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f2fs: expose extension_list sysfs entry

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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>
This commit is contained in:
Chao Yu
2018-02-26 22:04:13 +08:00
committed by Jaegeuk Kim
parent 17cd07ae95
commit 846ae671ad
7 changed files with 96 additions and 8 deletions
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42
fs/f2fs/namei.c
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@@ -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;
down_read(&sbi->sb_lock);
count = le32_to_cpu(sbi->raw_super->extension_count);
int 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,