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Message-Id: <20251020020749.5522-3-linkinjeon@kernel.org>
Date: Mon, 20 Oct 2025 11:07:40 +0900
From: Namjae Jeon <linkinjeon@...nel.org>
To: viro@...iv.linux.org.uk,
brauner@...nel.org,
hch@...radead.org,
hch@....de,
tytso@....edu,
willy@...radead.org,
jack@...e.cz,
djwong@...nel.org,
josef@...icpanda.com,
sandeen@...deen.net,
rgoldwyn@...e.com,
xiang@...nel.org,
dsterba@...e.com,
pali@...nel.org,
ebiggers@...nel.org,
neil@...wn.name,
amir73il@...il.com
Cc: linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org,
iamjoonsoo.kim@....com,
cheol.lee@....com,
jay.sim@....com,
gunho.lee@....com,
Namjae Jeon <linkinjeon@...nel.org>
Subject: [PATCH 02/11] ntfsplus: add super block operations
This adds the implementation of superblock operations for ntfsplus.
Signed-off-by: Namjae Jeon <linkinjeon@...nel.org>
---
fs/ntfsplus/super.c | 2716 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 2716 insertions(+)
create mode 100644 fs/ntfsplus/super.c
diff --git a/fs/ntfsplus/super.c b/fs/ntfsplus/super.c
new file mode 100644
index 000000000000..1803eeec5618
--- /dev/null
+++ b/fs/ntfsplus/super.c
@@ -0,0 +1,2716 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * NTFS kernel super block handling. Part of the Linux-NTFS project.
+ *
+ * Copyright (c) 2001-2012 Anton Altaparmakov and Tuxera Inc.
+ * Copyright (c) 2001,2002 Richard Russon
+ * Copyright (c) 2025 LG Electronics Co., Ltd.
+ */
+
+#include <linux/blkdev.h> /* For bdev_logical_block_size(). */
+#include <linux/backing-dev.h>
+#include <linux/vfs.h>
+#include <linux/fs_struct.h>
+#include <linux/sched/mm.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
+#include <uapi/linux/ntfs.h>
+
+#include "misc.h"
+#include "logfile.h"
+#include "index.h"
+#include "ntfs.h"
+#include "ea.h"
+#include "volume.h"
+
+/* A global default upcase table and a corresponding reference count. */
+static __le16 *default_upcase;
+static unsigned long ntfs_nr_upcase_users;
+
+static struct workqueue_struct *ntfs_wq;
+
+/* Error constants/strings used in inode.c::ntfs_show_options(). */
+enum {
+ /* One of these must be present, default is ON_ERRORS_CONTINUE. */
+ ON_ERRORS_PANIC = 0x01,
+ ON_ERRORS_REMOUNT_RO = 0x02,
+ ON_ERRORS_CONTINUE = 0x04,
+};
+
+static const struct constant_table ntfs_param_enums[] = {
+ { "panic", ON_ERRORS_PANIC },
+ { "remount-ro", ON_ERRORS_REMOUNT_RO },
+ { "continue", ON_ERRORS_CONTINUE },
+ {}
+};
+
+enum {
+ Opt_uid,
+ Opt_gid,
+ Opt_umask,
+ Opt_dmask,
+ Opt_fmask,
+ Opt_errors,
+ Opt_nls,
+ Opt_show_sys_files,
+ Opt_case_sensitive,
+ Opt_disable_sparse,
+ Opt_mft_zone_multiplier,
+ Opt_preallocated_size,
+};
+
+static const struct fs_parameter_spec ntfs_parameters[] = {
+ fsparam_u32("uid", Opt_uid),
+ fsparam_u32("gid", Opt_gid),
+ fsparam_u32oct("umask", Opt_umask),
+ fsparam_u32oct("dmask", Opt_dmask),
+ fsparam_u32oct("fmask", Opt_fmask),
+ fsparam_string("nls", Opt_nls),
+ fsparam_enum("errors", Opt_errors, ntfs_param_enums),
+ fsparam_flag("show_sys_files", Opt_show_sys_files),
+ fsparam_flag("case_sensitive", Opt_case_sensitive),
+ fsparam_flag("disable_sparse", Opt_disable_sparse),
+ fsparam_s32("mft_zone_multiplier", Opt_mft_zone_multiplier),
+ fsparam_u64("preallocated_size", Opt_preallocated_size),
+ {}
+};
+
+static int ntfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+ struct ntfs_volume *vol = fc->s_fs_info;
+ struct fs_parse_result result;
+ int opt;
+ char *nls_name = NULL;
+
+ opt = fs_parse(fc, ntfs_parameters, param, &result);
+ if (opt < 0)
+ return opt;
+
+ switch (opt) {
+ case Opt_uid:
+ vol->uid = make_kuid(current_user_ns(), result.uint_32);
+ break;
+ case Opt_gid:
+ vol->gid = make_kgid(current_user_ns(), result.uint_32);
+ break;
+ case Opt_umask:
+ vol->fmask = vol->dmask = result.uint_32;
+ break;
+ case Opt_dmask:
+ vol->dmask = result.uint_32;
+ break;
+ case Opt_fmask:
+ vol->fmask = result.uint_32;
+ break;
+ case Opt_errors:
+ vol->on_errors = result.uint_32;
+ break;
+ case Opt_nls:
+ if (nls_name && nls_name != param->string)
+ kfree(nls_name);
+ nls_name = param->string;
+ vol->nls_map = load_nls(nls_name);
+ param->string = NULL;
+ break;
+ case Opt_mft_zone_multiplier:
+ if (vol->mft_zone_multiplier && vol->mft_zone_multiplier !=
+ result.int_32) {
+ ntfs_error(vol->sb, "Cannot change mft_zone_multiplier on remount.");
+ return -EINVAL;
+ }
+ if (result.int_32 < 1 || result.int_32 > 4) {
+ ntfs_error(vol->sb,
+ "Invalid mft_zone_multiplier. Using default value, i.e. 1.");
+ vol->mft_zone_multiplier = 1;
+ } else
+ vol->mft_zone_multiplier = result.int_32;
+ break;
+ case Opt_show_sys_files:
+ if (result.boolean)
+ NVolSetShowSystemFiles(vol);
+ else
+ NVolClearShowSystemFiles(vol);
+ break;
+ case Opt_case_sensitive:
+ if (result.boolean)
+ NVolSetCaseSensitive(vol);
+ else
+ NVolClearCaseSensitive(vol);
+ break;
+ case Opt_preallocated_size:
+ vol->preallocated_size = (loff_t)result.uint_64;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * ntfs_mark_quotas_out_of_date - mark the quotas out of date on an ntfs volume
+ * @vol: ntfs volume on which to mark the quotas out of date
+ *
+ * Mark the quotas out of date on the ntfs volume @vol and return 'true' on
+ * success and 'false' on error.
+ */
+static bool ntfs_mark_quotas_out_of_date(struct ntfs_volume *vol)
+{
+ struct ntfs_index_context *ictx;
+ struct quota_control_entry *qce;
+ const __le32 qid = QUOTA_DEFAULTS_ID;
+ int err;
+
+ ntfs_debug("Entering.");
+ if (NVolQuotaOutOfDate(vol))
+ goto done;
+ if (!vol->quota_ino || !vol->quota_q_ino) {
+ ntfs_error(vol->sb, "Quota inodes are not open.");
+ return false;
+ }
+ inode_lock(vol->quota_q_ino);
+ ictx = ntfs_index_ctx_get(NTFS_I(vol->quota_q_ino), I30, 4);
+ if (!ictx) {
+ ntfs_error(vol->sb, "Failed to get index context.");
+ goto err_out;
+ }
+ err = ntfs_index_lookup(&qid, sizeof(qid), ictx);
+ if (err) {
+ if (err == -ENOENT)
+ ntfs_error(vol->sb, "Quota defaults entry is not present.");
+ else
+ ntfs_error(vol->sb, "Lookup of quota defaults entry failed.");
+ goto err_out;
+ }
+ if (ictx->data_len < offsetof(struct quota_control_entry, sid)) {
+ ntfs_error(vol->sb, "Quota defaults entry size is invalid. Run chkdsk.");
+ goto err_out;
+ }
+ qce = (struct quota_control_entry *)ictx->data;
+ if (le32_to_cpu(qce->version) != QUOTA_VERSION) {
+ ntfs_error(vol->sb,
+ "Quota defaults entry version 0x%x is not supported.",
+ le32_to_cpu(qce->version));
+ goto err_out;
+ }
+ ntfs_debug("Quota defaults flags = 0x%x.", le32_to_cpu(qce->flags));
+ /* If quotas are already marked out of date, no need to do anything. */
+ if (qce->flags & QUOTA_FLAG_OUT_OF_DATE)
+ goto set_done;
+ /*
+ * If quota tracking is neither requested, nor enabled and there are no
+ * pending deletes, no need to mark the quotas out of date.
+ */
+ if (!(qce->flags & (QUOTA_FLAG_TRACKING_ENABLED |
+ QUOTA_FLAG_TRACKING_REQUESTED |
+ QUOTA_FLAG_PENDING_DELETES)))
+ goto set_done;
+ /*
+ * Set the QUOTA_FLAG_OUT_OF_DATE bit thus marking quotas out of date.
+ * This is verified on WinXP to be sufficient to cause windows to
+ * rescan the volume on boot and update all quota entries.
+ */
+ qce->flags |= QUOTA_FLAG_OUT_OF_DATE;
+ /* Ensure the modified flags are written to disk. */
+ ntfs_index_entry_flush_dcache_page(ictx);
+ ntfs_index_entry_mark_dirty(ictx);
+set_done:
+ ntfs_index_ctx_put(ictx);
+ inode_unlock(vol->quota_q_ino);
+ /*
+ * We set the flag so we do not try to mark the quotas out of date
+ * again on remount.
+ */
+ NVolSetQuotaOutOfDate(vol);
+done:
+ ntfs_debug("Done.");
+ return true;
+err_out:
+ if (ictx)
+ ntfs_index_ctx_put(ictx);
+ inode_unlock(vol->quota_q_ino);
+ return false;
+}
+
+static int ntfs_reconfigure(struct fs_context *fc)
+{
+ struct super_block *sb = fc->root->d_sb;
+ struct ntfs_volume *vol = NTFS_SB(sb);
+
+ ntfs_debug("Entering with remount");
+
+ sync_filesystem(sb);
+
+ /*
+ * For the read-write compiled driver, if we are remounting read-write,
+ * make sure there are no volume errors and that no unsupported volume
+ * flags are set. Also, empty the logfile journal as it would become
+ * stale as soon as something is written to the volume and mark the
+ * volume dirty so that chkdsk is run if the volume is not umounted
+ * cleanly. Finally, mark the quotas out of date so Windows rescans
+ * the volume on boot and updates them.
+ *
+ * When remounting read-only, mark the volume clean if no volume errors
+ * have occurred.
+ */
+ if (sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY)) {
+ static const char *es = ". Cannot remount read-write.";
+
+ /* Remounting read-write. */
+ if (NVolErrors(vol)) {
+ ntfs_error(sb, "Volume has errors and is read-only%s",
+ es);
+ return -EROFS;
+ }
+ if (vol->vol_flags & VOLUME_IS_DIRTY) {
+ ntfs_error(sb, "Volume is dirty and read-only%s", es);
+ return -EROFS;
+ }
+ if (vol->vol_flags & VOLUME_MODIFIED_BY_CHKDSK) {
+ ntfs_error(sb, "Volume has been modified by chkdsk and is read-only%s", es);
+ return -EROFS;
+ }
+ if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) {
+ ntfs_error(sb, "Volume has unsupported flags set (0x%x) and is read-only%s",
+ le16_to_cpu(vol->vol_flags), es);
+ return -EROFS;
+ }
+ if (vol->logfile_ino && !ntfs_empty_logfile(vol->logfile_ino)) {
+ ntfs_error(sb, "Failed to empty journal LogFile%s",
+ es);
+ NVolSetErrors(vol);
+ return -EROFS;
+ }
+ if (!ntfs_mark_quotas_out_of_date(vol)) {
+ ntfs_error(sb, "Failed to mark quotas out of date%s",
+ es);
+ NVolSetErrors(vol);
+ return -EROFS;
+ }
+ } else if (!sb_rdonly(sb) && (fc->sb_flags & SB_RDONLY)) {
+ /* Remounting read-only. */
+ if (!NVolErrors(vol)) {
+ if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY))
+ ntfs_warning(sb,
+ "Failed to clear dirty bit in volume information flags. Run chkdsk.");
+ }
+ }
+
+ ntfs_debug("Done.");
+ return 0;
+}
+
+const struct option_t on_errors_arr[] = {
+ { ON_ERRORS_PANIC, "panic" },
+ { ON_ERRORS_REMOUNT_RO, "remount-ro", },
+ { ON_ERRORS_CONTINUE, "continue", },
+ { 0, NULL }
+};
+
+void ntfs_handle_error(struct super_block *sb)
+{
+ struct ntfs_volume *vol = NTFS_SB(sb);
+
+ if (sb_rdonly(sb))
+ return;
+
+ if (vol->on_errors == ON_ERRORS_REMOUNT_RO) {
+ sb->s_flags |= SB_RDONLY;
+ pr_crit("(device %s): Filesystem has been set read-only\n",
+ sb->s_id);
+ } else if (vol->on_errors == ON_ERRORS_PANIC) {
+ panic("ntfs: (device %s): panic from previous error\n",
+ sb->s_id);
+ } else if (vol->on_errors == ON_ERRORS_CONTINUE) {
+ if (errseq_check(&sb->s_wb_err, vol->wb_err) == -ENODEV) {
+ NVolSetShutdown(vol);
+ vol->wb_err = sb->s_wb_err;
+ }
+ }
+}
+
+/**
+ * ntfs_write_volume_flags - write new flags to the volume information flags
+ * @vol: ntfs volume on which to modify the flags
+ * @flags: new flags value for the volume information flags
+ *
+ * Internal function. You probably want to use ntfs_{set,clear}_volume_flags()
+ * instead (see below).
+ *
+ * Replace the volume information flags on the volume @vol with the value
+ * supplied in @flags. Note, this overwrites the volume information flags, so
+ * make sure to combine the flags you want to modify with the old flags and use
+ * the result when calling ntfs_write_volume_flags().
+ *
+ * Return 0 on success and -errno on error.
+ */
+static int ntfs_write_volume_flags(struct ntfs_volume *vol, const __le16 flags)
+{
+ struct ntfs_inode *ni = NTFS_I(vol->vol_ino);
+ struct volume_information *vi;
+ struct ntfs_attr_search_ctx *ctx;
+ int err;
+
+ ntfs_debug("Entering, old flags = 0x%x, new flags = 0x%x.",
+ le16_to_cpu(vol->vol_flags), le16_to_cpu(flags));
+ mutex_lock(&ni->mrec_lock);
+ if (vol->vol_flags == flags)
+ goto done;
+ BUG_ON(!ni);
+ ctx = ntfs_attr_get_search_ctx(ni, NULL);
+ if (!ctx) {
+ err = -ENOMEM;
+ goto put_unm_err_out;
+ }
+ err = ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0,
+ ctx);
+ if (err)
+ goto put_unm_err_out;
+ vi = (struct volume_information *)((u8 *)ctx->attr +
+ le16_to_cpu(ctx->attr->data.resident.value_offset));
+ vol->vol_flags = vi->flags = flags;
+ mark_mft_record_dirty(ctx->ntfs_ino);
+ ntfs_attr_put_search_ctx(ctx);
+done:
+ mutex_unlock(&ni->mrec_lock);
+ ntfs_debug("Done.");
+ return 0;
+put_unm_err_out:
+ if (ctx)
+ ntfs_attr_put_search_ctx(ctx);
+ mutex_unlock(&ni->mrec_lock);
+ ntfs_error(vol->sb, "Failed with error code %i.", -err);
+ return err;
+}
+
+/**
+ * ntfs_set_volume_flags - set bits in the volume information flags
+ * @vol: ntfs volume on which to modify the flags
+ * @flags: flags to set on the volume
+ *
+ * Set the bits in @flags in the volume information flags on the volume @vol.
+ *
+ * Return 0 on success and -errno on error.
+ */
+int ntfs_set_volume_flags(struct ntfs_volume *vol, __le16 flags)
+{
+ flags &= VOLUME_FLAGS_MASK;
+ return ntfs_write_volume_flags(vol, vol->vol_flags | flags);
+}
+
+/**
+ * ntfs_clear_volume_flags - clear bits in the volume information flags
+ * @vol: ntfs volume on which to modify the flags
+ * @flags: flags to clear on the volume
+ *
+ * Clear the bits in @flags in the volume information flags on the volume @vol.
+ *
+ * Return 0 on success and -errno on error.
+ */
+int ntfs_clear_volume_flags(struct ntfs_volume *vol, __le16 flags)
+{
+ flags &= VOLUME_FLAGS_MASK;
+ flags = vol->vol_flags & cpu_to_le16(~le16_to_cpu(flags));
+ return ntfs_write_volume_flags(vol, flags);
+}
+
+/**
+ * is_boot_sector_ntfs - check whether a boot sector is a valid NTFS boot sector
+ * @sb: Super block of the device to which @b belongs.
+ * @b: Boot sector of device @sb to check.
+ * @silent: If 'true', all output will be silenced.
+ *
+ * is_boot_sector_ntfs() checks whether the boot sector @b is a valid NTFS boot
+ * sector. Returns 'true' if it is valid and 'false' if not.
+ *
+ * @sb is only needed for warning/error output, i.e. it can be NULL when silent
+ * is 'true'.
+ */
+static bool is_boot_sector_ntfs(const struct super_block *sb,
+ const struct ntfs_boot_sector *b, const bool silent)
+{
+ /*
+ * Check that checksum == sum of u32 values from b to the checksum
+ * field. If checksum is zero, no checking is done. We will work when
+ * the checksum test fails, since some utilities update the boot sector
+ * ignoring the checksum which leaves the checksum out-of-date. We
+ * report a warning if this is the case.
+ */
+ if ((void *)b < (void *)&b->checksum && b->checksum && !silent) {
+ __le32 *u;
+ u32 i;
+
+ for (i = 0, u = (__le32 *)b; u < (__le32 *)(&b->checksum); ++u)
+ i += le32_to_cpup(u);
+ if (le32_to_cpu(b->checksum) != i)
+ ntfs_warning(sb, "Invalid boot sector checksum.");
+ }
+ /* Check OEMidentifier is "NTFS " */
+ if (b->oem_id != magicNTFS)
+ goto not_ntfs;
+ /* Check bytes per sector value is between 256 and 4096. */
+ if (le16_to_cpu(b->bpb.bytes_per_sector) < 0x100 ||
+ le16_to_cpu(b->bpb.bytes_per_sector) > 0x1000)
+ goto not_ntfs;
+ /*
+ * Check sectors per cluster value is valid and the cluster size
+ * is not above the maximum (2MB).
+ */
+ if (b->bpb.sectors_per_cluster > 0x80 &&
+ b->bpb.sectors_per_cluster < 0xf4)
+ goto not_ntfs;
+
+ /* Check reserved/unused fields are really zero. */
+ if (le16_to_cpu(b->bpb.reserved_sectors) ||
+ le16_to_cpu(b->bpb.root_entries) ||
+ le16_to_cpu(b->bpb.sectors) ||
+ le16_to_cpu(b->bpb.sectors_per_fat) ||
+ le32_to_cpu(b->bpb.large_sectors) || b->bpb.fats)
+ goto not_ntfs;
+ /* Check clusters per file mft record value is valid. */
+ if ((u8)b->clusters_per_mft_record < 0xe1 ||
+ (u8)b->clusters_per_mft_record > 0xf7)
+ switch (b->clusters_per_mft_record) {
+ case 1: case 2: case 4: case 8: case 16: case 32: case 64:
+ break;
+ default:
+ goto not_ntfs;
+ }
+ /* Check clusters per index block value is valid. */
+ if ((u8)b->clusters_per_index_record < 0xe1 ||
+ (u8)b->clusters_per_index_record > 0xf7)
+ switch (b->clusters_per_index_record) {
+ case 1: case 2: case 4: case 8: case 16: case 32: case 64:
+ break;
+ default:
+ goto not_ntfs;
+ }
+ /*
+ * Check for valid end of sector marker. We will work without it, but
+ * many BIOSes will refuse to boot from a bootsector if the magic is
+ * incorrect, so we emit a warning.
+ */
+ if (!silent && b->end_of_sector_marker != cpu_to_le16(0xaa55))
+ ntfs_warning(sb, "Invalid end of sector marker.");
+ return true;
+not_ntfs:
+ return false;
+}
+
+/**
+ * read_ntfs_boot_sector - read the NTFS boot sector of a device
+ * @sb: super block of device to read the boot sector from
+ * @silent: if true, suppress all output
+ *
+ * Reads the boot sector from the device and validates it.
+ */
+static char *read_ntfs_boot_sector(struct super_block *sb,
+ const int silent)
+{
+ char *boot_sector;
+
+ boot_sector = ntfs_malloc_nofs(PAGE_SIZE);
+ if (!boot_sector)
+ return NULL;
+
+ if (ntfs_dev_read(sb, boot_sector, 0, PAGE_SIZE)) {
+ if (!silent)
+ ntfs_error(sb, "Unable to read primary boot sector.");
+ kfree(boot_sector);
+ return NULL;
+ }
+
+ if (!is_boot_sector_ntfs(sb, (struct ntfs_boot_sector *)boot_sector,
+ silent)) {
+ if (!silent)
+ ntfs_error(sb, "Primary boot sector is invalid.");
+ kfree(boot_sector);
+ return NULL;
+ }
+
+ return boot_sector;
+}
+
+/**
+ * parse_ntfs_boot_sector - parse the boot sector and store the data in @vol
+ * @vol: volume structure to initialise with data from boot sector
+ * @b: boot sector to parse
+ *
+ * Parse the ntfs boot sector @b and store all imporant information therein in
+ * the ntfs super block @vol. Return 'true' on success and 'false' on error.
+ */
+static bool parse_ntfs_boot_sector(struct ntfs_volume *vol,
+ const struct ntfs_boot_sector *b)
+{
+ unsigned int sectors_per_cluster, sectors_per_cluster_bits, nr_hidden_sects;
+ int clusters_per_mft_record, clusters_per_index_record;
+ s64 ll;
+
+ vol->sector_size = le16_to_cpu(b->bpb.bytes_per_sector);
+ vol->sector_size_bits = ffs(vol->sector_size) - 1;
+ ntfs_debug("vol->sector_size = %i (0x%x)", vol->sector_size,
+ vol->sector_size);
+ ntfs_debug("vol->sector_size_bits = %i (0x%x)", vol->sector_size_bits,
+ vol->sector_size_bits);
+ if (vol->sector_size < vol->sb->s_blocksize) {
+ ntfs_error(vol->sb,
+ "Sector size (%i) is smaller than the device block size (%lu). This is not supported.",
+ vol->sector_size, vol->sb->s_blocksize);
+ return false;
+ }
+
+ if (b->bpb.sectors_per_cluster >= 0xf4)
+ sectors_per_cluster = 1U << -(s8)b->bpb.sectors_per_cluster;
+ else
+ sectors_per_cluster = b->bpb.sectors_per_cluster;
+ ntfs_debug("sectors_per_cluster = 0x%x", b->bpb.sectors_per_cluster);
+ sectors_per_cluster_bits = ffs(sectors_per_cluster) - 1;
+ ntfs_debug("sectors_per_cluster_bits = 0x%x",
+ sectors_per_cluster_bits);
+ nr_hidden_sects = le32_to_cpu(b->bpb.hidden_sectors);
+ ntfs_debug("number of hidden sectors = 0x%x", nr_hidden_sects);
+ vol->cluster_size = vol->sector_size << sectors_per_cluster_bits;
+ vol->cluster_size_mask = vol->cluster_size - 1;
+ vol->cluster_size_bits = ffs(vol->cluster_size) - 1;
+ ntfs_debug("vol->cluster_size = %i (0x%x)", vol->cluster_size,
+ vol->cluster_size);
+ ntfs_debug("vol->cluster_size_mask = 0x%x", vol->cluster_size_mask);
+ ntfs_debug("vol->cluster_size_bits = %i", vol->cluster_size_bits);
+ if (vol->cluster_size < vol->sector_size) {
+ ntfs_error(vol->sb,
+ "Cluster size (%i) is smaller than the sector size (%i). This is not supported.",
+ vol->cluster_size, vol->sector_size);
+ return false;
+ }
+ clusters_per_mft_record = b->clusters_per_mft_record;
+ ntfs_debug("clusters_per_mft_record = %i (0x%x)",
+ clusters_per_mft_record, clusters_per_mft_record);
+ if (clusters_per_mft_record > 0)
+ vol->mft_record_size = vol->cluster_size <<
+ (ffs(clusters_per_mft_record) - 1);
+ else
+ /*
+ * When mft_record_size < cluster_size, clusters_per_mft_record
+ * = -log2(mft_record_size) bytes. mft_record_size normaly is
+ * 1024 bytes, which is encoded as 0xF6 (-10 in decimal).
+ */
+ vol->mft_record_size = 1 << -clusters_per_mft_record;
+ vol->mft_record_size_mask = vol->mft_record_size - 1;
+ vol->mft_record_size_bits = ffs(vol->mft_record_size) - 1;
+ ntfs_debug("vol->mft_record_size = %i (0x%x)", vol->mft_record_size,
+ vol->mft_record_size);
+ ntfs_debug("vol->mft_record_size_mask = 0x%x",
+ vol->mft_record_size_mask);
+ ntfs_debug("vol->mft_record_size_bits = %i (0x%x)",
+ vol->mft_record_size_bits, vol->mft_record_size_bits);
+ /*
+ * We cannot support mft record sizes above the PAGE_SIZE since
+ * we store $MFT/$DATA, the table of mft records in the page cache.
+ */
+ if (vol->mft_record_size > PAGE_SIZE) {
+ ntfs_error(vol->sb,
+ "Mft record size (%i) exceeds the PAGE_SIZE on your system (%lu). This is not supported.",
+ vol->mft_record_size, PAGE_SIZE);
+ return false;
+ }
+ /* We cannot support mft record sizes below the sector size. */
+ if (vol->mft_record_size < vol->sector_size) {
+ ntfs_warning(vol->sb, "Mft record size (%i) is smaller than the sector size (%i).",
+ vol->mft_record_size, vol->sector_size);
+ }
+ clusters_per_index_record = b->clusters_per_index_record;
+ ntfs_debug("clusters_per_index_record = %i (0x%x)",
+ clusters_per_index_record, clusters_per_index_record);
+ if (clusters_per_index_record > 0)
+ vol->index_record_size = vol->cluster_size <<
+ (ffs(clusters_per_index_record) - 1);
+ else
+ /*
+ * When index_record_size < cluster_size,
+ * clusters_per_index_record = -log2(index_record_size) bytes.
+ * index_record_size normaly equals 4096 bytes, which is
+ * encoded as 0xF4 (-12 in decimal).
+ */
+ vol->index_record_size = 1 << -clusters_per_index_record;
+ vol->index_record_size_mask = vol->index_record_size - 1;
+ vol->index_record_size_bits = ffs(vol->index_record_size) - 1;
+ ntfs_debug("vol->index_record_size = %i (0x%x)",
+ vol->index_record_size, vol->index_record_size);
+ ntfs_debug("vol->index_record_size_mask = 0x%x",
+ vol->index_record_size_mask);
+ ntfs_debug("vol->index_record_size_bits = %i (0x%x)",
+ vol->index_record_size_bits,
+ vol->index_record_size_bits);
+ /* We cannot support index record sizes below the sector size. */
+ if (vol->index_record_size < vol->sector_size) {
+ ntfs_error(vol->sb,
+ "Index record size (%i) is smaller than the sector size (%i). This is not supported.",
+ vol->index_record_size, vol->sector_size);
+ return false;
+ }
+ /*
+ * Get the size of the volume in clusters and check for 64-bit-ness.
+ * Windows currently only uses 32 bits to save the clusters so we do
+ * the same as it is much faster on 32-bit CPUs.
+ */
+ ll = le64_to_cpu(b->number_of_sectors) >> sectors_per_cluster_bits;
+ if ((u64)ll >= 1ULL << 32) {
+ ntfs_error(vol->sb, "Cannot handle 64-bit clusters.");
+ return false;
+ }
+ vol->nr_clusters = ll;
+ ntfs_debug("vol->nr_clusters = 0x%llx", vol->nr_clusters);
+ /*
+ * On an architecture where unsigned long is 32-bits, we restrict the
+ * volume size to 2TiB (2^41). On a 64-bit architecture, the compiler
+ * will hopefully optimize the whole check away.
+ */
+ if (sizeof(unsigned long) < 8) {
+ if ((ll << vol->cluster_size_bits) >= (1ULL << 41)) {
+ ntfs_error(vol->sb,
+ "Volume size (%lluTiB) is too large for this architecture. Maximum supported is 2TiB.",
+ ll >> (40 - vol->cluster_size_bits));
+ return false;
+ }
+ }
+ ll = le64_to_cpu(b->mft_lcn);
+ if (ll >= vol->nr_clusters) {
+ ntfs_error(vol->sb, "MFT LCN (%lli, 0x%llx) is beyond end of volume. Weird.",
+ ll, ll);
+ return false;
+ }
+ vol->mft_lcn = ll;
+ ntfs_debug("vol->mft_lcn = 0x%llx", vol->mft_lcn);
+ ll = le64_to_cpu(b->mftmirr_lcn);
+ if (ll >= vol->nr_clusters) {
+ ntfs_error(vol->sb, "MFTMirr LCN (%lli, 0x%llx) is beyond end of volume. Weird.",
+ ll, ll);
+ return false;
+ }
+ vol->mftmirr_lcn = ll;
+ ntfs_debug("vol->mftmirr_lcn = 0x%llx", vol->mftmirr_lcn);
+ /*
+ * Work out the size of the mft mirror in number of mft records. If the
+ * cluster size is less than or equal to the size taken by four mft
+ * records, the mft mirror stores the first four mft records. If the
+ * cluster size is bigger than the size taken by four mft records, the
+ * mft mirror contains as many mft records as will fit into one
+ * cluster.
+ */
+ if (vol->cluster_size <= (4 << vol->mft_record_size_bits))
+ vol->mftmirr_size = 4;
+ else
+ vol->mftmirr_size = vol->cluster_size >>
+ vol->mft_record_size_bits;
+ ntfs_debug("vol->mftmirr_size = %i", vol->mftmirr_size);
+ vol->serial_no = le64_to_cpu(b->volume_serial_number);
+ ntfs_debug("vol->serial_no = 0x%llx", vol->serial_no);
+
+ vol->sparse_compression_unit = 4;
+ if (vol->cluster_size > 4096) {
+ switch (vol->cluster_size) {
+ case 65536:
+ vol->sparse_compression_unit = 0;
+ break;
+ case 32768:
+ vol->sparse_compression_unit = 1;
+ break;
+ case 16384:
+ vol->sparse_compression_unit = 2;
+ break;
+ case 8192:
+ vol->sparse_compression_unit = 3;
+ break;
+ }
+ }
+
+ return true;
+}
+
+/**
+ * ntfs_setup_allocators - initialize the cluster and mft allocators
+ * @vol: volume structure for which to setup the allocators
+ *
+ * Setup the cluster (lcn) and mft allocators to the starting values.
+ */
+static void ntfs_setup_allocators(struct ntfs_volume *vol)
+{
+ s64 mft_zone_size, mft_lcn;
+
+ ntfs_debug("vol->mft_zone_multiplier = 0x%x",
+ vol->mft_zone_multiplier);
+ /* Determine the size of the MFT zone. */
+ mft_zone_size = vol->nr_clusters;
+ switch (vol->mft_zone_multiplier) { /* % of volume size in clusters */
+ case 4:
+ mft_zone_size >>= 1; /* 50% */
+ break;
+ case 3:
+ mft_zone_size = (mft_zone_size +
+ (mft_zone_size >> 1)) >> 2; /* 37.5% */
+ break;
+ case 2:
+ mft_zone_size >>= 2; /* 25% */
+ break;
+ /* case 1: */
+ default:
+ mft_zone_size >>= 3; /* 12.5% */
+ break;
+ }
+ /* Setup the mft zone. */
+ vol->mft_zone_start = vol->mft_zone_pos = vol->mft_lcn;
+ ntfs_debug("vol->mft_zone_pos = 0x%llx", vol->mft_zone_pos);
+ /*
+ * Calculate the mft_lcn for an unmodified NTFS volume (see mkntfs
+ * source) and if the actual mft_lcn is in the expected place or even
+ * further to the front of the volume, extend the mft_zone to cover the
+ * beginning of the volume as well. This is in order to protect the
+ * area reserved for the mft bitmap as well within the mft_zone itself.
+ * On non-standard volumes we do not protect it as the overhead would
+ * be higher than the speed increase we would get by doing it.
+ */
+ mft_lcn = (8192 + 2 * vol->cluster_size - 1) / vol->cluster_size;
+ if (mft_lcn * vol->cluster_size < 16 * 1024)
+ mft_lcn = (16 * 1024 + vol->cluster_size - 1) /
+ vol->cluster_size;
+ if (vol->mft_zone_start <= mft_lcn)
+ vol->mft_zone_start = 0;
+ ntfs_debug("vol->mft_zone_start = 0x%llx", vol->mft_zone_start);
+ /*
+ * Need to cap the mft zone on non-standard volumes so that it does
+ * not point outside the boundaries of the volume. We do this by
+ * halving the zone size until we are inside the volume.
+ */
+ vol->mft_zone_end = vol->mft_lcn + mft_zone_size;
+ while (vol->mft_zone_end >= vol->nr_clusters) {
+ mft_zone_size >>= 1;
+ vol->mft_zone_end = vol->mft_lcn + mft_zone_size;
+ }
+ ntfs_debug("vol->mft_zone_end = 0x%llx", vol->mft_zone_end);
+ /*
+ * Set the current position within each data zone to the start of the
+ * respective zone.
+ */
+ vol->data1_zone_pos = vol->mft_zone_end;
+ ntfs_debug("vol->data1_zone_pos = 0x%llx", vol->data1_zone_pos);
+ vol->data2_zone_pos = 0;
+ ntfs_debug("vol->data2_zone_pos = 0x%llx", vol->data2_zone_pos);
+
+ /* Set the mft data allocation position to mft record 24. */
+ vol->mft_data_pos = 24;
+ ntfs_debug("vol->mft_data_pos = 0x%llx", vol->mft_data_pos);
+}
+
+static struct lock_class_key mftmirr_runlist_lock_key,
+ mftmirr_mrec_lock_key;
+/**
+ * load_and_init_mft_mirror - load and setup the mft mirror inode for a volume
+ * @vol: ntfs super block describing device whose mft mirror to load
+ *
+ * Return 'true' on success or 'false' on error.
+ */
+static bool load_and_init_mft_mirror(struct ntfs_volume *vol)
+{
+ struct inode *tmp_ino;
+ struct ntfs_inode *tmp_ni;
+
+ ntfs_debug("Entering.");
+ /* Get mft mirror inode. */
+ tmp_ino = ntfs_iget(vol->sb, FILE_MFTMirr);
+ if (IS_ERR(tmp_ino)) {
+ if (!IS_ERR(tmp_ino))
+ iput(tmp_ino);
+ /* Caller will display error message. */
+ return false;
+ }
+ lockdep_set_class(&NTFS_I(tmp_ino)->runlist.lock,
+ &mftmirr_runlist_lock_key);
+ lockdep_set_class(&NTFS_I(tmp_ino)->mrec_lock,
+ &mftmirr_mrec_lock_key);
+ /*
+ * Re-initialize some specifics about $MFTMirr's inode as
+ * ntfs_read_inode() will have set up the default ones.
+ */
+ /* Set uid and gid to root. */
+ tmp_ino->i_uid = GLOBAL_ROOT_UID;
+ tmp_ino->i_gid = GLOBAL_ROOT_GID;
+ /* Regular file. No access for anyone. */
+ tmp_ino->i_mode = S_IFREG;
+ /* No VFS initiated operations allowed for $MFTMirr. */
+ tmp_ino->i_op = &ntfs_empty_inode_ops;
+ tmp_ino->i_fop = &ntfs_empty_file_ops;
+ /* Put in our special address space operations. */
+ tmp_ino->i_mapping->a_ops = &ntfs_mst_aops;
+ tmp_ni = NTFS_I(tmp_ino);
+ /* The $MFTMirr, like the $MFT is multi sector transfer protected. */
+ NInoSetMstProtected(tmp_ni);
+ NInoSetSparseDisabled(tmp_ni);
+ /*
+ * Set up our little cheat allowing us to reuse the async read io
+ * completion handler for directories.
+ */
+ tmp_ni->itype.index.block_size = vol->mft_record_size;
+ tmp_ni->itype.index.block_size_bits = vol->mft_record_size_bits;
+ vol->mftmirr_ino = tmp_ino;
+ ntfs_debug("Done.");
+ return true;
+}
+
+/**
+ * check_mft_mirror - compare contents of the mft mirror with the mft
+ * @vol: ntfs super block describing device whose mft mirror to check
+ *
+ * Return 'true' on success or 'false' on error.
+ *
+ * Note, this function also results in the mft mirror runlist being completely
+ * mapped into memory. The mft mirror write code requires this and will BUG()
+ * should it find an unmapped runlist element.
+ */
+static bool check_mft_mirror(struct ntfs_volume *vol)
+{
+ struct super_block *sb = vol->sb;
+ struct ntfs_inode *mirr_ni;
+ struct folio *mft_folio = NULL, *mirr_folio = NULL;
+ u8 *kmft = NULL, *kmirr = NULL;
+ struct runlist_element *rl, rl2[2];
+ pgoff_t index;
+ int mrecs_per_page, i;
+
+ ntfs_debug("Entering.");
+ /* Compare contents of $MFT and $MFTMirr. */
+ mrecs_per_page = PAGE_SIZE / vol->mft_record_size;
+ BUG_ON(!mrecs_per_page);
+ BUG_ON(!vol->mftmirr_size);
+ index = i = 0;
+ do {
+ u32 bytes;
+
+ /* Switch pages if necessary. */
+ if (!(i % mrecs_per_page)) {
+ if (index) {
+ ntfs_unmap_folio(mirr_folio, kmirr);
+ ntfs_unmap_folio(mft_folio, kmft);
+ }
+ /* Get the $MFT page. */
+ mft_folio = ntfs_read_mapping_folio(vol->mft_ino->i_mapping,
+ index);
+ if (IS_ERR(mft_folio)) {
+ ntfs_error(sb, "Failed to read $MFT.");
+ return false;
+ }
+ kmft = kmap_local_folio(mft_folio, 0);
+ /* Get the $MFTMirr page. */
+ mirr_folio = ntfs_read_mapping_folio(vol->mftmirr_ino->i_mapping,
+ index);
+ if (IS_ERR(mirr_folio)) {
+ ntfs_error(sb, "Failed to read $MFTMirr.");
+ goto mft_unmap_out;
+ }
+ kmirr = kmap_local_folio(mirr_folio, 0);
+ ++index;
+ }
+
+ /* Do not check the record if it is not in use. */
+ if (((struct mft_record *)kmft)->flags & MFT_RECORD_IN_USE) {
+ /* Make sure the record is ok. */
+ if (ntfs_is_baad_recordp((__le32 *)kmft)) {
+ ntfs_error(sb,
+ "Incomplete multi sector transfer detected in mft record %i.",
+ i);
+mm_unmap_out:
+ ntfs_unmap_folio(mirr_folio, kmirr);
+mft_unmap_out:
+ ntfs_unmap_folio(mft_folio, kmft);
+ return false;
+ }
+ }
+ /* Do not check the mirror record if it is not in use. */
+ if (((struct mft_record *)kmirr)->flags & MFT_RECORD_IN_USE) {
+ if (ntfs_is_baad_recordp((__le32 *)kmirr)) {
+ ntfs_error(sb,
+ "Incomplete multi sector transfer detected in mft mirror record %i.",
+ i);
+ goto mm_unmap_out;
+ }
+ }
+ /* Get the amount of data in the current record. */
+ bytes = le32_to_cpu(((struct mft_record *)kmft)->bytes_in_use);
+ if (bytes < sizeof(struct mft_record_old) ||
+ bytes > vol->mft_record_size ||
+ ntfs_is_baad_recordp((__le32 *)kmft)) {
+ bytes = le32_to_cpu(((struct mft_record *)kmirr)->bytes_in_use);
+ if (bytes < sizeof(struct mft_record_old) ||
+ bytes > vol->mft_record_size ||
+ ntfs_is_baad_recordp((__le32 *)kmirr))
+ bytes = vol->mft_record_size;
+ }
+ kmft += vol->mft_record_size;
+ kmirr += vol->mft_record_size;
+ } while (++i < vol->mftmirr_size);
+ /* Release the last folios. */
+ ntfs_unmap_folio(mirr_folio, kmirr);
+ ntfs_unmap_folio(mft_folio, kmft);
+
+ /* Construct the mft mirror runlist by hand. */
+ rl2[0].vcn = 0;
+ rl2[0].lcn = vol->mftmirr_lcn;
+ rl2[0].length = (vol->mftmirr_size * vol->mft_record_size +
+ vol->cluster_size - 1) / vol->cluster_size;
+ rl2[1].vcn = rl2[0].length;
+ rl2[1].lcn = LCN_ENOENT;
+ rl2[1].length = 0;
+ /*
+ * Because we have just read all of the mft mirror, we know we have
+ * mapped the full runlist for it.
+ */
+ mirr_ni = NTFS_I(vol->mftmirr_ino);
+ down_read(&mirr_ni->runlist.lock);
+ rl = mirr_ni->runlist.rl;
+ /* Compare the two runlists. They must be identical. */
+ i = 0;
+ do {
+ if (rl2[i].vcn != rl[i].vcn || rl2[i].lcn != rl[i].lcn ||
+ rl2[i].length != rl[i].length) {
+ ntfs_error(sb, "$MFTMirr location mismatch. Run chkdsk.");
+ up_read(&mirr_ni->runlist.lock);
+ return false;
+ }
+ } while (rl2[i++].length);
+ up_read(&mirr_ni->runlist.lock);
+ ntfs_debug("Done.");
+ return true;
+}
+
+/**
+ * load_and_check_logfile - load and check the logfile inode for a volume
+ *
+ * Return 0 on success or errno on error.
+ */
+static int load_and_check_logfile(struct ntfs_volume *vol,
+ struct restart_page_header **rp)
+{
+ struct inode *tmp_ino;
+ int err = 0;
+
+ ntfs_debug("Entering.");
+ tmp_ino = ntfs_iget(vol->sb, FILE_LogFile);
+ if (IS_ERR(tmp_ino)) {
+ if (!IS_ERR(tmp_ino))
+ iput(tmp_ino);
+ /* Caller will display error message. */
+ return -ENOENT;
+ }
+ if (!ntfs_check_logfile(tmp_ino, rp))
+ err = -EINVAL;
+ NInoSetSparseDisabled(NTFS_I(tmp_ino));
+ vol->logfile_ino = tmp_ino;
+ ntfs_debug("Done.");
+ return err;
+}
+
+#define NTFS_HIBERFIL_HEADER_SIZE 4096
+
+/**
+ * check_windows_hibernation_status - check if Windows is suspended on a volume
+ * @vol: ntfs super block of device to check
+ *
+ * Check if Windows is hibernated on the ntfs volume @vol. This is done by
+ * looking for the file hiberfil.sys in the root directory of the volume. If
+ * the file is not present Windows is definitely not suspended.
+ *
+ * If hiberfil.sys exists and is less than 4kiB in size it means Windows is
+ * definitely suspended (this volume is not the system volume). Caveat: on a
+ * system with many volumes it is possible that the < 4kiB check is bogus but
+ * for now this should do fine.
+ *
+ * If hiberfil.sys exists and is larger than 4kiB in size, we need to read the
+ * hiberfil header (which is the first 4kiB). If this begins with "hibr",
+ * Windows is definitely suspended. If it is completely full of zeroes,
+ * Windows is definitely not hibernated. Any other case is treated as if
+ * Windows is suspended. This caters for the above mentioned caveat of a
+ * system with many volumes where no "hibr" magic would be present and there is
+ * no zero header.
+ *
+ * Return 0 if Windows is not hibernated on the volume, >0 if Windows is
+ * hibernated on the volume, and -errno on error.
+ */
+static int check_windows_hibernation_status(struct ntfs_volume *vol)
+{
+ static const __le16 hiberfil[13] = { cpu_to_le16('h'),
+ cpu_to_le16('i'), cpu_to_le16('b'),
+ cpu_to_le16('e'), cpu_to_le16('r'),
+ cpu_to_le16('f'), cpu_to_le16('i'),
+ cpu_to_le16('l'), cpu_to_le16('.'),
+ cpu_to_le16('s'), cpu_to_le16('y'),
+ cpu_to_le16('s'), 0 };
+ u64 mref;
+ struct inode *vi;
+ struct folio *folio;
+ u32 *kaddr, *kend, *start_addr = NULL;
+ struct ntfs_name *name = NULL;
+ int ret = 1;
+
+ ntfs_debug("Entering.");
+ /*
+ * Find the inode number for the hibernation file by looking up the
+ * filename hiberfil.sys in the root directory.
+ */
+ inode_lock(vol->root_ino);
+ mref = ntfs_lookup_inode_by_name(NTFS_I(vol->root_ino), hiberfil, 12,
+ &name);
+ inode_unlock(vol->root_ino);
+ kfree(name);
+ if (IS_ERR_MREF(mref)) {
+ ret = MREF_ERR(mref);
+ /* If the file does not exist, Windows is not hibernated. */
+ if (ret == -ENOENT) {
+ ntfs_debug("hiberfil.sys not present. Windows is not hibernated on the volume.");
+ return 0;
+ }
+ /* A real error occurred. */
+ ntfs_error(vol->sb, "Failed to find inode number for hiberfil.sys.");
+ return ret;
+ }
+ /* Get the inode. */
+ vi = ntfs_iget(vol->sb, MREF(mref));
+ if (IS_ERR(vi)) {
+ if (!IS_ERR(vi))
+ iput(vi);
+ ntfs_error(vol->sb, "Failed to load hiberfil.sys.");
+ return IS_ERR(vi) ? PTR_ERR(vi) : -EIO;
+ }
+ if (unlikely(i_size_read(vi) < NTFS_HIBERFIL_HEADER_SIZE)) {
+ ntfs_debug("hiberfil.sys is smaller than 4kiB (0x%llx). Windows is hibernated on the volume. This is not the system volume.",
+ i_size_read(vi));
+ goto iput_out;
+ }
+
+ folio = ntfs_read_mapping_folio(vi->i_mapping, 0);
+ if (IS_ERR(folio)) {
+ ntfs_error(vol->sb, "Failed to read from hiberfil.sys.");
+ ret = PTR_ERR(folio);
+ goto iput_out;
+ }
+ start_addr = (u32 *)kmap_local_folio(folio, 0);
+ kaddr = start_addr;
+ if (*(__le32 *)kaddr == cpu_to_le32(0x72626968)/*'hibr'*/) {
+ ntfs_debug("Magic \"hibr\" found in hiberfil.sys. Windows is hibernated on the volume. This is the system volume.");
+ goto unm_iput_out;
+ }
+ kend = kaddr + NTFS_HIBERFIL_HEADER_SIZE/sizeof(*kaddr);
+ do {
+ if (unlikely(*kaddr)) {
+ ntfs_debug("hiberfil.sys is larger than 4kiB (0x%llx), does not contain the \"hibr\" magic, and does not have a zero header. Windows is hibernated on the volume. This is not the system volume.",
+ i_size_read(vi));
+ goto unm_iput_out;
+ }
+ } while (++kaddr < kend);
+ ntfs_debug("hiberfil.sys contains a zero header. Windows is not hibernated on the volume. This is the system volume.");
+ ret = 0;
+unm_iput_out:
+ ntfs_unmap_folio(folio, start_addr);
+iput_out:
+ iput(vi);
+ return ret;
+}
+
+/**
+ * load_and_init_quota - load and setup the quota file for a volume if present
+ * @vol: ntfs super block describing device whose quota file to load
+ *
+ * Return 'true' on success or 'false' on error. If $Quota is not present, we
+ * leave vol->quota_ino as NULL and return success.
+ */
+static bool load_and_init_quota(struct ntfs_volume *vol)
+{
+ static const __le16 Quota[7] = { cpu_to_le16('$'),
+ cpu_to_le16('Q'), cpu_to_le16('u'),
+ cpu_to_le16('o'), cpu_to_le16('t'),
+ cpu_to_le16('a'), 0 };
+ static __le16 Q[3] = { cpu_to_le16('$'),
+ cpu_to_le16('Q'), 0 };
+ struct ntfs_name *name = NULL;
+ u64 mref;
+ struct inode *tmp_ino;
+
+ ntfs_debug("Entering.");
+ /*
+ * Find the inode number for the quota file by looking up the filename
+ * $Quota in the extended system files directory $Extend.
+ */
+ inode_lock(vol->extend_ino);
+ mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), Quota, 6,
+ &name);
+ inode_unlock(vol->extend_ino);
+ kfree(name);
+ if (IS_ERR_MREF(mref)) {
+ /*
+ * If the file does not exist, quotas are disabled and have
+ * never been enabled on this volume, just return success.
+ */
+ if (MREF_ERR(mref) == -ENOENT) {
+ ntfs_debug("$Quota not present. Volume does not have quotas enabled.");
+ /*
+ * No need to try to set quotas out of date if they are
+ * not enabled.
+ */
+ NVolSetQuotaOutOfDate(vol);
+ return true;
+ }
+ /* A real error occurred. */
+ ntfs_error(vol->sb, "Failed to find inode number for $Quota.");
+ return false;
+ }
+ /* Get the inode. */
+ tmp_ino = ntfs_iget(vol->sb, MREF(mref));
+ if (IS_ERR(tmp_ino)) {
+ if (!IS_ERR(tmp_ino))
+ iput(tmp_ino);
+ ntfs_error(vol->sb, "Failed to load $Quota.");
+ return false;
+ }
+ vol->quota_ino = tmp_ino;
+ /* Get the $Q index allocation attribute. */
+ tmp_ino = ntfs_index_iget(vol->quota_ino, Q, 2);
+ if (IS_ERR(tmp_ino)) {
+ ntfs_error(vol->sb, "Failed to load $Quota/$Q index.");
+ return false;
+ }
+ vol->quota_q_ino = tmp_ino;
+ ntfs_debug("Done.");
+ return true;
+}
+
+/**
+ * load_and_init_attrdef - load the attribute definitions table for a volume
+ * @vol: ntfs super block describing device whose attrdef to load
+ *
+ * Return 'true' on success or 'false' on error.
+ */
+static bool load_and_init_attrdef(struct ntfs_volume *vol)
+{
+ loff_t i_size;
+ struct super_block *sb = vol->sb;
+ struct inode *ino;
+ struct folio *folio;
+ u8 *addr;
+ pgoff_t index, max_index;
+ unsigned int size;
+
+ ntfs_debug("Entering.");
+ /* Read attrdef table and setup vol->attrdef and vol->attrdef_size. */
+ ino = ntfs_iget(sb, FILE_AttrDef);
+ if (IS_ERR(ino)) {
+ if (!IS_ERR(ino))
+ iput(ino);
+ goto failed;
+ }
+ NInoSetSparseDisabled(NTFS_I(ino));
+ /* The size of FILE_AttrDef must be above 0 and fit inside 31 bits. */
+ i_size = i_size_read(ino);
+ if (i_size <= 0 || i_size > 0x7fffffff)
+ goto iput_failed;
+ vol->attrdef = (struct attr_def *)ntfs_malloc_nofs(i_size);
+ if (!vol->attrdef)
+ goto iput_failed;
+ index = 0;
+ max_index = i_size >> PAGE_SHIFT;
+ size = PAGE_SIZE;
+ while (index < max_index) {
+ /* Read the attrdef table and copy it into the linear buffer. */
+read_partial_attrdef_page:
+ folio = ntfs_read_mapping_folio(ino->i_mapping, index);
+ if (IS_ERR(folio))
+ goto free_iput_failed;
+ addr = kmap_local_folio(folio, 0);
+ memcpy((u8 *)vol->attrdef + (index++ << PAGE_SHIFT),
+ addr, size);
+ ntfs_unmap_folio(folio, addr);
+ }
+ if (size == PAGE_SIZE) {
+ size = i_size & ~PAGE_MASK;
+ if (size)
+ goto read_partial_attrdef_page;
+ }
+ vol->attrdef_size = i_size;
+ ntfs_debug("Read %llu bytes from $AttrDef.", i_size);
+ iput(ino);
+ return true;
+free_iput_failed:
+ ntfs_free(vol->attrdef);
+ vol->attrdef = NULL;
+iput_failed:
+ iput(ino);
+failed:
+ ntfs_error(sb, "Failed to initialize attribute definition table.");
+ return false;
+}
+
+/**
+ * load_and_init_upcase - load the upcase table for an ntfs volume
+ * @vol: ntfs super block describing device whose upcase to load
+ *
+ * Return 'true' on success or 'false' on error.
+ */
+static bool load_and_init_upcase(struct ntfs_volume *vol)
+{
+ loff_t i_size;
+ struct super_block *sb = vol->sb;
+ struct inode *ino;
+ struct folio *folio;
+ u8 *addr;
+ pgoff_t index, max_index;
+ unsigned int size;
+ int i, max;
+
+ ntfs_debug("Entering.");
+ /* Read upcase table and setup vol->upcase and vol->upcase_len. */
+ ino = ntfs_iget(sb, FILE_UpCase);
+ if (IS_ERR(ino)) {
+ if (!IS_ERR(ino))
+ iput(ino);
+ goto upcase_failed;
+ }
+ /*
+ * The upcase size must not be above 64k Unicode characters, must not
+ * be zero and must be a multiple of sizeof(__le16).
+ */
+ i_size = i_size_read(ino);
+ if (!i_size || i_size & (sizeof(__le16) - 1) ||
+ i_size > 64ULL * 1024 * sizeof(__le16))
+ goto iput_upcase_failed;
+ vol->upcase = (__le16 *)ntfs_malloc_nofs(i_size);
+ if (!vol->upcase)
+ goto iput_upcase_failed;
+ index = 0;
+ max_index = i_size >> PAGE_SHIFT;
+ size = PAGE_SIZE;
+ while (index < max_index) {
+ /* Read the upcase table and copy it into the linear buffer. */
+read_partial_upcase_page:
+ folio = ntfs_read_mapping_folio(ino->i_mapping, index);
+ if (IS_ERR(folio))
+ goto iput_upcase_failed;
+ addr = kmap_local_folio(folio, 0);
+ memcpy((char *)vol->upcase + (index++ << PAGE_SHIFT),
+ addr, size);
+ ntfs_unmap_folio(folio, addr);
+ };
+ if (size == PAGE_SIZE) {
+ size = i_size & ~PAGE_MASK;
+ if (size)
+ goto read_partial_upcase_page;
+ }
+ vol->upcase_len = i_size >> UCHAR_T_SIZE_BITS;
+ ntfs_debug("Read %llu bytes from $UpCase (expected %zu bytes).",
+ i_size, 64 * 1024 * sizeof(__le16));
+ iput(ino);
+ mutex_lock(&ntfs_lock);
+ if (!default_upcase) {
+ ntfs_debug("Using volume specified $UpCase since default is not present.");
+ mutex_unlock(&ntfs_lock);
+ return true;
+ }
+ max = default_upcase_len;
+ if (max > vol->upcase_len)
+ max = vol->upcase_len;
+ for (i = 0; i < max; i++)
+ if (vol->upcase[i] != default_upcase[i])
+ break;
+ if (i == max) {
+ ntfs_free(vol->upcase);
+ vol->upcase = default_upcase;
+ vol->upcase_len = max;
+ ntfs_nr_upcase_users++;
+ mutex_unlock(&ntfs_lock);
+ ntfs_debug("Volume specified $UpCase matches default. Using default.");
+ return true;
+ }
+ mutex_unlock(&ntfs_lock);
+ ntfs_debug("Using volume specified $UpCase since it does not match the default.");
+ return true;
+iput_upcase_failed:
+ iput(ino);
+ ntfs_free(vol->upcase);
+ vol->upcase = NULL;
+upcase_failed:
+ mutex_lock(&ntfs_lock);
+ if (default_upcase) {
+ vol->upcase = default_upcase;
+ vol->upcase_len = default_upcase_len;
+ ntfs_nr_upcase_users++;
+ mutex_unlock(&ntfs_lock);
+ ntfs_error(sb, "Failed to load $UpCase from the volume. Using default.");
+ return true;
+ }
+ mutex_unlock(&ntfs_lock);
+ ntfs_error(sb, "Failed to initialize upcase table.");
+ return false;
+}
+
+/*
+ * The lcn and mft bitmap inodes are NTFS-internal inodes with
+ * their own special locking rules:
+ */
+static struct lock_class_key
+ lcnbmp_runlist_lock_key, lcnbmp_mrec_lock_key,
+ mftbmp_runlist_lock_key, mftbmp_mrec_lock_key;
+
+/**
+ * load_system_files - open the system files using normal functions
+ * @vol: ntfs super block describing device whose system files to load
+ *
+ * Open the system files with normal access functions and complete setting up
+ * the ntfs super block @vol.
+ *
+ * Return 'true' on success or 'false' on error.
+ */
+static bool load_system_files(struct ntfs_volume *vol)
+{
+ struct super_block *sb = vol->sb;
+ struct mft_record *m;
+ struct volume_information *vi;
+ struct ntfs_attr_search_ctx *ctx;
+ struct restart_page_header *rp;
+ int err;
+
+ ntfs_debug("Entering.");
+ /* Get mft mirror inode compare the contents of $MFT and $MFTMirr. */
+ if (!load_and_init_mft_mirror(vol) || !check_mft_mirror(vol)) {
+ /* If a read-write mount, convert it to a read-only mount. */
+ if (!sb_rdonly(sb) && vol->on_errors == ON_ERRORS_REMOUNT_RO) {
+ static const char *es1 = "Failed to load $MFTMirr";
+ static const char *es2 = "$MFTMirr does not match $MFT";
+ static const char *es3 = ". Run ntfsck and/or chkdsk.";
+
+ sb->s_flags |= SB_RDONLY;
+ ntfs_error(sb, "%s. Mounting read-only%s",
+ !vol->mftmirr_ino ? es1 : es2, es3);
+ }
+ NVolSetErrors(vol);
+ }
+ /* Get mft bitmap attribute inode. */
+ vol->mftbmp_ino = ntfs_attr_iget(vol->mft_ino, AT_BITMAP, NULL, 0);
+ if (IS_ERR(vol->mftbmp_ino)) {
+ ntfs_error(sb, "Failed to load $MFT/$BITMAP attribute.");
+ goto iput_mirr_err_out;
+ }
+ lockdep_set_class(&NTFS_I(vol->mftbmp_ino)->runlist.lock,
+ &mftbmp_runlist_lock_key);
+ lockdep_set_class(&NTFS_I(vol->mftbmp_ino)->mrec_lock,
+ &mftbmp_mrec_lock_key);
+ /* Read upcase table and setup @vol->upcase and @vol->upcase_len. */
+ if (!load_and_init_upcase(vol))
+ goto iput_mftbmp_err_out;
+ /*
+ * Read attribute definitions table and setup @vol->attrdef and
+ * @vol->attrdef_size.
+ */
+ if (!load_and_init_attrdef(vol))
+ goto iput_upcase_err_out;
+ /*
+ * Get the cluster allocation bitmap inode and verify the size, no
+ * need for any locking at this stage as we are already running
+ * exclusively as we are mount in progress task.
+ */
+ vol->lcnbmp_ino = ntfs_iget(sb, FILE_Bitmap);
+ if (IS_ERR(vol->lcnbmp_ino)) {
+ if (!IS_ERR(vol->lcnbmp_ino))
+ iput(vol->lcnbmp_ino);
+ goto bitmap_failed;
+ }
+ lockdep_set_class(&NTFS_I(vol->lcnbmp_ino)->runlist.lock,
+ &lcnbmp_runlist_lock_key);
+ lockdep_set_class(&NTFS_I(vol->lcnbmp_ino)->mrec_lock,
+ &lcnbmp_mrec_lock_key);
+
+ NInoSetSparseDisabled(NTFS_I(vol->lcnbmp_ino));
+ if ((vol->nr_clusters + 7) >> 3 > i_size_read(vol->lcnbmp_ino)) {
+ iput(vol->lcnbmp_ino);
+bitmap_failed:
+ ntfs_error(sb, "Failed to load $Bitmap.");
+ goto iput_attrdef_err_out;
+ }
+ /*
+ * Get the volume inode and setup our cache of the volume flags and
+ * version.
+ */
+ vol->vol_ino = ntfs_iget(sb, FILE_Volume);
+ if (IS_ERR(vol->vol_ino)) {
+ if (!IS_ERR(vol->vol_ino))
+ iput(vol->vol_ino);
+volume_failed:
+ ntfs_error(sb, "Failed to load $Volume.");
+ goto iput_lcnbmp_err_out;
+ }
+ m = map_mft_record(NTFS_I(vol->vol_ino));
+ if (IS_ERR(m)) {
+iput_volume_failed:
+ iput(vol->vol_ino);
+ goto volume_failed;
+ }
+
+ ctx = ntfs_attr_get_search_ctx(NTFS_I(vol->vol_ino), m);
+ if (!ctx) {
+ ntfs_error(sb, "Failed to get attribute search context.");
+ goto get_ctx_vol_failed;
+ }
+ if (ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0,
+ ctx) || ctx->attr->non_resident || ctx->attr->flags) {
+err_put_vol:
+ ntfs_attr_put_search_ctx(ctx);
+get_ctx_vol_failed:
+ unmap_mft_record(NTFS_I(vol->vol_ino));
+ goto iput_volume_failed;
+ }
+ vi = (struct volume_information *)((char *)ctx->attr +
+ le16_to_cpu(ctx->attr->data.resident.value_offset));
+ /* Some bounds checks. */
+ if ((u8 *)vi < (u8 *)ctx->attr || (u8 *)vi +
+ le32_to_cpu(ctx->attr->data.resident.value_length) >
+ (u8 *)ctx->attr + le32_to_cpu(ctx->attr->length))
+ goto err_put_vol;
+ /* Copy the volume flags and version to the struct ntfs_volume structure. */
+ vol->vol_flags = vi->flags;
+ vol->major_ver = vi->major_ver;
+ vol->minor_ver = vi->minor_ver;
+ ntfs_attr_put_search_ctx(ctx);
+ unmap_mft_record(NTFS_I(vol->vol_ino));
+ pr_info("volume version %i.%i, dev %s, cluster size %d\n",
+ vol->major_ver, vol->minor_ver, sb->s_id, vol->cluster_size);
+
+ /* Make sure that no unsupported volume flags are set. */
+ if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) {
+ static const char *es1a = "Volume is dirty";
+ static const char *es1b = "Volume has been modified by chkdsk";
+ static const char *es1c = "Volume has unsupported flags set";
+ static const char *es2a = ". Run chkdsk and mount in Windows.";
+ static const char *es2b = ". Mount in Windows.";
+ const char *es1, *es2;
+
+ es2 = es2a;
+ if (vol->vol_flags & VOLUME_IS_DIRTY)
+ es1 = es1a;
+ else if (vol->vol_flags & VOLUME_MODIFIED_BY_CHKDSK) {
+ es1 = es1b;
+ es2 = es2b;
+ } else {
+ es1 = es1c;
+ ntfs_warning(sb, "Unsupported volume flags 0x%x encountered.",
+ (unsigned int)le16_to_cpu(vol->vol_flags));
+ }
+ /* If a read-write mount, convert it to a read-only mount. */
+ if (!sb_rdonly(sb) && vol->on_errors == ON_ERRORS_REMOUNT_RO) {
+ sb->s_flags |= SB_RDONLY;
+ ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
+ }
+ /*
+ * Do not set NVolErrors() because ntfs_remount() re-checks the
+ * flags which we need to do in case any flags have changed.
+ */
+ }
+ /*
+ * Get the inode for the logfile, check it and determine if the volume
+ * was shutdown cleanly.
+ */
+ rp = NULL;
+ err = load_and_check_logfile(vol, &rp);
+ if (err) {
+ /* If a read-write mount, convert it to a read-only mount. */
+ if (!sb_rdonly(sb) && vol->on_errors == ON_ERRORS_REMOUNT_RO) {
+ sb->s_flags |= SB_RDONLY;
+ ntfs_error(sb, "Failed to load LogFile. Mounting read-only.");
+ }
+ NVolSetErrors(vol);
+ }
+
+ ntfs_free(rp);
+ /* Get the root directory inode so we can do path lookups. */
+ vol->root_ino = ntfs_iget(sb, FILE_root);
+ if (IS_ERR(vol->root_ino)) {
+ if (!IS_ERR(vol->root_ino))
+ iput(vol->root_ino);
+ ntfs_error(sb, "Failed to load root directory.");
+ goto iput_logfile_err_out;
+ }
+ /*
+ * Check if Windows is suspended to disk on the target volume. If it
+ * is hibernated, we must not write *anything* to the disk so set
+ * NVolErrors() without setting the dirty volume flag and mount
+ * read-only. This will prevent read-write remounting and it will also
+ * prevent all writes.
+ */
+ err = check_windows_hibernation_status(vol);
+ if (unlikely(err)) {
+ static const char *es1a = "Failed to determine if Windows is hibernated";
+ static const char *es1b = "Windows is hibernated";
+ static const char *es2 = ". Run chkdsk.";
+ const char *es1;
+
+ es1 = err < 0 ? es1a : es1b;
+ /* If a read-write mount, convert it to a read-only mount. */
+ if (!sb_rdonly(sb) && vol->on_errors == ON_ERRORS_REMOUNT_RO) {
+ sb->s_flags |= SB_RDONLY;
+ ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
+ }
+ NVolSetErrors(vol);
+ }
+
+ /* If (still) a read-write mount, empty the logfile. */
+ if (!sb_rdonly(sb) &&
+ vol->logfile_ino && !ntfs_empty_logfile(vol->logfile_ino) &&
+ vol->on_errors == ON_ERRORS_REMOUNT_RO) {
+ static const char *es1 = "Failed to empty LogFile";
+ static const char *es2 = ". Mount in Windows.";
+
+ /* Convert to a read-only mount. */
+ ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
+ sb->s_flags |= SB_RDONLY;
+ NVolSetErrors(vol);
+ }
+ /* If on NTFS versions before 3.0, we are done. */
+ if (unlikely(vol->major_ver < 3))
+ return true;
+ /* NTFS 3.0+ specific initialization. */
+ /* Get the security descriptors inode. */
+ vol->secure_ino = ntfs_iget(sb, FILE_Secure);
+ if (IS_ERR(vol->secure_ino)) {
+ if (!IS_ERR(vol->secure_ino))
+ iput(vol->secure_ino);
+ ntfs_error(sb, "Failed to load $Secure.");
+ goto iput_root_err_out;
+ }
+ /* Get the extended system files' directory inode. */
+ vol->extend_ino = ntfs_iget(sb, FILE_Extend);
+ if (IS_ERR(vol->extend_ino) ||
+ !S_ISDIR(vol->extend_ino->i_mode)) {
+ if (!IS_ERR(vol->extend_ino))
+ iput(vol->extend_ino);
+ ntfs_error(sb, "Failed to load $Extend.");
+ goto iput_sec_err_out;
+ }
+ /* Find the quota file, load it if present, and set it up. */
+ if (!load_and_init_quota(vol) &&
+ vol->on_errors == ON_ERRORS_REMOUNT_RO) {
+ static const char *es1 = "Failed to load $Quota";
+ static const char *es2 = ". Run chkdsk.";
+
+ sb->s_flags |= SB_RDONLY;
+ ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
+ /* This will prevent a read-write remount. */
+ NVolSetErrors(vol);
+ }
+
+ return true;
+
+iput_sec_err_out:
+ iput(vol->secure_ino);
+iput_root_err_out:
+ iput(vol->root_ino);
+iput_logfile_err_out:
+ if (vol->logfile_ino)
+ iput(vol->logfile_ino);
+ iput(vol->vol_ino);
+iput_lcnbmp_err_out:
+ iput(vol->lcnbmp_ino);
+iput_attrdef_err_out:
+ vol->attrdef_size = 0;
+ if (vol->attrdef) {
+ ntfs_free(vol->attrdef);
+ vol->attrdef = NULL;
+ }
+iput_upcase_err_out:
+ vol->upcase_len = 0;
+ mutex_lock(&ntfs_lock);
+ if (vol->upcase == default_upcase) {
+ ntfs_nr_upcase_users--;
+ vol->upcase = NULL;
+ }
+ mutex_unlock(&ntfs_lock);
+ if (vol->upcase) {
+ ntfs_free(vol->upcase);
+ vol->upcase = NULL;
+ }
+iput_mftbmp_err_out:
+ iput(vol->mftbmp_ino);
+iput_mirr_err_out:
+ iput(vol->mftmirr_ino);
+ return false;
+}
+
+static void ntfs_volume_free(struct ntfs_volume *vol)
+{
+ /* Throw away the table of attribute definitions. */
+ vol->attrdef_size = 0;
+ if (vol->attrdef) {
+ ntfs_free(vol->attrdef);
+ vol->attrdef = NULL;
+ }
+ vol->upcase_len = 0;
+ /*
+ * Destroy the global default upcase table if necessary. Also decrease
+ * the number of upcase users if we are a user.
+ */
+ mutex_lock(&ntfs_lock);
+ if (vol->upcase == default_upcase) {
+ ntfs_nr_upcase_users--;
+ vol->upcase = NULL;
+ }
+
+ if (!ntfs_nr_upcase_users && default_upcase) {
+ ntfs_free(default_upcase);
+ default_upcase = NULL;
+ }
+
+ free_compression_buffers();
+
+ mutex_unlock(&ntfs_lock);
+ if (vol->upcase) {
+ ntfs_free(vol->upcase);
+ vol->upcase = NULL;
+ }
+
+ unload_nls(vol->nls_map);
+
+ if (vol->lcn_empty_bits_per_page)
+ kvfree(vol->lcn_empty_bits_per_page);
+ kfree(vol);
+}
+
+/**
+ * ntfs_put_super - called by the vfs to unmount a volume
+ * @sb: vfs superblock of volume to unmount
+ */
+static void ntfs_put_super(struct super_block *sb)
+{
+ struct ntfs_volume *vol = NTFS_SB(sb);
+
+ pr_info("Entering %s, dev %s\n", __func__, sb->s_id);
+
+ cancel_work_sync(&vol->precalc_work);
+
+ /*
+ * Commit all inodes while they are still open in case some of them
+ * cause others to be dirtied.
+ */
+ ntfs_commit_inode(vol->vol_ino);
+
+ /* NTFS 3.0+ specific. */
+ if (vol->major_ver >= 3) {
+ if (vol->quota_q_ino)
+ ntfs_commit_inode(vol->quota_q_ino);
+ if (vol->quota_ino)
+ ntfs_commit_inode(vol->quota_ino);
+ if (vol->extend_ino)
+ ntfs_commit_inode(vol->extend_ino);
+ if (vol->secure_ino)
+ ntfs_commit_inode(vol->secure_ino);
+ }
+
+ ntfs_commit_inode(vol->root_ino);
+
+ ntfs_commit_inode(vol->lcnbmp_ino);
+
+ /*
+ * the GFP_NOFS scope is not needed because ntfs_commit_inode
+ * does nothing
+ */
+ ntfs_commit_inode(vol->mftbmp_ino);
+
+ if (vol->logfile_ino)
+ ntfs_commit_inode(vol->logfile_ino);
+
+ if (vol->mftmirr_ino)
+ ntfs_commit_inode(vol->mftmirr_ino);
+ ntfs_commit_inode(vol->mft_ino);
+
+ /*
+ * If a read-write mount and no volume errors have occurred, mark the
+ * volume clean. Also, re-commit all affected inodes.
+ */
+ if (!sb_rdonly(sb)) {
+ if (!NVolErrors(vol)) {
+ if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY))
+ ntfs_warning(sb,
+ "Failed to clear dirty bit in volume information flags. Run chkdsk.");
+ ntfs_commit_inode(vol->vol_ino);
+ ntfs_commit_inode(vol->root_ino);
+ if (vol->mftmirr_ino)
+ ntfs_commit_inode(vol->mftmirr_ino);
+ ntfs_commit_inode(vol->mft_ino);
+ } else {
+ ntfs_warning(sb,
+ "Volume has errors. Leaving volume marked dirty. Run chkdsk.");
+ }
+ }
+
+ iput(vol->vol_ino);
+ vol->vol_ino = NULL;
+
+ /* NTFS 3.0+ specific clean up. */
+ if (vol->major_ver >= 3) {
+ if (vol->quota_q_ino) {
+ iput(vol->quota_q_ino);
+ vol->quota_q_ino = NULL;
+ }
+ if (vol->quota_ino) {
+ iput(vol->quota_ino);
+ vol->quota_ino = NULL;
+ }
+ if (vol->extend_ino) {
+ iput(vol->extend_ino);
+ vol->extend_ino = NULL;
+ }
+ if (vol->secure_ino) {
+ iput(vol->secure_ino);
+ vol->secure_ino = NULL;
+ }
+ }
+
+ iput(vol->root_ino);
+ vol->root_ino = NULL;
+
+ iput(vol->lcnbmp_ino);
+ vol->lcnbmp_ino = NULL;
+
+ iput(vol->mftbmp_ino);
+ vol->mftbmp_ino = NULL;
+
+ if (vol->logfile_ino) {
+ iput(vol->logfile_ino);
+ vol->logfile_ino = NULL;
+ }
+ if (vol->mftmirr_ino) {
+ /* Re-commit the mft mirror and mft just in case. */
+ ntfs_commit_inode(vol->mftmirr_ino);
+ ntfs_commit_inode(vol->mft_ino);
+ iput(vol->mftmirr_ino);
+ vol->mftmirr_ino = NULL;
+ }
+ /*
+ * We should have no dirty inodes left, due to
+ * mft.c::ntfs_mft_writepage() cleaning all the dirty pages as
+ * the underlying mft records are written out and cleaned.
+ */
+ ntfs_commit_inode(vol->mft_ino);
+ write_inode_now(vol->mft_ino, 1);
+
+ iput(vol->mft_ino);
+ vol->mft_ino = NULL;
+
+ ntfs_volume_free(vol);
+}
+
+int ntfs_force_shutdown(struct super_block *sb, u32 flags)
+{
+ struct ntfs_volume *vol = NTFS_SB(sb);
+ int ret;
+
+ if (NVolShutdown(vol))
+ return 0;
+
+ switch (flags) {
+ case NTFS_GOING_DOWN_DEFAULT:
+ case NTFS_GOING_DOWN_FULLSYNC:
+ ret = bdev_freeze(sb->s_bdev);
+ if (ret)
+ return ret;
+ bdev_thaw(sb->s_bdev);
+ NVolSetShutdown(vol);
+ break;
+ case NTFS_GOING_DOWN_NOSYNC:
+ NVolSetShutdown(vol);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void ntfs_shutdown(struct super_block *sb)
+{
+ ntfs_force_shutdown(sb, NTFS_GOING_DOWN_NOSYNC);
+
+}
+
+static int ntfs_sync_fs(struct super_block *sb, int wait)
+{
+ struct ntfs_volume *vol = NTFS_SB(sb);
+ int err = 0;
+
+ if (NVolShutdown(vol))
+ return -EIO;
+
+ if (!wait)
+ return 0;
+
+ /* If there are some dirty buffers in the bdev inode */
+ if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY)) {
+ ntfs_warning(sb, "Failed to clear dirty bit in volume information flags. Run chkdsk.");
+ err = -EIO;
+ }
+ sync_inodes_sb(sb);
+ sync_blockdev(sb->s_bdev);
+ blkdev_issue_flush(sb->s_bdev);
+ return err;
+}
+
+/**
+ * get_nr_free_clusters - return the number of free clusters on a volume
+ * @vol: ntfs volume for which to obtain free cluster count
+ *
+ * Calculate the number of free clusters on the mounted NTFS volume @vol. We
+ * actually calculate the number of clusters in use instead because this
+ * allows us to not care about partial pages as these will be just zero filled
+ * and hence not be counted as allocated clusters.
+ *
+ * The only particularity is that clusters beyond the end of the logical ntfs
+ * volume will be marked as allocated to prevent errors which means we have to
+ * discount those at the end. This is important as the cluster bitmap always
+ * has a size in multiples of 8 bytes, i.e. up to 63 clusters could be outside
+ * the logical volume and marked in use when they are not as they do not exist.
+ *
+ * If any pages cannot be read we assume all clusters in the erroring pages are
+ * in use. This means we return an underestimate on errors which is better than
+ * an overestimate.
+ */
+s64 get_nr_free_clusters(struct ntfs_volume *vol)
+{
+ s64 nr_free = vol->nr_clusters;
+ u32 nr_used;
+ struct address_space *mapping = vol->lcnbmp_ino->i_mapping;
+ struct folio *folio;
+ pgoff_t index, max_index;
+ struct file_ra_state *ra;
+
+ ntfs_debug("Entering.");
+ /* Serialize accesses to the cluster bitmap. */
+
+ if (NVolFreeClusterKnown(vol))
+ return atomic64_read(&vol->free_clusters);
+
+ ra = kzalloc(sizeof(*ra), GFP_NOFS);
+ if (!ra)
+ return 0;
+
+ file_ra_state_init(ra, mapping);
+
+ /*
+ * Convert the number of bits into bytes rounded up, then convert into
+ * multiples of PAGE_SIZE, rounding up so that if we have one
+ * full and one partial page max_index = 2.
+ */
+ max_index = (((vol->nr_clusters + 7) >> 3) + PAGE_SIZE - 1) >>
+ PAGE_SHIFT;
+ /* Use multiples of 4 bytes, thus max_size is PAGE_SIZE / 4. */
+ ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%lx.",
+ max_index, PAGE_SIZE / 4);
+ for (index = 0; index < max_index; index++) {
+ unsigned long *kaddr;
+
+ /*
+ * Get folio from page cache, getting it from backing store
+ * if necessary, and increment the use count.
+ */
+ folio = filemap_lock_folio(mapping, index);
+ if (IS_ERR(folio)) {
+ page_cache_sync_readahead(mapping, ra, NULL,
+ index, max_index - index);
+ folio = ntfs_read_mapping_folio(mapping, index);
+ if (!IS_ERR(folio))
+ folio_lock(folio);
+ }
+
+ /* Ignore pages which errored synchronously. */
+ if (IS_ERR(folio)) {
+ ntfs_debug("Skipping page (index 0x%lx).", index);
+ nr_free -= PAGE_SIZE * 8;
+ vol->lcn_empty_bits_per_page[index] = 0;
+ continue;
+ }
+
+ kaddr = kmap_local_folio(folio, 0);
+ /*
+ * Subtract the number of set bits. If this
+ * is the last page and it is partial we don't really care as
+ * it just means we do a little extra work but it won't affect
+ * the result as all out of range bytes are set to zero by
+ * ntfs_readpage().
+ */
+ nr_used = bitmap_weight(kaddr, PAGE_SIZE * BITS_PER_BYTE);
+ nr_free -= nr_used;
+ vol->lcn_empty_bits_per_page[index] = PAGE_SIZE * BITS_PER_BYTE - nr_used;
+ kunmap_local(kaddr);
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+ ntfs_debug("Finished reading $Bitmap, last index = 0x%lx.", index - 1);
+ /*
+ * Fixup for eventual bits outside logical ntfs volume (see function
+ * description above).
+ */
+ if (vol->nr_clusters & 63)
+ nr_free += 64 - (vol->nr_clusters & 63);
+
+ /* If errors occurred we may well have gone below zero, fix this. */
+ if (nr_free < 0)
+ nr_free = 0;
+ else
+ atomic64_set(&vol->free_clusters, nr_free);
+
+ kfree(ra);
+ NVolSetFreeClusterKnown(vol);
+ wake_up_all(&vol->free_waitq);
+ ntfs_debug("Exiting.");
+ return nr_free;
+}
+
+/*
+ * @nr_clusters is the number of clusters requested for allocation.
+ *
+ * Return the number of clusters available for allocation within
+ * the range of @nr_clusters, which is counts that considered
+ * for delayed allocation.
+ */
+s64 ntfs_available_clusters_count(struct ntfs_volume *vol, s64 nr_clusters)
+{
+ s64 free_clusters;
+
+ /* wait event */
+ if (!NVolFreeClusterKnown(vol))
+ wait_event(vol->free_waitq, NVolFreeClusterKnown(vol));
+
+ free_clusters = atomic64_read(&vol->free_clusters) -
+ atomic64_read(&vol->dirty_clusters);
+ if (free_clusters <= 0)
+ return -ENOSPC;
+ else if (free_clusters < nr_clusters)
+ nr_clusters = free_clusters;
+
+ return nr_clusters;
+}
+
+/**
+ * __get_nr_free_mft_records - return the number of free inodes on a volume
+ * @vol: ntfs volume for which to obtain free inode count
+ * @nr_free: number of mft records in filesystem
+ * @max_index: maximum number of pages containing set bits
+ *
+ * Calculate the number of free mft records (inodes) on the mounted NTFS
+ * volume @vol. We actually calculate the number of mft records in use instead
+ * because this allows us to not care about partial pages as these will be just
+ * zero filled and hence not be counted as allocated mft record.
+ *
+ * If any pages cannot be read we assume all mft records in the erroring pages
+ * are in use. This means we return an underestimate on errors which is better
+ * than an overestimate.
+ *
+ * NOTE: Caller must hold mftbmp_lock rw_semaphore for reading or writing.
+ */
+static unsigned long __get_nr_free_mft_records(struct ntfs_volume *vol,
+ s64 nr_free, const pgoff_t max_index)
+{
+ struct address_space *mapping = vol->mftbmp_ino->i_mapping;
+ struct folio *folio;
+ pgoff_t index;
+ struct file_ra_state *ra;
+
+ ntfs_debug("Entering.");
+
+ ra = kzalloc(sizeof(*ra), GFP_NOFS);
+ if (!ra)
+ return 0;
+
+ file_ra_state_init(ra, mapping);
+
+ /* Use multiples of 4 bytes, thus max_size is PAGE_SIZE / 4. */
+ ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = 0x%lx.",
+ max_index, PAGE_SIZE / 4);
+ for (index = 0; index < max_index; index++) {
+ unsigned long *kaddr;
+
+ /*
+ * Get folio from page cache, getting it from backing store
+ * if necessary, and increment the use count.
+ */
+ folio = filemap_lock_folio(mapping, index);
+ if (IS_ERR(folio)) {
+ page_cache_sync_readahead(mapping, ra, NULL,
+ index, max_index - index);
+ folio = ntfs_read_mapping_folio(mapping, index);
+ if (!IS_ERR(folio))
+ folio_lock(folio);
+ }
+
+ /* Ignore pages which errored synchronously. */
+ if (IS_ERR(folio)) {
+ ntfs_debug("read_mapping_page() error. Skipping page (index 0x%lx).",
+ index);
+ nr_free -= PAGE_SIZE * 8;
+ continue;
+ }
+
+ kaddr = kmap_local_folio(folio, 0);
+ /*
+ * Subtract the number of set bits. If this
+ * is the last page and it is partial we don't really care as
+ * it just means we do a little extra work but it won't affect
+ * the result as all out of range bytes are set to zero by
+ * ntfs_readpage().
+ */
+ nr_free -= bitmap_weight(kaddr,
+ PAGE_SIZE * BITS_PER_BYTE);
+ kunmap_local(kaddr);
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+ ntfs_debug("Finished reading $MFT/$BITMAP, last index = 0x%lx.",
+ index - 1);
+ /* If errors occurred we may well have gone below zero, fix this. */
+ if (nr_free < 0)
+ nr_free = 0;
+ else
+ atomic64_set(&vol->free_mft_records, nr_free);
+
+ kfree(ra);
+ ntfs_debug("Exiting.");
+ return nr_free;
+}
+
+/**
+ * ntfs_statfs - return information about mounted NTFS volume
+ * @dentry: dentry from mounted volume
+ * @sfs: statfs structure in which to return the information
+ *
+ * Return information about the mounted NTFS volume @dentry in the statfs structure
+ * pointed to by @sfs (this is initialized with zeros before ntfs_statfs is
+ * called). We interpret the values to be correct of the moment in time at
+ * which we are called. Most values are variable otherwise and this isn't just
+ * the free values but the totals as well. For example we can increase the
+ * total number of file nodes if we run out and we can keep doing this until
+ * there is no more space on the volume left at all.
+ *
+ * Called from vfs_statfs which is used to handle the statfs, fstatfs, and
+ * ustat system calls.
+ *
+ * Return 0 on success or -errno on error.
+ */
+static int ntfs_statfs(struct dentry *dentry, struct kstatfs *sfs)
+{
+ struct super_block *sb = dentry->d_sb;
+ s64 size;
+ struct ntfs_volume *vol = NTFS_SB(sb);
+ struct ntfs_inode *mft_ni = NTFS_I(vol->mft_ino);
+ unsigned long flags;
+
+ ntfs_debug("Entering.");
+ /* Type of filesystem. */
+ sfs->f_type = NTFS_SB_MAGIC;
+ /* Optimal transfer block size. */
+ sfs->f_bsize = vol->cluster_size;
+ /* Fundamental file system block size, used as the unit. */
+ sfs->f_frsize = vol->cluster_size;
+
+ /*
+ * Total data blocks in filesystem in units of f_bsize and since
+ * inodes are also stored in data blocs ($MFT is a file) this is just
+ * the total clusters.
+ */
+ sfs->f_blocks = vol->nr_clusters;
+
+ /* wait event */
+ if (!NVolFreeClusterKnown(vol))
+ wait_event(vol->free_waitq, NVolFreeClusterKnown(vol));
+
+ /* Free data blocks in filesystem in units of f_bsize. */
+ size = atomic64_read(&vol->free_clusters) -
+ atomic64_read(&vol->dirty_clusters);
+ if (size < 0LL)
+ size = 0LL;
+
+ /* Free blocks avail to non-superuser, same as above on NTFS. */
+ sfs->f_bavail = sfs->f_bfree = size;
+
+ /* Number of inodes in filesystem (at this point in time). */
+ read_lock_irqsave(&mft_ni->size_lock, flags);
+ sfs->f_files = i_size_read(vol->mft_ino) >> vol->mft_record_size_bits;
+ read_unlock_irqrestore(&mft_ni->size_lock, flags);
+
+ /* Free inodes in fs (based on current total count). */
+ sfs->f_ffree = atomic64_read(&vol->free_mft_records);
+
+ /*
+ * File system id. This is extremely *nix flavour dependent and even
+ * within Linux itself all fs do their own thing. I interpret this to
+ * mean a unique id associated with the mounted fs and not the id
+ * associated with the filesystem driver, the latter is already given
+ * by the filesystem type in sfs->f_type. Thus we use the 64-bit
+ * volume serial number splitting it into two 32-bit parts. We enter
+ * the least significant 32-bits in f_fsid[0] and the most significant
+ * 32-bits in f_fsid[1].
+ */
+ sfs->f_fsid = u64_to_fsid(vol->serial_no);
+ /* Maximum length of filenames. */
+ sfs->f_namelen = NTFS_MAX_NAME_LEN;
+
+ return 0;
+}
+
+static int ntfs_write_inode(struct inode *vi, struct writeback_control *wbc)
+{
+ return __ntfs_write_inode(vi, wbc->sync_mode == WB_SYNC_ALL);
+}
+
+/**
+ * The complete super operations.
+ */
+static const struct super_operations ntfs_sops = {
+ .alloc_inode = ntfs_alloc_big_inode, /* VFS: Allocate new inode. */
+ .free_inode = ntfs_free_big_inode, /* VFS: Deallocate inode. */
+ .drop_inode = ntfs_drop_big_inode,
+ .write_inode = ntfs_write_inode, /* VFS: Write dirty inode to disk. */
+ .put_super = ntfs_put_super, /* Syscall: umount. */
+ .shutdown = ntfs_shutdown,
+ .sync_fs = ntfs_sync_fs, /* Syscall: sync. */
+ .statfs = ntfs_statfs, /* Syscall: statfs */
+ .evict_inode = ntfs_evict_big_inode,
+ .show_options = ntfs_show_options, /* Show mount options in proc. */
+};
+
+static void precalc_free_clusters(struct work_struct *work)
+{
+ struct ntfs_volume *vol = container_of(work, struct ntfs_volume, precalc_work);
+ s64 nr_free;
+
+ nr_free = get_nr_free_clusters(vol);
+
+ ntfs_debug("pre-calculate free clusters(%lld) using workqueue",
+ nr_free);
+}
+
+/**
+ * ntfs_fill_super - mount an ntfs filesystem
+ *
+ * ntfs_fill_super() is called by the VFS to mount the device described by @sb
+ * with the mount otions in @data with the NTFS filesystem.
+ *
+ * If @silent is true, remain silent even if errors are detected. This is used
+ * during bootup, when the kernel tries to mount the root filesystem with all
+ * registered filesystems one after the other until one succeeds. This implies
+ * that all filesystems except the correct one will quite correctly and
+ * expectedly return an error, but nobody wants to see error messages when in
+ * fact this is what is supposed to happen.
+ */
+static struct lock_class_key ntfs_mft_inval_lock_key;
+
+static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
+{
+ char *boot;
+ struct inode *tmp_ino;
+ int blocksize, result;
+ pgoff_t lcn_bit_pages;
+ struct ntfs_volume *vol = NTFS_SB(sb);
+ int silent = fc->sb_flags & SB_SILENT;
+
+ vol->sb = sb;
+
+ /*
+ * We do a pretty difficult piece of bootstrap by reading the
+ * MFT (and other metadata) from disk into memory. We'll only
+ * release this metadata during umount, so the locking patterns
+ * observed during bootstrap do not count. So turn off the
+ * observation of locking patterns (strictly for this context
+ * only) while mounting NTFS. [The validator is still active
+ * otherwise, even for this context: it will for example record
+ * lock class registrations.]
+ */
+ lockdep_off();
+ ntfs_debug("Entering.");
+
+ if (vol->nls_map && !strcmp(vol->nls_map->charset, "utf8"))
+ vol->nls_utf8 = true;
+
+ /* We support sector sizes up to the PAGE_SIZE. */
+ if (bdev_logical_block_size(sb->s_bdev) > PAGE_SIZE) {
+ if (!silent)
+ ntfs_error(sb,
+ "Device has unsupported sector size (%i). The maximum supported sector size on this architecture is %lu bytes.",
+ bdev_logical_block_size(sb->s_bdev),
+ PAGE_SIZE);
+ goto err_out_now;
+ }
+
+ /*
+ * Setup the device access block size to NTFS_BLOCK_SIZE or the hard
+ * sector size, whichever is bigger.
+ */
+ blocksize = sb_min_blocksize(sb, NTFS_BLOCK_SIZE);
+ if (blocksize < NTFS_BLOCK_SIZE) {
+ if (!silent)
+ ntfs_error(sb, "Unable to set device block size.");
+ goto err_out_now;
+ }
+
+ BUG_ON(blocksize != sb->s_blocksize);
+ ntfs_debug("Set device block size to %i bytes (block size bits %i).",
+ blocksize, sb->s_blocksize_bits);
+ /* Determine the size of the device in units of block_size bytes. */
+ if (!bdev_nr_bytes(sb->s_bdev)) {
+ if (!silent)
+ ntfs_error(sb, "Unable to determine device size.");
+ goto err_out_now;
+ }
+ vol->nr_blocks = bdev_nr_bytes(sb->s_bdev) >>
+ sb->s_blocksize_bits;
+ /* Read the boot sector and return unlocked buffer head to it. */
+ boot = read_ntfs_boot_sector(sb, silent);
+ if (!boot) {
+ if (!silent)
+ ntfs_error(sb, "Not an NTFS volume.");
+ goto err_out_now;
+ }
+ /*
+ * Extract the data from the boot sector and setup the ntfs volume
+ * using it.
+ */
+ result = parse_ntfs_boot_sector(vol, (struct ntfs_boot_sector *)boot);
+ kfree(boot);
+ if (!result) {
+ if (!silent)
+ ntfs_error(sb, "Unsupported NTFS filesystem.");
+ goto err_out_now;
+ }
+
+ if (vol->sector_size > blocksize) {
+ blocksize = sb_set_blocksize(sb, vol->sector_size);
+ if (blocksize != vol->sector_size) {
+ if (!silent)
+ ntfs_error(sb,
+ "Unable to set device block size to sector size (%i).",
+ vol->sector_size);
+ goto err_out_now;
+ }
+ BUG_ON(blocksize != sb->s_blocksize);
+ vol->nr_blocks = bdev_nr_bytes(sb->s_bdev) >>
+ sb->s_blocksize_bits;
+ ntfs_debug("Changed device block size to %i bytes (block size bits %i) to match volume sector size.",
+ blocksize, sb->s_blocksize_bits);
+ }
+ /* Initialize the cluster and mft allocators. */
+ ntfs_setup_allocators(vol);
+ /* Setup remaining fields in the super block. */
+ sb->s_magic = NTFS_SB_MAGIC;
+ /*
+ * Ntfs allows 63 bits for the file size, i.e. correct would be:
+ * sb->s_maxbytes = ~0ULL >> 1;
+ * But the kernel uses a long as the page cache page index which on
+ * 32-bit architectures is only 32-bits. MAX_LFS_FILESIZE is kernel
+ * defined to the maximum the page cache page index can cope with
+ * without overflowing the index or to 2^63 - 1, whichever is smaller.
+ */
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ /* Ntfs measures time in 100ns intervals. */
+ sb->s_time_gran = 100;
+
+ sb->s_xattr = ntfs_xattr_handlers;
+ /*
+ * Now load the metadata required for the page cache and our address
+ * space operations to function. We do this by setting up a specialised
+ * read_inode method and then just calling the normal iget() to obtain
+ * the inode for $MFT which is sufficient to allow our normal inode
+ * operations and associated address space operations to function.
+ */
+ sb->s_op = &ntfs_sops;
+ tmp_ino = new_inode(sb);
+ if (!tmp_ino) {
+ if (!silent)
+ ntfs_error(sb, "Failed to load essential metadata.");
+ goto err_out_now;
+ }
+
+ tmp_ino->i_ino = FILE_MFT;
+ insert_inode_hash(tmp_ino);
+ if (ntfs_read_inode_mount(tmp_ino) < 0) {
+ if (!silent)
+ ntfs_error(sb, "Failed to load essential metadata.");
+ goto iput_tmp_ino_err_out_now;
+ }
+ lockdep_set_class(&tmp_ino->i_mapping->invalidate_lock,
+ &ntfs_mft_inval_lock_key);
+
+ mutex_lock(&ntfs_lock);
+
+ /*
+ * Generate the global default upcase table if necessary. Also
+ * temporarily increment the number of upcase users to avoid race
+ * conditions with concurrent (u)mounts.
+ */
+ if (!default_upcase)
+ default_upcase = generate_default_upcase();
+ ntfs_nr_upcase_users++;
+ mutex_unlock(&ntfs_lock);
+
+ lcn_bit_pages = (((vol->nr_clusters + 7) >> 3) + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ vol->lcn_empty_bits_per_page = kvmalloc_array(lcn_bit_pages, sizeof(unsigned int),
+ GFP_KERNEL);
+ if (!vol->lcn_empty_bits_per_page) {
+ ntfs_error(sb,
+ "Unable to allocate pages for storing LCN empty bit counts\n");
+ goto unl_upcase_iput_tmp_ino_err_out_now;
+ }
+
+ /*
+ * From now on, ignore @silent parameter. If we fail below this line,
+ * it will be due to a corrupt fs or a system error, so we report it.
+ */
+ /*
+ * Open the system files with normal access functions and complete
+ * setting up the ntfs super block.
+ */
+ if (!load_system_files(vol)) {
+ ntfs_error(sb, "Failed to load system files.");
+ goto unl_upcase_iput_tmp_ino_err_out_now;
+ }
+
+ /* We grab a reference, simulating an ntfs_iget(). */
+ ihold(vol->root_ino);
+ sb->s_root = d_make_root(vol->root_ino);
+ if (sb->s_root) {
+ s64 nr_records;
+
+ ntfs_debug("Exiting, status successful.");
+
+ /* Release the default upcase if it has no users. */
+ mutex_lock(&ntfs_lock);
+ if (!--ntfs_nr_upcase_users && default_upcase) {
+ ntfs_free(default_upcase);
+ default_upcase = NULL;
+ }
+ mutex_unlock(&ntfs_lock);
+ sb->s_export_op = &ntfs_export_ops;
+ lockdep_on();
+
+ nr_records = __get_nr_free_mft_records(vol,
+ i_size_read(vol->mft_ino) >> vol->mft_record_size_bits,
+ ((((NTFS_I(vol->mft_ino)->initialized_size >>
+ vol->mft_record_size_bits) +
+ 7) >> 3) + PAGE_SIZE - 1) >> PAGE_SHIFT);
+ ntfs_debug("Free mft records(%lld)", nr_records);
+
+ init_waitqueue_head(&vol->free_waitq);
+ INIT_WORK(&vol->precalc_work, precalc_free_clusters);
+ queue_work(ntfs_wq, &vol->precalc_work);
+ return 0;
+ }
+ ntfs_error(sb, "Failed to allocate root directory.");
+ /* Clean up after the successful load_system_files() call from above. */
+ iput(vol->vol_ino);
+ vol->vol_ino = NULL;
+ /* NTFS 3.0+ specific clean up. */
+ if (vol->major_ver >= 3) {
+ if (vol->quota_q_ino) {
+ iput(vol->quota_q_ino);
+ vol->quota_q_ino = NULL;
+ }
+ if (vol->quota_ino) {
+ iput(vol->quota_ino);
+ vol->quota_ino = NULL;
+ }
+ if (vol->extend_ino) {
+ iput(vol->extend_ino);
+ vol->extend_ino = NULL;
+ }
+ if (vol->secure_ino) {
+ iput(vol->secure_ino);
+ vol->secure_ino = NULL;
+ }
+ }
+ iput(vol->root_ino);
+ vol->root_ino = NULL;
+ iput(vol->lcnbmp_ino);
+ vol->lcnbmp_ino = NULL;
+ iput(vol->mftbmp_ino);
+ vol->mftbmp_ino = NULL;
+ if (vol->logfile_ino) {
+ iput(vol->logfile_ino);
+ vol->logfile_ino = NULL;
+ }
+ if (vol->mftmirr_ino) {
+ iput(vol->mftmirr_ino);
+ vol->mftmirr_ino = NULL;
+ }
+ /* Throw away the table of attribute definitions. */
+ vol->attrdef_size = 0;
+ if (vol->attrdef) {
+ ntfs_free(vol->attrdef);
+ vol->attrdef = NULL;
+ }
+ vol->upcase_len = 0;
+ mutex_lock(&ntfs_lock);
+ if (vol->upcase == default_upcase) {
+ ntfs_nr_upcase_users--;
+ vol->upcase = NULL;
+ }
+ mutex_unlock(&ntfs_lock);
+ if (vol->upcase) {
+ ntfs_free(vol->upcase);
+ vol->upcase = NULL;
+ }
+ if (vol->nls_map) {
+ unload_nls(vol->nls_map);
+ vol->nls_map = NULL;
+ }
+ /* Error exit code path. */
+unl_upcase_iput_tmp_ino_err_out_now:
+ if (vol->lcn_empty_bits_per_page)
+ kvfree(vol->lcn_empty_bits_per_page);
+ /*
+ * Decrease the number of upcase users and destroy the global default
+ * upcase table if necessary.
+ */
+ mutex_lock(&ntfs_lock);
+ if (!--ntfs_nr_upcase_users && default_upcase) {
+ ntfs_free(default_upcase);
+ default_upcase = NULL;
+ }
+
+ mutex_unlock(&ntfs_lock);
+iput_tmp_ino_err_out_now:
+ iput(tmp_ino);
+ if (vol->mft_ino && vol->mft_ino != tmp_ino)
+ iput(vol->mft_ino);
+ vol->mft_ino = NULL;
+ /* Errors at this stage are irrelevant. */
+err_out_now:
+ sb->s_fs_info = NULL;
+ kfree(vol);
+ ntfs_debug("Failed, returning -EINVAL.");
+ lockdep_on();
+ return -EINVAL;
+}
+
+/*
+ * This is a slab cache to optimize allocations and deallocations of Unicode
+ * strings of the maximum length allowed by NTFS, which is NTFS_MAX_NAME_LEN
+ * (255) Unicode characters + a terminating NULL Unicode character.
+ */
+struct kmem_cache *ntfs_name_cache;
+
+/* Slab caches for efficient allocation/deallocation of inodes. */
+struct kmem_cache *ntfs_inode_cache;
+struct kmem_cache *ntfs_big_inode_cache;
+
+/* Init once constructor for the inode slab cache. */
+static void ntfs_big_inode_init_once(void *foo)
+{
+ struct ntfs_inode *ni = (struct ntfs_inode *)foo;
+
+ inode_init_once(VFS_I(ni));
+}
+
+/*
+ * Slab caches to optimize allocations and deallocations of attribute search
+ * contexts and index contexts, respectively.
+ */
+struct kmem_cache *ntfs_attr_ctx_cache;
+struct kmem_cache *ntfs_index_ctx_cache;
+
+/* Driver wide mutex. */
+DEFINE_MUTEX(ntfs_lock);
+
+static int ntfs_get_tree(struct fs_context *fc)
+{
+ return get_tree_bdev(fc, ntfs_fill_super);
+}
+
+static void ntfs_free_fs_context(struct fs_context *fc)
+{
+ struct ntfs_volume *vol = fc->s_fs_info;
+
+ if (vol)
+ ntfs_volume_free(vol);
+}
+
+static const struct fs_context_operations ntfs_context_ops = {
+ .parse_param = ntfs_parse_param,
+ .get_tree = ntfs_get_tree,
+ .free = ntfs_free_fs_context,
+ .reconfigure = ntfs_reconfigure,
+};
+
+static int ntfs_init_fs_context(struct fs_context *fc)
+{
+ struct ntfs_volume *vol;
+
+ /* Allocate a new struct ntfs_volume and place it in sb->s_fs_info. */
+ vol = kmalloc(sizeof(struct ntfs_volume), GFP_NOFS);
+ if (!vol)
+ return -ENOMEM;
+
+ /* Initialize struct ntfs_volume structure. */
+ *vol = (struct ntfs_volume) {
+ .uid = INVALID_UID,
+ .gid = INVALID_GID,
+ .fmask = 0,
+ .dmask = 0,
+ .mft_zone_multiplier = 1,
+ .on_errors = ON_ERRORS_CONTINUE,
+ .nls_map = load_nls_default(),
+ .preallocated_size = NTFS_DEF_PREALLOC_SIZE,
+ };
+ init_rwsem(&vol->mftbmp_lock);
+ init_rwsem(&vol->lcnbmp_lock);
+
+ fc->s_fs_info = vol;
+ fc->ops = &ntfs_context_ops;
+ return 0;
+}
+
+static struct file_system_type ntfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "ntfsplus",
+ .init_fs_context = ntfs_init_fs_context,
+ .parameters = ntfs_parameters,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
+};
+MODULE_ALIAS_FS("ntfsplus");
+
+static int ntfs_workqueue_init(void)
+{
+ ntfs_wq = alloc_workqueue("ntfsplus-bg-io", 0, 0);
+ if (!ntfs_wq)
+ return -ENOMEM;
+ return 0;
+}
+
+static void ntfs_workqueue_destroy(void)
+{
+ destroy_workqueue(ntfs_wq);
+ ntfs_wq = NULL;
+}
+
+/* Stable names for the slab caches. */
+static const char ntfs_index_ctx_cache_name[] = "ntfs_index_ctx_cache";
+static const char ntfs_attr_ctx_cache_name[] = "ntfs_attr_ctx_cache";
+static const char ntfs_name_cache_name[] = "ntfs_name_cache";
+static const char ntfs_inode_cache_name[] = "ntfs_inode_cache";
+static const char ntfs_big_inode_cache_name[] = "ntfs_big_inode_cache";
+
+static int __init init_ntfs_fs(void)
+{
+ int err = 0;
+
+ err = ntfs_workqueue_init();
+ if (err) {
+ pr_crit("Failed to register workqueue!\n");
+ return err;
+ }
+
+ ntfs_index_ctx_cache = kmem_cache_create(ntfs_index_ctx_cache_name,
+ sizeof(struct ntfs_index_context), 0 /* offset */,
+ SLAB_HWCACHE_ALIGN, NULL /* ctor */);
+ if (!ntfs_index_ctx_cache) {
+ pr_crit("Failed to create %s!\n", ntfs_index_ctx_cache_name);
+ goto ictx_err_out;
+ }
+ ntfs_attr_ctx_cache = kmem_cache_create(ntfs_attr_ctx_cache_name,
+ sizeof(struct ntfs_attr_search_ctx), 0 /* offset */,
+ SLAB_HWCACHE_ALIGN, NULL /* ctor */);
+ if (!ntfs_attr_ctx_cache) {
+ pr_crit("ntfs+: Failed to create %s!\n",
+ ntfs_attr_ctx_cache_name);
+ goto actx_err_out;
+ }
+
+ ntfs_name_cache = kmem_cache_create(ntfs_name_cache_name,
+ (NTFS_MAX_NAME_LEN+2) * sizeof(__le16), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!ntfs_name_cache) {
+ pr_crit("Failed to create %s!\n", ntfs_name_cache_name);
+ goto name_err_out;
+ }
+
+ ntfs_inode_cache = kmem_cache_create(ntfs_inode_cache_name,
+ sizeof(struct ntfs_inode), 0, SLAB_RECLAIM_ACCOUNT, NULL);
+ if (!ntfs_inode_cache) {
+ pr_crit("Failed to create %s!\n", ntfs_inode_cache_name);
+ goto inode_err_out;
+ }
+
+ ntfs_big_inode_cache = kmem_cache_create(ntfs_big_inode_cache_name,
+ sizeof(struct big_ntfs_inode), 0, SLAB_HWCACHE_ALIGN |
+ SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
+ ntfs_big_inode_init_once);
+ if (!ntfs_big_inode_cache) {
+ pr_crit("Failed to create %s!\n", ntfs_big_inode_cache_name);
+ goto big_inode_err_out;
+ }
+
+ /* Register the ntfs sysctls. */
+ err = ntfs_sysctl(1);
+ if (err) {
+ pr_crit("Failed to register NTFS sysctls!\n");
+ goto sysctl_err_out;
+ }
+
+ err = register_filesystem(&ntfs_fs_type);
+ if (!err) {
+ ntfs_debug("ntfs+ driver registered successfully.");
+ return 0; /* Success! */
+ }
+ pr_crit("Failed to register ntfs+ filesystem driver!\n");
+
+ /* Unregister the ntfs sysctls. */
+ ntfs_sysctl(0);
+sysctl_err_out:
+ kmem_cache_destroy(ntfs_big_inode_cache);
+big_inode_err_out:
+ kmem_cache_destroy(ntfs_inode_cache);
+inode_err_out:
+ kmem_cache_destroy(ntfs_name_cache);
+name_err_out:
+ kmem_cache_destroy(ntfs_attr_ctx_cache);
+actx_err_out:
+ kmem_cache_destroy(ntfs_index_ctx_cache);
+ictx_err_out:
+ if (!err) {
+ pr_crit("Aborting ntfs+ filesystem driver registration...\n");
+ err = -ENOMEM;
+ }
+ return err;
+}
+
+static void __exit exit_ntfs_fs(void)
+{
+ ntfs_debug("Unregistering ntfs+ driver.");
+
+ unregister_filesystem(&ntfs_fs_type);
+
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(ntfs_big_inode_cache);
+ kmem_cache_destroy(ntfs_inode_cache);
+ kmem_cache_destroy(ntfs_name_cache);
+ kmem_cache_destroy(ntfs_attr_ctx_cache);
+ kmem_cache_destroy(ntfs_index_ctx_cache);
+ ntfs_workqueue_destroy();
+ /* Unregister the ntfs sysctls. */
+ ntfs_sysctl(0);
+}
+
+module_init(init_ntfs_fs);
+module_exit(exit_ntfs_fs);
+
+MODULE_AUTHOR("Anton Altaparmakov <anton@...era.com>"); /* Original read-only NTFS driver */
+MODULE_AUTHOR("Namjae Jeon <linkinjeon@...nel.org>"); /* Add write, iomap and various features */
+MODULE_DESCRIPTION("NTFS+ read-write filesystem driver");
+MODULE_LICENSE("GPL");
+#ifdef DEBUG
+module_param(debug_msgs, bint, 0);
+MODULE_PARM_DESC(debug_msgs, "Enable debug messages.");
+#endif
--
2.34.1
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