int __v9fs_readpages_from_fscache(struct inode *inode, struct address_space *mapping, struct list_head *pages, unsigned *nr_pages) { int ret; const struct v9fs_inode *v9inode = V9FS_I(inode); P9_DPRINTK(P9_DEBUG_FSC, "inode %p pages %u", inode, *nr_pages); if (!v9inode->fscache) return -ENOBUFS; ret = fscache_read_or_alloc_pages(v9inode->fscache, mapping, pages, nr_pages, v9fs_vfs_readpage_complete, NULL, mapping_gfp_mask(mapping)); switch (ret) { case -ENOBUFS: case -ENODATA: P9_DPRINTK(P9_DEBUG_FSC, "pages/inodes not in cache %d", ret); return 1; case 0: BUG_ON(!list_empty(pages)); BUG_ON(*nr_pages != 0); P9_DPRINTK(P9_DEBUG_FSC, "BIO submitted"); return ret; default: P9_DPRINTK(P9_DEBUG_FSC, "ret %d", ret); return ret; } }
static int afs_readpages(struct file *file, struct address_space *mapping, struct list_head *pages, unsigned nr_pages) { struct key *key = file->private_data; struct afs_vnode *vnode; int ret = 0; _enter("{%d},{%lu},,%d", key_serial(key), mapping->host->i_ino, nr_pages); ASSERT(key != NULL); vnode = AFS_FS_I(mapping->host); if (vnode->flags & AFS_VNODE_DELETED) { _leave(" = -ESTALE"); return -ESTALE; } /* attempt to read as many of the pages as possible */ #ifdef CONFIG_AFS_FSCACHE ret = fscache_read_or_alloc_pages(vnode->cache, mapping, pages, &nr_pages, afs_file_readpage_read_complete, NULL, mapping_gfp_mask(mapping)); #else ret = -ENOBUFS; #endif switch (ret) { /* all pages are being read from the cache */ case 0: BUG_ON(!list_empty(pages)); BUG_ON(nr_pages != 0); _leave(" = 0 [reading all]"); return 0; /* there were pages that couldn't be read from the cache */ case -ENODATA: case -ENOBUFS: break; /* other error */ default: _leave(" = %d", ret); return ret; } /* load the missing pages from the network */ ret = read_cache_pages(mapping, pages, afs_page_filler, key); _leave(" = %d [netting]", ret); return ret; }
static int afs_file_readpages(struct file *filp, struct address_space *mapping, struct list_head *pages, unsigned nr_pages) { struct afs_vnode *vnode; #if 0 struct pagevec lru_pvec; unsigned page_idx; #endif int ret = 0; _enter(",{%lu},,%d", mapping->host->i_ino, nr_pages); vnode = AFS_FS_I(mapping->host); if (vnode->flags & AFS_VNODE_DELETED) { _leave(" = -ESTALE"); return -ESTALE; } /* attempt to read as many of the pages as possible */ ret = fscache_read_or_alloc_pages(vnode->cache, mapping, pages, &nr_pages, afs_file_readpage_read_complete, NULL, mapping_gfp_mask(mapping)); switch (ret) { /* all pages are being read from the cache */ case 0: BUG_ON(!list_empty(pages)); BUG_ON(nr_pages != 0); _leave(" = 0 [reading all]"); return 0; /* there were pages that couldn't be read from the cache */ case -ENODATA: case -ENOBUFS: break; /* other error */ default: _leave(" = %d", ret); return ret; } /* load the missing pages from the network */ ret = read_cache_pages(mapping, pages, (void *) afs_file_readpage, NULL); _leave(" = %d [netting]", ret); return ret; } /* end afs_file_readpages() */
/* * Retrieve a set of pages from fscache */ int __nfs_readpages_from_fscache(struct nfs_open_context *ctx, struct inode *inode, struct address_space *mapping, struct list_head *pages, unsigned *nr_pages) { unsigned npages = *nr_pages; int ret; // dfprintk(FSCACHE, "NFS: nfs_getpages_from_fscache (0x%p/%u/0x%p)\n", ; ret = fscache_read_or_alloc_pages(NFS_I(inode)->fscache, mapping, pages, nr_pages, nfs_readpage_from_fscache_complete, ctx, mapping_gfp_mask(mapping)); if (*nr_pages < npages) nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_OK, npages); if (*nr_pages > 0) nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_FAIL, *nr_pages); switch (ret) { case 0: /* read submitted to the cache for all pages */ BUG_ON(!list_empty(pages)); BUG_ON(*nr_pages != 0); // dfprintk(FSCACHE, ; return ret; case -ENOBUFS: /* some pages aren't cached and can't be */ case -ENODATA: /* some pages aren't cached */ // dfprintk(FSCACHE, ; return 1; default: // dfprintk(FSCACHE, ; } return ret; }