Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d45bce8faf55511ec7d7ffc301461d864d67f1af
Commit: d45bce8faf55511ec7d7ffc301461d864d67f1af
Parent: 1e96b7ca1e8f17c5117da369daaa7cf2edfdf9b1
Author: Duane Griffin <[EMAIL PROTECTED]>
AuthorDate: Sun Jul 15 23:41:23 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Mon Jul 16 09:05:49 2007 -0700
HFS+: add custom dentry hash and comparison operations
Add custom dentry hash and comparison operations for HFS+ filesystems that
are
case-insensitive and/or do automatic unicode decomposition. The new
operations reuse the existing HFS+ ASCII to unicode conversion, unicode
decomposition and case folding functionality.
Signed-off-by: Duane Griffin <[EMAIL PROTECTED]>
Signed-off-by: Roman Zippel <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
fs/hfsplus/btree.c | 4 +-
fs/hfsplus/dir.c | 2 +
fs/hfsplus/hfsplus_fs.h | 4 ++
fs/hfsplus/inode.c | 5 ++
fs/hfsplus/super.c | 1 +
fs/hfsplus/unicode.c | 123 +++++++++++++++++++++++++++++++++++++++++++++++
6 files changed, 138 insertions(+), 1 deletions(-)
diff --git a/fs/hfsplus/btree.c b/fs/hfsplus/btree.c
index 90ebab7..050d29c 100644
--- a/fs/hfsplus/btree.c
+++ b/fs/hfsplus/btree.c
@@ -62,8 +62,10 @@ struct hfs_btree *hfs_btree_open(struct super_block *sb, u32
id)
if ((HFSPLUS_SB(sb).flags & HFSPLUS_SB_HFSX) &&
(head->key_type == HFSPLUS_KEY_BINARY))
tree->keycmp = hfsplus_cat_bin_cmp_key;
- else
+ else {
tree->keycmp = hfsplus_cat_case_cmp_key;
+ HFSPLUS_SB(sb).flags |= HFSPLUS_SB_CASEFOLD;
+ }
} else {
printk(KERN_ERR "hfs: unknown B*Tree requested\n");
goto fail_page;
diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
index 80b5682..1955ee6 100644
--- a/fs/hfsplus/dir.c
+++ b/fs/hfsplus/dir.c
@@ -36,6 +36,8 @@ static struct dentry *hfsplus_lookup(struct inode *dir,
struct dentry *dentry,
u16 type;
sb = dir->i_sb;
+
+ dentry->d_op = &hfsplus_dentry_operations;
dentry->d_fsdata = NULL;
hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index 3915635..d9f5eda 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -150,6 +150,7 @@ struct hfsplus_sb_info {
#define HFSPLUS_SB_NODECOMPOSE 0x0002
#define HFSPLUS_SB_FORCE 0x0004
#define HFSPLUS_SB_HFSX 0x0008
+#define HFSPLUS_SB_CASEFOLD 0x0010
struct hfsplus_inode_info {
@@ -321,6 +322,7 @@ void hfsplus_file_truncate(struct inode *);
/* inode.c */
extern const struct address_space_operations hfsplus_aops;
extern const struct address_space_operations hfsplus_btree_aops;
+extern struct dentry_operations hfsplus_dentry_operations;
void hfsplus_inode_read_fork(struct inode *, struct hfsplus_fork_raw *);
void hfsplus_inode_write_fork(struct inode *, struct hfsplus_fork_raw *);
@@ -353,6 +355,8 @@ int hfsplus_strcasecmp(const struct hfsplus_unistr *, const
struct hfsplus_unist
int hfsplus_strcmp(const struct hfsplus_unistr *, const struct hfsplus_unistr
*);
int hfsplus_uni2asc(struct super_block *, const struct hfsplus_unistr *, char
*, int *);
int hfsplus_asc2uni(struct super_block *, struct hfsplus_unistr *, const char
*, int);
+int hfsplus_hash_dentry(struct dentry *dentry, struct qstr *str);
+int hfsplus_compare_dentry(struct dentry *dentry, struct qstr *s1, struct qstr
*s2);
/* wrapper.c */
int hfsplus_read_wrapper(struct super_block *);
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index 409ce54..6f7c662 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -131,6 +131,11 @@ const struct address_space_operations hfsplus_aops = {
.writepages = hfsplus_writepages,
};
+struct dentry_operations hfsplus_dentry_operations = {
+ .d_hash = hfsplus_hash_dentry,
+ .d_compare = hfsplus_compare_dentry,
+};
+
static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry
*dentry,
struct nameidata *nd)
{
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 42570c9..6d87a2a 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -380,6 +380,7 @@ static int hfsplus_fill_super(struct super_block *sb, void
*data, int silent)
iput(root);
goto cleanup;
}
+ sb->s_root->d_op = &hfsplus_dentry_operations;
str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
str.name = HFSP_HIDDENDIR_NAME;
diff --git a/fs/hfsplus/unicode.c b/fs/hfsplus/unicode.c
index 5df0052..9e10f94 100644
--- a/fs/hfsplus/unicode.c
+++ b/fs/hfsplus/unicode.c
@@ -314,3 +314,126 @@ int hfsplus_asc2uni(struct super_block *sb, struct
hfsplus_unistr *ustr,
return -ENAMETOOLONG;
return 0;
}
+
+/*
+ * Hash a string to an integer as appropriate for the HFS+ filesystem.
+ * Composed unicode characters are decomposed and case-folding is performed
+ * if the appropriate bits are (un)set on the superblock.
+ */
+int hfsplus_hash_dentry(struct dentry *dentry, struct qstr *str)
+{
+ struct super_block *sb = dentry->d_sb;
+ const char *astr;
+ const u16 *dstr;
+ int casefold, decompose, size, dsize, len;
+ unsigned long hash;
+ wchar_t c;
+ u16 c2;
+
+ casefold = (HFSPLUS_SB(sb).flags & HFSPLUS_SB_CASEFOLD);
+ decompose = !(HFSPLUS_SB(sb).flags & HFSPLUS_SB_NODECOMPOSE);
+ hash = init_name_hash();
+ astr = str->name;
+ len = str->len;
+ while (len > 0) {
+ size = asc2unichar(sb, astr, len, &c);
+ astr += size;
+ len -= size;
+
+ if (decompose && (dstr = decompose_unichar(c, &dsize))) {
+ do {
+ c2 = *dstr++;
+ if (!casefold || (c2 = case_fold(c2)))
+ hash = partial_name_hash(c2, hash);
+ } while (--dsize > 0);
+ } else {
+ c2 = c;
+ if (!casefold || (c2 = case_fold(c2)))
+ hash = partial_name_hash(c2, hash);
+ }
+ }
+ str->hash = end_name_hash(hash);
+
+ return 0;
+}
+
+/*
+ * Compare strings with HFS+ filename ordering.
+ * Composed unicode characters are decomposed and case-folding is performed
+ * if the appropriate bits are (un)set on the superblock.
+ */
+int hfsplus_compare_dentry(struct dentry *dentry, struct qstr *s1, struct qstr
*s2)
+{
+ struct super_block *sb = dentry->d_sb;
+ int casefold, decompose, size;
+ int dsize1, dsize2, len1, len2;
+ const u16 *dstr1, *dstr2;
+ const char *astr1, *astr2;
+ u16 c1, c2;
+ wchar_t c;
+
+ casefold = (HFSPLUS_SB(sb).flags & HFSPLUS_SB_CASEFOLD);
+ decompose = !(HFSPLUS_SB(sb).flags & HFSPLUS_SB_NODECOMPOSE);
+ astr1 = s1->name;
+ len1 = s1->len;
+ astr2 = s2->name;
+ len2 = s2->len;
+ dsize1 = dsize2 = 0;
+ dstr1 = dstr2 = NULL;
+
+ while (len1 > 0 && len2 > 0) {
+ if (!dsize1) {
+ size = asc2unichar(sb, astr1, len1, &c);
+ astr1 += size;
+ len1 -= size;
+
+ if (!decompose || !(dstr1 = decompose_unichar(c,
&dsize1))) {
+ c1 = c;
+ dstr1 = &c1;
+ dsize1 = 1;
+ }
+ }
+
+ if (!dsize2) {
+ size = asc2unichar(sb, astr2, len2, &c);
+ astr2 += size;
+ len2 -= size;
+
+ if (!decompose || !(dstr2 = decompose_unichar(c,
&dsize2))) {
+ c2 = c;
+ dstr2 = &c2;
+ dsize2 = 1;
+ }
+ }
+
+ c1 = *dstr1;
+ c2 = *dstr2;
+ if (casefold) {
+ if (!(c1 = case_fold(c1))) {
+ dstr1++;
+ dsize1--;
+ continue;
+ }
+ if (!(c2 = case_fold(c2))) {
+ dstr2++;
+ dsize2--;
+ continue;
+ }
+ }
+ if (c1 < c2)
+ return -1;
+ else if (c1 > c2)
+ return 1;
+
+ dstr1++;
+ dsize1--;
+ dstr2++;
+ dsize2--;
+ }
+
+ if (len1 < len2)
+ return -1;
+ if (len1 > len2)
+ return 1;
+ return 0;
+}
-
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