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super.c
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super.c
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/*
* BRIEF DESCRIPTION
*
* Super block operations.
*
* Copyright 2012-2013 Intel Corporation
* Copyright 2009-2011 Marco Stornelli <[email protected]>
* Copyright 2003 Sony Corporation
* Copyright 2003 Matsushita Electric Industrial Co., Ltd.
* 2003-2004 (c) MontaVista Software, Inc. , Steve Longerbeam
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/parser.h>
#include <linux/vfs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/mm.h>
#include <linux/ctype.h>
#include <linux/bitops.h>
#include <linux/magic.h>
#include <linux/exportfs.h>
#include <linux/random.h>
#include <linux/cred.h>
#include <linux/backing-dev.h>
#include <linux/list.h>
#include <linux/dax.h>
#include "pmfs.h"
int measure_timing = 0;
int support_clwb = 0;
int support_pcommit = 0;
module_param(measure_timing, int, S_IRUGO);
MODULE_PARM_DESC(measure_timing, "Timing measurement");
static struct super_operations pmfs_sops;
static const struct export_operations pmfs_export_ops;
static struct kmem_cache *pmfs_inode_cachep;
static struct kmem_cache *pmfs_blocknode_cachep;
static struct kmem_cache *pmfs_transaction_cachep;
/* FIXME: should the following variable be one per PMFS instance? */
unsigned int pmfs_dbgmask = 0;
#ifdef CONFIG_PMFS_TEST
static void *first_pmfs_super;
struct pmfs_super_block *get_pmfs_super(void)
{
return (struct pmfs_super_block *)first_pmfs_super;
}
EXPORT_SYMBOL(get_pmfs_super);
#endif
void pmfs_error_mng(struct super_block *sb, const char *fmt, ...)
{
va_list args;
printk("pmfs error: ");
va_start(args, fmt);
vprintk(fmt, args);
va_end(args);
if (test_opt(sb, ERRORS_PANIC))
panic("pmfs: panic from previous error\n");
if (test_opt(sb, ERRORS_RO)) {
printk(KERN_CRIT "pmfs err: remounting filesystem read-only");
sb->s_flags |= MS_RDONLY;
}
}
static void pmfs_set_blocksize(struct super_block *sb, unsigned long size)
{
int bits;
/*
* We've already validated the user input and the value here must be
* between PMFS_MAX_BLOCK_SIZE and PMFS_MIN_BLOCK_SIZE
* and it must be a power of 2.
*/
bits = fls(size) - 1;
sb->s_blocksize_bits = bits;
sb->s_blocksize = (1 << bits);
}
static inline int pmfs_has_huge_ioremap(struct super_block *sb)
{
struct pmfs_sb_info *sbi = (struct pmfs_sb_info *)sb->s_fs_info;
return sbi->s_mount_opt & PMFS_MOUNT_HUGEIOREMAP;
}
static int pmfs_get_block_info(struct super_block *sb,
struct pmfs_sb_info *sbi)
{
struct dax_device *dax_dev;
void *virt_addr = NULL;
pfn_t __pfn_t;
long size;
int ret;
ret = bdev_dax_supported(sb, PAGE_SIZE);
if (ret) {
pmfs_err(sb, "device does not support DAX\n");
return -EINVAL;
}
sbi->s_bdev = sb->s_bdev;
dax_dev = fs_dax_get_by_host(sb->s_bdev->bd_disk->disk_name);
if (!dax_dev) {
pmfs_err(sb, "Couldn't retrieve DAX device\n");
return -EINVAL;
}
size = dax_direct_access(dax_dev, 0, LONG_MAX / PAGE_SIZE,
&virt_addr, &__pfn_t) * PAGE_SIZE;
if (size <= 0) {
pmfs_err(sb, "direct_access failed\n");
return -EINVAL;
}
sbi->virt_addr = virt_addr;
sbi->phys_addr = pfn_t_to_pfn(__pfn_t) << PAGE_SHIFT;
sbi->initsize = size;
return 0;
}
static loff_t pmfs_max_size(int bits)
{
loff_t res;
res = (1ULL << (3 * 9 + bits)) - 1;
if (res > MAX_LFS_FILESIZE)
res = MAX_LFS_FILESIZE;
pmfs_dbg_verbose("max file size %llu bytes\n", res);
return res;
}
enum {
Opt_bpi, Opt_init, Opt_jsize,
Opt_num_inodes, Opt_mode, Opt_uid,
Opt_gid, Opt_blocksize, Opt_wprotect, Opt_wprotectold,
Opt_err_cont, Opt_err_panic, Opt_err_ro,
Opt_hugemmap, Opt_nohugeioremap, Opt_dbgmask, Opt_bs, Opt_err
};
static const match_table_t tokens = {
{ Opt_bpi, "bpi=%u" },
{ Opt_init, "init" },
{ Opt_jsize, "jsize=%s" },
{ Opt_num_inodes,"num_inodes=%u" },
{ Opt_mode, "mode=%o" },
{ Opt_uid, "uid=%u" },
{ Opt_gid, "gid=%u" },
{ Opt_wprotect, "wprotect" },
{ Opt_wprotectold, "wprotectold" },
{ Opt_err_cont, "errors=continue" },
{ Opt_err_panic, "errors=panic" },
{ Opt_err_ro, "errors=remount-ro" },
{ Opt_hugemmap, "hugemmap" },
{ Opt_nohugeioremap, "nohugeioremap" },
{ Opt_dbgmask, "dbgmask=%u" },
{ Opt_bs, "backing_dev=%s" },
{ Opt_err, NULL },
};
static int pmfs_parse_options(char *options, struct pmfs_sb_info *sbi,
bool remount)
{
char *p, *rest;
substring_t args[MAX_OPT_ARGS];
int option;
if (!options)
return 0;
while ((p = strsep(&options, ",")) != NULL) {
int token;
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case Opt_bpi:
if (remount)
goto bad_opt;
if (match_int(&args[0], &option))
goto bad_val;
sbi->bpi = option;
break;
case Opt_uid:
if (remount)
goto bad_opt;
if (match_int(&args[0], &option))
goto bad_val;
sbi->uid = make_kuid(current_user_ns(), option);
break;
case Opt_gid:
if (match_int(&args[0], &option))
goto bad_val;
sbi->gid = make_kgid(current_user_ns(), option);
break;
case Opt_mode:
if (match_octal(&args[0], &option))
goto bad_val;
sbi->mode = option & 01777U;
break;
case Opt_init:
if (remount)
goto bad_opt;
set_opt(sbi->s_mount_opt, FORMAT);
break;
case Opt_jsize:
if (remount)
goto bad_opt;
/* memparse() will accept a K/M/G without a digit */
if (!isdigit(*args[0].from))
goto bad_val;
sbi->jsize = memparse(args[0].from, &rest);
/* make sure journal size is integer power of 2 */
if (sbi->jsize & (sbi->jsize - 1) ||
sbi->jsize < PMFS_MINIMUM_JOURNAL_SIZE) {
pmfs_dbg("Invalid jsize: "
"must be whole power of 2 & >= 64KB\n");
goto bad_val;
}
break;
case Opt_num_inodes:
if (remount)
goto bad_opt;
if (match_int(&args[0], &option))
goto bad_val;
sbi->num_inodes = option;
break;
case Opt_err_panic:
clear_opt(sbi->s_mount_opt, ERRORS_CONT);
clear_opt(sbi->s_mount_opt, ERRORS_RO);
set_opt(sbi->s_mount_opt, ERRORS_PANIC);
break;
case Opt_err_ro:
clear_opt(sbi->s_mount_opt, ERRORS_CONT);
clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
set_opt(sbi->s_mount_opt, ERRORS_RO);
break;
case Opt_err_cont:
clear_opt(sbi->s_mount_opt, ERRORS_RO);
clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
set_opt(sbi->s_mount_opt, ERRORS_CONT);
break;
case Opt_wprotect:
if (remount)
goto bad_opt;
set_opt(sbi->s_mount_opt, PROTECT);
pmfs_info
("PMFS: Enabling new Write Protection (CR0.WP)\n");
break;
case Opt_wprotectold:
if (remount)
goto bad_opt;
set_opt(sbi->s_mount_opt, PROTECT_OLD);
pmfs_info
("PMFS: Enabling old Write Protection (PAGE RW Bit)\n");
break;
case Opt_hugemmap:
if (remount)
goto bad_opt;
set_opt(sbi->s_mount_opt, HUGEMMAP);
pmfs_info("PMFS: Enabling huge mappings for mmap\n");
break;
case Opt_nohugeioremap:
if (remount)
goto bad_opt;
clear_opt(sbi->s_mount_opt, HUGEIOREMAP);
pmfs_info("PMFS: Disabling huge ioremap\n");
break;
case Opt_dbgmask:
if (match_int(&args[0], &option))
goto bad_val;
pmfs_dbgmask = option;
break;
default: {
goto bad_opt;
}
}
}
return 0;
bad_val:
printk(KERN_INFO "Bad value '%s' for mount option '%s'\n", args[0].from,
p);
return -EINVAL;
bad_opt:
printk(KERN_INFO "Bad mount option: \"%s\"\n", p);
return -EINVAL;
}
static bool pmfs_check_size (struct super_block *sb, unsigned long size)
{
struct pmfs_sb_info *sbi = PMFS_SB(sb);
unsigned long minimum_size, num_blocks;
/* space required for super block and root directory */
minimum_size = 2 << sb->s_blocksize_bits;
/* space required for inode table */
if (sbi->num_inodes > 0)
num_blocks = (sbi->num_inodes >>
(sb->s_blocksize_bits - PMFS_INODE_BITS)) + 1;
else
num_blocks = 1;
minimum_size += (num_blocks << sb->s_blocksize_bits);
/* space required for journal */
minimum_size += sbi->jsize;
if (size < minimum_size)
return false;
return true;
}
static struct pmfs_inode *pmfs_init(struct super_block *sb,
unsigned long size)
{
unsigned long blocksize;
u64 journal_meta_start, journal_data_start, inode_table_start;
struct pmfs_inode *root_i;
struct pmfs_super_block *super;
struct pmfs_sb_info *sbi = PMFS_SB(sb);
struct pmfs_direntry *de;
unsigned long blocknr;
pmfs_info("creating an empty pmfs of size %lu\n", size);
sbi->block_start = (unsigned long)0;
sbi->block_end = ((unsigned long)(size) >> PAGE_SHIFT);
sbi->num_free_blocks = ((unsigned long)(size) >> PAGE_SHIFT);
if (!sbi->virt_addr) {
printk(KERN_ERR "ioremap of the pmfs image failed(1)\n");
return ERR_PTR(-EINVAL);
}
#ifdef CONFIG_PMFS_TEST
if (!first_pmfs_super)
first_pmfs_super = sbi->virt_addr;
#endif
pmfs_dbg_verbose("pmfs: Default block size set to 4K\n");
blocksize = sbi->blocksize = PMFS_DEF_BLOCK_SIZE_4K;
pmfs_set_blocksize(sb, blocksize);
blocksize = sb->s_blocksize;
if (sbi->blocksize && sbi->blocksize != blocksize)
sbi->blocksize = blocksize;
if (!pmfs_check_size(sb, size)) {
pmfs_dbg("Specified PMFS size too small 0x%lx. Either increase"
" PMFS size, or reduce num. of inodes (minimum 32)"
" or journal size (minimum 64KB)\n", size);
return ERR_PTR(-EINVAL);
}
journal_meta_start = sizeof(struct pmfs_super_block);
journal_meta_start = (journal_meta_start + CACHELINE_SIZE - 1) &
~(CACHELINE_SIZE - 1);
inode_table_start = journal_meta_start + sizeof(pmfs_journal_t);
inode_table_start = (inode_table_start + CACHELINE_SIZE - 1) &
~(CACHELINE_SIZE - 1);
if ((inode_table_start + sizeof(struct pmfs_inode)) > PMFS_SB_SIZE) {
pmfs_dbg("PMFS super block defined too small. defined 0x%x, "
"required 0x%llx\n", PMFS_SB_SIZE,
inode_table_start + sizeof(struct pmfs_inode));
return ERR_PTR(-EINVAL);
}
journal_data_start = PMFS_SB_SIZE * 2;
journal_data_start = (journal_data_start + blocksize - 1) &
~(blocksize - 1);
pmfs_dbg_verbose("journal meta start %llx data start 0x%llx, "
"journal size 0x%x, inode_table 0x%llx\n", journal_meta_start,
journal_data_start, sbi->jsize, inode_table_start);
pmfs_dbg_verbose("max file name len %d\n", (unsigned int)PMFS_NAME_LEN);
super = pmfs_get_super(sb);
pmfs_memunlock_range(sb, super, journal_data_start);
/* clear out super-block and inode table */
memset_nt(super, 0, journal_data_start);
super->s_size = cpu_to_le64(size);
super->s_blocksize = cpu_to_le32(blocksize);
super->s_magic = cpu_to_le16(PMFS_SUPER_MAGIC);
super->s_journal_offset = cpu_to_le64(journal_meta_start);
super->s_inode_table_offset = cpu_to_le64(inode_table_start);
pmfs_init_blockmap(sb, journal_data_start + sbi->jsize);
pmfs_memlock_range(sb, super, journal_data_start);
if (pmfs_journal_hard_init(sb, journal_data_start, sbi->jsize) < 0) {
printk(KERN_ERR "Journal hard initialization failed\n");
return ERR_PTR(-EINVAL);
}
if (pmfs_init_inode_table(sb) < 0)
return ERR_PTR(-EINVAL);
pmfs_memunlock_range(sb, super, PMFS_SB_SIZE*2);
pmfs_sync_super(super);
pmfs_memlock_range(sb, super, PMFS_SB_SIZE*2);
pmfs_flush_buffer(super, PMFS_SB_SIZE, false);
pmfs_flush_buffer((char *)super + PMFS_SB_SIZE, sizeof(*super), false);
pmfs_new_block(sb, &blocknr, PMFS_BLOCK_TYPE_4K, 1);
root_i = pmfs_get_inode(sb, PMFS_ROOT_INO);
pmfs_memunlock_inode(sb, root_i);
root_i->i_mode = cpu_to_le16(sbi->mode | S_IFDIR);
root_i->i_uid = cpu_to_le32(from_kuid(&init_user_ns, sbi->uid));
root_i->i_gid = cpu_to_le32(from_kgid(&init_user_ns, sbi->gid));
root_i->i_links_count = cpu_to_le16(2);
root_i->i_blk_type = PMFS_BLOCK_TYPE_4K;
root_i->i_flags = 0;
root_i->i_blocks = cpu_to_le64(1);
root_i->i_size = cpu_to_le64(sb->s_blocksize);
root_i->i_atime = root_i->i_mtime = root_i->i_ctime =
cpu_to_le32(get_seconds());
root_i->root = cpu_to_le64(pmfs_get_block_off(sb, blocknr,
PMFS_BLOCK_TYPE_4K));
root_i->height = 0;
/* pmfs_sync_inode(root_i); */
pmfs_memlock_inode(sb, root_i);
pmfs_flush_buffer(root_i, sizeof(*root_i), false);
de = (struct pmfs_direntry *)
pmfs_get_block(sb, pmfs_get_block_off(sb, blocknr, PMFS_BLOCK_TYPE_4K));
pmfs_memunlock_range(sb, de, sb->s_blocksize);
de->ino = cpu_to_le64(PMFS_ROOT_INO);
de->name_len = 1;
de->de_len = cpu_to_le16(PMFS_DIR_REC_LEN(de->name_len));
strcpy(de->name, ".");
pmfs_flush_buffer(de, PMFS_DIR_REC_LEN(1), false);
de = (struct pmfs_direntry *)((char *)de + le16_to_cpu(de->de_len));
de->ino = cpu_to_le64(PMFS_ROOT_INO);
de->de_len = cpu_to_le16(sb->s_blocksize - PMFS_DIR_REC_LEN(1));
de->name_len = 2;
strcpy(de->name, "..");
pmfs_memlock_range(sb, de, sb->s_blocksize);
pmfs_flush_buffer(de, PMFS_DIR_REC_LEN(2), false);
PERSISTENT_MARK();
PERSISTENT_BARRIER();
return root_i;
}
static inline void set_default_opts(struct pmfs_sb_info *sbi)
{
/* set_opt(sbi->s_mount_opt, PROTECT); */
set_opt(sbi->s_mount_opt, HUGEIOREMAP);
set_opt(sbi->s_mount_opt, ERRORS_CONT);
sbi->jsize = PMFS_DEFAULT_JOURNAL_SIZE;
}
static void pmfs_root_check(struct super_block *sb, struct pmfs_inode *root_pi)
{
/*
* if (root_pi->i_d.d_next) {
* pmfs_warn("root->next not NULL, trying to fix\n");
* goto fail1;
* }
*/
if (!S_ISDIR(le16_to_cpu(root_pi->i_mode)))
pmfs_warn("root is not a directory!\n");
#if 0
if (pmfs_calc_checksum((u8 *)root_pi, PMFS_INODE_SIZE)) {
pmfs_dbg("checksum error in root inode, trying to fix\n");
goto fail3;
}
#endif
}
int pmfs_check_integrity(struct super_block *sb,
struct pmfs_super_block *super)
{
struct pmfs_super_block *super_redund;
super_redund =
(struct pmfs_super_block *)((char *)super + PMFS_SB_SIZE);
/* Do sanity checks on the superblock */
if (le16_to_cpu(super->s_magic) != PMFS_SUPER_MAGIC) {
if (le16_to_cpu(super_redund->s_magic) != PMFS_SUPER_MAGIC) {
printk(KERN_ERR "Can't find a valid pmfs partition\n");
goto out;
} else {
pmfs_warn
("Error in super block: try to repair it with "
"the redundant copy");
/* Try to auto-recover the super block */
if (sb)
pmfs_memunlock_super(sb, super);
memcpy(super, super_redund,
sizeof(struct pmfs_super_block));
if (sb)
pmfs_memlock_super(sb, super);
pmfs_flush_buffer(super, sizeof(*super), false);
pmfs_flush_buffer((char *)super + PMFS_SB_SIZE,
sizeof(*super), false);
}
}
/* Read the superblock */
if (pmfs_calc_checksum((u8 *)super, PMFS_SB_STATIC_SIZE(super))) {
if (pmfs_calc_checksum((u8 *)super_redund,
PMFS_SB_STATIC_SIZE(super_redund))) {
printk(KERN_ERR "checksum error in super block\n");
goto out;
} else {
pmfs_warn
("Error in super block: try to repair it with "
"the redundant copy");
/* Try to auto-recover the super block */
if (sb)
pmfs_memunlock_super(sb, super);
memcpy(super, super_redund,
sizeof(struct pmfs_super_block));
if (sb)
pmfs_memlock_super(sb, super);
pmfs_flush_buffer(super, sizeof(*super), false);
pmfs_flush_buffer((char *)super + PMFS_SB_SIZE,
sizeof(*super), false);
}
}
return 1;
out:
return 0;
}
static void pmfs_recover_truncate_list(struct super_block *sb)
{
struct pmfs_inode_truncate_item *head = pmfs_get_truncate_list_head(sb);
u64 ino_next = le64_to_cpu(head->i_next_truncate);
struct pmfs_inode *pi;
struct pmfs_inode_truncate_item *li;
struct inode *inode;
if (ino_next == 0)
return;
while (ino_next != 0) {
pi = pmfs_get_inode(sb, ino_next);
li = (struct pmfs_inode_truncate_item *)(pi + 1);
inode = pmfs_iget(sb, ino_next);
if (IS_ERR(inode))
break;
pmfs_dbg("Recover ino %llx nlink %d sz %llx:%llx\n", ino_next,
inode->i_nlink, pi->i_size, li->i_truncatesize);
if (inode->i_nlink) {
/* set allocation hint */
pmfs_set_blocksize_hint(sb, pi,
le64_to_cpu(li->i_truncatesize));
pmfs_setsize(inode, le64_to_cpu(li->i_truncatesize));
pmfs_update_isize(inode, pi);
} else {
/* free the inode */
pmfs_dbg("deleting unreferenced inode %lx\n",
inode->i_ino);
}
iput(inode);
pmfs_flush_buffer(pi, CACHELINE_SIZE, false);
ino_next = le64_to_cpu(li->i_next_truncate);
}
PERSISTENT_MARK();
PERSISTENT_BARRIER();
/* reset the truncate_list */
pmfs_memunlock_range(sb, head, sizeof(*head));
head->i_next_truncate = 0;
pmfs_memlock_range(sb, head, sizeof(*head));
pmfs_flush_buffer(head, sizeof(*head), false);
PERSISTENT_MARK();
PERSISTENT_BARRIER();
}
static int pmfs_fill_super(struct super_block *sb, void *data, int silent)
{
struct pmfs_super_block *super;
struct pmfs_inode *root_pi;
struct pmfs_sb_info *sbi = NULL;
struct inode *root_i = NULL;
unsigned long blocksize;
u32 random = 0;
int retval = -EINVAL;
BUILD_BUG_ON(sizeof(struct pmfs_super_block) > PMFS_SB_SIZE);
BUILD_BUG_ON(sizeof(struct pmfs_inode) > PMFS_INODE_SIZE);
if (arch_has_pcommit()) {
pmfs_info("arch has PCOMMIT support\n");
support_pcommit = 1;
} else {
pmfs_info("arch does not have PCOMMIT support\n");
}
if (arch_has_clwb()) {
pmfs_info("arch has CLWB support\n");
support_clwb = 1;
} else {
pmfs_info("arch does not have CLWB support\n");
}
sbi = kzalloc(sizeof(struct pmfs_sb_info), GFP_KERNEL);
if (!sbi)
return -ENOMEM;
sb->s_fs_info = sbi;
set_default_opts(sbi);
if (pmfs_get_block_info(sb, sbi))
goto out;
get_random_bytes(&random, sizeof(u32));
atomic_set(&sbi->next_generation, random);
/* Init with default values */
INIT_LIST_HEAD(&sbi->block_inuse_head);
sbi->mode = (S_IRUGO | S_IXUGO | S_IWUSR);
sbi->uid = current_fsuid();
sbi->gid = current_fsgid();
set_opt(sbi->s_mount_opt, XIP);
clear_opt(sbi->s_mount_opt, PROTECT);
set_opt(sbi->s_mount_opt, HUGEIOREMAP);
INIT_LIST_HEAD(&sbi->s_truncate);
mutex_init(&sbi->s_truncate_lock);
mutex_init(&sbi->inode_table_mutex);
mutex_init(&sbi->s_lock);
if (pmfs_parse_options(data, sbi, 0))
goto out;
set_opt(sbi->s_mount_opt, MOUNTING);
/* Init a new pmfs instance */
if (sbi->s_mount_opt & PMFS_MOUNT_FORMAT) {
root_pi = pmfs_init(sb, sbi->initsize);
if (IS_ERR(root_pi))
goto out;
super = pmfs_get_super(sb);
goto setup_sb;
}
pmfs_dbg_verbose("checking physical address 0x%016llx for pmfs image\n",
(u64)sbi->phys_addr);
super = pmfs_get_super(sb);
if (pmfs_journal_soft_init(sb)) {
retval = -EINVAL;
printk(KERN_ERR "Journal initialization failed\n");
goto out;
}
if (pmfs_recover_journal(sb)) {
retval = -EINVAL;
printk(KERN_ERR "Journal recovery failed\n");
goto out;
}
if (pmfs_check_integrity(sb, super) == 0) {
pmfs_dbg("Memory contains invalid pmfs %x:%x\n",
le16_to_cpu(super->s_magic), PMFS_SUPER_MAGIC);
goto out;
}
blocksize = le32_to_cpu(super->s_blocksize);
pmfs_set_blocksize(sb, blocksize);
pmfs_dbg_verbose("blocksize %lu\n", blocksize);
/* Read the root inode */
root_pi = pmfs_get_inode(sb, PMFS_ROOT_INO);
/* Check that the root inode is in a sane state */
pmfs_root_check(sb, root_pi);
#ifdef CONFIG_PMFS_TEST
if (!first_pmfs_super)
first_pmfs_super = sbi->virt_addr;
#endif
/* Set it all up.. */
setup_sb:
sb->s_magic = le16_to_cpu(super->s_magic);
sb->s_op = &pmfs_sops;
sb->s_maxbytes = pmfs_max_size(sb->s_blocksize_bits);
sb->s_time_gran = 1;
sb->s_export_op = &pmfs_export_ops;
sb->s_xattr = NULL;
sb->s_flags |= MS_NOSEC;
root_i = pmfs_iget(sb, PMFS_ROOT_INO);
if (IS_ERR(root_i)) {
retval = PTR_ERR(root_i);
goto out;
}
sb->s_root = d_make_root(root_i);
if (!sb->s_root) {
printk(KERN_ERR "get pmfs root inode failed\n");
retval = -ENOMEM;
goto out;
}
pmfs_recover_truncate_list(sb);
/* If the FS was not formatted on this mount, scan the meta-data after
* truncate list has been processed */
if ((sbi->s_mount_opt & PMFS_MOUNT_FORMAT) == 0)
pmfs_setup_blocknode_map(sb);
if (!(sb->s_flags & MS_RDONLY)) {
u64 mnt_write_time;
/* update mount time and write time atomically. */
mnt_write_time = (get_seconds() & 0xFFFFFFFF);
mnt_write_time = mnt_write_time | (mnt_write_time << 32);
pmfs_memunlock_range(sb, &super->s_mtime, 8);
pmfs_memcpy_atomic(&super->s_mtime, &mnt_write_time, 8);
pmfs_memlock_range(sb, &super->s_mtime, 8);
pmfs_flush_buffer(&super->s_mtime, 8, false);
PERSISTENT_MARK();
PERSISTENT_BARRIER();
}
clear_opt(sbi->s_mount_opt, MOUNTING);
retval = 0;
return retval;
out:
kfree(sbi);
return retval;
}
int pmfs_statfs(struct dentry *d, struct kstatfs *buf)
{
struct super_block *sb = d->d_sb;
unsigned long count = 0;
struct pmfs_sb_info *sbi = (struct pmfs_sb_info *)sb->s_fs_info;
buf->f_type = PMFS_SUPER_MAGIC;
buf->f_bsize = sb->s_blocksize;
count = sbi->block_end;
buf->f_blocks = sbi->block_end;
buf->f_bfree = buf->f_bavail = pmfs_count_free_blocks(sb);
buf->f_files = (sbi->s_inodes_count);
buf->f_ffree = (sbi->s_free_inodes_count);
buf->f_namelen = PMFS_NAME_LEN;
pmfs_dbg_verbose("pmfs_stats: total 4k free blocks 0x%llx\n",
buf->f_bfree);
pmfs_dbg_verbose("total inodes 0x%x, free inodes 0x%x, "
"blocknodes 0x%lx\n", (sbi->s_inodes_count),
(sbi->s_free_inodes_count), (sbi->num_blocknode_allocated));
return 0;
}
static int pmfs_show_options(struct seq_file *seq, struct dentry *root)
{
struct pmfs_sb_info *sbi = PMFS_SB(root->d_sb);
seq_printf(seq, ",physaddr=0x%016llx", (u64)sbi->phys_addr);
if (sbi->initsize)
seq_printf(seq, ",init=%luk", sbi->initsize >> 10);
if (sbi->blocksize)
seq_printf(seq, ",bs=%lu", sbi->blocksize);
if (sbi->bpi)
seq_printf(seq, ",bpi=%lu", sbi->bpi);
if (sbi->num_inodes)
seq_printf(seq, ",N=%lu", sbi->num_inodes);
if (sbi->mode != (S_IRWXUGO | S_ISVTX))
seq_printf(seq, ",mode=%03o", sbi->mode);
if (uid_valid(sbi->uid))
seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->uid));
if (gid_valid(sbi->gid))
seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->gid));
if (test_opt(root->d_sb, ERRORS_RO))
seq_puts(seq, ",errors=remount-ro");
if (test_opt(root->d_sb, ERRORS_PANIC))
seq_puts(seq, ",errors=panic");
/* memory protection disabled by default */
if (test_opt(root->d_sb, PROTECT))
seq_puts(seq, ",wprotect");
if (test_opt(root->d_sb, HUGEMMAP))
seq_puts(seq, ",hugemmap");
if (test_opt(root->d_sb, HUGEIOREMAP))
seq_puts(seq, ",hugeioremap");
/* xip not enabled by default */
if (test_opt(root->d_sb, XIP))
seq_puts(seq, ",xip");
return 0;
}
int pmfs_remount(struct super_block *sb, int *mntflags, char *data)
{
unsigned long old_sb_flags;
unsigned long old_mount_opt;
struct pmfs_super_block *ps;
struct pmfs_sb_info *sbi = PMFS_SB(sb);
int ret = -EINVAL;
/* Store the old options */
mutex_lock(&sbi->s_lock);
old_sb_flags = sb->s_flags;
old_mount_opt = sbi->s_mount_opt;
if (pmfs_parse_options(data, sbi, 1))
goto restore_opt;
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
((sbi->s_mount_opt & PMFS_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
if ((*mntflags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
u64 mnt_write_time;
ps = pmfs_get_super(sb);
/* update mount time and write time atomically. */
mnt_write_time = (get_seconds() & 0xFFFFFFFF);
mnt_write_time = mnt_write_time | (mnt_write_time << 32);
pmfs_memunlock_range(sb, &ps->s_mtime, 8);
pmfs_memcpy_atomic(&ps->s_mtime, &mnt_write_time, 8);
pmfs_memlock_range(sb, &ps->s_mtime, 8);
pmfs_flush_buffer(&ps->s_mtime, 8, false);
PERSISTENT_MARK();
PERSISTENT_BARRIER();
}
mutex_unlock(&sbi->s_lock);
ret = 0;
return ret;
restore_opt:
sb->s_flags = old_sb_flags;
sbi->s_mount_opt = old_mount_opt;
mutex_unlock(&sbi->s_lock);
return ret;
}
static void pmfs_put_super(struct super_block *sb)
{
struct pmfs_sb_info *sbi = PMFS_SB(sb);
struct pmfs_blocknode *i;
struct list_head *head = &(sbi->block_inuse_head);
#ifdef CONFIG_PMFS_TEST
if (first_pmfs_super == sbi->virt_addr)
first_pmfs_super = NULL;
#endif
/* It's unmount time, so unmap the pmfs memory */
if (sbi->virt_addr) {
pmfs_save_blocknode_mappings(sb);
pmfs_journal_uninit(sb);
sbi->virt_addr = NULL;
}
/* Free all the pmfs_blocknodes */
while (!list_empty(head)) {
i = list_first_entry(head, struct pmfs_blocknode, link);
list_del(&i->link);
pmfs_free_blocknode(sb, i);
}
sb->s_fs_info = NULL;
pmfs_dbgmask = 0;
kfree(sbi);
}
inline void pmfs_free_transaction(pmfs_transaction_t *trans)
{
kmem_cache_free(pmfs_transaction_cachep, trans);
}
void __pmfs_free_blocknode(struct pmfs_blocknode *bnode)
{
kmem_cache_free(pmfs_blocknode_cachep, bnode);
}
void pmfs_free_blocknode(struct super_block *sb, struct pmfs_blocknode *bnode)
{
struct pmfs_sb_info *sbi = PMFS_SB(sb);
sbi->num_blocknode_allocated--;
__pmfs_free_blocknode(bnode);
}
inline pmfs_transaction_t *pmfs_alloc_transaction(void)
{
return (pmfs_transaction_t *)
kmem_cache_alloc(pmfs_transaction_cachep, GFP_NOFS);
}
struct pmfs_blocknode *pmfs_alloc_blocknode(struct super_block *sb)
{
struct pmfs_blocknode *p;
struct pmfs_sb_info *sbi = PMFS_SB(sb);
p = (struct pmfs_blocknode *)
kmem_cache_alloc(pmfs_blocknode_cachep, GFP_NOFS);
if (p) {
sbi->num_blocknode_allocated++;
}
return p;
}
static struct inode *pmfs_alloc_inode(struct super_block *sb)
{
struct pmfs_inode_info *vi;
vi = kmem_cache_alloc(pmfs_inode_cachep, GFP_NOFS);
if (!vi)
return NULL;
// vi->vfs_inode.i_version = 1;
return &vi->vfs_inode;
}
static void pmfs_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
kmem_cache_free(pmfs_inode_cachep, PMFS_I(inode));
}
static void pmfs_destroy_inode(struct inode *inode)
{
call_rcu(&inode->i_rcu, pmfs_i_callback);
}
static void init_once(void *foo)
{
struct pmfs_inode_info *vi = foo;
vi->i_dir_start_lookup = 0;
INIT_LIST_HEAD(&vi->i_truncated);
inode_init_once(&vi->vfs_inode);
}
static int __init init_blocknode_cache(void)
{
pmfs_blocknode_cachep = kmem_cache_create("pmfs_blocknode_cache",
sizeof(struct pmfs_blocknode),
0, (SLAB_RECLAIM_ACCOUNT |
SLAB_MEM_SPREAD), NULL);
if (pmfs_blocknode_cachep == NULL)
return -ENOMEM;
return 0;
}
static int __init init_inodecache(void)
{
pmfs_inode_cachep = kmem_cache_create("pmfs_inode_cache",
sizeof(struct pmfs_inode_info),
0, (SLAB_RECLAIM_ACCOUNT |
SLAB_MEM_SPREAD), init_once);
if (pmfs_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
static int __init init_transaction_cache(void)
{
pmfs_transaction_cachep = kmem_cache_create("pmfs_journal_transaction",
sizeof(pmfs_transaction_t), 0, (SLAB_RECLAIM_ACCOUNT |
SLAB_MEM_SPREAD), NULL);
if (pmfs_transaction_cachep == NULL) {
pmfs_dbg("PMFS: failed to init transaction cache\n");
return -ENOMEM;
}
return 0;
}
static void destroy_transaction_cache(void)
{
if (pmfs_transaction_cachep)
kmem_cache_destroy(pmfs_transaction_cachep);
pmfs_transaction_cachep = NULL;
}