From: Gabriel Krisman Bertazi Subject: [PATCH RFC 10/13] ext4: Include encoding information on the superblock Date: Fri, 12 Jan 2018 05:12:31 -0200 Message-ID: <20180112071234.29470-11-krisman@collabora.co.uk> References: <20180112071234.29470-1-krisman@collabora.co.uk> Cc: linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, kernel@lists.collabora.co.uk, alvaro.soliverez@collabora.co.uk, Gabriel Krisman Bertazi To: tytso@mit.edu, david@fromorbit.com, bpm@sgi.com, olaf@sgi.com Return-path: In-Reply-To: <20180112071234.29470-1-krisman@collabora.co.uk> Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org Signed-off-by: Gabriel Krisman Bertazi --- fs/ext4/ext4.h | 1 + fs/ext4/super.c | 27 ++++++++++++++++++++++++++- 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 09fb2426c352..6c8aaf2dd322 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1369,6 +1369,7 @@ struct ext4_sb_info { struct kobject s_kobj; struct completion s_kobj_unregister; struct super_block *s_sb; + const struct charset *encoding; /* Journaling */ struct journal_s *s_journal; diff --git a/fs/ext4/super.c b/fs/ext4/super.c index f737e90a3b4e..022bf5f274b2 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -40,6 +40,7 @@ #include #include #include +#include #include #include @@ -1350,7 +1351,7 @@ enum { Opt_dioread_nolock, Opt_dioread_lock, Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache, - Opt_ignore_case, + Opt_ignore_case, Opt_encoding, }; static const match_table_t tokens = { @@ -1434,6 +1435,7 @@ static const match_table_t tokens = { {Opt_max_dir_size_kb, "max_dir_size_kb=%u"}, {Opt_test_dummy_encryption, "test_dummy_encryption"}, {Opt_ignore_case, "ignorecase"}, + {Opt_encoding, "encoding=%s"}, {Opt_nombcache, "nombcache"}, {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */ {Opt_removed, "check=none"}, /* mount option from ext2/3 */ @@ -1644,6 +1646,7 @@ static const struct mount_opts { {Opt_max_dir_size_kb, 0, MOPT_GTE0}, {Opt_test_dummy_encryption, 0, MOPT_GTE0}, {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET}, + {Opt_encoding, 0, MOPT_EXT4_ONLY | MOPT_STRING}, {Opt_err, 0, 0} }; @@ -1882,6 +1885,16 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, sbi->s_mount_opt |= m->mount_opt; } else if (token == Opt_data_err_ignore) { sbi->s_mount_opt &= ~m->mount_opt; + } else if (token == Opt_encoding) { + char *charset = match_strdup(&args[0]); + + sbi->encoding = charset_load(charset); + if (!sbi->encoding) { + ext4_msg(sb, KERN_ERR, "Encoding %s not supported\n", + charset); + return -1; + } + kfree(charset); } else { if (!args->from) arg = 1; @@ -1968,6 +1981,12 @@ static int parse_options(char *options, struct super_block *sb, return 0; } } + + if (test_opt2(sb, CASE_INSENSITIVE) && !sbi->encoding) { + ext4_msg(sb, KERN_WARNING, "Encoding not explicitly specified " + "or identified on the superblock. ASCII is assumed."); + } + return 1; } @@ -3598,6 +3617,12 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) &journal_ioprio, 0)) goto failed_mount; + if (!sbi->encoding) { + sbi->encoding = charset_load("ascii"); + if (!sbi->encoding) + goto failed_mount; + } + if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { printk_once(KERN_WARNING "EXT4-fs: Warning: mounting " "with data=journal disables delayed " -- 2.15.1