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1470 lines
38 KiB
1470 lines
38 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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* Copyright (C) 2018 HUAWEI, Inc. |
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* https://www.huawei.com/ |
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*/ |
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#include "zdata.h" |
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#include "compress.h" |
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#include <linux/prefetch.h> |
|
|
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#include <trace/events/erofs.h> |
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|
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/* |
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* since pclustersize is variable for big pcluster feature, introduce slab |
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* pools implementation for different pcluster sizes. |
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*/ |
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struct z_erofs_pcluster_slab { |
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struct kmem_cache *slab; |
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unsigned int maxpages; |
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char name[48]; |
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}; |
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|
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#define _PCLP(n) { .maxpages = n } |
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|
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static struct z_erofs_pcluster_slab pcluster_pool[] __read_mostly = { |
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_PCLP(1), _PCLP(4), _PCLP(16), _PCLP(64), _PCLP(128), |
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_PCLP(Z_EROFS_PCLUSTER_MAX_PAGES) |
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}; |
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|
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static void z_erofs_destroy_pcluster_pool(void) |
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{ |
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int i; |
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|
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for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) { |
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if (!pcluster_pool[i].slab) |
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continue; |
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kmem_cache_destroy(pcluster_pool[i].slab); |
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pcluster_pool[i].slab = NULL; |
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} |
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} |
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|
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static int z_erofs_create_pcluster_pool(void) |
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{ |
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struct z_erofs_pcluster_slab *pcs; |
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struct z_erofs_pcluster *a; |
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unsigned int size; |
|
|
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for (pcs = pcluster_pool; |
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pcs < pcluster_pool + ARRAY_SIZE(pcluster_pool); ++pcs) { |
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size = struct_size(a, compressed_pages, pcs->maxpages); |
|
|
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sprintf(pcs->name, "erofs_pcluster-%u", pcs->maxpages); |
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pcs->slab = kmem_cache_create(pcs->name, size, 0, |
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SLAB_RECLAIM_ACCOUNT, NULL); |
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if (pcs->slab) |
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continue; |
|
|
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z_erofs_destroy_pcluster_pool(); |
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return -ENOMEM; |
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} |
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return 0; |
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} |
|
|
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static struct z_erofs_pcluster *z_erofs_alloc_pcluster(unsigned int nrpages) |
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{ |
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int i; |
|
|
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for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) { |
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struct z_erofs_pcluster_slab *pcs = pcluster_pool + i; |
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struct z_erofs_pcluster *pcl; |
|
|
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if (nrpages > pcs->maxpages) |
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continue; |
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|
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pcl = kmem_cache_zalloc(pcs->slab, GFP_NOFS); |
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if (!pcl) |
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return ERR_PTR(-ENOMEM); |
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pcl->pclusterpages = nrpages; |
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return pcl; |
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} |
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return ERR_PTR(-EINVAL); |
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} |
|
|
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static void z_erofs_free_pcluster(struct z_erofs_pcluster *pcl) |
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{ |
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int i; |
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|
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for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) { |
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struct z_erofs_pcluster_slab *pcs = pcluster_pool + i; |
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|
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if (pcl->pclusterpages > pcs->maxpages) |
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continue; |
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|
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kmem_cache_free(pcs->slab, pcl); |
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return; |
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} |
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DBG_BUGON(1); |
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} |
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|
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/* |
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* a compressed_pages[] placeholder in order to avoid |
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* being filled with file pages for in-place decompression. |
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*/ |
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#define PAGE_UNALLOCATED ((void *)0x5F0E4B1D) |
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|
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/* how to allocate cached pages for a pcluster */ |
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enum z_erofs_cache_alloctype { |
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DONTALLOC, /* don't allocate any cached pages */ |
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DELAYEDALLOC, /* delayed allocation (at the time of submitting io) */ |
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/* |
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* try to use cached I/O if page allocation succeeds or fallback |
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* to in-place I/O instead to avoid any direct reclaim. |
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*/ |
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TRYALLOC, |
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}; |
|
|
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/* |
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* tagged pointer with 1-bit tag for all compressed pages |
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* tag 0 - the page is just found with an extra page reference |
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*/ |
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typedef tagptr1_t compressed_page_t; |
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|
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#define tag_compressed_page_justfound(page) \ |
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tagptr_fold(compressed_page_t, page, 1) |
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|
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static struct workqueue_struct *z_erofs_workqueue __read_mostly; |
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|
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void z_erofs_exit_zip_subsystem(void) |
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{ |
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destroy_workqueue(z_erofs_workqueue); |
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z_erofs_destroy_pcluster_pool(); |
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} |
|
|
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static inline int z_erofs_init_workqueue(void) |
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{ |
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const unsigned int onlinecpus = num_possible_cpus(); |
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|
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/* |
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* no need to spawn too many threads, limiting threads could minimum |
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* scheduling overhead, perhaps per-CPU threads should be better? |
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*/ |
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z_erofs_workqueue = alloc_workqueue("erofs_unzipd", |
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WQ_UNBOUND | WQ_HIGHPRI, |
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onlinecpus + onlinecpus / 4); |
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return z_erofs_workqueue ? 0 : -ENOMEM; |
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} |
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|
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int __init z_erofs_init_zip_subsystem(void) |
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{ |
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int err = z_erofs_create_pcluster_pool(); |
|
|
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if (err) |
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return err; |
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err = z_erofs_init_workqueue(); |
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if (err) |
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z_erofs_destroy_pcluster_pool(); |
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return err; |
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} |
|
|
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enum z_erofs_collectmode { |
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COLLECT_SECONDARY, |
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COLLECT_PRIMARY, |
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/* |
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* The current collection was the tail of an exist chain, in addition |
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* that the previous processed chained collections are all decided to |
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* be hooked up to it. |
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* A new chain will be created for the remaining collections which are |
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* not processed yet, therefore different from COLLECT_PRIMARY_FOLLOWED, |
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* the next collection cannot reuse the whole page safely in |
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* the following scenario: |
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* ________________________________________________________________ |
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* | tail (partial) page | head (partial) page | |
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* | (belongs to the next cl) | (belongs to the current cl) | |
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* |_______PRIMARY_FOLLOWED_______|________PRIMARY_HOOKED___________| |
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*/ |
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COLLECT_PRIMARY_HOOKED, |
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/* |
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* a weak form of COLLECT_PRIMARY_FOLLOWED, the difference is that it |
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* could be dispatched into bypass queue later due to uptodated managed |
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* pages. All related online pages cannot be reused for inplace I/O (or |
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* pagevec) since it can be directly decoded without I/O submission. |
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*/ |
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COLLECT_PRIMARY_FOLLOWED_NOINPLACE, |
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/* |
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* The current collection has been linked with the owned chain, and |
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* could also be linked with the remaining collections, which means |
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* if the processing page is the tail page of the collection, thus |
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* the current collection can safely use the whole page (since |
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* the previous collection is under control) for in-place I/O, as |
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* illustrated below: |
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* ________________________________________________________________ |
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* | tail (partial) page | head (partial) page | |
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* | (of the current cl) | (of the previous collection) | |
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* | PRIMARY_FOLLOWED or | | |
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* |_____PRIMARY_HOOKED___|____________PRIMARY_FOLLOWED____________| |
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* |
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* [ (*) the above page can be used as inplace I/O. ] |
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*/ |
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COLLECT_PRIMARY_FOLLOWED, |
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}; |
|
|
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struct z_erofs_collector { |
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struct z_erofs_pagevec_ctor vector; |
|
|
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struct z_erofs_pcluster *pcl, *tailpcl; |
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struct z_erofs_collection *cl; |
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/* a pointer used to pick up inplace I/O pages */ |
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struct page **icpage_ptr; |
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z_erofs_next_pcluster_t owned_head; |
|
|
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enum z_erofs_collectmode mode; |
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}; |
|
|
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struct z_erofs_decompress_frontend { |
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struct inode *const inode; |
|
|
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struct z_erofs_collector clt; |
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struct erofs_map_blocks map; |
|
|
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bool readahead; |
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/* used for applying cache strategy on the fly */ |
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bool backmost; |
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erofs_off_t headoffset; |
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}; |
|
|
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#define COLLECTOR_INIT() { \ |
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.owned_head = Z_EROFS_PCLUSTER_TAIL, \ |
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.mode = COLLECT_PRIMARY_FOLLOWED } |
|
|
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#define DECOMPRESS_FRONTEND_INIT(__i) { \ |
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.inode = __i, .clt = COLLECTOR_INIT(), \ |
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.backmost = true, } |
|
|
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static struct page *z_pagemap_global[Z_EROFS_VMAP_GLOBAL_PAGES]; |
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static DEFINE_MUTEX(z_pagemap_global_lock); |
|
|
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static void preload_compressed_pages(struct z_erofs_collector *clt, |
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struct address_space *mc, |
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enum z_erofs_cache_alloctype type, |
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struct list_head *pagepool) |
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{ |
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struct z_erofs_pcluster *pcl = clt->pcl; |
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bool standalone = true; |
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gfp_t gfp = (mapping_gfp_mask(mc) & ~__GFP_DIRECT_RECLAIM) | |
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__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN; |
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struct page **pages; |
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pgoff_t index; |
|
|
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if (clt->mode < COLLECT_PRIMARY_FOLLOWED) |
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return; |
|
|
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pages = pcl->compressed_pages; |
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index = pcl->obj.index; |
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for (; index < pcl->obj.index + pcl->pclusterpages; ++index, ++pages) { |
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struct page *page; |
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compressed_page_t t; |
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struct page *newpage = NULL; |
|
|
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/* the compressed page was loaded before */ |
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if (READ_ONCE(*pages)) |
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continue; |
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|
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page = find_get_page(mc, index); |
|
|
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if (page) { |
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t = tag_compressed_page_justfound(page); |
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} else { |
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/* I/O is needed, no possible to decompress directly */ |
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standalone = false; |
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switch (type) { |
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case DELAYEDALLOC: |
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t = tagptr_init(compressed_page_t, |
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PAGE_UNALLOCATED); |
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break; |
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case TRYALLOC: |
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newpage = erofs_allocpage(pagepool, gfp); |
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if (!newpage) |
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continue; |
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set_page_private(newpage, |
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Z_EROFS_PREALLOCATED_PAGE); |
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t = tag_compressed_page_justfound(newpage); |
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break; |
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default: /* DONTALLOC */ |
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continue; |
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} |
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} |
|
|
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if (!cmpxchg_relaxed(pages, NULL, tagptr_cast_ptr(t))) |
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continue; |
|
|
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if (page) { |
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put_page(page); |
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} else if (newpage) { |
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set_page_private(newpage, 0); |
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list_add(&newpage->lru, pagepool); |
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} |
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} |
|
|
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/* |
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* don't do inplace I/O if all compressed pages are available in |
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* managed cache since it can be moved to the bypass queue instead. |
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*/ |
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if (standalone) |
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clt->mode = COLLECT_PRIMARY_FOLLOWED_NOINPLACE; |
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} |
|
|
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/* called by erofs_shrinker to get rid of all compressed_pages */ |
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int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, |
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struct erofs_workgroup *grp) |
|
{ |
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struct z_erofs_pcluster *const pcl = |
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container_of(grp, struct z_erofs_pcluster, obj); |
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struct address_space *const mapping = MNGD_MAPPING(sbi); |
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int i; |
|
|
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/* |
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* refcount of workgroup is now freezed as 1, |
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* therefore no need to worry about available decompression users. |
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*/ |
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for (i = 0; i < pcl->pclusterpages; ++i) { |
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struct page *page = pcl->compressed_pages[i]; |
|
|
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if (!page) |
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continue; |
|
|
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/* block other users from reclaiming or migrating the page */ |
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if (!trylock_page(page)) |
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return -EBUSY; |
|
|
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if (page->mapping != mapping) |
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continue; |
|
|
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/* barrier is implied in the following 'unlock_page' */ |
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WRITE_ONCE(pcl->compressed_pages[i], NULL); |
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detach_page_private(page); |
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unlock_page(page); |
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} |
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return 0; |
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} |
|
|
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int erofs_try_to_free_cached_page(struct address_space *mapping, |
|
struct page *page) |
|
{ |
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struct z_erofs_pcluster *const pcl = (void *)page_private(page); |
|
int ret = 0; /* 0 - busy */ |
|
|
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if (erofs_workgroup_try_to_freeze(&pcl->obj, 1)) { |
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unsigned int i; |
|
|
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for (i = 0; i < pcl->pclusterpages; ++i) { |
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if (pcl->compressed_pages[i] == page) { |
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WRITE_ONCE(pcl->compressed_pages[i], NULL); |
|
ret = 1; |
|
break; |
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} |
|
} |
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erofs_workgroup_unfreeze(&pcl->obj, 1); |
|
|
|
if (ret) |
|
detach_page_private(page); |
|
} |
|
return ret; |
|
} |
|
|
|
/* page_type must be Z_EROFS_PAGE_TYPE_EXCLUSIVE */ |
|
static bool z_erofs_try_inplace_io(struct z_erofs_collector *clt, |
|
struct page *page) |
|
{ |
|
struct z_erofs_pcluster *const pcl = clt->pcl; |
|
|
|
while (clt->icpage_ptr > pcl->compressed_pages) |
|
if (!cmpxchg(--clt->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, |
|
struct page *page, |
|
enum z_erofs_page_type type) |
|
{ |
|
int ret; |
|
|
|
/* give priority for inplaceio */ |
|
if (clt->mode >= COLLECT_PRIMARY && |
|
type == Z_EROFS_PAGE_TYPE_EXCLUSIVE && |
|
z_erofs_try_inplace_io(clt, page)) |
|
return 0; |
|
|
|
ret = z_erofs_pagevec_enqueue(&clt->vector, page, type); |
|
clt->cl->vcnt += (unsigned int)ret; |
|
|
|
return ret ? 0 : -EAGAIN; |
|
} |
|
|
|
static void z_erofs_try_to_claim_pcluster(struct z_erofs_collector *clt) |
|
{ |
|
struct z_erofs_pcluster *pcl = clt->pcl; |
|
z_erofs_next_pcluster_t *owned_head = &clt->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; |
|
return; |
|
} |
|
|
|
/* |
|
* type 2, link to the end of an existing open chain, be careful |
|
* that its submission is controlled by the original attached chain. |
|
*/ |
|
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; |
|
return; |
|
} |
|
/* type 3, it belongs to a chain, but it isn't the end of the chain */ |
|
clt->mode = COLLECT_PRIMARY; |
|
} |
|
|
|
static int z_erofs_lookup_collection(struct z_erofs_collector *clt, |
|
struct inode *inode, |
|
struct erofs_map_blocks *map) |
|
{ |
|
struct z_erofs_pcluster *pcl = clt->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) { |
|
DBG_BUGON(1); |
|
return -EFSCORRUPTED; |
|
} |
|
|
|
cl = z_erofs_primarycollection(pcl); |
|
if (cl->pageofs != (map->m_la & ~PAGE_MASK)) { |
|
DBG_BUGON(1); |
|
return -EFSCORRUPTED; |
|
} |
|
|
|
length = READ_ONCE(pcl->length); |
|
if (length & Z_EROFS_PCLUSTER_FULL_LENGTH) { |
|
if ((map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) > length) { |
|
DBG_BUGON(1); |
|
return -EFSCORRUPTED; |
|
} |
|
} else { |
|
unsigned int llen = map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT; |
|
|
|
if (map->m_flags & EROFS_MAP_FULL_MAPPED) |
|
llen |= Z_EROFS_PCLUSTER_FULL_LENGTH; |
|
|
|
while (llen > length && |
|
length != cmpxchg_relaxed(&pcl->length, length, llen)) { |
|
cpu_relax(); |
|
length = READ_ONCE(pcl->length); |
|
} |
|
} |
|
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; |
|
|
|
z_erofs_try_to_claim_pcluster(clt); |
|
clt->cl = cl; |
|
return 0; |
|
} |
|
|
|
static int z_erofs_register_collection(struct z_erofs_collector *clt, |
|
struct inode *inode, |
|
struct erofs_map_blocks *map) |
|
{ |
|
struct z_erofs_pcluster *pcl; |
|
struct z_erofs_collection *cl; |
|
struct erofs_workgroup *grp; |
|
int err; |
|
|
|
/* no available pcluster, let's allocate one */ |
|
pcl = z_erofs_alloc_pcluster(map->m_plen >> PAGE_SHIFT); |
|
if (IS_ERR(pcl)) |
|
return PTR_ERR(pcl); |
|
|
|
atomic_set(&pcl->obj.refcount, 1); |
|
pcl->obj.index = map->m_pa >> PAGE_SHIFT; |
|
|
|
pcl->length = (map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) | |
|
(map->m_flags & EROFS_MAP_FULL_MAPPED ? |
|
Z_EROFS_PCLUSTER_FULL_LENGTH : 0); |
|
|
|
if (map->m_flags & EROFS_MAP_ZIPPED) |
|
pcl->algorithmformat = Z_EROFS_COMPRESSION_LZ4; |
|
else |
|
pcl->algorithmformat = Z_EROFS_COMPRESSION_SHIFTED; |
|
|
|
/* new pclusters should be claimed as type 1, primary and followed */ |
|
pcl->next = clt->owned_head; |
|
clt->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)); |
|
|
|
grp = erofs_insert_workgroup(inode->i_sb, &pcl->obj); |
|
if (IS_ERR(grp)) { |
|
err = PTR_ERR(grp); |
|
goto err_out; |
|
} |
|
|
|
if (grp != &pcl->obj) { |
|
clt->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; |
|
return 0; |
|
|
|
err_out: |
|
mutex_unlock(&cl->lock); |
|
z_erofs_free_pcluster(pcl); |
|
return err; |
|
} |
|
|
|
static int z_erofs_collector_begin(struct z_erofs_collector *clt, |
|
struct inode *inode, |
|
struct erofs_map_blocks *map) |
|
{ |
|
struct erofs_workgroup *grp; |
|
int ret; |
|
|
|
DBG_BUGON(clt->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); |
|
|
|
if (!PAGE_ALIGNED(map->m_pa)) { |
|
DBG_BUGON(1); |
|
return -EINVAL; |
|
} |
|
|
|
grp = erofs_find_workgroup(inode->i_sb, map->m_pa >> PAGE_SHIFT); |
|
if (grp) { |
|
clt->pcl = container_of(grp, struct z_erofs_pcluster, obj); |
|
} else { |
|
ret = z_erofs_register_collection(clt, inode, map); |
|
|
|
if (!ret) |
|
goto out; |
|
if (ret != -EEXIST) |
|
return ret; |
|
} |
|
|
|
ret = z_erofs_lookup_collection(clt, inode, map); |
|
if (ret) { |
|
erofs_workgroup_put(&clt->pcl->obj); |
|
return ret; |
|
} |
|
|
|
out: |
|
z_erofs_pagevec_ctor_init(&clt->vector, Z_EROFS_NR_INLINE_PAGEVECS, |
|
clt->cl->pagevec, clt->cl->vcnt); |
|
|
|
/* since file-backed online pages are traversed in reverse order */ |
|
clt->icpage_ptr = clt->pcl->compressed_pages + clt->pcl->pclusterpages; |
|
return 0; |
|
} |
|
|
|
/* |
|
* keep in mind that no referenced pclusters will be freed |
|
* only after a RCU grace period. |
|
*/ |
|
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)); |
|
} |
|
|
|
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); |
|
} |
|
|
|
static bool z_erofs_collector_end(struct z_erofs_collector *clt) |
|
{ |
|
struct z_erofs_collection *cl = clt->cl; |
|
|
|
if (!cl) |
|
return false; |
|
|
|
z_erofs_pagevec_ctor_exit(&clt->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) |
|
z_erofs_collection_put(cl); |
|
|
|
clt->cl = NULL; |
|
return true; |
|
} |
|
|
|
static bool should_alloc_managed_pages(struct z_erofs_decompress_frontend *fe, |
|
unsigned int cachestrategy, |
|
erofs_off_t la) |
|
{ |
|
if (cachestrategy <= EROFS_ZIP_CACHE_DISABLED) |
|
return false; |
|
|
|
if (fe->backmost) |
|
return true; |
|
|
|
return cachestrategy >= EROFS_ZIP_CACHE_READAROUND && |
|
la < fe->headoffset; |
|
} |
|
|
|
static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe, |
|
struct page *page, struct list_head *pagepool) |
|
{ |
|
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; |
|
|
|
enum z_erofs_cache_alloctype cache_strategy; |
|
enum z_erofs_page_type page_type; |
|
unsigned int cur, end, spiltted, index; |
|
int err = 0; |
|
|
|
/* register locked file pages as online pages in pack */ |
|
z_erofs_onlinepage_init(page); |
|
|
|
spiltted = 0; |
|
end = PAGE_SIZE; |
|
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 (!clt->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(clt)) |
|
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; |
|
|
|
restart_now: |
|
if (!(map->m_flags & EROFS_MAP_MAPPED)) |
|
goto hitted; |
|
|
|
err = z_erofs_collector_begin(clt, inode, map); |
|
if (err) |
|
goto err_out; |
|
|
|
/* preload all compressed pages (maybe downgrade role if necessary) */ |
|
if (should_alloc_managed_pages(fe, sbi->ctx.cache_strategy, map->m_la)) |
|
cache_strategy = TRYALLOC; |
|
else |
|
cache_strategy = DONTALLOC; |
|
|
|
preload_compressed_pages(clt, MNGD_MAPPING(sbi), |
|
cache_strategy, pagepool); |
|
|
|
hitted: |
|
/* |
|
* Ensure the current partial page belongs to this submit chain rather |
|
* than other concurrent submit chains or the noio(bypass) chain since |
|
* 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); |
|
|
|
cur = end - min_t(unsigned int, offset + end - map->m_la, end); |
|
if (!(map->m_flags & EROFS_MAP_MAPPED)) { |
|
zero_user_segment(page, cur, end); |
|
goto next_part; |
|
} |
|
|
|
/* let's derive page type */ |
|
page_type = cur ? Z_EROFS_VLE_PAGE_TYPE_HEAD : |
|
(!spiltted ? Z_EROFS_PAGE_TYPE_EXCLUSIVE : |
|
(tight ? Z_EROFS_PAGE_TYPE_EXCLUSIVE : |
|
Z_EROFS_VLE_PAGE_TYPE_TAIL_SHARED)); |
|
|
|
if (cur) |
|
tight &= (clt->mode >= COLLECT_PRIMARY_FOLLOWED); |
|
|
|
retry: |
|
err = z_erofs_attach_page(clt, page, page_type); |
|
/* 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, |
|
Z_EROFS_PAGE_TYPE_EXCLUSIVE); |
|
if (!err) |
|
goto retry; |
|
} |
|
|
|
if (err) |
|
goto err_out; |
|
|
|
index = page->index - (map->m_la >> PAGE_SHIFT); |
|
|
|
z_erofs_onlinepage_fixup(page, index, true); |
|
|
|
/* 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); |
|
next_part: |
|
/* can be used for verification */ |
|
map->m_llen = offset + cur - map->m_la; |
|
|
|
end = cur; |
|
if (end > 0) |
|
goto repeat; |
|
|
|
out: |
|
z_erofs_onlinepage_endio(page); |
|
|
|
erofs_dbg("%s, finish page: %pK spiltted: %u map->m_llen %llu", |
|
__func__, page, spiltted, map->m_llen); |
|
return err; |
|
|
|
/* if some error occurred while processing this page */ |
|
err_out: |
|
SetPageError(page); |
|
goto out; |
|
} |
|
|
|
static void z_erofs_decompressqueue_work(struct work_struct *work); |
|
static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io, |
|
bool sync, int bios) |
|
{ |
|
struct erofs_sb_info *const sbi = EROFS_SB(io->sb); |
|
|
|
/* wake up the caller thread for sync decompression */ |
|
if (sync) { |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&io->u.wait.lock, flags); |
|
if (!atomic_add_return(bios, &io->pending_bios)) |
|
wake_up_locked(&io->u.wait); |
|
spin_unlock_irqrestore(&io->u.wait.lock, flags); |
|
return; |
|
} |
|
|
|
if (atomic_add_return(bios, &io->pending_bios)) |
|
return; |
|
/* Use workqueue and sync decompression for atomic contexts only */ |
|
if (in_atomic() || irqs_disabled()) { |
|
queue_work(z_erofs_workqueue, &io->u.work); |
|
sbi->ctx.readahead_sync_decompress = true; |
|
return; |
|
} |
|
z_erofs_decompressqueue_work(&io->u.work); |
|
} |
|
|
|
static bool z_erofs_page_is_invalidated(struct page *page) |
|
{ |
|
return !page->mapping && !z_erofs_is_shortlived_page(page); |
|
} |
|
|
|
static void z_erofs_decompressqueue_endio(struct bio *bio) |
|
{ |
|
tagptr1_t t = tagptr_init(tagptr1_t, bio->bi_private); |
|
struct z_erofs_decompressqueue *q = tagptr_unfold_ptr(t); |
|
blk_status_t err = bio->bi_status; |
|
struct bio_vec *bvec; |
|
struct bvec_iter_all iter_all; |
|
|
|
bio_for_each_segment_all(bvec, bio, iter_all) { |
|
struct page *page = bvec->bv_page; |
|
|
|
DBG_BUGON(PageUptodate(page)); |
|
DBG_BUGON(z_erofs_page_is_invalidated(page)); |
|
|
|
if (err) |
|
SetPageError(page); |
|
|
|
if (erofs_page_is_managed(EROFS_SB(q->sb), page)) { |
|
if (!err) |
|
SetPageUptodate(page); |
|
unlock_page(page); |
|
} |
|
} |
|
z_erofs_decompress_kickoff(q, tagptr_unfold_tags(t), -1); |
|
bio_put(bio); |
|
} |
|
|
|
static int z_erofs_decompress_pcluster(struct super_block *sb, |
|
struct z_erofs_pcluster *pcl, |
|
struct list_head *pagepool) |
|
{ |
|
struct erofs_sb_info *const sbi = EROFS_SB(sb); |
|
struct z_erofs_pagevec_ctor ctor; |
|
unsigned int i, inputsize, outputsize, llen, nr_pages; |
|
struct page *pages_onstack[Z_EROFS_VMAP_ONSTACK_PAGES]; |
|
struct page **pages, **compressed_pages, *page; |
|
|
|
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)); |
|
|
|
mutex_lock(&cl->lock); |
|
nr_pages = cl->nr_pages; |
|
|
|
if (nr_pages <= Z_EROFS_VMAP_ONSTACK_PAGES) { |
|
pages = pages_onstack; |
|
} else if (nr_pages <= Z_EROFS_VMAP_GLOBAL_PAGES && |
|
mutex_trylock(&z_pagemap_global_lock)) { |
|
pages = z_pagemap_global; |
|
} else { |
|
gfp_t gfp_flags = GFP_KERNEL; |
|
|
|
if (nr_pages > Z_EROFS_VMAP_GLOBAL_PAGES) |
|
gfp_flags |= __GFP_NOFAIL; |
|
|
|
pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
|
gfp_flags); |
|
|
|
/* fallback to global pagemap for the lowmem scenario */ |
|
if (!pages) { |
|
mutex_lock(&z_pagemap_global_lock); |
|
pages = z_pagemap_global; |
|
} |
|
} |
|
|
|
for (i = 0; i < nr_pages; ++i) |
|
pages[i] = NULL; |
|
|
|
err = 0; |
|
z_erofs_pagevec_ctor_init(&ctor, Z_EROFS_NR_INLINE_PAGEVECS, |
|
cl->pagevec, 0); |
|
|
|
for (i = 0; i < cl->vcnt; ++i) { |
|
unsigned int pagenr; |
|
|
|
page = z_erofs_pagevec_dequeue(&ctor, &page_type); |
|
|
|
/* all pages in pagevec ought to be valid */ |
|
DBG_BUGON(!page); |
|
DBG_BUGON(z_erofs_page_is_invalidated(page)); |
|
|
|
if (z_erofs_put_shortlivedpage(pagepool, page)) |
|
continue; |
|
|
|
if (page_type == Z_EROFS_VLE_PAGE_TYPE_HEAD) |
|
pagenr = 0; |
|
else |
|
pagenr = z_erofs_onlinepage_index(page); |
|
|
|
DBG_BUGON(pagenr >= nr_pages); |
|
|
|
/* |
|
* currently EROFS doesn't support multiref(dedup), |
|
* so here erroring out one multiref page. |
|
*/ |
|
if (pages[pagenr]) { |
|
DBG_BUGON(1); |
|
SetPageError(pages[pagenr]); |
|
z_erofs_onlinepage_endio(pages[pagenr]); |
|
err = -EFSCORRUPTED; |
|
} |
|
pages[pagenr] = page; |
|
} |
|
z_erofs_pagevec_ctor_exit(&ctor, true); |
|
|
|
overlapped = false; |
|
compressed_pages = pcl->compressed_pages; |
|
|
|
for (i = 0; i < pcl->pclusterpages; ++i) { |
|
unsigned int pagenr; |
|
|
|
page = compressed_pages[i]; |
|
|
|
/* all compressed pages ought to be valid */ |
|
DBG_BUGON(!page); |
|
DBG_BUGON(z_erofs_page_is_invalidated(page)); |
|
|
|
if (!z_erofs_is_shortlived_page(page)) { |
|
if (erofs_page_is_managed(sbi, page)) { |
|
if (!PageUptodate(page)) |
|
err = -EIO; |
|
continue; |
|
} |
|
|
|
/* |
|
* only if non-head page can be selected |
|
* for inplace decompression |
|
*/ |
|
pagenr = z_erofs_onlinepage_index(page); |
|
|
|
DBG_BUGON(pagenr >= nr_pages); |
|
if (pages[pagenr]) { |
|
DBG_BUGON(1); |
|
SetPageError(pages[pagenr]); |
|
z_erofs_onlinepage_endio(pages[pagenr]); |
|
err = -EFSCORRUPTED; |
|
} |
|
pages[pagenr] = page; |
|
|
|
overlapped = true; |
|
} |
|
|
|
/* PG_error needs checking for all non-managed pages */ |
|
if (PageError(page)) { |
|
DBG_BUGON(PageUptodate(page)); |
|
err = -EIO; |
|
} |
|
} |
|
|
|
if (err) |
|
goto out; |
|
|
|
llen = pcl->length >> Z_EROFS_PCLUSTER_LENGTH_BIT; |
|
if (nr_pages << PAGE_SHIFT >= cl->pageofs + llen) { |
|
outputsize = llen; |
|
partial = !(pcl->length & Z_EROFS_PCLUSTER_FULL_LENGTH); |
|
} else { |
|
outputsize = (nr_pages << PAGE_SHIFT) - cl->pageofs; |
|
partial = true; |
|
} |
|
|
|
inputsize = pcl->pclusterpages * PAGE_SIZE; |
|
err = z_erofs_decompress(&(struct z_erofs_decompress_req) { |
|
.sb = sb, |
|
.in = compressed_pages, |
|
.out = pages, |
|
.pageofs_out = cl->pageofs, |
|
.inputsize = inputsize, |
|
.outputsize = outputsize, |
|
.alg = pcl->algorithmformat, |
|
.inplace_io = overlapped, |
|
.partial_decoding = partial |
|
}, pagepool); |
|
|
|
out: |
|
/* must handle all compressed pages before ending pages */ |
|
for (i = 0; i < pcl->pclusterpages; ++i) { |
|
page = compressed_pages[i]; |
|
|
|
if (erofs_page_is_managed(sbi, page)) |
|
continue; |
|
|
|
/* recycle all individual short-lived pages */ |
|
(void)z_erofs_put_shortlivedpage(pagepool, page); |
|
|
|
WRITE_ONCE(compressed_pages[i], NULL); |
|
} |
|
|
|
for (i = 0; i < nr_pages; ++i) { |
|
page = pages[i]; |
|
if (!page) |
|
continue; |
|
|
|
DBG_BUGON(z_erofs_page_is_invalidated(page)); |
|
|
|
/* recycle all individual short-lived pages */ |
|
if (z_erofs_put_shortlivedpage(pagepool, page)) |
|
continue; |
|
|
|
if (err < 0) |
|
SetPageError(page); |
|
|
|
z_erofs_onlinepage_endio(page); |
|
} |
|
|
|
if (pages == z_pagemap_global) |
|
mutex_unlock(&z_pagemap_global_lock); |
|
else if (pages != pages_onstack) |
|
kvfree(pages); |
|
|
|
cl->nr_pages = 0; |
|
cl->vcnt = 0; |
|
|
|
/* all cl locks 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); |
|
return err; |
|
} |
|
|
|
static void z_erofs_decompress_queue(const struct z_erofs_decompressqueue *io, |
|
struct list_head *pagepool) |
|
{ |
|
z_erofs_next_pcluster_t owned = io->head; |
|
|
|
while (owned != Z_EROFS_PCLUSTER_TAIL_CLOSED) { |
|
struct z_erofs_pcluster *pcl; |
|
|
|
/* no possible that 'owned' equals Z_EROFS_WORK_TPTR_TAIL */ |
|
DBG_BUGON(owned == Z_EROFS_PCLUSTER_TAIL); |
|
|
|
/* no possible that 'owned' equals NULL */ |
|
DBG_BUGON(owned == Z_EROFS_PCLUSTER_NIL); |
|
|
|
pcl = container_of(owned, struct z_erofs_pcluster, next); |
|
owned = READ_ONCE(pcl->next); |
|
|
|
z_erofs_decompress_pcluster(io->sb, pcl, pagepool); |
|
} |
|
} |
|
|
|
static void z_erofs_decompressqueue_work(struct work_struct *work) |
|
{ |
|
struct z_erofs_decompressqueue *bgq = |
|
container_of(work, struct z_erofs_decompressqueue, u.work); |
|
LIST_HEAD(pagepool); |
|
|
|
DBG_BUGON(bgq->head == Z_EROFS_PCLUSTER_TAIL_CLOSED); |
|
z_erofs_decompress_queue(bgq, &pagepool); |
|
|
|
put_pages_list(&pagepool); |
|
kvfree(bgq); |
|
} |
|
|
|
static struct page *pickup_page_for_submission(struct z_erofs_pcluster *pcl, |
|
unsigned int nr, |
|
struct list_head *pagepool, |
|
struct address_space *mc, |
|
gfp_t gfp) |
|
{ |
|
const pgoff_t index = pcl->obj.index; |
|
bool tocache = false; |
|
|
|
struct address_space *mapping; |
|
struct page *oldpage, *page; |
|
|
|
compressed_page_t t; |
|
int justfound; |
|
|
|
repeat: |
|
page = READ_ONCE(pcl->compressed_pages[nr]); |
|
oldpage = page; |
|
|
|
if (!page) |
|
goto out_allocpage; |
|
|
|
/* |
|
* the cached page has not been allocated and |
|
* an placeholder is out there, prepare it now. |
|
*/ |
|
if (page == PAGE_UNALLOCATED) { |
|
tocache = true; |
|
goto out_allocpage; |
|
} |
|
|
|
/* process the target tagged pointer */ |
|
t = tagptr_init(compressed_page_t, page); |
|
justfound = tagptr_unfold_tags(t); |
|
page = tagptr_unfold_ptr(t); |
|
|
|
/* |
|
* preallocated cached pages, which is used to avoid direct reclaim |
|
* otherwise, it will go inplace I/O path instead. |
|
*/ |
|
if (page->private == Z_EROFS_PREALLOCATED_PAGE) { |
|
WRITE_ONCE(pcl->compressed_pages[nr], page); |
|
set_page_private(page, 0); |
|
tocache = true; |
|
goto out_tocache; |
|
} |
|
mapping = READ_ONCE(page->mapping); |
|
|
|
/* |
|
* file-backed online pages in plcuster are all locked steady, |
|
* therefore it is impossible for `mapping' to be NULL. |
|
*/ |
|
if (mapping && mapping != mc) |
|
/* ought to be unmanaged pages */ |
|
goto out; |
|
|
|
/* directly return for shortlived page as well */ |
|
if (z_erofs_is_shortlived_page(page)) |
|
goto out; |
|
|
|
lock_page(page); |
|
|
|
/* only true if page reclaim goes wrong, should never happen */ |
|
DBG_BUGON(justfound && PagePrivate(page)); |
|
|
|
/* the page is still in manage cache */ |
|
if (page->mapping == mc) { |
|
WRITE_ONCE(pcl->compressed_pages[nr], page); |
|
|
|
ClearPageError(page); |
|
if (!PagePrivate(page)) { |
|
/* |
|
* impossible to be !PagePrivate(page) for |
|
* the current restriction as well if |
|
* the page is already in compressed_pages[]. |
|
*/ |
|
DBG_BUGON(!justfound); |
|
|
|
justfound = 0; |
|
set_page_private(page, (unsigned long)pcl); |
|
SetPagePrivate(page); |
|
} |
|
|
|
/* no need to submit io if it is already up-to-date */ |
|
if (PageUptodate(page)) { |
|
unlock_page(page); |
|
page = NULL; |
|
} |
|
goto out; |
|
} |
|
|
|
/* |
|
* the managed page has been truncated, it's unsafe to |
|
* reuse this one, let's allocate a new cache-managed page. |
|
*/ |
|
DBG_BUGON(page->mapping); |
|
DBG_BUGON(!justfound); |
|
|
|
tocache = true; |
|
unlock_page(page); |
|
put_page(page); |
|
out_allocpage: |
|
page = erofs_allocpage(pagepool, gfp | __GFP_NOFAIL); |
|
if (oldpage != cmpxchg(&pcl->compressed_pages[nr], oldpage, page)) { |
|
list_add(&page->lru, pagepool); |
|
cond_resched(); |
|
goto repeat; |
|
} |
|
out_tocache: |
|
if (!tocache || add_to_page_cache_lru(page, mc, index + nr, gfp)) { |
|
/* turn into temporary page if fails (1 ref) */ |
|
set_page_private(page, Z_EROFS_SHORTLIVED_PAGE); |
|
goto out; |
|
} |
|
attach_page_private(page, pcl); |
|
/* drop a refcount added by allocpage (then we have 2 refs here) */ |
|
put_page(page); |
|
|
|
out: /* the only exit (for tracing and debugging) */ |
|
return page; |
|
} |
|
|
|
static struct z_erofs_decompressqueue * |
|
jobqueue_init(struct super_block *sb, |
|
struct z_erofs_decompressqueue *fgq, bool *fg) |
|
{ |
|
struct z_erofs_decompressqueue *q; |
|
|
|
if (fg && !*fg) { |
|
q = kvzalloc(sizeof(*q), GFP_KERNEL | __GFP_NOWARN); |
|
if (!q) { |
|
*fg = true; |
|
goto fg_out; |
|
} |
|
INIT_WORK(&q->u.work, z_erofs_decompressqueue_work); |
|
} else { |
|
fg_out: |
|
q = fgq; |
|
init_waitqueue_head(&fgq->u.wait); |
|
atomic_set(&fgq->pending_bios, 0); |
|
} |
|
q->sb = sb; |
|
q->head = Z_EROFS_PCLUSTER_TAIL_CLOSED; |
|
return q; |
|
} |
|
|
|
/* define decompression jobqueue types */ |
|
enum { |
|
JQ_BYPASS, |
|
JQ_SUBMIT, |
|
NR_JOBQUEUES, |
|
}; |
|
|
|
static void *jobqueueset_init(struct super_block *sb, |
|
struct z_erofs_decompressqueue *q[], |
|
struct z_erofs_decompressqueue *fgq, bool *fg) |
|
{ |
|
/* |
|
* if managed cache is enabled, bypass jobqueue is needed, |
|
* no need to read from device for all pclusters in this queue. |
|
*/ |
|
q[JQ_BYPASS] = jobqueue_init(sb, fgq + JQ_BYPASS, NULL); |
|
q[JQ_SUBMIT] = jobqueue_init(sb, fgq + JQ_SUBMIT, fg); |
|
|
|
return tagptr_cast_ptr(tagptr_fold(tagptr1_t, q[JQ_SUBMIT], *fg)); |
|
} |
|
|
|
static void move_to_bypass_jobqueue(struct z_erofs_pcluster *pcl, |
|
z_erofs_next_pcluster_t qtail[], |
|
z_erofs_next_pcluster_t owned_head) |
|
{ |
|
z_erofs_next_pcluster_t *const submit_qtail = qtail[JQ_SUBMIT]; |
|
z_erofs_next_pcluster_t *const bypass_qtail = qtail[JQ_BYPASS]; |
|
|
|
DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); |
|
if (owned_head == Z_EROFS_PCLUSTER_TAIL) |
|
owned_head = Z_EROFS_PCLUSTER_TAIL_CLOSED; |
|
|
|
WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_TAIL_CLOSED); |
|
|
|
WRITE_ONCE(*submit_qtail, owned_head); |
|
WRITE_ONCE(*bypass_qtail, &pcl->next); |
|
|
|
qtail[JQ_BYPASS] = &pcl->next; |
|
} |
|
|
|
static void z_erofs_submit_queue(struct super_block *sb, |
|
struct z_erofs_decompress_frontend *f, |
|
struct list_head *pagepool, |
|
struct z_erofs_decompressqueue *fgq, |
|
bool *force_fg) |
|
{ |
|
struct erofs_sb_info *const sbi = EROFS_SB(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; |
|
/* since bio will be NULL, no need to initialize last_index */ |
|
pgoff_t last_index; |
|
unsigned int nr_bios = 0; |
|
struct bio *bio = NULL; |
|
|
|
bi_private = jobqueueset_init(sb, q, fgq, force_fg); |
|
qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head; |
|
qtail[JQ_SUBMIT] = &q[JQ_SUBMIT]->head; |
|
|
|
/* by default, all need io submission */ |
|
q[JQ_SUBMIT]->head = owned_head; |
|
|
|
do { |
|
struct z_erofs_pcluster *pcl; |
|
pgoff_t cur, end; |
|
unsigned int i = 0; |
|
bool bypass = true; |
|
|
|
/* no possible 'owned_head' equals the following */ |
|
DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); |
|
DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_NIL); |
|
|
|
pcl = container_of(owned_head, struct z_erofs_pcluster, next); |
|
|
|
cur = pcl->obj.index; |
|
end = cur + pcl->pclusterpages; |
|
|
|
/* close the main owned chain at first */ |
|
owned_head = cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, |
|
Z_EROFS_PCLUSTER_TAIL_CLOSED); |
|
|
|
do { |
|
struct page *page; |
|
|
|
page = pickup_page_for_submission(pcl, i++, pagepool, |
|
MNGD_MAPPING(sbi), |
|
GFP_NOFS); |
|
if (!page) |
|
continue; |
|
|
|
if (bio && cur != last_index + 1) { |
|
submit_bio_retry: |
|
submit_bio(bio); |
|
bio = NULL; |
|
} |
|
|
|
if (!bio) { |
|
bio = bio_alloc(GFP_NOIO, BIO_MAX_VECS); |
|
|
|
bio->bi_end_io = z_erofs_decompressqueue_endio; |
|
bio_set_dev(bio, sb->s_bdev); |
|
bio->bi_iter.bi_sector = (sector_t)cur << |
|
LOG_SECTORS_PER_BLOCK; |
|
bio->bi_private = bi_private; |
|
bio->bi_opf = REQ_OP_READ; |
|
if (f->readahead) |
|
bio->bi_opf |= REQ_RAHEAD; |
|
++nr_bios; |
|
} |
|
|
|
if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) |
|
goto submit_bio_retry; |
|
|
|
last_index = cur; |
|
bypass = false; |
|
} while (++cur < end); |
|
|
|
if (!bypass) |
|
qtail[JQ_SUBMIT] = &pcl->next; |
|
else |
|
move_to_bypass_jobqueue(pcl, qtail, owned_head); |
|
} while (owned_head != Z_EROFS_PCLUSTER_TAIL); |
|
|
|
if (bio) |
|
submit_bio(bio); |
|
|
|
/* |
|
* although background is preferred, no one is pending for submission. |
|
* don't issue workqueue for decompression but drop it directly instead. |
|
*/ |
|
if (!*force_fg && !nr_bios) { |
|
kvfree(q[JQ_SUBMIT]); |
|
return; |
|
} |
|
z_erofs_decompress_kickoff(q[JQ_SUBMIT], *force_fg, nr_bios); |
|
} |
|
|
|
static void z_erofs_runqueue(struct super_block *sb, |
|
struct z_erofs_decompress_frontend *f, |
|
struct list_head *pagepool, bool force_fg) |
|
{ |
|
struct z_erofs_decompressqueue io[NR_JOBQUEUES]; |
|
|
|
if (f->clt.owned_head == Z_EROFS_PCLUSTER_TAIL) |
|
return; |
|
z_erofs_submit_queue(sb, f, pagepool, io, &force_fg); |
|
|
|
/* handle bypass queue (no i/o pclusters) immediately */ |
|
z_erofs_decompress_queue(&io[JQ_BYPASS], pagepool); |
|
|
|
if (!force_fg) |
|
return; |
|
|
|
/* wait until all bios are completed */ |
|
io_wait_event(io[JQ_SUBMIT].u.wait, |
|
!atomic_read(&io[JQ_SUBMIT].pending_bios)); |
|
|
|
/* handle synchronous decompress queue in the caller context */ |
|
z_erofs_decompress_queue(&io[JQ_SUBMIT], pagepool); |
|
} |
|
|
|
static int z_erofs_readpage(struct file *file, struct page *page) |
|
{ |
|
struct inode *const inode = page->mapping->host; |
|
struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); |
|
int err; |
|
LIST_HEAD(pagepool); |
|
|
|
trace_erofs_readpage(page, false); |
|
|
|
f.headoffset = (erofs_off_t)page->index << PAGE_SHIFT; |
|
|
|
err = z_erofs_do_read_page(&f, page, &pagepool); |
|
(void)z_erofs_collector_end(&f.clt); |
|
|
|
/* if some compressed cluster ready, need submit them anyway */ |
|
z_erofs_runqueue(inode->i_sb, &f, &pagepool, true); |
|
|
|
if (err) |
|
erofs_err(inode->i_sb, "failed to read, err [%d]", err); |
|
|
|
if (f.map.mpage) |
|
put_page(f.map.mpage); |
|
|
|
/* clean up the remaining free pages */ |
|
put_pages_list(&pagepool); |
|
return err; |
|
} |
|
|
|
static void z_erofs_readahead(struct readahead_control *rac) |
|
{ |
|
struct inode *const inode = rac->mapping->host; |
|
struct erofs_sb_info *const sbi = EROFS_I_SB(inode); |
|
|
|
unsigned int nr_pages = readahead_count(rac); |
|
bool sync = (sbi->ctx.readahead_sync_decompress && |
|
nr_pages <= sbi->ctx.max_sync_decompress_pages); |
|
struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); |
|
struct page *page, *head = NULL; |
|
LIST_HEAD(pagepool); |
|
|
|
trace_erofs_readpages(inode, readahead_index(rac), nr_pages, false); |
|
|
|
f.readahead = true; |
|
f.headoffset = readahead_pos(rac); |
|
|
|
while ((page = readahead_page(rac))) { |
|
prefetchw(&page->flags); |
|
|
|
/* |
|
* A pure asynchronous readahead is indicated if |
|
* a PG_readahead marked page is hitted at first. |
|
* Let's also do asynchronous decompression for this case. |
|
*/ |
|
sync &= !(PageReadahead(page) && !head); |
|
|
|
set_page_private(page, (unsigned long)head); |
|
head = page; |
|
} |
|
|
|
while (head) { |
|
struct page *page = head; |
|
int err; |
|
|
|
/* traversal in reverse order */ |
|
head = (void *)page_private(page); |
|
|
|
err = z_erofs_do_read_page(&f, page, &pagepool); |
|
if (err) |
|
erofs_err(inode->i_sb, |
|
"readahead error at page %lu @ nid %llu", |
|
page->index, EROFS_I(inode)->nid); |
|
put_page(page); |
|
} |
|
|
|
(void)z_erofs_collector_end(&f.clt); |
|
|
|
z_erofs_runqueue(inode->i_sb, &f, &pagepool, sync); |
|
|
|
if (f.map.mpage) |
|
put_page(f.map.mpage); |
|
|
|
/* clean up the remaining free pages */ |
|
put_pages_list(&pagepool); |
|
} |
|
|
|
const struct address_space_operations z_erofs_aops = { |
|
.readpage = z_erofs_readpage, |
|
.readahead = z_erofs_readahead, |
|
};
|
|
|