^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* AFS filesystem file handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/writeback.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/task_io_accounting_ops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static int afs_file_mmap(struct file *file, struct vm_area_struct *vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static int afs_readpage(struct file *file, struct page *page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static void afs_invalidatepage(struct page *page, unsigned int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) unsigned int length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static int afs_releasepage(struct page *page, gfp_t gfp_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static int afs_readpages(struct file *filp, struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct list_head *pages, unsigned nr_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) const struct file_operations afs_file_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) .open = afs_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) .release = afs_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) .llseek = generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) .read_iter = generic_file_read_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) .write_iter = afs_file_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) .mmap = afs_file_mmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) .splice_read = generic_file_splice_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) .splice_write = iter_file_splice_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) .fsync = afs_fsync,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) .lock = afs_lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) .flock = afs_flock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) const struct inode_operations afs_file_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) .getattr = afs_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) .setattr = afs_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) .permission = afs_permission,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) const struct address_space_operations afs_fs_aops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) .readpage = afs_readpage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) .readpages = afs_readpages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) .set_page_dirty = afs_set_page_dirty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) .launder_page = afs_launder_page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) .releasepage = afs_releasepage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) .invalidatepage = afs_invalidatepage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) .write_begin = afs_write_begin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) .write_end = afs_write_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) .writepage = afs_writepage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) .writepages = afs_writepages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static const struct vm_operations_struct afs_vm_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) .fault = filemap_fault,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) .map_pages = filemap_map_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) .page_mkwrite = afs_page_mkwrite,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * Discard a pin on a writeback key.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) void afs_put_wb_key(struct afs_wb_key *wbk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (wbk && refcount_dec_and_test(&wbk->usage)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) key_put(wbk->key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) kfree(wbk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * Cache key for writeback.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) int afs_cache_wb_key(struct afs_vnode *vnode, struct afs_file *af)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct afs_wb_key *wbk, *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) wbk = kzalloc(sizeof(struct afs_wb_key), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (!wbk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) refcount_set(&wbk->usage, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) wbk->key = af->key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) spin_lock(&vnode->wb_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) list_for_each_entry(p, &vnode->wb_keys, vnode_link) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (p->key == wbk->key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) key_get(wbk->key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) list_add_tail(&wbk->vnode_link, &vnode->wb_keys);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) spin_unlock(&vnode->wb_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) af->wb = wbk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) found:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) refcount_inc(&p->usage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) spin_unlock(&vnode->wb_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) af->wb = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) kfree(wbk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * open an AFS file or directory and attach a key to it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) int afs_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct afs_vnode *vnode = AFS_FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) struct afs_file *af;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct key *key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) _enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) key = afs_request_key(vnode->volume->cell);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (IS_ERR(key)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) ret = PTR_ERR(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) af = kzalloc(sizeof(*af), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (!af) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) goto error_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) af->key = key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) ret = afs_validate(vnode, key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) goto error_af;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (file->f_mode & FMODE_WRITE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) ret = afs_cache_wb_key(vnode, af);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) goto error_af;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (file->f_flags & O_TRUNC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) file->private_data = af;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) _leave(" = 0");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) error_af:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) kfree(af);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) error_key:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) key_put(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) _leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * release an AFS file or directory and discard its key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) int afs_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) struct afs_vnode *vnode = AFS_FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) struct afs_file *af = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) _enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) if ((file->f_mode & FMODE_WRITE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) ret = vfs_fsync(file, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) file->private_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (af->wb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) afs_put_wb_key(af->wb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) key_put(af->key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) kfree(af);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) afs_prune_wb_keys(vnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) _leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * Dispose of a ref to a read record.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) void afs_put_read(struct afs_read *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (refcount_dec_and_test(&req->usage)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (req->pages) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) for (i = 0; i < req->nr_pages; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) if (req->pages[i])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) put_page(req->pages[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (req->pages != req->array)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) kfree(req->pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) kfree(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) #ifdef CONFIG_AFS_FSCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * deal with notification that a page was read from the cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static void afs_file_readpage_read_complete(struct page *page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) void *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) int error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) _enter("%p,%p,%d", page, data, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) /* if the read completes with an error, we just unlock the page and let
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) * the VM reissue the readpage */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) static void afs_fetch_data_success(struct afs_operation *op)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) struct afs_vnode *vnode = op->file[0].vnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) _enter("op=%08x", op->debug_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) afs_vnode_commit_status(op, &op->file[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) afs_stat_v(vnode, n_fetches);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) atomic_long_add(op->fetch.req->actual_len, &op->net->n_fetch_bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) static void afs_fetch_data_put(struct afs_operation *op)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) afs_put_read(op->fetch.req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) static const struct afs_operation_ops afs_fetch_data_operation = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) .issue_afs_rpc = afs_fs_fetch_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) .issue_yfs_rpc = yfs_fs_fetch_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) .success = afs_fetch_data_success,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) .aborted = afs_check_for_remote_deletion,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) .put = afs_fetch_data_put,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * Fetch file data from the volume.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) int afs_fetch_data(struct afs_vnode *vnode, struct key *key, struct afs_read *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) struct afs_operation *op;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) _enter("%s{%llx:%llu.%u},%x,,,",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) vnode->volume->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) vnode->fid.vid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) vnode->fid.vnode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) vnode->fid.unique,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) key_serial(key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) op = afs_alloc_operation(key, vnode->volume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (IS_ERR(op))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return PTR_ERR(op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) afs_op_set_vnode(op, 0, vnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) op->fetch.req = afs_get_read(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) op->ops = &afs_fetch_data_operation;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return afs_do_sync_operation(op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * read page from file, directory or symlink, given a key to use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) int afs_page_filler(void *data, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) struct inode *inode = page->mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) struct afs_vnode *vnode = AFS_FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) struct afs_read *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) struct key *key = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) _enter("{%x},{%lu},{%lu}", key_serial(key), inode->i_ino, page->index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) BUG_ON(!PageLocked(page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) ret = -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) /* is it cached? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) #ifdef CONFIG_AFS_FSCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) ret = fscache_read_or_alloc_page(vnode->cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) afs_file_readpage_read_complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) ret = -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) /* read BIO submitted (page in cache) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) /* page not yet cached */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) case -ENODATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) _debug("cache said ENODATA");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) goto go_on;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) /* page will not be cached */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) case -ENOBUFS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) _debug("cache said ENOBUFS");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) go_on:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) req = kzalloc(struct_size(req, array, 1), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) if (!req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) goto enomem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) /* We request a full page. If the page is a partial one at the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) * end of the file, the server will return a short read and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) * unmarshalling code will clear the unfilled space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) refcount_set(&req->usage, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) req->pos = (loff_t)page->index << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) req->len = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) req->nr_pages = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) req->pages = req->array;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) req->pages[0] = page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) get_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) /* read the contents of the file from the server into the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) ret = afs_fetch_data(vnode, key, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) afs_put_read(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) if (ret == -ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) _debug("got NOENT from server"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) " - marking file deleted and stale");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) set_bit(AFS_VNODE_DELETED, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) ret = -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) #ifdef CONFIG_AFS_FSCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) fscache_uncache_page(vnode->cache, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) BUG_ON(PageFsCache(page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) if (ret == -EINTR ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) ret == -ENOMEM ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) ret == -ERESTARTSYS ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) ret == -EAGAIN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) goto io_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) /* send the page to the cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) #ifdef CONFIG_AFS_FSCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (PageFsCache(page) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) fscache_write_page(vnode->cache, page, vnode->status.size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) GFP_KERNEL) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) fscache_uncache_page(vnode->cache, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) BUG_ON(PageFsCache(page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) _leave(" = 0");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) io_error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) SetPageError(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) enomem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) _leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) * read page from file, directory or symlink, given a file to nominate the key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) * to be used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) static int afs_readpage(struct file *file, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) struct key *key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) if (file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) key = afs_file_key(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) ASSERT(key != NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) ret = afs_page_filler(key, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) struct inode *inode = page->mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) key = afs_request_key(AFS_FS_S(inode->i_sb)->cell);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (IS_ERR(key)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) ret = PTR_ERR(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) ret = afs_page_filler(key, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) key_put(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) * Make pages available as they're filled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) static void afs_readpages_page_done(struct afs_read *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) #ifdef CONFIG_AFS_FSCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) struct afs_vnode *vnode = req->vnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) struct page *page = req->pages[req->index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) req->pages[req->index] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) /* send the page to the cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) #ifdef CONFIG_AFS_FSCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) if (PageFsCache(page) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) fscache_write_page(vnode->cache, page, vnode->status.size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) GFP_KERNEL) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) fscache_uncache_page(vnode->cache, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) BUG_ON(PageFsCache(page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) * Read a contiguous set of pages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) static int afs_readpages_one(struct file *file, struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) struct list_head *pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) struct afs_vnode *vnode = AFS_FS_I(mapping->host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) struct afs_read *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) struct list_head *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) struct page *first, *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) struct key *key = afs_file_key(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) pgoff_t index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) int ret, n, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) /* Count the number of contiguous pages at the front of the list. Note
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * that the list goes prev-wards rather than next-wards.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) first = lru_to_page(pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) index = first->index + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) n = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) for (p = first->lru.prev; p != pages; p = p->prev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) page = list_entry(p, struct page, lru);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) if (page->index != index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) index++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) n++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) req = kzalloc(struct_size(req, array, n), GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (!req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) refcount_set(&req->usage, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) req->vnode = vnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) req->page_done = afs_readpages_page_done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) req->pos = first->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) req->pos <<= PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) req->pages = req->array;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) /* Transfer the pages to the request. We add them in until one fails
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) * to add to the LRU and then we stop (as that'll make a hole in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) * contiguous run.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) * Note that it's possible for the file size to change whilst we're
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) * doing this, but we rely on the server returning less than we asked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * for if the file shrank. We also rely on this to deal with a partial
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) * page at the end of the file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) page = lru_to_page(pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) list_del(&page->lru);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) index = page->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) if (add_to_page_cache_lru(page, mapping, index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) readahead_gfp_mask(mapping))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) #ifdef CONFIG_AFS_FSCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) fscache_uncache_page(vnode->cache, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) req->pages[req->nr_pages++] = page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) req->len += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) } while (req->nr_pages < n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) if (req->nr_pages == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) kfree(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) ret = afs_fetch_data(vnode, key, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) task_io_account_read(PAGE_SIZE * req->nr_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) afs_put_read(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) if (ret == -ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) _debug("got NOENT from server"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) " - marking file deleted and stale");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) set_bit(AFS_VNODE_DELETED, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) ret = -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) for (i = 0; i < req->nr_pages; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) page = req->pages[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) #ifdef CONFIG_AFS_FSCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) fscache_uncache_page(vnode->cache, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) SetPageError(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) afs_put_read(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) * read a set of pages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) static int afs_readpages(struct file *file, struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) struct list_head *pages, unsigned nr_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) struct key *key = afs_file_key(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) struct afs_vnode *vnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) _enter("{%d},{%lu},,%d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) key_serial(key), mapping->host->i_ino, nr_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) ASSERT(key != NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) vnode = AFS_FS_I(mapping->host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) _leave(" = -ESTALE");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) return -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) /* attempt to read as many of the pages as possible */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) #ifdef CONFIG_AFS_FSCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) ret = fscache_read_or_alloc_pages(vnode->cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) &nr_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) afs_file_readpage_read_complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) mapping_gfp_mask(mapping));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) ret = -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) /* all pages are being read from the cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) BUG_ON(!list_empty(pages));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) BUG_ON(nr_pages != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) _leave(" = 0 [reading all]");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) /* there were pages that couldn't be read from the cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) case -ENODATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) case -ENOBUFS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) /* other error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) _leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) while (!list_empty(pages)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) ret = afs_readpages_one(file, mapping, pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) _leave(" = %d [netting]", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) * Adjust the dirty region of the page on truncation or full invalidation,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) * getting rid of the markers altogether if the region is entirely invalidated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) static void afs_invalidate_dirty(struct page *page, unsigned int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) unsigned int length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) unsigned long priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) unsigned int f, t, end = offset + length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) priv = page_private(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) /* we clean up only if the entire page is being invalidated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) if (offset == 0 && length == thp_size(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) goto full_invalidate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) /* If the page was dirtied by page_mkwrite(), the PTE stays writable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) * and we don't get another notification to tell us to expand it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) * again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) if (afs_is_page_dirty_mmapped(priv))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) /* We may need to shorten the dirty region */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) f = afs_page_dirty_from(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) t = afs_page_dirty_to(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) if (t <= offset || f >= end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) return; /* Doesn't overlap */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) if (f < offset && t > end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) return; /* Splits the dirty region - just absorb it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) if (f >= offset && t <= end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) goto undirty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) if (f < offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) t = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) f = end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) if (f == t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) goto undirty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) priv = afs_page_dirty(f, t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) set_page_private(page, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) trace_afs_page_dirty(vnode, tracepoint_string("trunc"), page->index, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) undirty:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) trace_afs_page_dirty(vnode, tracepoint_string("undirty"), page->index, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) clear_page_dirty_for_io(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) full_invalidate:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) priv = (unsigned long)detach_page_private(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) trace_afs_page_dirty(vnode, tracepoint_string("inval"), page->index, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) * invalidate part or all of a page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) * - release a page and clean up its private data if offset is 0 (indicating
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) * the entire page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) static void afs_invalidatepage(struct page *page, unsigned int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) unsigned int length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) _enter("{%lu},%u,%u", page->index, offset, length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) BUG_ON(!PageLocked(page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) #ifdef CONFIG_AFS_FSCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) /* we clean up only if the entire page is being invalidated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) if (offset == 0 && length == PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) if (PageFsCache(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) fscache_wait_on_page_write(vnode->cache, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) fscache_uncache_page(vnode->cache, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) if (PagePrivate(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) afs_invalidate_dirty(page, offset, length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) _leave("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) * release a page and clean up its private state if it's not busy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) * - return true if the page can now be released, false if not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) static int afs_releasepage(struct page *page, gfp_t gfp_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) unsigned long priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) _enter("{{%llx:%llu}[%lu],%lx},%x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) vnode->fid.vid, vnode->fid.vnode, page->index, page->flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) gfp_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) /* deny if page is being written to the cache and the caller hasn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) * elected to wait */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) #ifdef CONFIG_AFS_FSCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) if (!fscache_maybe_release_page(vnode->cache, page, gfp_flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) _leave(" = F [cache busy]");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) if (PagePrivate(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) priv = (unsigned long)detach_page_private(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) trace_afs_page_dirty(vnode, tracepoint_string("rel"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) page->index, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) /* indicate that the page can be released */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) _leave(" = T");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) * Handle setting up a memory mapping on an AFS file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) static int afs_file_mmap(struct file *file, struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) ret = generic_file_mmap(file, vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) vma->vm_ops = &afs_vm_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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