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inode.c
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inode.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2018 Ernesto A. Fernández <[email protected]>
*/
#include <linux/slab.h>
#include <linux/buffer_head.h>
#include <linux/mount.h>
#include <linux/mpage.h>
#include <linux/blk_types.h>
#include "apfs.h"
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 19, 0)
#include <linux/sched/mm.h>
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 13, 0)
#include <linux/fileattr.h>
#endif
#define MAX_PFK_LEN 512
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 19, 0)
static int apfs_read_folio(struct file *file, struct folio *folio)
{
return mpage_read_folio(folio, apfs_get_block);
}
#else
static int apfs_readpage(struct file *file, struct page *page)
{
return mpage_readpage(page, apfs_get_block);
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0) /* Misses mpage_readpages() */
static void apfs_readahead(struct readahead_control *rac)
{
mpage_readahead(rac, apfs_get_block);
}
#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0) */
static int apfs_readpages(struct file *file, struct address_space *mapping,
struct list_head *pages, unsigned int nr_pages)
{
return mpage_readpages(mapping, pages, nr_pages, apfs_get_block);
}
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0) */
/**
* apfs_create_dstream_rec - Create a data stream record
* @dstream: data stream info
*
* Does nothing if the record already exists. TODO: support cloned files.
* Returns 0 on success or a negative error code in case of failure.
*/
static int apfs_create_dstream_rec(struct apfs_dstream_info *dstream)
{
struct super_block *sb = dstream->ds_sb;
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_query *query;
struct apfs_dstream_id_key raw_key;
struct apfs_dstream_id_val raw_val;
int ret;
query = apfs_alloc_query(sbi->s_cat_root, NULL /* parent */);
if (!query)
return -ENOMEM;
apfs_init_dstream_id_key(dstream->ds_id, &query->key);
query->flags |= APFS_QUERY_CAT | APFS_QUERY_EXACT;
ret = apfs_btree_query(sb, &query);
if (ret != -ENODATA) /* Either an error, or the record already exists */
goto out;
apfs_key_set_hdr(APFS_TYPE_DSTREAM_ID, dstream->ds_id, &raw_key);
raw_val.refcnt = cpu_to_le32(1);
ret = apfs_btree_insert(query, &raw_key, sizeof(raw_key), &raw_val, sizeof(raw_val));
if (ret) {
apfs_err(sb, "insertion failed for id 0x%llx", dstream->ds_id);
goto out;
}
out:
apfs_free_query(query);
return ret;
}
#define APFS_CREATE_DSTREAM_REC_MAXOPS 1
static int apfs_check_dstream_refcnt(struct inode *inode);
static int apfs_put_dstream_rec(struct apfs_dstream_info *dstream);
/**
* apfs_inode_create_exclusive_dstream - Make an inode's dstream not shared
* @inode: the vfs inode
*
* Returns 0 on success, or a negative error code in case of failure.
*/
int apfs_inode_create_exclusive_dstream(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct apfs_superblock *vsb_raw = APFS_SB(sb)->s_vsb_raw;
struct apfs_inode_info *ai = APFS_I(inode);
struct apfs_dstream_info *dstream = &ai->i_dstream;
u64 new_id;
int err;
if (!ai->i_has_dstream || !dstream->ds_shared)
return 0;
/*
* The ds_shared field is not updated when the other user of the
* dstream puts it, so it could be a false positive. Check it again
* before actually putting the dstream. The double query is wasteful,
* but I don't know if it makes sense to optimize this (TODO).
*/
err = apfs_check_dstream_refcnt(inode);
if (err) {
apfs_err(sb, "failed to check refcnt for ino 0x%llx", apfs_ino(inode));
return err;
}
if (!dstream->ds_shared)
return 0;
err = apfs_put_dstream_rec(dstream);
if (err) {
apfs_err(sb, "failed to put dstream for ino 0x%llx", apfs_ino(inode));
return err;
}
apfs_assert_in_transaction(sb, &vsb_raw->apfs_o);
new_id = le64_to_cpu(vsb_raw->apfs_next_obj_id);
le64_add_cpu(&vsb_raw->apfs_next_obj_id, 1);
err = apfs_clone_extents(dstream, new_id);
if (err) {
apfs_err(sb, "failed clone extents for ino 0x%llx", apfs_ino(inode));
return err;
}
dstream->ds_id = new_id;
err = apfs_create_dstream_rec(dstream);
if (err) {
apfs_err(sb, "failed to create dstream for ino 0x%llx", apfs_ino(inode));
return err;
}
dstream->ds_shared = false;
return 0;
}
/**
* apfs_inode_create_dstream_rec - Create the data stream record for an inode
* @inode: the vfs inode
*
* Does nothing if the record already exists. TODO: support cloned files.
* Returns 0 on success or a negative error code in case of failure.
*/
static int apfs_inode_create_dstream_rec(struct inode *inode)
{
struct apfs_inode_info *ai = APFS_I(inode);
int err;
if (ai->i_has_dstream)
return apfs_inode_create_exclusive_dstream(inode);
err = apfs_create_dstream_rec(&ai->i_dstream);
if (err)
return err;
ai->i_has_dstream = true;
return 0;
}
/**
* apfs_dstream_adj_refcnt - Adjust dstream record refcount
* @dstream: data stream info
* @delta: desired change in reference count
*
* Deletes the record if the reference count goes to zero. Returns 0 on success
* or a negative error code in case of failure.
*/
int apfs_dstream_adj_refcnt(struct apfs_dstream_info *dstream, u32 delta)
{
struct super_block *sb = dstream->ds_sb;
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_query *query;
struct apfs_dstream_id_val raw_val;
void *raw = NULL;
u32 refcnt;
int ret;
ASSERT(APFS_I(dstream->ds_inode)->i_has_dstream);
query = apfs_alloc_query(sbi->s_cat_root, NULL /* parent */);
if (!query)
return -ENOMEM;
apfs_init_dstream_id_key(dstream->ds_id, &query->key);
query->flags |= APFS_QUERY_CAT | APFS_QUERY_EXACT;
ret = apfs_btree_query(sb, &query);
if (ret) {
apfs_err(sb, "query failed for id 0x%llx", dstream->ds_id);
if (ret == -ENODATA)
ret = -EFSCORRUPTED;
goto out;
}
if (query->len != sizeof(raw_val)) {
apfs_err(sb, "bad value length (%d)", query->len);
ret = -EFSCORRUPTED;
goto out;
}
raw = query->node->object.data;
raw_val = *(struct apfs_dstream_id_val *)(raw + query->off);
refcnt = le32_to_cpu(raw_val.refcnt);
refcnt += delta;
if (refcnt == 0) {
ret = apfs_btree_remove(query);
if (ret)
apfs_err(sb, "removal failed for id 0x%llx", dstream->ds_id);
goto out;
}
raw_val.refcnt = cpu_to_le32(refcnt);
ret = apfs_btree_replace(query, NULL /* key */, 0 /* key_len */, &raw_val, sizeof(raw_val));
if (ret)
apfs_err(sb, "update failed for id 0x%llx", dstream->ds_id);
out:
apfs_free_query(query);
return ret;
}
/**
* apfs_put_dstream_rec - Put a reference for a data stream record
* @dstream: data stream info
*
* Deletes the record if the reference count goes to zero. Returns 0 on success
* or a negative error code in case of failure.
*/
static int apfs_put_dstream_rec(struct apfs_dstream_info *dstream)
{
struct apfs_inode_info *ai = APFS_I(dstream->ds_inode);
if (!ai->i_has_dstream)
return 0;
return apfs_dstream_adj_refcnt(dstream, -1);
}
/**
* apfs_create_crypto_rec - Create the crypto state record for an inode
* @inode: the vfs inode
*
* Does nothing if the record already exists. TODO: support cloned files.
* Returns 0 on success or a negative error code in case of failure.
*/
static int apfs_create_crypto_rec(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_dstream_info *dstream = &APFS_I(inode)->i_dstream;
struct apfs_query *query;
struct apfs_crypto_state_key raw_key;
int ret;
if (inode->i_size || inode->i_blocks) /* Already has a dstream */
return 0;
query = apfs_alloc_query(sbi->s_cat_root, NULL /* parent */);
if (!query)
return -ENOMEM;
apfs_init_crypto_state_key(dstream->ds_id, &query->key);
query->flags |= APFS_QUERY_CAT | APFS_QUERY_EXACT;
ret = apfs_btree_query(sb, &query);
if (ret != -ENODATA) /* Either an error, or the record already exists */
goto out;
apfs_key_set_hdr(APFS_TYPE_CRYPTO_STATE, dstream->ds_id, &raw_key);
if (sbi->s_dflt_pfk) {
struct apfs_crypto_state_val *raw_val = sbi->s_dflt_pfk;
unsigned int key_len = le16_to_cpu(raw_val->state.key_len);
ret = apfs_btree_insert(query, &raw_key, sizeof(raw_key), raw_val, sizeof(*raw_val) + key_len);
if (ret)
apfs_err(sb, "insertion failed for id 0x%llx", dstream->ds_id);
} else {
struct apfs_crypto_state_val raw_val;
raw_val.refcnt = cpu_to_le32(1);
raw_val.state.major_version = cpu_to_le16(APFS_WMCS_MAJOR_VERSION);
raw_val.state.minor_version = cpu_to_le16(APFS_WMCS_MINOR_VERSION);
raw_val.state.cpflags = 0;
raw_val.state.persistent_class = cpu_to_le32(APFS_PROTECTION_CLASS_F);
raw_val.state.key_os_version = 0;
raw_val.state.key_revision = cpu_to_le16(1);
raw_val.state.key_len = cpu_to_le16(0);
ret = apfs_btree_insert(query, &raw_key, sizeof(raw_key), &raw_val, sizeof(raw_val));
if (ret)
apfs_err(sb, "insertion failed for id 0x%llx", dstream->ds_id);
}
out:
apfs_free_query(query);
return ret;
}
#define APFS_CREATE_CRYPTO_REC_MAXOPS 1
/**
* apfs_dflt_key_class - Returns default key class for files in volume
* @sb: volume superblock
*/
static unsigned int apfs_dflt_key_class(struct super_block *sb)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
if (!sbi->s_dflt_pfk)
return APFS_PROTECTION_CLASS_F;
return le32_to_cpu(sbi->s_dflt_pfk->state.persistent_class);
}
/**
* apfs_create_crypto_rec - Adjust crypto state record refcount
* @sb: volume superblock
* @crypto_id: crypto_id to adjust
* @delta: desired change in reference count
*
* This function is used when adding or removing extents, as each extent holds
* a reference to the crypto ID. It should also be used when removing inodes,
* and in that case it should also remove the crypto record (TODO).
*/
int apfs_crypto_adj_refcnt(struct super_block *sb, u64 crypto_id, int delta)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_query *query;
struct apfs_crypto_state_val *raw_val;
char *raw;
int ret;
if (!crypto_id)
return 0;
query = apfs_alloc_query(sbi->s_cat_root, NULL /* parent */);
if (!query)
return -ENOMEM;
apfs_init_crypto_state_key(crypto_id, &query->key);
query->flags |= APFS_QUERY_CAT | APFS_QUERY_EXACT;
ret = apfs_btree_query(sb, &query);
if (ret) {
apfs_err(sb, "query failed for id 0x%llx", crypto_id);
goto out;
}
ret = apfs_query_join_transaction(query);
if (ret) {
apfs_err(sb, "query join failed");
return ret;
}
raw = query->node->object.data;
raw_val = (void *)raw + query->off;
le32_add_cpu(&raw_val->refcnt, delta);
out:
apfs_free_query(query);
return ret;
}
int APFS_CRYPTO_ADJ_REFCNT_MAXOPS(void)
{
return 1;
}
/**
* apfs_crypto_set_key - Modify content of crypto state record
* @sb: volume superblock
* @crypto_id: crypto_id to modify
* @new_val: new crypto state data; new_val->refcnt is overridden
*
* This function does not alter the inode's default protection class field.
* It needs to be done separately if the class changes.
*/
static int apfs_crypto_set_key(struct super_block *sb, u64 crypto_id, struct apfs_crypto_state_val *new_val)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_query *query;
struct apfs_crypto_state_val *raw_val;
char *raw;
int ret;
unsigned int pfk_len;
if (!crypto_id)
return 0;
pfk_len = le16_to_cpu(new_val->state.key_len);
query = apfs_alloc_query(sbi->s_cat_root, NULL /* parent */);
if (!query)
return -ENOMEM;
apfs_init_crypto_state_key(crypto_id, &query->key);
query->flags |= APFS_QUERY_CAT | APFS_QUERY_EXACT;
ret = apfs_btree_query(sb, &query);
if (ret) {
apfs_err(sb, "query failed for id 0x%llx", crypto_id);
goto out;
}
raw = query->node->object.data;
raw_val = (void *)raw + query->off;
new_val->refcnt = raw_val->refcnt;
ret = apfs_btree_replace(query, NULL /* key */, 0 /* key_len */, new_val, sizeof(*new_val) + pfk_len);
if (ret)
apfs_err(sb, "update failed for id 0x%llx", crypto_id);
out:
apfs_free_query(query);
return ret;
}
#define APFS_CRYPTO_SET_KEY_MAXOPS 1
/**
* apfs_crypto_get_key - Retrieve content of crypto state record
* @sb: volume superblock
* @crypto_id: crypto_id to modify
* @val: result crypto state data
* @max_len: maximum allowed value of val->state.key_len
*/
static int apfs_crypto_get_key(struct super_block *sb, u64 crypto_id, struct apfs_crypto_state_val *val,
unsigned int max_len)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_query *query;
struct apfs_crypto_state_val *raw_val;
char *raw;
int ret;
unsigned int pfk_len;
if (!crypto_id)
return -ENOENT;
query = apfs_alloc_query(sbi->s_cat_root, NULL /* parent */);
if (!query)
return -ENOMEM;
apfs_init_crypto_state_key(crypto_id, &query->key);
query->flags |= APFS_QUERY_CAT | APFS_QUERY_EXACT;
ret = apfs_btree_query(sb, &query);
if (ret)
goto out;
raw = query->node->object.data;
raw_val = (void *)raw + query->off;
pfk_len = le16_to_cpu(raw_val->state.key_len);
if (pfk_len > max_len) {
ret = -ENOSPC;
goto out;
}
memcpy(val, raw_val, sizeof(*val) + pfk_len);
out:
apfs_free_query(query);
return ret;
}
int __apfs_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned int len, unsigned int flags, struct page **pagep, void **fsdata)
{
struct inode *inode = mapping->host;
struct apfs_dstream_info *dstream = &APFS_I(inode)->i_dstream;
struct super_block *sb = inode->i_sb;
struct page *page;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 7, 0)
struct folio *folio;
#endif
struct buffer_head *bh, *head;
unsigned int blocksize, block_start, block_end, from, to;
pgoff_t index = pos >> PAGE_SHIFT;
sector_t iblock = (sector_t)index << (PAGE_SHIFT - inode->i_blkbits);
loff_t i_blks_end;
int err;
apfs_inode_join_transaction(sb, inode);
err = apfs_inode_create_dstream_rec(inode);
if (err) {
apfs_err(sb, "failed to create dstream for ino 0x%llx", apfs_ino(inode));
return err;
}
if (apfs_vol_is_encrypted(sb)) {
err = apfs_create_crypto_rec(inode);
if (err) {
apfs_err(sb, "crypto creation failed for ino 0x%llx", apfs_ino(inode));
return err;
}
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 19, 0)
flags = memalloc_nofs_save();
page = grab_cache_page_write_begin(mapping, index);
memalloc_nofs_restore(flags);
#else
page = grab_cache_page_write_begin(mapping, index, flags | AOP_FLAG_NOFS);
#endif
if (!page)
return -ENOMEM;
if (!page_has_buffers(page)) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 7, 0)
create_empty_buffers(page, sb->s_blocksize, 0);
#else
folio = page_folio(page);
bh = folio_buffers(folio);
if (!bh)
bh = create_empty_buffers(folio, sb->s_blocksize, 0);
#endif
}
/* CoW moves existing blocks, so read them but mark them as unmapped */
head = page_buffers(page);
blocksize = head->b_size;
i_blks_end = (inode->i_size + sb->s_blocksize - 1) >> inode->i_blkbits;
i_blks_end <<= inode->i_blkbits;
if (i_blks_end >= pos) {
from = pos & (PAGE_SIZE - 1);
to = from + min(i_blks_end - pos, (loff_t)len);
} else {
/* TODO: deal with preallocated tail blocks */
from = UINT_MAX;
to = 0;
}
for (bh = head, block_start = 0; bh != head || !block_start;
block_start = block_end, bh = bh->b_this_page, ++iblock) {
block_end = block_start + blocksize;
if (to > block_start && from < block_end) {
if (buffer_trans(bh))
continue;
if (!buffer_mapped(bh)) {
err = __apfs_get_block(dstream, iblock, bh,
false /* create */);
if (err) {
apfs_err(sb, "failed to map block for ino 0x%llx", apfs_ino(inode));
goto out_put_page;
}
}
if (buffer_mapped(bh) && !buffer_uptodate(bh)) {
get_bh(bh);
lock_buffer(bh);
bh->b_end_io = end_buffer_read_sync;
apfs_submit_bh(REQ_OP_READ, 0, bh);
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
apfs_err(sb, "failed to read block for ino 0x%llx", apfs_ino(inode));
err = -EIO;
goto out_put_page;
}
}
clear_buffer_mapped(bh);
}
}
err = __block_write_begin(page, pos, len, apfs_get_new_block);
if (err) {
apfs_err(sb, "CoW failed in inode 0x%llx", apfs_ino(inode));
goto out_put_page;
}
*pagep = page;
return 0;
out_put_page:
unlock_page(page);
put_page(page);
return err;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 19, 0)
static int apfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned int len,
struct page **pagep, void **fsdata)
#else
static int apfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned int len, unsigned int flags,
struct page **pagep, void **fsdata)
#endif
{
struct inode *inode = mapping->host;
struct super_block *sb = inode->i_sb;
int blkcount = (len + sb->s_blocksize - 1) >> inode->i_blkbits;
struct apfs_max_ops maxops;
int err;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 19, 0)
unsigned int flags = 0;
#endif
if (unlikely(pos >= APFS_MAX_FILE_SIZE))
return -EFBIG;
maxops.cat = APFS_CREATE_DSTREAM_REC_MAXOPS +
APFS_CREATE_CRYPTO_REC_MAXOPS +
APFS_UPDATE_INODE_MAXOPS() +
blkcount * APFS_GET_NEW_BLOCK_MAXOPS();
maxops.blks = blkcount;
err = apfs_transaction_start(sb, maxops);
if (err)
return err;
err = __apfs_write_begin(file, mapping, pos, len, flags, pagep, fsdata);
if (err)
goto fail;
return 0;
fail:
apfs_transaction_abort(sb);
return err;
}
int __apfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned int len, unsigned int copied, struct page *page, void *fsdata)
{
struct inode *inode = mapping->host;
struct apfs_dstream_info *dstream = &APFS_I(inode)->i_dstream;
int ret, err;
ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
dstream->ds_size = i_size_read(inode);
if (ret < len && pos + len > inode->i_size) {
truncate_pagecache(inode, inode->i_size);
err = apfs_truncate(dstream, inode->i_size);
if (err) {
apfs_err(inode->i_sb, "truncation failed for ino 0x%llx", apfs_ino(inode));
return err;
}
}
return ret;
}
static int apfs_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned int len, unsigned int copied,
struct page *page, void *fsdata)
{
struct inode *inode = mapping->host;
struct super_block *sb = inode->i_sb;
struct apfs_nx_transaction *trans = &APFS_NXI(sb)->nx_transaction;
int ret, err;
ret = __apfs_write_end(file, mapping, pos, len, copied, page, fsdata);
if (ret < 0) {
err = ret;
goto fail;
}
if ((pos + ret) & (sb->s_blocksize - 1))
trans->t_state |= APFS_NX_TRANS_INCOMPLETE_BLOCK;
else
trans->t_state &= ~APFS_NX_TRANS_INCOMPLETE_BLOCK;
err = apfs_transaction_commit(sb);
if (!err)
return ret;
fail:
apfs_transaction_abort(sb);
return err;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 18, 0)
static void apfs_noop_invalidatepage(struct page *page, unsigned int offset, unsigned int length)
#else
static void apfs_noop_invalidate_folio(struct folio *folio, size_t offset, size_t length)
#endif
{
}
/* bmap is not implemented to avoid issues with CoW on swapfiles */
static const struct address_space_operations apfs_aops = {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 18, 0)
.dirty_folio = block_dirty_folio,
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(5, 14, 0)
.set_page_dirty = __set_page_dirty_buffers,
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 19, 0)
.read_folio = apfs_read_folio,
#else
.readpage = apfs_readpage,
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0)
.readahead = apfs_readahead,
#else
.readpages = apfs_readpages,
#endif
.write_begin = apfs_write_begin,
.write_end = apfs_write_end,
/* The intention is to keep bhs around until the transaction is over */
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 18, 0)
.invalidatepage = apfs_noop_invalidatepage,
#else
.invalidate_folio = apfs_noop_invalidate_folio,
#endif
};
/**
* apfs_inode_set_ops - Set up an inode's operations
* @inode: vfs inode to set up
* @rdev: device id (0 if not a device file)
* @compressed: is this a compressed inode?
*
* For device files, also sets the device id to @rdev.
*/
static void apfs_inode_set_ops(struct inode *inode, dev_t rdev, bool compressed)
{
/* A lot of operations still missing, of course */
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
inode->i_op = &apfs_file_inode_operations;
if (compressed) {
inode->i_fop = &apfs_compress_file_operations;
inode->i_mapping->a_ops = &apfs_compress_aops;
} else {
inode->i_fop = &apfs_file_operations;
inode->i_mapping->a_ops = &apfs_aops;
}
break;
case S_IFDIR:
inode->i_op = &apfs_dir_inode_operations;
inode->i_fop = &apfs_dir_operations;
break;
case S_IFLNK:
inode->i_op = &apfs_symlink_inode_operations;
break;
default:
inode->i_op = &apfs_special_inode_operations;
init_special_inode(inode, inode->i_mode, rdev);
break;
}
}
/**
* apfs_inode_from_query - Read the inode found by a successful query
* @query: the query that found the record
* @inode: vfs inode to be filled with the read data
*
* Reads the inode record into @inode and performs some basic sanity checks,
* mostly as a protection against crafted filesystems. Returns 0 on success
* or a negative error code otherwise.
*/
static int apfs_inode_from_query(struct apfs_query *query, struct inode *inode)
{
struct apfs_inode_info *ai = APFS_I(inode);
struct apfs_dstream_info *dstream = &ai->i_dstream;
struct apfs_inode_val *inode_val;
char *raw = query->node->object.data;
char *xval = NULL;
int xlen;
u32 rdev = 0, bsd_flags;
bool compressed = false;
if (query->len < sizeof(*inode_val))
goto corrupted;
inode_val = (struct apfs_inode_val *)(raw + query->off);
ai->i_parent_id = le64_to_cpu(inode_val->parent_id);
dstream->ds_id = le64_to_cpu(inode_val->private_id);
inode->i_mode = le16_to_cpu(inode_val->mode);
ai->i_key_class = le32_to_cpu(inode_val->default_protection_class);
ai->i_int_flags = le64_to_cpu(inode_val->internal_flags);
ai->i_saved_uid = le32_to_cpu(inode_val->owner);
i_uid_write(inode, ai->i_saved_uid);
ai->i_saved_gid = le32_to_cpu(inode_val->group);
i_gid_write(inode, ai->i_saved_gid);
ai->i_bsd_flags = bsd_flags = le32_to_cpu(inode_val->bsd_flags);
if (bsd_flags & APFS_INOBSD_IMMUTABLE)
inode->i_flags |= S_IMMUTABLE;
if (bsd_flags & APFS_INOBSD_APPEND)
inode->i_flags |= S_APPEND;
if (!S_ISDIR(inode->i_mode)) {
/*
* Directory inodes don't store their link count, so to provide
* it we would have to actually count the subdirectories. The
* HFS/HFS+ modules just leave it at 1, and so do we, for now.
*/
set_nlink(inode, le32_to_cpu(inode_val->nlink));
} else {
ai->i_nchildren = le32_to_cpu(inode_val->nchildren);
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 6, 0)
inode->i_ctime = ns_to_timespec64(le64_to_cpu(inode_val->change_time));
#else
inode_set_ctime_to_ts(inode, ns_to_timespec64(le64_to_cpu(inode_val->change_time)));
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 7, 0)
inode->i_atime = ns_to_timespec64(le64_to_cpu(inode_val->access_time));
inode->i_mtime = ns_to_timespec64(le64_to_cpu(inode_val->mod_time));
#else
inode_set_atime_to_ts(inode, ns_to_timespec64(le64_to_cpu(inode_val->access_time)));
inode_set_mtime_to_ts(inode, ns_to_timespec64(le64_to_cpu(inode_val->mod_time)));
#endif
ai->i_crtime = ns_to_timespec64(le64_to_cpu(inode_val->create_time));
dstream->ds_size = inode->i_size = inode->i_blocks = 0;
ai->i_has_dstream = false;
if ((bsd_flags & APFS_INOBSD_COMPRESSED) && !S_ISDIR(inode->i_mode)) {
if (!apfs_compress_get_size(inode, &inode->i_size)) {
inode->i_blocks = (inode->i_size + 511) >> 9;
compressed = true;
}
} else {
xlen = apfs_find_xfield(inode_val->xfields,
query->len - sizeof(*inode_val),
APFS_INO_EXT_TYPE_DSTREAM, &xval);
if (xlen >= sizeof(struct apfs_dstream)) {
struct apfs_dstream *dstream_raw = (struct apfs_dstream *)xval;
dstream->ds_size = inode->i_size = le64_to_cpu(dstream_raw->size);
inode->i_blocks = le64_to_cpu(dstream_raw->alloced_size) >> 9;
ai->i_has_dstream = true;
}
}
xval = NULL;
/* TODO: move each xfield read to its own function */
dstream->ds_sparse_bytes = 0;
xlen = apfs_find_xfield(inode_val->xfields, query->len - sizeof(*inode_val), APFS_INO_EXT_TYPE_SPARSE_BYTES, &xval);
if (xlen >= sizeof(__le64)) {
__le64 *sparse_bytes_p = (__le64 *)xval;
dstream->ds_sparse_bytes = le64_to_cpup(sparse_bytes_p);
}
xval = NULL;
rdev = 0;
xlen = apfs_find_xfield(inode_val->xfields,
query->len - sizeof(*inode_val),
APFS_INO_EXT_TYPE_RDEV, &xval);
if (xlen >= sizeof(__le32)) {
__le32 *rdev_p = (__le32 *)xval;
rdev = le32_to_cpup(rdev_p);
}
apfs_inode_set_ops(inode, rdev, compressed);
return 0;
corrupted:
apfs_err(inode->i_sb, "bad inode record for inode 0x%llx", apfs_ino(inode));
return -EFSCORRUPTED;
}
/**
* apfs_inode_lookup - Lookup an inode record in the catalog b-tree
* @inode: vfs inode to lookup
*
* Runs a catalog query for the apfs_ino(@inode) inode record; returns a pointer
* to the query structure on success, or an error pointer in case of failure.
*/
static struct apfs_query *apfs_inode_lookup(const struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_query *query;
int ret;
query = apfs_alloc_query(sbi->s_cat_root, NULL /* parent */);
if (!query)
return ERR_PTR(-ENOMEM);
apfs_init_inode_key(apfs_ino(inode), &query->key);
query->flags |= APFS_QUERY_CAT | APFS_QUERY_EXACT;
ret = apfs_btree_query(sb, &query);
if (!ret)
return query;
/* Don't complain if an orphan is already gone */
if (!current_work() || ret != -ENODATA)
apfs_err(sb, "query failed for id 0x%llx", apfs_ino(inode));
apfs_free_query(query);
return ERR_PTR(ret);
}
/**
* apfs_test_inode - Check if the inode matches a 64-bit inode number
* @inode: inode to test
* @cnid: pointer to the inode number
*/
static int apfs_test_inode(struct inode *inode, void *cnid)
{
u64 *ino = cnid;
return apfs_ino(inode) == *ino;
}
/**
* apfs_set_inode - Set a 64-bit inode number on the given inode
* @inode: inode to set
* @cnid: pointer to the inode number
*/
static int apfs_set_inode(struct inode *inode, void *cnid)
{
apfs_set_ino(inode, *(u64 *)cnid);
return 0;
}
/**
* apfs_iget_locked - Wrapper for iget5_locked()
* @sb: filesystem superblock
* @cnid: 64-bit inode number
*
* Works the same as iget_locked(), but can handle 64-bit inode numbers on
* 32-bit architectures.
*/
static struct inode *apfs_iget_locked(struct super_block *sb, u64 cnid)
{
return iget5_locked(sb, cnid, apfs_test_inode, apfs_set_inode, &cnid);
}
/**
* apfs_check_dstream_refcnt - Check if an inode's dstream is shared
* @inode: the inode to check
*
* Sets the value of ds_shared for the inode's dstream. Returns 0 on success,
* or a negative error code in case of failure.
*/
static int apfs_check_dstream_refcnt(struct inode *inode)
{
struct apfs_inode_info *ai = APFS_I(inode);
struct apfs_dstream_info *dstream = &ai->i_dstream;
struct super_block *sb = inode->i_sb;
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_query *query = NULL;
struct apfs_dstream_id_val raw_val;
void *raw = NULL;
u32 refcnt;
int ret;
if (!ai->i_has_dstream) {
dstream->ds_shared = false;
return 0;
}
query = apfs_alloc_query(sbi->s_cat_root, NULL /* parent */);
if (!query)
return -ENOMEM;
apfs_init_dstream_id_key(dstream->ds_id, &query->key);
query->flags |= APFS_QUERY_CAT | APFS_QUERY_EXACT;
ret = apfs_btree_query(sb, &query);
if (ret) {
apfs_err(sb, "query failed for id 0x%llx", dstream->ds_id);
if (ret == -ENODATA)
ret = -EFSCORRUPTED;
goto fail;
}
if (query->len != sizeof(raw_val)) {
ret = -EFSCORRUPTED;
goto fail;
}
raw = query->node->object.data;
raw_val = *(struct apfs_dstream_id_val *)(raw + query->off);
refcnt = le32_to_cpu(raw_val.refcnt);
dstream->ds_shared = refcnt > 1;
fail:
apfs_free_query(query);
return ret;
}
/**
* apfs_iget - Populate inode structures with metadata from disk
* @sb: filesystem superblock
* @cnid: inode number
*
* Populates the vfs inode and the corresponding apfs_inode_info structure.
* Returns a pointer to the vfs inode in case of success, or an appropriate
* error pointer otherwise.
*/
struct inode *apfs_iget(struct super_block *sb, u64 cnid)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_nxsb_info *nxi = APFS_NXI(sb);
struct inode *inode;
struct apfs_query *query;
int err;