linux-ext4 - [PATCH RFC v2 09/13] ext4: Add ignorecase mount option

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Date:   Thu, 25 Jan 2018 00:53:45 -0200
From:   Gabriel Krisman Bertazi <krisman@...labora.co.uk>
To:     tytso@....edu, david@...morbit.com, olaf@....com,
        viro@...iv.linux.org.uk
Cc:     linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        alvaro.soliverez@...labora.co.uk, kernel@...ts.collabora.co.uk,
        Gabriel Krisman Bertazi <krisman@...labora.co.uk>
Subject: [PATCH RFC v2 09/13] ext4: Add ignorecase mount option

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.co.uk>
---
 fs/ext4/ext4.h  | 3 +++
 fs/ext4/super.c | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 4e091eae38b1..09fb2426c352 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1130,6 +1130,9 @@ struct ext4_inode_info {
 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM	0x00000008 /* User explicitly
 						specified journal checksum */
 
+#define EXT4_MOUNT2_CASE_INSENSITIVE		0x00000010 /* Perform case-insensitive
+							      lookups */
+
 #define clear_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt &= \
 						~EXT4_MOUNT_##opt
 #define set_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt |= \
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 7c46693a14d7..f737e90a3b4e 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1350,6 +1350,7 @@ 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,
 };
 
 static const match_table_t tokens = {
@@ -1432,6 +1433,7 @@ static const match_table_t tokens = {
 	{Opt_noinit_itable, "noinit_itable"},
 	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
 	{Opt_test_dummy_encryption, "test_dummy_encryption"},
+	{Opt_ignore_case, "ignorecase"},
 	{Opt_nombcache, "nombcache"},
 	{Opt_nombcache, "no_mbcache"},	/* for backward compatibility */
 	{Opt_removed, "check=none"},	/* mount option from ext2/3 */
@@ -1687,6 +1689,9 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
 	case Opt_nolazytime:
 		sb->s_flags &= ~SB_LAZYTIME;
 		return 1;
+	case Opt_ignore_case:
+		set_opt2(sb, CASE_INSENSITIVE);
+		return 1;
 	}
 
 	for (m = ext4_mount_opts; m->token != Opt_err; m++)
-- 
2.15.1