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[GFS2] Shrink & rename di_depth

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This patch forms a pair with the previous patch which shrunk
di_height. Like that patch di_depth is renamed i_depth and moved
into struct gfs2_inode directly. Also the field goes from 16 bits
to 8 bits since it is also limited to a max value which is rather
small (17 in this case). In addition we also now validate the field
against this maximum value when its read in.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse
2008-02-01 09:23:44 +00:00
parent cf45b752c9
commit 9a0045088d
3 changed files with 25 additions and 22 deletions
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34
fs/gfs2/dir.c
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@@ -757,7 +757,7 @@ static struct gfs2_dirent *gfs2_dirent_search(struct inode *inode,
if (ip->i_di.di_flags & GFS2_DIF_EXHASH) {
struct gfs2_leaf *leaf;
unsigned hsize = 1 << ip->i_di.di_depth;
unsigned hsize = 1 << ip->i_depth;
unsigned index;
u64 ln;
if (hsize * sizeof(u64) != ip->i_di.di_size) {
@@ -765,7 +765,7 @@ static struct gfs2_dirent *gfs2_dirent_search(struct inode *inode,
return ERR_PTR(-EIO);
}
index = name->hash >> (32 - ip->i_di.di_depth);
index = name->hash >> (32 - ip->i_depth);
error = get_first_leaf(ip, index, &bh);
if (error)
return ERR_PTR(error);
@@ -910,7 +910,7 @@ static int dir_make_exhash(struct inode *inode)
dip->i_di.di_flags |= GFS2_DIF_EXHASH;
for (x = sdp->sd_hash_ptrs, y = -1; x; x >>= 1, y++) ;
dip->i_di.di_depth = y;
dip->i_depth = y;
gfs2_dinode_out(dip, dibh->b_data);
@@ -941,7 +941,7 @@ static int dir_split_leaf(struct inode *inode, const struct qstr *name)
int x, moved = 0;
int error;
index = name->hash >> (32 - dip->i_di.di_depth);
index = name->hash >> (32 - dip->i_depth);
error = get_leaf_nr(dip, index, &leaf_no);
if (error)
return error;
@@ -952,7 +952,7 @@ static int dir_split_leaf(struct inode *inode, const struct qstr *name)
return error;
oleaf = (struct gfs2_leaf *)obh->b_data;
if (dip->i_di.di_depth == be16_to_cpu(oleaf->lf_depth)) {
if (dip->i_depth == be16_to_cpu(oleaf->lf_depth)) {
brelse(obh);
return 1; /* can't split */
}
@@ -967,10 +967,10 @@ static int dir_split_leaf(struct inode *inode, const struct qstr *name)
bn = nbh->b_blocknr;
/* Compute the start and len of leaf pointers in the hash table. */
len = 1 << (dip->i_di.di_depth - be16_to_cpu(oleaf->lf_depth));
len = 1 << (dip->i_depth - be16_to_cpu(oleaf->lf_depth));
half_len = len >> 1;
if (!half_len) {
printk(KERN_WARNING "di_depth %u lf_depth %u index %u\n", dip->i_di.di_depth, be16_to_cpu(oleaf->lf_depth), index);
printk(KERN_WARNING "i_depth %u lf_depth %u index %u\n", dip->i_depth, be16_to_cpu(oleaf->lf_depth), index);
gfs2_consist_inode(dip);
error = -EIO;
goto fail_brelse;
@@ -997,7 +997,7 @@ static int dir_split_leaf(struct inode *inode, const struct qstr *name)
kfree(lp);
/* Compute the divider */
divider = (start + half_len) << (32 - dip->i_di.di_depth);
divider = (start + half_len) << (32 - dip->i_depth);
/* Copy the entries */
dirent_first(dip, obh, &dent);
@@ -1082,7 +1082,7 @@ static int dir_double_exhash(struct gfs2_inode *dip)
int x;
int error = 0;
hsize = 1 << dip->i_di.di_depth;
hsize = 1 << dip->i_depth;
if (hsize * sizeof(u64) != dip->i_di.di_size) {
gfs2_consist_inode(dip);
return -EIO;
@@ -1125,7 +1125,7 @@ static int dir_double_exhash(struct gfs2_inode *dip)
error = gfs2_meta_inode_buffer(dip, &dibh);
if (!gfs2_assert_withdraw(sdp, !error)) {
dip->i_di.di_depth++;
dip->i_depth++;
gfs2_dinode_out(dip, dibh->b_data);
brelse(dibh);
}
@@ -1370,14 +1370,14 @@ static int dir_e_read(struct inode *inode, u64 *offset, void *opaque,
int error = 0;
unsigned depth = 0;
hsize = 1 << dip->i_di.di_depth;
hsize = 1 << dip->i_depth;
if (hsize * sizeof(u64) != dip->i_di.di_size) {
gfs2_consist_inode(dip);
return -EIO;
}
hash = gfs2_dir_offset2hash(*offset);
index = hash >> (32 - dip->i_di.di_depth);
index = hash >> (32 - dip->i_depth);
lp = kmalloc(sdp->sd_hash_bsize, GFP_KERNEL);
if (!lp)
@@ -1405,7 +1405,7 @@ static int dir_e_read(struct inode *inode, u64 *offset, void *opaque,
if (error)
break;
len = 1 << (dip->i_di.di_depth - depth);
len = 1 << (dip->i_depth - depth);
index = (index & ~(len - 1)) + len;
}
@@ -1549,7 +1549,7 @@ static int dir_new_leaf(struct inode *inode, const struct qstr *name)
u32 index;
u64 bn;
index = name->hash >> (32 - ip->i_di.di_depth);
index = name->hash >> (32 - ip->i_depth);
error = get_first_leaf(ip, index, &obh);
if (error)
return error;
@@ -1641,7 +1641,7 @@ int gfs2_dir_add(struct inode *inode, const struct qstr *name,
continue;
if (error < 0)
break;
if (ip->i_di.di_depth < GFS2_DIR_MAX_DEPTH) {
if (ip->i_depth < GFS2_DIR_MAX_DEPTH) {
error = dir_double_exhash(ip);
if (error)
break;
@@ -1785,7 +1785,7 @@ static int foreach_leaf(struct gfs2_inode *dip, leaf_call_t lc, void *data)
u64 leaf_no;
int error = 0;
hsize = 1 << dip->i_di.di_depth;
hsize = 1 << dip->i_depth;
if (hsize * sizeof(u64) != dip->i_di.di_size) {
gfs2_consist_inode(dip);
return -EIO;
@@ -1817,7 +1817,7 @@ static int foreach_leaf(struct gfs2_inode *dip, leaf_call_t lc, void *data)
if (error)
goto out;
leaf = (struct gfs2_leaf *)bh->b_data;
len = 1 << (dip->i_di.di_depth - be16_to_cpu(leaf->lf_depth));
len = 1 << (dip->i_depth - be16_to_cpu(leaf->lf_depth));
brelse(bh);
error = lc(dip, index, len, leaf_no, data);