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author | 2022-06-01 11:54:29 -0700 | |
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committer | 2022-06-01 11:54:29 -0700 | |
commit | 8171acb8bc9b33f3ed827f0615b24f7a06495cd0 (patch) | |
tree | c8a78269ea6f58009664c76989e56a08d0c7e4fe /fs/erofs/zdata.c | |
parent | Merge tag '5.19-rc-ksmbd-server-fixes' of git://git.samba.org/ksmbd (diff) | |
parent | erofs: fix 'backmost' member of z_erofs_decompress_frontend (diff) | |
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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.c | 167 |
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; |