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Changes since last update: 

- Avoid using page structure directly for all uncompressed paths;
 
  - Fix a double-free issue when sysfs initialization fails;
 
  - Complete DAX description for erofs;
 
  - Use mtime instead since there's no (easy) way for users to control
    ctime;
 
  - Several code cleanups.
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Merge tag 'erofs-for-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs

Pull erofs updates from Gao Xiang:
 "In this cycle, we continue converting to use meta buffers for all
  remaining uncompressed paths to prepare for the upcoming subpage,
  folio and fscache features.

  We also fixed a double-free issue when sysfs initialization fails,
  which was reported by syzbot.

  Besides, in order for the userspace to control per-file timestamp
  easier, we now switch to record mtime instead of ctime with a
  compatible feature marked. And there are also some code cleanups and
  documentation update as usual.

  Summary:

   - Avoid using page structure directly for all uncompressed paths

   - Fix a double-free issue when sysfs initialization fails

   - Complete DAX description for erofs

   - Use mtime instead since there's no (easy) way for users to control
     ctime

   - Several code cleanups"

* tag 'erofs-for-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
  erofs: rename ctime to mtime
  erofs: use meta buffers for inode lookup
  erofs: use meta buffers for reading directories
  fs: erofs: add sanity check for kobject in erofs_unregister_sysfs
  erofs: refine managed inode stuffs
  erofs: clean up z_erofs_extent_lookback
  erofs: silence warnings related to impossible m_plen
  Documentation/filesystem/dax: update DAX description on erofs
  erofs: clean up preload_compressed_pages()
  erofs: get rid of `struct z_erofs_collector'
  erofs: use meta buffers for erofs_read_superblock()
This commit is contained in:
Linus Torvalds 2022-03-22 09:54:56 -07:00
parent 881b568756 a1108dcd93
commit aab4ed5816
12 changed files with 189 additions and 201 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/filesystems/dax.rst
View File

@ -23,11 +23,11 @@ on it as usual. The `DAX` code currently only supports files with a block
size equal to your kernel's `PAGE_SIZE`, so you may need to specify a block
size when creating the filesystem.
Currently 4 filesystems support `DAX`: ext2, ext4, xfs and virtiofs.
Currently 5 filesystems support `DAX`: ext2, ext4, xfs, virtiofs and erofs.
Enabling `DAX` on them is different.
Enabling DAX on ext2
--------------------
Enabling DAX on ext2 and erofs
------------------------------
When mounting the filesystem, use the ``-o dax`` option on the command line or
add 'dax' to the options in ``/etc/fstab``. This works to enable `DAX` on all files

2
Documentation/filesystems/erofs.rst
View File

@ -40,7 +40,7 @@ Here is the main features of EROFS:
Inode metadata size 32 bytes 64 bytes
Max file size 4 GB 16 EB (also limited by max. vol size)
Max uids/gids 65536 4294967296
File change time no yes (64 + 32-bit timestamp)
Per-inode timestamp no yes (64 + 32-bit timestamp)
Max hardlinks 65536 4294967296
Metadata reserved 4 bytes 14 bytes
===================== ============ =====================================

10
fs/erofs/data.c
View File

@ -28,10 +28,10 @@ void erofs_put_metabuf(struct erofs_buf *buf)
buf->page = NULL;
}
void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
void *erofs_bread(struct erofs_buf *buf, struct inode *inode,
erofs_blk_t blkaddr, enum erofs_kmap_type type)
{
struct address_space *const mapping = sb->s_bdev->bd_inode->i_mapping;
struct address_space *const mapping = inode->i_mapping;
erofs_off_t offset = blknr_to_addr(blkaddr);
pgoff_t index = offset >> PAGE_SHIFT;
struct page *page = buf->page;
@ -60,6 +60,12 @@ void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
return buf->base + (offset & ~PAGE_MASK);
}
void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
erofs_blk_t blkaddr, enum erofs_kmap_type type)
{
return erofs_bread(buf, sb->s_bdev->bd_inode, blkaddr, type);
}
static int erofs_map_blocks_flatmode(struct inode *inode,
struct erofs_map_blocks *map,
int flags)

21
fs/erofs/dir.c
View File

@ -2,6 +2,7 @@
/*
* Copyright (C) 2017-2018 HUAWEI, Inc.
* https://www.huawei.com/
* Copyright (C) 2022, Alibaba Cloud
*/
#include "internal.h"
@ -67,7 +68,7 @@ static int erofs_fill_dentries(struct inode *dir, struct dir_context *ctx,
static int erofs_readdir(struct file *f, struct dir_context *ctx)
{
struct inode *dir = file_inode(f);
struct address_space *mapping = dir->i_mapping;
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
const size_t dirsize = i_size_read(dir);
unsigned int i = ctx->pos / EROFS_BLKSIZ;
unsigned int ofs = ctx->pos % EROFS_BLKSIZ;
@ -75,26 +76,19 @@ static int erofs_readdir(struct file *f, struct dir_context *ctx)
bool initial = true;
while (ctx->pos < dirsize) {
struct page *dentry_page;
struct erofs_dirent *de;
unsigned int nameoff, maxsize;
dentry_page = read_mapping_page(mapping, i, NULL);
if (dentry_page == ERR_PTR(-ENOMEM)) {
err = -ENOMEM;
break;
} else if (IS_ERR(dentry_page)) {
de = erofs_bread(&buf, dir, i, EROFS_KMAP);
if (IS_ERR(de)) {
erofs_err(dir->i_sb,
"fail to readdir of logical block %u of nid %llu",
i, EROFS_I(dir)->nid);
err = -EFSCORRUPTED;
err = PTR_ERR(de);
break;
}
de = (struct erofs_dirent *)kmap(dentry_page);
nameoff = le16_to_cpu(de->nameoff);
if (nameoff < sizeof(struct erofs_dirent) ||
nameoff >= PAGE_SIZE) {
erofs_err(dir->i_sb,
@ -119,10 +113,6 @@ static int erofs_readdir(struct file *f, struct dir_context *ctx)
err = erofs_fill_dentries(dir, ctx, de, &ofs,
nameoff, maxsize);
skip_this:
kunmap(dentry_page);
put_page(dentry_page);
ctx->pos = blknr_to_addr(i) + ofs;
if (err)
@ -130,6 +120,7 @@ skip_this:
++i;
ofs = 0;
}
erofs_put_metabuf(&buf);
return err < 0 ? err : 0;
}

5
fs/erofs/erofs_fs.h
View File

@ -12,6 +12,7 @@
#define EROFS_SUPER_OFFSET 1024
#define EROFS_FEATURE_COMPAT_SB_CHKSUM 0x00000001
#define EROFS_FEATURE_COMPAT_MTIME 0x00000002
/*
* Any bits that aren't in EROFS_ALL_FEATURE_INCOMPAT should
@ -186,8 +187,8 @@ struct erofs_inode_extended {
__le32 i_uid;
__le32 i_gid;
__le64 i_ctime;
__le32 i_ctime_nsec;
__le64 i_mtime;
__le32 i_mtime_nsec;
__le32 i_nlink;
__u8 i_reserved2[16];
};

4
fs/erofs/inode.c
View File

@ -113,8 +113,8 @@ static void *erofs_read_inode(struct erofs_buf *buf,
set_nlink(inode, le32_to_cpu(die->i_nlink));
/* extended inode has its own timestamp */
inode->i_ctime.tv_sec = le64_to_cpu(die->i_ctime);
inode->i_ctime.tv_nsec = le32_to_cpu(die->i_ctime_nsec);
inode->i_ctime.tv_sec = le64_to_cpu(die->i_mtime);
inode->i_ctime.tv_nsec = le32_to_cpu(die->i_mtime_nsec);
inode->i_size = le64_to_cpu(die->i_size);

2
fs/erofs/internal.h
View File

@ -479,6 +479,8 @@ struct erofs_map_dev {
extern const struct file_operations erofs_file_fops;
void erofs_unmap_metabuf(struct erofs_buf *buf);
void erofs_put_metabuf(struct erofs_buf *buf);
void *erofs_bread(struct erofs_buf *buf, struct inode *inode,
erofs_blk_t blkaddr, enum erofs_kmap_type type);
void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
erofs_blk_t blkaddr, enum erofs_kmap_type type);
int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev);

50
fs/erofs/namei.c
View File

@ -2,6 +2,7 @@
/*
* Copyright (C) 2017-2018 HUAWEI, Inc.
* https://www.huawei.com/
* Copyright (C) 2022, Alibaba Cloud
*/
#include "xattr.h"
@ -86,14 +87,14 @@ static struct erofs_dirent *find_target_dirent(struct erofs_qstr *name,
return ERR_PTR(-ENOENT);
}
static struct page *find_target_block_classic(struct inode *dir,
static void *find_target_block_classic(struct erofs_buf *target,
struct inode *dir,
struct erofs_qstr *name,
int *_ndirents)
{
unsigned int startprfx, endprfx;
int head, back;
struct address_space *const mapping = dir->i_mapping;
struct page *candidate = ERR_PTR(-ENOENT);
void *candidate = ERR_PTR(-ENOENT);
startprfx = endprfx = 0;
head = 0;
@ -101,10 +102,11 @@ static struct page *find_target_block_classic(struct inode *dir,
while (head <= back) {
const int mid = head + (back - head) / 2;
struct page *page = read_mapping_page(mapping, mid, NULL);
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
struct erofs_dirent *de;
if (!IS_ERR(page)) {
struct erofs_dirent *de = kmap_atomic(page);
de = erofs_bread(&buf, dir, mid, EROFS_KMAP);
if (!IS_ERR(de)) {
const int nameoff = nameoff_from_disk(de->nameoff,
EROFS_BLKSIZ);
const int ndirents = nameoff / sizeof(*de);
@ -113,13 +115,12 @@ static struct page *find_target_block_classic(struct inode *dir,
struct erofs_qstr dname;
if (!ndirents) {
kunmap_atomic(de);
put_page(page);
erofs_put_metabuf(&buf);
erofs_err(dir->i_sb,
"corrupted dir block %d @ nid %llu",
mid, EROFS_I(dir)->nid);
DBG_BUGON(1);
page = ERR_PTR(-EFSCORRUPTED);
de = ERR_PTR(-EFSCORRUPTED);
goto out;
}
@ -135,7 +136,6 @@ static struct page *find_target_block_classic(struct inode *dir,
/* string comparison without already matched prefix */
diff = erofs_dirnamecmp(name, &dname, &matched);
kunmap_atomic(de);
if (!diff) {
*_ndirents = 0;
@ -145,11 +145,12 @@ static struct page *find_target_block_classic(struct inode *dir,
startprfx = matched;
if (!IS_ERR(candidate))
put_page(candidate);
candidate = page;
erofs_put_metabuf(target);
*target = buf;
candidate = de;
*_ndirents = ndirents;
} else {
put_page(page);
erofs_put_metabuf(&buf);
back = mid - 1;
endprfx = matched;
@ -158,8 +159,8 @@ static struct page *find_target_block_classic(struct inode *dir,
}
out: /* free if the candidate is valid */
if (!IS_ERR(candidate))
put_page(candidate);
return page;
erofs_put_metabuf(target);
return de;
}
return candidate;
}
@ -169,8 +170,7 @@ int erofs_namei(struct inode *dir,
erofs_nid_t *nid, unsigned int *d_type)
{
int ndirents;
struct page *page;
void *data;
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
struct erofs_dirent *de;
struct erofs_qstr qn;
@ -181,26 +181,20 @@ int erofs_namei(struct inode *dir,
qn.end = name->name + name->len;
ndirents = 0;
page = find_target_block_classic(dir, &qn, &ndirents);
if (IS_ERR(page))
return PTR_ERR(page);
de = find_target_block_classic(&buf, dir, &qn, &ndirents);
if (IS_ERR(de))
return PTR_ERR(de);
data = kmap_atomic(page);
/* the target page has been mapped */
if (ndirents)
de = find_target_dirent(&qn, data, EROFS_BLKSIZ, ndirents);
else
de = (struct erofs_dirent *)data;
de = find_target_dirent(&qn, (u8 *)de, EROFS_BLKSIZ, ndirents);
if (!IS_ERR(de)) {
*nid = le64_to_cpu(de->nid);
*d_type = de->file_type;
}
kunmap_atomic(data);
put_page(page);
erofs_put_metabuf(&buf);
return PTR_ERR_OR_ZERO(de);
}

21
fs/erofs/super.c
View File

@ -281,21 +281,19 @@ static int erofs_init_devices(struct super_block *sb,
static int erofs_read_superblock(struct super_block *sb)
{
struct erofs_sb_info *sbi;
struct page *page;
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
struct erofs_super_block *dsb;
unsigned int blkszbits;
void *data;
int ret;
page = read_mapping_page(sb->s_bdev->bd_inode->i_mapping, 0, NULL);
if (IS_ERR(page)) {
data = erofs_read_metabuf(&buf, sb, 0, EROFS_KMAP);
if (IS_ERR(data)) {
erofs_err(sb, "cannot read erofs superblock");
return PTR_ERR(page);
return PTR_ERR(data);
}
sbi = EROFS_SB(sb);
data = kmap(page);
dsb = (struct erofs_super_block *)(data + EROFS_SUPER_OFFSET);
ret = -EINVAL;
@ -365,8 +363,7 @@ static int erofs_read_superblock(struct super_block *sb)
if (erofs_sb_has_ztailpacking(sbi))
erofs_info(sb, "EXPERIMENTAL compressed inline data feature in use. Use at your own risk!");
out:
kunmap(page);
put_page(page);
erofs_put_metabuf(&buf);
return ret;
}
@ -535,6 +532,11 @@ static int erofs_managed_cache_releasepage(struct page *page, gfp_t gfp_mask)
return ret;
}
/*
* It will be called only on inode eviction. In case that there are still some
* decompression requests in progress, wait with rescheduling for a bit here.
* We could introduce an extra locking instead but it seems unnecessary.
*/
static void erofs_managed_cache_invalidatepage(struct page *page,
unsigned int offset,
unsigned int length)
@ -568,8 +570,7 @@ static int erofs_init_managed_cache(struct super_block *sb)
inode->i_size = OFFSET_MAX;
inode->i_mapping->a_ops = &managed_cache_aops;
mapping_set_gfp_mask(inode->i_mapping,
GFP_NOFS | __GFP_HIGHMEM | __GFP_MOVABLE);
mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
sbi->managed_cache = inode;
return 0;
}

2
fs/erofs/sysfs.c
View File

@ -221,10 +221,12 @@ void erofs_unregister_sysfs(struct super_block *sb)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
if (sbi->s_kobj.state_in_sysfs) {
kobject_del(&sbi->s_kobj);
kobject_put(&sbi->s_kobj);
wait_for_completion(&sbi->s_kobj_unregister);
}
}
int __init erofs_init_sysfs(void)
{

180
fs/erofs/zdata.c
View File

@ -192,7 +192,10 @@ enum z_erofs_collectmode {
COLLECT_PRIMARY_FOLLOWED,
};
struct z_erofs_collector {
struct z_erofs_decompress_frontend {
struct inode *const inode;
struct erofs_map_blocks map;
struct z_erofs_pagevec_ctor vector;
struct z_erofs_pcluster *pcl, *tailpcl;
@ -202,13 +205,6 @@ struct z_erofs_collector {
z_erofs_next_pcluster_t owned_head;
enum z_erofs_collectmode mode;
};
struct z_erofs_decompress_frontend {
struct inode *const inode;
struct z_erofs_collector clt;
struct erofs_map_blocks map;
bool readahead;
/* used for applying cache strategy on the fly */
@ -216,30 +212,30 @@ struct z_erofs_decompress_frontend {
erofs_off_t headoffset;
};
#define COLLECTOR_INIT() { \
.owned_head = Z_EROFS_PCLUSTER_TAIL, \
.mode = COLLECT_PRIMARY_FOLLOWED }
#define DECOMPRESS_FRONTEND_INIT(__i) { \
.inode = __i, .clt = COLLECTOR_INIT(), \
.backmost = true, }
.inode = __i, .owned_head = Z_EROFS_PCLUSTER_TAIL, \
.mode = COLLECT_PRIMARY_FOLLOWED }
static struct page *z_pagemap_global[Z_EROFS_VMAP_GLOBAL_PAGES];
static DEFINE_MUTEX(z_pagemap_global_lock);
static void preload_compressed_pages(struct z_erofs_collector *clt,
struct address_space *mc,
static void z_erofs_bind_cache(struct z_erofs_decompress_frontend *fe,
enum z_erofs_cache_alloctype type,
struct page **pagepool)
{
struct z_erofs_pcluster *pcl = clt->pcl;
struct address_space *mc = MNGD_MAPPING(EROFS_I_SB(fe->inode));
struct z_erofs_pcluster *pcl = fe->pcl;
bool standalone = true;
/*
* optimistic allocation without direct reclaim since inplace I/O
* can be used if low memory otherwise.
*/
gfp_t gfp = (mapping_gfp_mask(mc) & ~__GFP_DIRECT_RECLAIM) |
__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN;
struct page **pages;
pgoff_t index;
if (clt->mode < COLLECT_PRIMARY_FOLLOWED)
if (fe->mode < COLLECT_PRIMARY_FOLLOWED)
return;
pages = pcl->compressed_pages;
@ -288,7 +284,7 @@ static void preload_compressed_pages(struct z_erofs_collector *clt,
* managed cache since it can be moved to the bypass queue instead.
*/
if (standalone)
clt->mode = COLLECT_PRIMARY_FOLLOWED_NOINPLACE;
fe->mode = COLLECT_PRIMARY_FOLLOWED_NOINPLACE;
}
/* called by erofs_shrinker to get rid of all compressed_pages */
@ -350,47 +346,47 @@ int erofs_try_to_free_cached_page(struct page *page)
}
/* page_type must be Z_EROFS_PAGE_TYPE_EXCLUSIVE */
static bool z_erofs_try_inplace_io(struct z_erofs_collector *clt,
static bool z_erofs_try_inplace_io(struct z_erofs_decompress_frontend *fe,
struct page *page)
{
struct z_erofs_pcluster *const pcl = clt->pcl;
struct z_erofs_pcluster *const pcl = fe->pcl;
while (clt->icpage_ptr > pcl->compressed_pages)
if (!cmpxchg(--clt->icpage_ptr, NULL, page))
while (fe->icpage_ptr > pcl->compressed_pages)
if (!cmpxchg(--fe->icpage_ptr, NULL, page))
return true;
return false;
}
/* callers must be with collection lock held */
static int z_erofs_attach_page(struct z_erofs_collector *clt,
static int z_erofs_attach_page(struct z_erofs_decompress_frontend *fe,
struct page *page, enum z_erofs_page_type type,
bool pvec_safereuse)
{
int ret;
/* give priority for inplaceio */
if (clt->mode >= COLLECT_PRIMARY &&
if (fe->mode >= COLLECT_PRIMARY &&
type == Z_EROFS_PAGE_TYPE_EXCLUSIVE &&
z_erofs_try_inplace_io(clt, page))
z_erofs_try_inplace_io(fe, page))
return 0;
ret = z_erofs_pagevec_enqueue(&clt->vector, page, type,
ret = z_erofs_pagevec_enqueue(&fe->vector, page, type,
pvec_safereuse);
clt->cl->vcnt += (unsigned int)ret;
fe->cl->vcnt += (unsigned int)ret;
return ret ? 0 : -EAGAIN;
}
static void z_erofs_try_to_claim_pcluster(struct z_erofs_collector *clt)
static void z_erofs_try_to_claim_pcluster(struct z_erofs_decompress_frontend *f)
{
struct z_erofs_pcluster *pcl = clt->pcl;
z_erofs_next_pcluster_t *owned_head = &clt->owned_head;
struct z_erofs_pcluster *pcl = f->pcl;
z_erofs_next_pcluster_t *owned_head = &f->owned_head;
/* type 1, nil pcluster (this pcluster doesn't belong to any chain.) */
if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_NIL,
*owned_head) == Z_EROFS_PCLUSTER_NIL) {
*owned_head = &pcl->next;
/* so we can attach this pcluster to our submission chain. */
clt->mode = COLLECT_PRIMARY_FOLLOWED;
f->mode = COLLECT_PRIMARY_FOLLOWED;
return;
}
@ -401,24 +397,24 @@ static void z_erofs_try_to_claim_pcluster(struct z_erofs_collector *clt)
if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL,
*owned_head) == Z_EROFS_PCLUSTER_TAIL) {
*owned_head = Z_EROFS_PCLUSTER_TAIL;
clt->mode = COLLECT_PRIMARY_HOOKED;
clt->tailpcl = NULL;
f->mode = COLLECT_PRIMARY_HOOKED;
f->tailpcl = NULL;
return;
}
/* type 3, it belongs to a chain, but it isn't the end of the chain */
clt->mode = COLLECT_PRIMARY;
f->mode = COLLECT_PRIMARY;
}
static int z_erofs_lookup_collection(struct z_erofs_collector *clt,
static int z_erofs_lookup_collection(struct z_erofs_decompress_frontend *fe,
struct inode *inode,
struct erofs_map_blocks *map)
{
struct z_erofs_pcluster *pcl = clt->pcl;
struct z_erofs_pcluster *pcl = fe->pcl;
struct z_erofs_collection *cl;
unsigned int length;
/* to avoid unexpected loop formed by corrupted images */
if (clt->owned_head == &pcl->next || pcl == clt->tailpcl) {
if (fe->owned_head == &pcl->next || pcl == fe->tailpcl) {
DBG_BUGON(1);
return -EFSCORRUPTED;
}
@ -449,15 +445,15 @@ static int z_erofs_lookup_collection(struct z_erofs_collector *clt,
}
mutex_lock(&cl->lock);
/* used to check tail merging loop due to corrupted images */
if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL)
clt->tailpcl = pcl;
if (fe->owned_head == Z_EROFS_PCLUSTER_TAIL)
fe->tailpcl = pcl;
z_erofs_try_to_claim_pcluster(clt);
clt->cl = cl;
z_erofs_try_to_claim_pcluster(fe);
fe->cl = cl;
return 0;
}
static int z_erofs_register_collection(struct z_erofs_collector *clt,
static int z_erofs_register_collection(struct z_erofs_decompress_frontend *fe,
struct inode *inode,
struct erofs_map_blocks *map)
{
@ -485,8 +481,8 @@ static int z_erofs_register_collection(struct z_erofs_collector *clt,
Z_EROFS_PCLUSTER_FULL_LENGTH : 0);
/* new pclusters should be claimed as type 1, primary and followed */
pcl->next = clt->owned_head;
clt->mode = COLLECT_PRIMARY_FOLLOWED;
pcl->next = fe->owned_head;
fe->mode = COLLECT_PRIMARY_FOLLOWED;
cl = z_erofs_primarycollection(pcl);
cl->pageofs = map->m_la & ~PAGE_MASK;
@ -512,18 +508,18 @@ static int z_erofs_register_collection(struct z_erofs_collector *clt,
}
if (grp != &pcl->obj) {
clt->pcl = container_of(grp,
fe->pcl = container_of(grp,
struct z_erofs_pcluster, obj);
err = -EEXIST;
goto err_out;
}
}
/* used to check tail merging loop due to corrupted images */
if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL)
clt->tailpcl = pcl;
clt->owned_head = &pcl->next;
clt->pcl = pcl;
clt->cl = cl;
if (fe->owned_head == Z_EROFS_PCLUSTER_TAIL)
fe->tailpcl = pcl;
fe->owned_head = &pcl->next;
fe->pcl = pcl;
fe->cl = cl;
return 0;
err_out:
@ -532,18 +528,18 @@ err_out:
return err;
}
static int z_erofs_collector_begin(struct z_erofs_collector *clt,
static int z_erofs_collector_begin(struct z_erofs_decompress_frontend *fe,
struct inode *inode,
struct erofs_map_blocks *map)
{
struct erofs_workgroup *grp;
int ret;
DBG_BUGON(clt->cl);
DBG_BUGON(fe->cl);
/* must be Z_EROFS_PCLUSTER_TAIL or pointed to previous collection */
DBG_BUGON(clt->owned_head == Z_EROFS_PCLUSTER_NIL);
DBG_BUGON(clt->owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED);
DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_NIL);
DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED);
if (map->m_flags & EROFS_MAP_META) {
if ((map->m_pa & ~PAGE_MASK) + map->m_plen > PAGE_SIZE) {
@ -555,28 +551,28 @@ static int z_erofs_collector_begin(struct z_erofs_collector *clt,
grp = erofs_find_workgroup(inode->i_sb, map->m_pa >> PAGE_SHIFT);
if (grp) {
clt->pcl = container_of(grp, struct z_erofs_pcluster, obj);
fe->pcl = container_of(grp, struct z_erofs_pcluster, obj);
} else {
tailpacking:
ret = z_erofs_register_collection(clt, inode, map);
ret = z_erofs_register_collection(fe, inode, map);
if (!ret)
goto out;
if (ret != -EEXIST)
return ret;
}
ret = z_erofs_lookup_collection(clt, inode, map);
ret = z_erofs_lookup_collection(fe, inode, map);
if (ret) {
erofs_workgroup_put(&clt->pcl->obj);
erofs_workgroup_put(&fe->pcl->obj);
return ret;
}
out:
z_erofs_pagevec_ctor_init(&clt->vector, Z_EROFS_NR_INLINE_PAGEVECS,
clt->cl->pagevec, clt->cl->vcnt);
z_erofs_pagevec_ctor_init(&fe->vector, Z_EROFS_NR_INLINE_PAGEVECS,
fe->cl->pagevec, fe->cl->vcnt);
/* since file-backed online pages are traversed in reverse order */
clt->icpage_ptr = clt->pcl->compressed_pages +
z_erofs_pclusterpages(clt->pcl);
fe->icpage_ptr = fe->pcl->compressed_pages +
z_erofs_pclusterpages(fe->pcl);
return 0;
}
@ -610,24 +606,24 @@ static void z_erofs_collection_put(struct z_erofs_collection *cl)
erofs_workgroup_put(&pcl->obj);
}
static bool z_erofs_collector_end(struct z_erofs_collector *clt)
static bool z_erofs_collector_end(struct z_erofs_decompress_frontend *fe)
{
struct z_erofs_collection *cl = clt->cl;
struct z_erofs_collection *cl = fe->cl;
if (!cl)
return false;
z_erofs_pagevec_ctor_exit(&clt->vector, false);
z_erofs_pagevec_ctor_exit(&fe->vector, false);
mutex_unlock(&cl->lock);
/*
* if all pending pages are added, don't hold its reference
* any longer if the pcluster isn't hosted by ourselves.
*/
if (clt->mode < COLLECT_PRIMARY_FOLLOWED_NOINPLACE)
if (fe->mode < COLLECT_PRIMARY_FOLLOWED_NOINPLACE)
z_erofs_collection_put(cl);
clt->cl = NULL;
fe->cl = NULL;
return true;
}
@ -651,7 +647,6 @@ static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe,
struct inode *const inode = fe->inode;
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
struct erofs_map_blocks *const map = &fe->map;
struct z_erofs_collector *const clt = &fe->clt;
const loff_t offset = page_offset(page);
bool tight = true;
@ -672,7 +667,7 @@ repeat:
if (offset + cur >= map->m_la &&
offset + cur < map->m_la + map->m_llen) {
/* didn't get a valid collection previously (very rare) */
if (!clt->cl)
if (!fe->cl)
goto restart_now;
goto hitted;
}
@ -680,7 +675,7 @@ repeat:
/* go ahead the next map_blocks */
erofs_dbg("%s: [out-of-range] pos %llu", __func__, offset + cur);
if (z_erofs_collector_end(clt))
if (z_erofs_collector_end(fe))
fe->backmost = false;
map->m_la = offset + cur;
@ -693,11 +688,11 @@ restart_now:
if (!(map->m_flags & EROFS_MAP_MAPPED))
goto hitted;
err = z_erofs_collector_begin(clt, inode, map);
err = z_erofs_collector_begin(fe, inode, map);
if (err)
goto err_out;
if (z_erofs_is_inline_pcluster(clt->pcl)) {
if (z_erofs_is_inline_pcluster(fe->pcl)) {
void *mp;
mp = erofs_read_metabuf(&fe->map.buf, inode->i_sb,
@ -709,20 +704,18 @@ restart_now:
goto err_out;
}
get_page(fe->map.buf.page);
WRITE_ONCE(clt->pcl->compressed_pages[0], fe->map.buf.page);
clt->mode = COLLECT_PRIMARY_FOLLOWED_NOINPLACE;
WRITE_ONCE(fe->pcl->compressed_pages[0], fe->map.buf.page);
fe->mode = COLLECT_PRIMARY_FOLLOWED_NOINPLACE;
} else {
/* preload all compressed pages (can change mode if needed) */
/* bind cache first when cached decompression is preferred */
if (should_alloc_managed_pages(fe, sbi->opt.cache_strategy,
map->m_la))
cache_strategy = TRYALLOC;
else
cache_strategy = DONTALLOC;
preload_compressed_pages(clt, MNGD_MAPPING(sbi),
cache_strategy, pagepool);
z_erofs_bind_cache(fe, cache_strategy, pagepool);
}
hitted:
/*
* Ensure the current partial page belongs to this submit chain rather
@ -730,8 +723,8 @@ hitted:
* those chains are handled asynchronously thus the page cannot be used
* for inplace I/O or pagevec (should be processed in strict order.)
*/
tight &= (clt->mode >= COLLECT_PRIMARY_HOOKED &&
clt->mode != COLLECT_PRIMARY_FOLLOWED_NOINPLACE);
tight &= (fe->mode >= COLLECT_PRIMARY_HOOKED &&
fe->mode != COLLECT_PRIMARY_FOLLOWED_NOINPLACE);
cur = end - min_t(unsigned int, offset + end - map->m_la, end);
if (!(map->m_flags & EROFS_MAP_MAPPED)) {
@ -746,18 +739,18 @@ hitted:
Z_EROFS_VLE_PAGE_TYPE_TAIL_SHARED));
if (cur)
tight &= (clt->mode >= COLLECT_PRIMARY_FOLLOWED);
tight &= (fe->mode >= COLLECT_PRIMARY_FOLLOWED);
retry:
err = z_erofs_attach_page(clt, page, page_type,
clt->mode >= COLLECT_PRIMARY_FOLLOWED);
err = z_erofs_attach_page(fe, page, page_type,
fe->mode >= COLLECT_PRIMARY_FOLLOWED);
/* should allocate an additional short-lived page for pagevec */
if (err == -EAGAIN) {
struct page *const newpage =
alloc_page(GFP_NOFS | __GFP_NOFAIL);
set_page_private(newpage, Z_EROFS_SHORTLIVED_PAGE);
err = z_erofs_attach_page(clt, newpage,
err = z_erofs_attach_page(fe, newpage,
Z_EROFS_PAGE_TYPE_EXCLUSIVE, true);
if (!err)
goto retry;
@ -773,7 +766,7 @@ retry:
/* bump up the number of spiltted parts of a page */
++spiltted;
/* also update nr_pages */
clt->cl->nr_pages = max_t(pgoff_t, clt->cl->nr_pages, index + 1);
fe->cl->nr_pages = max_t(pgoff_t, fe->cl->nr_pages, index + 1);
next_part:
/* can be used for verification */
map->m_llen = offset + cur - map->m_la;
@ -1098,10 +1091,10 @@ static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io,
static struct page *pickup_page_for_submission(struct z_erofs_pcluster *pcl,
unsigned int nr,
struct page **pagepool,
struct address_space *mc,
gfp_t gfp)
struct address_space *mc)
{
const pgoff_t index = pcl->obj.index;
gfp_t gfp = mapping_gfp_mask(mc);
bool tocache = false;
struct address_space *mapping;
@ -1309,7 +1302,7 @@ static void z_erofs_submit_queue(struct super_block *sb,
z_erofs_next_pcluster_t qtail[NR_JOBQUEUES];
struct z_erofs_decompressqueue *q[NR_JOBQUEUES];
void *bi_private;
z_erofs_next_pcluster_t owned_head = f->clt.owned_head;
z_erofs_next_pcluster_t owned_head = f->owned_head;
/* bio is NULL initially, so no need to initialize last_{index,bdev} */
pgoff_t last_index;
struct block_device *last_bdev;
@ -1357,8 +1350,7 @@ static void z_erofs_submit_queue(struct super_block *sb,
struct page *page;
page = pickup_page_for_submission(pcl, i++, pagepool,
MNGD_MAPPING(sbi),
GFP_NOFS);
MNGD_MAPPING(sbi));
if (!page)
continue;
@ -1416,7 +1408,7 @@ static void z_erofs_runqueue(struct super_block *sb,
{
struct z_erofs_decompressqueue io[NR_JOBQUEUES];
if (f->clt.owned_head == Z_EROFS_PCLUSTER_TAIL)
if (f->owned_head == Z_EROFS_PCLUSTER_TAIL)
return;
z_erofs_submit_queue(sb, f, pagepool, io, &force_fg);
@ -1516,7 +1508,7 @@ static int z_erofs_readpage(struct file *file, struct page *page)
err = z_erofs_do_read_page(&f, page, &pagepool);
z_erofs_pcluster_readmore(&f, NULL, 0, &pagepool, false);
(void)z_erofs_collector_end(&f.clt);
(void)z_erofs_collector_end(&f);
/* if some compressed cluster ready, need submit them anyway */
z_erofs_runqueue(inode->i_sb, &f, &pagepool,
@ -1566,7 +1558,7 @@ static void z_erofs_readahead(struct readahead_control *rac)
put_page(page);
}
z_erofs_pcluster_readmore(&f, rac, 0, &pagepool, false);
(void)z_erofs_collector_end(&f.clt);
(void)z_erofs_collector_end(&f);
z_erofs_runqueue(inode->i_sb, &f, &pagepool,
z_erofs_get_sync_decompress_policy(sbi, nr_pages));

31
fs/erofs/zmap.c
View File

@ -431,20 +431,13 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
unsigned int lookback_distance)
{
struct erofs_inode *const vi = EROFS_I(m->inode);
struct erofs_map_blocks *const map = m->map;
const unsigned int lclusterbits = vi->z_logical_clusterbits;
unsigned long lcn = m->lcn;
while (m->lcn >= lookback_distance) {
unsigned long lcn = m->lcn - lookback_distance;
int err;
if (lcn < lookback_distance) {
erofs_err(m->inode->i_sb,
"bogus lookback distance @ nid %llu", vi->nid);
DBG_BUGON(1);
return -EFSCORRUPTED;
}
/* load extent head logical cluster if needed */
lcn -= lookback_distance;
err = z_erofs_load_cluster_from_disk(m, lcn, false);
if (err)
return err;
@ -458,13 +451,14 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
DBG_BUGON(1);
return -EFSCORRUPTED;
}
return z_erofs_extent_lookback(m, m->delta[0]);
lookback_distance = m->delta[0];
continue;
case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD1:
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD2:
m->headtype = m->type;
map->m_la = (lcn << lclusterbits) | m->clusterofs;
break;
m->map->m_la = (lcn << lclusterbits) | m->clusterofs;
return 0;
default:
erofs_err(m->inode->i_sb,
"unknown type %u @ lcn %lu of nid %llu",
@ -472,7 +466,12 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
DBG_BUGON(1);
return -EOPNOTSUPP;
}
return 0;
}
erofs_err(m->inode->i_sb, "bogus lookback distance @ nid %llu",
vi->nid);
DBG_BUGON(1);
return -EFSCORRUPTED;
}
static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
@ -494,7 +493,7 @@ static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
!(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1)) ||
((m->headtype == Z_EROFS_VLE_CLUSTER_TYPE_HEAD2) &&
!(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_2))) {
map->m_plen = 1 << lclusterbits;
map->m_plen = 1ULL << lclusterbits;
return 0;
}
lcn = m->lcn + 1;
@ -540,7 +539,7 @@ static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
return -EFSCORRUPTED;
}
out:
map->m_plen = m->compressedlcs << lclusterbits;
map->m_plen = (u64)m->compressedlcs << lclusterbits;
return 0;
err_bonus_cblkcnt:
erofs_err(m->inode->i_sb,