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-rw-r--r--fs/erofs/super.c96
1 files changed, 77 insertions, 19 deletions
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 3173debeaa5a..2cf96ce1c32e 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -224,10 +224,10 @@ static int erofs_init_device(struct erofs_buf *buf, struct super_block *sb,
struct erofs_device_info *dif, erofs_off_t *pos)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
+ struct erofs_fscache *fscache;
struct erofs_deviceslot *dis;
struct block_device *bdev;
void *ptr;
- int ret;
ptr = erofs_read_metabuf(buf, sb, erofs_blknr(*pos), EROFS_KMAP);
if (IS_ERR(ptr))
@@ -245,10 +245,10 @@ static int erofs_init_device(struct erofs_buf *buf, struct super_block *sb,
}
if (erofs_is_fscache_mode(sb)) {
- ret = erofs_fscache_register_cookie(sb, &dif->fscache,
- dif->path, false);
- if (ret)
- return ret;
+ fscache = erofs_fscache_register_cookie(sb, dif->path, false);
+ if (IS_ERR(fscache))
+ return PTR_ERR(fscache);
+ dif->fscache = fscache;
} else {
bdev = blkdev_get_by_path(dif->path, FMODE_READ | FMODE_EXCL,
sb->s_type);
@@ -381,6 +381,17 @@ static int erofs_read_superblock(struct super_block *sb)
#endif
sbi->islotbits = ilog2(sizeof(struct erofs_inode_compact));
sbi->root_nid = le16_to_cpu(dsb->root_nid);
+#ifdef CONFIG_EROFS_FS_ZIP
+ sbi->packed_inode = NULL;
+ if (erofs_sb_has_fragments(sbi) && dsb->packed_nid) {
+ sbi->packed_inode =
+ erofs_iget(sb, le64_to_cpu(dsb->packed_nid));
+ if (IS_ERR(sbi->packed_inode)) {
+ ret = PTR_ERR(sbi->packed_inode);
+ goto out;
+ }
+ }
+#endif
sbi->inos = le64_to_cpu(dsb->inos);
sbi->build_time = le64_to_cpu(dsb->build_time);
@@ -411,6 +422,10 @@ static int erofs_read_superblock(struct super_block *sb)
erofs_info(sb, "EXPERIMENTAL compressed inline data feature in use. Use at your own risk!");
if (erofs_is_fscache_mode(sb))
erofs_info(sb, "EXPERIMENTAL fscache-based on-demand read feature in use. Use at your own risk!");
+ if (erofs_sb_has_fragments(sbi))
+ erofs_info(sb, "EXPERIMENTAL compressed fragments feature in use. Use at your own risk!");
+ if (erofs_sb_has_dedupe(sbi))
+ erofs_info(sb, "EXPERIMENTAL global deduplication feature in use. Use at your own risk!");
out:
erofs_put_metabuf(&buf);
return ret;
@@ -440,6 +455,7 @@ enum {
Opt_dax_enum,
Opt_device,
Opt_fsid,
+ Opt_domain_id,
Opt_err
};
@@ -465,6 +481,7 @@ static const struct fs_parameter_spec erofs_fs_parameters[] = {
fsparam_enum("dax", Opt_dax_enum, erofs_dax_param_enums),
fsparam_string("device", Opt_device),
fsparam_string("fsid", Opt_fsid),
+ fsparam_string("domain_id", Opt_domain_id),
{}
};
@@ -570,6 +587,16 @@ static int erofs_fc_parse_param(struct fs_context *fc,
errorfc(fc, "fsid option not supported");
#endif
break;
+ case Opt_domain_id:
+#ifdef CONFIG_EROFS_FS_ONDEMAND
+ kfree(ctx->opt.domain_id);
+ ctx->opt.domain_id = kstrdup(param->string, GFP_KERNEL);
+ if (!ctx->opt.domain_id)
+ return -ENOMEM;
+#else
+ errorfc(fc, "domain_id option not supported");
+#endif
+ break;
default:
return -ENOPARAM;
}
@@ -641,7 +668,7 @@ static int erofs_init_managed_cache(struct super_block *sb) { return 0; }
static struct inode *erofs_nfs_get_inode(struct super_block *sb,
u64 ino, u32 generation)
{
- return erofs_iget(sb, ino, false);
+ return erofs_iget(sb, ino);
}
static struct dentry *erofs_fh_to_dentry(struct super_block *sb,
@@ -667,7 +694,7 @@ static struct dentry *erofs_get_parent(struct dentry *child)
err = erofs_namei(d_inode(child), &dotdot_name, &nid, &d_type);
if (err)
return ERR_PTR(err);
- return d_obtain_alias(erofs_iget(child->d_sb, nid, d_type == FT_DIR));
+ return d_obtain_alias(erofs_iget(child->d_sb, nid));
}
static const struct export_operations erofs_export_ops = {
@@ -676,6 +703,13 @@ static const struct export_operations erofs_export_ops = {
.get_parent = erofs_get_parent,
};
+static int erofs_fc_fill_pseudo_super(struct super_block *sb, struct fs_context *fc)
+{
+ static const struct tree_descr empty_descr = {""};
+
+ return simple_fill_super(sb, EROFS_SUPER_MAGIC, &empty_descr);
+}
+
static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct inode *inode;
@@ -695,6 +729,7 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
sb->s_fs_info = sbi;
sbi->opt = ctx->opt;
ctx->opt.fsid = NULL;
+ ctx->opt.domain_id = NULL;
sbi->devs = ctx->devs;
ctx->devs = NULL;
@@ -706,11 +741,6 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
if (err)
return err;
- err = erofs_fscache_register_cookie(sb, &sbi->s_fscache,
- sbi->opt.fsid, true);
- if (err)
- return err;
-
err = super_setup_bdi(sb);
if (err)
return err;
@@ -752,7 +782,7 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
#endif
/* get the root inode */
- inode = erofs_iget(sb, ROOT_NID(sbi), true);
+ inode = erofs_iget(sb, ROOT_NID(sbi));
if (IS_ERR(inode))
return PTR_ERR(inode);
@@ -781,6 +811,11 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
return 0;
}
+static int erofs_fc_anon_get_tree(struct fs_context *fc)
+{
+ return get_tree_nodev(fc, erofs_fc_fill_pseudo_super);
+}
+
static int erofs_fc_get_tree(struct fs_context *fc)
{
struct erofs_fs_context *ctx = fc->fs_private;
@@ -817,7 +852,8 @@ static int erofs_release_device_info(int id, void *ptr, void *data)
fs_put_dax(dif->dax_dev, NULL);
if (dif->bdev)
blkdev_put(dif->bdev, FMODE_READ | FMODE_EXCL);
- erofs_fscache_unregister_cookie(&dif->fscache);
+ erofs_fscache_unregister_cookie(dif->fscache);
+ dif->fscache = NULL;
kfree(dif->path);
kfree(dif);
return 0;
@@ -838,6 +874,7 @@ static void erofs_fc_free(struct fs_context *fc)
erofs_free_dev_context(ctx->devs);
kfree(ctx->opt.fsid);
+ kfree(ctx->opt.domain_id);
kfree(ctx);
}
@@ -848,10 +885,21 @@ static const struct fs_context_operations erofs_context_ops = {
.free = erofs_fc_free,
};
+static const struct fs_context_operations erofs_anon_context_ops = {
+ .get_tree = erofs_fc_anon_get_tree,
+};
+
static int erofs_init_fs_context(struct fs_context *fc)
{
- struct erofs_fs_context *ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ struct erofs_fs_context *ctx;
+
+ /* pseudo mount for anon inodes */
+ if (fc->sb_flags & SB_KERNMOUNT) {
+ fc->ops = &erofs_anon_context_ops;
+ return 0;
+ }
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->devs = kzalloc(sizeof(struct erofs_dev_context), GFP_KERNEL);
@@ -878,8 +926,14 @@ static void erofs_kill_sb(struct super_block *sb)
WARN_ON(sb->s_magic != EROFS_SUPER_MAGIC);
+ /* pseudo mount for anon inodes */
+ if (sb->s_flags & SB_KERNMOUNT) {
+ kill_anon_super(sb);
+ return;
+ }
+
if (erofs_is_fscache_mode(sb))
- generic_shutdown_super(sb);
+ kill_anon_super(sb);
else
kill_block_super(sb);
@@ -889,9 +943,9 @@ static void erofs_kill_sb(struct super_block *sb)
erofs_free_dev_context(sbi->devs);
fs_put_dax(sbi->dax_dev, NULL);
- erofs_fscache_unregister_cookie(&sbi->s_fscache);
erofs_fscache_unregister_fs(sb);
kfree(sbi->opt.fsid);
+ kfree(sbi->opt.domain_id);
kfree(sbi);
sb->s_fs_info = NULL;
}
@@ -908,11 +962,13 @@ static void erofs_put_super(struct super_block *sb)
#ifdef CONFIG_EROFS_FS_ZIP
iput(sbi->managed_cache);
sbi->managed_cache = NULL;
+ iput(sbi->packed_inode);
+ sbi->packed_inode = NULL;
#endif
- erofs_fscache_unregister_cookie(&sbi->s_fscache);
+ erofs_fscache_unregister_fs(sb);
}
-static struct file_system_type erofs_fs_type = {
+struct file_system_type erofs_fs_type = {
.owner = THIS_MODULE,
.name = "erofs",
.init_fs_context = erofs_init_fs_context,
@@ -1044,6 +1100,8 @@ static int erofs_show_options(struct seq_file *seq, struct dentry *root)
#ifdef CONFIG_EROFS_FS_ONDEMAND
if (opt->fsid)
seq_printf(seq, ",fsid=%s", opt->fsid);
+ if (opt->domain_id)
+ seq_printf(seq, ",domain_id=%s", opt->domain_id);
#endif
return 0;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.