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ufs_trunc_...indirect(): pass the array of indices instead of offsets

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rather than bitslicing the offset just formed as sum of shifted indices,
pass the array of those indices itself.  NULL is used as equivalent
of "all zeroes" (== free the entire branch).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-06-18 14:36:31 -04:00
parent 7a4fdda724
commit 85416288bf
1 changed files with 22 additions and 28 deletions
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50
fs/ufs/inode.c
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@ -1069,7 +1069,7 @@ static void ufs_trunc_direct(struct inode *inode)
}
static void ufs_trunc_indirect(struct inode *inode, unsigned from, void *p)
static void ufs_trunc_indirect(struct inode *inode, unsigned *offsets, void *p)
{
struct super_block *sb = inode->i_sb;
struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
@ -1077,7 +1077,8 @@ static void ufs_trunc_indirect(struct inode *inode, unsigned from, void *p)
void *ind;
u64 tmp, frag_to_free = 0;
unsigned free_count = 0;
bool to_free = !from;
unsigned from = offsets ? *offsets : 0;
bool to_free = !offsets || !from;
unsigned i;
tmp = ufs_data_ptr_to_cpu(sb, p);
@ -1134,16 +1135,15 @@ static void ufs_trunc_indirect(struct inode *inode, unsigned from, void *p)
ubh_brelse (ind_ubh);
}
static void ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p)
static void ufs_trunc_dindirect(struct inode *inode, unsigned *offsets, void *p)
{
struct super_block *sb = inode->i_sb;
struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
struct ufs_buffer_head *dind_bh;
u64 tmp;
void *dind;
bool free_it = !offset;
unsigned dindirect_block = offset >> uspi->s_apbshift;
unsigned from = offset & uspi->s_apbmask;
bool free_it = !offsets || !(offsets[0] || offsets[1]);
unsigned dindirect_block = offsets ? *offsets++ : 0;
unsigned i;
tmp = ufs_data_ptr_to_cpu(sb, p);
@ -1157,12 +1157,12 @@ static void ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p)
return;
}
for (i = dindirect_block ; i < uspi->s_apb ; i++, from = 0) {
for (i = dindirect_block ; i < uspi->s_apb ; i++, offsets = NULL) {
dind = ubh_get_data_ptr(uspi, dind_bh, i);
tmp = ufs_data_ptr_to_cpu(sb, dind);
if (!tmp)
continue;
ufs_trunc_indirect(inode, from, dind);
ufs_trunc_indirect(inode, offsets, dind);
ubh_mark_buffer_dirty(dind_bh);
}
@ -1182,7 +1182,7 @@ static void ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p)
ubh_brelse (dind_bh);
}
static void ufs_trunc_tindirect(struct inode *inode, u64 offset)
static void ufs_trunc_tindirect(struct inode *inode, unsigned *offsets)
{
struct super_block *sb = inode->i_sb;
struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
@ -1190,12 +1190,10 @@ static void ufs_trunc_tindirect(struct inode *inode, u64 offset)
struct ufs_buffer_head * tind_bh;
u64 tmp;
void *tind, *p;
bool free_it = !offset;
unsigned tindirect_block = offset >> uspi->s_2apbshift;
bool free_it = !offsets || !(offsets[0] || offsets[1] || offsets[2]);
unsigned tindirect_block = offsets ? *offsets++ : 0;
unsigned i;
offset -= tindirect_block << uspi->s_2apbshift;
p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
return;
@ -1207,9 +1205,9 @@ static void ufs_trunc_tindirect(struct inode *inode, u64 offset)
return;
}
for (i = tindirect_block ; i < uspi->s_apb ; i++, offset = 0) {
for (i = tindirect_block ; i < uspi->s_apb ; i++, offsets = NULL) {
tind = ubh_get_data_ptr(uspi, tind_bh, i);
ufs_trunc_dindirect(inode, offset, tind);
ufs_trunc_dindirect(inode, offsets, tind);
ubh_mark_buffer_dirty(tind_bh);
}
if (free_it) {
@ -1310,30 +1308,26 @@ static void __ufs_truncate_blocks(struct inode *inode)
switch (depth) {
case 1:
ufs_trunc_direct(inode);
ufs_trunc_indirect(inode, 0,
ufs_trunc_indirect(inode, NULL,
ufs_get_direct_data_ptr(uspi, ufsi, UFS_IND_BLOCK));
ufs_trunc_dindirect(inode, 0,
ufs_trunc_dindirect(inode, NULL,
ufs_get_direct_data_ptr(uspi, ufsi, UFS_DIND_BLOCK));
ufs_trunc_tindirect(inode, 0);
ufs_trunc_tindirect(inode, NULL);
break;
case 2:
ufs_trunc_indirect(inode, offsets[1],
ufs_trunc_indirect(inode, offsets + 1,
ufs_get_direct_data_ptr(uspi, ufsi, UFS_IND_BLOCK));
ufs_trunc_dindirect(inode, 0,
ufs_trunc_dindirect(inode, NULL,
ufs_get_direct_data_ptr(uspi, ufsi, UFS_DIND_BLOCK));
ufs_trunc_tindirect(inode, 0);
ufs_trunc_tindirect(inode, NULL);
break;
case 3:
ufs_trunc_dindirect(inode,
(offsets[1] << uspi->s_apbshift) + offsets[2],
ufs_trunc_dindirect(inode, offsets + 1,
ufs_get_direct_data_ptr(uspi, ufsi, UFS_DIND_BLOCK));
ufs_trunc_tindirect(inode, 0);
ufs_trunc_tindirect(inode, NULL);
break;
case 4:
ufs_trunc_tindirect(inode,
(offsets[1] << uspi->s_2apbshift) +
(offsets[2] << uspi->s_apbshift) +
offsets[3]);
ufs_trunc_tindirect(inode, offsets + 1);
}
ufsi->i_lastfrag = DIRECT_FRAGMENT;
mutex_unlock(&ufsi->truncate_mutex);