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-rw-r--r--fs/ext4/dir.c48
-rw-r--r--fs/ext4/ext4.h21
-rw-r--r--fs/ext4/hash.c34
-rw-r--r--fs/ext4/ialloc.c2
-rw-r--r--fs/ext4/inline.c2
-rw-r--r--fs/ext4/inode.c4
-rw-r--r--fs/ext4/ioctl.c18
-rw-r--r--fs/ext4/namei.c107
-rw-r--r--fs/ext4/super.c6
-rw-r--r--include/linux/fs.h2
10 files changed, 223 insertions, 21 deletions
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 0ccd51f72048..884a6e776809 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -26,6 +26,7 @@
#include <linux/buffer_head.h>
#include <linux/slab.h>
#include <linux/iversion.h>
+#include <linux/unicode.h>
#include "ext4.h"
#include "xattr.h"
@@ -660,3 +661,50 @@ const struct file_operations ext4_dir_operations = {
.open = ext4_dir_open,
.release = ext4_release_dir,
};
+
+#ifdef CONFIG_UNICODE
+static int ext4_d_compare(const struct dentry *dentry, unsigned int len,
+ const char *str, const struct qstr *name)
+{
+ struct qstr qstr = {.name = str, .len = len };
+
+ if (!IS_CASEFOLDED(dentry->d_parent->d_inode)) {
+ if (len != name->len)
+ return -1;
+ return !memcmp(str, name, len);
+ }
+
+ return ext4_ci_compare(dentry->d_parent->d_inode, name, &qstr);
+}
+
+static int ext4_d_hash(const struct dentry *dentry, struct qstr *str)
+{
+ const struct ext4_sb_info *sbi = EXT4_SB(dentry->d_sb);
+ const struct unicode_map *um = sbi->s_encoding;
+ unsigned char *norm;
+ int len, ret = 0;
+
+ if (!IS_CASEFOLDED(dentry->d_inode))
+ return 0;
+
+ norm = kmalloc(PATH_MAX, GFP_ATOMIC);
+ if (!norm)
+ return -ENOMEM;
+
+ len = utf8_casefold(um, str, norm, PATH_MAX);
+ if (len < 0) {
+ if (ext4_has_strict_mode(sbi))
+ ret = -EINVAL;
+ goto out;
+ }
+ str->hash = full_name_hash(dentry, norm, len);
+out:
+ kfree(norm);
+ return ret;
+}
+
+const struct dentry_operations ext4_dentry_ops = {
+ .d_hash = ext4_d_hash,
+ .d_compare = ext4_d_compare,
+};
+#endif
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index c1504c471fef..c18ab748d20d 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -399,10 +399,11 @@ struct flex_groups {
#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
#define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
+#define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded file */
#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
-#define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */
-#define EXT4_FL_USER_MODIFIABLE 0x204BC0FF /* User modifiable flags */
+#define EXT4_FL_USER_VISIBLE 0x704BDFFF /* User visible flags */
+#define EXT4_FL_USER_MODIFIABLE 0x604BC0FF /* User modifiable flags */
/* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
#define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
@@ -417,10 +418,10 @@ struct flex_groups {
EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
- EXT4_PROJINHERIT_FL)
+ EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL)
/* Flags that are appropriate for regular files (all but dir-specific ones). */
-#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
+#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL))
/* Flags that are appropriate for non-directories/regular files. */
#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
@@ -2393,8 +2394,8 @@ extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
/* hash.c */
-extern int ext4fs_dirhash(const char *name, int len, struct
- dx_hash_info *hinfo);
+extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
+ struct dx_hash_info *hinfo);
/* ialloc.c */
extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
@@ -2990,6 +2991,10 @@ static inline void ext4_unlock_group(struct super_block *sb,
/* dir.c */
extern const struct file_operations ext4_dir_operations;
+#ifdef CONFIG_UNICODE
+extern const struct dentry_operations ext4_dentry_ops;
+#endif
+
/* file.c */
extern const struct inode_operations ext4_file_inode_operations;
extern const struct file_operations ext4_file_operations;
@@ -3082,6 +3087,10 @@ extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
extern int ext4_handle_dirty_dirent_node(handle_t *handle,
struct inode *inode,
struct buffer_head *bh);
+extern int ext4_ci_compare(const struct inode *parent,
+ const struct qstr *name,
+ const struct qstr *entry);
+
#define S_SHIFT 12
static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
[S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
diff --git a/fs/ext4/hash.c b/fs/ext4/hash.c
index 46b24da33a28..d358bfcb6b3f 100644
--- a/fs/ext4/hash.c
+++ b/fs/ext4/hash.c
@@ -6,6 +6,7 @@
*/
#include <linux/fs.h>
+#include <linux/unicode.h>
#include <linux/compiler.h>
#include <linux/bitops.h>
#include "ext4.h"
@@ -196,7 +197,8 @@ static void str2hashbuf_unsigned(const char *msg, int len, __u32 *buf, int num)
* represented, and whether or not the returned hash is 32 bits or 64
* bits. 32 bit hashes will return 0 for the minor hash.
*/
-int ext4fs_dirhash(const char *name, int len, struct dx_hash_info *hinfo)
+static int __ext4fs_dirhash(const char *name, int len,
+ struct dx_hash_info *hinfo)
{
__u32 hash;
__u32 minor_hash = 0;
@@ -268,3 +270,33 @@ int ext4fs_dirhash(const char *name, int len, struct dx_hash_info *hinfo)
hinfo->minor_hash = minor_hash;
return 0;
}
+
+int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
+ struct dx_hash_info *hinfo)
+{
+#ifdef CONFIG_UNICODE
+ const struct unicode_map *um = EXT4_SB(dir->i_sb)->s_encoding;
+ int r, dlen;
+ unsigned char *buff;
+ struct qstr qstr = {.name = name, .len = len };
+
+ if (len && IS_CASEFOLDED(dir)) {
+ buff = kzalloc(sizeof(char) * PATH_MAX, GFP_KERNEL);
+ if (!buff)
+ return -ENOMEM;
+
+ dlen = utf8_casefold(um, &qstr, buff, PATH_MAX);
+ if (dlen < 0) {
+ kfree(buff);
+ goto opaque_seq;
+ }
+
+ r = __ext4fs_dirhash(buff, dlen, hinfo);
+
+ kfree(buff);
+ return r;
+ }
+opaque_seq:
+#endif
+ return __ext4fs_dirhash(name, len, hinfo);
+}
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index f3e17a8c84b4..764ff4c56233 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -455,7 +455,7 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
if (qstr) {
hinfo.hash_version = DX_HASH_HALF_MD4;
hinfo.seed = sbi->s_hash_seed;
- ext4fs_dirhash(qstr->name, qstr->len, &hinfo);
+ ext4fs_dirhash(parent, qstr->name, qstr->len, &hinfo);
grp = hinfo.hash;
} else
grp = prandom_u32();
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index 56f6e1782d5f..f73bc3925282 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -1407,7 +1407,7 @@ int htree_inlinedir_to_tree(struct file *dir_file,
}
}
- ext4fs_dirhash(de->name, de->name_len, hinfo);
+ ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
if ((hinfo->hash < start_hash) ||
((hinfo->hash == start_hash) &&
(hinfo->minor_hash < start_minor_hash)))
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 609c8366d029..82298c63ea6d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4742,9 +4742,11 @@ void ext4_set_inode_flags(struct inode *inode)
new_fl |= S_DAX;
if (flags & EXT4_ENCRYPT_FL)
new_fl |= S_ENCRYPTED;
+ if (flags & EXT4_CASEFOLD_FL)
+ new_fl |= S_CASEFOLD;
inode_set_flags(inode, new_fl,
S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_DAX|
- S_ENCRYPTED);
+ S_ENCRYPTED|S_CASEFOLD);
}
static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 20faa6a69238..7e85ecf0b849 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -278,6 +278,7 @@ static int ext4_ioctl_setflags(struct inode *inode,
struct ext4_iloc iloc;
unsigned int oldflags, mask, i;
unsigned int jflag;
+ struct super_block *sb = inode->i_sb;
/* Is it quota file? Do not allow user to mess with it */
if (ext4_is_quota_file(inode))
@@ -322,6 +323,23 @@ static int ext4_ioctl_setflags(struct inode *inode,
goto flags_out;
}
+ if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
+ if (!ext4_has_feature_casefold(sb)) {
+ err = -EOPNOTSUPP;
+ goto flags_out;
+ }
+
+ if (!S_ISDIR(inode->i_mode)) {
+ err = -ENOTDIR;
+ goto flags_out;
+ }
+
+ if (!ext4_empty_dir(inode)) {
+ err = -ENOTEMPTY;
+ goto flags_out;
+ }
+ }
+
handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
if (IS_ERR(handle)) {
err = PTR_ERR(handle);
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 980166a8122a..e917830eae84 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -35,6 +35,7 @@
#include <linux/buffer_head.h>
#include <linux/bio.h>
#include <linux/iversion.h>
+#include <linux/unicode.h>
#include "ext4.h"
#include "ext4_jbd2.h"
@@ -629,7 +630,7 @@ static struct stats dx_show_leaf(struct inode *dir,
}
if (!fscrypt_has_encryption_key(dir)) {
/* Directory is not encrypted */
- ext4fs_dirhash(de->name,
+ ext4fs_dirhash(dir, de->name,
de->name_len, &h);
printk("%*.s:(U)%x.%u ", len,
name, h.hash,
@@ -662,8 +663,8 @@ static struct stats dx_show_leaf(struct inode *dir,
name = fname_crypto_str.name;
len = fname_crypto_str.len;
}
- ext4fs_dirhash(de->name, de->name_len,
- &h);
+ ext4fs_dirhash(dir, de->name,
+ de->name_len, &h);
printk("%*.s:(E)%x.%u ", len, name,
h.hash, (unsigned) ((char *) de
- base));
@@ -673,7 +674,7 @@ static struct stats dx_show_leaf(struct inode *dir,
#else
int len = de->name_len;
char *name = de->name;
- ext4fs_dirhash(de->name, de->name_len, &h);
+ ext4fs_dirhash(dir, de->name, de->name_len, &h);
printk("%*.s:%x.%u ", len, name, h.hash,
(unsigned) ((char *) de - base));
#endif
@@ -762,7 +763,7 @@ dx_probe(struct ext4_filename *fname, struct inode *dir,
hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed;
if (fname && fname_name(fname))
- ext4fs_dirhash(fname_name(fname), fname_len(fname), hinfo);
+ ext4fs_dirhash(dir, fname_name(fname), fname_len(fname), hinfo);
hash = hinfo->hash;
if (root->info.unused_flags & 1) {
@@ -1008,7 +1009,7 @@ static int htree_dirblock_to_tree(struct file *dir_file,
/* silently ignore the rest of the block */
break;
}
- ext4fs_dirhash(de->name, de->name_len, hinfo);
+ ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
if ((hinfo->hash < start_hash) ||
((hinfo->hash == start_hash) &&
(hinfo->minor_hash < start_minor_hash)))
@@ -1197,7 +1198,7 @@ static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
while ((char *) de < base + blocksize) {
if (de->name_len && de->inode) {
- ext4fs_dirhash(de->name, de->name_len, &h);
+ ext4fs_dirhash(dir, de->name, de->name_len, &h);
map_tail--;
map_tail->hash = h.hash;
map_tail->offs = ((char *) de - base)>>2;
@@ -1252,15 +1253,52 @@ static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block)
dx_set_count(entries, count + 1);
}
+#ifdef CONFIG_UNICODE
+/*
+ * Test whether a case-insensitive directory entry matches the filename
+ * being searched for.
+ *
+ * Returns: 0 if the directory entry matches, more than 0 if it
+ * doesn't match or less than zero on error.
+ */
+int ext4_ci_compare(const struct inode *parent, const struct qstr *name,
+ const struct qstr *entry)
+{
+ const struct ext4_sb_info *sbi = EXT4_SB(parent->i_sb);
+ const struct unicode_map *um = sbi->s_encoding;
+ int ret;
+
+ ret = utf8_strncasecmp(um, name, entry);
+ if (ret < 0) {
+ /* Handle invalid character sequence as either an error
+ * or as an opaque byte sequence.
+ */
+ if (ext4_has_strict_mode(sbi))
+ return -EINVAL;
+
+ if (name->len != entry->len)
+ return 1;
+
+ return !!memcmp(name->name, entry->name, name->len);
+ }
+
+ return ret;
+}
+#endif
+
/*
* Test whether a directory entry matches the filename being searched for.
*
* Return: %true if the directory entry matches, otherwise %false.
*/
-static inline bool ext4_match(const struct ext4_filename *fname,
+static inline bool ext4_match(const struct inode *parent,
+ const struct ext4_filename *fname,
const struct ext4_dir_entry_2 *de)
{
struct fscrypt_name f;
+#ifdef CONFIG_UNICODE
+ const struct qstr entry = {.name = de->name, .len = de->name_len};
+#endif
if (!de->inode)
return false;
@@ -1270,6 +1308,12 @@ static inline bool ext4_match(const struct ext4_filename *fname,
#ifdef CONFIG_FS_ENCRYPTION
f.crypto_buf = fname->crypto_buf;
#endif
+
+#ifdef CONFIG_UNICODE
+ if (EXT4_SB(parent->i_sb)->s_encoding && IS_CASEFOLDED(parent))
+ return (ext4_ci_compare(parent, fname->usr_fname, &entry) == 0);
+#endif
+
return fscrypt_match_name(&f, de->name, de->name_len);
}
@@ -1290,7 +1334,7 @@ int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size,
/* this code is executed quadratically often */
/* do minimal checking `by hand' */
if ((char *) de + de->name_len <= dlimit &&
- ext4_match(fname, de)) {
+ ext4_match(dir, fname, de)) {
/* found a match - just to be sure, do
* a full check */
if (ext4_check_dir_entry(dir, NULL, de, bh, bh->b_data,
@@ -1588,6 +1632,17 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
return ERR_PTR(-EPERM);
}
}
+
+#ifdef CONFIG_UNICODE
+ if (!inode && IS_CASEFOLDED(dir)) {
+ /* Eventually we want to call d_add_ci(dentry, NULL)
+ * for negative dentries in the encoding case as
+ * well. For now, prevent the negative dentry
+ * from being cached.
+ */
+ return NULL;
+ }
+#endif
return d_splice_alias(inode, dentry);
}
@@ -1798,7 +1853,7 @@ int ext4_find_dest_de(struct inode *dir, struct inode *inode,
if (ext4_check_dir_entry(dir, NULL, de, bh,
buf, buf_size, offset))
return -EFSCORRUPTED;
- if (ext4_match(fname, de))
+ if (ext4_match(dir, fname, de))
return -EEXIST;
nlen = EXT4_DIR_REC_LEN(de->name_len);
rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
@@ -1983,7 +2038,7 @@ static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
if (fname->hinfo.hash_version <= DX_HASH_TEA)
fname->hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
fname->hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
- ext4fs_dirhash(fname_name(fname), fname_len(fname), &fname->hinfo);
+ ext4fs_dirhash(dir, fname_name(fname), fname_len(fname), &fname->hinfo);
memset(frames, 0, sizeof(frames));
frame = frames;
@@ -2036,6 +2091,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
struct ext4_dir_entry_2 *de;
struct ext4_dir_entry_tail *t;
struct super_block *sb;
+ struct ext4_sb_info *sbi;
struct ext4_filename fname;
int retval;
int dx_fallback=0;
@@ -2047,10 +2103,17 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
csum_size = sizeof(struct ext4_dir_entry_tail);
sb = dir->i_sb;
+ sbi = EXT4_SB(sb);
blocksize = sb->s_blocksize;
if (!dentry->d_name.len)
return -EINVAL;
+#ifdef CONFIG_UNICODE
+ if (ext4_has_strict_mode(sbi) && IS_CASEFOLDED(dir) &&
+ utf8_validate(sbi->s_encoding, &dentry->d_name))
+ return -EINVAL;
+#endif
+
retval = ext4_fname_setup_filename(dir, &dentry->d_name, 0, &fname);
if (retval)
return retval;
@@ -2975,6 +3038,17 @@ static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
ext4_update_dx_flag(dir);
ext4_mark_inode_dirty(handle, dir);
+#ifdef CONFIG_UNICODE
+ /* VFS negative dentries are incompatible with Encoding and
+ * Case-insensitiveness. Eventually we'll want avoid
+ * invalidating the dentries here, alongside with returning the
+ * negative dentries at ext4_lookup(), when it is better
+ * supported by the VFS for the CI case.
+ */
+ if (IS_CASEFOLDED(dir))
+ d_invalidate(dentry);
+#endif
+
end_rmdir:
brelse(bh);
if (handle)
@@ -3044,6 +3118,17 @@ static int ext4_unlink(struct inode *dir, struct dentry *dentry)
inode->i_ctime = current_time(inode);
ext4_mark_inode_dirty(handle, inode);
+#ifdef CONFIG_UNICODE
+ /* VFS negative dentries are incompatible with Encoding and
+ * Case-insensitiveness. Eventually we'll want avoid
+ * invalidating the dentries here, alongside with returning the
+ * negative dentries at ext4_lookup(), when it is better
+ * supported by the VFS for the CI case.
+ */
+ if (IS_CASEFOLDED(dir))
+ d_invalidate(dentry);
+#endif
+
end_unlink:
brelse(bh);
if (handle)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index c1b02c3a5a68..aeb6d22ea0ad 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4484,6 +4484,12 @@ no_journal:
iput(root);
goto failed_mount4;
}
+
+#ifdef CONFIG_UNICODE
+ if (sbi->s_encoding)
+ sb->s_d_op = &ext4_dentry_ops;
+#endif
+
sb->s_root = d_make_root(root);
if (!sb->s_root) {
ext4_msg(sb, KERN_ERR, "get root dentry failed");
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 8b42df09b04c..6261090e605b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1953,6 +1953,7 @@ struct super_operations {
#define S_DAX 0 /* Make all the DAX code disappear */
#endif
#define S_ENCRYPTED 16384 /* Encrypted file (using fs/crypto/) */
+#define S_CASEFOLD 32768 /* Casefolded file */
/*
* Note that nosuid etc flags are inode-specific: setting some file-system
@@ -1993,6 +1994,7 @@ static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags
#define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
#define IS_DAX(inode) ((inode)->i_flags & S_DAX)
#define IS_ENCRYPTED(inode) ((inode)->i_flags & S_ENCRYPTED)
+#define IS_CASEFOLDED(inode) ((inode)->i_flags & S_CASEFOLD)
#define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \
(inode)->i_rdev == WHITEOUT_DEV)
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-04 10:10:01 +0000