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linux-apfs-rw/super.c
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Ernesto A. Fernández 7aca589f9e Use ->parse_param(), not ->parse_monolithic() 
SergDL reports that mounts seem broken for the 7.0 kernel:

  https://github.com/linux-apfs/linux-apfs-rw/issues/119

I never encountered this problem during testing, probably because my
version of the mount tool is older. It seems that mount options are now
set one by one using the fsconfig() syscall, and that's not possible if
we parse them all at once with ->parse_monolithic().

Implement ->parse_param() instead, at least for the latest kernel. I do
wonder if this issue won't pop up with older kernels though, since the
fsconfig() syscall has been around since 5.2. I guess I'll wait to see
if somebody complains about it.

Signed-off-by: Ernesto A. Fernández <ernesto@corellium.com>
2026-04-24 17:10:07 -03:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2018 Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
*/
#include <linux/backing-dev.h>
#include <linux/blkdev.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/magic.h>
#include <linux/slab.h>
#include <linux/parser.h>
#include <linux/buffer_head.h>
#include <linux/statfs.h>
#include <linux/seq_file.h>
#include "apfs.h"
#include "version.h"
#if LINUX_VERSION_CODE >= KERNEL_VERSION(7, 0, 0)
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#endif
#define APFS_MODULE_ID_STRING "linux-apfs by eafer (" GIT_COMMIT ")"
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0) /* iversion came in 4.16 */
#include <linux/iversion.h>
#endif
/* Keep a list of mounted containers, so that their volumes can share them */
static LIST_HEAD(nxs);
/*
* The main purpose of this mutex is to protect the list of containers and
* their reference counts, but it also has other uses during mounts/unmounts:
* - it prevents new mounts from starting while an unmount is updating the
* backup superblock (apfs_attach_nxi vs apfs_make_super_copy)
* - it prevents a new container superblock read from starting while another
* is taking place, which could cause leaks and other issues if both
* containers are the same (apfs_read_main_super vs itself)
* - it protects the list of volumes for each container, and keeps it
* consistent with the reference count
* - it prevents two different snapshots for a single volume from trying to
* do the first read of their shared omap at the same time
* (apfs_first_read_omap vs itself)
* - it protects the reference count for that shared omap, keeping it
* consistent with the number of volumes that are set with that omap
* - it protects the container mount flags, so that they can only be set by
* the first volume mount to attempt it (apfs_set_nx_flags vs itself)
*/
DEFINE_MUTEX(nxs_mutex);
/**
* apfs_nx_find_by_dev - Search for a device in the list of mounted containers
* @dev: device number of block device for the wanted container
*
* Returns a pointer to the container structure in the list, or NULL if the
* container isn't currently mounted.
*/
static struct apfs_nxsb_info *apfs_nx_find_by_dev(dev_t dev)
{
struct apfs_nxsb_info *curr;
lockdep_assert_held(&nxs_mutex);
list_for_each_entry(curr, &nxs, nx_list) {
struct block_device *curr_bdev = curr->nx_blkdev_info->blki_bdev;
if (curr_bdev->bd_dev == dev)
return curr;
}
return NULL;
}
/**
* apfs_blkdev_set_blocksize - Set the blocksize for a block device
* @info: info struct for the block device
* @size: size to set
*
* Returns 0 on success, or a negative error code in case of failure.
*/
static int apfs_blkdev_set_blocksize(struct apfs_blkdev_info *info, int size)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 10, 0)
return set_blocksize(info->blki_bdev_file, size);
#else
return set_blocksize(info->blki_bdev, size);
#endif
}
/**
* apfs_sb_set_blocksize - Set the block size for the container's device
* @sb: superblock structure
* @size: size to set
*
* This is like sb_set_blocksize(), but it uses the container's device instead
* of the nonexistent volume device.
*/
static int apfs_sb_set_blocksize(struct super_block *sb, int size)
{
if (apfs_blkdev_set_blocksize(APFS_NXI(sb)->nx_blkdev_info, size))
return 0;
sb->s_blocksize = size;
sb->s_blocksize_bits = blksize_bits(size);
return sb->s_blocksize;
}
/**
* apfs_read_super_copy - Read the copy of the container superblock in block 0
* @sb: superblock structure
*
* Returns a pointer to the buffer head, or an error pointer in case of failure.
*/
static struct buffer_head *apfs_read_super_copy(struct super_block *sb)
{
struct buffer_head *bh;
struct apfs_nx_superblock *msb_raw;
int blocksize;
int err = -EINVAL;
/*
* For now assume a small blocksize, we only need it so that we can
* read the actual blocksize from disk.
*/
if (!apfs_sb_set_blocksize(sb, APFS_NX_DEFAULT_BLOCK_SIZE)) {
apfs_err(sb, "unable to set blocksize");
return ERR_PTR(err);
}
bh = apfs_sb_bread(sb, APFS_NX_BLOCK_NUM);
if (!bh) {
apfs_err(sb, "unable to read superblock");
return ERR_PTR(err);
}
msb_raw = (struct apfs_nx_superblock *)bh->b_data;
blocksize = le32_to_cpu(msb_raw->nx_block_size);
sb->s_magic = le32_to_cpu(msb_raw->nx_magic);
if (sb->s_magic != APFS_NX_MAGIC) {
apfs_warn(sb, "not an apfs container - are you mounting the right partition?");
goto fail;
}
if (sb->s_blocksize != blocksize) {
brelse(bh);
if (!apfs_sb_set_blocksize(sb, blocksize)) {
apfs_err(sb, "bad blocksize %d", blocksize);
return ERR_PTR(err);
}
bh = apfs_sb_bread(sb, APFS_NX_BLOCK_NUM);
if (!bh) {
apfs_err(sb, "unable to read superblock 2nd time");
return ERR_PTR(err);
}
msb_raw = (struct apfs_nx_superblock *)bh->b_data;
}
if (!apfs_obj_verify_csum(sb, bh))
apfs_notice(sb, "backup superblock seems corrupted");
return bh;
fail:
brelse(bh);
return ERR_PTR(err);
}
/**
* apfs_make_super_copy - Write a copy of the checkpoint superblock to block 0
* @sb: superblock structure
*/
static void apfs_make_super_copy(struct super_block *sb)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_nxsb_info *nxi = sbi->s_nxi;
struct buffer_head *bh;
if (!(nxi->nx_flags & APFS_READWRITE))
return;
/*
* Only update the backup when the last volume is getting unmounted.
* Of course a new mounter could still come along before we actually
* release the nxi.
*/
mutex_lock(&nxs_mutex);
if (nxi->nx_refcnt > 1)
goto out_unlock;
bh = apfs_sb_bread(sb, APFS_NX_BLOCK_NUM);
if (!bh) {
apfs_err(sb, "failed to write block zero");
goto out_unlock;
}
memcpy(bh->b_data, nxi->nx_raw, sb->s_blocksize);
mark_buffer_dirty(bh);
brelse(bh);
out_unlock:
mutex_unlock(&nxs_mutex);
}
static int apfs_check_nx_features(struct super_block *sb);
static void apfs_set_trans_buffer_limit(struct super_block *sb);
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 7, 0)
static inline void import_uuid(uuid_t *dst, const __u8 *src)
{
memcpy(dst, src, sizeof(uuid_t));
}
#endif
/**
* apfs_check_fusion_uuid - Verify that the main and tier 2 devices match
* @sb: filesystem superblock
*
* Returns 0 on success, or a negative error code in case of failure.
*/
static int apfs_check_fusion_uuid(struct super_block *sb)
{
struct apfs_nxsb_info *nxi = NULL;
struct apfs_nx_superblock *main_raw = NULL, *tier2_raw = NULL;
uuid_t main_uuid, tier2_uuid;
struct buffer_head *bh = NULL;
nxi = APFS_NXI(sb);
main_raw = nxi->nx_raw;
if (!main_raw) {
apfs_alert(sb, "fusion uuid checks are misplaced");
return -EINVAL;
}
import_uuid(&main_uuid, main_raw->nx_fusion_uuid);
main_raw = NULL;
if (!nxi->nx_tier2_info) {
/* Not a fusion drive */
if (!uuid_is_null(&main_uuid)) {
apfs_err(sb, "fusion uuid on a regular drive");
return -EFSCORRUPTED;
}
return 0;
}
if (uuid_is_null(&main_uuid)) {
apfs_err(sb, "no fusion uuid on fusion drive");
return -EFSCORRUPTED;
}
/* Tier 2 also has a copy of the superblock in block zero */
bh = apfs_sb_bread(sb, nxi->nx_tier2_bno);
if (IS_ERR(bh))
return PTR_ERR(bh);
tier2_raw = (struct apfs_nx_superblock *)bh->b_data;
import_uuid(&tier2_uuid, tier2_raw->nx_fusion_uuid);
brelse(bh);
bh = NULL;
tier2_raw = NULL;
/*
* The only difference between both superblocks (other than the
* checksum) is this one bit here, so it can be used to tell which is
* main and which is tier 2. By the way, the reference seems to have
* this backwards.
*/
if (main_uuid.b[15] & 0x01) {
apfs_warn(sb, "bad bit on main device - are you mixing up main and tier 2?");
return -EINVAL;
}
if (!(tier2_uuid.b[15] & 0x01)) {
apfs_warn(sb, "bad bit on tier 2 device - are you mixing up main and tier 2?");
return -EINVAL;
}
tier2_uuid.b[15] &= ~0x01;
if (!uuid_equal(&main_uuid, &tier2_uuid)) {
apfs_warn(sb, "the devices are not part of the same fusion drive");
return -EINVAL;
}
return 0;
}
/**
* apfs_read_main_super - Find the container superblock and read it into memory
* @sb: superblock structure
*
* Returns a negative error code in case of failure. On success, returns 0
* and sets the nx_raw and nx_xid fields of APFS_NXI(@sb).
*/
static int apfs_read_main_super(struct super_block *sb)
{
struct apfs_nxsb_info *nxi = APFS_NXI(sb);
struct buffer_head *bh = NULL;
struct buffer_head *desc_bh = NULL;
struct apfs_nx_superblock *msb_raw;
u64 xid, bno = APFS_NX_BLOCK_NUM;
u64 desc_base;
u32 desc_blocks;
int err = -EINVAL;
int i;
mutex_lock(&nxs_mutex);
if (nxi->nx_blocksize) {
/* It's already mapped */
sb->s_blocksize = nxi->nx_blocksize;
sb->s_blocksize_bits = nxi->nx_blocksize_bits;
sb->s_magic = le32_to_cpu(nxi->nx_raw->nx_magic);
err = 0;
goto out;
}
/*
* We won't know the block size until we read the backup superblock,
* so we can't set this up correctly yet. But we do know that the
* backup superblock itself is always in the main device.
*/
nxi->nx_tier2_bno = APFS_NX_BLOCK_NUM + 1;
/* Read the superblock from the last clean unmount */
bh = apfs_read_super_copy(sb);
if (IS_ERR(bh)) {
err = PTR_ERR(bh);
bh = NULL;
goto out;
}
msb_raw = (struct apfs_nx_superblock *)bh->b_data;
/*
* Now that we confirmed the block size, we can set this up for real.
* It's important to do this early because I don't know which mount
* objects could get moved to tier 2.
*/
nxi->nx_tier2_bno = APFS_FUSION_TIER2_DEVICE_BYTE_ADDR >> sb->s_blocksize_bits;
/* We want to mount the latest valid checkpoint among the descriptors */
desc_base = le64_to_cpu(msb_raw->nx_xp_desc_base);
if (desc_base >> 63 != 0) {
/* The highest bit is set when checkpoints are not contiguous */
apfs_err(sb, "checkpoint descriptor tree not yet supported");
goto out;
}
desc_blocks = le32_to_cpu(msb_raw->nx_xp_desc_blocks);
if (desc_blocks > 10000) { /* Arbitrary loop limit, is it enough? */
apfs_err(sb, "too many checkpoint descriptors?");
err = -EFSCORRUPTED;
goto out;
}
/* Now we go through the checkpoints one by one */
xid = le64_to_cpu(msb_raw->nx_o.o_xid);
for (i = 0; i < desc_blocks; ++i) {
struct apfs_nx_superblock *desc_raw;
brelse(desc_bh);
desc_bh = apfs_sb_bread(sb, desc_base + i);
if (!desc_bh) {
apfs_err(sb, "unable to read checkpoint descriptor");
goto out;
}
desc_raw = (struct apfs_nx_superblock *)desc_bh->b_data;
if (le32_to_cpu(desc_raw->nx_magic) != APFS_NX_MAGIC)
continue; /* Not a superblock */
if (le64_to_cpu(desc_raw->nx_o.o_xid) <= xid)
continue; /* Old */
if (!apfs_obj_verify_csum(sb, desc_bh))
continue; /* Corrupted */
xid = le64_to_cpu(desc_raw->nx_o.o_xid);
msb_raw = desc_raw;
bno = desc_base + i;
brelse(bh);
bh = desc_bh;
desc_bh = NULL;
}
nxi->nx_raw = kmalloc(sb->s_blocksize, GFP_KERNEL);
if (!nxi->nx_raw) {
err = -ENOMEM;
goto out;
}
memcpy(nxi->nx_raw, bh->b_data, sb->s_blocksize);
nxi->nx_bno = bno;
nxi->nx_xid = xid;
/* For now we only support blocksize < PAGE_SIZE */
nxi->nx_blocksize = sb->s_blocksize;
nxi->nx_blocksize_bits = sb->s_blocksize_bits;
apfs_set_trans_buffer_limit(sb);
err = apfs_check_nx_features(sb);
if (err)
goto out;
/*
* This check is technically too late: if main and tier 2 are backwards
* then we have already attempted (and failed) to read the checkpoint
* from tier 2. This may lead to a confusing error message if tier 2
* is absurdly tiny, not a big deal.
*/
err = apfs_check_fusion_uuid(sb);
if (err)
goto out;
out:
brelse(bh);
mutex_unlock(&nxs_mutex);
return err;
}
/**
* apfs_update_software_info - Write the module info to a modified volume
* @sb: superblock structure
*
* Writes this module's information to index zero of the apfs_modified_by
* array, shifting the rest of the entries to the right.
*/
static void apfs_update_software_info(struct super_block *sb)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_superblock *raw = sbi->s_vsb_raw;
struct apfs_modified_by *mod_by;
ASSERT(sbi->s_vsb_raw);
apfs_assert_in_transaction(sb, &raw->apfs_o);
ASSERT(strlen(APFS_MODULE_ID_STRING) < APFS_MODIFIED_NAMELEN);
mod_by = raw->apfs_modified_by;
memmove(mod_by + 1, mod_by, (APFS_MAX_HIST - 1) * sizeof(*mod_by));
memset(mod_by->id, 0, sizeof(mod_by->id));
strscpy(mod_by->id, APFS_MODULE_ID_STRING, sizeof(mod_by->id));
mod_by->timestamp = cpu_to_le64(ktime_get_real_ns());
mod_by->last_xid = cpu_to_le64(APFS_NXI(sb)->nx_xid);
}
static struct file_system_type apfs_fs_type;
/**
* apfs_blkdev_cleanup - Clean up after a block device
* @info: info struct to clean up
*/
static void apfs_blkdev_cleanup(struct apfs_blkdev_info *info)
{
if (!info)
return;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 9, 0) || RHEL_VERSION_GE(9, 5)
fput(info->blki_bdev_file);
info->blki_bdev_file = NULL;
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(6, 8, 0)
bdev_release(info->blki_bdev_handle);
info->blki_bdev_handle = NULL;
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(6, 5, 0) || RHEL_VERSION_GE(9, 4)
blkdev_put(info->blki_bdev, &apfs_fs_type);
#else
blkdev_put(info->blki_bdev, info->blki_mode);
#endif
info->blki_bdev = NULL;
kfree(info->blki_path);
info->blki_path = NULL;
kfree(info);
}
/**
* apfs_free_main_super - Clean up apfs_read_main_super()
* @sbi: in-memory superblock info
*
* It also cleans up after apfs_attach_nxi(), so the name is no longer accurate.
*/
static inline void apfs_free_main_super(struct apfs_sb_info *sbi)
{
struct apfs_nxsb_info *nxi = sbi->s_nxi;
struct apfs_ephemeral_object_info *eph_list = NULL;
struct apfs_spaceman *sm = NULL;
u32 bmap_idx;
int i;
if (!nxi)
return;
mutex_lock(&nxs_mutex);
list_del(&sbi->list);
if (--nxi->nx_refcnt)
goto out;
/* Clean up all the ephemeral objects in memory */
eph_list = nxi->nx_eph_list;
if (eph_list) {
for (i = 0; i < nxi->nx_eph_count; ++i) {
kfree(eph_list[i].object);
eph_list[i].object = NULL;
}
kfree(eph_list);
eph_list = nxi->nx_eph_list = NULL;
nxi->nx_eph_count = 0;
}
kfree(nxi->nx_raw);
nxi->nx_raw = NULL;
apfs_blkdev_cleanup(nxi->nx_blkdev_info);
nxi->nx_blkdev_info = NULL;
apfs_blkdev_cleanup(nxi->nx_tier2_info);
nxi->nx_tier2_info = NULL;
list_del(&nxi->nx_list);
sm = nxi->nx_spaceman;
if (sm) {
for (bmap_idx = 0; bmap_idx < sm->sm_ip_bmaps_count; ++bmap_idx) {
kfree(sm->sm_ip_bmaps[bmap_idx].block);
sm->sm_ip_bmaps[bmap_idx].block = NULL;
}
kfree(sm);
nxi->nx_spaceman = sm = NULL;
}
kfree(nxi);
out:
sbi->s_nxi = NULL;
mutex_unlock(&nxs_mutex);
}
/**
* apfs_map_volume_super_bno - Map a block containing a volume superblock
* @sb: superblock structure
* @bno: block to map
* @check: verify the checksum?
*/
int apfs_map_volume_super_bno(struct super_block *sb, u64 bno, bool check)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_superblock *vsb_raw = NULL;
struct buffer_head *bh = NULL;
int err;
bh = apfs_sb_bread(sb, bno);
if (!bh) {
apfs_err(sb, "unable to read volume superblock");
return -EINVAL;
}
vsb_raw = (struct apfs_superblock *)bh->b_data;
if (le32_to_cpu(vsb_raw->apfs_magic) != APFS_MAGIC) {
apfs_err(sb, "wrong magic in volume superblock");
err = -EINVAL;
goto fail;
}
/*
* XXX: apfs_omap_lookup_block() only runs this check when write
* is true, but it should always do it.
*/
if (check && !apfs_obj_verify_csum(sb, bh)) {
apfs_err(sb, "inconsistent volume superblock");
err = -EFSBADCRC;
goto fail;
}
sbi->s_vsb_raw = vsb_raw;
sbi->s_vobject.sb = sb;
sbi->s_vobject.block_nr = bno;
sbi->s_vobject.oid = le64_to_cpu(vsb_raw->apfs_o.o_oid);
brelse(sbi->s_vobject.o_bh);
sbi->s_vobject.o_bh = bh;
sbi->s_vobject.data = bh->b_data;
return 0;
fail:
brelse(bh);
return err;
}
/**
* apfs_alloc_omap - Allocate and initialize an object map struct
*
* Returns the struct, or NULL in case of allocation failure.
*/
static struct apfs_omap *apfs_alloc_omap(void)
{
struct apfs_omap *omap = NULL;
struct apfs_omap_cache *cache = NULL;
omap = kzalloc(sizeof(*omap), GFP_KERNEL);
if (!omap)
return NULL;
cache = &omap->omap_cache;
spin_lock_init(&cache->lock);
return omap;
}
/**
* apfs_map_volume_super - Find the volume superblock and map it into memory
* @sb: superblock structure
* @write: request write access?
*
* Returns a negative error code in case of failure. On success, returns 0
* and sets APFS_SB(@sb)->s_vsb_raw and APFS_SB(@sb)->s_vobject.
*/
int apfs_map_volume_super(struct super_block *sb, bool write)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_nxsb_info *nxi = APFS_NXI(sb);
struct apfs_nx_superblock *msb_raw = nxi->nx_raw;
struct apfs_omap_phys *msb_omap_raw;
struct apfs_omap *omap = NULL;
struct apfs_node *vnode;
struct buffer_head *bh;
u64 vol_id;
u64 vsb;
int err;
ASSERT(msb_raw);
/* Get the id for the requested volume number */
if (sbi->s_vol_nr >= APFS_NX_MAX_FILE_SYSTEMS) {
apfs_err(sb, "volume number out of range");
return -EINVAL;
}
vol_id = le64_to_cpu(msb_raw->nx_fs_oid[sbi->s_vol_nr]);
if (vol_id == 0) {
apfs_err(sb, "requested volume does not exist");
return -EINVAL;
}
/* Get the container's object map */
bh = apfs_read_object_block(sb, le64_to_cpu(msb_raw->nx_omap_oid),
write, false /* preserve */);
if (IS_ERR(bh)) {
apfs_err(sb, "unable to read container object map");
return PTR_ERR(bh);
}
if (write) {
ASSERT(buffer_trans(bh));
msb_raw->nx_omap_oid = cpu_to_le64(bh->b_blocknr);
}
msb_omap_raw = (struct apfs_omap_phys *)bh->b_data;
/* Get the root node for the container's omap */
vnode = apfs_read_node(sb, le64_to_cpu(msb_omap_raw->om_tree_oid),
APFS_OBJ_PHYSICAL, write);
if (IS_ERR(vnode)) {
apfs_err(sb, "unable to read volume block");
err = PTR_ERR(vnode);
goto fail;
}
if (write) {
ASSERT(buffer_trans(bh));
msb_omap_raw->om_tree_oid = cpu_to_le64(vnode->object.block_nr);
}
msb_omap_raw = NULL;
brelse(bh);
bh = NULL;
omap = apfs_alloc_omap();
if (!omap) {
apfs_node_free(vnode);
return -ENOMEM;
}
omap->omap_root = vnode;
err = apfs_omap_lookup_block(sb, omap, vol_id, &vsb, write);
apfs_node_free(vnode);
vnode = NULL;
kfree(omap);
omap = NULL;
if (err) {
apfs_err(sb, "volume not found, likely corruption");
return err;
}
/*
* Snapshots could get mounted during a transaction, so the fletcher
* checksum doesn't have to be valid.
*/
return apfs_map_volume_super_bno(sb, vsb, !write && !sbi->s_snap_name);
fail:
brelse(bh);
return err;
}
/**
* apfs_unmap_volume_super - Clean up apfs_map_volume_super()
* @sb: filesystem superblock
*/
void apfs_unmap_volume_super(struct super_block *sb)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_object *obj = &sbi->s_vobject;
obj->data = NULL;
brelse(obj->o_bh);
obj->o_bh = NULL;
}
/**
* apfs_get_omap - Get a reference to the omap, if it's already read
* @sb: filesystem superblock
*
* Returns the omap struct, or NULL on failure.
*/
static struct apfs_omap *apfs_get_omap(struct super_block *sb)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_nxsb_info *nxi = APFS_NXI(sb);
struct apfs_sb_info *curr = NULL;
struct apfs_omap *omap = NULL;
struct apfs_omap_cache *cache = NULL;
lockdep_assert_held(&nxs_mutex);
list_for_each_entry(curr, &nxi->vol_list, list) {
if (curr == sbi)
continue;
if (curr->s_vol_nr == sbi->s_vol_nr) {
omap = curr->s_omap;
if (!omap) {
/*
* This volume has already gone through
* apfs_attach_nxi(), but its omap is either
* not yet read or already put.
*/
continue;
}
cache = &omap->omap_cache;
++omap->omap_refcnt;
/* Right now the cache can't be shared like this */
cache->disabled = true;
return omap;
}
}
return NULL;
}
/**
* apfs_read_omap - Find and read the omap root node
* @sb: superblock structure
* @write: request write access?
*
* On success, returns 0 and sets the fields of APFS_SB(@sb)->s_omap; on failure
* returns a negative error code.
*/
int apfs_read_omap(struct super_block *sb, bool write)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_superblock *vsb_raw = sbi->s_vsb_raw;
struct apfs_omap_phys *omap_raw;
struct apfs_node *omap_root;
struct apfs_omap *omap = NULL;
struct buffer_head *bh;
u64 omap_blk;
int err;
ASSERT(sbi->s_vsb_raw);
ASSERT(sbi->s_omap);
omap = sbi->s_omap;
/* Get the block holding the volume omap information */
omap_blk = le64_to_cpu(vsb_raw->apfs_omap_oid);
bh = apfs_read_object_block(sb, omap_blk, write, false /* preserve */);
if (IS_ERR(bh)) {
apfs_err(sb, "unable to read the volume object map");
return PTR_ERR(bh);
}
if (write) {
apfs_assert_in_transaction(sb, &vsb_raw->apfs_o);
vsb_raw->apfs_omap_oid = cpu_to_le64(bh->b_blocknr);
}
omap_raw = (struct apfs_omap_phys *)bh->b_data;
/* Get the volume's object map */
omap_root = apfs_read_node(sb, le64_to_cpu(omap_raw->om_tree_oid),
APFS_OBJ_PHYSICAL, write);
if (IS_ERR(omap_root)) {
apfs_err(sb, "unable to read the omap root node");
err = PTR_ERR(omap_root);
goto fail;
}
if (write) {
apfs_assert_in_transaction(sb, &omap_raw->om_o);
ASSERT(buffer_trans(bh));
omap_raw->om_tree_oid = cpu_to_le64(omap_root->object.block_nr);
}
omap->omap_latest_snap = le64_to_cpu(omap_raw->om_most_recent_snap);
omap_raw = NULL;
brelse(bh);
if (omap->omap_root)
apfs_node_free(omap->omap_root);
omap->omap_root = omap_root;
return 0;
fail:
brelse(bh);
return err;
}
/**
* apfs_first_read_omap - Find and read the omap root node during mount
* @sb: superblock structure
*
* On success, returns 0 and sets APFS_SB(@sb)->s_omap; on failure returns a
* negative error code.
*/
static int apfs_first_read_omap(struct super_block *sb)
{
struct apfs_sb_info *sbi = NULL;
struct apfs_omap *omap = NULL;
int err;
/*
* For each volume, the first mount that gets here is responsible
* for reading the omap. Other mounts (for other snapshots) just
* go through the container's volume list to retrieve it. This results
* in coarse locking as usual: with some thought it would be possible
* to allow other volumes to read their own omaps at the same time,
* but I don't see the point.
*/
mutex_lock(&nxs_mutex);
sbi = APFS_SB(sb);
/* The current transaction and all snapshots share a single omap */
omap = apfs_get_omap(sb);
if (omap) {
sbi->s_omap = omap;
err = 0;
goto out;
}
omap = apfs_alloc_omap();
if (!omap) {
err = -ENOMEM;
goto out;
}
sbi->s_omap = omap;
err = apfs_read_omap(sb, false /* write */);
if (err) {
kfree(omap);
sbi->s_omap = NULL;
goto out;
}
++omap->omap_refcnt;
err = 0;
out:
mutex_unlock(&nxs_mutex);
return err;
}
/**
* apfs_unset_omap - Unset the object map in a superblock
* @sb: superblock structure
*
* Shrinks the omap reference, frees the omap if needed, and sets the field to
* NULL atomically in relation to apfs_first_read_omap(). So, no other mount
* can grab a new reference halfway through.
*/
static void apfs_unset_omap(struct super_block *sb)
{
struct apfs_omap **omap_p = NULL;
struct apfs_omap *omap = NULL;
omap_p = &APFS_SB(sb)->s_omap;
omap = *omap_p;
if (!omap)
return;
mutex_lock(&nxs_mutex);
if (--omap->omap_refcnt != 0)
goto out;
apfs_node_free(omap->omap_root);
kfree(omap);
out:
*omap_p = NULL;
mutex_unlock(&nxs_mutex);
}
/**
* apfs_read_catalog - Find and read the catalog root node
* @sb: superblock structure
* @write: request write access?
*
* On success, returns 0 and sets APFS_SB(@sb)->s_cat_root; on failure returns
* a negative error code.
*/
int apfs_read_catalog(struct super_block *sb, bool write)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_superblock *vsb_raw = sbi->s_vsb_raw;
struct apfs_node *root_node;
ASSERT(sbi->s_omap && sbi->s_omap->omap_root);
root_node = apfs_read_node(sb, le64_to_cpu(vsb_raw->apfs_root_tree_oid),
APFS_OBJ_VIRTUAL, write);
if (IS_ERR(root_node)) {
apfs_err(sb, "unable to read catalog root node");
return PTR_ERR(root_node);
}
if (sbi->s_cat_root)
apfs_node_free(sbi->s_cat_root);
sbi->s_cat_root = root_node;
return 0;
}
static void apfs_put_super(struct super_block *sb)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_nx_transaction *trans = NULL;
/* Cleanups won't reschedule themselves during unmount */
flush_work(&sbi->s_orphan_cleanup_work);
/* We are about to commit anyway */
trans = &APFS_NXI(sb)->nx_transaction;
cancel_delayed_work_sync(&trans->t_work);
/* Stop flushing orphans and update the volume as needed */
if (!(sb->s_flags & SB_RDONLY)) {
struct apfs_superblock *vsb_raw;
struct buffer_head *vsb_bh;
int err;
err = apfs_transaction_start(sb, APFS_TRANS_SYNC);
if (err) {
apfs_err(sb, "unmount transaction start failed (err:%d)", err);
goto fail;
}
vsb_raw = sbi->s_vsb_raw;
vsb_bh = sbi->s_vobject.o_bh;
apfs_assert_in_transaction(sb, &vsb_raw->apfs_o);
ASSERT(buffer_trans(vsb_bh));
apfs_update_software_info(sb);
vsb_raw->apfs_unmount_time = cpu_to_le64(ktime_get_real_ns());
set_buffer_csum(vsb_bh);
/* Guarantee commit */
sbi->s_nxi->nx_transaction.t_state |= APFS_NX_TRANS_FORCE_COMMIT;
err = apfs_transaction_commit(sb);
if (err) {
apfs_err(sb, "unmount transaction commit failed (err:%d)", err);
apfs_transaction_abort(sb);
goto fail;
}
}
/*
* Even if this particular volume/snapshot was read-only, the container
* may have changed and need an update here.
*/
apfs_make_super_copy(sb);
fail:
/*
* This is essentially the cleanup for apfs_fill_super(). It goes here
* because generic_shutdown_super() only calls ->put_super() when the
* root dentry has been set, that is, when apfs_fill_super() succeeded.
* The rest of the mount cleanup is done directly by ->kill_sb().
*/
iput(sbi->s_private_dir);
sbi->s_private_dir = NULL;
apfs_node_free(sbi->s_cat_root);
sbi->s_cat_root = NULL;
apfs_unset_omap(sb);
apfs_unmap_volume_super(sb);
}
static struct kmem_cache *apfs_inode_cachep;
static struct inode *apfs_alloc_inode(struct super_block *sb)
{
struct apfs_inode_info *ai;
struct apfs_dstream_info *dstream;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 18, 0) || RHEL_VERSION_GE(9, 1)
ai = alloc_inode_sb(sb, apfs_inode_cachep, GFP_KERNEL);
#else
ai = kmem_cache_alloc(apfs_inode_cachep, GFP_KERNEL);
#endif
if (!ai)
return NULL;
dstream = &ai->i_dstream;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0) /* iversion came in 4.16 */
inode_set_iversion(&ai->vfs_inode, 1);
#else
ai->vfs_inode.i_version = 1;
#endif
dstream->ds_sb = sb;
dstream->ds_inode = &ai->vfs_inode;
dstream->ds_cached_ext.len = 0;
dstream->ds_ext_dirty = false;
ai->i_nchildren = 0;
INIT_LIST_HEAD(&ai->i_list);
ai->i_cleaned = false;
return &ai->vfs_inode;
}
static void apfs_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
kmem_cache_free(apfs_inode_cachep, APFS_I(inode));
}
static void apfs_destroy_inode(struct inode *inode)
{
call_rcu(&inode->i_rcu, apfs_i_callback);
}
static void init_once(void *p)
{
struct apfs_inode_info *ai = (struct apfs_inode_info *)p;
struct apfs_dstream_info *dstream = &ai->i_dstream;
spin_lock_init(&dstream->ds_ext_lock);
inode_init_once(&ai->vfs_inode);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 9, 0)
#define SLAB_MEM_SPREAD 0
#endif
static int __init init_inodecache(void)
{
apfs_inode_cachep = kmem_cache_create("apfs_inode_cache",
sizeof(struct apfs_inode_info),
0, (SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD|SLAB_ACCOUNT),
init_once);
if (apfs_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
static int apfs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
struct super_block *sb = inode->i_sb;
struct apfs_nxsb_info *nxi = APFS_SB(sb)->s_nxi;
int err;
err = apfs_transaction_start(sb, APFS_TRANS_REG);
if (err)
return err;
err = apfs_update_inode(inode, NULL /* new_name */);
if (err)
goto fail;
/* Don't commit yet, or the inode will get flushed again and lock up */
nxi->nx_transaction.t_state |= APFS_NX_TRANS_DEFER_COMMIT;
err = apfs_transaction_commit(sb);
if (err)
goto fail;
return 0;
fail:
apfs_transaction_abort(sb);
return err;
}
static void destroy_inodecache(void)
{
/*
* Make sure all delayed rcu free inodes are flushed before we
* destroy cache.
*/
rcu_barrier();
kmem_cache_destroy(apfs_inode_cachep);
}
static int apfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
struct apfs_sb_info *sbi = APFS_SB(sb);
struct apfs_nxsb_info *nxi = APFS_NXI(sb);
struct apfs_nx_superblock *msb_raw;
struct apfs_superblock *vol;
u64 fsid, free_blocks;
int err;
down_read(&nxi->nx_big_sem);
msb_raw = nxi->nx_raw;
vol = sbi->s_vsb_raw;
buf->f_type = APFS_NX_MAGIC;
/* Nodes are assumed to fit in a page, for now */
buf->f_bsize = sb->s_blocksize;
/* Volumes share the whole disk space */
buf->f_blocks = le64_to_cpu(msb_raw->nx_block_count);
/*
* It takes some work to retrieve the free block count because we
* can't assume that the spaceman has been read yet. It would be
* cleaner if we always did that on first mount (TODO).
*/
err = apfs_spaceman_get_free_blkcnt(sb, &free_blocks);
if (err)
goto fail;
buf->f_bfree = free_blocks;
buf->f_bavail = free_blocks;
/* The file count is only for the mounted volume */
buf->f_files = le64_to_cpu(vol->apfs_num_files) +
le64_to_cpu(vol->apfs_num_directories) +
le64_to_cpu(vol->apfs_num_symlinks) +
le64_to_cpu(vol->apfs_num_other_fsobjects);
/*
* buf->f_ffree is left undefined for now. Maybe it should report the
* number of available cnids, like hfsplus attempts to do.
*/
buf->f_namelen = APFS_NAME_LEN;
/* There are no clear rules for the fsid, so we follow ext2 here */
fsid = le64_to_cpup((void *)vol->apfs_vol_uuid) ^
le64_to_cpup((void *)vol->apfs_vol_uuid + sizeof(u64));
buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
fail:
up_read(&nxi->nx_big_sem);
return err;
}
static int apfs_show_options(struct seq_file *seq, struct dentry *root)
{
struct apfs_sb_info *sbi = APFS_SB(root->d_sb);
struct apfs_nxsb_info *nxi = APFS_NXI(root->d_sb);
if (sbi->s_vol_nr != 0)
seq_printf(seq, ",vol=%u", sbi->s_vol_nr);
if (sbi->s_snap_name)
seq_printf(seq, ",snap=%s", sbi->s_snap_name);
if (uid_valid(sbi->s_uid))
seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns,
sbi->s_uid));
if (gid_valid(sbi->s_gid))
seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns,
sbi->s_gid));
if (nxi->nx_flags & APFS_CHECK_NODES)
seq_puts(seq, ",cknodes");
if (nxi->nx_tier2_info)
seq_printf(seq, ",tier2=%s", nxi->nx_tier2_info->blki_path);
return 0;
}
int apfs_sync_fs(struct super_block *sb, int wait)
{
int err;
/* TODO: actually start the commit and return without waiting? */
if (wait == 0)
return 0;
err = apfs_transaction_start(sb, APFS_TRANS_SYNC);
if (err)
return err;
APFS_SB(sb)->s_nxi->nx_transaction.t_state |= APFS_NX_TRANS_FORCE_COMMIT;
err = apfs_transaction_commit(sb);
if (err)
apfs_transaction_abort(sb);
return err;
}
/* Only supports read-only remounts, everything else is silently ignored */
static int apfs_remount(struct super_block *sb, int *flags, char *data)
{
int err = 0;
err = sync_filesystem(sb);
if (err)
return err;
/* TODO: race? Could a new transaction have started already? */
if (*flags & SB_RDONLY)
sb->s_flags |= SB_RDONLY;
/*
* TODO: readwrite remounts seem simple enough, but I worry about
* remounting aborted transactions. I would probably also need a
* dry-run version of parse_options().
*/
apfs_notice(sb, "all remounts can do is turn a volume read-only");
return 0;
}
static const struct super_operations apfs_sops = {
.alloc_inode = apfs_alloc_inode,
.destroy_inode = apfs_destroy_inode,
.write_inode = apfs_write_inode,
.evict_inode = apfs_evict_inode,
.put_super = apfs_put_super,
.sync_fs = apfs_sync_fs,
.statfs = apfs_statfs,
#if LINUX_VERSION_CODE < KERNEL_VERSION(7, 0, 0)
.remount_fs = apfs_remount,
#endif
.show_options = apfs_show_options,
};
enum {
Opt_readwrite, Opt_cknodes, Opt_uid, Opt_gid, Opt_vol, Opt_snap, Opt_tier2, Opt_err,
};
#if LINUX_VERSION_CODE < KERNEL_VERSION(7, 0, 0)
static const match_table_t tokens = {
{Opt_readwrite, "readwrite"},
{Opt_cknodes, "cknodes"},
{Opt_uid, "uid=%u"},
{Opt_gid, "gid=%u"},
{Opt_vol, "vol=%u"},
{Opt_snap, "snap=%s"},
{Opt_tier2, "tier2=%s"},
{Opt_err, NULL}
};
#else
static const struct fs_parameter_spec apfs_param_spec[] = {
fsparam_flag ("readwrite", Opt_readwrite),
fsparam_flag ("cknodes", Opt_cknodes),
fsparam_uid ("uid", Opt_uid),
fsparam_gid ("gid", Opt_gid),
fsparam_u32 ("vol", Opt_vol),
fsparam_string ("snap", Opt_snap),
fsparam_string ("tier2", Opt_tier2),
{}
};
#endif
/**
* apfs_set_nx_flags - Set the mount flags for the container, if allowed
* @sb: superblock structure
* @flags: flags to set
*/
static void apfs_set_nx_flags(struct super_block *sb, unsigned int flags)
{
struct apfs_nxsb_info *nxi = APFS_SB(sb)->s_nxi;
mutex_lock(&nxs_mutex);
/* The first mount thet gets here decides the flags for its container */
flags |= APFS_FLAGS_SET;
if (!(nxi->nx_flags & APFS_FLAGS_SET))
nxi->nx_flags = flags;
else if (flags != nxi->nx_flags)
apfs_warn(sb, "ignoring mount flags - container already mounted");
mutex_unlock(&nxs_mutex);
}
static void parse_options_set_flags(struct super_block *sb, struct apfs_sb_info *sbi,
unsigned int nx_flags)
{
struct apfs_nxsb_info *nxi = sbi->s_nxi;
apfs_set_nx_flags(sb, nx_flags);
if (!(sb->s_flags & SB_RDONLY)) {
if (nxi->nx_flags & APFS_READWRITE) {
apfs_notice(sb, "experimental write support is enabled");
} else {
apfs_warn(sb, "experimental writes disabled to avoid data loss");
apfs_warn(sb, "if you really want them, check the README");
sb->s_flags |= SB_RDONLY;
}
}
}
/**
* apfs_set_default_opts - Set the default mount options in the superblock
* @sbi: in-memory superblock info
*/
static void apfs_set_default_opts(struct apfs_sb_info *sbi)
{
sbi->s_vol_nr = 0;
sbi->s_snap_name = NULL;
sbi->s_tier2_path = NULL;
sbi->s_mount_opt = 0;
#ifdef CONFIG_APFS_RW_ALWAYS
/* Still risky, but some packagers want writable mounts by default */
sbi->s_mount_opt |= APFS_READWRITE;
#endif
sbi->s_uid = INVALID_UID;
sbi->s_gid = INVALID_GID;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(7, 0, 0)
/*
* Many of the parse_options() functions in other file systems return 0
* on error. This one returns an error code, and 0 on success.
*
* Note that even on failure, the caller is responsible for freeing all
* superblock fields.
*/
static int parse_options(struct apfs_sb_info *sbi, char *options)
{
char *p;
substring_t args[MAX_OPT_ARGS];
int option;
int err = 0;
if (!options)
return 0;
while ((p = strsep(&options, ",")) != NULL) {
int token;
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case Opt_readwrite:
/*
* Write support is not safe yet, so keep it disabled
* unless the user requests it explicitly.
*/
sbi->s_mount_opt |= APFS_READWRITE;
break;
case Opt_cknodes:
/*
* Right now, node checksums are too costly to enable
* by default. TODO: try to improve this.
*/
sbi->s_mount_opt |= APFS_CHECK_NODES;
break;
case Opt_uid:
err = match_int(&args[0], &option);
if (err)
return err;
sbi->s_uid = make_kuid(current_user_ns(), option);
if (!uid_valid(sbi->s_uid)) {
apfs_err(NULL, "invalid uid");
return -EINVAL;
}
break;
case Opt_gid:
err = match_int(&args[0], &option);
if (err)
return err;
sbi->s_gid = make_kgid(current_user_ns(), option);
if (!gid_valid(sbi->s_gid)) {
apfs_err(NULL, "invalid gid");
return -EINVAL;
}
break;
case Opt_vol:
err = match_int(&args[0], &sbi->s_vol_nr);
if (err) {
apfs_err(NULL, "invalid volume number");
return -EINVAL;
}
break;
case Opt_snap:
kfree(sbi->s_snap_name);
sbi->s_snap_name = match_strdup(&args[0]);
if (!sbi->s_snap_name)
return -ENOMEM;
break;
case Opt_tier2:
kfree(sbi->s_tier2_path);
sbi->s_tier2_path = match_strdup(&args[0]);
if (!sbi->s_tier2_path)
return -ENOMEM;
break;
default:
apfs_warn(NULL, "invalid mount option %s", p);
return -EINVAL;
}
}
return 0;
}
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(7, 0, 0) */
static int apfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
struct apfs_sb_info *sbi = fc->s_fs_info;
int opt;
struct fs_parse_result result;
opt = fs_parse(fc, apfs_param_spec, param, &result);
if (opt < 0)
return opt;
switch (opt) {
case Opt_readwrite:
/*
* Write support is not safe yet, so keep it disabled
* unless the user requests it explicitly.
*/
sbi->s_mount_opt |= APFS_READWRITE;
break;
case Opt_cknodes:
/*
* Right now, node checksums are too costly to enable
* by default. TODO: try to improve this.
*/
sbi->s_mount_opt |= APFS_CHECK_NODES;
break;
case Opt_uid:
sbi->s_uid = result.uid;
break;
case Opt_gid:
sbi->s_gid = result.gid;
break;
case Opt_vol:
sbi->s_vol_nr = result.uint_32;
break;
case Opt_snap:
kfree(sbi->s_snap_name);
sbi->s_snap_name = kstrdup(param->string, GFP_KERNEL);
if (!sbi->s_snap_name)
return -ENOMEM;
break;
case Opt_tier2:
kfree(sbi->s_tier2_path);
sbi->s_tier2_path = kstrdup(param->string, GFP_KERNEL);
if (!sbi->s_tier2_path)
return -ENOMEM;
break;
default:
return -EINVAL;
}
return 0;
}
#endif
/**
* apfs_check_nx_features - Check for unsupported features in the container
* @sb: superblock structure
*
* Returns -EINVAL if unsupported incompatible features are found, otherwise
* returns 0.
*/
static int apfs_check_nx_features(struct super_block *sb)
{
struct apfs_nx_superblock *msb_raw = NULL;
u64 features;
bool fusion;
msb_raw = APFS_NXI(sb)->nx_raw;
if (!msb_raw) {
apfs_alert(sb, "feature checks are misplaced");
return -EINVAL;
}
features = le64_to_cpu(msb_raw->nx_incompatible_features);
if (features & ~APFS_NX_SUPPORTED_INCOMPAT_MASK) {
apfs_warn(sb, "unknown incompatible container features (0x%llx)", features);
return -EINVAL;
}
fusion = features & APFS_NX_INCOMPAT_FUSION;
if (fusion && !APFS_NXI(sb)->nx_tier2_info) {
apfs_warn(sb, "fusion drive - please use the \"tier2\" mount option");
return -EINVAL;
}
if (!fusion && APFS_NXI(sb)->nx_tier2_info) {
apfs_warn(sb, "not a fusion drive - what's the second disk for?");
return -EINVAL;
}
if (fusion) {
if (!sb_rdonly(sb)) {
apfs_warn(sb, "writes to fusion drives not yet supported");
sb->s_flags |= SB_RDONLY;
}
}
features = le64_to_cpu(msb_raw->nx_readonly_compatible_features);
if (features & ~APFS_NX_SUPPORTED_ROCOMPAT_MASK) {
apfs_warn(sb, "unknown read-only compatible container features (0x%llx)", features);
if (!sb_rdonly(sb)) {
apfs_warn(sb, "container can't be mounted read-write");
return -EINVAL;
}
}
return 0;
}
/**
* apfs_check_vol_features - Check for unsupported features in the volume
* @sb: superblock structure
*
* Returns -EINVAL if unsupported incompatible features are found, otherwise
* returns 0.
*/
static int apfs_check_vol_features(struct super_block *sb)
{
struct apfs_superblock *vsb_raw = NULL;
u64 features;
vsb_raw = APFS_SB(sb)->s_vsb_raw;
if (!vsb_raw) {
apfs_alert(sb, "feature checks are misplaced");
return -EINVAL;
}
features = le64_to_cpu(vsb_raw->apfs_incompatible_features);
if (features & ~APFS_SUPPORTED_INCOMPAT_MASK) {
apfs_warn(sb, "unknown incompatible volume features (0x%llx)", features);
return -EINVAL;
}
if (features & APFS_INCOMPAT_DATALESS_SNAPS) {
/*
* I haven't encountered dataless snapshots myself yet (TODO).
* I'm not even sure what they are, so be safe.
*/
if (!sb_rdonly(sb)) {
apfs_warn(sb, "writes to volumes with dataless snapshots not yet supported");
return -EINVAL;
}
apfs_warn(sb, "volume has dataless snapshots");
}
if (features & APFS_INCOMPAT_ENC_ROLLED) {
apfs_warn(sb, "encrypted volumes are not supported");
return -EINVAL;
}
if (features & APFS_INCOMPAT_INCOMPLETE_RESTORE) {
apfs_warn(sb, "incomplete restore is not supported");
return -EINVAL;
}
if (features & APFS_INCOMPAT_PFK) {
apfs_warn(sb, "PFK is not supported");
return -EINVAL;
}
if (features & APFS_INCOMPAT_SECONDARY_FSROOT) {
apfs_warn(sb, "secondary fsroot is not supported");
return -EINVAL;
}
if (features & APFS_INCOMPAT_SEALED_VOLUME) {
if (!sb_rdonly(sb)) {
apfs_warn(sb, "writes to sealed volumes are not yet supported");
return -EINVAL;
}
apfs_info(sb, "volume is sealed");
}
/*
* As far as I can see, all this feature seems to do is define a new
* flag (which I call APFS_FILE_EXTENT_PREALLOCATED) for extents that
* are fully after the end of their file. I don't get why this change
* is incompatible instead of read-only compatible, so I fear I might
* be missing something. I will never be certain though, so for now
* allow the mount and hope for the best.
*/
if (features & APFS_INCOMPAT_EXTENT_PREALLOC_FLAG)
apfs_warn(sb, "extent prealloc flag is set");
features = le64_to_cpu(vsb_raw->apfs_fs_flags);
/* Some encrypted volumes are readable anyway */
if (!(features & APFS_FS_UNENCRYPTED))
apfs_warn(sb, "volume is encrypted, may not be read correctly");
features = le64_to_cpu(vsb_raw->apfs_readonly_compatible_features);
if (features & ~APFS_SUPPORTED_ROCOMPAT_MASK) {
apfs_warn(sb, "unknown read-only compatible volume features (0x%llx)", features);
if (!sb_rdonly(sb)) {
apfs_warn(sb, "volume can't be mounted read-write");
return -EINVAL;
}
}
return 0;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
/**
* apfs_setup_bdi - Set up the bdi for the superblock
* @sb: superblock structure
*
* Returns 0 on success, or a negative error code in case of failure.
*/
static int apfs_setup_bdi(struct super_block *sb)
{
struct apfs_nxsb_info *nxi = APFS_NXI(sb);
struct apfs_blkdev_info *bd_info = NULL;
struct backing_dev_info *bdi_dev = NULL, *bdi_sb = NULL;
int err;
bd_info = nxi->nx_blkdev_info;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0) || RHEL_VERSION_GE(9, 0)
bdi_dev = bd_info->blki_bdev->bd_disk->bdi;
#else
bdi_dev = bd_info->blki_bdev->bd_bdi;
#endif
err = super_setup_bdi(sb);
if (err)
return err;
bdi_sb = sb->s_bdi;
bdi_sb->ra_pages = bdi_dev->ra_pages;
bdi_sb->io_pages = bdi_dev->io_pages;
bdi_sb->capabilities = bdi_dev->capabilities;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0)
bdi_sb->capabilities &= ~BDI_CAP_WRITEBACK;
#else
bdi_sb->capabilities |= BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY;
#endif
return 0;
}
#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0) */
/* This is needed for readahead, so old kernels will be slower */
static int apfs_setup_bdi(struct super_block *sb)
{
return 0;
}
#endif
static void apfs_set_trans_buffer_limit(struct super_block *sb)
{
struct apfs_nxsb_info *nxi = APFS_NXI(sb);
unsigned long memsize_in_blocks;
struct sysinfo info = {0};
si_meminfo(&info);
memsize_in_blocks = info.totalram << (PAGE_SHIFT - sb->s_blocksize_bits);
/*
* Buffer heads are not reclaimed while they are part of the current
* transaction, so systems with little memory will crash if we don't
* commit often enough. This hack should make that happen in general,
* but I still need to get the reclaim to work eventually (TODO).
*/
if (memsize_in_blocks >= 16 * APFS_TRANS_BUFFERS_MAX)
nxi->nx_trans_buffers_max = APFS_TRANS_BUFFERS_MAX;
else
nxi->nx_trans_buffers_max = memsize_in_blocks / 16;
}
static int apfs_fill_super(struct super_block *sb, void *data, int silent)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
struct inode *root = NULL, *priv = NULL;
int err;
/*
* This function doesn't write anything to disk, that happens later
* when an actual transaction begins. So, it's not generally a problem
* if other mounts for the same container fill their own supers at the
* same time (the few critical sections will be protected by
* nxs_mutex), nor is it a problem if other mounted volumes want to
* make reads while the mount is taking place. But we definitely don't
* want any writes, or else we could find ourselves reading stale
* blocks after CoW, among other issues.
*/
down_read(&APFS_NXI(sb)->nx_big_sem);
err = apfs_setup_bdi(sb);
if (err)
goto failed_volume;
parse_options_set_flags(sb, sbi, sbi->s_mount_opt);
err = apfs_map_volume_super(sb, false /* write */);
if (err)
goto failed_volume;
err = apfs_check_vol_features(sb);
if (err)
goto failed_omap;
/*
* The omap needs to be set before the call to apfs_read_catalog().
* It's also shared with all the snapshots, so it needs to be read
* before we switch to the old superblock.
*/
err = apfs_first_read_omap(sb);
if (err)
goto failed_omap;
if (sbi->s_snap_name) {
err = apfs_switch_to_snapshot(sb);
if (err)
goto failed_cat;
}
err = apfs_read_catalog(sb, false /* write */);
if (err)
goto failed_cat;
sb->s_op = &apfs_sops;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 17, 0)
set_default_d_op(sb, &apfs_dentry_operations);
#else
sb->s_d_op = &apfs_dentry_operations;
#endif
sb->s_xattr = apfs_xattr_handlers;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_time_gran = 1; /* Nanosecond granularity */
/*
* At this point everything is already set up for the inode reads,
* which take care of their own locking as always.
*/
up_read(&APFS_NXI(sb)->nx_big_sem);
sbi->s_private_dir = apfs_iget(sb, APFS_PRIV_DIR_INO_NUM);
if (IS_ERR(sbi->s_private_dir)) {
apfs_err(sb, "unable to get private-dir inode");
err = PTR_ERR(sbi->s_private_dir);
goto failed_private_dir;
}
root = apfs_iget(sb, APFS_ROOT_DIR_INO_NUM);
if (IS_ERR(root)) {
apfs_err(sb, "unable to get root inode");
err = PTR_ERR(root);
goto failed_mount;
}
sb->s_root = d_make_root(root);
if (!sb->s_root) {
apfs_err(sb, "unable to get root dentry");
err = -ENOMEM;
goto failed_mount;
}
INIT_WORK(&sbi->s_orphan_cleanup_work, apfs_orphan_cleanup_work);
if (!(sb->s_flags & SB_RDONLY)) {
priv = sbi->s_private_dir;
if (APFS_I(priv)->i_nchildren)
schedule_work(&sbi->s_orphan_cleanup_work);
}
return 0;
failed_mount:
iput(sbi->s_private_dir);
failed_private_dir:
sbi->s_private_dir = NULL;
down_read(&APFS_NXI(sb)->nx_big_sem);
apfs_node_free(sbi->s_cat_root);
failed_cat:
apfs_unset_omap(sb);
failed_omap:
apfs_unmap_volume_super(sb);
failed_volume:
up_read(&APFS_NXI(sb)->nx_big_sem);
return err;
}
/**
* apfs_strings_are_equal - Compare two possible NULL strings
* @str1: the first string
* @str2: the second string
*/
static bool apfs_strings_are_equal(const char *str1, const char *str2)
{
if (str1 == str2) /* Both are NULL */
return true;
if (!str1 || !str2) /* One is NULL */
return false;
return strcmp(str1, str2) == 0;
}
/**
* apfs_test_super - Check if two volume superblocks are for the same volume
* @sb: superblock structure for a currently mounted volume
* @data: superblock info for the volume being mounted
*/
static int apfs_test_super(struct super_block *sb, void *data)
{
struct apfs_sb_info *sbi_1 = data;
struct apfs_sb_info *sbi_2 = APFS_SB(sb);
if (sbi_1->s_nxi != sbi_2->s_nxi)
return false;
if (sbi_1->s_vol_nr != sbi_2->s_vol_nr)
return false;
return apfs_strings_are_equal(sbi_1->s_snap_name, sbi_2->s_snap_name);
}
/**
* apfs_set_super - Assign the device and an info struct to a superblock
* @sb: superblock structure to set
* @data: superblock info for the volume being mounted
*/
static int apfs_set_super(struct super_block *sb, void *data)
{
struct apfs_sb_info *sbi = data;
struct apfs_nxsb_info *nxi = sbi->s_nxi;
int err;
/*
* This fake device number will be unique to this volume-snapshot
* combination. It gets reported by stat(), so that userland tools can
* use it to tell different mountpoints apart.
*/
err = get_anon_bdev(&sbi->s_anon_dev);
if (err)
return err;
/*
* This is the actual device number, shared by all volumes and
* snapshots. It gets reported by the mountinfo file, and it seems that
* udisks uses it to decide if a device is mounted, so it must be set.
*
* TODO: does this work for fusion drives?
*/
sb->s_dev = nxi->nx_blkdev_info->blki_bdev->bd_dev;
sb->s_fs_info = sbi;
return 0;
}
/*
* Wrapper for lookup_bdev() that supports older kernels.
*/
static int apfs_lookup_bdev(const char *pathname, dev_t *dev)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 11, 0)
struct block_device *bdev;
bdev = lookup_bdev(pathname);
if (IS_ERR(bdev))
return PTR_ERR(bdev);
*dev = bdev->bd_dev;
bdput(bdev);
return 0;
#else
return lookup_bdev(pathname, dev);
#endif
}
/**
* apfs_blkdev_setup - Open a block device and set its info struct
* @info_p: info struct to set
* @dev_name: path name for the block device to open
* @mode: FMODE_* mask
*
* Returns 0 on success, or a negative error code in case of failure.
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 5, 0)
static int apfs_blkdev_setup(struct apfs_blkdev_info **info_p, const char *dev_name, blk_mode_t mode)
#else
static int apfs_blkdev_setup(struct apfs_blkdev_info **info_p, const char *dev_name, fmode_t mode)
#endif
{
struct apfs_blkdev_info *info = NULL;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 9, 0) || RHEL_VERSION_GE(9, 5)
struct file *file = NULL;
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(6, 8, 0)
struct bdev_handle *handle = NULL;
#endif
struct block_device *bdev = NULL;
int ret;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->blki_path = kstrdup(dev_name, GFP_KERNEL);
if (!info->blki_path) {
ret = -ENOMEM;
goto fail;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 9, 0) || RHEL_VERSION_GE(9, 5)
file = bdev_file_open_by_path(dev_name, mode, &apfs_fs_type, NULL);
if (IS_ERR(file)) {
ret = PTR_ERR(file);
goto fail;
}
info->blki_bdev_file = file;
bdev = file_bdev(file);
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(6, 8, 0)
handle = bdev_open_by_path(dev_name, mode, &apfs_fs_type, NULL);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
goto fail;
}
info->blki_bdev_handle = handle;
bdev = handle->bdev;
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(6, 5, 0) || RHEL_VERSION_GE(9, 4)
bdev = blkdev_get_by_path(dev_name, mode, &apfs_fs_type, NULL);
#else
bdev = blkdev_get_by_path(dev_name, mode, &apfs_fs_type);
#endif
if (IS_ERR(bdev)) {
ret = PTR_ERR(bdev);
goto fail;
}
info->blki_bdev = bdev;
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 5, 0) && !RHEL_VERSION_GE(9, 4)
info->blki_mode = mode;
#endif
*info_p = info;
return 0;
fail:
kfree(info->blki_path);
info->blki_path = NULL;
kfree(info);
info = NULL;
return ret;
}
/**
* apfs_attach_nxi - Attach container sb info to a volume's sb info
* @sbi: new superblock info structure for the volume to be mounted
* @dev_name: path name for the container's block device
* @mode: FMODE_* mask
*
* Returns 0 on success, or a negative error code in case of failure.
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 5, 0)
static int apfs_attach_nxi(struct apfs_sb_info *sbi, const char *dev_name, blk_mode_t mode)
#else
static int apfs_attach_nxi(struct apfs_sb_info *sbi, const char *dev_name, fmode_t mode)
#endif
{
struct apfs_nxsb_info *nxi = NULL;
dev_t dev = 0;
int ret;
mutex_lock(&nxs_mutex);
ret = apfs_lookup_bdev(dev_name, &dev);
if (ret)
goto out;
nxi = apfs_nx_find_by_dev(dev);
if (!nxi) {
nxi = kzalloc(sizeof(*nxi), GFP_KERNEL);
if (!nxi) {
ret = -ENOMEM;
goto out;
}
ret = apfs_blkdev_setup(&nxi->nx_blkdev_info, dev_name, mode);
if (ret)
goto out;
if (sbi->s_tier2_path) {
ret = apfs_blkdev_setup(&nxi->nx_tier2_info, sbi->s_tier2_path, mode);
if (ret) {
apfs_blkdev_cleanup(nxi->nx_blkdev_info);
nxi->nx_blkdev_info = NULL;
goto out;
}
/* We won't need this anymore, so why waste memory? */
kfree(sbi->s_tier2_path);
sbi->s_tier2_path = NULL;
}
init_rwsem(&nxi->nx_big_sem);
list_add(&nxi->nx_list, &nxs);
INIT_LIST_HEAD(&nxi->vol_list);
apfs_transaction_init(&nxi->nx_transaction);
}
list_add(&sbi->list, &nxi->vol_list);
sbi->s_nxi = nxi;
++nxi->nx_refcnt;
ret = 0;
out:
if (ret) {
kfree(nxi);
nxi = NULL;
}
mutex_unlock(&nxs_mutex);
return ret;
}
/*
* This function is a copy of mount_bdev() that allows multiple mounts.
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(7, 0, 0)
static int apfs_test_super_fc(struct super_block *sb, struct fs_context *fc);
static int apfs_set_super_fc(struct super_block *sb, struct fs_context *fc);
static int apfs_get_tree(struct fs_context *fc)
#else
static struct dentry *apfs_mount(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data)
#endif
{
struct super_block *sb;
struct apfs_sb_info *sbi;
struct apfs_blkdev_info *bd_info = NULL, *tier2_info = NULL;
int error = 0;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(7, 0, 0)
blk_mode_t mode = sb_open_mode(fc->sb_flags);
void *data = fc->fs_private;
const char *dev_name = fc->source;
sbi = fc->s_fs_info;
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(6, 5, 0) || RHEL_VERSION_GE(9, 4)
blk_mode_t mode = sb_open_mode(flags);
#else
fmode_t mode = FMODE_READ | FMODE_EXCL;
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(7, 0, 0)
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (!sbi)
return ERR_PTR(-ENOMEM);
apfs_set_default_opts(sbi);
/* Set up the fields that sget() will need to id the superblock */
error = parse_options(sbi, data);
if (error)
goto out_free_sbi;
#endif
/* Make sure that snapshots are mounted read-only */
if (sbi->s_snap_name)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(7, 0, 0)
fc->sb_flags |= SB_RDONLY;
#else
flags |= SB_RDONLY;
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 5, 0) && !RHEL_VERSION_GE(9, 4)
if (!(flags & SB_RDONLY))
mode |= FMODE_WRITE;
#endif
error = apfs_attach_nxi(sbi, dev_name, mode);
if (error)
goto out_free_sbi;
/* TODO: lockfs stuff? Btrfs doesn't seem to care */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(7, 0, 0)
fc->sb_flags |= SB_NOSEC;
sb = sget_fc(fc, apfs_test_super_fc, apfs_set_super_fc);
#else
sb = sget(fs_type, apfs_test_super, apfs_set_super, flags | SB_NOSEC, sbi);
#endif
if (IS_ERR(sb)) {
error = PTR_ERR(sb);
goto out_unmap_super;
}
bd_info = APFS_NXI(sb)->nx_blkdev_info;
tier2_info = APFS_NXI(sb)->nx_tier2_info;
/*
* I'm doing something hacky with s_dev inside ->kill_sb(), so I want
* to find out as soon as possible if I messed it up.
*/
WARN_ON(sb->s_dev != bd_info->blki_bdev->bd_dev);
if (sb->s_root) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(7, 0, 0)
if ((fc->sb_flags ^ sb->s_flags) & SB_RDONLY) {
#else
if ((flags ^ sb->s_flags) & SB_RDONLY) {
#endif
error = -EBUSY;
deactivate_locked_super(sb);
goto out_unmap_super;
}
/* Only one superblock per volume */
apfs_free_main_super(sbi);
kfree(sbi->s_snap_name);
sbi->s_snap_name = NULL;
kfree(sbi->s_tier2_path);
sbi->s_tier2_path = NULL;
kfree(sbi);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(7, 0, 0)
fc->s_fs_info = NULL;
#endif
sbi = NULL;
} else {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(7, 0, 0)
fc->s_fs_info = NULL;
#endif
if (!sbi->s_snap_name && !tier2_info)
snprintf(sb->s_id, sizeof(sb->s_id), "%pg:%u", bd_info->blki_bdev, sbi->s_vol_nr);
else if (!tier2_info)
snprintf(sb->s_id, sizeof(sb->s_id), "%pg:%u:%s", bd_info->blki_bdev, sbi->s_vol_nr, sbi->s_snap_name);
else if (!sbi->s_snap_name)
snprintf(sb->s_id, sizeof(sb->s_id), "%pg+%pg:%u", bd_info->blki_bdev, tier2_info->blki_bdev, sbi->s_vol_nr);
else
snprintf(sb->s_id, sizeof(sb->s_id), "%pg+%pg:%u:%s", bd_info->blki_bdev, tier2_info->blki_bdev, sbi->s_vol_nr, sbi->s_snap_name);
error = apfs_read_main_super(sb);
if (error) {
deactivate_locked_super(sb);
goto out_return_error;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 5, 0) && !RHEL_VERSION_GE(9, 4)
sb->s_mode = mode;
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(7, 0, 0)
error = apfs_fill_super(sb, data, fc->sb_flags & SB_SILENT ? 1 : 0);
#else
error = apfs_fill_super(sb, data, flags & SB_SILENT ? 1 : 0);
#endif
if (error) {
deactivate_locked_super(sb);
goto out_return_error;
}
sb->s_flags |= SB_ACTIVE;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(7, 0, 0)
fc->root = dget(sb->s_root);
return 0;
#else
return dget(sb->s_root);
#endif
out_unmap_super:
#if LINUX_VERSION_CODE < KERNEL_VERSION(7, 0, 0)
apfs_free_main_super(sbi);
#endif
out_free_sbi:
#if LINUX_VERSION_CODE < KERNEL_VERSION(7, 0, 0)
kfree(sbi->s_snap_name);
kfree(sbi->s_tier2_path);
kfree(sbi);
#endif
out_return_error:
#if LINUX_VERSION_CODE >= KERNEL_VERSION(7, 0, 0)
return error;
#else
return ERR_PTR(error);
#endif
}
/**
* apfs_free_sb_info - Free the sb info and release all remaining fields
* @sb: superblock structure
*
* This function does not include the cleanup for apfs_fill_super(), which
* already took place inside ->put_super() (or maybe inside apfs_fill_super()
* itself if the mount failed).
*/
static void apfs_free_sb_info(struct super_block *sb)
{
struct apfs_sb_info *sbi = NULL;
sbi = APFS_SB(sb);
apfs_free_main_super(sbi);
sb->s_fs_info = NULL;
kfree(sbi->s_snap_name);
sbi->s_snap_name = NULL;
kfree(sbi->s_tier2_path);
sbi->s_tier2_path = NULL;
if (sbi->s_dflt_pfk)
kfree(sbi->s_dflt_pfk);
kfree(sbi);
sbi = NULL;
}
static void apfs_kill_sb(struct super_block *sb)
{
struct apfs_sb_info *sbi = APFS_SB(sb);
/*
* We need to delist the superblock before freeing its info to avoid a
* race with apfs_test_super(), but we can't call kill_super_notify()
* from the driver. The available wrapper is kill_anon_super(), but our
* s_dev is set to the actual device (that gets freed later along with
* the container), not to the anon device that we keep on the sbi. So,
* we change that before the call; this is safe because other mounters
* won't revive this super, even if apfs_test_super() succeeds.
*/
sb->s_dev = sbi->s_anon_dev;
kill_anon_super(sb);
apfs_free_sb_info(sb);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(7, 0, 0)
static int apfs_test_super_fc(struct super_block *sb, struct fs_context *fc)
{
return apfs_test_super(sb, fc->s_fs_info);
}
static int apfs_set_super_fc(struct super_block *sb, struct fs_context *fc)
{
return apfs_set_super(sb, fc->s_fs_info);
}
static int apfs_reconfigure(struct fs_context *fc)
{
struct super_block *sb = fc->root->d_sb;
int flags = fc->sb_flags;
return apfs_remount(sb, &flags, fc->fs_private);
}
static void apfs_free_fc(struct fs_context *fc)
{
struct apfs_sb_info *sbi = fc->s_fs_info;
if (sbi) {
apfs_free_main_super(sbi);
kfree(sbi->s_snap_name);
kfree(sbi->s_tier2_path);
kfree(sbi);
}
}
static const struct fs_context_operations apfs_context_ops = {
.get_tree = apfs_get_tree,
.reconfigure = apfs_reconfigure,
.free = apfs_free_fc,
.parse_param = apfs_parse_param,
};
static int apfs_init_fs_context(struct fs_context *fc)
{
struct apfs_sb_info *sbi;
/* Setup happens here now instead of the top of apfs_mount */
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (!sbi)
return -ENOMEM;
apfs_set_default_opts(sbi);
fc->s_fs_info = sbi;
fc->ops = &apfs_context_ops;
return 0;
}
#endif /* LINUX_VERSION_CODE >= 7.0.0 */
static struct file_system_type apfs_fs_type = {
.owner = THIS_MODULE,
.name = "apfs",
#if LINUX_VERSION_CODE < KERNEL_VERSION(7, 0, 0)
.mount = apfs_mount,
#else
.init_fs_context = apfs_init_fs_context,
#endif
.kill_sb = apfs_kill_sb,
.fs_flags = FS_REQUIRES_DEV,
};
MODULE_ALIAS_FS("apfs");
static int __init init_apfs_fs(void)
{
int err = 0;
err = init_inodecache();
if (err)
return err;
err = register_filesystem(&apfs_fs_type);
if (err)
destroy_inodecache();
return err;
}
static void __exit exit_apfs_fs(void)
{
unregister_filesystem(&apfs_fs_type);
destroy_inodecache();
}
MODULE_AUTHOR("Ernesto A. Fernández");
MODULE_DESCRIPTION("Apple File System");
MODULE_VERSION(GIT_COMMIT);
MODULE_LICENSE("GPL");
module_init(init_apfs_fs)
module_exit(exit_apfs_fs)
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