/**************************************************************************** * rm/romfs/fs_romfs.h * * Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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, unsigned int flags); 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 Data ****************************************************************************/ /* 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 *)kmm_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_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) { kmm_free(rf->rf_buffer); } /* Then free the file structure itself. */ kmm_free(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 = (FAR 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 *)kmm_malloc(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) { kmm_free(newrf); 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 ret; } /**************************************************************************** * 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 *)kmm_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 = (FAR void *)rm; romfs_semgive(rm); return OK; errout_with_buffer: if (!rm->rm_xipbase) { kmm_free(rm->rm_buffer); } errout_with_sem: sem_destroy(&rm->rm_sem); kmm_free(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, unsigned int flags) { 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"); /* This implementation currently only supports unmounting if there are * no open file references. */ ret = (flags != 0) ? -ENOSYS : -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) { kmm_free(rm->rm_buffer); } sem_destroy(&rm->rm_sem); kmm_free(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 ****************************************************************************/