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f2fs: add reserved blocks for root user

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This patch allows root to reserve some blocks via mount option.

"-o reserve_root=N" means N x 4KB-sized blocks for root only.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2017-12-27 15:05:52 -08:00
parent 2c1905042c
commit 7e65be49ed
3 changed files with 54 additions and 6 deletions
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20
fs/f2fs/f2fs.h
View File

@ -95,6 +95,7 @@ extern char *fault_name[FAULT_MAX];
#define F2FS_MOUNT_PRJQUOTA 0x00200000
#define F2FS_MOUNT_QUOTA 0x00400000
#define F2FS_MOUNT_INLINE_XATTR_SIZE 0x00800000
#define F2FS_MOUNT_RESERVE_ROOT 0x01000000
#define clear_opt(sbi, option) ((sbi)->mount_opt.opt &= ~F2FS_MOUNT_##option)
#define set_opt(sbi, option) ((sbi)->mount_opt.opt |= F2FS_MOUNT_##option)
@ -1105,6 +1106,7 @@ struct f2fs_sb_info {
block_t last_valid_block_count; /* for recovery */
block_t reserved_blocks; /* configurable reserved blocks */
block_t current_reserved_blocks; /* current reserved blocks */
block_t root_reserved_blocks; /* root reserved blocks */
unsigned int nquota_files; /* # of quota sysfile */
@ -1583,11 +1585,17 @@ static inline int inc_valid_block_count(struct f2fs_sb_info *sbi,
sbi->total_valid_block_count += (block_t)(*count);
avail_user_block_count = sbi->user_block_count -
sbi->current_reserved_blocks;
if (!(test_opt(sbi, RESERVE_ROOT) && capable(CAP_SYS_RESOURCE)))
avail_user_block_count -= sbi->root_reserved_blocks;
if (unlikely(sbi->total_valid_block_count > avail_user_block_count)) {
diff = sbi->total_valid_block_count - avail_user_block_count;
if (diff > *count)
diff = *count;
*count -= diff;
release = diff;
sbi->total_valid_block_count = avail_user_block_count;
sbi->total_valid_block_count -= diff;
if (!*count) {
spin_unlock(&sbi->stat_lock);
percpu_counter_sub(&sbi->alloc_valid_block_count, diff);
@ -1776,9 +1784,13 @@ static inline int inc_valid_node_count(struct f2fs_sb_info *sbi,
spin_lock(&sbi->stat_lock);
valid_block_count = sbi->total_valid_block_count + 1;
if (unlikely(valid_block_count + sbi->current_reserved_blocks >
sbi->user_block_count)) {
valid_block_count = sbi->total_valid_block_count +
sbi->current_reserved_blocks + 1;
if (!(test_opt(sbi, RESERVE_ROOT) && capable(CAP_SYS_RESOURCE)))
valid_block_count += sbi->root_reserved_blocks;
if (unlikely(valid_block_count > sbi->user_block_count)) {
spin_unlock(&sbi->stat_lock);
goto enospc;
}

37
fs/f2fs/super.c
View File

@ -107,6 +107,7 @@ enum {
Opt_noextent_cache,
Opt_noinline_data,
Opt_data_flush,
Opt_reserve_root,
Opt_mode,
Opt_io_size_bits,
Opt_fault_injection,
@ -157,6 +158,7 @@ static match_table_t f2fs_tokens = {
{Opt_noextent_cache, "noextent_cache"},
{Opt_noinline_data, "noinline_data"},
{Opt_data_flush, "data_flush"},
{Opt_reserve_root, "reserve_root=%u"},
{Opt_mode, "mode=%s"},
{Opt_io_size_bits, "io_bits=%u"},
{Opt_fault_injection, "fault_injection=%u"},
@ -191,6 +193,19 @@ void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
va_end(args);
}
static inline void limit_reserve_root(struct f2fs_sb_info *sbi)
{
block_t limit = (sbi->user_block_count << 1) / 1000;
/* limit is 0.2% */
if (test_opt(sbi, RESERVE_ROOT) && sbi->root_reserved_blocks > limit) {
sbi->root_reserved_blocks = limit;
f2fs_msg(sbi->sb, KERN_INFO,
"Reduce reserved blocks for root = %u",
sbi->root_reserved_blocks);
}
}
static void init_once(void *foo)
{
struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
@ -488,6 +503,18 @@ static int parse_options(struct super_block *sb, char *options)
case Opt_data_flush:
set_opt(sbi, DATA_FLUSH);
break;
case Opt_reserve_root:
if (args->from && match_int(args, &arg))
return -EINVAL;
if (test_opt(sbi, RESERVE_ROOT)) {
f2fs_msg(sb, KERN_INFO,
"Preserve previous reserve_root=%u",
sbi->root_reserved_blocks);
} else {
sbi->root_reserved_blocks = arg;
set_opt(sbi, RESERVE_ROOT);
}
break;
case Opt_mode:
name = match_strdup(&args[0]);
@ -1006,7 +1033,10 @@ static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_blocks = total_count - start_count;
buf->f_bfree = user_block_count - valid_user_blocks(sbi) -
sbi->current_reserved_blocks;
buf->f_bavail = buf->f_bfree;
if (buf->f_bfree > sbi->root_reserved_blocks)
buf->f_bavail = buf->f_bfree - sbi->root_reserved_blocks;
else
buf->f_bavail = 0;
avail_node_count = sbi->total_node_count - sbi->nquota_files -
F2FS_RESERVED_NODE_NUM;
@ -1135,6 +1165,9 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
else if (test_opt(sbi, LFS))
seq_puts(seq, "lfs");
seq_printf(seq, ",active_logs=%u", sbi->active_logs);
if (test_opt(sbi, RESERVE_ROOT))
seq_printf(seq, ",reserve_root=%u",
sbi->root_reserved_blocks);
if (F2FS_IO_SIZE_BITS(sbi))
seq_printf(seq, ",io_size=%uKB", F2FS_IO_SIZE_KB(sbi));
#ifdef CONFIG_F2FS_FAULT_INJECTION
@ -1333,6 +1366,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
(test_opt(sbi, POSIX_ACL) ? SB_POSIXACL : 0);
limit_reserve_root(sbi);
return 0;
restore_gc:
if (need_restart_gc) {
@ -2569,6 +2603,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
sbi->last_valid_block_count = sbi->total_valid_block_count;
sbi->reserved_blocks = 0;
sbi->current_reserved_blocks = 0;
limit_reserve_root(sbi);
for (i = 0; i < NR_INODE_TYPE; i++) {
INIT_LIST_HEAD(&sbi->inode_list[i]);

3
fs/f2fs/sysfs.c
View File

@ -162,7 +162,8 @@ static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
#endif
if (a->struct_type == RESERVED_BLOCKS) {
spin_lock(&sbi->stat_lock);
if (t > (unsigned long)sbi->user_block_count) {
if (t > (unsigned long)(sbi->user_block_count -
sbi->root_reserved_blocks)) {
spin_unlock(&sbi->stat_lock);
return -EINVAL;
}