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ufs_trunc_branch(): kill recursion 

turn recursion into a pair of loops

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-06-18 19:13:02 -04:00
parent 6aab6dd379
commit 7b4e4f7f81
1 changed files with 26 additions and 26 deletions
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52
fs/ufs/inode.c
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@ -1124,34 +1124,14 @@ static void free_full_branch(struct inode *inode, int depth, void *p)
mark_inode_dirty(inode);
}
static void ufs_trunc_branch(struct inode *inode, unsigned *offsets, int depth2, int depth, void *p)
static void free_branch_tail(struct inode *inode, unsigned from, struct ufs_buffer_head *ubh, int depth)
{
struct super_block *sb = inode->i_sb;
struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
struct ufs_inode_info *ufsi = UFS_I(inode);
struct ufs_buffer_head *ubh;
u64 tmp;
unsigned from = *offsets++;
unsigned i;
tmp = ufs_data_ptr_to_cpu(sb, p);
if (!tmp)
return;
ubh = ubh_bread (sb, tmp, uspi->s_bsize);
if (!ubh) {
write_seqlock(&ufsi->meta_lock);
ufs_data_ptr_clear(uspi, p);
write_sequnlock(&ufsi->meta_lock);
return;
}
if (--depth2) {
void *ind = ubh_get_data_ptr(uspi, ubh, from++);
ufs_trunc_branch(inode, offsets, depth2, depth - 1, ind);
ubh_mark_buffer_dirty(ubh);
}
if (--depth) {
for (i = from ; i < uspi->s_apb ; i++) {
for (i = from; i < uspi->s_apb ; i++) {
void *ind = ubh_get_data_ptr(uspi, ubh, i);
free_full_branch(inode, depth, ind);
ubh_mark_buffer_dirty(ubh);
@ -1161,7 +1141,7 @@ static void ufs_trunc_branch(struct inode *inode, unsigned *offsets, int depth2,
for (i = from; i < uspi->s_apb; i++) {
void *ind = ubh_get_data_ptr(uspi, ubh, i);
tmp = ufs_data_ptr_to_cpu(sb, ind);
u64 tmp = ufs_data_ptr_to_cpu(sb, ind);
if (!tmp)
continue;
@ -1258,6 +1238,9 @@ static void __ufs_truncate_blocks(struct inode *inode)
int depth = ufs_block_to_path(inode, DIRECT_BLOCK, offsets);
int depth2;
unsigned i;
struct ufs_buffer_head *ubh[3];
void *p;
u64 block;
if (!depth)
return;
@ -1272,9 +1255,26 @@ static void __ufs_truncate_blocks(struct inode *inode)
ufs_trunc_direct(inode);
offsets[0] = UFS_IND_BLOCK;
} else {
if (depth2)
ufs_trunc_branch(inode, offsets + 1, depth2, depth - 1,
ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]++));
/* get the blocks that should be partially emptied */
p = ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]);
for (i = 0; i < depth2; i++) {
offsets[i]++; /* next branch is fully freed */
block = ufs_data_ptr_to_cpu(sb, p);
if (!block)
break;
ubh[i] = ubh_bread(sb, block, uspi->s_bsize);
if (!ubh[i]) {
write_seqlock(&ufsi->meta_lock);
ufs_data_ptr_clear(uspi, p);
write_sequnlock(&ufsi->meta_lock);
break;
}
p = ubh_get_data_ptr(uspi, ubh[i], offsets[i + 1]);
}
while (i--) {
ubh_mark_buffer_dirty(ubh[i]);
free_branch_tail(inode, offsets[i + 1], ubh[i], depth - i - 1);
}
}
for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {
free_full_branch(inode, i - UFS_IND_BLOCK + 1,