_romfs.c +++ /dev/null @@ -1,1194 +0,0 @@ -/**************************************************************************** - * rm/romfs/fs_romfs.h - * - * Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * 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/kmalloc.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, FAR 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, FAR 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_dup(FAR const struct file *oldp, FAR struct file *newp); - -static int romfs_opendir(FAR struct inode *mountpt, - FAR const char *relpath, - FAR struct fs_dirent_s *dir); -static int romfs_readdir(FAR struct inode *mountpt, - FAR struct fs_dirent_s *dir); -static int romfs_rewinddir(FAR struct inode *mountpt, - FAR struct fs_dirent_s *dir); - -static int romfs_bind(FAR struct inode *blkdriver, FAR const void *data, - FAR void **handle); -static int romfs_unbind(FAR void *handle, FAR struct inode **blkdriver); -static int romfs_statfs(FAR struct inode *mountpt, - FAR struct statfs *buf); - -static int romfs_stat(FAR struct inode *mountpt, FAR const char *relpath, - FAR 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_dup, /* dup */ - - 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, FAR const char *relpath, - int oflags, mode_t mode) -{ - struct romfs_dirinfo_s dirinfo; - FAR struct romfs_mountpt_s *rm; - FAR struct romfs_file_s *rf; - int ret; - - fvdbg("Open '%s'\n", relpath); - - /* Sanity checks */ - - DEBUGASSERT(filep->f_priv == NULL && filep->f_inode != NULL); - - /* Get mountpoint private data from the inode reference from the file - * structure - */ - - rm = (FAR 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 = (FAR struct romfs_file_s *)kzalloc(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_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) -{ - FAR struct romfs_mountpt_s *rm; - FAR 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) - { - kfree(rf->rf_buffer); - } - - /* Then free the file structure itself. */ - - kfree(rf); - filep->f_priv = NULL; - return ret; -} - -/**************************************************************************** - * Name: romfs_read - ****************************************************************************/ - -static ssize_t romfs_read(FAR struct file *filep, FAR char *buffer, - size_t buflen) -{ - FAR struct romfs_mountpt_s *rm; - FAR struct romfs_file_s *rf; - unsigned int bytesread; - unsigned int readsize; - unsigned int nsectors; - uint32_t offset; - size_t bytesleft; - off_t sector; - FAR uint8_t *userbuffer = (FAR 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) -{ - FAR struct romfs_mountpt_s *rm; - FAR 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) -{ - FAR struct romfs_mountpt_s *rm; - FAR 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_dup - ****************************************************************************/ - -static int romfs_dup(FAR const struct file *oldp, FAR struct file *newp) -{ - FAR struct romfs_mountpt_s *rm; - FAR struct romfs_file_s *oldrf; - FAR struct romfs_file_s *newrf; - int ret; - - fvdbg("Dup %p->%p\n", oldp, newp); - - /* Sanity checks */ - - DEBUGASSERT(oldp->f_priv != NULL && - newp->f_priv == NULL && - newp->f_inode != NULL); - - /* Get mountpoint private data from the inode reference from the file - * structure - */ - - rm = (FAR struct romfs_mountpt_s*)newp->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; - } - - /* Recover the old private data from the old struct file instance */ - - oldrf = oldp->f_priv; - - /* Create an new instance of the file private data to describe the new - * dup'ed file. - */ - - newrf = (FAR struct romfs_file_s *)kmalloc(sizeof(struct romfs_file_s)); - if (!newrf) - { - fdbg("Failed to allocate private data\n", ret); - ret = -ENOMEM; - goto errout_with_semaphore; - } - - /* Copy all file private data (except for the buffer) */ - - newrf->rf_startoffset = oldrf->rf_startoffset; - newrf->rf_size = oldrf->rf_size; - - /* Configure buffering to support access to this file */ - - ret = romfs_fileconfigure(rm, newrf); - if (ret < 0) - { - fdbg("Failed configure buffering: %d\n", ret); - goto errout_with_semaphore; - } - - /* Attach the new private date to the new struct file instance */ - - newp->f_priv = newrf; - - /* 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). - */ - - newrf->rf_next = rm->rm_head; - rm->rm_head = newrf->rf_next; - - romfs_semgive(rm); - return OK; - - /* Error exits */ - -errout_with_semaphore: - romfs_semgive(rm); - return ret; -} - -/**************************************************************************** - * Name: romfs_opendir - * - * Description: - * Open a directory for read access - * - ****************************************************************************/ - -static int romfs_opendir(FAR struct inode *mountpt, FAR const char *relpath, - FAR struct fs_dirent_s *dir) -{ - FAR struct romfs_mountpt_s *rm; - FAR 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(FAR struct inode *mountpt, - FAR struct fs_dirent_s *dir) -{ - FAR 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(FAR struct inode *mountpt, - FAR struct fs_dirent_s *dir) -{ - FAR 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, FAR const void *data, - FAR 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 = (FAR struct romfs_mountpt_s *)kzalloc(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) - { - kfree(rm->rm_buffer); - } - -errout_with_sem: - sem_destroy(&rm->rm_sem); - kfree(rm); - return ret; -} - -/**************************************************************************** - * Name: romfs_unbind - * - * Description: This implements the filesystem portion of the umount - * operation. - * - ****************************************************************************/ - -static int romfs_unbind(FAR void *handle, FAR struct inode **blkdriver) -{ - FAR struct romfs_mountpt_s *rm = (FAR 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) - { - kfree(rm->rm_buffer); - } - - sem_destroy(&rm->rm_sem); - kfree(rm); - return OK; - } - - romfs_semgive(rm); - return ret; -} - -/**************************************************************************** - * Name: romfs_statfs - * - * Description: Return filesystem statistics - * - ****************************************************************************/ - -static int romfs_statfs(FAR struct inode *mountpt, FAR struct statfs *buf) -{ - FAR 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(FAR struct inode *mountpt, FAR const char *relpath, - FAR struct stat *buf) -{ - FAR struct romfs_mountpt_s *rm; - FAR 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 - ****************************************************************************/ |