static unsigned long
ext2_count_free_inodes(struct mount *mp)
{
#ifdef EXT2FS_DEBUG
struct ext2_sb_info *sb = VFSTOEXT2(mp)->um_e2fs;
struct ext2_super_block * es;
unsigned long desc_count, bitmap_count, x;
int bitmap_nr;
struct ext2_group_desc * gdp;
int i;
lock_super (VFSTOEXT2(mp)->um_devvp);
es = sb->s_es;
desc_count = 0;
bitmap_count = 0;
gdp = NULL;
for (i = 0; i < sb->s_groups_count; i++) {
gdp = get_group_desc (mp, i, NULL);
desc_count += gdp->bg_free_inodes_count;
bitmap_nr = load_inode_bitmap (mp, i);
x = ext2_count_free (sb->s_inode_bitmap[bitmap_nr],
EXT2_INODES_PER_GROUP(sb) / 8);
ext2_debug ("group %d: stored = %d, counted = %lu\n",
i, gdp->bg_free_inodes_count, x);
bitmap_count += x;
}
ext2_debug("stored = %lu, computed = %lu, %lu\n",
es->s_free_inodes_count, desc_count, bitmap_count);
unlock_super (VFSTOEXT2(mp)->um_devvp);
return desc_count;
#else
return VFSTOEXT2(mp)->um_e2fsb->s_free_inodes_count;
#endif
}
void
ext2_check_inodes_bitmap(struct mount *mp)
{
struct ext2_super_block * es;
unsigned long desc_count, bitmap_count, x;
int bitmap_nr;
struct ext2_group_desc * gdp;
int i;
lock_super (sb);
es = sb->u.ext2_sb.s_es;
desc_count = 0;
bitmap_count = 0;
gdp = NULL;
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
gdp = get_group_desc (sb, i, NULL);
desc_count += gdp->bg_free_inodes_count;
bitmap_nr = load_inode_bitmap (sb, i);
x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
EXT2_INODES_PER_GROUP(sb) / 8);
if (gdp->bg_free_inodes_count != x)
kprintf ( "ext2_check_inodes_bitmap:"
"Wrong free inodes count in group %d, "
"stored = %d, counted = %lu", i,
gdp->bg_free_inodes_count, x);
bitmap_count += x;
}
if (es->s_free_inodes_count != bitmap_count)
kprintf ( "ext2_check_inodes_bitmap:"
"Wrong free inodes count in super block, "
"stored = %lu, counted = %lu",
(unsigned long) es->s_free_inodes_count, bitmap_count);
unlock_super (sb);
}
static int read_inode_bitmap (struct super_block * sb,
unsigned long block_group,
unsigned int bitmap_nr)
{
struct ext2_group_desc * gdp;
struct buffer_head * bh;
int retval = 0;
int bs = BYTE_SWAP(sb->u.ext2_sb.s_byte_swapped);
gdp = get_group_desc (sb, block_group, NULL);
bh = bread (sb->s_dev, e_swab (bs, gdp->bg_inode_bitmap),
sb->s_blocksize);
if (!bh) {
ext2_error (sb, "read_inode_bitmap",
"Cannot read inode bitmap - "
"block_group = %lu, inode_bitmap = %lu",
block_group,
(unsigned long) e_swab (bs, gdp->bg_inode_bitmap));
retval = -EIO;
}
/*
* On IO error, just leave a zero in the superblock's block pointer for
* this group. The IO will be retried next time.
*/
sb->u.ext2_sb.s_inode_bitmap_number[bitmap_nr] = block_group;
sb->u.ext2_sb.s_inode_bitmap[bitmap_nr] = bh;
return retval;
}
void
ext2_free_inode(struct inode *inode)
{
struct ext2_sb_info *sb;
struct buf *bh;
struct buf *bh2;
unsigned long block_group;
unsigned long bit;
int bitmap_nr;
struct ext2_group_desc *gdp;
struct ext2_super_block *es;
if (!inode)
return;
if (inode->i_nlink) {
kprintf ("ext2_free_inode: inode has nlink=%d\n",
inode->i_nlink);
return;
}
ext2_debug ("freeing inode %lu\n", inode->i_number);
sb = inode->i_e2fs;
lock_super (DEVVP(inode));
if (inode->i_number < EXT2_FIRST_INO(sb) ||
inode->i_number > sb->s_es->s_inodes_count) {
kprintf ("free_inode reserved inode or nonexistent inode");
unlock_super (DEVVP(inode));
return;
}
es = sb->s_es;
block_group = (inode->i_number - 1) / EXT2_INODES_PER_GROUP(sb);
bit = (inode->i_number - 1) % EXT2_INODES_PER_GROUP(sb);
bitmap_nr = load_inode_bitmap (ITOV(inode)->v_mount, block_group);
bh = sb->s_inode_bitmap[bitmap_nr];
if (!clear_bit (bit, bh->b_data))
kprintf ( "ext2_free_inode:"
"bit already cleared for inode %lu",
(unsigned long)inode->i_number);
else {
gdp = get_group_desc (ITOV(inode)->v_mount, block_group, &bh2);
gdp->bg_free_inodes_count++;
if (S_ISDIR(inode->i_mode))
gdp->bg_used_dirs_count--;
mark_buffer_dirty(bh2);
es->s_free_inodes_count++;
}
mark_buffer_dirty(bh);
/*** XXX
if (sb->s_flags & MS_SYNCHRONOUS) {
ll_rw_block (WRITE, 1, &bh);
wait_on_buffer (bh);
}
***/
sb->s_dirt = 1;
unlock_super (DEVVP(inode));
}
static void
read_inode_bitmap(struct mount *mp, unsigned long block_group,
unsigned int bitmap_nr)
{
struct ext2_sb_info *sb = VFSTOEXT2(mp)->um_e2fs;
struct ext2_group_desc *gdp;
struct buf *bh;
int error;
gdp = get_group_desc (mp, block_group, NULL);
if ((error = bread (VFSTOEXT2(mp)->um_devvp,
fsbtodoff(sb, gdp->bg_inode_bitmap),
sb->s_blocksize, &bh)) != 0)
panic ( "read_inode_bitmap:"
"Cannot read inode bitmap - "
"block_group = %lu, inode_bitmap = %lu",
block_group, (unsigned long) gdp->bg_inode_bitmap);
sb->s_inode_bitmap_number[bitmap_nr] = block_group;
sb->s_inode_bitmap[bitmap_nr] = bh;
LCK_BUF(bh)
}
void ext2_check_inodes_bitmap (struct super_block * sb)
{
struct ext2_super_block * es;
unsigned long desc_count, bitmap_count, x;
int bitmap_nr;
struct ext2_group_desc * gdp;
int i, bs;
lock_super (sb);
bs = BYTE_SWAP(sb->u.ext2_sb.s_byte_swapped);
es = sb->u.ext2_sb.s_es;
desc_count = 0;
bitmap_count = 0;
gdp = NULL;
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
gdp = get_group_desc (sb, i, NULL);
desc_count += e_swab (bs, gdp->bg_free_inodes_count);
bitmap_nr = load_inode_bitmap (sb, i);
if (bitmap_nr < 0)
continue;
x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
EXT2_INODES_PER_GROUP(sb) / 8);
if (e_swab (bs, gdp->bg_free_inodes_count) != x)
ext2_error (sb, "ext2_check_inodes_bitmap",
"Wrong free inodes count in group %d, "
"stored = %d, counted = %lu", i,
e_swab (bs, gdp->bg_free_inodes_count), x);
bitmap_count += x;
}
if (e_swab (bs, es->s_free_inodes_count) != bitmap_count)
ext2_error (sb, "ext2_check_inodes_bitmap",
"Wrong free inodes count in super block, "
"stored = %lu, counted = %lu",
(unsigned long) e_swab (bs, es->s_free_inodes_count),
bitmap_count);
unlock_super (sb);
}
unsigned long ext2_count_free_inodes (struct super_block * sb)
{
#ifdef EXT2FS_DEBUG
struct ext2_super_block * es;
unsigned long desc_count, bitmap_count, x;
int bitmap_nr;
struct ext2_group_desc * gdp;
int i, bs;
lock_super (sb);
es = sb->u.ext2_sb.s_es;
bs = BYTE_SWAP(sb->u.ext2_sb.s_byte_swapped);
desc_count = 0;
bitmap_count = 0;
gdp = NULL;
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
gdp = get_group_desc (sb, i, NULL);
desc_count += e_swab (bs, gdp->bg_free_inodes_count);
bitmap_nr = load_inode_bitmap (sb, i);
if (bitmap_nr < 0)
continue;
x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
EXT2_INODES_PER_GROUP(sb) / 8);
printk ("group %d: stored = %d, counted = %lu\n",
i, e_swab (bs, gdp->bg_free_inodes_count), x);
bitmap_count += x;
}
printk("ext2_count_free_inodes: stored = %lu, computed = %lu, %lu\n",
e_swab (bs, es->s_free_inodes_count), desc_count, bitmap_count);
unlock_super (sb);
return desc_count;
#else
return e_swab (BYTE_SWAP(sb->u.ext2_sb.s_byte_swapped),
sb->u.ext2_sb.s_es->s_free_inodes_count);
#endif
}
/*
* this functino has been reduced to the actual 'find the inode number' part
*/
ino_t
ext2_new_inode(const struct inode *dir, int mode)
{
struct ext2_sb_info *sb;
struct buf *bh;
struct buf *bh2;
int i, j, avefreei;
int bitmap_nr;
struct ext2_group_desc *gdp;
struct ext2_group_desc *tmp;
struct ext2_super_block *es;
if (!dir)
return 0;
sb = dir->i_e2fs;
lock_super (DEVVP(dir));
es = sb->s_es;
repeat:
gdp = NULL; i=0;
if (S_ISDIR(mode)) {
avefreei = es->s_free_inodes_count /
sb->s_groups_count;
/* I am not yet convinced that this next bit is necessary.
i = dir->u.ext2_i.i_block_group;
for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
tmp = get_group_desc (sb, i, &bh2);
if ((tmp->bg_used_dirs_count << 8) <
tmp->bg_free_inodes_count) {
gdp = tmp;
break;
}
else
i = ++i % sb->u.ext2_sb.s_groups_count;
}
*/
if (!gdp) {
for (j = 0; j < sb->s_groups_count; j++) {
tmp = get_group_desc(ITOV(dir)->v_mount,j,&bh2);
if (tmp->bg_free_inodes_count &&
tmp->bg_free_inodes_count >= avefreei) {
if (!gdp ||
(tmp->bg_free_blocks_count >
gdp->bg_free_blocks_count)) {
i = j;
gdp = tmp;
}
}
}
}
}
else
{
/*
* Try to place the inode in its parent directory
*/
i = dir->i_block_group;
tmp = get_group_desc (ITOV(dir)->v_mount, i, &bh2);
if (tmp->bg_free_inodes_count)
gdp = tmp;
else
{
/*
* Use a quadratic hash to find a group with a
* free inode
*/
for (j = 1; j < sb->s_groups_count; j <<= 1) {
i += j;
if (i >= sb->s_groups_count)
i -= sb->s_groups_count;
tmp = get_group_desc(ITOV(dir)->v_mount,i,&bh2);
if (tmp->bg_free_inodes_count) {
gdp = tmp;
break;
}
}
}
if (!gdp) {
/*
* That failed: try linear search for a free inode
*/
i = dir->i_block_group + 1;
for (j = 2; j < sb->s_groups_count; j++) {
if (++i >= sb->s_groups_count)
i = 0;
tmp = get_group_desc(ITOV(dir)->v_mount,i,&bh2);
if (tmp->bg_free_inodes_count) {
gdp = tmp;
break;
}
}
}
}
if (!gdp) {
unlock_super (DEVVP(dir));
return 0;
}
bitmap_nr = load_inode_bitmap (ITOV(dir)->v_mount, i);
bh = sb->s_inode_bitmap[bitmap_nr];
if ((j = find_first_zero_bit ((unsigned long *) bh->b_data,
EXT2_INODES_PER_GROUP(sb))) <
EXT2_INODES_PER_GROUP(sb)) {
if (set_bit (j, bh->b_data)) {
kprintf ( "ext2_new_inode:"
"bit already set for inode %d", j);
goto repeat;
}
/* Linux now does the following:
mark_buffer_dirty(bh);
if (sb->s_flags & MS_SYNCHRONOUS) {
ll_rw_block (WRITE, 1, &bh);
wait_on_buffer (bh);
}
*/
mark_buffer_dirty(bh);
} else {
if (gdp->bg_free_inodes_count != 0) {
kprintf ( "ext2_new_inode:"
"Free inodes count corrupted in group %d",
i);
unlock_super (DEVVP(dir));
return 0;
}
goto repeat;
}
j += i * EXT2_INODES_PER_GROUP(sb) + 1;
if (j < EXT2_FIRST_INO(sb) || j > es->s_inodes_count) {
kprintf ( "ext2_new_inode:"
"reserved inode or inode > inodes count - "
"block_group = %d,inode=%d", i, j);
unlock_super (DEVVP(dir));
return 0;
}
gdp->bg_free_inodes_count--;
if (S_ISDIR(mode))
gdp->bg_used_dirs_count++;
mark_buffer_dirty(bh2);
es->s_free_inodes_count--;
/* mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1); */
sb->s_dirt = 1;
unlock_super (DEVVP(dir));
return j;
}
/*
* There are two policies for allocating an inode. If the new inode is
* a directory, then a forward search is made for a block group with both
* free space and a low directory-to-inode ratio; if that fails, then of
* the groups with above-average free space, that group with the fewest
* directories already is chosen.
*
* For other inodes, search forward from the parent directory\'s block
* group to find a free inode.
*/
struct inode * ext2_new_inode (const struct inode * dir, int mode, int * err)
{
struct super_block * sb;
struct buffer_head * bh;
struct buffer_head * bh2;
int i, j, avefreei;
struct inode * inode;
int bitmap_nr;
int bs;
struct ext2_group_desc * gdp;
struct ext2_group_desc * tmp;
struct ext2_super_block * es;
if (!dir || !(inode = get_empty_inode ()))
{
*err=-ENOMEM;
return NULL;
}
sb = dir->i_sb;
inode->i_sb = sb;
inode->i_flags = sb->s_flags;
lock_super (sb);
bs = BYTE_SWAP(sb->u.ext2_sb.s_byte_swapped);
es = sb->u.ext2_sb.s_es;
repeat:
gdp = NULL; i=0;
*err = -ENOSPC;
if (S_ISDIR(mode)) {
avefreei = e_swab (bs, es->s_free_inodes_count) /
sb->u.ext2_sb.s_groups_count;
/* I am not yet convinced that this next bit is necessary.
i = dir->u.ext2_i.i_block_group;
for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
tmp = get_group_desc (sb, i, &bh2);
if ((e_swab (bs, tmp->bg_used_dirs_count) << 8) <
e_swab (bs, tmp->bg_free_inodes_count)) {
gdp = tmp;
break;
}
else
i = ++i % sb->u.ext2_sb.s_groups_count;
}
*/
if (!gdp) {
for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
tmp = get_group_desc (sb, j, &bh2);
if (e_swab (bs, tmp->bg_free_inodes_count) &&
e_swab (bs, tmp->bg_free_inodes_count) >= avefreei) {
if (!gdp ||
(e_swab (bs, tmp->bg_free_blocks_count) >
e_swab (bs, gdp->bg_free_blocks_count))) {
i = j;
gdp = tmp;
}
}
}
}
}
else
{
/*
* Try to place the inode in its parent directory
*/
i = dir->u.ext2_i.i_block_group;
tmp = get_group_desc (sb, i, &bh2);
if (tmp->bg_free_inodes_count)
gdp = tmp;
else
{
/*
* Use a quadratic hash to find a group with a
* free inode
*/
for (j = 1; j < sb->u.ext2_sb.s_groups_count; j <<= 1) {
i += j;
if (i >= sb->u.ext2_sb.s_groups_count)
i -= sb->u.ext2_sb.s_groups_count;
tmp = get_group_desc (sb, i, &bh2);
if (tmp->bg_free_inodes_count) {
gdp = tmp;
break;
}
}
}
if (!gdp) {
/*
* That failed: try linear search for a free inode
*/
i = dir->u.ext2_i.i_block_group + 1;
for (j = 2; j < sb->u.ext2_sb.s_groups_count; j++) {
if (++i >= sb->u.ext2_sb.s_groups_count)
i = 0;
tmp = get_group_desc (sb, i, &bh2);
if (tmp->bg_free_inodes_count) {
gdp = tmp;
break;
}
}
}
}
if (!gdp) {
unlock_super (sb);
iput(inode);
return NULL;
}
bitmap_nr = load_inode_bitmap (sb, i);
if (bitmap_nr < 0) {
unlock_super (sb);
iput(inode);
*err = -EIO;
return NULL;
}
bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
if ((j = ext2_find_first_zero_bit ((unsigned long *) bh->b_data,
EXT2_INODES_PER_GROUP(sb))) <
EXT2_INODES_PER_GROUP(sb)) {
if (ext2_set_bit (j, bh->b_data)) {
ext2_warning (sb, "ext2_new_inode",
"bit already set for inode %d", j);
goto repeat;
}
mark_buffer_dirty(bh, 1);
if (sb->s_flags & MS_SYNCHRONOUS) {
ll_rw_block (WRITE, 1, &bh);
wait_on_buffer (bh);
}
} else {
if (gdp->bg_free_inodes_count != 0) {
ext2_error (sb, "ext2_new_inode",
"Free inodes count corrupted in group %d",
i);
unlock_super (sb);
iput (inode);
return NULL;
}
goto repeat;
}
j += i * EXT2_INODES_PER_GROUP(sb) + 1;
if (j < EXT2_FIRST_INO(sb) || j > e_swab (bs, es->s_inodes_count)) {
ext2_error (sb, "ext2_new_inode",
"reserved inode or inode > inodes count - "
"block_group = %d,inode=%d", i, j);
unlock_super (sb);
iput (inode);
return NULL;
}
e_set_swab (bs, gdp->bg_free_inodes_count,
e_swab (bs, gdp->bg_free_inodes_count) - 1);
if (S_ISDIR(mode))
e_set_swab (bs, gdp->bg_used_dirs_count,
e_swab (bs, gdp->bg_used_dirs_count) + 1);
mark_buffer_dirty(bh2, 1);
e_set_swab (bs, es->s_free_inodes_count,
e_swab (bs, es->s_free_inodes_count) - 1);
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
sb->s_dirt = 1;
inode->i_mode = mode;
inode->i_sb = sb;
inode->i_count = 1;
inode->i_nlink = 1;
inode->i_dev = sb->s_dev;
inode->i_uid = current->fsuid;
if (test_opt (sb, GRPID))
inode->i_gid = dir->i_gid;
else if (dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
if (S_ISDIR(mode))
mode |= S_ISGID;
} else
inode->i_gid = current->fsgid;
inode->i_dirt = 1;
inode->i_ino = j;
inode->i_blksize = PAGE_SIZE; /* This is the optimal IO size (for stat), not the fs block size */
inode->i_blocks = 0;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
inode->u.ext2_i.i_new_inode = 1;
inode->u.ext2_i.i_flags = dir->u.ext2_i.i_flags;
if (S_ISLNK(mode))
inode->u.ext2_i.i_flags &= ~(EXT2_IMMUTABLE_FL | EXT2_APPEND_FL);
inode->u.ext2_i.i_faddr = 0;
inode->u.ext2_i.i_frag_no = 0;
inode->u.ext2_i.i_frag_size = 0;
inode->u.ext2_i.i_file_acl = 0;
inode->u.ext2_i.i_dir_acl = 0;
inode->u.ext2_i.i_dtime = 0;
inode->u.ext2_i.i_block_group = i;
inode->i_op = NULL;
if (inode->u.ext2_i.i_flags & EXT2_SYNC_FL)
inode->i_flags |= MS_SYNCHRONOUS;
insert_inode_hash(inode);
inc_inode_version (inode, gdp, mode);
unlock_super (sb);
if (sb->dq_op) {
sb->dq_op->initialize (inode, -1);
if (sb->dq_op->alloc_inode (inode, 1)) {
sb->dq_op->drop (inode);
inode->i_nlink = 0;
iput (inode);
*err = -EDQUOT;
return NULL;
}
inode->i_flags |= S_WRITE;
}
ext2_debug ("allocating inode %lu\n", inode->i_ino);
*err = 0;
return inode;
}
void ext2_free_inode (struct inode * inode)
{
struct super_block * sb;
struct buffer_head * bh;
struct buffer_head * bh2;
unsigned long block_group;
unsigned long bit;
int bitmap_nr;
int bs;
struct ext2_group_desc * gdp;
struct ext2_super_block * es;
if (!inode)
return;
if (!inode->i_dev) {
printk ("ext2_free_inode: inode has no device\n");
return;
}
if (inode->i_count > 1) {
printk ("ext2_free_inode: inode has count=%ld\n",
inode->i_count);
return;
}
if (inode->i_nlink) {
printk ("ext2_free_inode: inode has nlink=%d\n",
inode->i_nlink);
return;
}
sb = inode->i_sb;
if (!sb) {
printk("ext2_free_inode: inode on nonexistent device\n");
return;
}
ext2_debug ("freeing inode %lu\n", inode->i_ino);
/* We need to kill quota references now, before grabbing the
* superblock lock because writing the quota out to disk
* may need to lock the superblock as well.
*
* It is safe to do this early instead of the original
* places because we cannot be here in ext2_free_inode
* if any other references to this inode exist at all.
*
* Based upon a 2.1.x fix by Bill Hawes. --DaveM
*/
if (sb->dq_op) {
sb->dq_op->free_inode (inode, 1);
if (IS_WRITABLE (inode))
sb->dq_op->drop(inode);
}
lock_super (sb);
bs = BYTE_SWAP(inode->i_sb->u.ext2_sb.s_byte_swapped);
if (inode->i_ino < EXT2_FIRST_INO(sb) ||
inode->i_ino > e_swab (bs, sb->u.ext2_sb.s_es->s_inodes_count)) {
ext2_error (sb, "free_inode",
"reserved inode or nonexistent inode");
unlock_super (sb);
return;
}
es = sb->u.ext2_sb.s_es;
block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(sb);
bit = (inode->i_ino - 1) % EXT2_INODES_PER_GROUP(sb);
bitmap_nr = load_inode_bitmap (sb, block_group);
if (bitmap_nr < 0) {
unlock_super (sb);
return;
}
bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
if (!ext2_clear_bit (bit, bh->b_data))
ext2_warning (sb, "ext2_free_inode",
"bit already cleared for inode %lu", inode->i_ino);
else {
gdp = get_group_desc (sb, block_group, &bh2);
e_set_swab (bs, gdp->bg_free_inodes_count,
e_swab (bs, gdp->bg_free_inodes_count) + 1);
if (S_ISDIR(inode->i_mode))
e_set_swab (bs, gdp->bg_used_dirs_count,
e_swab (bs, gdp->bg_used_dirs_count) - 1);
mark_buffer_dirty(bh2, 1);
e_set_swab (bs, es->s_free_inodes_count,
e_swab (bs, es->s_free_inodes_count) + 1);
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
inode->i_dirt = 0;
}
mark_buffer_dirty(bh, 1);
if (sb->s_flags & MS_SYNCHRONOUS) {
ll_rw_block (WRITE, 1, &bh);
wait_on_buffer (bh);
}
sb->s_dirt = 1;
clear_inode (inode);
unlock_super (sb);
}
