f2fs: expose extension_list sysfs entry
This patch adds a sysfs entry 'extension_list' to support
query/add/del item in extension list.
Query:
cat /sys/fs/f2fs/<device>/extension_list
Add:
echo 'extension' > /sys/fs/f2fs/<device>/extension_list
Del:
echo '!extension' > /sys/fs/f2fs/<device>/extension_list
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 2ebf3d0..2bd6e9f 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -171,16 +171,52 @@ static int is_multimedia_file(const unsigned char *s, const char *sub)
static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
const unsigned char *name)
{
- int i;
- __u8 (*extlist)[8] = sbi->raw_super->extension_list;
+ __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
+ int i, count;
- int count = le32_to_cpu(sbi->raw_super->extension_count);
+ down_read(&sbi->sb_lock);
+
+ count = le32_to_cpu(sbi->raw_super->extension_count);
+
for (i = 0; i < count; i++) {
if (is_multimedia_file(name, extlist[i])) {
file_set_cold(inode);
break;
}
}
+
+ up_read(&sbi->sb_lock);
+}
+
+int update_extension_list(struct f2fs_sb_info *sbi, const char *name, bool set)
+{
+ __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
+ int count = le32_to_cpu(sbi->raw_super->extension_count);
+ int i;
+
+ for (i = 0; i < count; i++) {
+ if (strcmp(name, extlist[i]))
+ continue;
+
+ if (set)
+ return -EINVAL;
+
+ memcpy(extlist[i], extlist[i + 1],
+ F2FS_EXTENSION_LEN * (count - i - 1));
+ memset(extlist[count - 1], 0, F2FS_EXTENSION_LEN);
+ sbi->raw_super->extension_count = cpu_to_le32(count - 1);
+ return 0;
+ }
+
+ if (!set)
+ return -EINVAL;
+
+ if (count == F2FS_MAX_EXTENSION)
+ return -EINVAL;
+
+ strncpy(extlist[count], name, strlen(name));
+ sbi->raw_super->extension_count = cpu_to_le32(count + 1);
+ return 0;
}
static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
