summaryrefslogtreecommitdiffstats
path: root/fs/hpfs/super.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/hpfs/super.c')
-rw-r--r--fs/hpfs/super.c789
1 files changed, 789 insertions, 0 deletions
diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
new file mode 100644
index 000000000..8fbdbf080
--- /dev/null
+++ b/fs/hpfs/super.c
@@ -0,0 +1,789 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/fs/hpfs/super.c
+ *
+ * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
+ *
+ * mounting, unmounting, error handling
+ */
+
+#include "hpfs_fn.h"
+#include <linux/module.h>
+#include <linux/fs_struct.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
+#include <linux/init.h>
+#include <linux/statfs.h>
+#include <linux/magic.h>
+#include <linux/sched.h>
+#include <linux/bitmap.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+
+/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
+
+static void mark_dirty(struct super_block *s, int remount)
+{
+ if (hpfs_sb(s)->sb_chkdsk && (remount || !sb_rdonly(s))) {
+ struct buffer_head *bh;
+ struct hpfs_spare_block *sb;
+ if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
+ sb->dirty = 1;
+ sb->old_wrote = 0;
+ mark_buffer_dirty(bh);
+ sync_dirty_buffer(bh);
+ brelse(bh);
+ }
+ }
+}
+
+/* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
+ were errors) */
+
+static void unmark_dirty(struct super_block *s)
+{
+ struct buffer_head *bh;
+ struct hpfs_spare_block *sb;
+ if (sb_rdonly(s)) return;
+ sync_blockdev(s->s_bdev);
+ if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
+ sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
+ sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
+ mark_buffer_dirty(bh);
+ sync_dirty_buffer(bh);
+ brelse(bh);
+ }
+}
+
+/* Filesystem error... */
+void hpfs_error(struct super_block *s, const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ pr_err("filesystem error: %pV", &vaf);
+
+ va_end(args);
+
+ if (!hpfs_sb(s)->sb_was_error) {
+ if (hpfs_sb(s)->sb_err == 2) {
+ pr_cont("; crashing the system because you wanted it\n");
+ mark_dirty(s, 0);
+ panic("HPFS panic");
+ } else if (hpfs_sb(s)->sb_err == 1) {
+ if (sb_rdonly(s))
+ pr_cont("; already mounted read-only\n");
+ else {
+ pr_cont("; remounting read-only\n");
+ mark_dirty(s, 0);
+ s->s_flags |= SB_RDONLY;
+ }
+ } else if (sb_rdonly(s))
+ pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
+ else
+ pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
+ } else
+ pr_cont("\n");
+ hpfs_sb(s)->sb_was_error = 1;
+}
+
+/*
+ * A little trick to detect cycles in many hpfs structures and don't let the
+ * kernel crash on corrupted filesystem. When first called, set c2 to 0.
+ *
+ * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
+ * nested each in other, chkdsk locked up happilly.
+ */
+
+int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
+ char *msg)
+{
+ if (*c2 && *c1 == key) {
+ hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
+ return 1;
+ }
+ (*c2)++;
+ if (!((*c2 - 1) & *c2)) *c1 = key;
+ return 0;
+}
+
+static void free_sbi(struct hpfs_sb_info *sbi)
+{
+ kfree(sbi->sb_cp_table);
+ kfree(sbi->sb_bmp_dir);
+ kfree(sbi);
+}
+
+static void lazy_free_sbi(struct rcu_head *rcu)
+{
+ free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
+}
+
+static void hpfs_put_super(struct super_block *s)
+{
+ hpfs_lock(s);
+ unmark_dirty(s);
+ hpfs_unlock(s);
+ call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
+}
+
+static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
+{
+ struct quad_buffer_head qbh;
+ unsigned long *bits;
+ unsigned count;
+
+ bits = hpfs_map_4sectors(s, secno, &qbh, 0);
+ if (!bits)
+ return (unsigned)-1;
+ count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
+ hpfs_brelse4(&qbh);
+ return count;
+}
+
+static unsigned count_bitmaps(struct super_block *s)
+{
+ unsigned n, count, n_bands;
+ n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
+ count = 0;
+ for (n = 0; n < COUNT_RD_AHEAD; n++) {
+ hpfs_prefetch_bitmap(s, n);
+ }
+ for (n = 0; n < n_bands; n++) {
+ unsigned c;
+ hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
+ c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
+ if (c != (unsigned)-1)
+ count += c;
+ }
+ return count;
+}
+
+unsigned hpfs_get_free_dnodes(struct super_block *s)
+{
+ struct hpfs_sb_info *sbi = hpfs_sb(s);
+ if (sbi->sb_n_free_dnodes == (unsigned)-1) {
+ unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
+ if (c == (unsigned)-1)
+ return 0;
+ sbi->sb_n_free_dnodes = c;
+ }
+ return sbi->sb_n_free_dnodes;
+}
+
+static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct super_block *s = dentry->d_sb;
+ struct hpfs_sb_info *sbi = hpfs_sb(s);
+ u64 id = huge_encode_dev(s->s_bdev->bd_dev);
+
+ hpfs_lock(s);
+
+ if (sbi->sb_n_free == (unsigned)-1)
+ sbi->sb_n_free = count_bitmaps(s);
+
+ buf->f_type = s->s_magic;
+ buf->f_bsize = 512;
+ buf->f_blocks = sbi->sb_fs_size;
+ buf->f_bfree = sbi->sb_n_free;
+ buf->f_bavail = sbi->sb_n_free;
+ buf->f_files = sbi->sb_dirband_size / 4;
+ buf->f_ffree = hpfs_get_free_dnodes(s);
+ buf->f_fsid = u64_to_fsid(id);
+ buf->f_namelen = 254;
+
+ hpfs_unlock(s);
+
+ return 0;
+}
+
+
+long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case FITRIM: {
+ struct fstrim_range range;
+ secno n_trimmed;
+ int r;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
+ return -EFAULT;
+ r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed);
+ if (r)
+ return r;
+ range.len = (u64)n_trimmed << 9;
+ if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
+ return -EFAULT;
+ return 0;
+ }
+ default: {
+ return -ENOIOCTLCMD;
+ }
+ }
+}
+
+
+static struct kmem_cache * hpfs_inode_cachep;
+
+static struct inode *hpfs_alloc_inode(struct super_block *sb)
+{
+ struct hpfs_inode_info *ei;
+ ei = alloc_inode_sb(sb, hpfs_inode_cachep, GFP_NOFS);
+ if (!ei)
+ return NULL;
+ return &ei->vfs_inode;
+}
+
+static void hpfs_free_inode(struct inode *inode)
+{
+ kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
+}
+
+static void init_once(void *foo)
+{
+ struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
+
+ inode_init_once(&ei->vfs_inode);
+}
+
+static int init_inodecache(void)
+{
+ hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
+ sizeof(struct hpfs_inode_info),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_ACCOUNT),
+ init_once);
+ if (hpfs_inode_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static void destroy_inodecache(void)
+{
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(hpfs_inode_cachep);
+}
+
+enum {
+ Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case,
+ Opt_check, Opt_err, Opt_eas, Opt_chkdsk, Opt_timeshift,
+};
+
+static const struct constant_table hpfs_param_case[] = {
+ {"asis", 0},
+ {"lower", 1},
+ {}
+};
+
+static const struct constant_table hpfs_param_check[] = {
+ {"none", 0},
+ {"normal", 1},
+ {"strict", 2},
+ {}
+};
+
+static const struct constant_table hpfs_param_err[] = {
+ {"continue", 0},
+ {"remount-ro", 1},
+ {"panic", 2},
+ {}
+};
+
+static const struct constant_table hpfs_param_eas[] = {
+ {"no", 0},
+ {"ro", 1},
+ {"rw", 2},
+ {}
+};
+
+static const struct constant_table hpfs_param_chkdsk[] = {
+ {"no", 0},
+ {"errors", 1},
+ {"always", 2},
+ {}
+};
+
+static const struct fs_parameter_spec hpfs_param_spec[] = {
+ fsparam_flag ("help", Opt_help),
+ fsparam_uid ("uid", Opt_uid),
+ fsparam_gid ("gid", Opt_gid),
+ fsparam_u32oct ("umask", Opt_umask),
+ fsparam_enum ("case", Opt_case, hpfs_param_case),
+ fsparam_enum ("check", Opt_check, hpfs_param_check),
+ fsparam_enum ("errors", Opt_err, hpfs_param_err),
+ fsparam_enum ("eas", Opt_eas, hpfs_param_eas),
+ fsparam_enum ("chkdsk", Opt_chkdsk, hpfs_param_chkdsk),
+ fsparam_s32 ("timeshift", Opt_timeshift),
+ {}
+};
+
+struct hpfs_fc_context {
+ kuid_t uid;
+ kgid_t gid;
+ umode_t umask;
+ int lowercase;
+ int eas;
+ int chk;
+ int errs;
+ int chkdsk;
+ int timeshift;
+};
+
+static inline void hpfs_help(void)
+{
+ pr_info("\n\
+HPFS filesystem options:\n\
+ help do not mount and display this text\n\
+ uid=xxx set uid of files that don't have uid specified in eas\n\
+ gid=xxx set gid of files that don't have gid specified in eas\n\
+ umask=xxx set mode of files that don't have mode specified in eas\n\
+ case=lower lowercase all files\n\
+ case=asis do not lowercase files (default)\n\
+ check=none no fs checks - kernel may crash on corrupted filesystem\n\
+ check=normal do some checks - it should not crash (default)\n\
+ check=strict do extra time-consuming checks, used for debugging\n\
+ errors=continue continue on errors\n\
+ errors=remount-ro remount read-only if errors found (default)\n\
+ errors=panic panic on errors\n\
+ chkdsk=no do not mark fs for chkdsking even if there were errors\n\
+ chkdsk=errors mark fs dirty if errors found (default)\n\
+ chkdsk=always always mark fs dirty - used for debugging\n\
+ eas=no ignore extended attributes\n\
+ eas=ro read but do not write extended attributes\n\
+ eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
+ timeshift=nnn add nnn seconds to file times\n\
+\n");
+}
+
+static int hpfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+ struct hpfs_fc_context *ctx = fc->fs_private;
+ struct fs_parse_result result;
+ int opt;
+
+ opt = fs_parse(fc, hpfs_param_spec, param, &result);
+ if (opt < 0)
+ return opt;
+
+ switch (opt) {
+ case Opt_help:
+ hpfs_help();
+ return -EINVAL;
+ case Opt_uid:
+ ctx->uid = result.uid;
+ break;
+ case Opt_gid:
+ ctx->gid = result.gid;
+ break;
+ case Opt_umask:
+ ctx->umask = result.uint_32;
+ break;
+ case Opt_case:
+ ctx->lowercase = result.uint_32;
+ break;
+ case Opt_check:
+ ctx->chk = result.uint_32;
+ break;
+ case Opt_err:
+ ctx->errs = result.uint_32;
+ break;
+ case Opt_eas:
+ ctx->eas = result.uint_32;
+ break;
+ case Opt_chkdsk:
+ ctx->chkdsk = result.uint_32;
+ break;
+ case Opt_timeshift:
+ {
+ char *rhs = param->string;
+ int timeshift;
+
+ if (kstrtoint(rhs, 0, &timeshift))
+ return -EINVAL;
+ ctx->timeshift = timeshift;
+ break;
+ }
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int hpfs_reconfigure(struct fs_context *fc)
+{
+ struct hpfs_fc_context *ctx = fc->fs_private;
+ struct super_block *s = fc->root->d_sb;
+ struct hpfs_sb_info *sbi = hpfs_sb(s);
+
+ sync_filesystem(s);
+
+ fc->sb_flags |= SB_NOATIME;
+
+ hpfs_lock(s);
+
+ if (ctx->timeshift != sbi->sb_timeshift) {
+ pr_err("timeshift can't be changed using remount.\n");
+ goto out_err;
+ }
+
+ unmark_dirty(s);
+
+ sbi->sb_uid = ctx->uid; sbi->sb_gid = ctx->gid;
+ sbi->sb_mode = 0777 & ~ctx->umask;
+ sbi->sb_lowercase = ctx->lowercase;
+ sbi->sb_eas = ctx->eas; sbi->sb_chk = ctx->chk;
+ sbi->sb_chkdsk = ctx->chkdsk;
+ sbi->sb_err = ctx->errs; sbi->sb_timeshift = ctx->timeshift;
+
+ if (!(fc->sb_flags & SB_RDONLY)) mark_dirty(s, 1);
+
+ hpfs_unlock(s);
+ return 0;
+
+out_err:
+ hpfs_unlock(s);
+ return -EINVAL;
+}
+
+static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
+{
+ struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
+
+ seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
+ seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
+ seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
+ if (sbi->sb_lowercase)
+ seq_printf(seq, ",case=lower");
+ if (!sbi->sb_chk)
+ seq_printf(seq, ",check=none");
+ if (sbi->sb_chk == 2)
+ seq_printf(seq, ",check=strict");
+ if (!sbi->sb_err)
+ seq_printf(seq, ",errors=continue");
+ if (sbi->sb_err == 2)
+ seq_printf(seq, ",errors=panic");
+ if (!sbi->sb_chkdsk)
+ seq_printf(seq, ",chkdsk=no");
+ if (sbi->sb_chkdsk == 2)
+ seq_printf(seq, ",chkdsk=always");
+ if (!sbi->sb_eas)
+ seq_printf(seq, ",eas=no");
+ if (sbi->sb_eas == 1)
+ seq_printf(seq, ",eas=ro");
+ if (sbi->sb_timeshift)
+ seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
+ return 0;
+}
+
+/* Super operations */
+
+static const struct super_operations hpfs_sops =
+{
+ .alloc_inode = hpfs_alloc_inode,
+ .free_inode = hpfs_free_inode,
+ .evict_inode = hpfs_evict_inode,
+ .put_super = hpfs_put_super,
+ .statfs = hpfs_statfs,
+ .show_options = hpfs_show_options,
+};
+
+static int hpfs_fill_super(struct super_block *s, struct fs_context *fc)
+{
+ struct hpfs_fc_context *ctx = fc->fs_private;
+ struct buffer_head *bh0, *bh1, *bh2;
+ struct hpfs_boot_block *bootblock;
+ struct hpfs_super_block *superblock;
+ struct hpfs_spare_block *spareblock;
+ struct hpfs_sb_info *sbi;
+ struct inode *root;
+ int silent = fc->sb_flags & SB_SILENT;
+
+ dnode_secno root_dno;
+ struct hpfs_dirent *de = NULL;
+ struct quad_buffer_head qbh;
+
+ sbi = kzalloc_obj(*sbi);
+ if (!sbi) {
+ return -ENOMEM;
+ }
+ s->s_fs_info = sbi;
+
+ mutex_init(&sbi->hpfs_mutex);
+ hpfs_lock(s);
+
+ /*sbi->sb_mounting = 1;*/
+ if (!sb_set_blocksize(s, 512))
+ goto bail0;
+ sbi->sb_fs_size = -1;
+ if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
+ if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
+ if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
+
+ /* Check magics */
+ if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
+ ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
+ || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
+ if (!silent)
+ pr_err("Bad magic ... probably not HPFS\n");
+ goto bail4;
+ }
+
+ /* Check version */
+ if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) {
+ pr_err("Bad version %d,%d. Mount readonly to go around\n",
+ (int)superblock->version, (int)superblock->funcversion);
+ pr_err("please try recent version of HPFS driver at http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi and if it still can't understand this format, contact author - mikulas@artax.karlin.mff.cuni.cz\n");
+ goto bail4;
+ }
+
+ s->s_flags |= SB_NOATIME;
+
+ /* Fill superblock stuff */
+ s->s_magic = HPFS_SUPER_MAGIC;
+ s->s_op = &hpfs_sops;
+ set_default_d_op(s, &hpfs_dentry_operations);
+ s->s_time_min = local_to_gmt(s, 0);
+ s->s_time_max = local_to_gmt(s, U32_MAX);
+
+ sbi->sb_root = le32_to_cpu(superblock->root);
+ sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
+ sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
+ sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
+ sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
+ sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
+ sbi->sb_uid = ctx->uid;
+ sbi->sb_gid = ctx->gid;
+ sbi->sb_mode = 0777 & ~ctx->umask;
+ sbi->sb_n_free = -1;
+ sbi->sb_n_free_dnodes = -1;
+ sbi->sb_lowercase = ctx->lowercase;
+ sbi->sb_eas = ctx->eas;
+ sbi->sb_chk = ctx->chk;
+ sbi->sb_chkdsk = ctx->chkdsk;
+ sbi->sb_err = ctx->errs;
+ sbi->sb_timeshift = ctx->timeshift;
+ sbi->sb_was_error = 0;
+ sbi->sb_cp_table = NULL;
+ sbi->sb_c_bitmap = -1;
+ sbi->sb_max_fwd_alloc = 0xffffff;
+
+ if (sbi->sb_fs_size >= 0x80000000) {
+ hpfs_error(s, "invalid size in superblock: %08x",
+ (unsigned)sbi->sb_fs_size);
+ goto bail4;
+ }
+
+ if (spareblock->n_spares_used)
+ hpfs_load_hotfix_map(s, spareblock);
+
+ /* Load bitmap directory */
+ if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
+ goto bail4;
+
+ /* Check for general fs errors*/
+ if (spareblock->dirty && !spareblock->old_wrote) {
+ if (sbi->sb_err == 2) {
+ pr_err("Improperly stopped, not mounted\n");
+ goto bail4;
+ }
+ hpfs_error(s, "improperly stopped");
+ }
+
+ if (!sb_rdonly(s)) {
+ spareblock->dirty = 1;
+ spareblock->old_wrote = 0;
+ mark_buffer_dirty(bh2);
+ }
+
+ if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
+ if (sbi->sb_err >= 2) {
+ pr_err("Spare dnodes used, try chkdsk\n");
+ mark_dirty(s, 0);
+ goto bail4;
+ }
+ hpfs_error(s, "warning: spare dnodes used, try chkdsk");
+ if (sbi->sb_err == 0)
+ pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
+ }
+ if (sbi->sb_chk) {
+ unsigned a;
+ if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
+ le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
+ hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
+ le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
+ goto bail4;
+ }
+ a = sbi->sb_dirband_size;
+ sbi->sb_dirband_size = 0;
+ if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
+ hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
+ hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
+ mark_dirty(s, 0);
+ goto bail4;
+ }
+ sbi->sb_dirband_size = a;
+ } else
+ pr_err("You really don't want any checks? You are crazy...\n");
+
+ /* Load code page table */
+ if (le32_to_cpu(spareblock->n_code_pages))
+ if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
+ pr_err("code page support is disabled\n");
+
+ brelse(bh2);
+ brelse(bh1);
+ brelse(bh0);
+
+ root = iget_locked(s, sbi->sb_root);
+ if (!root)
+ goto bail0;
+ hpfs_init_inode(root);
+ hpfs_read_inode(root);
+ unlock_new_inode(root);
+ s->s_root = d_make_root(root);
+ if (!s->s_root)
+ goto bail0;
+
+ /*
+ * find the root directory's . pointer & finish filling in the inode
+ */
+
+ root_dno = hpfs_fnode_dno(s, sbi->sb_root);
+ if (root_dno)
+ de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
+ if (!de)
+ hpfs_error(s, "unable to find root dir");
+ else {
+ inode_set_atime(root,
+ local_to_gmt(s, le32_to_cpu(de->read_date)),
+ 0);
+ inode_set_mtime(root,
+ local_to_gmt(s, le32_to_cpu(de->write_date)),
+ 0);
+ inode_set_ctime(root,
+ local_to_gmt(s, le32_to_cpu(de->creation_date)),
+ 0);
+ hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
+ hpfs_i(root)->i_parent_dir = root->i_ino;
+ if (root->i_size == -1)
+ root->i_size = 2048;
+ if (root->i_blocks == -1)
+ root->i_blocks = 5;
+ hpfs_brelse4(&qbh);
+ }
+ hpfs_unlock(s);
+ return 0;
+
+bail4: brelse(bh2);
+bail3: brelse(bh1);
+bail2: brelse(bh0);
+bail1:
+bail0:
+ hpfs_unlock(s);
+ free_sbi(sbi);
+ return -EINVAL;
+}
+
+static int hpfs_get_tree(struct fs_context *fc)
+{
+ return get_tree_bdev(fc, hpfs_fill_super);
+}
+
+static void hpfs_free_fc(struct fs_context *fc)
+{
+ kfree(fc->fs_private);
+}
+
+static const struct fs_context_operations hpfs_fc_context_ops = {
+ .parse_param = hpfs_parse_param,
+ .get_tree = hpfs_get_tree,
+ .reconfigure = hpfs_reconfigure,
+ .free = hpfs_free_fc,
+};
+
+static int hpfs_init_fs_context(struct fs_context *fc)
+{
+ struct hpfs_fc_context *ctx;
+
+ ctx = kzalloc_obj(struct hpfs_fc_context);
+ if (!ctx)
+ return -ENOMEM;
+
+ if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
+ struct super_block *sb = fc->root->d_sb;
+ struct hpfs_sb_info *sbi = hpfs_sb(sb);
+
+ ctx->uid = sbi->sb_uid;
+ ctx->gid = sbi->sb_gid;
+ ctx->umask = 0777 & ~sbi->sb_mode;
+ ctx->lowercase = sbi->sb_lowercase;
+ ctx->eas = sbi->sb_eas;
+ ctx->chk = sbi->sb_chk;
+ ctx->chkdsk = sbi->sb_chkdsk;
+ ctx->errs = sbi->sb_err;
+ ctx->timeshift = sbi->sb_timeshift;
+
+ } else {
+ ctx->uid = current_uid();
+ ctx->gid = current_gid();
+ ctx->umask = current_umask();
+ ctx->lowercase = 0;
+ ctx->eas = 2;
+ ctx->chk = 1;
+ ctx->errs = 1;
+ ctx->chkdsk = 1;
+ ctx->timeshift = 0;
+ }
+
+ fc->fs_private = ctx;
+ fc->ops = &hpfs_fc_context_ops;
+
+ return 0;
+};
+
+static struct file_system_type hpfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "hpfs",
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+ .init_fs_context = hpfs_init_fs_context,
+ .parameters = hpfs_param_spec,
+};
+MODULE_ALIAS_FS("hpfs");
+
+static int __init init_hpfs_fs(void)
+{
+ int err = init_inodecache();
+ if (err)
+ goto out1;
+ err = register_filesystem(&hpfs_fs_type);
+ if (err)
+ goto out;
+ return 0;
+out:
+ destroy_inodecache();
+out1:
+ return err;
+}
+
+static void __exit exit_hpfs_fs(void)
+{
+ unregister_filesystem(&hpfs_fs_type);
+ destroy_inodecache();
+}
+
+module_init(init_hpfs_fs)
+module_exit(exit_hpfs_fs)
+MODULE_DESCRIPTION("OS/2 HPFS file system support");
+MODULE_LICENSE("GPL");
generated by cgit v1.3.1 (git 2.54.0) at 2026-10-12 09:37:19 +0000