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FROMLIST: Add standard casefolding support

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This adds general supporting functions for filesystems that use
utf8 casefolding. It provides standard dentry_operations and adds the
necessary structures in struct super_block to allow this standardization.

Ext4 and F2fs are switch to these implementations.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Note: Fixed issue with non-strictly enforced fallback hash
Test: Boots, /data/media is case insensitive
Bug: 138322712
Link: https://lore.kernel.org/linux-f2fs-devel/20200208013552.241832-1-drosen@google.com/T/#t
Change-Id: I81b5fb5d3ce0259a60712ae2505c1e4b03dbafde
This commit is contained in:
Daniel Rosenberg
2020-01-22 20:05:18 -08:00
parent 73f57a0926
commit 6e29e14f38
2 changed files with 83 additions and 0 deletions
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22
include/linux/fs.h
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@@ -1333,6 +1333,12 @@ extern int send_sigurg(struct fown_struct *fown);
#define SB_ACTIVE (1<<30)
#define SB_NOUSER (1<<31)
/* These flags relate to encoding and casefolding */
#define SB_ENC_STRICT_MODE_FL (1 << 0)
#define sb_has_enc_strict_mode(sb) \
(sb->s_encoding_flags & SB_ENC_STRICT_MODE_FL)
/*
* Umount options
*/
@@ -1400,6 +1406,10 @@ struct super_block {
#endif
#ifdef CONFIG_FS_VERITY
const struct fsverity_operations *s_vop;
#endif
#ifdef CONFIG_UNICODE
struct unicode_map *s_encoding;
__u16 s_encoding_flags;
#endif
struct hlist_bl_head s_roots; /* alternate root dentries for NFS */
struct list_head s_mounts; /* list of mounts; _not_ for fs use */
@@ -3261,6 +3271,18 @@ extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
extern int generic_check_addressable(unsigned, u64);
#ifdef CONFIG_UNICODE
extern int generic_ci_d_hash(const struct dentry *dentry, struct qstr *str);
extern int generic_ci_d_compare(const struct dentry *dentry, unsigned int len,
const char *str, const struct qstr *name);
extern bool needs_casefold(const struct inode *dir);
#else
static inline bool needs_casefold(const struct inode *dir)
{
return 0;
}
#endif
#ifdef CONFIG_MIGRATION
extern int buffer_migrate_page(struct address_space *,
struct page *, struct page *,