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erofs: convert z_erofs_onlinepage_.* to folios

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Online folios are locked file-backed folios which will eventually
keep decoded (e.g. decompressed) data of each inode for end users to
utilize.  It may belong to a few pclusters and contain other data (e.g.
compressed data for inplace I/Os) temporarily in a time-sharing manner
to reduce memory footprints for low-ended storage devices with high
latencies under heary I/O pressure.

Apart from folio_end_read() usage, it's a straight-forward conversion.

Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240305091448.1384242-1-hsiangkao@linux.alibaba.com
This commit is contained in:
Gao Xiang 2024-03-05 17:14:43 +08:00
parent 90d35da658
commit d136d33586
1 changed files with 22 additions and 28 deletions
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50
fs/erofs/zdata.c
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@ -117,46 +117,39 @@ static inline unsigned int z_erofs_pclusterpages(struct z_erofs_pcluster *pcl)
}
/*
* bit 30: I/O error occurred on this page
* bit 0 - 29: remaining parts to complete this page
* bit 30: I/O error occurred on this folio
* bit 0 - 29: remaining parts to complete this folio
*/
#define Z_EROFS_PAGE_EIO (1 << 30)
#define Z_EROFS_FOLIO_EIO (1 << 30)
static inline void z_erofs_onlinepage_init(struct page *page)
static void z_erofs_onlinefolio_init(struct folio *folio)
{
union {
atomic_t o;
unsigned long v;
void *v;
} u = { .o = ATOMIC_INIT(1) };
set_page_private(page, u.v);
smp_wmb();
SetPagePrivate(page);
folio->private = u.v; /* valid only if file-backed folio is locked */
}
static inline void z_erofs_onlinepage_split(struct page *page)
static void z_erofs_onlinefolio_split(struct folio *folio)
{
atomic_inc((atomic_t *)&page->private);
atomic_inc((atomic_t *)&folio->private);
}
static void z_erofs_onlinepage_endio(struct page *page, int err)
static void z_erofs_onlinefolio_end(struct folio *folio, int err)
{
int orig, v;
DBG_BUGON(!PagePrivate(page));
do {
orig = atomic_read((atomic_t *)&page->private);
v = (orig - 1) | (err ? Z_EROFS_PAGE_EIO : 0);
} while (atomic_cmpxchg((atomic_t *)&page->private, orig, v) != orig);
orig = atomic_read((atomic_t *)&folio->private);
v = (orig - 1) | (err ? Z_EROFS_FOLIO_EIO : 0);
} while (atomic_cmpxchg((atomic_t *)&folio->private, orig, v) != orig);
if (!(v & ~Z_EROFS_PAGE_EIO)) {
set_page_private(page, 0);
ClearPagePrivate(page);
if (!(v & Z_EROFS_PAGE_EIO))
SetPageUptodate(page);
unlock_page(page);
}
if (v & ~Z_EROFS_FOLIO_EIO)
return;
folio->private = 0;
folio_end_read(folio, !(v & Z_EROFS_FOLIO_EIO));
}
#define Z_EROFS_ONSTACK_PAGES 32
@ -965,6 +958,7 @@ static int z_erofs_read_fragment(struct super_block *sb, struct page *page,
static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe,
struct page *page, bool ra)
{
struct folio *folio = page_folio(page);
struct inode *const inode = fe->inode;
struct erofs_map_blocks *const map = &fe->map;
const loff_t offset = page_offset(page);
@ -973,7 +967,7 @@ static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe,
unsigned int cur, end, len, split;
int err = 0;
z_erofs_onlinepage_init(page);
z_erofs_onlinefolio_init(folio);
split = 0;
end = PAGE_SIZE;
repeat:
@ -1035,7 +1029,7 @@ repeat:
if (err)
goto out;
z_erofs_onlinepage_split(page);
z_erofs_onlinefolio_split(folio);
if (fe->pcl->pageofs_out != (map->m_la & ~PAGE_MASK))
fe->pcl->multibases = true;
if (fe->pcl->length < offset + end - map->m_la) {
@ -1056,7 +1050,7 @@ next_part:
goto repeat;
out:
z_erofs_onlinepage_endio(page, err);
z_erofs_onlinefolio_end(folio, err);
return err;
}
@ -1159,7 +1153,7 @@ static void z_erofs_fill_other_copies(struct z_erofs_decompress_backend *be,
cur += len;
}
kunmap_local(dst);
z_erofs_onlinepage_endio(bvi->bvec.page, err);
z_erofs_onlinefolio_end(page_folio(bvi->bvec.page), err);
list_del(p);
kfree(bvi);
}
@ -1316,7 +1310,7 @@ static int z_erofs_decompress_pcluster(struct z_erofs_decompress_backend *be,
/* recycle all individual short-lived pages */
if (z_erofs_put_shortlivedpage(be->pagepool, page))
continue;
z_erofs_onlinepage_endio(page, err);
z_erofs_onlinefolio_end(page_folio(page), err);
}
if (be->decompressed_pages != be->onstack_pages)