static inline int nxffs_wrname(FAR struct nxffs_volume_s *volume,
FAR struct nxffs_entry_s *entry,
int namlen)
{
int ret;
/* Seek to the inode name position and assure that it is in the volume
* cache.
*/
nxffs_ioseek(volume, entry->noffset);
ret = nxffs_rdcache(volume, volume->ioblock);
if (ret < 0)
{
fdbg("ERROR: Failed to read inode name block %d: %d\n",
volume->ioblock, -ret);
return ret;
}
/* Copy the inode name to the volume cache and write the inode name block */
memcpy(&volume->cache[volume->iooffset], entry->name, namlen);
ret = nxffs_wrcache(volume);
if (ret < 0)
{
fdbg("ERROR: Failed to write inode header block %d: %d\n",
volume->ioblock, -ret);
}
return ret;
}
int nxffs_rdblkhdr(FAR struct nxffs_volume_s *volume, off_t offset,
FAR uint16_t *datlen)
{
struct nxffs_data_s blkhdr;
uint32_t ecrc;
uint32_t crc;
uint16_t doffset;
uint16_t dlen;
int ret;
/* Make sure that the block containing the data block header is in the cache */
nxffs_ioseek(volume, offset);
ret = nxffs_rdcache(volume, volume->ioblock);
if (ret < 0)
{
fdbg("ERROR: Failed to read data into cache: %d\n", ret);
return ret;
}
/* Read the header at the FLASH offset */
doffset = volume->iooffset;
memcpy(&blkhdr, &volume->cache[doffset], SIZEOF_NXFFS_DATA_HDR);
/* Extract the data length */
dlen = nxffs_rdle16(blkhdr.datlen);
/* Get the offset to the beginning of the data */
doffset += SIZEOF_NXFFS_DATA_HDR;
/* Make sure that all of the data fits within the block */
if ((uint32_t)doffset + (uint32_t)dlen > (uint32_t)volume->geo.blocksize)
{
fdbg("ERROR: Data length=%d is unreasonable at offset=%d\n", dlen, doffset);
return -EIO;
}
/* Extract the expected CRC and calculate the CRC of the data block */
ecrc = nxffs_rdle32(blkhdr.crc);
nxffs_wrle32(blkhdr.crc, 0);
crc = crc32((FAR const uint8_t *)&blkhdr, SIZEOF_NXFFS_DATA_HDR);
crc = crc32part(&volume->cache[doffset], dlen, crc);
if (crc != ecrc)
{
fdbg("ERROR: CRC failure\n");
return -EIO;
}
/* Looks good! Return the data length and success */
*datlen = dlen;
return OK;
}
int nxffs_wrinode(FAR struct nxffs_volume_s *volume,
FAR struct nxffs_entry_s *entry)
{
FAR struct nxffs_inode_s *inode;
uint32_t crc;
int namlen;
int ret;
/* Seek to the inode header position and assure that it is in the volume
* cache.
*/
nxffs_ioseek(volume, entry->hoffset);
ret = nxffs_rdcache(volume, volume->ioblock);
if (ret < 0)
{
fdbg("ERROR: Failed to read inode header block %d: %d\n",
volume->ioblock, -ret);
goto errout;
}
/* Get the length of the inode name */
namlen = strlen(entry->name);
DEBUGASSERT(namlen < CONFIG_NXFFS_MAXNAMLEN); /* This was verified earlier */
/* Initialize the inode header */
inode = (FAR struct nxffs_inode_s *)&volume->cache[volume->iooffset];
memcpy(inode->magic, g_inodemagic, NXFFS_MAGICSIZE);
inode->state = CONFIG_NXFFS_ERASEDSTATE;
inode->namlen = namlen;
nxffs_wrle32(inode->noffs, entry->noffset);
nxffs_wrle32(inode->doffs, entry->doffset);
nxffs_wrle32(inode->utc, entry->utc);
nxffs_wrle32(inode->crc, 0);
nxffs_wrle32(inode->datlen, entry->datlen);
/* Calculate the CRC */
crc = crc32((FAR const uint8_t *)inode, SIZEOF_NXFFS_INODE_HDR);
crc = crc32part((FAR const uint8_t *)entry->name, namlen, crc);
/* Finish the inode header */
inode->state = INODE_STATE_FILE;
nxffs_wrle32(inode->crc, crc);
/* Write the block with the inode header */
ret = nxffs_wrcache(volume);
if (ret < 0)
{
fdbg("ERROR: Failed to write inode header block %d: %d\n",
volume->ioblock, -ret);
}
/* The volume is now available for other writers */
errout:
sem_post(&volume->wrsem);
return ret;
}
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 that 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;
}
int nxffs_wrverify(FAR struct nxffs_volume_s *volume, size_t size)
{
uint16_t iooffset;
int nerased;
int ret;
int i;
/* Search to the very last block in the volume if we have to */
while (volume->ioblock < volume->nblocks)
{
/* Make sure that the block is in memory */
ret = nxffs_rdcache(volume, volume->ioblock);
if (ret < 0)
{
/* Ignore the error... just skip to the next block. This should
* never happen with normal FLASH, but could occur with NAND if
* the block has uncorrectable bit errors.
*/
fdbg("ERROR: Failed to read block %d: %d\n",
volume->ioblock, -ret);
}
/* Search to the very end of this block if we have to */
else
{
iooffset = volume->iooffset;
nerased = 0;
for (i = volume->iooffset; i < volume->geo.blocksize; i++)
{
/* Is this byte erased? */
if (volume->cache[i] == CONFIG_NXFFS_ERASEDSTATE)
{
/* Yes.. increment the count of contiguous, erased bytes */
nerased++;
/* Is the whole header memory erased? */
if (nerased >= size)
{
/* Yes.. this this is where we will put the object */
off_t offset =
volume->ioblock * volume->geo.blocksize + iooffset;
/* Update the free flash offset and return success */
volume->froffset = offset + size;
return OK;
}
}
/* This byte is not erased! (It should be unless the block is
* bad)
*/
else
{
nerased = 0;
iooffset = i + 1;
}
}
}
/* If we get here, then either (1) this block is not read-able, or
* (2) we have looked at every byte in the block and did not find
* any sequence of erased bytes long enough to hold the object.
* Skip to the next, valid block.
*/
volume->ioblock++;
ret = nxffs_validblock(volume, &volume->ioblock);
if (ret < 0)
{
fdbg("ERROR: No more valid blocks\n");
return ret;
}
volume->iooffset = SIZEOF_NXFFS_BLOCK_HDR;
volume->froffset = volume->ioblock * volume->geo.blocksize + SIZEOF_NXFFS_BLOCK_HDR;
}
/* Return -ENOSPC if there is no erased memory left in the volume for
* the object.
*/
fdbg("ERROR: Not enough memory left to hold the file header\n");
return -ENOSPC;
}
static int nxffs_rdentry(FAR struct nxffs_volume_s *volume, off_t offset,
FAR struct nxffs_entry_s *entry)
{
struct nxffs_inode_s inode;
uint32_t ecrc;
uint32_t crc;
uint8_t state;
int namlen;
int ret;
DEBUGASSERT(volume && entry);
memset(entry, 0, sizeof(struct nxffs_entry_s));
/* Read the header at the FLASH offset */
nxffs_ioseek(volume, offset);
memcpy(&inode, &volume->cache[volume->iooffset], SIZEOF_NXFFS_INODE_HDR);
/* Check if the file state is recognized. */
state = inode.state;
if (state != INODE_STATE_FILE && state != INODE_STATE_DELETED)
{
/* This can't be a valid inode.. don't bother with the rest */
ret = -ENOENT;
goto errout_no_offset;
}
/* Copy the packed header into the user-friendly buffer */
entry->hoffset = offset;
entry->noffset = nxffs_rdle32(inode.noffs);
entry->doffset = nxffs_rdle32(inode.doffs);
entry->utc = nxffs_rdle32(inode.utc);
entry->datlen = nxffs_rdle32(inode.datlen);
/* Modify the packed header and perform the (partial) CRC calculation */
ecrc = nxffs_rdle32(inode.crc);
inode.state = CONFIG_NXFFS_ERASEDSTATE;
memset(inode.crc, 0, 4);
crc = crc32((FAR const uint8_t *)&inode, SIZEOF_NXFFS_INODE_HDR);
/* Allocate memory to hold the variable-length file name */
namlen = inode.namlen;
entry->name = (FAR char *)kmalloc(namlen + 1);
if (!entry->name)
{
fdbg("ERROR: Failed to allocate name, namlen: %d\n", namlen);
ret = -ENOMEM;
goto errout_no_offset;
}
/* Seek to the expected location of the name in FLASH */
nxffs_ioseek(volume, entry->noffset);
/* Make sure that the block is in memory (the name may not be in the
* same block as the inode header.
*/
ret = nxffs_rdcache(volume, volume->ioblock);
if (ret < 0)
{
fdbg("ERROR: nxffsx_rdcache failed: %d\n", -ret);
goto errout_with_name;
}
/* Read the file name from the expected offset in FLASH */
memcpy(entry->name, &volume->cache[volume->iooffset], namlen);
entry->name[namlen] = '\0';
/* Finish the CRC calculation and verify the entry */
crc = crc32part((FAR const uint8_t *)entry->name, namlen, crc);
if (crc != ecrc)
{
fdbg("ERROR: CRC entry: %08x CRC calculated: %08x\n", ecrc, crc);
ret = -EIO;
goto errout_with_name;
}
/* We have a good inode header.. but it still could a deleted file.
* Check the file state.
*/
if (state != INODE_STATE_FILE)
{
/* It is a deleted file. But still, the data offset and the
* start size are good so we can use this information to advance
* further in FLASH memory and reduce the search time.
*/
offset = nxffs_inodeend(volume, entry);
nxffs_freeentry(entry);
ret = -ENOENT;
goto errout;
}
/* Everything is good.. leave the offset pointing to the valid inode
* header.
*/
return OK;
/* On errors where we are suspicious of the validity of the inode header,
* we need to increment the file position to just after the "good" magic
* word.
*/
errout_with_name:
nxffs_freeentry(entry);
errout_no_offset:
offset += NXFFS_MAGICSIZE;
errout:
nxffs_ioseek(volume, offset);
return ret;
}