494 lines
13 KiB
C
494 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/* AFS filesystem directory editing
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*
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* Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/namei.h>
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#include <linux/pagemap.h>
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#include <linux/iversion.h>
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#include "internal.h"
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#include "xdr_fs.h"
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/*
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* Find a number of contiguous clear bits in a directory block bitmask.
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*
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* There are 64 slots, which means we can load the entire bitmap into a
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* variable. The first bit doesn't count as it corresponds to the block header
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* slot. nr_slots is between 1 and 9.
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*/
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static int afs_find_contig_bits(union afs_xdr_dir_block *block, unsigned int nr_slots)
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{
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u64 bitmap;
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u32 mask;
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int bit, n;
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bitmap = (u64)block->hdr.bitmap[0] << 0 * 8;
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bitmap |= (u64)block->hdr.bitmap[1] << 1 * 8;
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bitmap |= (u64)block->hdr.bitmap[2] << 2 * 8;
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bitmap |= (u64)block->hdr.bitmap[3] << 3 * 8;
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bitmap |= (u64)block->hdr.bitmap[4] << 4 * 8;
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bitmap |= (u64)block->hdr.bitmap[5] << 5 * 8;
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bitmap |= (u64)block->hdr.bitmap[6] << 6 * 8;
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bitmap |= (u64)block->hdr.bitmap[7] << 7 * 8;
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bitmap >>= 1; /* The first entry is metadata */
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bit = 1;
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mask = (1 << nr_slots) - 1;
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do {
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if (sizeof(unsigned long) == 8)
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n = ffz(bitmap);
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else
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n = ((u32)bitmap) != 0 ?
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ffz((u32)bitmap) :
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ffz((u32)(bitmap >> 32)) + 32;
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bitmap >>= n;
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bit += n;
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if ((bitmap & mask) == 0) {
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if (bit > 64 - nr_slots)
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return -1;
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return bit;
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}
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n = __ffs(bitmap);
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bitmap >>= n;
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bit += n;
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} while (bitmap);
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return -1;
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}
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/*
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* Set a number of contiguous bits in the directory block bitmap.
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*/
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static void afs_set_contig_bits(union afs_xdr_dir_block *block,
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int bit, unsigned int nr_slots)
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{
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u64 mask;
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mask = (1 << nr_slots) - 1;
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mask <<= bit;
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block->hdr.bitmap[0] |= (u8)(mask >> 0 * 8);
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block->hdr.bitmap[1] |= (u8)(mask >> 1 * 8);
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block->hdr.bitmap[2] |= (u8)(mask >> 2 * 8);
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block->hdr.bitmap[3] |= (u8)(mask >> 3 * 8);
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block->hdr.bitmap[4] |= (u8)(mask >> 4 * 8);
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block->hdr.bitmap[5] |= (u8)(mask >> 5 * 8);
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block->hdr.bitmap[6] |= (u8)(mask >> 6 * 8);
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block->hdr.bitmap[7] |= (u8)(mask >> 7 * 8);
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}
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/*
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* Clear a number of contiguous bits in the directory block bitmap.
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*/
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static void afs_clear_contig_bits(union afs_xdr_dir_block *block,
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int bit, unsigned int nr_slots)
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{
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u64 mask;
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mask = (1 << nr_slots) - 1;
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mask <<= bit;
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block->hdr.bitmap[0] &= ~(u8)(mask >> 0 * 8);
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block->hdr.bitmap[1] &= ~(u8)(mask >> 1 * 8);
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block->hdr.bitmap[2] &= ~(u8)(mask >> 2 * 8);
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block->hdr.bitmap[3] &= ~(u8)(mask >> 3 * 8);
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block->hdr.bitmap[4] &= ~(u8)(mask >> 4 * 8);
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block->hdr.bitmap[5] &= ~(u8)(mask >> 5 * 8);
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block->hdr.bitmap[6] &= ~(u8)(mask >> 6 * 8);
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block->hdr.bitmap[7] &= ~(u8)(mask >> 7 * 8);
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}
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/*
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* Get a new directory folio.
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*/
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static struct folio *afs_dir_get_folio(struct afs_vnode *vnode, pgoff_t index)
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{
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struct address_space *mapping = vnode->netfs.inode.i_mapping;
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struct folio *folio;
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folio = __filemap_get_folio(mapping, index,
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FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
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mapping->gfp_mask);
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if (!folio)
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clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
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else if (folio && !folio_test_private(folio))
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folio_attach_private(folio, (void *)1);
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return folio;
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}
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/*
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* Scan a directory block looking for a dirent of the right name.
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*/
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static int afs_dir_scan_block(union afs_xdr_dir_block *block, struct qstr *name,
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unsigned int blocknum)
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{
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union afs_xdr_dirent *de;
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u64 bitmap;
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int d, len, n;
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_enter("");
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bitmap = (u64)block->hdr.bitmap[0] << 0 * 8;
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bitmap |= (u64)block->hdr.bitmap[1] << 1 * 8;
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bitmap |= (u64)block->hdr.bitmap[2] << 2 * 8;
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bitmap |= (u64)block->hdr.bitmap[3] << 3 * 8;
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bitmap |= (u64)block->hdr.bitmap[4] << 4 * 8;
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bitmap |= (u64)block->hdr.bitmap[5] << 5 * 8;
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bitmap |= (u64)block->hdr.bitmap[6] << 6 * 8;
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bitmap |= (u64)block->hdr.bitmap[7] << 7 * 8;
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for (d = (blocknum == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
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d < AFS_DIR_SLOTS_PER_BLOCK;
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d++) {
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if (!((bitmap >> d) & 1))
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continue;
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de = &block->dirents[d];
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if (de->u.valid != 1)
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continue;
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/* The block was NUL-terminated by afs_dir_check_page(). */
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len = strlen(de->u.name);
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if (len == name->len &&
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memcmp(de->u.name, name->name, name->len) == 0)
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return d;
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n = round_up(12 + len + 1 + 4, AFS_DIR_DIRENT_SIZE);
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n /= AFS_DIR_DIRENT_SIZE;
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d += n - 1;
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}
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return -1;
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}
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/*
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* Initialise a new directory block. Note that block 0 is special and contains
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* some extra metadata.
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*/
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static void afs_edit_init_block(union afs_xdr_dir_block *meta,
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union afs_xdr_dir_block *block, int block_num)
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{
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memset(block, 0, sizeof(*block));
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block->hdr.npages = htons(1);
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block->hdr.magic = AFS_DIR_MAGIC;
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block->hdr.bitmap[0] = 1;
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if (block_num == 0) {
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block->hdr.bitmap[0] = 0xff;
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block->hdr.bitmap[1] = 0x1f;
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memset(block->meta.alloc_ctrs,
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AFS_DIR_SLOTS_PER_BLOCK,
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sizeof(block->meta.alloc_ctrs));
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meta->meta.alloc_ctrs[0] =
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AFS_DIR_SLOTS_PER_BLOCK - AFS_DIR_RESV_BLOCKS0;
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}
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if (block_num < AFS_DIR_BLOCKS_WITH_CTR)
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meta->meta.alloc_ctrs[block_num] =
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AFS_DIR_SLOTS_PER_BLOCK - AFS_DIR_RESV_BLOCKS;
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}
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/*
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* Edit a directory's file data to add a new directory entry. Doing this after
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* create, mkdir, symlink, link or rename if the data version number is
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* incremented by exactly one avoids the need to re-download the entire
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* directory contents.
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*
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* The caller must hold the inode locked.
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*/
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void afs_edit_dir_add(struct afs_vnode *vnode,
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struct qstr *name, struct afs_fid *new_fid,
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enum afs_edit_dir_reason why)
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{
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union afs_xdr_dir_block *meta, *block;
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union afs_xdr_dirent *de;
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struct folio *folio0, *folio;
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unsigned int need_slots, nr_blocks, b;
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pgoff_t index;
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loff_t i_size;
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int slot;
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_enter(",,{%d,%s},", name->len, name->name);
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i_size = i_size_read(&vnode->netfs.inode);
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if (i_size > AFS_DIR_BLOCK_SIZE * AFS_DIR_MAX_BLOCKS ||
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(i_size & (AFS_DIR_BLOCK_SIZE - 1))) {
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clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
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return;
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}
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folio0 = afs_dir_get_folio(vnode, 0);
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if (!folio0) {
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_leave(" [fgp]");
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return;
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}
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/* Work out how many slots we're going to need. */
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need_slots = afs_dir_calc_slots(name->len);
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meta = kmap_local_folio(folio0, 0);
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if (i_size == 0)
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goto new_directory;
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nr_blocks = i_size / AFS_DIR_BLOCK_SIZE;
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/* Find a block that has sufficient slots available. Each folio
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* contains two or more directory blocks.
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*/
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for (b = 0; b < nr_blocks + 1; b++) {
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/* If the directory extended into a new folio, then we need to
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* tack a new folio on the end.
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*/
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index = b / AFS_DIR_BLOCKS_PER_PAGE;
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if (nr_blocks >= AFS_DIR_MAX_BLOCKS)
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goto error;
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if (index >= folio_nr_pages(folio0)) {
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folio = afs_dir_get_folio(vnode, index);
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if (!folio)
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goto error;
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} else {
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folio = folio0;
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}
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block = kmap_local_folio(folio, b * AFS_DIR_BLOCK_SIZE - folio_file_pos(folio));
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/* Abandon the edit if we got a callback break. */
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if (!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
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goto invalidated;
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_debug("block %u: %2u %3u %u",
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b,
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(b < AFS_DIR_BLOCKS_WITH_CTR) ? meta->meta.alloc_ctrs[b] : 99,
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ntohs(block->hdr.npages),
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ntohs(block->hdr.magic));
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/* Initialise the block if necessary. */
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if (b == nr_blocks) {
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_debug("init %u", b);
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afs_edit_init_block(meta, block, b);
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afs_set_i_size(vnode, (b + 1) * AFS_DIR_BLOCK_SIZE);
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}
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/* Only lower dir blocks have a counter in the header. */
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if (b >= AFS_DIR_BLOCKS_WITH_CTR ||
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meta->meta.alloc_ctrs[b] >= need_slots) {
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/* We need to try and find one or more consecutive
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* slots to hold the entry.
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*/
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slot = afs_find_contig_bits(block, need_slots);
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if (slot >= 0) {
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_debug("slot %u", slot);
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goto found_space;
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}
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}
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kunmap_local(block);
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if (folio != folio0) {
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folio_unlock(folio);
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folio_put(folio);
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}
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}
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/* There are no spare slots of sufficient size, yet the operation
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* succeeded. Download the directory again.
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*/
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trace_afs_edit_dir(vnode, why, afs_edit_dir_create_nospc, 0, 0, 0, 0, name->name);
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clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
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goto out_unmap;
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new_directory:
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afs_edit_init_block(meta, meta, 0);
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i_size = AFS_DIR_BLOCK_SIZE;
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afs_set_i_size(vnode, i_size);
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slot = AFS_DIR_RESV_BLOCKS0;
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folio = folio0;
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block = kmap_local_folio(folio, 0);
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nr_blocks = 1;
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b = 0;
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found_space:
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/* Set the dirent slot. */
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trace_afs_edit_dir(vnode, why, afs_edit_dir_create, b, slot,
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new_fid->vnode, new_fid->unique, name->name);
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de = &block->dirents[slot];
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de->u.valid = 1;
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de->u.unused[0] = 0;
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de->u.hash_next = 0; // TODO: Really need to maintain this
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de->u.vnode = htonl(new_fid->vnode);
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de->u.unique = htonl(new_fid->unique);
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memcpy(de->u.name, name->name, name->len + 1);
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de->u.name[name->len] = 0;
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/* Adjust the bitmap. */
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afs_set_contig_bits(block, slot, need_slots);
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kunmap_local(block);
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if (folio != folio0) {
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folio_unlock(folio);
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folio_put(folio);
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}
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/* Adjust the allocation counter. */
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if (b < AFS_DIR_BLOCKS_WITH_CTR)
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meta->meta.alloc_ctrs[b] -= need_slots;
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inode_inc_iversion_raw(&vnode->netfs.inode);
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afs_stat_v(vnode, n_dir_cr);
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_debug("Insert %s in %u[%u]", name->name, b, slot);
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out_unmap:
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kunmap_local(meta);
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folio_unlock(folio0);
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folio_put(folio0);
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_leave("");
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return;
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invalidated:
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||
|
|
trace_afs_edit_dir(vnode, why, afs_edit_dir_create_inval, 0, 0, 0, 0, name->name);
|
||
|
|
clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
|
||
|
|
kunmap_local(block);
|
||
|
|
if (folio != folio0) {
|
||
|
|
folio_unlock(folio);
|
||
|
|
folio_put(folio);
|
||
|
|
}
|
||
|
|
goto out_unmap;
|
||
|
|
|
||
|
|
error:
|
||
|
|
trace_afs_edit_dir(vnode, why, afs_edit_dir_create_error, 0, 0, 0, 0, name->name);
|
||
|
|
clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
|
||
|
|
goto out_unmap;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Edit a directory's file data to remove a new directory entry. Doing this
|
||
|
|
* after unlink, rmdir or rename if the data version number is incremented by
|
||
|
|
* exactly one avoids the need to re-download the entire directory contents.
|
||
|
|
*
|
||
|
|
* The caller must hold the inode locked.
|
||
|
|
*/
|
||
|
|
void afs_edit_dir_remove(struct afs_vnode *vnode,
|
||
|
|
struct qstr *name, enum afs_edit_dir_reason why)
|
||
|
|
{
|
||
|
|
union afs_xdr_dir_block *meta, *block;
|
||
|
|
union afs_xdr_dirent *de;
|
||
|
|
struct folio *folio0, *folio;
|
||
|
|
unsigned int need_slots, nr_blocks, b;
|
||
|
|
pgoff_t index;
|
||
|
|
loff_t i_size;
|
||
|
|
int slot;
|
||
|
|
|
||
|
|
_enter(",,{%d,%s},", name->len, name->name);
|
||
|
|
|
||
|
|
i_size = i_size_read(&vnode->netfs.inode);
|
||
|
|
if (i_size < AFS_DIR_BLOCK_SIZE ||
|
||
|
|
i_size > AFS_DIR_BLOCK_SIZE * AFS_DIR_MAX_BLOCKS ||
|
||
|
|
(i_size & (AFS_DIR_BLOCK_SIZE - 1))) {
|
||
|
|
clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
nr_blocks = i_size / AFS_DIR_BLOCK_SIZE;
|
||
|
|
|
||
|
|
folio0 = afs_dir_get_folio(vnode, 0);
|
||
|
|
if (!folio0) {
|
||
|
|
_leave(" [fgp]");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Work out how many slots we're going to discard. */
|
||
|
|
need_slots = afs_dir_calc_slots(name->len);
|
||
|
|
|
||
|
|
meta = kmap_local_folio(folio0, 0);
|
||
|
|
|
||
|
|
/* Find a block that has sufficient slots available. Each folio
|
||
|
|
* contains two or more directory blocks.
|
||
|
|
*/
|
||
|
|
for (b = 0; b < nr_blocks; b++) {
|
||
|
|
index = b / AFS_DIR_BLOCKS_PER_PAGE;
|
||
|
|
if (index >= folio_nr_pages(folio0)) {
|
||
|
|
folio = afs_dir_get_folio(vnode, index);
|
||
|
|
if (!folio)
|
||
|
|
goto error;
|
||
|
|
} else {
|
||
|
|
folio = folio0;
|
||
|
|
}
|
||
|
|
|
||
|
|
block = kmap_local_folio(folio, b * AFS_DIR_BLOCK_SIZE - folio_file_pos(folio));
|
||
|
|
|
||
|
|
/* Abandon the edit if we got a callback break. */
|
||
|
|
if (!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
|
||
|
|
goto invalidated;
|
||
|
|
|
||
|
|
if (b > AFS_DIR_BLOCKS_WITH_CTR ||
|
||
|
|
meta->meta.alloc_ctrs[b] <= AFS_DIR_SLOTS_PER_BLOCK - 1 - need_slots) {
|
||
|
|
slot = afs_dir_scan_block(block, name, b);
|
||
|
|
if (slot >= 0)
|
||
|
|
goto found_dirent;
|
||
|
|
}
|
||
|
|
|
||
|
|
kunmap_local(block);
|
||
|
|
if (folio != folio0) {
|
||
|
|
folio_unlock(folio);
|
||
|
|
folio_put(folio);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Didn't find the dirent to clobber. Download the directory again. */
|
||
|
|
trace_afs_edit_dir(vnode, why, afs_edit_dir_delete_noent,
|
||
|
|
0, 0, 0, 0, name->name);
|
||
|
|
clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
|
||
|
|
goto out_unmap;
|
||
|
|
|
||
|
|
found_dirent:
|
||
|
|
de = &block->dirents[slot];
|
||
|
|
|
||
|
|
trace_afs_edit_dir(vnode, why, afs_edit_dir_delete, b, slot,
|
||
|
|
ntohl(de->u.vnode), ntohl(de->u.unique),
|
||
|
|
name->name);
|
||
|
|
|
||
|
|
memset(de, 0, sizeof(*de) * need_slots);
|
||
|
|
|
||
|
|
/* Adjust the bitmap. */
|
||
|
|
afs_clear_contig_bits(block, slot, need_slots);
|
||
|
|
kunmap_local(block);
|
||
|
|
if (folio != folio0) {
|
||
|
|
folio_unlock(folio);
|
||
|
|
folio_put(folio);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Adjust the allocation counter. */
|
||
|
|
if (b < AFS_DIR_BLOCKS_WITH_CTR)
|
||
|
|
meta->meta.alloc_ctrs[b] += need_slots;
|
||
|
|
|
||
|
|
inode_set_iversion_raw(&vnode->netfs.inode, vnode->status.data_version);
|
||
|
|
afs_stat_v(vnode, n_dir_rm);
|
||
|
|
_debug("Remove %s from %u[%u]", name->name, b, slot);
|
||
|
|
|
||
|
|
out_unmap:
|
||
|
|
kunmap_local(meta);
|
||
|
|
folio_unlock(folio0);
|
||
|
|
folio_put(folio0);
|
||
|
|
_leave("");
|
||
|
|
return;
|
||
|
|
|
||
|
|
invalidated:
|
||
|
|
trace_afs_edit_dir(vnode, why, afs_edit_dir_delete_inval,
|
||
|
|
0, 0, 0, 0, name->name);
|
||
|
|
clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
|
||
|
|
kunmap_local(block);
|
||
|
|
if (folio != folio0) {
|
||
|
|
folio_unlock(folio);
|
||
|
|
folio_put(folio);
|
||
|
|
}
|
||
|
|
goto out_unmap;
|
||
|
|
|
||
|
|
error:
|
||
|
|
trace_afs_edit_dir(vnode, why, afs_edit_dir_delete_error,
|
||
|
|
0, 0, 0, 0, name->name);
|
||
|
|
clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
|
||
|
|
goto out_unmap;
|
||
|
|
}
|