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inode.c
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inode.c
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/*
* BRIEF DESCRIPTION
*
* Inode methods (allocate/free/read/write).
*
* Copyright 2015-2016 Regents of the University of California,
* UCSD Non-Volatile Systems Lab, Andiry Xu <[email protected]>
* 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/fs.h>
#include <linux/aio.h>
#include <linux/highuid.h>
#include <linux/module.h>
#include <linux/mpage.h>
#include <linux/backing-dev.h>
#include <linux/types.h>
#include <linux/ratelimit.h>
#include "nova.h"
unsigned int blk_type_to_shift[NOVA_BLOCK_TYPE_MAX] = {12, 21, 30};
uint32_t blk_type_to_size[NOVA_BLOCK_TYPE_MAX] = {0x1000, 0x200000, 0x40000000};
int nova_init_inode_inuse_list(struct super_block *sb)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct nova_range_node *range_node;
struct inode_map *inode_map;
unsigned long range_high;
int i;
int ret;
sbi->s_inodes_used_count = NOVA_NORMAL_INODE_START;
range_high = (NOVA_NORMAL_INODE_START - 1) / sbi->cpus;
if (NOVA_NORMAL_INODE_START % sbi->cpus)
range_high++;
for (i = 0; i < sbi->cpus; i++) {
inode_map = &sbi->inode_maps[i];
range_node = nova_alloc_inode_node(sb);
if (range_node == NULL)
/* FIXME: free allocated memories */
return -ENOMEM;
range_node->range_low = 0;
range_node->range_high = range_high;
ret = nova_insert_inodetree(sbi, range_node, i);
if (ret) {
nova_err(sb, "%s failed\n", __func__);
nova_free_inode_node(sb, range_node);
return ret;
}
inode_map->num_range_node_inode = 1;
inode_map->first_inode_range = range_node;
}
return 0;
}
int nova_init_inode_table(struct super_block *sb)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct inode_table *inode_table;
struct nova_inode *pi = nova_get_inode_by_ino(sb, NOVA_INODETABLE_INO);
unsigned long blocknr;
u64 block;
int allocated;
int i;
pi->i_mode = 0;
pi->i_uid = 0;
pi->i_gid = 0;
pi->i_links_count = cpu_to_le16(1);
pi->i_flags = 0;
pi->nova_ino = NOVA_INODETABLE_INO;
pi->i_blk_type = NOVA_BLOCK_TYPE_2M;
for (i = 0; i < sbi->cpus; i++) {
inode_table = nova_get_inode_table(sb, i);
if (!inode_table)
return -EINVAL;
allocated = nova_new_log_blocks(sb, pi, &blocknr, 1, 1);
nova_dbg_verbose("%s: allocate log @ 0x%lx\n", __func__,
blocknr);
if (allocated != 1 || blocknr == 0)
return -ENOSPC;
block = nova_get_block_off(sb, blocknr, NOVA_BLOCK_TYPE_2M);
inode_table->log_head = block;
nova_flush_buffer(inode_table, CACHELINE_SIZE, 0);
}
PERSISTENT_BARRIER();
return 0;
}
int nova_get_inode_address(struct super_block *sb, u64 ino,
u64 *pi_addr, int extendable)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct nova_inode *pi;
struct inode_table *inode_table;
unsigned int data_bits;
unsigned int num_inodes_bits;
u64 curr;
unsigned int superpage_count;
u64 internal_ino;
int cpuid;
unsigned int index;
unsigned int i = 0;
unsigned long blocknr;
unsigned long curr_addr;
int allocated;
pi = nova_get_inode_by_ino(sb, NOVA_INODETABLE_INO);
data_bits = blk_type_to_shift[pi->i_blk_type];
num_inodes_bits = data_bits - NOVA_INODE_BITS;
cpuid = ino % sbi->cpus;
internal_ino = ino / sbi->cpus;
inode_table = nova_get_inode_table(sb, cpuid);
superpage_count = internal_ino >> num_inodes_bits;
index = internal_ino & ((1 << num_inodes_bits) - 1);
curr = inode_table->log_head;
if (curr == 0)
return -EINVAL;
for (i = 0; i < superpage_count; i++) {
if (curr == 0)
return -EINVAL;
curr_addr = (unsigned long)nova_get_block(sb, curr);
/* Next page pointer in the last 8 bytes of the superpage */
curr_addr += 2097152 - 8;
curr = *(u64 *)(curr_addr);
if (curr == 0) {
if (extendable == 0)
return -EINVAL;
allocated = nova_new_log_blocks(sb, pi, &blocknr,
1, 1);
if (allocated != 1)
return allocated;
curr = nova_get_block_off(sb, blocknr,
NOVA_BLOCK_TYPE_2M);
*(u64 *)(curr_addr) = curr;
nova_flush_buffer((void *)curr_addr,
NOVA_INODE_SIZE, 1);
}
}
*pi_addr = curr + index * NOVA_INODE_SIZE;
return 0;
}
static inline int nova_free_contiguous_data_blocks(struct super_block *sb,
struct nova_inode_info_header *sih, struct nova_inode *pi,
struct nova_file_write_entry *entry, unsigned long pgoff,
unsigned long num_pages, unsigned long *start_blocknr,
unsigned long *num_free)
{
int freed = 0;
unsigned long nvmm;
if (entry->num_pages < entry->invalid_pages + num_pages) {
nova_err(sb, "%s: inode %lu, entry pgoff %llu, %llu pages, "
"invalid %llu, try to free %lu, pgoff %lu\n",
__func__, sih->ino, entry->pgoff,
entry->num_pages, entry->invalid_pages,
num_pages, pgoff);
return freed;
}
entry->invalid_pages += num_pages;
nvmm = get_nvmm(sb, sih, entry, pgoff);
if (*start_blocknr == 0) {
*start_blocknr = nvmm;
*num_free = num_pages;
} else {
if (nvmm == *start_blocknr + *num_free) {
(*num_free) += num_pages;
} else {
/* A new start */
nova_free_data_blocks(sb, pi, *start_blocknr,
*num_free);
freed = *num_free;
*start_blocknr = nvmm;
*num_free = num_pages;
}
}
return freed;
}
static int nova_free_contiguous_log_blocks(struct super_block *sb,
struct nova_inode *pi, u64 head)
{
struct nova_inode_log_page *curr_page;
unsigned long blocknr, start_blocknr = 0;
u64 curr_block = head;
u32 btype = pi->i_blk_type;
int num_free = 0;
int freed = 0;
while (curr_block) {
if (curr_block & INVALID_MASK) {
nova_dbg("%s: ERROR: invalid block %llu\n",
__func__, curr_block);
break;
}
curr_page = (struct nova_inode_log_page *)nova_get_block(sb,
curr_block);
blocknr = nova_get_blocknr(sb, le64_to_cpu(curr_block),
btype);
nova_dbg_verbose("%s: free page %llu\n", __func__, curr_block);
curr_block = curr_page->page_tail.next_page;
if (start_blocknr == 0) {
start_blocknr = blocknr;
num_free = 1;
} else {
if (blocknr == start_blocknr + num_free) {
num_free++;
} else {
/* A new start */
nova_free_log_blocks(sb, pi, start_blocknr,
num_free);
freed += num_free;
start_blocknr = blocknr;
num_free = 1;
}
}
}
if (start_blocknr) {
nova_free_log_blocks(sb, pi, start_blocknr, num_free);
freed += num_free;
}
return freed;
}
static int nova_delete_cache_tree(struct super_block *sb,
struct nova_inode *pi, struct nova_inode_info_header *sih,
unsigned long start_blocknr, unsigned long last_blocknr)
{
unsigned long addr;
unsigned long i;
int deleted = 0;
void *ret;
nova_dbgv("%s: inode %lu, mmap pages %lu, start %lu, last %lu\n",
__func__, sih->ino, sih->mmap_pages,
start_blocknr, last_blocknr);
for (i = start_blocknr; i <= last_blocknr; i++) {
addr = (unsigned long)radix_tree_lookup(&sih->cache_tree, i);
if (addr) {
ret = radix_tree_delete(&sih->cache_tree, i);
nova_free_data_blocks(sb, pi, addr >> PAGE_SHIFT, 1);
sih->mmap_pages--;
deleted++;
}
}
nova_dbgv("%s: inode %lu, deleted mmap pages %d\n",
__func__, sih->ino, deleted);
if (sih->mmap_pages == 0) {
sih->low_dirty = ULONG_MAX;
sih->high_dirty = 0;
}
return 0;
}
static int nova_zero_cache_tree(struct super_block *sb,
struct nova_inode *pi, struct nova_inode_info_header *sih,
unsigned long start_blocknr)
{
unsigned long block;
unsigned long i;
void *addr;
nova_dbgv("%s: inode %lu, mmap pages %lu, start %lu, last %lu, "
"size %lu", __func__, sih->ino, sih->mmap_pages,
start_blocknr, sih->high_dirty, sih->i_size);
for (i = start_blocknr; i <= sih->high_dirty; i++) {
block = (unsigned long)radix_tree_lookup(&sih->cache_tree, i);
if (block) {
addr = nova_get_block(sb, block);
memset(addr, 0, PAGE_SIZE);
}
}
return 0;
}
int nova_delete_file_tree(struct super_block *sb,
struct nova_inode_info_header *sih, unsigned long start_blocknr,
unsigned long last_blocknr, bool delete_nvmm, bool delete_mmap)
{
struct nova_file_write_entry *entry;
struct nova_inode *pi;
unsigned long free_blocknr = 0, num_free = 0;
unsigned long pgoff = start_blocknr;
timing_t delete_time;
int freed = 0;
void *ret;
pi = (struct nova_inode *)nova_get_block(sb, sih->pi_addr);
NOVA_START_TIMING(delete_file_tree_t, delete_time);
if (delete_mmap && sih->mmap_pages)
nova_delete_cache_tree(sb, pi, sih, start_blocknr,
last_blocknr);
if (sih->mmap_pages && start_blocknr <= sih->high_dirty)
nova_zero_cache_tree(sb, pi, sih, start_blocknr);
pgoff = start_blocknr;
while (pgoff <= last_blocknr) {
entry = radix_tree_lookup(&sih->tree, pgoff);
if (entry) {
ret = radix_tree_delete(&sih->tree, pgoff);
BUG_ON(!ret || ret != entry);
if (delete_nvmm)
freed += nova_free_contiguous_data_blocks(sb,
sih, pi, entry, pgoff, 1,
&free_blocknr, &num_free);
pgoff++;
} else {
/* We are finding a hole. Jump to the next entry. */
entry = nova_find_next_entry(sb, sih, pgoff);
if (!entry)
break;
pgoff++;
pgoff = pgoff > entry->pgoff ? pgoff : entry->pgoff;
}
}
if (free_blocknr) {
nova_free_data_blocks(sb, pi, free_blocknr, num_free);
freed += num_free;
}
NOVA_END_TIMING(delete_file_tree_t, delete_time);
nova_dbgv("Inode %llu: delete file tree from pgoff %lu to %lu, "
"%d blocks freed\n",
pi->nova_ino, start_blocknr, last_blocknr, freed);
return freed;
}
static int nova_free_dram_resource(struct super_block *sb,
struct nova_inode_info_header *sih)
{
unsigned long last_blocknr;
int freed = 0;
if (!(S_ISREG(sih->i_mode)) && !(S_ISDIR(sih->i_mode)))
return 0;
if (S_ISREG(sih->i_mode)) {
last_blocknr = nova_get_last_blocknr(sb, sih);
freed = nova_delete_file_tree(sb, sih, 0,
last_blocknr, false, true);
} else {
nova_delete_dir_tree(sb, sih);
freed = 1;
}
return freed;
}
/*
* Free data blocks from inode in the range start <=> end
*/
static void nova_truncate_file_blocks(struct inode *inode, loff_t start,
loff_t end)
{
struct super_block *sb = inode->i_sb;
struct nova_inode *pi = nova_get_inode(sb, inode);
struct nova_inode_info *si = NOVA_I(inode);
struct nova_inode_info_header *sih = &si->header;
unsigned int data_bits = blk_type_to_shift[pi->i_blk_type];
unsigned long first_blocknr, last_blocknr;
int freed = 0;
inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
nova_dbg_verbose("truncate: pi %p iblocks %llx %llx %llx %llx\n", pi,
pi->i_blocks, start, end, pi->i_size);
first_blocknr = (start + (1UL << data_bits) - 1) >> data_bits;
if (end == 0)
return;
last_blocknr = (end - 1) >> data_bits;
if (first_blocknr > last_blocknr)
return;
freed = nova_delete_file_tree(sb, sih, first_blocknr,
last_blocknr, 1, 0);
inode->i_blocks -= (freed * (1 << (data_bits -
sb->s_blocksize_bits)));
pi->i_blocks = cpu_to_le64(inode->i_blocks);
/* Check for the flag EOFBLOCKS is still valid after the set size */
check_eof_blocks(sb, pi, inode->i_size);
return;
}
struct nova_file_write_entry *nova_find_next_entry(struct super_block *sb,
struct nova_inode_info_header *sih, pgoff_t pgoff)
{
struct nova_file_write_entry *entry = NULL;
struct nova_file_write_entry *entries[1];
int nr_entries;
nr_entries = radix_tree_gang_lookup(&sih->tree,
(void **)entries, pgoff, 1);
if (nr_entries == 1)
entry = entries[0];
return entry;
}
/* search the radix tree to find hole or data
* in the specified range
* Input:
* first_blocknr: first block in the specified range
* last_blocknr: last_blocknr in the specified range
* @data_found: indicates whether data blocks were found
* @hole_found: indicates whether a hole was found
* hole: whether we are looking for a hole or data
*/
static int nova_lookup_hole_in_range(struct super_block *sb,
struct nova_inode_info_header *sih,
unsigned long first_blocknr, unsigned long last_blocknr,
int *data_found, int *hole_found, int hole)
{
struct nova_file_write_entry *entry;
unsigned long blocks = 0;
unsigned long pgoff, old_pgoff;
pgoff = first_blocknr;
while (pgoff <= last_blocknr) {
old_pgoff = pgoff;
entry = radix_tree_lookup(&sih->tree, pgoff);
if (entry) {
*data_found = 1;
if (!hole)
goto done;
pgoff++;
} else {
*hole_found = 1;
entry = nova_find_next_entry(sb, sih, pgoff);
pgoff++;
if (entry) {
pgoff = pgoff > entry->pgoff ?
pgoff : entry->pgoff;
if (pgoff > last_blocknr)
pgoff = last_blocknr + 1;
}
}
if (!*hole_found || !hole)
blocks += pgoff - old_pgoff;
}
done:
return blocks;
}
int nova_assign_write_entry(struct super_block *sb,
struct nova_inode *pi,
struct nova_inode_info_header *sih,
struct nova_file_write_entry *entry,
bool free)
{
struct nova_file_write_entry *old_entry;
void **pentry;
unsigned long old_nvmm;
unsigned long start_pgoff = entry->pgoff;
unsigned int num = entry->num_pages;
unsigned long curr_pgoff;
int i;
int ret;
timing_t assign_time;
NOVA_START_TIMING(assign_t, assign_time);
for (i = 0; i < num; i++) {
curr_pgoff = start_pgoff + i;
pentry = radix_tree_lookup_slot(&sih->tree, curr_pgoff);
if (pentry) {
old_entry = radix_tree_deref_slot(pentry);
old_nvmm = get_nvmm(sb, sih, old_entry, curr_pgoff);
if (free) {
old_entry->invalid_pages++;
nova_free_data_blocks(sb, pi, old_nvmm, 1);
pi->i_blocks--;
}
radix_tree_replace_slot(pentry, entry);
} else {
ret = radix_tree_insert(&sih->tree, curr_pgoff, entry);
if (ret) {
nova_dbg("%s: ERROR %d\n", __func__, ret);
goto out;
}
}
}
out:
NOVA_END_TIMING(assign_t, assign_time);
return ret;
}
static int nova_read_inode(struct super_block *sb, struct inode *inode,
u64 pi_addr)
{
struct nova_inode_info *si = NOVA_I(inode);
struct nova_inode *pi;
struct nova_inode_info_header *sih = &si->header;
int ret = -EIO;
unsigned long ino;
pi = (struct nova_inode *)nova_get_block(sb, pi_addr);
inode->i_mode = sih->i_mode;
i_uid_write(inode, le32_to_cpu(pi->i_uid));
i_gid_write(inode, le32_to_cpu(pi->i_gid));
// set_nlink(inode, le16_to_cpu(pi->i_links_count));
inode->i_generation = le32_to_cpu(pi->i_generation);
nova_set_inode_flags(inode, pi, le32_to_cpu(pi->i_flags));
ino = inode->i_ino;
/* check if the inode is active. */
if (inode->i_mode == 0 || pi->valid == 0) {
/* this inode is deleted */
ret = -ESTALE;
goto bad_inode;
}
inode->i_blocks = le64_to_cpu(pi->i_blocks);
inode->i_mapping->a_ops = &nova_aops_dax;
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
inode->i_op = &nova_file_inode_operations;
inode->i_fop = &nova_dax_file_operations;
break;
case S_IFDIR:
inode->i_op = &nova_dir_inode_operations;
inode->i_fop = &nova_dir_operations;
break;
case S_IFLNK:
inode->i_op = &nova_symlink_inode_operations;
break;
default:
inode->i_op = &nova_special_inode_operations;
init_special_inode(inode, inode->i_mode,
le32_to_cpu(pi->dev.rdev));
break;
}
/* Update size and time after rebuild the tree */
inode->i_size = le64_to_cpu(sih->i_size);
inode->i_atime.tv_sec = le32_to_cpu(pi->i_atime);
inode->i_ctime.tv_sec = le32_to_cpu(pi->i_ctime);
inode->i_mtime.tv_sec = le32_to_cpu(pi->i_mtime);
inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec =
inode->i_ctime.tv_nsec = 0;
set_nlink(inode, le16_to_cpu(pi->i_links_count));
return 0;
bad_inode:
make_bad_inode(inode);
return ret;
}
static void nova_get_inode_flags(struct inode *inode, struct nova_inode *pi)
{
unsigned int flags = inode->i_flags;
unsigned int nova_flags = le32_to_cpu(pi->i_flags);
nova_flags &= ~(FS_SYNC_FL | FS_APPEND_FL | FS_IMMUTABLE_FL |
FS_NOATIME_FL | FS_DIRSYNC_FL);
if (flags & S_SYNC)
nova_flags |= FS_SYNC_FL;
if (flags & S_APPEND)
nova_flags |= FS_APPEND_FL;
if (flags & S_IMMUTABLE)
nova_flags |= FS_IMMUTABLE_FL;
if (flags & S_NOATIME)
nova_flags |= FS_NOATIME_FL;
if (flags & S_DIRSYNC)
nova_flags |= FS_DIRSYNC_FL;
pi->i_flags = cpu_to_le32(nova_flags);
}
static void nova_update_inode(struct inode *inode, struct nova_inode *pi)
{
nova_memunlock_inode(inode->i_sb, pi);
pi->i_mode = cpu_to_le16(inode->i_mode);
pi->i_uid = cpu_to_le32(i_uid_read(inode));
pi->i_gid = cpu_to_le32(i_gid_read(inode));
pi->i_links_count = cpu_to_le16(inode->i_nlink);
pi->i_size = cpu_to_le64(inode->i_size);
pi->i_blocks = cpu_to_le64(inode->i_blocks);
pi->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
pi->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
pi->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
pi->i_generation = cpu_to_le32(inode->i_generation);
nova_get_inode_flags(inode, pi);
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
pi->dev.rdev = cpu_to_le32(inode->i_rdev);
nova_memlock_inode(inode->i_sb, pi);
}
static int nova_alloc_unused_inode(struct super_block *sb, int cpuid,
unsigned long *ino)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct inode_map *inode_map;
struct nova_range_node *i, *next_i;
struct rb_node *temp, *next;
unsigned long next_range_low;
unsigned long new_ino;
unsigned long MAX_INODE = 1UL << 31;
inode_map = &sbi->inode_maps[cpuid];
i = inode_map->first_inode_range;
NOVA_ASSERT(i);
temp = &i->node;
next = rb_next(temp);
if (!next) {
next_i = NULL;
next_range_low = MAX_INODE;
} else {
next_i = container_of(next, struct nova_range_node, node);
next_range_low = next_i->range_low;
}
new_ino = i->range_high + 1;
if (next_i && new_ino == (next_range_low - 1)) {
/* Fill the gap completely */
i->range_high = next_i->range_high;
rb_erase(&next_i->node, &inode_map->inode_inuse_tree);
nova_free_inode_node(sb, next_i);
inode_map->num_range_node_inode--;
} else if (new_ino < (next_range_low - 1)) {
/* Aligns to left */
i->range_high = new_ino;
} else {
nova_dbg("%s: ERROR: new ino %lu, next low %lu\n", __func__,
new_ino, next_range_low);
return -ENOSPC;
}
*ino = new_ino * sbi->cpus + cpuid;
sbi->s_inodes_used_count++;
inode_map->allocated++;
nova_dbg_verbose("Alloc ino %lu\n", *ino);
return 0;
}
static int nova_free_inuse_inode(struct super_block *sb, unsigned long ino)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct inode_map *inode_map;
struct nova_range_node *i = NULL;
struct nova_range_node *curr_node;
int found = 0;
int cpuid = ino % sbi->cpus;
unsigned long internal_ino = ino / sbi->cpus;
int ret = 0;
nova_dbg_verbose("Free inuse ino: %lu\n", ino);
inode_map = &sbi->inode_maps[cpuid];
mutex_lock(&inode_map->inode_table_mutex);
found = nova_search_inodetree(sbi, ino, &i);
if (!found) {
nova_dbg("%s ERROR: ino %lu not found\n", __func__, ino);
mutex_unlock(&inode_map->inode_table_mutex);
return -EINVAL;
}
if ((internal_ino == i->range_low) && (internal_ino == i->range_high)) {
/* fits entire node */
rb_erase(&i->node, &inode_map->inode_inuse_tree);
nova_free_inode_node(sb, i);
inode_map->num_range_node_inode--;
goto block_found;
}
if ((internal_ino == i->range_low) && (internal_ino < i->range_high)) {
/* Aligns left */
i->range_low = internal_ino + 1;
goto block_found;
}
if ((internal_ino > i->range_low) && (internal_ino == i->range_high)) {
/* Aligns right */
i->range_high = internal_ino - 1;
goto block_found;
}
if ((internal_ino > i->range_low) && (internal_ino < i->range_high)) {
/* Aligns somewhere in the middle */
curr_node = nova_alloc_inode_node(sb);
NOVA_ASSERT(curr_node);
if (curr_node == NULL) {
/* returning without freeing the block */
goto block_found;
}
curr_node->range_low = internal_ino + 1;
curr_node->range_high = i->range_high;
i->range_high = internal_ino - 1;
ret = nova_insert_inodetree(sbi, curr_node, cpuid);
if (ret) {
nova_free_inode_node(sb, curr_node);
goto err;
}
inode_map->num_range_node_inode++;
goto block_found;
}
err:
nova_error_mng(sb, "Unable to free inode %lu\n", ino);
nova_error_mng(sb, "Found inuse block %lu - %lu\n",
i->range_low, i->range_high);
mutex_unlock(&inode_map->inode_table_mutex);
return ret;
block_found:
sbi->s_inodes_used_count--;
inode_map->freed++;
mutex_unlock(&inode_map->inode_table_mutex);
return ret;
}
/*
* NOTE! When we get the inode, we're the only people
* that have access to it, and as such there are no
* race conditions we have to worry about. The inode
* is not on the hash-lists, and it cannot be reached
* through the filesystem because the directory entry
* has been deleted earlier.
*/
static int nova_free_inode(struct inode *inode,
struct nova_inode_info_header *sih)
{
struct super_block *sb = inode->i_sb;
struct nova_inode *pi;
int err = 0;
timing_t free_time;
NOVA_START_TIMING(free_inode_t, free_time);
pi = nova_get_inode(sb, inode);
if (pi->valid) {
nova_dbg("%s: inode %lu still valid\n",
__func__, inode->i_ino);
pi->valid = 0;
}
if (pi->nova_ino != inode->i_ino) {
nova_err(sb, "%s: inode %lu ino does not match: %llu\n",
__func__, inode->i_ino, pi->nova_ino);
nova_dbg("inode size %llu, pi addr 0x%lx, pi head 0x%llx, "
"tail 0x%llx, mode %u\n",
inode->i_size, sih->pi_addr, pi->log_head,
pi->log_tail, pi->i_mode);
nova_dbg("sih: ino %lu, inode size %lu, mode %u, "
"inode mode %u\n", sih->ino, sih->i_size,
sih->i_mode, inode->i_mode);
nova_print_inode_log(sb, inode);
}
nova_free_inode_log(sb, pi);
pi->i_blocks = 0;
sih->log_pages = 0;
sih->i_mode = 0;
sih->pi_addr = 0;
sih->i_size = 0;
err = nova_free_inuse_inode(sb, pi->nova_ino);
NOVA_END_TIMING(free_inode_t, free_time);
return err;
}
struct inode *nova_iget(struct super_block *sb, unsigned long ino)
{
struct nova_inode_info *si;
struct inode *inode;
u64 pi_addr;
int err;
inode = iget_locked(sb, ino);
if (unlikely(!inode))
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
return inode;
si = NOVA_I(inode);
nova_dbgv("%s: inode %lu\n", __func__, ino);
if (ino == NOVA_ROOT_INO) {
pi_addr = NOVA_ROOT_INO_START;
} else {
err = nova_get_inode_address(sb, ino, &pi_addr, 0);
if (err) {
nova_dbg("%s: get inode %lu address failed %d\n",
__func__, ino, err);
goto fail;
}
}
if (pi_addr == 0) {
err = -EACCES;
goto fail;
}
err = nova_rebuild_inode(sb, si, pi_addr);
if (err)
goto fail;
err = nova_read_inode(sb, inode, pi_addr);
if (unlikely(err))
goto fail;
inode->i_ino = ino;
unlock_new_inode(inode);
return inode;
fail:
iget_failed(inode);
return ERR_PTR(err);
}
unsigned long nova_get_last_blocknr(struct super_block *sb,
struct nova_inode_info_header *sih)
{
struct nova_inode *pi;
unsigned long last_blocknr;
unsigned int btype;
unsigned int data_bits;
pi = nova_get_block(sb, sih->pi_addr);
btype = pi->i_blk_type;
data_bits = blk_type_to_shift[btype];
if (sih->i_size == 0)
last_blocknr = 0;
else
last_blocknr = (sih->i_size - 1) >> data_bits;
return last_blocknr;
}
void nova_evict_inode(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct nova_inode *pi = nova_get_inode(sb, inode);
struct nova_inode_info *si = NOVA_I(inode);
struct nova_inode_info_header *sih = &si->header;
unsigned long last_blocknr;
timing_t evict_time;
int err = 0;
int freed = 0;
int destroy = 0;
if (!sih) {
nova_err(sb, "%s: ino %lu sih is NULL!\n",
__func__, inode->i_ino);
NOVA_ASSERT(0);
goto out;
}
NOVA_START_TIMING(evict_inode_t, evict_time);
nova_dbg_verbose("%s: %lu\n", __func__, inode->i_ino);
if (!inode->i_nlink && !is_bad_inode(inode)) {
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
goto out;
destroy = 1;
/* We need the log to free the blocks from the b-tree */
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
last_blocknr = nova_get_last_blocknr(sb, sih);
nova_dbgv("%s: file ino %lu\n", __func__, inode->i_ino);
freed = nova_delete_file_tree(sb, sih, 0,
last_blocknr, true, true);
break;
case S_IFDIR:
nova_dbgv("%s: dir ino %lu\n", __func__, inode->i_ino);
nova_delete_dir_tree(sb, sih);
break;
case S_IFLNK:
/* Log will be freed later */
nova_dbgv("%s: symlink ino %lu\n",
__func__, inode->i_ino);
freed = nova_delete_file_tree(sb, sih, 0, 0,
true, true);
break;
default:
nova_dbgv("%s: special ino %lu\n",
__func__, inode->i_ino);
break;
}
nova_dbg_verbose("%s: Freed %d\n", __func__, freed);
/* Then we can free the inode */
err = nova_free_inode(inode, sih);
if (err) {
nova_err(sb, "%s: free inode %lu failed\n",
__func__, inode->i_ino);
goto out;
}
pi = NULL; /* we no longer own the nova_inode */
inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
inode->i_size = 0;
}
out:
if (destroy == 0)
nova_free_dram_resource(sb, sih);
/* TODO: Since we don't use page-cache, do we really need the following
* call? */
truncate_inode_pages(&inode->i_data, 0);
clear_inode(inode);
NOVA_END_TIMING(evict_inode_t, evict_time);
}
/* Returns 0 on failure */
u64 nova_new_nova_inode(struct super_block *sb, u64 *pi_addr)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct inode_map *inode_map;
unsigned long free_ino = 0;
int map_id;
u64 ino = 0;
int ret;
timing_t new_inode_time;
NOVA_START_TIMING(new_nova_inode_t, new_inode_time);
map_id = sbi->map_id;
sbi->map_id = (sbi->map_id + 1) % sbi->cpus;
inode_map = &sbi->inode_maps[map_id];
mutex_lock(&inode_map->inode_table_mutex);
ret = nova_alloc_unused_inode(sb, map_id, &free_ino);
if (ret) {
nova_dbg("%s: alloc inode number failed %d\n", __func__, ret);
mutex_unlock(&inode_map->inode_table_mutex);
return 0;
}
ret = nova_get_inode_address(sb, free_ino, pi_addr, 1);
if (ret) {
nova_dbg("%s: get inode address failed %d\n", __func__, ret);
mutex_unlock(&inode_map->inode_table_mutex);
return 0;
}
mutex_unlock(&inode_map->inode_table_mutex);