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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 00:40:03 +00:00
![Jaegeuk Kim](/assets/img/avatar_default.png)
This reports performance regression by Yuanhan Liu.
The basic idea was to reduce one-point mutex, but it turns out this causes
another contention like context swithes.
https://lkml.org/lkml/2015/4/21/11
Until finishing the analysis on this issue, I'd like to revert this for a while.
This reverts commit 78373b7319
.
1350 lines
33 KiB
C
1350 lines
33 KiB
C
/*
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* fs/f2fs/super.c
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/statfs.h>
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#include <linux/buffer_head.h>
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#include <linux/backing-dev.h>
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#include <linux/kthread.h>
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#include <linux/parser.h>
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#include <linux/mount.h>
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#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#include <linux/random.h>
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#include <linux/exportfs.h>
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#include <linux/blkdev.h>
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#include <linux/f2fs_fs.h>
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#include <linux/sysfs.h>
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#include "f2fs.h"
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#include "node.h"
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#include "segment.h"
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#include "xattr.h"
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#include "gc.h"
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#include "trace.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/f2fs.h>
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static struct proc_dir_entry *f2fs_proc_root;
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static struct kmem_cache *f2fs_inode_cachep;
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static struct kset *f2fs_kset;
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enum {
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Opt_gc_background,
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Opt_disable_roll_forward,
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Opt_norecovery,
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Opt_discard,
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Opt_noheap,
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Opt_user_xattr,
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Opt_nouser_xattr,
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Opt_acl,
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Opt_noacl,
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Opt_active_logs,
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Opt_disable_ext_identify,
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Opt_inline_xattr,
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Opt_inline_data,
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Opt_inline_dentry,
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Opt_flush_merge,
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Opt_nobarrier,
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Opt_fastboot,
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Opt_extent_cache,
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Opt_noinline_data,
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Opt_err,
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};
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static match_table_t f2fs_tokens = {
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{Opt_gc_background, "background_gc=%s"},
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{Opt_disable_roll_forward, "disable_roll_forward"},
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{Opt_norecovery, "norecovery"},
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{Opt_discard, "discard"},
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{Opt_noheap, "no_heap"},
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{Opt_user_xattr, "user_xattr"},
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{Opt_nouser_xattr, "nouser_xattr"},
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{Opt_acl, "acl"},
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{Opt_noacl, "noacl"},
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{Opt_active_logs, "active_logs=%u"},
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{Opt_disable_ext_identify, "disable_ext_identify"},
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{Opt_inline_xattr, "inline_xattr"},
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{Opt_inline_data, "inline_data"},
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{Opt_inline_dentry, "inline_dentry"},
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{Opt_flush_merge, "flush_merge"},
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{Opt_nobarrier, "nobarrier"},
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{Opt_fastboot, "fastboot"},
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{Opt_extent_cache, "extent_cache"},
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{Opt_noinline_data, "noinline_data"},
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{Opt_err, NULL},
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};
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/* Sysfs support for f2fs */
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enum {
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GC_THREAD, /* struct f2fs_gc_thread */
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SM_INFO, /* struct f2fs_sm_info */
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NM_INFO, /* struct f2fs_nm_info */
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F2FS_SBI, /* struct f2fs_sb_info */
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};
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struct f2fs_attr {
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struct attribute attr;
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ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
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ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
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const char *, size_t);
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int struct_type;
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int offset;
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};
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static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
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{
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if (struct_type == GC_THREAD)
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return (unsigned char *)sbi->gc_thread;
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else if (struct_type == SM_INFO)
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return (unsigned char *)SM_I(sbi);
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else if (struct_type == NM_INFO)
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return (unsigned char *)NM_I(sbi);
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else if (struct_type == F2FS_SBI)
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return (unsigned char *)sbi;
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return NULL;
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}
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static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
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struct f2fs_sb_info *sbi, char *buf)
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{
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unsigned char *ptr = NULL;
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unsigned int *ui;
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ptr = __struct_ptr(sbi, a->struct_type);
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if (!ptr)
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return -EINVAL;
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ui = (unsigned int *)(ptr + a->offset);
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return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
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}
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static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
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struct f2fs_sb_info *sbi,
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const char *buf, size_t count)
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{
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unsigned char *ptr;
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unsigned long t;
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unsigned int *ui;
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ssize_t ret;
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ptr = __struct_ptr(sbi, a->struct_type);
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if (!ptr)
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return -EINVAL;
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ui = (unsigned int *)(ptr + a->offset);
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ret = kstrtoul(skip_spaces(buf), 0, &t);
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if (ret < 0)
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return ret;
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*ui = t;
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return count;
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}
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static ssize_t f2fs_attr_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
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s_kobj);
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struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
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return a->show ? a->show(a, sbi, buf) : 0;
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}
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static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t len)
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{
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struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
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s_kobj);
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struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
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return a->store ? a->store(a, sbi, buf, len) : 0;
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}
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static void f2fs_sb_release(struct kobject *kobj)
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{
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struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
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s_kobj);
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complete(&sbi->s_kobj_unregister);
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}
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#define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
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static struct f2fs_attr f2fs_attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode }, \
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.show = _show, \
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.store = _store, \
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.struct_type = _struct_type, \
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.offset = _offset \
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}
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#define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
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F2FS_ATTR_OFFSET(struct_type, name, 0644, \
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f2fs_sbi_show, f2fs_sbi_store, \
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offsetof(struct struct_name, elname))
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F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
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F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
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F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
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F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
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F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
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#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
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static struct attribute *f2fs_attrs[] = {
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ATTR_LIST(gc_min_sleep_time),
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ATTR_LIST(gc_max_sleep_time),
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ATTR_LIST(gc_no_gc_sleep_time),
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ATTR_LIST(gc_idle),
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ATTR_LIST(reclaim_segments),
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ATTR_LIST(max_small_discards),
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ATTR_LIST(batched_trim_sections),
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ATTR_LIST(ipu_policy),
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ATTR_LIST(min_ipu_util),
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ATTR_LIST(min_fsync_blocks),
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ATTR_LIST(max_victim_search),
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ATTR_LIST(dir_level),
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ATTR_LIST(ram_thresh),
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NULL,
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};
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static const struct sysfs_ops f2fs_attr_ops = {
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.show = f2fs_attr_show,
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.store = f2fs_attr_store,
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};
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static struct kobj_type f2fs_ktype = {
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.default_attrs = f2fs_attrs,
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.sysfs_ops = &f2fs_attr_ops,
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.release = f2fs_sb_release,
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};
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void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
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va_end(args);
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}
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static void init_once(void *foo)
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{
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struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
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inode_init_once(&fi->vfs_inode);
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}
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static int parse_options(struct super_block *sb, char *options)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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substring_t args[MAX_OPT_ARGS];
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char *p, *name;
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int arg = 0;
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if (!options)
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return 0;
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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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if (!*p)
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continue;
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/*
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* Initialize args struct so we know whether arg was
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* found; some options take optional arguments.
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*/
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args[0].to = args[0].from = NULL;
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token = match_token(p, f2fs_tokens, args);
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switch (token) {
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case Opt_gc_background:
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name = match_strdup(&args[0]);
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if (!name)
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return -ENOMEM;
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if (strlen(name) == 2 && !strncmp(name, "on", 2))
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set_opt(sbi, BG_GC);
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else if (strlen(name) == 3 && !strncmp(name, "off", 3))
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clear_opt(sbi, BG_GC);
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else {
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kfree(name);
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return -EINVAL;
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}
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kfree(name);
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break;
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case Opt_disable_roll_forward:
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set_opt(sbi, DISABLE_ROLL_FORWARD);
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break;
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case Opt_norecovery:
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/* this option mounts f2fs with ro */
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set_opt(sbi, DISABLE_ROLL_FORWARD);
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if (!f2fs_readonly(sb))
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return -EINVAL;
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break;
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case Opt_discard:
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set_opt(sbi, DISCARD);
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break;
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case Opt_noheap:
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set_opt(sbi, NOHEAP);
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break;
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#ifdef CONFIG_F2FS_FS_XATTR
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case Opt_user_xattr:
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set_opt(sbi, XATTR_USER);
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break;
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case Opt_nouser_xattr:
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clear_opt(sbi, XATTR_USER);
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break;
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case Opt_inline_xattr:
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set_opt(sbi, INLINE_XATTR);
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break;
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#else
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case Opt_user_xattr:
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f2fs_msg(sb, KERN_INFO,
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"user_xattr options not supported");
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break;
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case Opt_nouser_xattr:
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f2fs_msg(sb, KERN_INFO,
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"nouser_xattr options not supported");
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break;
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case Opt_inline_xattr:
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f2fs_msg(sb, KERN_INFO,
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"inline_xattr options not supported");
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break;
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#endif
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#ifdef CONFIG_F2FS_FS_POSIX_ACL
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case Opt_acl:
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set_opt(sbi, POSIX_ACL);
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break;
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case Opt_noacl:
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clear_opt(sbi, POSIX_ACL);
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break;
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#else
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case Opt_acl:
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f2fs_msg(sb, KERN_INFO, "acl options not supported");
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break;
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case Opt_noacl:
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f2fs_msg(sb, KERN_INFO, "noacl options not supported");
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break;
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#endif
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case Opt_active_logs:
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if (args->from && match_int(args, &arg))
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return -EINVAL;
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if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
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return -EINVAL;
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sbi->active_logs = arg;
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break;
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case Opt_disable_ext_identify:
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set_opt(sbi, DISABLE_EXT_IDENTIFY);
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break;
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case Opt_inline_data:
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set_opt(sbi, INLINE_DATA);
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break;
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case Opt_inline_dentry:
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set_opt(sbi, INLINE_DENTRY);
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break;
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case Opt_flush_merge:
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set_opt(sbi, FLUSH_MERGE);
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break;
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case Opt_nobarrier:
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set_opt(sbi, NOBARRIER);
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break;
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case Opt_fastboot:
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set_opt(sbi, FASTBOOT);
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break;
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case Opt_extent_cache:
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set_opt(sbi, EXTENT_CACHE);
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break;
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case Opt_noinline_data:
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clear_opt(sbi, INLINE_DATA);
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break;
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default:
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f2fs_msg(sb, KERN_ERR,
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"Unrecognized mount option \"%s\" or missing value",
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p);
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return -EINVAL;
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}
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}
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return 0;
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}
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static struct inode *f2fs_alloc_inode(struct super_block *sb)
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{
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struct f2fs_inode_info *fi;
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fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
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if (!fi)
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return NULL;
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init_once((void *) fi);
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/* Initialize f2fs-specific inode info */
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fi->vfs_inode.i_version = 1;
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atomic_set(&fi->dirty_pages, 0);
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fi->i_current_depth = 1;
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fi->i_advise = 0;
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rwlock_init(&fi->ext_lock);
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init_rwsem(&fi->i_sem);
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INIT_RADIX_TREE(&fi->inmem_root, GFP_NOFS);
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INIT_LIST_HEAD(&fi->inmem_pages);
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mutex_init(&fi->inmem_lock);
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set_inode_flag(fi, FI_NEW_INODE);
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if (test_opt(F2FS_SB(sb), INLINE_XATTR))
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set_inode_flag(fi, FI_INLINE_XATTR);
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/* Will be used by directory only */
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fi->i_dir_level = F2FS_SB(sb)->dir_level;
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return &fi->vfs_inode;
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}
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static int f2fs_drop_inode(struct inode *inode)
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{
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/*
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* This is to avoid a deadlock condition like below.
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* writeback_single_inode(inode)
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* - f2fs_write_data_page
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* - f2fs_gc -> iput -> evict
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* - inode_wait_for_writeback(inode)
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*/
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if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
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return 0;
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return generic_drop_inode(inode);
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}
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/*
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* f2fs_dirty_inode() is called from __mark_inode_dirty()
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*
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* We should call set_dirty_inode to write the dirty inode through write_inode.
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*/
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static void f2fs_dirty_inode(struct inode *inode, int flags)
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{
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set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
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}
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static void f2fs_i_callback(struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
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}
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static void f2fs_destroy_inode(struct inode *inode)
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{
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call_rcu(&inode->i_rcu, f2fs_i_callback);
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}
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static void f2fs_put_super(struct super_block *sb)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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if (sbi->s_proc) {
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remove_proc_entry("segment_info", sbi->s_proc);
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remove_proc_entry(sb->s_id, f2fs_proc_root);
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}
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kobject_del(&sbi->s_kobj);
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f2fs_destroy_stats(sbi);
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stop_gc_thread(sbi);
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/*
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* We don't need to do checkpoint when superblock is clean.
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* But, the previous checkpoint was not done by umount, it needs to do
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* clean checkpoint again.
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*/
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if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
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|
!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
|
|
struct cp_control cpc = {
|
|
.reason = CP_UMOUNT,
|
|
};
|
|
write_checkpoint(sbi, &cpc);
|
|
}
|
|
|
|
/*
|
|
* normally superblock is clean, so we need to release this.
|
|
* In addition, EIO will skip do checkpoint, we need this as well.
|
|
*/
|
|
release_dirty_inode(sbi);
|
|
release_discard_addrs(sbi);
|
|
|
|
iput(sbi->node_inode);
|
|
iput(sbi->meta_inode);
|
|
|
|
/* destroy f2fs internal modules */
|
|
destroy_node_manager(sbi);
|
|
destroy_segment_manager(sbi);
|
|
|
|
kfree(sbi->ckpt);
|
|
kobject_put(&sbi->s_kobj);
|
|
wait_for_completion(&sbi->s_kobj_unregister);
|
|
|
|
sb->s_fs_info = NULL;
|
|
brelse(sbi->raw_super_buf);
|
|
kfree(sbi);
|
|
}
|
|
|
|
int f2fs_sync_fs(struct super_block *sb, int sync)
|
|
{
|
|
struct f2fs_sb_info *sbi = F2FS_SB(sb);
|
|
|
|
trace_f2fs_sync_fs(sb, sync);
|
|
|
|
if (sync) {
|
|
struct cp_control cpc;
|
|
|
|
cpc.reason = __get_cp_reason(sbi);
|
|
|
|
mutex_lock(&sbi->gc_mutex);
|
|
write_checkpoint(sbi, &cpc);
|
|
mutex_unlock(&sbi->gc_mutex);
|
|
} else {
|
|
f2fs_balance_fs(sbi);
|
|
}
|
|
f2fs_trace_ios(NULL, NULL, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int f2fs_freeze(struct super_block *sb)
|
|
{
|
|
int err;
|
|
|
|
if (f2fs_readonly(sb))
|
|
return 0;
|
|
|
|
err = f2fs_sync_fs(sb, 1);
|
|
return err;
|
|
}
|
|
|
|
static int f2fs_unfreeze(struct super_block *sb)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct f2fs_sb_info *sbi = F2FS_SB(sb);
|
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
|
|
block_t total_count, user_block_count, start_count, ovp_count;
|
|
|
|
total_count = le64_to_cpu(sbi->raw_super->block_count);
|
|
user_block_count = sbi->user_block_count;
|
|
start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
|
|
ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
|
|
buf->f_type = F2FS_SUPER_MAGIC;
|
|
buf->f_bsize = sbi->blocksize;
|
|
|
|
buf->f_blocks = total_count - start_count;
|
|
buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
|
|
buf->f_bavail = user_block_count - valid_user_blocks(sbi);
|
|
|
|
buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
|
|
buf->f_ffree = buf->f_files - valid_inode_count(sbi);
|
|
|
|
buf->f_namelen = F2FS_NAME_LEN;
|
|
buf->f_fsid.val[0] = (u32)id;
|
|
buf->f_fsid.val[1] = (u32)(id >> 32);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
|
|
{
|
|
struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
|
|
|
|
if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
|
|
seq_printf(seq, ",background_gc=%s", "on");
|
|
else
|
|
seq_printf(seq, ",background_gc=%s", "off");
|
|
if (test_opt(sbi, DISABLE_ROLL_FORWARD))
|
|
seq_puts(seq, ",disable_roll_forward");
|
|
if (test_opt(sbi, DISCARD))
|
|
seq_puts(seq, ",discard");
|
|
if (test_opt(sbi, NOHEAP))
|
|
seq_puts(seq, ",no_heap_alloc");
|
|
#ifdef CONFIG_F2FS_FS_XATTR
|
|
if (test_opt(sbi, XATTR_USER))
|
|
seq_puts(seq, ",user_xattr");
|
|
else
|
|
seq_puts(seq, ",nouser_xattr");
|
|
if (test_opt(sbi, INLINE_XATTR))
|
|
seq_puts(seq, ",inline_xattr");
|
|
#endif
|
|
#ifdef CONFIG_F2FS_FS_POSIX_ACL
|
|
if (test_opt(sbi, POSIX_ACL))
|
|
seq_puts(seq, ",acl");
|
|
else
|
|
seq_puts(seq, ",noacl");
|
|
#endif
|
|
if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
|
|
seq_puts(seq, ",disable_ext_identify");
|
|
if (test_opt(sbi, INLINE_DATA))
|
|
seq_puts(seq, ",inline_data");
|
|
else
|
|
seq_puts(seq, ",noinline_data");
|
|
if (test_opt(sbi, INLINE_DENTRY))
|
|
seq_puts(seq, ",inline_dentry");
|
|
if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
|
|
seq_puts(seq, ",flush_merge");
|
|
if (test_opt(sbi, NOBARRIER))
|
|
seq_puts(seq, ",nobarrier");
|
|
if (test_opt(sbi, FASTBOOT))
|
|
seq_puts(seq, ",fastboot");
|
|
if (test_opt(sbi, EXTENT_CACHE))
|
|
seq_puts(seq, ",extent_cache");
|
|
seq_printf(seq, ",active_logs=%u", sbi->active_logs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int segment_info_seq_show(struct seq_file *seq, void *offset)
|
|
{
|
|
struct super_block *sb = seq->private;
|
|
struct f2fs_sb_info *sbi = F2FS_SB(sb);
|
|
unsigned int total_segs =
|
|
le32_to_cpu(sbi->raw_super->segment_count_main);
|
|
int i;
|
|
|
|
seq_puts(seq, "format: segment_type|valid_blocks\n"
|
|
"segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
|
|
|
|
for (i = 0; i < total_segs; i++) {
|
|
struct seg_entry *se = get_seg_entry(sbi, i);
|
|
|
|
if ((i % 10) == 0)
|
|
seq_printf(seq, "%-5d", i);
|
|
seq_printf(seq, "%d|%-3u", se->type,
|
|
get_valid_blocks(sbi, i, 1));
|
|
if ((i % 10) == 9 || i == (total_segs - 1))
|
|
seq_putc(seq, '\n');
|
|
else
|
|
seq_putc(seq, ' ');
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int segment_info_open_fs(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, segment_info_seq_show, PDE_DATA(inode));
|
|
}
|
|
|
|
static const struct file_operations f2fs_seq_segment_info_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = segment_info_open_fs,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int f2fs_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
struct f2fs_sb_info *sbi = F2FS_SB(sb);
|
|
struct f2fs_mount_info org_mount_opt;
|
|
int err, active_logs;
|
|
bool need_restart_gc = false;
|
|
bool need_stop_gc = false;
|
|
|
|
sync_filesystem(sb);
|
|
|
|
/*
|
|
* Save the old mount options in case we
|
|
* need to restore them.
|
|
*/
|
|
org_mount_opt = sbi->mount_opt;
|
|
active_logs = sbi->active_logs;
|
|
|
|
sbi->mount_opt.opt = 0;
|
|
sbi->active_logs = NR_CURSEG_TYPE;
|
|
|
|
/* parse mount options */
|
|
err = parse_options(sb, data);
|
|
if (err)
|
|
goto restore_opts;
|
|
|
|
/*
|
|
* Previous and new state of filesystem is RO,
|
|
* so skip checking GC and FLUSH_MERGE conditions.
|
|
*/
|
|
if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
|
|
goto skip;
|
|
|
|
/*
|
|
* We stop the GC thread if FS is mounted as RO
|
|
* or if background_gc = off is passed in mount
|
|
* option. Also sync the filesystem.
|
|
*/
|
|
if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
|
|
if (sbi->gc_thread) {
|
|
stop_gc_thread(sbi);
|
|
f2fs_sync_fs(sb, 1);
|
|
need_restart_gc = true;
|
|
}
|
|
} else if (!sbi->gc_thread) {
|
|
err = start_gc_thread(sbi);
|
|
if (err)
|
|
goto restore_opts;
|
|
need_stop_gc = true;
|
|
}
|
|
|
|
/*
|
|
* We stop issue flush thread if FS is mounted as RO
|
|
* or if flush_merge is not passed in mount option.
|
|
*/
|
|
if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
|
|
destroy_flush_cmd_control(sbi);
|
|
} else if (!SM_I(sbi)->cmd_control_info) {
|
|
err = create_flush_cmd_control(sbi);
|
|
if (err)
|
|
goto restore_gc;
|
|
}
|
|
skip:
|
|
/* Update the POSIXACL Flag */
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
|
|
(test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
|
|
return 0;
|
|
restore_gc:
|
|
if (need_restart_gc) {
|
|
if (start_gc_thread(sbi))
|
|
f2fs_msg(sbi->sb, KERN_WARNING,
|
|
"background gc thread has stopped");
|
|
} else if (need_stop_gc) {
|
|
stop_gc_thread(sbi);
|
|
}
|
|
restore_opts:
|
|
sbi->mount_opt = org_mount_opt;
|
|
sbi->active_logs = active_logs;
|
|
return err;
|
|
}
|
|
|
|
static struct super_operations f2fs_sops = {
|
|
.alloc_inode = f2fs_alloc_inode,
|
|
.drop_inode = f2fs_drop_inode,
|
|
.destroy_inode = f2fs_destroy_inode,
|
|
.write_inode = f2fs_write_inode,
|
|
.dirty_inode = f2fs_dirty_inode,
|
|
.show_options = f2fs_show_options,
|
|
.evict_inode = f2fs_evict_inode,
|
|
.put_super = f2fs_put_super,
|
|
.sync_fs = f2fs_sync_fs,
|
|
.freeze_fs = f2fs_freeze,
|
|
.unfreeze_fs = f2fs_unfreeze,
|
|
.statfs = f2fs_statfs,
|
|
.remount_fs = f2fs_remount,
|
|
};
|
|
|
|
static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
|
|
u64 ino, u32 generation)
|
|
{
|
|
struct f2fs_sb_info *sbi = F2FS_SB(sb);
|
|
struct inode *inode;
|
|
|
|
if (check_nid_range(sbi, ino))
|
|
return ERR_PTR(-ESTALE);
|
|
|
|
/*
|
|
* f2fs_iget isn't quite right if the inode is currently unallocated!
|
|
* However f2fs_iget currently does appropriate checks to handle stale
|
|
* inodes so everything is OK.
|
|
*/
|
|
inode = f2fs_iget(sb, ino);
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
if (unlikely(generation && inode->i_generation != generation)) {
|
|
/* we didn't find the right inode.. */
|
|
iput(inode);
|
|
return ERR_PTR(-ESTALE);
|
|
}
|
|
return inode;
|
|
}
|
|
|
|
static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fh_type)
|
|
{
|
|
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
|
|
f2fs_nfs_get_inode);
|
|
}
|
|
|
|
static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fh_type)
|
|
{
|
|
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
|
|
f2fs_nfs_get_inode);
|
|
}
|
|
|
|
static const struct export_operations f2fs_export_ops = {
|
|
.fh_to_dentry = f2fs_fh_to_dentry,
|
|
.fh_to_parent = f2fs_fh_to_parent,
|
|
.get_parent = f2fs_get_parent,
|
|
};
|
|
|
|
static loff_t max_file_size(unsigned bits)
|
|
{
|
|
loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
|
|
loff_t leaf_count = ADDRS_PER_BLOCK;
|
|
|
|
/* two direct node blocks */
|
|
result += (leaf_count * 2);
|
|
|
|
/* two indirect node blocks */
|
|
leaf_count *= NIDS_PER_BLOCK;
|
|
result += (leaf_count * 2);
|
|
|
|
/* one double indirect node block */
|
|
leaf_count *= NIDS_PER_BLOCK;
|
|
result += leaf_count;
|
|
|
|
result <<= bits;
|
|
return result;
|
|
}
|
|
|
|
static int sanity_check_raw_super(struct super_block *sb,
|
|
struct f2fs_super_block *raw_super)
|
|
{
|
|
unsigned int blocksize;
|
|
|
|
if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
|
|
f2fs_msg(sb, KERN_INFO,
|
|
"Magic Mismatch, valid(0x%x) - read(0x%x)",
|
|
F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
|
|
return 1;
|
|
}
|
|
|
|
/* Currently, support only 4KB page cache size */
|
|
if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
|
|
f2fs_msg(sb, KERN_INFO,
|
|
"Invalid page_cache_size (%lu), supports only 4KB\n",
|
|
PAGE_CACHE_SIZE);
|
|
return 1;
|
|
}
|
|
|
|
/* Currently, support only 4KB block size */
|
|
blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
|
|
if (blocksize != F2FS_BLKSIZE) {
|
|
f2fs_msg(sb, KERN_INFO,
|
|
"Invalid blocksize (%u), supports only 4KB\n",
|
|
blocksize);
|
|
return 1;
|
|
}
|
|
|
|
/* Currently, support 512/1024/2048/4096 bytes sector size */
|
|
if (le32_to_cpu(raw_super->log_sectorsize) >
|
|
F2FS_MAX_LOG_SECTOR_SIZE ||
|
|
le32_to_cpu(raw_super->log_sectorsize) <
|
|
F2FS_MIN_LOG_SECTOR_SIZE) {
|
|
f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
|
|
le32_to_cpu(raw_super->log_sectorsize));
|
|
return 1;
|
|
}
|
|
if (le32_to_cpu(raw_super->log_sectors_per_block) +
|
|
le32_to_cpu(raw_super->log_sectorsize) !=
|
|
F2FS_MAX_LOG_SECTOR_SIZE) {
|
|
f2fs_msg(sb, KERN_INFO,
|
|
"Invalid log sectors per block(%u) log sectorsize(%u)",
|
|
le32_to_cpu(raw_super->log_sectors_per_block),
|
|
le32_to_cpu(raw_super->log_sectorsize));
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
|
|
{
|
|
unsigned int total, fsmeta;
|
|
struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
|
|
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
|
|
|
|
total = le32_to_cpu(raw_super->segment_count);
|
|
fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
|
|
fsmeta += le32_to_cpu(raw_super->segment_count_sit);
|
|
fsmeta += le32_to_cpu(raw_super->segment_count_nat);
|
|
fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
|
|
fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
|
|
|
|
if (unlikely(fsmeta >= total))
|
|
return 1;
|
|
|
|
if (unlikely(f2fs_cp_error(sbi))) {
|
|
f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void init_sb_info(struct f2fs_sb_info *sbi)
|
|
{
|
|
struct f2fs_super_block *raw_super = sbi->raw_super;
|
|
int i;
|
|
|
|
sbi->log_sectors_per_block =
|
|
le32_to_cpu(raw_super->log_sectors_per_block);
|
|
sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
|
|
sbi->blocksize = 1 << sbi->log_blocksize;
|
|
sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
|
|
sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
|
|
sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
|
|
sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
|
|
sbi->total_sections = le32_to_cpu(raw_super->section_count);
|
|
sbi->total_node_count =
|
|
(le32_to_cpu(raw_super->segment_count_nat) / 2)
|
|
* sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
|
|
sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
|
|
sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
|
|
sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
|
|
sbi->cur_victim_sec = NULL_SECNO;
|
|
sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
|
|
|
|
for (i = 0; i < NR_COUNT_TYPE; i++)
|
|
atomic_set(&sbi->nr_pages[i], 0);
|
|
|
|
sbi->dir_level = DEF_DIR_LEVEL;
|
|
clear_sbi_flag(sbi, SBI_NEED_FSCK);
|
|
}
|
|
|
|
/*
|
|
* Read f2fs raw super block.
|
|
* Because we have two copies of super block, so read the first one at first,
|
|
* if the first one is invalid, move to read the second one.
|
|
*/
|
|
static int read_raw_super_block(struct super_block *sb,
|
|
struct f2fs_super_block **raw_super,
|
|
struct buffer_head **raw_super_buf)
|
|
{
|
|
int block = 0;
|
|
|
|
retry:
|
|
*raw_super_buf = sb_bread(sb, block);
|
|
if (!*raw_super_buf) {
|
|
f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
|
|
block + 1);
|
|
if (block == 0) {
|
|
block++;
|
|
goto retry;
|
|
} else {
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
*raw_super = (struct f2fs_super_block *)
|
|
((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
|
|
|
|
/* sanity checking of raw super */
|
|
if (sanity_check_raw_super(sb, *raw_super)) {
|
|
brelse(*raw_super_buf);
|
|
f2fs_msg(sb, KERN_ERR,
|
|
"Can't find valid F2FS filesystem in %dth superblock",
|
|
block + 1);
|
|
if (block == 0) {
|
|
block++;
|
|
goto retry;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct f2fs_sb_info *sbi;
|
|
struct f2fs_super_block *raw_super = NULL;
|
|
struct buffer_head *raw_super_buf;
|
|
struct inode *root;
|
|
long err = -EINVAL;
|
|
bool retry = true, need_fsck = false;
|
|
char *options = NULL;
|
|
int i;
|
|
|
|
try_onemore:
|
|
/* allocate memory for f2fs-specific super block info */
|
|
sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
|
|
if (!sbi)
|
|
return -ENOMEM;
|
|
|
|
/* set a block size */
|
|
if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
|
|
f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
|
|
goto free_sbi;
|
|
}
|
|
|
|
err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
|
|
if (err)
|
|
goto free_sbi;
|
|
|
|
sb->s_fs_info = sbi;
|
|
/* init some FS parameters */
|
|
sbi->active_logs = NR_CURSEG_TYPE;
|
|
|
|
set_opt(sbi, BG_GC);
|
|
set_opt(sbi, INLINE_DATA);
|
|
|
|
#ifdef CONFIG_F2FS_FS_XATTR
|
|
set_opt(sbi, XATTR_USER);
|
|
#endif
|
|
#ifdef CONFIG_F2FS_FS_POSIX_ACL
|
|
set_opt(sbi, POSIX_ACL);
|
|
#endif
|
|
/* parse mount options */
|
|
options = kstrdup((const char *)data, GFP_KERNEL);
|
|
if (data && !options) {
|
|
err = -ENOMEM;
|
|
goto free_sb_buf;
|
|
}
|
|
|
|
err = parse_options(sb, options);
|
|
if (err)
|
|
goto free_options;
|
|
|
|
sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
|
|
sb->s_max_links = F2FS_LINK_MAX;
|
|
get_random_bytes(&sbi->s_next_generation, sizeof(u32));
|
|
|
|
sb->s_op = &f2fs_sops;
|
|
sb->s_xattr = f2fs_xattr_handlers;
|
|
sb->s_export_op = &f2fs_export_ops;
|
|
sb->s_magic = F2FS_SUPER_MAGIC;
|
|
sb->s_time_gran = 1;
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
|
|
(test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
|
|
memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
|
|
|
|
/* init f2fs-specific super block info */
|
|
sbi->sb = sb;
|
|
sbi->raw_super = raw_super;
|
|
sbi->raw_super_buf = raw_super_buf;
|
|
mutex_init(&sbi->gc_mutex);
|
|
mutex_init(&sbi->writepages);
|
|
mutex_init(&sbi->cp_mutex);
|
|
init_rwsem(&sbi->node_write);
|
|
clear_sbi_flag(sbi, SBI_POR_DOING);
|
|
spin_lock_init(&sbi->stat_lock);
|
|
|
|
init_rwsem(&sbi->read_io.io_rwsem);
|
|
sbi->read_io.sbi = sbi;
|
|
sbi->read_io.bio = NULL;
|
|
for (i = 0; i < NR_PAGE_TYPE; i++) {
|
|
init_rwsem(&sbi->write_io[i].io_rwsem);
|
|
sbi->write_io[i].sbi = sbi;
|
|
sbi->write_io[i].bio = NULL;
|
|
}
|
|
|
|
init_rwsem(&sbi->cp_rwsem);
|
|
init_waitqueue_head(&sbi->cp_wait);
|
|
init_sb_info(sbi);
|
|
|
|
/* get an inode for meta space */
|
|
sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
|
|
if (IS_ERR(sbi->meta_inode)) {
|
|
f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
|
|
err = PTR_ERR(sbi->meta_inode);
|
|
goto free_options;
|
|
}
|
|
|
|
err = get_valid_checkpoint(sbi);
|
|
if (err) {
|
|
f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
|
|
goto free_meta_inode;
|
|
}
|
|
|
|
/* sanity checking of checkpoint */
|
|
err = -EINVAL;
|
|
if (sanity_check_ckpt(sbi)) {
|
|
f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
|
|
goto free_cp;
|
|
}
|
|
|
|
sbi->total_valid_node_count =
|
|
le32_to_cpu(sbi->ckpt->valid_node_count);
|
|
sbi->total_valid_inode_count =
|
|
le32_to_cpu(sbi->ckpt->valid_inode_count);
|
|
sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
|
|
sbi->total_valid_block_count =
|
|
le64_to_cpu(sbi->ckpt->valid_block_count);
|
|
sbi->last_valid_block_count = sbi->total_valid_block_count;
|
|
sbi->alloc_valid_block_count = 0;
|
|
INIT_LIST_HEAD(&sbi->dir_inode_list);
|
|
spin_lock_init(&sbi->dir_inode_lock);
|
|
|
|
init_extent_cache_info(sbi);
|
|
|
|
init_ino_entry_info(sbi);
|
|
|
|
/* setup f2fs internal modules */
|
|
err = build_segment_manager(sbi);
|
|
if (err) {
|
|
f2fs_msg(sb, KERN_ERR,
|
|
"Failed to initialize F2FS segment manager");
|
|
goto free_sm;
|
|
}
|
|
err = build_node_manager(sbi);
|
|
if (err) {
|
|
f2fs_msg(sb, KERN_ERR,
|
|
"Failed to initialize F2FS node manager");
|
|
goto free_nm;
|
|
}
|
|
|
|
build_gc_manager(sbi);
|
|
|
|
/* get an inode for node space */
|
|
sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
|
|
if (IS_ERR(sbi->node_inode)) {
|
|
f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
|
|
err = PTR_ERR(sbi->node_inode);
|
|
goto free_nm;
|
|
}
|
|
|
|
/* if there are nt orphan nodes free them */
|
|
recover_orphan_inodes(sbi);
|
|
|
|
/* read root inode and dentry */
|
|
root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
|
|
if (IS_ERR(root)) {
|
|
f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
|
|
err = PTR_ERR(root);
|
|
goto free_node_inode;
|
|
}
|
|
if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
|
|
iput(root);
|
|
err = -EINVAL;
|
|
goto free_node_inode;
|
|
}
|
|
|
|
sb->s_root = d_make_root(root); /* allocate root dentry */
|
|
if (!sb->s_root) {
|
|
err = -ENOMEM;
|
|
goto free_root_inode;
|
|
}
|
|
|
|
err = f2fs_build_stats(sbi);
|
|
if (err)
|
|
goto free_root_inode;
|
|
|
|
if (f2fs_proc_root)
|
|
sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
|
|
|
|
if (sbi->s_proc)
|
|
proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
|
|
&f2fs_seq_segment_info_fops, sb);
|
|
|
|
if (test_opt(sbi, DISCARD)) {
|
|
struct request_queue *q = bdev_get_queue(sb->s_bdev);
|
|
if (!blk_queue_discard(q))
|
|
f2fs_msg(sb, KERN_WARNING,
|
|
"mounting with \"discard\" option, but "
|
|
"the device does not support discard");
|
|
}
|
|
|
|
sbi->s_kobj.kset = f2fs_kset;
|
|
init_completion(&sbi->s_kobj_unregister);
|
|
err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
|
|
"%s", sb->s_id);
|
|
if (err)
|
|
goto free_proc;
|
|
|
|
/* recover fsynced data */
|
|
if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
|
|
/*
|
|
* mount should be failed, when device has readonly mode, and
|
|
* previous checkpoint was not done by clean system shutdown.
|
|
*/
|
|
if (bdev_read_only(sb->s_bdev) &&
|
|
!is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) {
|
|
err = -EROFS;
|
|
goto free_kobj;
|
|
}
|
|
|
|
if (need_fsck)
|
|
set_sbi_flag(sbi, SBI_NEED_FSCK);
|
|
|
|
err = recover_fsync_data(sbi);
|
|
if (err) {
|
|
need_fsck = true;
|
|
f2fs_msg(sb, KERN_ERR,
|
|
"Cannot recover all fsync data errno=%ld", err);
|
|
goto free_kobj;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If filesystem is not mounted as read-only then
|
|
* do start the gc_thread.
|
|
*/
|
|
if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
|
|
/* After POR, we can run background GC thread.*/
|
|
err = start_gc_thread(sbi);
|
|
if (err)
|
|
goto free_kobj;
|
|
}
|
|
kfree(options);
|
|
return 0;
|
|
|
|
free_kobj:
|
|
kobject_del(&sbi->s_kobj);
|
|
free_proc:
|
|
if (sbi->s_proc) {
|
|
remove_proc_entry("segment_info", sbi->s_proc);
|
|
remove_proc_entry(sb->s_id, f2fs_proc_root);
|
|
}
|
|
f2fs_destroy_stats(sbi);
|
|
free_root_inode:
|
|
dput(sb->s_root);
|
|
sb->s_root = NULL;
|
|
free_node_inode:
|
|
iput(sbi->node_inode);
|
|
free_nm:
|
|
destroy_node_manager(sbi);
|
|
free_sm:
|
|
destroy_segment_manager(sbi);
|
|
free_cp:
|
|
kfree(sbi->ckpt);
|
|
free_meta_inode:
|
|
make_bad_inode(sbi->meta_inode);
|
|
iput(sbi->meta_inode);
|
|
free_options:
|
|
kfree(options);
|
|
free_sb_buf:
|
|
brelse(raw_super_buf);
|
|
free_sbi:
|
|
kfree(sbi);
|
|
|
|
/* give only one another chance */
|
|
if (retry) {
|
|
retry = false;
|
|
shrink_dcache_sb(sb);
|
|
goto try_onemore;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
|
|
const char *dev_name, void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
|
|
}
|
|
|
|
static void kill_f2fs_super(struct super_block *sb)
|
|
{
|
|
if (sb->s_root)
|
|
set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
|
|
kill_block_super(sb);
|
|
}
|
|
|
|
static struct file_system_type f2fs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "f2fs",
|
|
.mount = f2fs_mount,
|
|
.kill_sb = kill_f2fs_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
MODULE_ALIAS_FS("f2fs");
|
|
|
|
static int __init init_inodecache(void)
|
|
{
|
|
f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
|
|
sizeof(struct f2fs_inode_info));
|
|
if (!f2fs_inode_cachep)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_inodecache(void)
|
|
{
|
|
/*
|
|
* Make sure all delayed rcu free inodes are flushed before we
|
|
* destroy cache.
|
|
*/
|
|
rcu_barrier();
|
|
kmem_cache_destroy(f2fs_inode_cachep);
|
|
}
|
|
|
|
static int __init init_f2fs_fs(void)
|
|
{
|
|
int err;
|
|
|
|
f2fs_build_trace_ios();
|
|
|
|
err = init_inodecache();
|
|
if (err)
|
|
goto fail;
|
|
err = create_node_manager_caches();
|
|
if (err)
|
|
goto free_inodecache;
|
|
err = create_segment_manager_caches();
|
|
if (err)
|
|
goto free_node_manager_caches;
|
|
err = create_checkpoint_caches();
|
|
if (err)
|
|
goto free_segment_manager_caches;
|
|
err = create_extent_cache();
|
|
if (err)
|
|
goto free_checkpoint_caches;
|
|
f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
|
|
if (!f2fs_kset) {
|
|
err = -ENOMEM;
|
|
goto free_extent_cache;
|
|
}
|
|
err = register_filesystem(&f2fs_fs_type);
|
|
if (err)
|
|
goto free_kset;
|
|
f2fs_create_root_stats();
|
|
f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
|
|
return 0;
|
|
|
|
free_kset:
|
|
kset_unregister(f2fs_kset);
|
|
free_extent_cache:
|
|
destroy_extent_cache();
|
|
free_checkpoint_caches:
|
|
destroy_checkpoint_caches();
|
|
free_segment_manager_caches:
|
|
destroy_segment_manager_caches();
|
|
free_node_manager_caches:
|
|
destroy_node_manager_caches();
|
|
free_inodecache:
|
|
destroy_inodecache();
|
|
fail:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_f2fs_fs(void)
|
|
{
|
|
remove_proc_entry("fs/f2fs", NULL);
|
|
f2fs_destroy_root_stats();
|
|
unregister_filesystem(&f2fs_fs_type);
|
|
destroy_extent_cache();
|
|
destroy_checkpoint_caches();
|
|
destroy_segment_manager_caches();
|
|
destroy_node_manager_caches();
|
|
destroy_inodecache();
|
|
kset_unregister(f2fs_kset);
|
|
f2fs_destroy_trace_ios();
|
|
}
|
|
|
|
module_init(init_f2fs_fs)
|
|
module_exit(exit_f2fs_fs)
|
|
|
|
MODULE_AUTHOR("Samsung Electronics's Praesto Team");
|
|
MODULE_DESCRIPTION("Flash Friendly File System");
|
|
MODULE_LICENSE("GPL");
|