[PATCH 03/13] libxfs: add xfs_nameops.normhash

Ben Myers
2014-09-11T20:53:57Z

Add a normhash callout to the xfs_nameops. This callout takes an xfs_da_args
structure as its argument, and calculates a hash value over the name. It may
in the process create a normalized form of the name, and assign that to the
norm/normlen fields in the xfs_da_args structure.

Changes:
The pointer in kmem_free() was type converted to suppress compiler
warnings.

Signed-off-by: Olaf Weber <olaf@sgi.com>
---
include/xfs_da_btree.h | 5 ++++-
libxfs/xfs_da_btree.c | 9 ++++++++
libxfs/xfs_dir2.c | 56 +++++++++++++++++++++++++++++++++++++++-----------
3 files changed, 57 insertions(+), 13 deletions(-)

diff --git a/include/xfs_da_btree.h b/include/xfs_da_btree.h
index 3d9f9dd..06b50bf 100644
--- a/include/xfs_da_btree.h
+++ b/include/xfs_da_btree.h
@@ -42,7 +42,9 @@ enum xfs_dacmp {
*/
typedef struct xfs_da_args {
const __uint8_t *name; /* string (maybe not NULL terminated) */
- int namelen; /* length of string (maybe no NULL) */
+ const __uint8_t *norm; /* normalized name (may be NULL) */
+ int namelen; /* length of string (maybe no NULL) */
+ int normlen; /* length of normalized name */
__uint8_t filetype; /* filetype of inode for directories */
__uint8_t *value; /* set of bytes (maybe contain NULLs) */
int valuelen; /* length of value */
@@ -131,6 +133,7 @@ typedef struct xfs_da_state {
*/
struct xfs_nameops {
xfs_dahash_t (*hashname)(struct xfs_name *);
+ int (*normhash)(struct xfs_da_args *);
enum xfs_dacmp (*compname)(struct xfs_da_args *,
const unsigned char *, int);
};
diff --git a/libxfs/xfs_da_btree.c b/libxfs/xfs_da_btree.c
index b731b54..eb97317 100644
--- a/libxfs/xfs_da_btree.c
+++ b/libxfs/xfs_da_btree.c
@@ -2000,8 +2000,17 @@ xfs_default_hashname(
return xfs_da_hashname(name->name, name->len);
}

+STATIC int
+xfs_da_normhash(
+ struct xfs_da_args *args)
+{
+ args->hashval = xfs_da_hashname(args->name, args->namelen);
+ return 0;
+}
+
const struct xfs_nameops xfs_default_nameops = {
.hashname = xfs_default_hashname,
+ .normhash = xfs_da_normhash,
.compname = xfs_da_compname
};

diff --git a/libxfs/xfs_dir2.c b/libxfs/xfs_dir2.c
index 57e98a3..e52d082 100644
--- a/libxfs/xfs_dir2.c
+++ b/libxfs/xfs_dir2.c
@@ -54,6 +54,21 @@ xfs_ascii_ci_hashname(
return hash;
}

+STATIC int
+xfs_ascii_ci_normhash(
+ struct xfs_da_args *args)
+{
+ xfs_dahash_t hash;
+ int i;
+
+ for (i = 0, hash = 0; i < args->namelen; i++)
+ hash = tolower(args->name[i]) ^ rol32(hash, 7);
+
+ args->hashval = hash;
+ return 0;
+}
+
+
STATIC enum xfs_dacmp
xfs_ascii_ci_compname(
struct xfs_da_args *args,
@@ -80,6 +95,7 @@ xfs_ascii_ci_compname(

static struct xfs_nameops xfs_ascii_ci_nameops = {
.hashname = xfs_ascii_ci_hashname,
+ .normhash = xfs_ascii_ci_normhash,
.compname = xfs_ascii_ci_compname,
};

@@ -211,7 +227,6 @@ xfs_dir_createname(
args.name = name->name;
args.namelen = name->len;
args.filetype = name->type;
- args.hashval = dp->i_mount->m_dirnameops->hashname(name);
args.inumber = inum;
args.dp = dp;
args.firstblock = first;
@@ -220,19 +235,24 @@ xfs_dir_createname(
args.whichfork = XFS_DATA_FORK;
args.trans = tp;
args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
+ if ((rval = dp->i_mount->m_dirnameops->normhash(&args)))
+ return rval;

if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
rval = xfs_dir2_sf_addname(&args);
else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
- return rval;
+ goto out_free;
else if (v)
rval = xfs_dir2_block_addname(&args);
else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
- return rval;
+ goto out_free;
else if (v)
rval = xfs_dir2_leaf_addname(&args);
else
rval = xfs_dir2_node_addname(&args);
+out_free:
+ if (args.norm)
+ kmem_free((void *)args.norm);
return rval;
}

@@ -289,22 +309,23 @@ xfs_dir_lookup(
args.name = name->name;
args.namelen = name->len;
args.filetype = name->type;
- args.hashval = dp->i_mount->m_dirnameops->hashname(name);
args.dp = dp;
args.whichfork = XFS_DATA_FORK;
args.trans = tp;
args.op_flags = XFS_DA_OP_OKNOENT;
if (ci_name)
args.op_flags |= XFS_DA_OP_CILOOKUP;
+ if ((rval = dp->i_mount->m_dirnameops->normhash(&args)))
+ return rval;

if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
rval = xfs_dir2_sf_lookup(&args);
else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
- return rval;
+ goto out_free;
else if (v)
rval = xfs_dir2_block_lookup(&args);
else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
- return rval;
+ goto out_free;
else if (v)
rval = xfs_dir2_leaf_lookup(&args);
else
@@ -318,6 +339,9 @@ xfs_dir_lookup(
ci_name->len = args.valuelen;
}
}
+out_free:
+ if (args.norm)
+ kmem_free((void *)args.norm);
return rval;
}

@@ -345,7 +369,6 @@ xfs_dir_removename(
args.name = name->name;
args.namelen = name->len;
args.filetype = name->type;
- args.hashval = dp->i_mount->m_dirnameops->hashname(name);
args.inumber = ino;
args.dp = dp;
args.firstblock = first;
@@ -353,19 +376,24 @@ xfs_dir_removename(
args.total = total;
args.whichfork = XFS_DATA_FORK;
args.trans = tp;
+ if ((rval = dp->i_mount->m_dirnameops->normhash(&args)))
+ return rval;

if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
rval = xfs_dir2_sf_removename(&args);
else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
- return rval;
+ goto out_free;
else if (v)
rval = xfs_dir2_block_removename(&args);
else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
- return rval;
+ goto out_free;
else if (v)
rval = xfs_dir2_leaf_removename(&args);
else
rval = xfs_dir2_node_removename(&args);
+out_free:
+ if (args.norm)
+ kmem_free((void *)args.norm);
return rval;
}

@@ -395,7 +423,6 @@ xfs_dir_replace(
args.name = name->name;
args.namelen = name->len;
args.filetype = name->type;
- args.hashval = dp->i_mount->m_dirnameops->hashname(name);
args.inumber = inum;
args.dp = dp;
args.firstblock = first;
@@ -403,19 +430,24 @@ xfs_dir_replace(
args.total = total;
args.whichfork = XFS_DATA_FORK;
args.trans = tp;
+ if ((rval = dp->i_mount->m_dirnameops->normhash(&args)))
+ return rval;

if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
rval = xfs_dir2_sf_replace(&args);
else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
- return rval;
+ goto out_free;
else if (v)
rval = xfs_dir2_block_replace(&args);
else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
- return rval;
+ goto out_free;
else if (v)
rval = xfs_dir2_leaf_replace(&args);
else
rval = xfs_dir2_node_replace(&args);
+out_free:
+ if (args.norm)
+ kmem_free((void *)args.norm);
return rval;