lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[XFS] XFS: ASCII case-insensitive support

Browse Source 
Implement ASCII case-insensitive support. It's primary purpose is for
supporting existing filesystems that already use this case-insensitive
mode migrated from IRIX. But, if you only need ASCII-only case-insensitive
support (ie. English only) and will never use another language, then this
mode is perfectly adequate.

ASCII-CI is implemented by generating hashes based on lower-case letters
and doing lower-case compares. It implements a new xfs_nameops vector for
doing the hashes and comparisons for all filename operations.

To create a filesystem with this CI mode, use: # mkfs.xfs -n version=ci
<device>

SGI-PV: 981516
SGI-Modid: xfs-linux-melb:xfs-kern:31209a

Signed-off-by: Barry Naujok <bnaujok@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
This commit is contained in:
Barry Naujok
2008-05-21 16:58:55 +10:00
committed by Niv Sardi
parent 384f3ced07
commit 189f4bf22b
6 changed files with 68 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
fs/xfs/xfs_dir2.c
View File

@@ -48,6 +48,52 @@ struct xfs_name xfs_name_dotdot = {"..", 2};
extern const struct xfs_nameops xfs_default_nameops;
/*
* ASCII case-insensitive (ie. A-Z) support for directories that was
* used in IRIX.
*/
STATIC xfs_dahash_t
xfs_ascii_ci_hashname(
struct xfs_name *name)
{
xfs_dahash_t hash;
int i;
for (i = 0, hash = 0; i < name->len; i++)
hash = tolower(name->name[i]) ^ rol32(hash, 7);
return hash;
}
STATIC enum xfs_dacmp
xfs_ascii_ci_compname(
struct xfs_da_args *args,
const char *name,
int len)
{
enum xfs_dacmp result;
int i;
if (args->namelen != len)
return XFS_CMP_DIFFERENT;
result = XFS_CMP_EXACT;
for (i = 0; i < len; i++) {
if (args->name[i] == name[i])
continue;
if (tolower(args->name[i]) != tolower(name[i]))
return XFS_CMP_DIFFERENT;
result = XFS_CMP_CASE;
}
return result;
}
static struct xfs_nameops xfs_ascii_ci_nameops = {
.hashname = xfs_ascii_ci_hashname,
.compname = xfs_ascii_ci_compname,
};
void
xfs_dir_mount(
xfs_mount_t *mp)
@@ -67,7 +113,10 @@ xfs_dir_mount(
(mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
(uint)sizeof(xfs_da_node_entry_t);
mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
mp->m_dirnameops = &xfs_default_nameops;
if (xfs_sb_version_hasasciici(&mp->m_sb))
mp->m_dirnameops = &xfs_ascii_ci_nameops;
else
mp->m_dirnameops = &xfs_default_nameops;
}
/*