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authorLinus Torvalds <torvalds@linux-foundation.org>2022-06-01 11:54:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-06-01 11:54:29 -0700
commit8171acb8bc9b33f3ed827f0615b24f7a06495cd0 (patch)
treec8a78269ea6f58009664c76989e56a08d0c7e4fe /fs/erofs/zdata.c
parente5b0208713326cdd3f0a83540e31f9b6f280da38 (diff)
parent4398d3c31b582db0d640b23434bf344a6c8df57c (diff)
Merge tag 'erofs-for-5.19-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs
Pull more erofs updates from Gao Xiang: "This is a follow-up to the main updates, including some fixes of fscache mode related to compressed inodes and a cachefiles tracepoint. There is also a patch to fix an unexpected decompression strategy change due to a cleanup in the past. All the fixes are quite small. Apart from these, documentation is also updated for a better description of recent new features. In addition, this has some trivial cleanups without actual code logic changes, so I could have a more recent codebase to work on folios and avoiding the PG_error page flag for the next cycle. Summary: - Leave compressed inodes unsupported in fscache mode for now - Avoid crash when using tracepoint cachefiles_prep_read - Fix `backmost' behavior due to a recent cleanup - Update documentation for better description of recent new features - Several decompression cleanups w/o logical change" * tag 'erofs-for-5.19-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs: erofs: fix 'backmost' member of z_erofs_decompress_frontend erofs: simplify z_erofs_pcluster_readmore() erofs: get rid of label `restart_now' erofs: get rid of `struct z_erofs_collection' erofs: update documentation erofs: fix crash when enable tracepoint cachefiles_prep_read erofs: leave compressed inodes unsupported in fscache mode for now
Diffstat (limited to 'fs/erofs/zdata.c')
-rw-r--r--fs/erofs/zdata.c167
1 files changed, 67 insertions, 100 deletions
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 95efc127b2ba..724bb57075f6 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -199,7 +199,6 @@ struct z_erofs_decompress_frontend {
struct z_erofs_pagevec_ctor vector;
struct z_erofs_pcluster *pcl, *tailpcl;
- struct z_erofs_collection *cl;
/* a pointer used to pick up inplace I/O pages */
struct page **icpage_ptr;
z_erofs_next_pcluster_t owned_head;
@@ -214,7 +213,7 @@ struct z_erofs_decompress_frontend {
#define DECOMPRESS_FRONTEND_INIT(__i) { \
.inode = __i, .owned_head = Z_EROFS_PCLUSTER_TAIL, \
- .mode = COLLECT_PRIMARY_FOLLOWED }
+ .mode = COLLECT_PRIMARY_FOLLOWED, .backmost = true }
static struct page *z_pagemap_global[Z_EROFS_VMAP_GLOBAL_PAGES];
static DEFINE_MUTEX(z_pagemap_global_lock);
@@ -357,7 +356,7 @@ static bool z_erofs_try_inplace_io(struct z_erofs_decompress_frontend *fe,
return false;
}
-/* callers must be with collection lock held */
+/* callers must be with pcluster lock held */
static int z_erofs_attach_page(struct z_erofs_decompress_frontend *fe,
struct page *page, enum z_erofs_page_type type,
bool pvec_safereuse)
@@ -372,7 +371,7 @@ static int z_erofs_attach_page(struct z_erofs_decompress_frontend *fe,
ret = z_erofs_pagevec_enqueue(&fe->vector, page, type,
pvec_safereuse);
- fe->cl->vcnt += (unsigned int)ret;
+ fe->pcl->vcnt += (unsigned int)ret;
return ret ? 0 : -EAGAIN;
}
@@ -405,12 +404,11 @@ static void z_erofs_try_to_claim_pcluster(struct z_erofs_decompress_frontend *f)
f->mode = COLLECT_PRIMARY;
}
-static int z_erofs_lookup_collection(struct z_erofs_decompress_frontend *fe,
- struct inode *inode,
- struct erofs_map_blocks *map)
+static int z_erofs_lookup_pcluster(struct z_erofs_decompress_frontend *fe,
+ struct inode *inode,
+ struct erofs_map_blocks *map)
{
struct z_erofs_pcluster *pcl = fe->pcl;
- struct z_erofs_collection *cl;
unsigned int length;
/* to avoid unexpected loop formed by corrupted images */
@@ -419,8 +417,7 @@ static int z_erofs_lookup_collection(struct z_erofs_decompress_frontend *fe,
return -EFSCORRUPTED;
}
- cl = z_erofs_primarycollection(pcl);
- if (cl->pageofs != (map->m_la & ~PAGE_MASK)) {
+ if (pcl->pageofs_out != (map->m_la & ~PAGE_MASK)) {
DBG_BUGON(1);
return -EFSCORRUPTED;
}
@@ -443,23 +440,21 @@ static int z_erofs_lookup_collection(struct z_erofs_decompress_frontend *fe,
length = READ_ONCE(pcl->length);
}
}
- mutex_lock(&cl->lock);
+ mutex_lock(&pcl->lock);
/* used to check tail merging loop due to corrupted images */
if (fe->owned_head == Z_EROFS_PCLUSTER_TAIL)
fe->tailpcl = pcl;
z_erofs_try_to_claim_pcluster(fe);
- fe->cl = cl;
return 0;
}
-static int z_erofs_register_collection(struct z_erofs_decompress_frontend *fe,
- struct inode *inode,
- struct erofs_map_blocks *map)
+static int z_erofs_register_pcluster(struct z_erofs_decompress_frontend *fe,
+ struct inode *inode,
+ struct erofs_map_blocks *map)
{
bool ztailpacking = map->m_flags & EROFS_MAP_META;
struct z_erofs_pcluster *pcl;
- struct z_erofs_collection *cl;
struct erofs_workgroup *grp;
int err;
@@ -482,17 +477,15 @@ static int z_erofs_register_collection(struct z_erofs_decompress_frontend *fe,
/* new pclusters should be claimed as type 1, primary and followed */
pcl->next = fe->owned_head;
+ pcl->pageofs_out = map->m_la & ~PAGE_MASK;
fe->mode = COLLECT_PRIMARY_FOLLOWED;
- cl = z_erofs_primarycollection(pcl);
- cl->pageofs = map->m_la & ~PAGE_MASK;
-
/*
* lock all primary followed works before visible to others
* and mutex_trylock *never* fails for a new pcluster.
*/
- mutex_init(&cl->lock);
- DBG_BUGON(!mutex_trylock(&cl->lock));
+ mutex_init(&pcl->lock);
+ DBG_BUGON(!mutex_trylock(&pcl->lock));
if (ztailpacking) {
pcl->obj.index = 0; /* which indicates ztailpacking */
@@ -519,11 +512,10 @@ static int z_erofs_register_collection(struct z_erofs_decompress_frontend *fe,
fe->tailpcl = pcl;
fe->owned_head = &pcl->next;
fe->pcl = pcl;
- fe->cl = cl;
return 0;
err_out:
- mutex_unlock(&cl->lock);
+ mutex_unlock(&pcl->lock);
z_erofs_free_pcluster(pcl);
return err;
}
@@ -535,9 +527,9 @@ static int z_erofs_collector_begin(struct z_erofs_decompress_frontend *fe,
struct erofs_workgroup *grp;
int ret;
- DBG_BUGON(fe->cl);
+ DBG_BUGON(fe->pcl);
- /* must be Z_EROFS_PCLUSTER_TAIL or pointed to previous collection */
+ /* must be Z_EROFS_PCLUSTER_TAIL or pointed to previous pcluster */
DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_NIL);
DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED);
@@ -554,14 +546,14 @@ static int z_erofs_collector_begin(struct z_erofs_decompress_frontend *fe,
fe->pcl = container_of(grp, struct z_erofs_pcluster, obj);
} else {
tailpacking:
- ret = z_erofs_register_collection(fe, inode, map);
+ ret = z_erofs_register_pcluster(fe, inode, map);
if (!ret)
goto out;
if (ret != -EEXIST)
return ret;
}
- ret = z_erofs_lookup_collection(fe, inode, map);
+ ret = z_erofs_lookup_pcluster(fe, inode, map);
if (ret) {
erofs_workgroup_put(&fe->pcl->obj);
return ret;
@@ -569,7 +561,7 @@ tailpacking:
out:
z_erofs_pagevec_ctor_init(&fe->vector, Z_EROFS_NR_INLINE_PAGEVECS,
- fe->cl->pagevec, fe->cl->vcnt);
+ fe->pcl->pagevec, fe->pcl->vcnt);
/* since file-backed online pages are traversed in reverse order */
fe->icpage_ptr = fe->pcl->compressed_pages +
z_erofs_pclusterpages(fe->pcl);
@@ -582,48 +574,36 @@ out:
*/
static void z_erofs_rcu_callback(struct rcu_head *head)
{
- struct z_erofs_collection *const cl =
- container_of(head, struct z_erofs_collection, rcu);
-
- z_erofs_free_pcluster(container_of(cl, struct z_erofs_pcluster,
- primary_collection));
+ z_erofs_free_pcluster(container_of(head,
+ struct z_erofs_pcluster, rcu));
}
void erofs_workgroup_free_rcu(struct erofs_workgroup *grp)
{
struct z_erofs_pcluster *const pcl =
container_of(grp, struct z_erofs_pcluster, obj);
- struct z_erofs_collection *const cl = z_erofs_primarycollection(pcl);
-
- call_rcu(&cl->rcu, z_erofs_rcu_callback);
-}
-static void z_erofs_collection_put(struct z_erofs_collection *cl)
-{
- struct z_erofs_pcluster *const pcl =
- container_of(cl, struct z_erofs_pcluster, primary_collection);
-
- erofs_workgroup_put(&pcl->obj);
+ call_rcu(&pcl->rcu, z_erofs_rcu_callback);
}
static bool z_erofs_collector_end(struct z_erofs_decompress_frontend *fe)
{
- struct z_erofs_collection *cl = fe->cl;
+ struct z_erofs_pcluster *pcl = fe->pcl;
- if (!cl)
+ if (!pcl)
return false;
z_erofs_pagevec_ctor_exit(&fe->vector, false);
- mutex_unlock(&cl->lock);
+ mutex_unlock(&pcl->lock);
/*
* if all pending pages are added, don't hold its reference
* any longer if the pcluster isn't hosted by ourselves.
*/
if (fe->mode < COLLECT_PRIMARY_FOLLOWED_NOINPLACE)
- z_erofs_collection_put(cl);
+ erofs_workgroup_put(&pcl->obj);
- fe->cl = NULL;
+ fe->pcl = NULL;
return true;
}
@@ -663,28 +643,23 @@ static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe,
repeat:
cur = end - 1;
- /* lucky, within the range of the current map_blocks */
- if (offset + cur >= map->m_la &&
- offset + cur < map->m_la + map->m_llen) {
- /* didn't get a valid collection previously (very rare) */
- if (!fe->cl)
- goto restart_now;
- goto hitted;
- }
-
- /* go ahead the next map_blocks */
- erofs_dbg("%s: [out-of-range] pos %llu", __func__, offset + cur);
-
- if (z_erofs_collector_end(fe))
- fe->backmost = false;
+ if (offset + cur < map->m_la ||
+ offset + cur >= map->m_la + map->m_llen) {
+ erofs_dbg("out-of-range map @ pos %llu", offset + cur);
- map->m_la = offset + cur;
- map->m_llen = 0;
- err = z_erofs_map_blocks_iter(inode, map, 0);
- if (err)
- goto err_out;
+ if (z_erofs_collector_end(fe))
+ fe->backmost = false;
+ map->m_la = offset + cur;
+ map->m_llen = 0;
+ err = z_erofs_map_blocks_iter(inode, map, 0);
+ if (err)
+ goto err_out;
+ } else {
+ if (fe->pcl)
+ goto hitted;
+ /* didn't get a valid pcluster previously (very rare) */
+ }
-restart_now:
if (!(map->m_flags & EROFS_MAP_MAPPED))
goto hitted;
@@ -766,7 +741,7 @@ retry:
/* bump up the number of spiltted parts of a page */
++spiltted;
/* also update nr_pages */
- fe->cl->nr_pages = max_t(pgoff_t, fe->cl->nr_pages, index + 1);
+ fe->pcl->nr_pages = max_t(pgoff_t, fe->pcl->nr_pages, index + 1);
next_part:
/* can be used for verification */
map->m_llen = offset + cur - map->m_la;
@@ -821,15 +796,13 @@ static int z_erofs_decompress_pcluster(struct super_block *sb,
enum z_erofs_page_type page_type;
bool overlapped, partial;
- struct z_erofs_collection *cl;
int err;
might_sleep();
- cl = z_erofs_primarycollection(pcl);
- DBG_BUGON(!READ_ONCE(cl->nr_pages));
+ DBG_BUGON(!READ_ONCE(pcl->nr_pages));
- mutex_lock(&cl->lock);
- nr_pages = cl->nr_pages;
+ mutex_lock(&pcl->lock);
+ nr_pages = pcl->nr_pages;
if (nr_pages <= Z_EROFS_VMAP_ONSTACK_PAGES) {
pages = pages_onstack;
@@ -857,9 +830,9 @@ static int z_erofs_decompress_pcluster(struct super_block *sb,
err = 0;
z_erofs_pagevec_ctor_init(&ctor, Z_EROFS_NR_INLINE_PAGEVECS,
- cl->pagevec, 0);
+ pcl->pagevec, 0);
- for (i = 0; i < cl->vcnt; ++i) {
+ for (i = 0; i < pcl->vcnt; ++i) {
unsigned int pagenr;
page = z_erofs_pagevec_dequeue(&ctor, &page_type);
@@ -945,11 +918,11 @@ static int z_erofs_decompress_pcluster(struct super_block *sb,
goto out;
llen = pcl->length >> Z_EROFS_PCLUSTER_LENGTH_BIT;
- if (nr_pages << PAGE_SHIFT >= cl->pageofs + llen) {
+ if (nr_pages << PAGE_SHIFT >= pcl->pageofs_out + llen) {
outputsize = llen;
partial = !(pcl->length & Z_EROFS_PCLUSTER_FULL_LENGTH);
} else {
- outputsize = (nr_pages << PAGE_SHIFT) - cl->pageofs;
+ outputsize = (nr_pages << PAGE_SHIFT) - pcl->pageofs_out;
partial = true;
}
@@ -963,7 +936,7 @@ static int z_erofs_decompress_pcluster(struct super_block *sb,
.in = compressed_pages,
.out = pages,
.pageofs_in = pcl->pageofs_in,
- .pageofs_out = cl->pageofs,
+ .pageofs_out = pcl->pageofs_out,
.inputsize = inputsize,
.outputsize = outputsize,
.alg = pcl->algorithmformat,
@@ -1012,16 +985,12 @@ out:
else if (pages != pages_onstack)
kvfree(pages);
- cl->nr_pages = 0;
- cl->vcnt = 0;
+ pcl->nr_pages = 0;
+ pcl->vcnt = 0;
- /* all cl locks MUST be taken before the following line */
+ /* pcluster lock MUST be taken before the following line */
WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_NIL);
-
- /* all cl locks SHOULD be released right now */
- mutex_unlock(&cl->lock);
-
- z_erofs_collection_put(cl);
+ mutex_unlock(&pcl->lock);
return err;
}
@@ -1043,6 +1012,7 @@ static void z_erofs_decompress_queue(const struct z_erofs_decompressqueue *io,
owned = READ_ONCE(pcl->next);
z_erofs_decompress_pcluster(io->sb, pcl, pagepool);
+ erofs_workgroup_put(&pcl->obj);
}
}
@@ -1466,22 +1436,19 @@ static void z_erofs_pcluster_readmore(struct z_erofs_decompress_frontend *f,
struct page *page;
page = erofs_grab_cache_page_nowait(inode->i_mapping, index);
- if (!page)
- goto skip;
-
- if (PageUptodate(page)) {
- unlock_page(page);
+ if (page) {
+ if (PageUptodate(page)) {
+ unlock_page(page);
+ } else {
+ err = z_erofs_do_read_page(f, page, pagepool);
+ if (err)
+ erofs_err(inode->i_sb,
+ "readmore error at page %lu @ nid %llu",
+ index, EROFS_I(inode)->nid);
+ }
put_page(page);
- goto skip;
}
- err = z_erofs_do_read_page(f, page, pagepool);
- if (err)
- erofs_err(inode->i_sb,
- "readmore error at page %lu @ nid %llu",
- index, EROFS_I(inode)->nid);
- put_page(page);
-skip:
if (cur < PAGE_SIZE)
break;
cur = (index << PAGE_SHIFT) - 1;