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linux/fs/f2fs/node.c
Mel Gorman 2457aec637 mm: non-atomically mark page accessed during page cache allocation where possible 
aops->write_begin may allocate a new page and make it visible only to have
mark_page_accessed called almost immediately after.  Once the page is
visible the atomic operations are necessary which is noticable overhead
when writing to an in-memory filesystem like tmpfs but should also be
noticable with fast storage.  The objective of the patch is to initialse
the accessed information with non-atomic operations before the page is
visible.

The bulk of filesystems directly or indirectly use
grab_cache_page_write_begin or find_or_create_page for the initial
allocation of a page cache page.  This patch adds an init_page_accessed()
helper which behaves like the first call to mark_page_accessed() but may
called before the page is visible and can be done non-atomically.

The primary APIs of concern in this care are the following and are used
by most filesystems.

	find_get_page
	find_lock_page
	find_or_create_page
	grab_cache_page_nowait
	grab_cache_page_write_begin

All of them are very similar in detail to the patch creates a core helper
pagecache_get_page() which takes a flags parameter that affects its
behavior such as whether the page should be marked accessed or not.  Then
old API is preserved but is basically a thin wrapper around this core
function.

Each of the filesystems are then updated to avoid calling
mark_page_accessed when it is known that the VM interfaces have already
done the job.  There is a slight snag in that the timing of the
mark_page_accessed() has now changed so in rare cases it's possible a page
gets to the end of the LRU as PageReferenced where as previously it might
have been repromoted.  This is expected to be rare but it's worth the
filesystem people thinking about it in case they see a problem with the
timing change.  It is also the case that some filesystems may be marking
pages accessed that previously did not but it makes sense that filesystems
have consistent behaviour in this regard.

The test case used to evaulate this is a simple dd of a large file done
multiple times with the file deleted on each iterations.  The size of the
file is 1/10th physical memory to avoid dirty page balancing.  In the
async case it will be possible that the workload completes without even
hitting the disk and will have variable results but highlight the impact
of mark_page_accessed for async IO.  The sync results are expected to be
more stable.  The exception is tmpfs where the normal case is for the "IO"
to not hit the disk.

The test machine was single socket and UMA to avoid any scheduling or NUMA
artifacts.  Throughput and wall times are presented for sync IO, only wall
times are shown for async as the granularity reported by dd and the
variability is unsuitable for comparison.  As async results were variable
do to writback timings, I'm only reporting the maximum figures.  The sync
results were stable enough to make the mean and stddev uninteresting.

The performance results are reported based on a run with no profiling.
Profile data is based on a separate run with oprofile running.

async dd
                                    3.15.0-rc3            3.15.0-rc3
                                       vanilla           accessed-v2
ext3    Max      elapsed     13.9900 (  0.00%)     11.5900 ( 17.16%)
tmpfs	Max      elapsed      0.5100 (  0.00%)      0.4900 (  3.92%)
btrfs   Max      elapsed     12.8100 (  0.00%)     12.7800 (  0.23%)
ext4	Max      elapsed     18.6000 (  0.00%)     13.3400 ( 28.28%)
xfs	Max      elapsed     12.5600 (  0.00%)      2.0900 ( 83.36%)

The XFS figure is a bit strange as it managed to avoid a worst case by
sheer luck but the average figures looked reasonable.

        samples percentage
ext3       86107    0.9783  vmlinux-3.15.0-rc4-vanilla        mark_page_accessed
ext3       23833    0.2710  vmlinux-3.15.0-rc4-accessed-v3r25 mark_page_accessed
ext3        5036    0.0573  vmlinux-3.15.0-rc4-accessed-v3r25 init_page_accessed
ext4       64566    0.8961  vmlinux-3.15.0-rc4-vanilla        mark_page_accessed
ext4        5322    0.0713  vmlinux-3.15.0-rc4-accessed-v3r25 mark_page_accessed
ext4        2869    0.0384  vmlinux-3.15.0-rc4-accessed-v3r25 init_page_accessed
xfs        62126    1.7675  vmlinux-3.15.0-rc4-vanilla        mark_page_accessed
xfs         1904    0.0554  vmlinux-3.15.0-rc4-accessed-v3r25 init_page_accessed
xfs          103    0.0030  vmlinux-3.15.0-rc4-accessed-v3r25 mark_page_accessed
btrfs      10655    0.1338  vmlinux-3.15.0-rc4-vanilla        mark_page_accessed
btrfs       2020    0.0273  vmlinux-3.15.0-rc4-accessed-v3r25 init_page_accessed
btrfs        587    0.0079  vmlinux-3.15.0-rc4-accessed-v3r25 mark_page_accessed
tmpfs      59562    3.2628  vmlinux-3.15.0-rc4-vanilla        mark_page_accessed
tmpfs       1210    0.0696  vmlinux-3.15.0-rc4-accessed-v3r25 init_page_accessed
tmpfs         94    0.0054  vmlinux-3.15.0-rc4-accessed-v3r25 mark_page_accessed

[akpm@linux-foundation.org: don't run init_page_accessed() against an uninitialised pointer]
Signed-off-by: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Jan Kara <jack@suse.cz>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Tested-by: Prabhakar Lad <prabhakar.csengg@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-04 16:54:10 -07:00

1979 lines
47 KiB
C
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/*
* fs/f2fs/node.c
*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/mpage.h>
#include <linux/backing-dev.h>
#include <linux/blkdev.h>
#include <linux/pagevec.h>
#include <linux/swap.h>
#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include <trace/events/f2fs.h>
#define on_build_free_nids(nmi) mutex_is_locked(&nm_i->build_lock)
static struct kmem_cache *nat_entry_slab;
static struct kmem_cache *free_nid_slab;
static inline bool available_free_memory(struct f2fs_nm_info *nm_i, int type)
{
struct sysinfo val;
unsigned long mem_size = 0;
si_meminfo(&val);
if (type == FREE_NIDS)
mem_size = nm_i->fcnt * sizeof(struct free_nid);
else if (type == NAT_ENTRIES)
mem_size += nm_i->nat_cnt * sizeof(struct nat_entry);
mem_size >>= 12;
/* give 50:50 memory for free nids and nat caches respectively */
return (mem_size < ((val.totalram * nm_i->ram_thresh) >> 11));
}
static void clear_node_page_dirty(struct page *page)
{
struct address_space *mapping = page->mapping;
struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
unsigned int long flags;
if (PageDirty(page)) {
spin_lock_irqsave(&mapping->tree_lock, flags);
radix_tree_tag_clear(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_DIRTY);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
clear_page_dirty_for_io(page);
dec_page_count(sbi, F2FS_DIRTY_NODES);
}
ClearPageUptodate(page);
}
static struct page *get_current_nat_page(struct f2fs_sb_info *sbi, nid_t nid)
{
pgoff_t index = current_nat_addr(sbi, nid);
return get_meta_page(sbi, index);
}
static struct page *get_next_nat_page(struct f2fs_sb_info *sbi, nid_t nid)
{
struct page *src_page;
struct page *dst_page;
pgoff_t src_off;
pgoff_t dst_off;
void *src_addr;
void *dst_addr;
struct f2fs_nm_info *nm_i = NM_I(sbi);
src_off = current_nat_addr(sbi, nid);
dst_off = next_nat_addr(sbi, src_off);
/* get current nat block page with lock */
src_page = get_meta_page(sbi, src_off);
/* Dirty src_page means that it is already the new target NAT page. */
if (PageDirty(src_page))
return src_page;
dst_page = grab_meta_page(sbi, dst_off);
src_addr = page_address(src_page);
dst_addr = page_address(dst_page);
memcpy(dst_addr, src_addr, PAGE_CACHE_SIZE);
set_page_dirty(dst_page);
f2fs_put_page(src_page, 1);
set_to_next_nat(nm_i, nid);
return dst_page;
}
static struct nat_entry *__lookup_nat_cache(struct f2fs_nm_info *nm_i, nid_t n)
{
return radix_tree_lookup(&nm_i->nat_root, n);
}
static unsigned int __gang_lookup_nat_cache(struct f2fs_nm_info *nm_i,
nid_t start, unsigned int nr, struct nat_entry **ep)
{
return radix_tree_gang_lookup(&nm_i->nat_root, (void **)ep, start, nr);
}
static void __del_from_nat_cache(struct f2fs_nm_info *nm_i, struct nat_entry *e)
{
list_del(&e->list);
radix_tree_delete(&nm_i->nat_root, nat_get_nid(e));
nm_i->nat_cnt--;
kmem_cache_free(nat_entry_slab, e);
}
int is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct nat_entry *e;
int is_cp = 1;
read_lock(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, nid);
if (e && !e->checkpointed)
is_cp = 0;
read_unlock(&nm_i->nat_tree_lock);
return is_cp;
}
bool fsync_mark_done(struct f2fs_sb_info *sbi, nid_t nid)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct nat_entry *e;
bool fsync_done = false;
read_lock(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, nid);
if (e)
fsync_done = e->fsync_done;
read_unlock(&nm_i->nat_tree_lock);
return fsync_done;
}
static struct nat_entry *grab_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid)
{
struct nat_entry *new;
new = kmem_cache_alloc(nat_entry_slab, GFP_ATOMIC);
if (!new)
return NULL;
if (radix_tree_insert(&nm_i->nat_root, nid, new)) {
kmem_cache_free(nat_entry_slab, new);
return NULL;
}
memset(new, 0, sizeof(struct nat_entry));
nat_set_nid(new, nid);
new->checkpointed = true;
list_add_tail(&new->list, &nm_i->nat_entries);
nm_i->nat_cnt++;
return new;
}
static void cache_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid,
struct f2fs_nat_entry *ne)
{
struct nat_entry *e;
retry:
write_lock(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, nid);
if (!e) {
e = grab_nat_entry(nm_i, nid);
if (!e) {
write_unlock(&nm_i->nat_tree_lock);
goto retry;
}
nat_set_blkaddr(e, le32_to_cpu(ne->block_addr));
nat_set_ino(e, le32_to_cpu(ne->ino));
nat_set_version(e, ne->version);
}
write_unlock(&nm_i->nat_tree_lock);
}
static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni,
block_t new_blkaddr, bool fsync_done)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct nat_entry *e;
retry:
write_lock(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, ni->nid);
if (!e) {
e = grab_nat_entry(nm_i, ni->nid);
if (!e) {
write_unlock(&nm_i->nat_tree_lock);
goto retry;
}
e->ni = *ni;
f2fs_bug_on(ni->blk_addr == NEW_ADDR);
} else if (new_blkaddr == NEW_ADDR) {
/*
* when nid is reallocated,
* previous nat entry can be remained in nat cache.
* So, reinitialize it with new information.
*/
e->ni = *ni;
f2fs_bug_on(ni->blk_addr != NULL_ADDR);
}
/* sanity check */
f2fs_bug_on(nat_get_blkaddr(e) != ni->blk_addr);
f2fs_bug_on(nat_get_blkaddr(e) == NULL_ADDR &&
new_blkaddr == NULL_ADDR);
f2fs_bug_on(nat_get_blkaddr(e) == NEW_ADDR &&
new_blkaddr == NEW_ADDR);
f2fs_bug_on(nat_get_blkaddr(e) != NEW_ADDR &&
nat_get_blkaddr(e) != NULL_ADDR &&
new_blkaddr == NEW_ADDR);
/* increament version no as node is removed */
if (nat_get_blkaddr(e) != NEW_ADDR && new_blkaddr == NULL_ADDR) {
unsigned char version = nat_get_version(e);
nat_set_version(e, inc_node_version(version));
}
/* change address */
nat_set_blkaddr(e, new_blkaddr);
__set_nat_cache_dirty(nm_i, e);
/* update fsync_mark if its inode nat entry is still alive */
e = __lookup_nat_cache(nm_i, ni->ino);
if (e)
e->fsync_done = fsync_done;
write_unlock(&nm_i->nat_tree_lock);
}
int try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
if (available_free_memory(nm_i, NAT_ENTRIES))
return 0;
write_lock(&nm_i->nat_tree_lock);
while (nr_shrink && !list_empty(&nm_i->nat_entries)) {
struct nat_entry *ne;
ne = list_first_entry(&nm_i->nat_entries,
struct nat_entry, list);
__del_from_nat_cache(nm_i, ne);
nr_shrink--;
}
write_unlock(&nm_i->nat_tree_lock);
return nr_shrink;
}
/*
* This function returns always success
*/
void get_node_info(struct f2fs_sb_info *sbi, nid_t nid, struct node_info *ni)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
struct f2fs_summary_block *sum = curseg->sum_blk;
nid_t start_nid = START_NID(nid);
struct f2fs_nat_block *nat_blk;
struct page *page = NULL;
struct f2fs_nat_entry ne;
struct nat_entry *e;
int i;
memset(&ne, 0, sizeof(struct f2fs_nat_entry));
ni->nid = nid;
/* Check nat cache */
read_lock(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, nid);
if (e) {
ni->ino = nat_get_ino(e);
ni->blk_addr = nat_get_blkaddr(e);
ni->version = nat_get_version(e);
}
read_unlock(&nm_i->nat_tree_lock);
if (e)
return;
/* Check current segment summary */
mutex_lock(&curseg->curseg_mutex);
i = lookup_journal_in_cursum(sum, NAT_JOURNAL, nid, 0);
if (i >= 0) {
ne = nat_in_journal(sum, i);
node_info_from_raw_nat(ni, &ne);
}
mutex_unlock(&curseg->curseg_mutex);
if (i >= 0)
goto cache;
/* Fill node_info from nat page */
page = get_current_nat_page(sbi, start_nid);
nat_blk = (struct f2fs_nat_block *)page_address(page);
ne = nat_blk->entries[nid - start_nid];
node_info_from_raw_nat(ni, &ne);
f2fs_put_page(page, 1);
cache:
/* cache nat entry */
cache_nat_entry(NM_I(sbi), nid, &ne);
}
/*
* The maximum depth is four.
* Offset[0] will have raw inode offset.
*/
static int get_node_path(struct f2fs_inode_info *fi, long block,
int offset[4], unsigned int noffset[4])
{
const long direct_index = ADDRS_PER_INODE(fi);
const long direct_blks = ADDRS_PER_BLOCK;
const long dptrs_per_blk = NIDS_PER_BLOCK;
const long indirect_blks = ADDRS_PER_BLOCK * NIDS_PER_BLOCK;
const long dindirect_blks = indirect_blks * NIDS_PER_BLOCK;
int n = 0;
int level = 0;
noffset[0] = 0;
if (block < direct_index) {
offset[n] = block;
goto got;
}
block -= direct_index;
if (block < direct_blks) {
offset[n++] = NODE_DIR1_BLOCK;
noffset[n] = 1;
offset[n] = block;
level = 1;
goto got;
}
block -= direct_blks;
if (block < direct_blks) {
offset[n++] = NODE_DIR2_BLOCK;
noffset[n] = 2;
offset[n] = block;
level = 1;
goto got;
}
block -= direct_blks;
if (block < indirect_blks) {
offset[n++] = NODE_IND1_BLOCK;
noffset[n] = 3;
offset[n++] = block / direct_blks;
noffset[n] = 4 + offset[n - 1];
offset[n] = block % direct_blks;
level = 2;
goto got;
}
block -= indirect_blks;
if (block < indirect_blks) {
offset[n++] = NODE_IND2_BLOCK;
noffset[n] = 4 + dptrs_per_blk;
offset[n++] = block / direct_blks;
noffset[n] = 5 + dptrs_per_blk + offset[n - 1];
offset[n] = block % direct_blks;
level = 2;
goto got;
}
block -= indirect_blks;
if (block < dindirect_blks) {
offset[n++] = NODE_DIND_BLOCK;
noffset[n] = 5 + (dptrs_per_blk * 2);
offset[n++] = block / indirect_blks;
noffset[n] = 6 + (dptrs_per_blk * 2) +
offset[n - 1] * (dptrs_per_blk + 1);
offset[n++] = (block / direct_blks) % dptrs_per_blk;
noffset[n] = 7 + (dptrs_per_blk * 2) +
offset[n - 2] * (dptrs_per_blk + 1) +
offset[n - 1];
offset[n] = block % direct_blks;
level = 3;
goto got;
} else {
BUG();
}
got:
return level;
}
/*
* Caller should call f2fs_put_dnode(dn).
* Also, it should grab and release a rwsem by calling f2fs_lock_op() and
* f2fs_unlock_op() only if ro is not set RDONLY_NODE.
* In the case of RDONLY_NODE, we don't need to care about mutex.
*/
int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
{
struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
struct page *npage[4];
struct page *parent;
int offset[4];
unsigned int noffset[4];
nid_t nids[4];
int level, i;
int err = 0;
level = get_node_path(F2FS_I(dn->inode), index, offset, noffset);
nids[0] = dn->inode->i_ino;
npage[0] = dn->inode_page;
if (!npage[0]) {
npage[0] = get_node_page(sbi, nids[0]);
if (IS_ERR(npage[0]))
return PTR_ERR(npage[0]);
}
parent = npage[0];
if (level != 0)
nids[1] = get_nid(parent, offset[0], true);
dn->inode_page = npage[0];
dn->inode_page_locked = true;
/* get indirect or direct nodes */
for (i = 1; i <= level; i++) {
bool done = false;
if (!nids[i] && mode == ALLOC_NODE) {
/* alloc new node */
if (!alloc_nid(sbi, &(nids[i]))) {
err = -ENOSPC;
goto release_pages;
}
dn->nid = nids[i];
npage[i] = new_node_page(dn, noffset[i], NULL);
if (IS_ERR(npage[i])) {
alloc_nid_failed(sbi, nids[i]);
err = PTR_ERR(npage[i]);
goto release_pages;
}
set_nid(parent, offset[i - 1], nids[i], i == 1);
alloc_nid_done(sbi, nids[i]);
done = true;
} else if (mode == LOOKUP_NODE_RA && i == level && level > 1) {
npage[i] = get_node_page_ra(parent, offset[i - 1]);
if (IS_ERR(npage[i])) {
err = PTR_ERR(npage[i]);
goto release_pages;
}
done = true;
}
if (i == 1) {
dn->inode_page_locked = false;
unlock_page(parent);
} else {
f2fs_put_page(parent, 1);
}
if (!done) {
npage[i] = get_node_page(sbi, nids[i]);
if (IS_ERR(npage[i])) {
err = PTR_ERR(npage[i]);
f2fs_put_page(npage[0], 0);
goto release_out;
}
}
if (i < level) {
parent = npage[i];
nids[i + 1] = get_nid(parent, offset[i], false);
}
}
dn->nid = nids[level];
dn->ofs_in_node = offset[level];
dn->node_page = npage[level];
dn->data_blkaddr = datablock_addr(dn->node_page, dn->ofs_in_node);
return 0;
release_pages:
f2fs_put_page(parent, 1);
if (i > 1)
f2fs_put_page(npage[0], 0);
release_out:
dn->inode_page = NULL;
dn->node_page = NULL;
return err;
}
static void truncate_node(struct dnode_of_data *dn)
{
struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
struct node_info ni;
get_node_info(sbi, dn->nid, &ni);
if (dn->inode->i_blocks == 0) {
f2fs_bug_on(ni.blk_addr != NULL_ADDR);
goto invalidate;
}
f2fs_bug_on(ni.blk_addr == NULL_ADDR);
/* Deallocate node address */
invalidate_blocks(sbi, ni.blk_addr);
dec_valid_node_count(sbi, dn->inode);
set_node_addr(sbi, &ni, NULL_ADDR, false);
if (dn->nid == dn->inode->i_ino) {
remove_orphan_inode(sbi, dn->nid);
dec_valid_inode_count(sbi);
} else {
sync_inode_page(dn);
}
invalidate:
clear_node_page_dirty(dn->node_page);
F2FS_SET_SB_DIRT(sbi);
f2fs_put_page(dn->node_page, 1);
invalidate_mapping_pages(NODE_MAPPING(sbi),
dn->node_page->index, dn->node_page->index);
dn->node_page = NULL;
trace_f2fs_truncate_node(dn->inode, dn->nid, ni.blk_addr);
}
static int truncate_dnode(struct dnode_of_data *dn)
{
struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
struct page *page;
if (dn->nid == 0)
return 1;
/* get direct node */
page = get_node_page(sbi, dn->nid);
if (IS_ERR(page) && PTR_ERR(page) == -ENOENT)
return 1;
else if (IS_ERR(page))
return PTR_ERR(page);
/* Make dnode_of_data for parameter */
dn->node_page = page;
dn->ofs_in_node = 0;
truncate_data_blocks(dn);
truncate_node(dn);
return 1;
}
static int truncate_nodes(struct dnode_of_data *dn, unsigned int nofs,
int ofs, int depth)
{
struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
struct dnode_of_data rdn = *dn;
struct page *page;
struct f2fs_node *rn;
nid_t child_nid;
unsigned int child_nofs;
int freed = 0;
int i, ret;
if (dn->nid == 0)
return NIDS_PER_BLOCK + 1;
trace_f2fs_truncate_nodes_enter(dn->inode, dn->nid, dn->data_blkaddr);
page = get_node_page(sbi, dn->nid);
if (IS_ERR(page)) {
trace_f2fs_truncate_nodes_exit(dn->inode, PTR_ERR(page));
return PTR_ERR(page);
}
rn = F2FS_NODE(page);
if (depth < 3) {
for (i = ofs; i < NIDS_PER_BLOCK; i++, freed++) {
child_nid = le32_to_cpu(rn->in.nid[i]);
if (child_nid == 0)
continue;
rdn.nid = child_nid;
ret = truncate_dnode(&rdn);
if (ret < 0)
goto out_err;
set_nid(page, i, 0, false);
}
} else {
child_nofs = nofs + ofs * (NIDS_PER_BLOCK + 1) + 1;
for (i = ofs; i < NIDS_PER_BLOCK; i++) {
child_nid = le32_to_cpu(rn->in.nid[i]);
if (child_nid == 0) {
child_nofs += NIDS_PER_BLOCK + 1;
continue;
}
rdn.nid = child_nid;
ret = truncate_nodes(&rdn, child_nofs, 0, depth - 1);
if (ret == (NIDS_PER_BLOCK + 1)) {
set_nid(page, i, 0, false);
child_nofs += ret;
} else if (ret < 0 && ret != -ENOENT) {
goto out_err;
}
}
freed = child_nofs;
}
if (!ofs) {
/* remove current indirect node */
dn->node_page = page;
truncate_node(dn);
freed++;
} else {
f2fs_put_page(page, 1);
}
trace_f2fs_truncate_nodes_exit(dn->inode, freed);
return freed;
out_err:
f2fs_put_page(page, 1);
trace_f2fs_truncate_nodes_exit(dn->inode, ret);
return ret;
}
static int truncate_partial_nodes(struct dnode_of_data *dn,
struct f2fs_inode *ri, int *offset, int depth)
{
struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
struct page *pages[2];
nid_t nid[3];
nid_t child_nid;
int err = 0;
int i;
int idx = depth - 2;
nid[0] = le32_to_cpu(ri->i_nid[offset[0] - NODE_DIR1_BLOCK]);
if (!nid[0])
return 0;
/* get indirect nodes in the path */
for (i = 0; i < idx + 1; i++) {
/* refernece count'll be increased */
pages[i] = get_node_page(sbi, nid[i]);
if (IS_ERR(pages[i])) {
err = PTR_ERR(pages[i]);
idx = i - 1;
goto fail;
}
nid[i + 1] = get_nid(pages[i], offset[i + 1], false);
}
/* free direct nodes linked to a partial indirect node */
for (i = offset[idx + 1]; i < NIDS_PER_BLOCK; i++) {
child_nid = get_nid(pages[idx], i, false);
if (!child_nid)
continue;
dn->nid = child_nid;
err = truncate_dnode(dn);
if (err < 0)
goto fail;
set_nid(pages[idx], i, 0, false);
}
if (offset[idx + 1] == 0) {
dn->node_page = pages[idx];
dn->nid = nid[idx];
truncate_node(dn);
} else {
f2fs_put_page(pages[idx], 1);
}
offset[idx]++;
offset[idx + 1] = 0;
idx--;
fail:
for (i = idx; i >= 0; i--)
f2fs_put_page(pages[i], 1);
trace_f2fs_truncate_partial_nodes(dn->inode, nid, depth, err);
return err;
}
/*
* All the block addresses of data and nodes should be nullified.
*/
int truncate_inode_blocks(struct inode *inode, pgoff_t from)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
int err = 0, cont = 1;
int level, offset[4], noffset[4];
unsigned int nofs = 0;
struct f2fs_inode *ri;
struct dnode_of_data dn;
struct page *page;
trace_f2fs_truncate_inode_blocks_enter(inode, from);
level = get_node_path(F2FS_I(inode), from, offset, noffset);
restart:
page = get_node_page(sbi, inode->i_ino);
if (IS_ERR(page)) {
trace_f2fs_truncate_inode_blocks_exit(inode, PTR_ERR(page));
return PTR_ERR(page);
}
set_new_dnode(&dn, inode, page, NULL, 0);
unlock_page(page);
ri = F2FS_INODE(page);
switch (level) {
case 0:
case 1:
nofs = noffset[1];
break;
case 2:
nofs = noffset[1];
if (!offset[level - 1])
goto skip_partial;
err = truncate_partial_nodes(&dn, ri, offset, level);
if (err < 0 && err != -ENOENT)
goto fail;
nofs += 1 + NIDS_PER_BLOCK;
break;
case 3:
nofs = 5 + 2 * NIDS_PER_BLOCK;
if (!offset[level - 1])
goto skip_partial;
err = truncate_partial_nodes(&dn, ri, offset, level);
if (err < 0 && err != -ENOENT)
goto fail;
break;
default:
BUG();
}
skip_partial:
while (cont) {
dn.nid = le32_to_cpu(ri->i_nid[offset[0] - NODE_DIR1_BLOCK]);
switch (offset[0]) {
case NODE_DIR1_BLOCK:
case NODE_DIR2_BLOCK:
err = truncate_dnode(&dn);
break;
case NODE_IND1_BLOCK:
case NODE_IND2_BLOCK:
err = truncate_nodes(&dn, nofs, offset[1], 2);
break;
case NODE_DIND_BLOCK:
err = truncate_nodes(&dn, nofs, offset[1], 3);
cont = 0;
break;
default:
BUG();
}
if (err < 0 && err != -ENOENT)
goto fail;
if (offset[1] == 0 &&
ri->i_nid[offset[0] - NODE_DIR1_BLOCK]) {
lock_page(page);
if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
f2fs_put_page(page, 1);
goto restart;
}
f2fs_wait_on_page_writeback(page, NODE);
ri->i_nid[offset[0] - NODE_DIR1_BLOCK] = 0;
set_page_dirty(page);
unlock_page(page);
}
offset[1] = 0;
offset[0]++;
nofs += err;
}
fail:
f2fs_put_page(page, 0);
trace_f2fs_truncate_inode_blocks_exit(inode, err);
return err > 0 ? 0 : err;
}
int truncate_xattr_node(struct inode *inode, struct page *page)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
nid_t nid = F2FS_I(inode)->i_xattr_nid;
struct dnode_of_data dn;
struct page *npage;
if (!nid)
return 0;
npage = get_node_page(sbi, nid);
if (IS_ERR(npage))
return PTR_ERR(npage);
F2FS_I(inode)->i_xattr_nid = 0;
/* need to do checkpoint during fsync */
F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi));
set_new_dnode(&dn, inode, page, npage, nid);
if (page)
dn.inode_page_locked = true;
truncate_node(&dn);
return 0;
}
/*
* Caller should grab and release a rwsem by calling f2fs_lock_op() and
* f2fs_unlock_op().
*/
void remove_inode_page(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct page *page;
nid_t ino = inode->i_ino;
struct dnode_of_data dn;
page = get_node_page(sbi, ino);
if (IS_ERR(page))
return;
if (truncate_xattr_node(inode, page)) {
f2fs_put_page(page, 1);
return;
}
/* 0 is possible, after f2fs_new_inode() is failed */
f2fs_bug_on(inode->i_blocks != 0 && inode->i_blocks != 1);
set_new_dnode(&dn, inode, page, page, ino);
truncate_node(&dn);
}
struct page *new_inode_page(struct inode *inode, const struct qstr *name)
{
struct dnode_of_data dn;
/* allocate inode page for new inode */
set_new_dnode(&dn, inode, NULL, NULL, inode->i_ino);
/* caller should f2fs_put_page(page, 1); */
return new_node_page(&dn, 0, NULL);
}
struct page *new_node_page(struct dnode_of_data *dn,
unsigned int ofs, struct page *ipage)
{
struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
struct node_info old_ni, new_ni;
struct page *page;
int err;
if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
return ERR_PTR(-EPERM);
page = grab_cache_page_write_begin(NODE_MAPPING(sbi),
dn->nid, AOP_FLAG_NOFS);
if (!page)
return ERR_PTR(-ENOMEM);
if (unlikely(!inc_valid_node_count(sbi, dn->inode))) {
err = -ENOSPC;
goto fail;
}
get_node_info(sbi, dn->nid, &old_ni);
/* Reinitialize old_ni with new node page */
f2fs_bug_on(old_ni.blk_addr != NULL_ADDR);
new_ni = old_ni;
new_ni.ino = dn->inode->i_ino;
set_node_addr(sbi, &new_ni, NEW_ADDR, false);
fill_node_footer(page, dn->nid, dn->inode->i_ino, ofs, true);
set_cold_node(dn->inode, page);
SetPageUptodate(page);
set_page_dirty(page);
if (f2fs_has_xattr_block(ofs))
F2FS_I(dn->inode)->i_xattr_nid = dn->nid;
dn->node_page = page;
if (ipage)
update_inode(dn->inode, ipage);
else
sync_inode_page(dn);
if (ofs == 0)
inc_valid_inode_count(sbi);
return page;
fail:
clear_node_page_dirty(page);
f2fs_put_page(page, 1);
return ERR_PTR(err);
}
/*
* Caller should do after getting the following values.
* 0: f2fs_put_page(page, 0)
* LOCKED_PAGE: f2fs_put_page(page, 1)
* error: nothing
*/
static int read_node_page(struct page *page, int rw)
{
struct f2fs_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb);
struct node_info ni;
get_node_info(sbi, page->index, &ni);
if (unlikely(ni.blk_addr == NULL_ADDR)) {
f2fs_put_page(page, 1);
return -ENOENT;
}
if (PageUptodate(page))
return LOCKED_PAGE;
return f2fs_submit_page_bio(sbi, page, ni.blk_addr, rw);
}
/*
* Readahead a node page
*/
void ra_node_page(struct f2fs_sb_info *sbi, nid_t nid)
{
struct page *apage;
int err;
apage = find_get_page(NODE_MAPPING(sbi), nid);
if (apage && PageUptodate(apage)) {
f2fs_put_page(apage, 0);
return;
}
f2fs_put_page(apage, 0);
apage = grab_cache_page(NODE_MAPPING(sbi), nid);
if (!apage)
return;
err = read_node_page(apage, READA);
if (err == 0)
f2fs_put_page(apage, 0);
else if (err == LOCKED_PAGE)
f2fs_put_page(apage, 1);
}
struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
{
struct page *page;
int err;
repeat:
page = grab_cache_page_write_begin(NODE_MAPPING(sbi),
nid, AOP_FLAG_NOFS);
if (!page)
return ERR_PTR(-ENOMEM);
err = read_node_page(page, READ_SYNC);
if (err < 0)
return ERR_PTR(err);
else if (err == LOCKED_PAGE)
goto got_it;
lock_page(page);
if (unlikely(!PageUptodate(page) || nid != nid_of_node(page))) {
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
}
if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
f2fs_put_page(page, 1);
goto repeat;
}
got_it:
return page;
}
/*
* Return a locked page for the desired node page.
* And, readahead MAX_RA_NODE number of node pages.
*/
struct page *get_node_page_ra(struct page *parent, int start)
{
struct f2fs_sb_info *sbi = F2FS_SB(parent->mapping->host->i_sb);
struct blk_plug plug;
struct page *page;
int err, i, end;
nid_t nid;
/* First, try getting the desired direct node. */
nid = get_nid(parent, start, false);
if (!nid)
return ERR_PTR(-ENOENT);
repeat:
page = grab_cache_page(NODE_MAPPING(sbi), nid);
if (!page)
return ERR_PTR(-ENOMEM);
err = read_node_page(page, READ_SYNC);
if (err < 0)
return ERR_PTR(err);
else if (err == LOCKED_PAGE)
goto page_hit;
blk_start_plug(&plug);
/* Then, try readahead for siblings of the desired node */
end = start + MAX_RA_NODE;
end = min(end, NIDS_PER_BLOCK);
for (i = start + 1; i < end; i++) {
nid = get_nid(parent, i, false);
if (!nid)
continue;
ra_node_page(sbi, nid);
}
blk_finish_plug(&plug);
lock_page(page);
if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
f2fs_put_page(page, 1);
goto repeat;
}
page_hit:
if (unlikely(!PageUptodate(page))) {
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
}
return page;
}
void sync_inode_page(struct dnode_of_data *dn)
{
if (IS_INODE(dn->node_page) || dn->inode_page == dn->node_page) {
update_inode(dn->inode, dn->node_page);
} else if (dn->inode_page) {
if (!dn->inode_page_locked)
lock_page(dn->inode_page);
update_inode(dn->inode, dn->inode_page);
if (!dn->inode_page_locked)
unlock_page(dn->inode_page);
} else {
update_inode_page(dn->inode);
}
}
int sync_node_pages(struct f2fs_sb_info *sbi, nid_t ino,
struct writeback_control *wbc)
{
pgoff_t index, end;
struct pagevec pvec;
int step = ino ? 2 : 0;
int nwritten = 0, wrote = 0;
pagevec_init(&pvec, 0);
next_step:
index = 0;
end = LONG_MAX;
while (index <= end) {
int i, nr_pages;
nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
PAGECACHE_TAG_DIRTY,
min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
if (nr_pages == 0)
break;
for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i];
/*
* flushing sequence with step:
* 0. indirect nodes
* 1. dentry dnodes
* 2. file dnodes
*/
if (step == 0 && IS_DNODE(page))
continue;
if (step == 1 && (!IS_DNODE(page) ||
is_cold_node(page)))
continue;
if (step == 2 && (!IS_DNODE(page) ||
!is_cold_node(page)))
continue;
/*
* If an fsync mode,
* we should not skip writing node pages.
*/
if (ino && ino_of_node(page) == ino)
lock_page(page);
else if (!trylock_page(page))
continue;
if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
continue_unlock:
unlock_page(page);
continue;
}
if (ino && ino_of_node(page) != ino)
goto continue_unlock;
if (!PageDirty(page)) {
/* someone wrote it for us */
goto continue_unlock;
}
if (!clear_page_dirty_for_io(page))
goto continue_unlock;
/* called by fsync() */
if (ino && IS_DNODE(page)) {
int mark = !is_checkpointed_node(sbi, ino);
set_fsync_mark(page, 1);
if (IS_INODE(page))
set_dentry_mark(page, mark);
nwritten++;
} else {
set_fsync_mark(page, 0);
set_dentry_mark(page, 0);
}
NODE_MAPPING(sbi)->a_ops->writepage(page, wbc);
wrote++;
if (--wbc->nr_to_write == 0)
break;
}
pagevec_release(&pvec);
cond_resched();
if (wbc->nr_to_write == 0) {
step = 2;
break;
}
}
if (step < 2) {
step++;
goto next_step;
}
if (wrote)
f2fs_submit_merged_bio(sbi, NODE, WRITE);
return nwritten;
}
int wait_on_node_pages_writeback(struct f2fs_sb_info *sbi, nid_t ino)
{
pgoff_t index = 0, end = LONG_MAX;
struct pagevec pvec;
int ret2 = 0, ret = 0;
pagevec_init(&pvec, 0);
while (index <= end) {
int i, nr_pages;
nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
PAGECACHE_TAG_WRITEBACK,
min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
if (nr_pages == 0)
break;
for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i];
/* until radix tree lookup accepts end_index */
if (unlikely(page->index > end))
continue;
if (ino && ino_of_node(page) == ino) {
f2fs_wait_on_page_writeback(page, NODE);
if (TestClearPageError(page))
ret = -EIO;
}
}
pagevec_release(&pvec);
cond_resched();
}
if (unlikely(test_and_clear_bit(AS_ENOSPC, &NODE_MAPPING(sbi)->flags)))
ret2 = -ENOSPC;
if (unlikely(test_and_clear_bit(AS_EIO, &NODE_MAPPING(sbi)->flags)))
ret2 = -EIO;
if (!ret)
ret = ret2;
return ret;
}
static int f2fs_write_node_page(struct page *page,
struct writeback_control *wbc)
{
struct f2fs_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb);
nid_t nid;
block_t new_addr;
struct node_info ni;
struct f2fs_io_info fio = {
.type = NODE,
.rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE,
};
if (unlikely(sbi->por_doing))
goto redirty_out;
f2fs_wait_on_page_writeback(page, NODE);
/* get old block addr of this node page */
nid = nid_of_node(page);
f2fs_bug_on(page->index != nid);
get_node_info(sbi, nid, &ni);
/* This page is already truncated */
if (unlikely(ni.blk_addr == NULL_ADDR)) {
dec_page_count(sbi, F2FS_DIRTY_NODES);
unlock_page(page);
return 0;
}
if (wbc->for_reclaim)
goto redirty_out;
mutex_lock(&sbi->node_write);
set_page_writeback(page);
write_node_page(sbi, page, &fio, nid, ni.blk_addr, &new_addr);
set_node_addr(sbi, &ni, new_addr, is_fsync_dnode(page));
dec_page_count(sbi, F2FS_DIRTY_NODES);
mutex_unlock(&sbi->node_write);
unlock_page(page);
return 0;
redirty_out:
dec_page_count(sbi, F2FS_DIRTY_NODES);
wbc->pages_skipped++;
account_page_redirty(page);
set_page_dirty(page);
return AOP_WRITEPAGE_ACTIVATE;
}
static int f2fs_write_node_pages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
long diff;
/* balancing f2fs's metadata in background */
f2fs_balance_fs_bg(sbi);
/* collect a number of dirty node pages and write together */
if (get_pages(sbi, F2FS_DIRTY_NODES) < nr_pages_to_skip(sbi, NODE))
goto skip_write;
diff = nr_pages_to_write(sbi, NODE, wbc);
wbc->sync_mode = WB_SYNC_NONE;
sync_node_pages(sbi, 0, wbc);
wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
return 0;
skip_write:
wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_NODES);
return 0;
}
static int f2fs_set_node_page_dirty(struct page *page)
{
struct address_space *mapping = page->mapping;
struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
trace_f2fs_set_page_dirty(page, NODE);
SetPageUptodate(page);
if (!PageDirty(page)) {
__set_page_dirty_nobuffers(page);
inc_page_count(sbi, F2FS_DIRTY_NODES);
SetPagePrivate(page);
return 1;
}
return 0;
}
static void f2fs_invalidate_node_page(struct page *page, unsigned int offset,
unsigned int length)
{
struct inode *inode = page->mapping->host;
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
if (PageDirty(page))
dec_page_count(sbi, F2FS_DIRTY_NODES);
ClearPagePrivate(page);
}
static int f2fs_release_node_page(struct page *page, gfp_t wait)
{
ClearPagePrivate(page);
return 1;
}
/*
* Structure of the f2fs node operations
*/
const struct address_space_operations f2fs_node_aops = {
.writepage = f2fs_write_node_page,
.writepages = f2fs_write_node_pages,
.set_page_dirty = f2fs_set_node_page_dirty,
.invalidatepage = f2fs_invalidate_node_page,
.releasepage = f2fs_release_node_page,
};
static struct free_nid *__lookup_free_nid_list(struct f2fs_nm_info *nm_i,
nid_t n)
{
return radix_tree_lookup(&nm_i->free_nid_root, n);
}
static void __del_from_free_nid_list(struct f2fs_nm_info *nm_i,
struct free_nid *i)
{
list_del(&i->list);
radix_tree_delete(&nm_i->free_nid_root, i->nid);
}
static int add_free_nid(struct f2fs_nm_info *nm_i, nid_t nid, bool build)
{
struct free_nid *i;
struct nat_entry *ne;
bool allocated = false;
if (!available_free_memory(nm_i, FREE_NIDS))
return -1;
/* 0 nid should not be used */
if (unlikely(nid == 0))
return 0;
if (build) {
/* do not add allocated nids */
read_lock(&nm_i->nat_tree_lock);
ne = __lookup_nat_cache(nm_i, nid);
if (ne &&
(!ne->checkpointed || nat_get_blkaddr(ne) != NULL_ADDR))
allocated = true;
read_unlock(&nm_i->nat_tree_lock);
if (allocated)
return 0;
}
i = f2fs_kmem_cache_alloc(free_nid_slab, GFP_NOFS);
i->nid = nid;
i->state = NID_NEW;
spin_lock(&nm_i->free_nid_list_lock);
if (radix_tree_insert(&nm_i->free_nid_root, i->nid, i)) {
spin_unlock(&nm_i->free_nid_list_lock);
kmem_cache_free(free_nid_slab, i);
return 0;
}
list_add_tail(&i->list, &nm_i->free_nid_list);
nm_i->fcnt++;
spin_unlock(&nm_i->free_nid_list_lock);
return 1;
}
static void remove_free_nid(struct f2fs_nm_info *nm_i, nid_t nid)
{
struct free_nid *i;
bool need_free = false;
spin_lock(&nm_i->free_nid_list_lock);
i = __lookup_free_nid_list(nm_i, nid);
if (i && i->state == NID_NEW) {
__del_from_free_nid_list(nm_i, i);
nm_i->fcnt--;
need_free = true;
}
spin_unlock(&nm_i->free_nid_list_lock);
if (need_free)
kmem_cache_free(free_nid_slab, i);
}
static void scan_nat_page(struct f2fs_nm_info *nm_i,
struct page *nat_page, nid_t start_nid)
{
struct f2fs_nat_block *nat_blk = page_address(nat_page);
block_t blk_addr;
int i;
i = start_nid % NAT_ENTRY_PER_BLOCK;
for (; i < NAT_ENTRY_PER_BLOCK; i++, start_nid++) {
if (unlikely(start_nid >= nm_i->max_nid))
break;
blk_addr = le32_to_cpu(nat_blk->entries[i].block_addr);
f2fs_bug_on(blk_addr == NEW_ADDR);
if (blk_addr == NULL_ADDR) {
if (add_free_nid(nm_i, start_nid, true) < 0)
break;
}
}
}
static void build_free_nids(struct f2fs_sb_info *sbi)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
struct f2fs_summary_block *sum = curseg->sum_blk;
int i = 0;
nid_t nid = nm_i->next_scan_nid;
/* Enough entries */
if (nm_i->fcnt > NAT_ENTRY_PER_BLOCK)
return;
/* readahead nat pages to be scanned */
ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), FREE_NID_PAGES, META_NAT);
while (1) {
struct page *page = get_current_nat_page(sbi, nid);
scan_nat_page(nm_i, page, nid);
f2fs_put_page(page, 1);
nid += (NAT_ENTRY_PER_BLOCK - (nid % NAT_ENTRY_PER_BLOCK));
if (unlikely(nid >= nm_i->max_nid))
nid = 0;
if (i++ == FREE_NID_PAGES)
break;
}
/* go to the next free nat pages to find free nids abundantly */
nm_i->next_scan_nid = nid;
/* find free nids from current sum_pages */
mutex_lock(&curseg->curseg_mutex);
for (i = 0; i < nats_in_cursum(sum); i++) {
block_t addr = le32_to_cpu(nat_in_journal(sum, i).block_addr);
nid = le32_to_cpu(nid_in_journal(sum, i));
if (addr == NULL_ADDR)
add_free_nid(nm_i, nid, true);
else
remove_free_nid(nm_i, nid);
}
mutex_unlock(&curseg->curseg_mutex);
}
/*
* If this function returns success, caller can obtain a new nid
* from second parameter of this function.
* The returned nid could be used ino as well as nid when inode is created.
*/
bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct free_nid *i = NULL;
retry:
if (unlikely(sbi->total_valid_node_count + 1 >= nm_i->max_nid))
return false;
spin_lock(&nm_i->free_nid_list_lock);
/* We should not use stale free nids created by build_free_nids */
if (nm_i->fcnt && !on_build_free_nids(nm_i)) {
f2fs_bug_on(list_empty(&nm_i->free_nid_list));
list_for_each_entry(i, &nm_i->free_nid_list, list)
if (i->state == NID_NEW)
break;
f2fs_bug_on(i->state != NID_NEW);
*nid = i->nid;
i->state = NID_ALLOC;
nm_i->fcnt--;
spin_unlock(&nm_i->free_nid_list_lock);
return true;
}
spin_unlock(&nm_i->free_nid_list_lock);
/* Let's scan nat pages and its caches to get free nids */
mutex_lock(&nm_i->build_lock);
build_free_nids(sbi);
mutex_unlock(&nm_i->build_lock);
goto retry;
}
/*
* alloc_nid() should be called prior to this function.
*/
void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct free_nid *i;
spin_lock(&nm_i->free_nid_list_lock);
i = __lookup_free_nid_list(nm_i, nid);
f2fs_bug_on(!i || i->state != NID_ALLOC);
__del_from_free_nid_list(nm_i, i);
spin_unlock(&nm_i->free_nid_list_lock);
kmem_cache_free(free_nid_slab, i);
}
/*
* alloc_nid() should be called prior to this function.
*/
void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct free_nid *i;
bool need_free = false;
if (!nid)
return;
spin_lock(&nm_i->free_nid_list_lock);
i = __lookup_free_nid_list(nm_i, nid);
f2fs_bug_on(!i || i->state != NID_ALLOC);
if (!available_free_memory(nm_i, FREE_NIDS)) {
__del_from_free_nid_list(nm_i, i);
need_free = true;
} else {
i->state = NID_NEW;
nm_i->fcnt++;
}
spin_unlock(&nm_i->free_nid_list_lock);
if (need_free)
kmem_cache_free(free_nid_slab, i);
}
void recover_node_page(struct f2fs_sb_info *sbi, struct page *page,
struct f2fs_summary *sum, struct node_info *ni,
block_t new_blkaddr)
{
rewrite_node_page(sbi, page, sum, ni->blk_addr, new_blkaddr);
set_node_addr(sbi, ni, new_blkaddr, false);
clear_node_page_dirty(page);
}
void recover_inline_xattr(struct inode *inode, struct page *page)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
void *src_addr, *dst_addr;
size_t inline_size;
struct page *ipage;
struct f2fs_inode *ri;
if (!f2fs_has_inline_xattr(inode))
return;
if (!IS_INODE(page))
return;
ri = F2FS_INODE(page);
if (!(ri->i_inline & F2FS_INLINE_XATTR))
return;
ipage = get_node_page(sbi, inode->i_ino);
f2fs_bug_on(IS_ERR(ipage));
dst_addr = inline_xattr_addr(ipage);
src_addr = inline_xattr_addr(page);
inline_size = inline_xattr_size(inode);
memcpy(dst_addr, src_addr, inline_size);
update_inode(inode, ipage);
f2fs_put_page(ipage, 1);
}
bool recover_xattr_data(struct inode *inode, struct page *page, block_t blkaddr)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
nid_t prev_xnid = F2FS_I(inode)->i_xattr_nid;
nid_t new_xnid = nid_of_node(page);
struct node_info ni;
recover_inline_xattr(inode, page);
if (!f2fs_has_xattr_block(ofs_of_node(page)))
return false;
/* 1: invalidate the previous xattr nid */
if (!prev_xnid)
goto recover_xnid;
/* Deallocate node address */
get_node_info(sbi, prev_xnid, &ni);
f2fs_bug_on(ni.blk_addr == NULL_ADDR);
invalidate_blocks(sbi, ni.blk_addr);
dec_valid_node_count(sbi, inode);
set_node_addr(sbi, &ni, NULL_ADDR, false);
recover_xnid:
/* 2: allocate new xattr nid */
if (unlikely(!inc_valid_node_count(sbi, inode)))
f2fs_bug_on(1);
remove_free_nid(NM_I(sbi), new_xnid);
get_node_info(sbi, new_xnid, &ni);
ni.ino = inode->i_ino;
set_node_addr(sbi, &ni, NEW_ADDR, false);
F2FS_I(inode)->i_xattr_nid = new_xnid;
/* 3: update xattr blkaddr */
refresh_sit_entry(sbi, NEW_ADDR, blkaddr);
set_node_addr(sbi, &ni, blkaddr, false);
update_inode_page(inode);
return true;
}
int recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)
{
struct f2fs_inode *src, *dst;
nid_t ino = ino_of_node(page);
struct node_info old_ni, new_ni;
struct page *ipage;
ipage = grab_cache_page(NODE_MAPPING(sbi), ino);
if (!ipage)
return -ENOMEM;
/* Should not use this inode from free nid list */
remove_free_nid(NM_I(sbi), ino);
get_node_info(sbi, ino, &old_ni);
SetPageUptodate(ipage);
fill_node_footer(ipage, ino, ino, 0, true);
src = F2FS_INODE(page);
dst = F2FS_INODE(ipage);
memcpy(dst, src, (unsigned long)&src->i_ext - (unsigned long)src);
dst->i_size = 0;
dst->i_blocks = cpu_to_le64(1);
dst->i_links = cpu_to_le32(1);
dst->i_xattr_nid = 0;
new_ni = old_ni;
new_ni.ino = ino;
if (unlikely(!inc_valid_node_count(sbi, NULL)))
WARN_ON(1);
set_node_addr(sbi, &new_ni, NEW_ADDR, false);
inc_valid_inode_count(sbi);
f2fs_put_page(ipage, 1);
return 0;
}
/*
* ra_sum_pages() merge contiguous pages into one bio and submit.
* these pre-readed pages are linked in pages list.
*/
static int ra_sum_pages(struct f2fs_sb_info *sbi, struct list_head *pages,
int start, int nrpages)
{
struct page *page;
int page_idx = start;
struct f2fs_io_info fio = {
.type = META,
.rw = READ_SYNC | REQ_META | REQ_PRIO
};
for (; page_idx < start + nrpages; page_idx++) {
/* alloc temporal page for read node summary info*/
page = alloc_page(GFP_F2FS_ZERO);
if (!page)
break;
lock_page(page);
page->index = page_idx;
list_add_tail(&page->lru, pages);
}
list_for_each_entry(page, pages, lru)
f2fs_submit_page_mbio(sbi, page, page->index, &fio);
f2fs_submit_merged_bio(sbi, META, READ);
return page_idx - start;
}
int restore_node_summary(struct f2fs_sb_info *sbi,
unsigned int segno, struct f2fs_summary_block *sum)
{
struct f2fs_node *rn;
struct f2fs_summary *sum_entry;
struct page *page, *tmp;
block_t addr;
int bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
int i, last_offset, nrpages, err = 0;
LIST_HEAD(page_list);
/* scan the node segment */
last_offset = sbi->blocks_per_seg;
addr = START_BLOCK(sbi, segno);
sum_entry = &sum->entries[0];
for (i = 0; !err && i < last_offset; i += nrpages, addr += nrpages) {
nrpages = min(last_offset - i, bio_blocks);
/* read ahead node pages */
nrpages = ra_sum_pages(sbi, &page_list, addr, nrpages);
if (!nrpages)
return -ENOMEM;
list_for_each_entry_safe(page, tmp, &page_list, lru) {
if (err)
goto skip;
lock_page(page);
if (unlikely(!PageUptodate(page))) {
err = -EIO;
} else {
rn = F2FS_NODE(page);
sum_entry->nid = rn->footer.nid;
sum_entry->version = 0;
sum_entry->ofs_in_node = 0;
sum_entry++;
}
unlock_page(page);
skip:
list_del(&page->lru);
__free_pages(page, 0);
}
}
return err;
}
static bool flush_nats_in_journal(struct f2fs_sb_info *sbi)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
struct f2fs_summary_block *sum = curseg->sum_blk;
int i;
mutex_lock(&curseg->curseg_mutex);
if (nats_in_cursum(sum) < NAT_JOURNAL_ENTRIES) {
mutex_unlock(&curseg->curseg_mutex);
return false;
}
for (i = 0; i < nats_in_cursum(sum); i++) {
struct nat_entry *ne;
struct f2fs_nat_entry raw_ne;
nid_t nid = le32_to_cpu(nid_in_journal(sum, i));
raw_ne = nat_in_journal(sum, i);
retry:
write_lock(&nm_i->nat_tree_lock);
ne = __lookup_nat_cache(nm_i, nid);
if (ne) {
__set_nat_cache_dirty(nm_i, ne);
write_unlock(&nm_i->nat_tree_lock);
continue;
}
ne = grab_nat_entry(nm_i, nid);
if (!ne) {
write_unlock(&nm_i->nat_tree_lock);
goto retry;
}
nat_set_blkaddr(ne, le32_to_cpu(raw_ne.block_addr));
nat_set_ino(ne, le32_to_cpu(raw_ne.ino));
nat_set_version(ne, raw_ne.version);
__set_nat_cache_dirty(nm_i, ne);
write_unlock(&nm_i->nat_tree_lock);
}
update_nats_in_cursum(sum, -i);
mutex_unlock(&curseg->curseg_mutex);
return true;
}
/*
* This function is called during the checkpointing process.
*/
void flush_nat_entries(struct f2fs_sb_info *sbi)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
struct f2fs_summary_block *sum = curseg->sum_blk;
struct nat_entry *ne, *cur;
struct page *page = NULL;
struct f2fs_nat_block *nat_blk = NULL;
nid_t start_nid = 0, end_nid = 0;
bool flushed;
flushed = flush_nats_in_journal(sbi);
if (!flushed)
mutex_lock(&curseg->curseg_mutex);
/* 1) flush dirty nat caches */
list_for_each_entry_safe(ne, cur, &nm_i->dirty_nat_entries, list) {
nid_t nid;
struct f2fs_nat_entry raw_ne;
int offset = -1;
block_t new_blkaddr;
if (nat_get_blkaddr(ne) == NEW_ADDR)
continue;
nid = nat_get_nid(ne);
if (flushed)
goto to_nat_page;
/* if there is room for nat enries in curseg->sumpage */
offset = lookup_journal_in_cursum(sum, NAT_JOURNAL, nid, 1);
if (offset >= 0) {
raw_ne = nat_in_journal(sum, offset);
goto flush_now;
}
to_nat_page:
if (!page || (start_nid > nid || nid > end_nid)) {
if (page) {
f2fs_put_page(page, 1);
page = NULL;
}
start_nid = START_NID(nid);
end_nid = start_nid + NAT_ENTRY_PER_BLOCK - 1;
/*
* get nat block with dirty flag, increased reference
* count, mapped and lock
*/
page = get_next_nat_page(sbi, start_nid);
nat_blk = page_address(page);
}
f2fs_bug_on(!nat_blk);
raw_ne = nat_blk->entries[nid - start_nid];
flush_now:
new_blkaddr = nat_get_blkaddr(ne);
raw_ne.ino = cpu_to_le32(nat_get_ino(ne));
raw_ne.block_addr = cpu_to_le32(new_blkaddr);
raw_ne.version = nat_get_version(ne);
if (offset < 0) {
nat_blk->entries[nid - start_nid] = raw_ne;
} else {
nat_in_journal(sum, offset) = raw_ne;
nid_in_journal(sum, offset) = cpu_to_le32(nid);
}
if (nat_get_blkaddr(ne) == NULL_ADDR &&
add_free_nid(NM_I(sbi), nid, false) <= 0) {
write_lock(&nm_i->nat_tree_lock);
__del_from_nat_cache(nm_i, ne);
write_unlock(&nm_i->nat_tree_lock);
} else {
write_lock(&nm_i->nat_tree_lock);
__clear_nat_cache_dirty(nm_i, ne);
write_unlock(&nm_i->nat_tree_lock);
}
}
if (!flushed)
mutex_unlock(&curseg->curseg_mutex);
f2fs_put_page(page, 1);
}
static int init_node_manager(struct f2fs_sb_info *sbi)
{
struct f2fs_super_block *sb_raw = F2FS_RAW_SUPER(sbi);
struct f2fs_nm_info *nm_i = NM_I(sbi);
unsigned char *version_bitmap;
unsigned int nat_segs, nat_blocks;
nm_i->nat_blkaddr = le32_to_cpu(sb_raw->nat_blkaddr);
/* segment_count_nat includes pair segment so divide to 2. */
nat_segs = le32_to_cpu(sb_raw->segment_count_nat) >> 1;
nat_blocks = nat_segs << le32_to_cpu(sb_raw->log_blocks_per_seg);
/* not used nids: 0, node, meta, (and root counted as valid node) */
nm_i->max_nid = NAT_ENTRY_PER_BLOCK * nat_blocks - 3;
nm_i->fcnt = 0;
nm_i->nat_cnt = 0;
nm_i->ram_thresh = DEF_RAM_THRESHOLD;
INIT_RADIX_TREE(&nm_i->free_nid_root, GFP_ATOMIC);
INIT_LIST_HEAD(&nm_i->free_nid_list);
INIT_RADIX_TREE(&nm_i->nat_root, GFP_ATOMIC);
INIT_LIST_HEAD(&nm_i->nat_entries);
INIT_LIST_HEAD(&nm_i->dirty_nat_entries);
mutex_init(&nm_i->build_lock);
spin_lock_init(&nm_i->free_nid_list_lock);
rwlock_init(&nm_i->nat_tree_lock);
nm_i->next_scan_nid = le32_to_cpu(sbi->ckpt->next_free_nid);
nm_i->bitmap_size = __bitmap_size(sbi, NAT_BITMAP);
version_bitmap = __bitmap_ptr(sbi, NAT_BITMAP);
if (!version_bitmap)
return -EFAULT;
nm_i->nat_bitmap = kmemdup(version_bitmap, nm_i->bitmap_size,
GFP_KERNEL);
if (!nm_i->nat_bitmap)
return -ENOMEM;
return 0;
}
int build_node_manager(struct f2fs_sb_info *sbi)
{
int err;
sbi->nm_info = kzalloc(sizeof(struct f2fs_nm_info), GFP_KERNEL);
if (!sbi->nm_info)
return -ENOMEM;
err = init_node_manager(sbi);
if (err)
return err;
build_free_nids(sbi);
return 0;
}
void destroy_node_manager(struct f2fs_sb_info *sbi)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct free_nid *i, *next_i;
struct nat_entry *natvec[NATVEC_SIZE];
nid_t nid = 0;
unsigned int found;
if (!nm_i)
return;
/* destroy free nid list */
spin_lock(&nm_i->free_nid_list_lock);
list_for_each_entry_safe(i, next_i, &nm_i->free_nid_list, list) {
f2fs_bug_on(i->state == NID_ALLOC);
__del_from_free_nid_list(nm_i, i);
nm_i->fcnt--;
spin_unlock(&nm_i->free_nid_list_lock);
kmem_cache_free(free_nid_slab, i);
spin_lock(&nm_i->free_nid_list_lock);
}
f2fs_bug_on(nm_i->fcnt);
spin_unlock(&nm_i->free_nid_list_lock);
/* destroy nat cache */
write_lock(&nm_i->nat_tree_lock);
while ((found = __gang_lookup_nat_cache(nm_i,
nid, NATVEC_SIZE, natvec))) {
unsigned idx;
nid = nat_get_nid(natvec[found - 1]) + 1;
for (idx = 0; idx < found; idx++)
__del_from_nat_cache(nm_i, natvec[idx]);
}
f2fs_bug_on(nm_i->nat_cnt);
write_unlock(&nm_i->nat_tree_lock);
kfree(nm_i->nat_bitmap);
sbi->nm_info = NULL;
kfree(nm_i);
}
int __init create_node_manager_caches(void)
{
nat_entry_slab = f2fs_kmem_cache_create("nat_entry",
sizeof(struct nat_entry));
if (!nat_entry_slab)
return -ENOMEM;
free_nid_slab = f2fs_kmem_cache_create("free_nid",
sizeof(struct free_nid));
if (!free_nid_slab) {
kmem_cache_destroy(nat_entry_slab);
return -ENOMEM;
}
return 0;
}
void destroy_node_manager_caches(void)
{
kmem_cache_destroy(free_nid_slab);
kmem_cache_destroy(nat_entry_slab);
}
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