/* Write to quotafile */
static ssize_t ext2_quota_write(struct super_block *sb, int type,
const char *data, size_t len, loff_t off)
{
struct inode *inode = sb_dqopt(sb)->files[type];
sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
int err = 0;
int offset = off & (sb->s_blocksize - 1);
int tocopy;
size_t towrite = len;
struct buffer_head tmp_bh;
struct buffer_head *bh;
mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
while (towrite > 0) {
tocopy = sb->s_blocksize - offset < towrite ?
sb->s_blocksize - offset : towrite;
tmp_bh.b_state = 0;
err = ext2_get_block(inode, blk, &tmp_bh, 1);
if (err < 0)
goto out;
if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
bh = sb_bread(sb, tmp_bh.b_blocknr);
else
bh = sb_getblk(sb, tmp_bh.b_blocknr);
if (!bh) {
err = -EIO;
goto out;
}
lock_buffer(bh);
memcpy(bh->b_data+offset, data, tocopy);
flush_dcache_page(bh->b_page);
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
unlock_buffer(bh);
brelse(bh);
offset = 0;
towrite -= tocopy;
data += tocopy;
blk++;
}
out:
if (len == towrite) {
mutex_unlock(&inode->i_mutex);
return err;
}
if (inode->i_size < off+len-towrite)
i_size_write(inode, off+len-towrite);
inode->i_version++;
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(inode);
mutex_unlock(&inode->i_mutex);
return len - towrite;
}
/*
* This clever recursive function handles i_blocks[] as well as
* indirect, double indirect, and triple indirect blocks. It iterates
* over the entries in the i_blocks array or indirect blocks, and for
* each one, will recursively handle any indirect blocks and then
* frees and deallocates the blocks.
*/
static errcode_t ind_punch(ext2_filsys fs, struct ext2_inode *inode,
char *block_buf, blk_t *p, int level,
blk_t start, blk_t count, int max)
{
errcode_t retval;
blk_t b;
int i;
blk64_t offset, incr;
int freed = 0;
#ifdef PUNCH_DEBUG
printf("Entering ind_punch, level %d, start %u, count %u, "
"max %d\n", level, start, count, max);
#endif
incr = 1ULL << ((EXT2_BLOCK_SIZE_BITS(fs->super)-2)*level);
for (i=0, offset=0; i < max; i++, p++, offset += incr) {
if (offset >= start + count)
break;
if (*p == 0 || (offset+incr) <= start)
continue;
b = *p;
if (level > 0) {
blk_t start2;
#ifdef PUNCH_DEBUG
printf("Reading indirect block %u\n", b);
#endif
retval = ext2fs_read_ind_block(fs, b, block_buf);
if (retval)
return retval;
start2 = (start > offset) ? start - offset : 0;
retval = ind_punch(fs, inode, block_buf + fs->blocksize,
(blk_t *) block_buf, level - 1,
start2, count - offset,
fs->blocksize >> 2);
if (retval)
return retval;
retval = ext2fs_write_ind_block(fs, b, block_buf);
if (retval)
return retval;
if (!check_zero_block(block_buf, fs->blocksize))
continue;
}
#ifdef PUNCH_DEBUG
printf("Freeing block %u (offset %llu)\n", b, offset);
#endif
ext2fs_block_alloc_stats(fs, b, -1);
*p = 0;
freed++;
}
/* Read data from quotafile - avoid pagecache and such because we cannot afford
* acquiring the locks... As quota files are never truncated and quota code
* itself serializes the operations (and noone else should touch the files)
* we don't have to be afraid of races */
static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
size_t len, loff_t off)
{
struct inode *inode = sb_dqopt(sb)->files[type];
sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
int err = 0;
int offset = off & (sb->s_blocksize - 1);
int tocopy;
size_t toread;
struct buffer_head tmp_bh;
struct buffer_head *bh;
loff_t i_size = i_size_read(inode);
if (off > i_size)
return 0;
if (off+len > i_size)
len = i_size-off;
toread = len;
while (toread > 0) {
tocopy = sb->s_blocksize - offset < toread ?
sb->s_blocksize - offset : toread;
tmp_bh.b_state = 0;
tmp_bh.b_size = sb->s_blocksize;
err = ext2_get_block(inode, blk, &tmp_bh, 0);
if (err < 0)
return err;
if (!buffer_mapped(&tmp_bh)) /* A hole? */
memset(data, 0, tocopy);
else {
bh = sb_bread(sb, tmp_bh.b_blocknr);
if (!bh)
return -EIO;
memcpy(data, bh->b_data+offset, tocopy);
brelse(bh);
}
offset = 0;
toread -= tocopy;
data += tocopy;
blk++;
}
return len;
}
static int bext2_file_write (struct inode * inode, struct file * filp,
const char * buf, int count)
{
const loff_t two_gb = 2147483647;
loff_t pos;
off_t pos2;
long block;
int offset;
int written, c;
struct buffer_head * bh, *bufferlist[NBUF];
struct super_block * sb;
int err;
int i,buffercount,write_error;
write_error = buffercount = 0;
if (!inode) {
printk("bext2_file_write: inode = NULL\n");
return -EINVAL;
}
sb = inode->i_sb;
if (sb->s_flags & MS_RDONLY)
/*
* This fs has been automatically remounted ro because of errors
*/
return -ENOSPC;
if (!S_ISREG(inode->i_mode)) {
bext2_warning (sb, "bext2_file_write", "mode = %07o",
inode->i_mode);
return -EINVAL;
}
if (filp->f_flags & O_APPEND)
pos = inode->i_size;
else
pos = filp->f_pos;
pos2 = (off_t) pos;
/*
* If a file has been opened in synchronous mode, we have to ensure
* that meta-data will also be written synchronously. Thus, we
* set the i_osync field. This field is tested by the allocation
* routines.
*/
if (filp->f_flags & O_SYNC)
inode->u.ext2_i.i_osync++;
block = pos2 >> EXT2_BLOCK_SIZE_BITS(sb);
offset = pos2 & (sb->s_blocksize - 1);
c = sb->s_blocksize - offset;
written = 0;
while (count > 0) {
if (pos > two_gb) {
if (!written)
written = -EFBIG;
break;
}
bh = bext2_getblk (inode, block, 1, &err);
if (!bh) {
if (!written)
written = err;
break;
}
count -= c;
if (count < 0)
c += count;
if (c != sb->s_blocksize && !buffer_uptodate(bh)) {
ll_rw_block (READ, 1, &bh);
wait_on_buffer (bh);
if (!buffer_uptodate(bh)) {
brelse (bh);
if (!written)
written = -EIO;
break;
}
}
memcpy_fromfs (bh->b_data + offset, buf, c);
update_vm_cache(inode, pos, bh->b_data + offset, c);
pos2 += c;
pos += c;
written += c;
buf += c;
mark_buffer_uptodate(bh, 1);
mark_buffer_dirty(bh, 0);
if (filp->f_flags & O_SYNC)
bufferlist[buffercount++] = bh;
else
brelse(bh);
if (buffercount == NBUF){
ll_rw_block(WRITE, buffercount, bufferlist);
for(i=0; i<buffercount; i++){
wait_on_buffer(bufferlist[i]);
if (!buffer_uptodate(bufferlist[i]))
write_error=1;
brelse(bufferlist[i]);
}
buffercount=0;
}
if(write_error)
break;
block++;
offset = 0;
c = sb->s_blocksize;
}
if ( buffercount ){
ll_rw_block(WRITE, buffercount, bufferlist);
for(i=0; i<buffercount; i++){
wait_on_buffer(bufferlist[i]);
if (!buffer_uptodate(bufferlist[i]))
write_error=1;
brelse(bufferlist[i]);
}
}
if (pos > inode->i_size)
inode->i_size = pos;
if (filp->f_flags & O_SYNC)
inode->u.ext2_i.i_osync--;
inode->i_ctime = inode->i_mtime = CURRENT_TIME;
filp->f_pos = pos;
inode->i_dirt = 1;
return written;
}
static int ext2_readdir (struct inode * inode, struct file * filp,
struct dirent * dirent, int count)
{
unsigned long offset, blk;
int i, num;
struct buffer_head * bh, * tmp, * bha[16];
struct ext2_dir_entry * de;
struct super_block * sb;
int err;
if (!inode || !S_ISDIR(inode->i_mode))
return -EBADF;
sb = inode->i_sb;
while (filp->f_pos < inode->i_size) {
offset = filp->f_pos & (sb->s_blocksize - 1);
blk = (filp->f_pos) >> EXT2_BLOCK_SIZE_BITS(sb);
bh = ext2_bread (inode, blk, 0, &err);
if (!bh) {
filp->f_pos += sb->s_blocksize - offset;
continue;
}
/*
* Do the readahead
*/
if (!offset) {
for (i = 16 >> (EXT2_BLOCK_SIZE_BITS(sb) - 9), num = 0;
i > 0; i--) {
tmp = ext2_getblk (inode, ++blk, 0, &err);
if (tmp && !tmp->b_uptodate && !tmp->b_lock)
bha[num++] = tmp;
else
brelse (tmp);
}
if (num) {
ll_rw_block (READA, num, bha);
for (i = 0; i < num; i++)
brelse (bha[i]);
}
}
de = (struct ext2_dir_entry *) (offset + bh->b_data);
while (offset < sb->s_blocksize && filp->f_pos < inode->i_size) {
if (!ext2_check_dir_entry ("ext2_readdir", inode, de,
bh, offset)) {
brelse (bh);
return 0;
}
offset += de->rec_len;
filp->f_pos += de->rec_len;
if (de->inode) {
memcpy_tofs (dirent->d_name, de->name,
de->name_len);
put_fs_long (de->inode, &dirent->d_ino);
put_fs_byte (0, de->name_len + dirent->d_name);
put_fs_word (de->name_len, &dirent->d_reclen);
dcache_add(inode, de->name, de->name_len,
de->inode);
i = de->name_len;
brelse (bh);
if (!IS_RDONLY(inode)) {
inode->i_atime = CURRENT_TIME;
inode->i_dirt = 1;
}
return i;
}
de = (struct ext2_dir_entry *) ((char *) de +
de->rec_len);
}
brelse (bh);
}
if (!IS_RDONLY(inode)) {
inode->i_atime = CURRENT_TIME;
inode->i_dirt = 1;
}
return 0;
}
errcode_t ext2fs_write_inode_full(ext2_filsys fs, ext2_ino_t ino,
struct ext2_inode * inode, int bufsize)
{
blk64_t block_nr;
unsigned long group, block, offset;
errcode_t retval = 0;
struct ext2_inode_large *w_inode;
char *ptr;
unsigned i;
int clen;
int length = EXT2_INODE_SIZE(fs->super);
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
/* Check to see if user provided an override function */
if (fs->write_inode) {
retval = (fs->write_inode)(fs, ino, inode);
if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
return retval;
}
if ((ino == 0) || (ino > fs->super->s_inodes_count))
return EXT2_ET_BAD_INODE_NUM;
/* Prepare our shadow buffer for read/modify/byteswap/write */
retval = ext2fs_get_mem(length, &w_inode);
if (retval)
return retval;
if (bufsize < length) {
int old_flags = fs->flags;
fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
retval = ext2fs_read_inode_full(fs, ino,
(struct ext2_inode *)w_inode,
length);
fs->flags = (old_flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) |
(fs->flags & ~EXT2_FLAG_IGNORE_CSUM_ERRORS);
if (retval)
goto errout;
}
/* Check to see if the inode cache needs to be updated */
if (fs->icache) {
for (i=0; i < fs->icache->cache_size; i++) {
if (fs->icache->cache[i].ino == ino) {
memcpy(fs->icache->cache[i].inode, inode,
(bufsize > length) ? length : bufsize);
break;
}
}
} else {
retval = ext2fs_create_inode_cache(fs, 4);
if (retval)
goto errout;
}
memcpy(w_inode, inode, (bufsize > length) ? length : bufsize);
if (!(fs->flags & EXT2_FLAG_RW)) {
retval = EXT2_ET_RO_FILSYS;
goto errout;
}
#ifdef WORDS_BIGENDIAN
ext2fs_swap_inode_full(fs, w_inode, w_inode, 1, length);
#endif
retval = ext2fs_inode_csum_set(fs, ino, w_inode);
if (retval)
goto errout;
group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) *
EXT2_INODE_SIZE(fs->super);
block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super);
if (!ext2fs_inode_table_loc(fs, (unsigned) group)) {
retval = EXT2_ET_MISSING_INODE_TABLE;
goto errout;
}
block_nr = ext2fs_inode_table_loc(fs, (unsigned) group) + block;
offset &= (EXT2_BLOCK_SIZE(fs->super) - 1);
ptr = (char *) w_inode;
while (length) {
clen = length;
if ((offset + length) > fs->blocksize)
clen = fs->blocksize - offset;
if (fs->icache->buffer_blk != block_nr) {
retval = io_channel_read_blk64(fs->io, block_nr, 1,
fs->icache->buffer);
if (retval)
goto errout;
fs->icache->buffer_blk = block_nr;
}
memcpy((char *) fs->icache->buffer + (unsigned) offset,
ptr, clen);
retval = io_channel_write_blk64(fs->io, block_nr, 1,
fs->icache->buffer);
if (retval)
goto errout;
offset = 0;
ptr += clen;
length -= clen;
block_nr++;
}
fs->flags |= EXT2_FLAG_CHANGED;
errout:
ext2fs_free_mem(&w_inode);
return retval;
}
/*
* Functions to read and write a single inode.
*/
errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino,
struct ext2_inode * inode, int bufsize)
{
blk64_t block_nr;
unsigned long group, block, offset;
char *ptr;
errcode_t retval;
unsigned i;
int clen, inodes_per_block;
io_channel io;
int length = EXT2_INODE_SIZE(fs->super);
struct ext2_inode_large *iptr;
int cache_slot, fail_csum;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
/* Check to see if user has an override function */
if (fs->read_inode &&
((bufsize == sizeof(struct ext2_inode)) ||
(EXT2_INODE_SIZE(fs->super) == sizeof(struct ext2_inode)))) {
retval = (fs->read_inode)(fs, ino, inode);
if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
return retval;
}
if ((ino == 0) || (ino > fs->super->s_inodes_count))
return EXT2_ET_BAD_INODE_NUM;
/* Create inode cache if not present */
if (!fs->icache) {
retval = ext2fs_create_inode_cache(fs, 4);
if (retval)
return retval;
}
/* Check to see if it's in the inode cache */
for (i = 0; i < fs->icache->cache_size; i++) {
if (fs->icache->cache[i].ino == ino) {
memcpy(inode, fs->icache->cache[i].inode,
(bufsize > length) ? length : bufsize);
return 0;
}
}
if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
inodes_per_block = fs->blocksize / EXT2_INODE_SIZE(fs->super);
block_nr = fs->image_header->offset_inode / fs->blocksize;
block_nr += (ino - 1) / inodes_per_block;
offset = ((ino - 1) % inodes_per_block) *
EXT2_INODE_SIZE(fs->super);
io = fs->image_io;
} else {
group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
if (group > fs->group_desc_count)
return EXT2_ET_BAD_INODE_NUM;
offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) *
EXT2_INODE_SIZE(fs->super);
block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super);
if (!ext2fs_inode_table_loc(fs, (unsigned) group))
return EXT2_ET_MISSING_INODE_TABLE;
block_nr = ext2fs_inode_table_loc(fs, group) +
block;
io = fs->io;
}
offset &= (EXT2_BLOCK_SIZE(fs->super) - 1);
cache_slot = (fs->icache->cache_last + 1) % fs->icache->cache_size;
iptr = (struct ext2_inode_large *)fs->icache->cache[cache_slot].inode;
ptr = (char *) iptr;
while (length) {
clen = length;
if ((offset + length) > fs->blocksize)
clen = fs->blocksize - offset;
if (block_nr != fs->icache->buffer_blk) {
retval = io_channel_read_blk64(io, block_nr, 1,
fs->icache->buffer);
if (retval)
return retval;
fs->icache->buffer_blk = block_nr;
}
memcpy(ptr, ((char *) fs->icache->buffer) + (unsigned) offset,
clen);
offset = 0;
length -= clen;
ptr += clen;
block_nr++;
}
length = EXT2_INODE_SIZE(fs->super);
/* Verify the inode checksum. */
fail_csum = !ext2fs_inode_csum_verify(fs, ino, iptr);
#ifdef WORDS_BIGENDIAN
ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) iptr,
(struct ext2_inode_large *) iptr,
0, length);
#endif
/* Update the inode cache bookkeeping */
if (!fail_csum) {
fs->icache->cache_last = cache_slot;
fs->icache->cache[cache_slot].ino = ino;
}
memcpy(inode, iptr, (bufsize > length) ? length : bufsize);
if (!(fs->flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) && fail_csum)
return EXT2_ET_INODE_CSUM_INVALID;
return 0;
}
static int ext2_readdir(struct file * filp,
void * dirent, filldir_t filldir)
{
int error = 0;
unsigned long offset, blk;
int i, num, stored;
struct buffer_head * bh, * tmp, * bha[16];
struct ext2_dir_entry_2 * de;
struct super_block * sb;
int err;
struct inode *inode = filp->f_dentry->d_inode;
if (!inode || !S_ISDIR(inode->i_mode))
return -EBADF;
sb = inode->i_sb;
stored = 0;
bh = NULL;
offset = filp->f_pos & (sb->s_blocksize - 1);
while (!error && !stored && filp->f_pos < inode->i_size) {
blk = (filp->f_pos) >> EXT2_BLOCK_SIZE_BITS(sb);
bh = ext2_bread (inode, blk, 0, &err);
if (!bh) {
ext2_error (sb, "ext2_readdir",
"directory #%lu contains a hole at offset %lu",
inode->i_ino, (unsigned long)filp->f_pos);
filp->f_pos += sb->s_blocksize - offset;
continue;
}
/*
* Do the readahead
*/
if (!offset) {
for (i = 16 >> (EXT2_BLOCK_SIZE_BITS(sb) - 9), num = 0;
i > 0; i--) {
tmp = ext2_getblk (inode, ++blk, 0, &err);
if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
bha[num++] = tmp;
else
brelse (tmp);
}
if (num) {
ll_rw_block (READA, num, bha);
for (i = 0; i < num; i++)
brelse (bha[i]);
}
}
revalidate:
/* If the dir block has changed since the last call to
* readdir(2), then we might be pointing to an invalid
* dirent right now. Scan from the start of the block
* to make sure. */
if (filp->f_version != inode->i_version) {
for (i = 0; i < sb->s_blocksize && i < offset; ) {
de = (struct ext2_dir_entry_2 *)
(bh->b_data + i);
/* It's too expensive to do a full
* dirent test each time round this
* loop, but we do have to test at
* least that it is non-zero. A
* failure will be detected in the
* dirent test below. */
if (le16_to_cpu(de->rec_len) < EXT2_DIR_REC_LEN(1))
break;
i += le16_to_cpu(de->rec_len);
}
offset = i;
filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1))
| offset;
filp->f_version = inode->i_version;
}
while (!error && filp->f_pos < inode->i_size
&& offset < sb->s_blocksize) {
de = (struct ext2_dir_entry_2 *) (bh->b_data + offset);
if (!ext2_check_dir_entry ("ext2_readdir", inode, de,
bh, offset)) {
/* On error, skip the f_pos to the
next block. */
filp->f_pos = (filp->f_pos & (sb->s_blocksize - 1))
+ sb->s_blocksize;
brelse (bh);
return stored;
}
offset += le16_to_cpu(de->rec_len);
if (le32_to_cpu(de->inode)) {
/* We might block in the next section
* if the data destination is
* currently swapped out. So, use a
* version stamp to detect whether or
* not the directory has been modified
* during the copy operation.
*/
unsigned long version = inode->i_version;
error = filldir(dirent, de->name,
de->name_len,
filp->f_pos, le32_to_cpu(de->inode));
if (error)
break;
if (version != inode->i_version)
goto revalidate;
stored ++;
}
filp->f_pos += le16_to_cpu(de->rec_len);
}
offset = 0;
brelse (bh);
}
UPDATE_ATIME(inode);
return 0;
}
errcode_t ext2fs_write_inode_full(ext2_filsys fs, ext2_ino_t ino,
struct ext2_inode * inode, int bufsize)
{
blk64_t block_nr;
unsigned long group, block, offset;
errcode_t retval = 0;
struct ext2_inode_large temp_inode, *w_inode;
char *ptr;
int clen, i, length;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
/* Check to see if user provided an override function */
if (fs->write_inode) {
retval = (fs->write_inode)(fs, ino, inode);
if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
return retval;
}
/* Check to see if the inode cache needs to be updated */
if (fs->icache) {
for (i=0; i < fs->icache->cache_size; i++) {
if (fs->icache->cache[i].ino == ino) {
fs->icache->cache[i].inode = *inode;
break;
}
}
} else {
retval = create_icache(fs);
if (retval)
return retval;
}
if (!(fs->flags & EXT2_FLAG_RW))
return EXT2_ET_RO_FILSYS;
if ((ino == 0) || (ino > fs->super->s_inodes_count))
return EXT2_ET_BAD_INODE_NUM;
length = bufsize;
if (length < EXT2_INODE_SIZE(fs->super))
length = EXT2_INODE_SIZE(fs->super);
if (length > (int) sizeof(struct ext2_inode_large)) {
w_inode = malloc(length);
if (!w_inode) {
retval = ENOMEM;
goto errout;
}
} else
w_inode = &temp_inode;
memset(w_inode, 0, length);
#ifdef WORDS_BIGENDIAN
ext2fs_swap_inode_full(fs, w_inode,
(struct ext2_inode_large *) inode,
1, bufsize);
#else
memcpy(w_inode, inode, bufsize);
#endif
group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) *
EXT2_INODE_SIZE(fs->super);
block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super);
if (!ext2fs_inode_table_loc(fs, (unsigned) group)) {
retval = EXT2_ET_MISSING_INODE_TABLE;
goto errout;
}
block_nr = ext2fs_inode_table_loc(fs, (unsigned) group) + block;
offset &= (EXT2_BLOCK_SIZE(fs->super) - 1);
length = EXT2_INODE_SIZE(fs->super);
if (length > bufsize)
length = bufsize;
ptr = (char *) w_inode;
while (length) {
clen = length;
if ((offset + length) > fs->blocksize)
clen = fs->blocksize - offset;
if (fs->icache->buffer_blk != block_nr) {
retval = io_channel_read_blk64(fs->io, block_nr, 1,
fs->icache->buffer);
if (retval)
goto errout;
fs->icache->buffer_blk = block_nr;
}
memcpy((char *) fs->icache->buffer + (unsigned) offset,
ptr, clen);
retval = io_channel_write_blk64(fs->io, block_nr, 1,
fs->icache->buffer);
if (retval)
goto errout;
offset = 0;
ptr += clen;
length -= clen;
block_nr++;
}
fs->flags |= EXT2_FLAG_CHANGED;
errout:
if (w_inode && w_inode != &temp_inode)
free(w_inode);
return retval;
}
/*
* Functions to read and write a single inode.
*/
errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino,
struct ext2_inode * inode, int bufsize)
{
blk64_t block_nr;
unsigned long group, block, offset;
char *ptr;
errcode_t retval;
int clen, i, inodes_per_block, length;
io_channel io;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
/* Check to see if user has an override function */
if (fs->read_inode &&
((bufsize == sizeof(struct ext2_inode)) ||
(EXT2_INODE_SIZE(fs->super) == sizeof(struct ext2_inode)))) {
retval = (fs->read_inode)(fs, ino, inode);
if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
return retval;
}
if ((ino == 0) || (ino > fs->super->s_inodes_count))
return EXT2_ET_BAD_INODE_NUM;
/* Create inode cache if not present */
if (!fs->icache) {
retval = create_icache(fs);
if (retval)
return retval;
}
/* Check to see if it's in the inode cache */
if (bufsize == sizeof(struct ext2_inode)) {
/* only old good inode can be retrieved from the cache */
for (i=0; i < fs->icache->cache_size; i++) {
if (fs->icache->cache[i].ino == ino) {
*inode = fs->icache->cache[i].inode;
return 0;
}
}
}
if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
inodes_per_block = fs->blocksize / EXT2_INODE_SIZE(fs->super);
block_nr = fs->image_header->offset_inode / fs->blocksize;
block_nr += (ino - 1) / inodes_per_block;
offset = ((ino - 1) % inodes_per_block) *
EXT2_INODE_SIZE(fs->super);
io = fs->image_io;
} else {
group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
if (group > fs->group_desc_count)
return EXT2_ET_BAD_INODE_NUM;
offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) *
EXT2_INODE_SIZE(fs->super);
block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super);
if (!ext2fs_inode_table_loc(fs, (unsigned) group))
return EXT2_ET_MISSING_INODE_TABLE;
block_nr = ext2fs_inode_table_loc(fs, group) +
block;
io = fs->io;
}
offset &= (EXT2_BLOCK_SIZE(fs->super) - 1);
length = EXT2_INODE_SIZE(fs->super);
if (bufsize < length)
length = bufsize;
ptr = (char *) inode;
while (length) {
clen = length;
if ((offset + length) > fs->blocksize)
clen = fs->blocksize - offset;
if (block_nr != fs->icache->buffer_blk) {
retval = io_channel_read_blk64(io, block_nr, 1,
fs->icache->buffer);
if (retval)
return retval;
fs->icache->buffer_blk = block_nr;
}
memcpy(ptr, ((char *) fs->icache->buffer) + (unsigned) offset,
clen);
offset = 0;
length -= clen;
ptr += clen;
block_nr++;
}
#ifdef WORDS_BIGENDIAN
ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) inode,
(struct ext2_inode_large *) inode,
0, bufsize);
#endif
/* Update the inode cache */
fs->icache->cache_last = (fs->icache->cache_last + 1) %
fs->icache->cache_size;
fs->icache->cache[fs->icache->cache_last].ino = ino;
fs->icache->cache[fs->icache->cache_last].inode = *inode;
return 0;
}
extern errcode_t ext2fs_extent_open2(ext2_filsys fs, ext2_ino_t ino,
struct ext2_inode *inode,
ext2_extent_handle_t *ret_handle)
{
struct ext2_extent_handle *handle;
errcode_t retval;
int i;
struct ext3_extent_header *eh;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
if (!inode)
if ((ino == 0) || (ino > fs->super->s_inodes_count))
return EXT2_ET_BAD_INODE_NUM;
retval = ext2fs_get_mem(sizeof(struct ext2_extent_handle), &handle);
if (retval)
return retval;
memset(handle, 0, sizeof(struct ext2_extent_handle));
handle->ino = ino;
handle->fs = fs;
if (inode) {
handle->inode = inode;
} else {
handle->inode = &handle->inodebuf;
retval = ext2fs_read_inode(fs, ino, handle->inode);
if (retval)
goto errout;
}
eh = (struct ext3_extent_header *) &handle->inode->i_block[0];
for (i=0; i < EXT2_N_BLOCKS; i++)
if (handle->inode->i_block[i])
break;
if (i >= EXT2_N_BLOCKS) {
eh->eh_magic = ext2fs_cpu_to_le16(EXT3_EXT_MAGIC);
eh->eh_depth = 0;
eh->eh_entries = 0;
i = (sizeof(handle->inode->i_block) - sizeof(*eh)) /
sizeof(struct ext3_extent);
eh->eh_max = ext2fs_cpu_to_le16(i);
handle->inode->i_flags |= EXT4_EXTENTS_FL;
}
if (!(handle->inode->i_flags & EXT4_EXTENTS_FL)) {
retval = EXT2_ET_INODE_NOT_EXTENT;
goto errout;
}
retval = ext2fs_extent_header_verify(eh, sizeof(handle->inode->i_block));
if (retval)
goto errout;
handle->max_depth = ext2fs_le16_to_cpu(eh->eh_depth);
handle->type = ext2fs_le16_to_cpu(eh->eh_magic);
retval = ext2fs_get_mem(((handle->max_depth+1) *
sizeof(struct extent_path)),
&handle->path);
memset(handle->path, 0,
(handle->max_depth+1) * sizeof(struct extent_path));
handle->path[0].buf = (char *) handle->inode->i_block;
handle->path[0].left = handle->path[0].entries =
ext2fs_le16_to_cpu(eh->eh_entries);
handle->path[0].max_entries = ext2fs_le16_to_cpu(eh->eh_max);
handle->path[0].curr = 0;
handle->path[0].end_blk =
(EXT2_I_SIZE(handle->inode) + fs->blocksize - 1) >>
EXT2_BLOCK_SIZE_BITS(fs->super);
handle->path[0].visit_num = 1;
handle->level = 0;
handle->magic = EXT2_ET_MAGIC_EXTENT_HANDLE;
*ret_handle = handle;
return 0;
errout:
ext2fs_extent_free(handle);
return retval;
}
static int ext2_readdir (struct inode * inode, struct file * filp,
struct dirent * dirent, int count)
{
unsigned long offset, blk;
int i, num, stored, dlen;
struct buffer_head * bh, * tmp, * bha[16];
struct ext2_dir_entry * de;
struct super_block * sb;
int err, version;
if (!inode || !S_ISDIR(inode->i_mode))
return -EBADF;
sb = inode->i_sb;
stored = 0;
bh = NULL;
offset = filp->f_pos & (sb->s_blocksize - 1);
while (count > 0 && !stored && filp->f_pos < inode->i_size) {
blk = (filp->f_pos) >> EXT2_BLOCK_SIZE_BITS(sb);
bh = ext2_bread (inode, blk, 0, &err);
if (!bh) {
filp->f_pos += sb->s_blocksize - offset;
continue;
}
/*
* Do the readahead
*/
if (!offset) {
for (i = 16 >> (EXT2_BLOCK_SIZE_BITS(sb) - 9), num = 0;
i > 0; i--) {
tmp = ext2_getblk (inode, ++blk, 0, &err);
if (tmp && !tmp->b_uptodate && !tmp->b_lock)
bha[num++] = tmp;
else
brelse (tmp);
}
if (num) {
ll_rw_block (READA, num, bha);
for (i = 0; i < num; i++)
brelse (bha[i]);
}
}
revalidate:
/* If the dir block has changed since the last call to
* readdir(2), then we might be pointing to an invalid
* dirent right now. Scan from the start of the block
* to make sure. */
if (filp->f_version != inode->i_version) {
for (i = 0; i < sb->s_blocksize && i < offset; ) {
de = (struct ext2_dir_entry *)
(bh->b_data + i);
/* It's too expensive to do a full
* dirent test each time round this
* loop, but we do have to test at
* least that it is non-zero. A
* failure will be detected in the
* dirent test below. */
if (de->rec_len < EXT2_DIR_REC_LEN(1))
break;
i += de->rec_len;
}
offset = i;
filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1))
| offset;
filp->f_version = inode->i_version;
}
while (count > 0 && filp->f_pos < inode->i_size
&& offset < sb->s_blocksize) {
de = (struct ext2_dir_entry *) (bh->b_data + offset);
if (!ext2_check_dir_entry ("ext2_readdir", inode, de,
bh, offset)) {
/* On error, skip the f_pos to the
next block. */
filp->f_pos = (filp->f_pos & (sb->s_blocksize - 1))
+ sb->s_blocksize;
brelse (bh);
return stored;
}
if (de->inode) {
dlen = ROUND_UP(NAME_OFFSET(dirent)
+ de->name_len + 1);
/* Old libc libraries always use a
count of 1. */
if (count == 1 && !stored)
count = dlen;
if (count < dlen) {
count = 0;
break;
}
/* We might block in the next section
* if the data destination is
* currently swapped out. So, use a
* version stamp to detect whether or
* not the directory has been modified
* during the copy operation. */
version = inode->i_version;
i = de->name_len;
memcpy_tofs (dirent->d_name, de->name, i);
put_fs_long (de->inode, &dirent->d_ino);
put_fs_byte (0, dirent->d_name + i);
put_fs_word (i, &dirent->d_reclen);
put_fs_long (dlen, &dirent->d_off);
if (version != inode->i_version)
goto revalidate;
dcache_add(inode, de->name, de->name_len,
de->inode);
stored += dlen;
count -= dlen;
((char *) dirent) += dlen;
}
offset += de->rec_len;
filp->f_pos += de->rec_len;
}
offset = 0;
brelse (bh);
}
if (!IS_RDONLY(inode)) {
inode->i_atime = CURRENT_TIME;
inode->i_dirt = 1;
}
return stored;
}
struct super_block * ext2_read_super (struct super_block * sb, void * data,
int silent)
{
struct buffer_head * bh;
struct ext2_super_block * es;
unsigned long sb_block = 1;
unsigned long logic_sb_block = 1;
int dev = sb->s_dev;
int bh_count;
int i, j;
#ifdef EXT2FS_PRE_02B_COMPAT
int fs_converted = 0;
#endif
set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
if (!parse_options ((char *) data, &sb_block,
&sb->u.ext2_sb.s_mount_opt)) {
sb->s_dev = 0;
return NULL;
}
lock_super (sb);
set_blocksize (dev, BLOCK_SIZE);
if (!(bh = bread (dev, sb_block, BLOCK_SIZE))) {
sb->s_dev = 0;
unlock_super (sb);
printk ("EXT2-fs: unable to read superblock\n");
return NULL;
}
/*
* Note: s_es must be initialized s_es as soon as possible because
* some ext2 macro-instructions depend on its value
*/
es = (struct ext2_super_block *) bh->b_data;
sb->u.ext2_sb.s_es = es;
sb->s_magic = es->s_magic;
if (sb->s_magic != EXT2_SUPER_MAGIC
#ifdef EXT2FS_PRE_02B_COMPAT
&& sb->s_magic != EXT2_PRE_02B_MAGIC
#endif
) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
if (!silent)
printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
MAJOR(dev), MINOR(dev));
return NULL;
}
sb->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
sb->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(sb);
if (sb->s_blocksize != BLOCK_SIZE &&
(sb->s_blocksize == 1024 || sb->s_blocksize == 2048 ||
sb->s_blocksize == 4096)) {
unsigned long offset;
brelse (bh);
set_blocksize (dev, sb->s_blocksize);
logic_sb_block = sb_block / sb->s_blocksize;
offset = sb_block % sb->s_blocksize;
bh = bread (dev, logic_sb_block, sb->s_blocksize);
if(!bh)
return NULL;
es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
sb->u.ext2_sb.s_es = es;
if (es->s_magic != EXT2_SUPER_MAGIC) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: Magic mismatch, very weird !\n");
return NULL;
}
}
sb->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
es->s_log_frag_size;
if (sb->u.ext2_sb.s_frag_size)
sb->u.ext2_sb.s_frags_per_block = sb->s_blocksize /
sb->u.ext2_sb.s_frag_size;
else
sb->s_magic = 0;
sb->u.ext2_sb.s_blocks_per_group = es->s_blocks_per_group;
sb->u.ext2_sb.s_frags_per_group = es->s_frags_per_group;
sb->u.ext2_sb.s_inodes_per_group = es->s_inodes_per_group;
sb->u.ext2_sb.s_inodes_per_block = sb->s_blocksize /
sizeof (struct ext2_inode);
sb->u.ext2_sb.s_itb_per_group = sb->u.ext2_sb.s_inodes_per_group /
sb->u.ext2_sb.s_inodes_per_block;
sb->u.ext2_sb.s_desc_per_block = sb->s_blocksize /
sizeof (struct ext2_group_desc);
sb->u.ext2_sb.s_sbh = bh;
sb->u.ext2_sb.s_es = es;
sb->u.ext2_sb.s_mount_state = es->s_state;
sb->u.ext2_sb.s_rename_lock = 0;
sb->u.ext2_sb.s_rename_wait = NULL;
#ifdef EXT2FS_PRE_02B_COMPAT
if (sb->s_magic == EXT2_PRE_02B_MAGIC) {
if (es->s_blocks_count > 262144) {
/*
* fs > 256 MB can't be converted
*/
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: trying to mount a pre-0.2b file"
"system which cannot be converted\n");
return NULL;
}
printk ("EXT2-fs: mounting a pre 0.2b file system, "
"will try to convert the structure\n");
if (!(sb->s_flags & MS_RDONLY)) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: cannot convert a read-only fs\n");
return NULL;
}
if (!convert_pre_02b_fs (sb, bh)) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: conversion failed !!!\n");
return NULL;
}
printk ("EXT2-fs: conversion succeeded !!!\n");
fs_converted = 1;
}
#endif
if (sb->s_magic != EXT2_SUPER_MAGIC) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
if (!silent)
printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
MAJOR(dev), MINOR(dev));
return NULL;
}
if (sb->s_blocksize != bh->b_size) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
if (!silent)
printk ("VFS: Unsupported blocksize on dev 0x%04x.\n",
dev);
return NULL;
}
if (sb->s_blocksize != sb->u.ext2_sb.s_frag_size) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
sb->u.ext2_sb.s_frag_size, sb->s_blocksize);
return NULL;
}
sb->u.ext2_sb.s_groups_count = (es->s_blocks_count -
es->s_first_data_block +
EXT2_BLOCKS_PER_GROUP(sb) - 1) /
EXT2_BLOCKS_PER_GROUP(sb);
for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
sb->u.ext2_sb.s_group_desc[i] = NULL;
bh_count = (sb->u.ext2_sb.s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
EXT2_DESC_PER_BLOCK(sb);
if (bh_count > EXT2_MAX_GROUP_DESC) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: file system is too big\n");
return NULL;
}
for (i = 0; i < bh_count; i++) {
sb->u.ext2_sb.s_group_desc[i] = bread (dev, logic_sb_block + i + 1,
sb->s_blocksize);
if (!sb->u.ext2_sb.s_group_desc[i]) {
sb->s_dev = 0;
unlock_super (sb);
for (j = 0; j < i; j++)
brelse (sb->u.ext2_sb.s_group_desc[j]);
brelse (bh);
printk ("EXT2-fs: unable to read group descriptors\n");
return NULL;
}
}
if (!ext2_check_descriptors (sb)) {
sb->s_dev = 0;
unlock_super (sb);
for (j = 0; j < i; j++)
brelse (sb->u.ext2_sb.s_group_desc[j]);
brelse (bh);
printk ("EXT2-fs: group descriptors corrupted !\n");
return NULL;
}
for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
sb->u.ext2_sb.s_inode_bitmap_number[i] = 0;
sb->u.ext2_sb.s_inode_bitmap[i] = NULL;
sb->u.ext2_sb.s_block_bitmap_number[i] = 0;
sb->u.ext2_sb.s_block_bitmap[i] = NULL;
}
sb->u.ext2_sb.s_loaded_inode_bitmaps = 0;
sb->u.ext2_sb.s_loaded_block_bitmaps = 0;
unlock_super (sb);
/*
* set up enough so that it can read an inode
*/
sb->s_dev = dev;
sb->s_op = &ext2_sops;
if (!(sb->s_mounted = iget (sb, EXT2_ROOT_INO))) {
sb->s_dev = 0;
for (i = 0; i < EXT2_MAX_GROUP_DESC; i++)
if (sb->u.ext2_sb.s_group_desc[i])
brelse (sb->u.ext2_sb.s_group_desc[i]);
brelse (bh);
printk ("EXT2-fs: get root inode failed\n");
return NULL;
}
#ifdef EXT2FS_PRE_02B_COMPAT
if (fs_converted) {
for (i = 0; i < bh_count; i++)
sb->u.ext2_sb.s_group_desc[i]->b_dirt = 1;
sb->s_dirt = 1;
}
#endif
ext2_setup_super (sb, es);
return sb;
}
struct super_block * ext2_read_super (struct super_block * sb, void * data,
int silent)
{
struct buffer_head * bh;
struct ext2_super_block * es;
unsigned long sb_block = 1;
unsigned short resuid = EXT2_DEF_RESUID;
unsigned short resgid = EXT2_DEF_RESGID;
unsigned long logic_sb_block = 1;
int dev = sb->s_dev;
int db_count;
int i, j;
#ifdef EXT2FS_PRE_02B_COMPAT
int fs_converted = 0;
#endif
#ifndef OS2
set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
#else
set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_STRICT);
#endif
if (!parse_options ((char *) data, &sb_block, &resuid, &resgid,
&sb->u.ext2_sb.s_mount_opt)) {
sb->s_dev = 0;
return NULL;
}
lock_super (sb);
set_blocksize (dev, BLOCK_SIZE);
if (!(bh = bread (dev, sb_block, BLOCK_SIZE))) {
sb->s_dev = 0;
unlock_super (sb);
printk ("EXT2-fs: unable to read superblock\n");
return NULL;
}
/*
* Note: s_es must be initialized s_es as soon as possible because
* some ext2 macro-instructions depend on its value
*/
es = (struct ext2_super_block *) bh->b_data;
sb->u.ext2_sb.s_es = es;
sb->s_magic = es->s_magic;
if (sb->s_magic != EXT2_SUPER_MAGIC
#ifdef EXT2FS_PRE_02B_COMPAT
&& sb->s_magic != EXT2_PRE_02B_MAGIC
#endif
) {
if (!silent)
printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
MAJOR(dev), MINOR(dev));
failed_mount:
sb->s_dev = 0;
unlock_super (sb);
if (bh)
brelse (bh);
return NULL;
}
#ifdef EXT2_DYNAMIC_REV
if (es->s_rev_level > EXT2_GOOD_OLD_REV) {
if (es->s_feature_incompat & ~EXT2_FEATURE_INCOMPAT_SUPP) {
#ifndef OS2
printk("EXT2-fs: %s: couldn't mount because of "
"unsupported optional features.\n",
kdevname(dev));
#else
printk("EXT2-fs (drive %c:) couldn't mount because of "
"unsupported optional features.\n",
sb->s_drive + 'A');
#endif
goto failed_mount;
}
if (!(sb->s_flags & MS_RDONLY) &&
(es->s_feature_ro_compat & ~EXT2_FEATURE_RO_COMPAT_SUPP)) {
#ifndef OS2
printk("EXT2-fs: %s: couldn't mount RDWR because of "
"unsupported optional features.\n",
kdevname(dev));
#else
printk("EXT2-fs (drive %c:) couldn't mount RDWR because of "
"unsupported optional features.\n",
sb->s_drive + 'A');
#endif
goto failed_mount;
}
}
#endif
sb->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
sb->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(sb);
if (sb->s_blocksize != BLOCK_SIZE &&
(sb->s_blocksize == 1024 || sb->s_blocksize == 2048 ||
sb->s_blocksize == 4096)) {
unsigned long offset;
brelse (bh);
set_blocksize (dev, sb->s_blocksize);
logic_sb_block = (sb_block*BLOCK_SIZE) / sb->s_blocksize;
offset = (sb_block*BLOCK_SIZE) % sb->s_blocksize;
bh = bread (dev, logic_sb_block, sb->s_blocksize);
if(!bh)
return NULL;
es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
sb->u.ext2_sb.s_es = es;
if (es->s_magic != EXT2_SUPER_MAGIC) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: Magic mismatch, very weird !\n");
return NULL;
}
}
#ifdef EXT2_DYNAMIC_REV
if (es->s_rev_level == EXT2_GOOD_OLD_REV) {
sb->u.ext2_sb.s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
sb->u.ext2_sb.s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
} else {
sb->u.ext2_sb.s_inode_size = es->s_inode_size;
sb->u.ext2_sb.s_first_ino = es->s_first_ino;
if (sb->u.ext2_sb.s_inode_size != EXT2_GOOD_OLD_INODE_SIZE) {
printk ("EXT2-fs: unsupported inode size: %d\n",
sb->u.ext2_sb.s_inode_size);
goto failed_mount;
}
}
#endif
sb->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
es->s_log_frag_size;
if (sb->u.ext2_sb.s_frag_size)
sb->u.ext2_sb.s_frags_per_block = sb->s_blocksize /
sb->u.ext2_sb.s_frag_size;
else
sb->s_magic = 0;
sb->u.ext2_sb.s_blocks_per_group = es->s_blocks_per_group;
sb->u.ext2_sb.s_frags_per_group = es->s_frags_per_group;
sb->u.ext2_sb.s_inodes_per_group = es->s_inodes_per_group;
sb->u.ext2_sb.s_inodes_per_block = sb->s_blocksize /
sizeof (struct ext2_inode);
sb->u.ext2_sb.s_itb_per_group = sb->u.ext2_sb.s_inodes_per_group /
sb->u.ext2_sb.s_inodes_per_block;
sb->u.ext2_sb.s_desc_per_block = sb->s_blocksize /
sizeof (struct ext2_group_desc);
sb->u.ext2_sb.s_sbh = bh;
sb->u.ext2_sb.s_es = es;
if (resuid != EXT2_DEF_RESUID)
sb->u.ext2_sb.s_resuid = resuid;
else
sb->u.ext2_sb.s_resuid = es->s_def_resuid;
if (resgid != EXT2_DEF_RESGID)
sb->u.ext2_sb.s_resgid = resgid;
else
sb->u.ext2_sb.s_resgid = es->s_def_resgid;
sb->u.ext2_sb.s_mount_state = es->s_state;
sb->u.ext2_sb.s_rename_lock = 0;
#ifndef OS2
sb->u.ext2_sb.s_rename_wait = NULL;
#else
sb->u.ext2_sb.s_rename_wait = 0;
#endif
#ifdef EXT2FS_PRE_02B_COMPAT
if (sb->s_magic == EXT2_PRE_02B_MAGIC) {
if (es->s_blocks_count > 262144) {
/*
* fs > 256 MB can't be converted
*/
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: trying to mount a pre-0.2b file"
"system which cannot be converted\n");
return NULL;
}
printk ("EXT2-fs: mounting a pre 0.2b file system, "
"will try to convert the structure\n");
if (!(sb->s_flags & MS_RDONLY)) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: cannot convert a read-only fs\n");
return NULL;
}
if (!convert_pre_02b_fs (sb, bh)) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: conversion failed !!!\n");
return NULL;
}
printk ("EXT2-fs: conversion succeeded !!!\n");
fs_converted = 1;
}
#endif
if (sb->s_magic != EXT2_SUPER_MAGIC) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
if (!silent)
printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
MAJOR(dev), MINOR(dev));
return NULL;
}
if (sb->s_blocksize != bh->b_size) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
if (!silent)
printk ("VFS: Unsupported blocksize on dev 0x%04x.\n",
dev);
return NULL;
}
if (sb->s_blocksize != sb->u.ext2_sb.s_frag_size) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
sb->u.ext2_sb.s_frag_size, sb->s_blocksize);
return NULL;
}
sb->u.ext2_sb.s_groups_count = (es->s_blocks_count -
es->s_first_data_block +
EXT2_BLOCKS_PER_GROUP(sb) - 1) /
EXT2_BLOCKS_PER_GROUP(sb);
db_count = (sb->u.ext2_sb.s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
EXT2_DESC_PER_BLOCK(sb);
#ifndef OS2
sb->u.ext2_sb.s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
if (sb->u.ext2_sb.s_group_desc == NULL) {
#else
if (DevHlp32_VMAlloc(db_count * sizeof (struct buffer_head *), VMDHA_NOPHYSADDR, VMDHA_SWAP, (void **)(&(sb->u.ext2_sb.s_group_desc))) != NO_ERROR) {
#endif
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: not enough memory\n");
return NULL;
}
for (i = 0; i < db_count; i++) {
sb->u.ext2_sb.s_group_desc[i] = bread (dev, logic_sb_block + i + 1,
sb->s_blocksize);
if (!sb->u.ext2_sb.s_group_desc[i]) {
sb->s_dev = 0;
unlock_super (sb);
for (j = 0; j < i; j++)
brelse (sb->u.ext2_sb.s_group_desc[j]);
kfree_s (sb->u.ext2_sb.s_group_desc,
db_count * sizeof (struct buffer_head *));
brelse (bh);
printk ("EXT2-fs: unable to read group descriptors\n");
return NULL;
}
}
if (!ext2_check_descriptors (sb)) {
sb->s_dev = 0;
unlock_super (sb);
for (j = 0; j < db_count; j++)
brelse (sb->u.ext2_sb.s_group_desc[j]);
kfree_s (sb->u.ext2_sb.s_group_desc,
db_count * sizeof (struct buffer_head *));
brelse (bh);
printk ("EXT2-fs: group descriptors corrupted !\n");
return NULL;
}
for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
sb->u.ext2_sb.s_inode_bitmap_number[i] = 0;
sb->u.ext2_sb.s_inode_bitmap[i] = NULL;
sb->u.ext2_sb.s_block_bitmap_number[i] = 0;
sb->u.ext2_sb.s_block_bitmap[i] = NULL;
}
sb->u.ext2_sb.s_loaded_inode_bitmaps = 0;
sb->u.ext2_sb.s_loaded_block_bitmaps = 0;
sb->u.ext2_sb.s_db_per_group = db_count;
unlock_super (sb);
/*
* set up enough so that it can read an inode
*/
sb->s_dev = dev;
sb->s_op = &ext2_sops;
if (!(sb->s_mounted = iget (sb, EXT2_ROOT_INO))) {
sb->s_dev = 0;
for (i = 0; i < db_count; i++)
if (sb->u.ext2_sb.s_group_desc[i])
brelse (sb->u.ext2_sb.s_group_desc[i]);
kfree_s (sb->u.ext2_sb.s_group_desc,
db_count * sizeof (struct buffer_head *));
brelse (bh);
printk ("EXT2-fs: get root inode failed\n");
return NULL;
}
#ifdef EXT2FS_PRE_02B_COMPAT
if (fs_converted) {
for (i = 0; i < db_count; i++)
mark_buffer_dirty(sb->u.ext2_sb.s_group_desc[i], 1);
sb->s_dirt = 1;
}
#endif
ext2_setup_super (sb, es);
return sb;
}
static void ext2_commit_super (struct super_block * sb,
struct ext2_super_block * es)
{
es->s_wtime = CURRENT_TIME;
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
sb->s_dirt = 0;
}