diff options
| -rw-r--r-- | fs/ext4/ext4.h | 21 | ||||
| -rw-r--r-- | fs/ext4/super.c | 85 |
2 files changed, 105 insertions, 1 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 2a2e6ed9aab4..c1504c471fef 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1313,7 +1313,9 @@ struct ext4_super_block { __u8 s_first_error_time_hi; __u8 s_last_error_time_hi; __u8 s_pad[2]; - __le32 s_reserved[96]; /* Padding to the end of the block */ + __le16 s_encoding; /* Filename charset encoding */ + __le16 s_encoding_flags; /* Filename charset encoding flags */ + __le32 s_reserved[95]; /* Padding to the end of the block */ __le32 s_checksum; /* crc32c(superblock) */ }; @@ -1338,6 +1340,16 @@ struct ext4_super_block { /* Number of quota types we support */ #define EXT4_MAXQUOTAS 3 +#define EXT4_ENC_UTF8_12_1 1 + +/* + * Flags for ext4_sb_info.s_encoding_flags. + */ +#define EXT4_ENC_STRICT_MODE_FL (1 << 0) + +#define ext4_has_strict_mode(sbi) \ + (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL) + /* * fourth extended-fs super-block data in memory */ @@ -1387,6 +1399,10 @@ struct ext4_sb_info { struct kobject s_kobj; struct completion s_kobj_unregister; struct super_block *s_sb; +#ifdef CONFIG_UNICODE + struct unicode_map *s_encoding; + __u16 s_encoding_flags; +#endif /* Journaling */ struct journal_s *s_journal; @@ -1660,6 +1676,7 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 +#define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 extern void ext4_update_dynamic_rev(struct super_block *sb); @@ -1753,6 +1770,7 @@ EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) +EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ @@ -1780,6 +1798,7 @@ EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) EXT4_FEATURE_INCOMPAT_MMP | \ EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ EXT4_FEATURE_INCOMPAT_ENCRYPT | \ + EXT4_FEATURE_INCOMPAT_CASEFOLD | \ EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ EXT4_FEATURE_INCOMPAT_LARGEDIR) #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 184944d4d8d1..c1b02c3a5a68 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -42,6 +42,7 @@ #include <linux/cleancache.h> #include <linux/uaccess.h> #include <linux/iversion.h> +#include <linux/unicode.h> #include <linux/kthread.h> #include <linux/freezer.h> @@ -1054,6 +1055,9 @@ static void ext4_put_super(struct super_block *sb) crypto_free_shash(sbi->s_chksum_driver); kfree(sbi->s_blockgroup_lock); fs_put_dax(sbi->s_daxdev); +#ifdef CONFIG_UNICODE + utf8_unload(sbi->s_encoding); +#endif kfree(sbi); } @@ -1750,6 +1754,36 @@ static const struct mount_opts { {Opt_err, 0, 0} }; +#ifdef CONFIG_UNICODE +static const struct ext4_sb_encodings { + __u16 magic; + char *name; + char *version; +} ext4_sb_encoding_map[] = { + {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"}, +}; + +static int ext4_sb_read_encoding(const struct ext4_super_block *es, + const struct ext4_sb_encodings **encoding, + __u16 *flags) +{ + __u16 magic = le16_to_cpu(es->s_encoding); + int i; + + for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++) + if (magic == ext4_sb_encoding_map[i].magic) + break; + + if (i >= ARRAY_SIZE(ext4_sb_encoding_map)) + return -EINVAL; + + *encoding = &ext4_sb_encoding_map[i]; + *flags = le16_to_cpu(es->s_encoding_flags); + + return 0; +} +#endif + static int handle_mount_opt(struct super_block *sb, char *opt, int token, substring_t *args, unsigned long *journal_devnum, unsigned int *journal_ioprio, int is_remount) @@ -2880,6 +2914,15 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly) return 0; } +#ifndef CONFIG_UNICODE + if (ext4_has_feature_casefold(sb)) { + ext4_msg(sb, KERN_ERR, + "Filesystem with casefold feature cannot be " + "mounted without CONFIG_UNICODE"); + return 0; + } +#endif + if (readonly) return 1; @@ -3770,6 +3813,43 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) &journal_ioprio, 0)) goto failed_mount; +#ifdef CONFIG_UNICODE + if (ext4_has_feature_casefold(sb) && !sbi->s_encoding) { + const struct ext4_sb_encodings *encoding_info; + struct unicode_map *encoding; + __u16 encoding_flags; + + if (ext4_has_feature_encrypt(sb)) { + ext4_msg(sb, KERN_ERR, + "Can't mount with encoding and encryption"); + goto failed_mount; + } + + if (ext4_sb_read_encoding(es, &encoding_info, + &encoding_flags)) { + ext4_msg(sb, KERN_ERR, + "Encoding requested by superblock is unknown"); + goto failed_mount; + } + + encoding = utf8_load(encoding_info->version); + if (IS_ERR(encoding)) { + ext4_msg(sb, KERN_ERR, + "can't mount with superblock charset: %s-%s " + "not supported by the kernel. flags: 0x%x.", + encoding_info->name, encoding_info->version, + encoding_flags); + goto failed_mount; + } + ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: " + "%s-%s with flags 0x%hx", encoding_info->name, + encoding_info->version?:"\b", encoding_flags); + + sbi->s_encoding = encoding; + sbi->s_encoding_flags = encoding_flags; + } +#endif + if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { printk_once(KERN_WARNING "EXT4-fs: Warning: mounting " "with data=journal disables delayed " @@ -4586,6 +4666,11 @@ failed_mount2: failed_mount: if (sbi->s_chksum_driver) crypto_free_shash(sbi->s_chksum_driver); + +#ifdef CONFIG_UNICODE + utf8_unload(sbi->s_encoding); +#endif + #ifdef CONFIG_QUOTA for (i = 0; i < EXT4_MAXQUOTAS; i++) kfree(sbi->s_qf_names[i]); |