diff options
author | Gao Xiang <gaoxiang25@huawei.com> | 2018-09-19 13:49:07 +0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-20 12:25:36 +0200 |
commit | e5e3abbadf0dbd1068f64f8abe70401c5a178180 (patch) | |
tree | 94a07b627764fabd6795cd98c5a2725fd7f230e3 /drivers/staging/erofs | |
parent | staging: erofs: fold in `__update_workgrp_llen' (diff) | |
download | linux-dev-e5e3abbadf0dbd1068f64f8abe70401c5a178180.tar.xz linux-dev-e5e3abbadf0dbd1068f64f8abe70401c5a178180.zip |
staging: erofs: drop multiref support temporarily
Multiref support means that a compressed page could have
more than one reference, which is designed for on-disk data
deduplication. However, mkfs doesn't support this mode
at this moment, and the kernel implementation is also broken.
Let's drop multiref support. If it is fully implemented
in the future, it can be reverted later.
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/erofs')
-rw-r--r-- | drivers/staging/erofs/unzip_vle.c | 36 | ||||
-rw-r--r-- | drivers/staging/erofs/unzip_vle.h | 12 |
2 files changed, 6 insertions, 42 deletions
diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c index e820490f954a..9fe18cd34d4a 100644 --- a/drivers/staging/erofs/unzip_vle.c +++ b/drivers/staging/erofs/unzip_vle.c @@ -301,12 +301,9 @@ z_erofs_vle_work_lookup(const struct z_erofs_vle_work_finder *f) grp = container_of(egrp, struct z_erofs_vle_workgroup, obj); *f->grp_ret = grp; -#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF work = z_erofs_vle_grab_work(grp, f->pageofs); + /* if multiref is disabled, `primary' is always true */ primary = true; -#else - BUG(); -#endif DBG_BUGON(work->pageofs != f->pageofs); @@ -368,12 +365,9 @@ z_erofs_vle_work_register(const struct z_erofs_vle_work_finder *f, struct z_erofs_vle_workgroup *grp = *f->grp_ret; struct z_erofs_vle_work *work; -#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF + /* if multiref is disabled, grp should never be nullptr */ BUG_ON(grp != NULL); -#else - if (grp != NULL) - goto skip; -#endif + /* no available workgroup, let's allocate one */ grp = kmem_cache_zalloc(z_erofs_workgroup_cachep, GFP_NOFS); if (unlikely(grp == NULL)) @@ -396,13 +390,7 @@ z_erofs_vle_work_register(const struct z_erofs_vle_work_finder *f, *f->hosted = true; gnew = true; -#ifdef CONFIG_EROFS_FS_ZIP_MULTIREF -skip: - /* currently unimplemented */ - BUG(); -#else work = z_erofs_vle_grab_primary_work(grp); -#endif work->pageofs = f->pageofs; mutex_init(&work->lock); @@ -797,9 +785,7 @@ static int z_erofs_vle_unzip(struct super_block *sb, struct z_erofs_pagevec_ctor ctor; unsigned int nr_pages; -#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF unsigned int sparsemem_pages = 0; -#endif struct page *pages_onstack[Z_EROFS_VLE_VMAP_ONSTACK_PAGES]; struct page **pages, **compressed_pages, *page; unsigned int i, llen; @@ -811,11 +797,7 @@ static int z_erofs_vle_unzip(struct super_block *sb, int err; might_sleep(); -#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF work = z_erofs_vle_grab_primary_work(grp); -#else - BUG(); -#endif BUG_ON(!READ_ONCE(work->nr_pages)); mutex_lock(&work->lock); @@ -866,13 +848,11 @@ repeat: pagenr = z_erofs_onlinepage_index(page); BUG_ON(pagenr >= nr_pages); - -#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF BUG_ON(pages[pagenr] != NULL); - ++sparsemem_pages; -#endif + pages[pagenr] = page; } + sparsemem_pages = i; z_erofs_pagevec_ctor_exit(&ctor, true); @@ -902,10 +882,8 @@ repeat: pagenr = z_erofs_onlinepage_index(page); BUG_ON(pagenr >= nr_pages); -#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF BUG_ON(pages[pagenr] != NULL); ++sparsemem_pages; -#endif pages[pagenr] = page; overlapped = true; @@ -931,12 +909,10 @@ repeat: if (err != -ENOTSUPP) goto out_percpu; -#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF if (sparsemem_pages >= nr_pages) { BUG_ON(sparsemem_pages > nr_pages); goto skip_allocpage; } -#endif for (i = 0; i < nr_pages; ++i) { if (pages[i] != NULL) @@ -945,9 +921,7 @@ repeat: pages[i] = __stagingpage_alloc(page_pool, GFP_NOFS); } -#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF skip_allocpage: -#endif vout = erofs_vmap(pages, nr_pages); err = z_erofs_vle_unzip_vmap(compressed_pages, diff --git a/drivers/staging/erofs/unzip_vle.h b/drivers/staging/erofs/unzip_vle.h index 393998500865..3316bc36965d 100644 --- a/drivers/staging/erofs/unzip_vle.h +++ b/drivers/staging/erofs/unzip_vle.h @@ -47,13 +47,6 @@ static inline bool z_erofs_gather_if_stagingpage(struct list_head *page_pool, #define Z_EROFS_VLE_INLINE_PAGEVECS 3 struct z_erofs_vle_work { - /* struct z_erofs_vle_work *left, *right; */ - -#ifdef CONFIG_EROFS_FS_ZIP_MULTIREF - struct list_head list; - - atomic_t refcount; -#endif struct mutex lock; /* I: decompression offset in page */ @@ -107,10 +100,8 @@ static inline void z_erofs_vle_set_workgrp_fmt( grp->flags = fmt | (grp->flags & ~Z_EROFS_VLE_WORKGRP_FMT_MASK); } -#ifdef CONFIG_EROFS_FS_ZIP_MULTIREF -#error multiref decompression is unimplemented yet -#else +/* definitions if multiref is disabled */ #define z_erofs_vle_grab_primary_work(grp) (&(grp)->work) #define z_erofs_vle_grab_work(grp, pageofs) (&(grp)->work) #define z_erofs_vle_work_workgroup(wrk, primary) \ @@ -118,7 +109,6 @@ static inline void z_erofs_vle_set_workgrp_fmt( struct z_erofs_vle_workgroup, work) : \ ({ BUG(); (void *)NULL; })) -#endif #define Z_EROFS_WORKGROUP_SIZE sizeof(struct z_erofs_vle_workgroup) |