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SubjectRe: [PATCH 2/2] f2fs: expose extension_list sysfs entry
On 02/11, Chao Yu wrote:
> From: Chao Yu <yuchao0@huawei.com>
>
> This patch adds a sysfs entry 'extension_list' to support lookup/
> add/delete item in extension list.

Hi Chao,

We need Doc change as well.

Thanks,

>
> Lookup:
> cat /sys/fs/f2fs/<device>/extentsion_list
>
> Add:
> echo 'extension' > /sys/fs/f2fs/<device>/extentsion_list
>
> Delete:
> echo '!extension' > /sys/fs/f2fs/<device>/extentsion_list
>
> Signed-off-by: Chao Yu <yuchao0@huawei.com>
> ---
> fs/f2fs/f2fs.h | 4 +++-
> fs/f2fs/file.c | 4 ++--
> fs/f2fs/namei.c | 42 +++++++++++++++++++++++++++++++++++++++---
> fs/f2fs/super.c | 2 +-
> fs/f2fs/sysfs.c | 40 ++++++++++++++++++++++++++++++++++++++++
> include/linux/f2fs_fs.h | 3 ++-
> 6 files changed, 87 insertions(+), 8 deletions(-)
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 0332c44a1d93..030436be2a35 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1048,7 +1048,7 @@ struct f2fs_sb_info {
> struct super_block *sb; /* pointer to VFS super block */
> struct proc_dir_entry *s_proc; /* proc entry */
> struct f2fs_super_block *raw_super; /* raw super block pointer */
> - struct mutex sb_lock; /* lock for raw super block */
> + struct rw_semaphore sb_lock; /* lock for raw super block */
> int valid_super_block; /* valid super block no */
> unsigned long s_flag; /* flags for sbi */
>
> @@ -2612,6 +2612,8 @@ void handle_failed_inode(struct inode *inode);
> /*
> * namei.c
> */
> +int update_extension_list(struct f2fs_sb_info *sbi, const char *name,
> + bool set);
> struct dentry *f2fs_get_parent(struct dentry *child);
>
> /*
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index f26a0bd17469..f64bcd0a7f73 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -1969,7 +1969,7 @@ static int f2fs_ioc_get_encryption_pwsalt(struct file *filp, unsigned long arg)
> if (err)
> return err;
>
> - mutex_lock(&sbi->sb_lock);
> + down_write(&sbi->sb_lock);
>
> if (uuid_is_nonzero(sbi->raw_super->encrypt_pw_salt))
> goto got_it;
> @@ -1988,7 +1988,7 @@ static int f2fs_ioc_get_encryption_pwsalt(struct file *filp, unsigned long arg)
> 16))
> err = -EFAULT;
> out_err:
> - mutex_unlock(&sbi->sb_lock);
> + up_write(&sbi->sb_lock);
> mnt_drop_write_file(filp);
> return err;
> }
> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> index c4c94c7e9f4f..fa8e5c06ba39 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;
> +
> + 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,
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 1b49ad477dd9..9b17355434f6 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -2233,7 +2233,7 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
> sbi->dirty_device = 0;
> spin_lock_init(&sbi->dev_lock);
>
> - mutex_init(&sbi->sb_lock);
> + init_rwsem(&sbi->sb_lock);
> }
>
> static int init_percpu_info(struct f2fs_sb_info *sbi)
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index 374ee5c82f94..d27b28e602a6 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -136,6 +136,18 @@ static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
> if (!ptr)
> return -EINVAL;
>
> + if (!strcmp(a->attr.name, "extension_list")) {
> + __u8 (*extlist)[F2FS_EXTENSION_LEN] =
> + sbi->raw_super->extension_list;
> + int count = le32_to_cpu(sbi->raw_super->extension_count);
> + int len = 0, i;
> +
> + for (i = 0; i < count; i++)
> + len += snprintf(buf + len, PAGE_SIZE - len, "%s\n",
> + extlist[i]);
> + return len;
> + }
> +
> ui = (unsigned int *)(ptr + a->offset);
>
> return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
> @@ -154,6 +166,32 @@ static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
> if (!ptr)
> return -EINVAL;
>
> + if (!strcmp(a->attr.name, "extension_list")) {
> + const char *name = strim((char *)buf);
> + bool set = true;
> +
> + if (name[0] == '!') {
> + name++;
> + set = false;
> + }
> +
> + if (strlen(name) >= F2FS_EXTENSION_LEN)
> + return -EINVAL;
> +
> + down_write(&sbi->sb_lock);
> +
> + ret = update_extension_list(sbi, name, set);
> + if (ret)
> + goto out;
> +
> + ret = f2fs_commit_super(sbi, false);
> + if (ret)
> + update_extension_list(sbi, name, !set);
> +out:
> + up_write(&sbi->sb_lock);
> + return ret ? ret : count;
> + }
> +
> ui = (unsigned int *)(ptr + a->offset);
>
> ret = kstrtoul(skip_spaces(buf), 0, &t);
> @@ -307,6 +345,7 @@ F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_enable, iostat_enable);
> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, readdir_ra, readdir_ra);
> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_pin_file_thresh, gc_pin_file_threshold);
> +F2FS_RW_ATTR(F2FS_SBI, f2fs_super_block, extension_list, extension_list);
> #ifdef CONFIG_F2FS_FAULT_INJECTION
> F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
> F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
> @@ -357,6 +396,7 @@ static struct attribute *f2fs_attrs[] = {
> ATTR_LIST(iostat_enable),
> ATTR_LIST(readdir_ra),
> ATTR_LIST(gc_pin_file_thresh),
> + ATTR_LIST(extension_list),
> #ifdef CONFIG_F2FS_FAULT_INJECTION
> ATTR_LIST(inject_rate),
> ATTR_LIST(inject_type),
> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
> index f7f09907e69d..3d03f51282ac 100644
> --- a/include/linux/f2fs_fs.h
> +++ b/include/linux/f2fs_fs.h
> @@ -21,6 +21,7 @@
> #define F2FS_BLKSIZE 4096 /* support only 4KB block */
> #define F2FS_BLKSIZE_BITS 12 /* bits for F2FS_BLKSIZE */
> #define F2FS_MAX_EXTENSION 64 /* # of extension entries */
> +#define F2FS_EXTENSION_LEN 8 /* max size of extension */
> #define F2FS_BLK_ALIGN(x) (((x) + F2FS_BLKSIZE - 1) >> F2FS_BLKSIZE_BITS)
>
> #define NULL_ADDR ((block_t)0) /* used as block_t addresses */
> @@ -102,7 +103,7 @@ struct f2fs_super_block {
> __u8 uuid[16]; /* 128-bit uuid for volume */
> __le16 volume_name[MAX_VOLUME_NAME]; /* volume name */
> __le32 extension_count; /* # of extensions below */
> - __u8 extension_list[F2FS_MAX_EXTENSION][8]; /* extension array */
> + __u8 extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */
> __le32 cp_payload;
> __u8 version[VERSION_LEN]; /* the kernel version */
> __u8 init_version[VERSION_LEN]; /* the initial kernel version */
> --
> 2.14.1.145.gb3622a4ee

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