summaryrefslogtreecommitdiff
path: root/fs/erofs/fscache.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/erofs/fscache.c')
-rw-r--r--fs/erofs/fscache.c146
1 files changed, 57 insertions, 89 deletions
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index 014e20962376..96a87c023128 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -9,6 +9,7 @@
static DEFINE_MUTEX(erofs_domain_list_lock);
static DEFINE_MUTEX(erofs_domain_cookies_lock);
static LIST_HEAD(erofs_domain_list);
+static LIST_HEAD(erofs_domain_cookies_list);
static struct vfsmount *erofs_pseudo_mnt;
struct erofs_fscache_request {
@@ -164,18 +165,8 @@ static int erofs_fscache_read_folios_async(struct fscache_cookie *cookie,
static int erofs_fscache_meta_read_folio(struct file *data, struct folio *folio)
{
int ret;
- struct super_block *sb = folio_mapping(folio)->host->i_sb;
+ struct erofs_fscache *ctx = folio_mapping(folio)->host->i_private;
struct erofs_fscache_request *req;
- struct erofs_map_dev mdev = {
- .m_deviceid = 0,
- .m_pa = folio_pos(folio),
- };
-
- ret = erofs_map_dev(sb, &mdev);
- if (ret) {
- folio_unlock(folio);
- return ret;
- }
req = erofs_fscache_req_alloc(folio_mapping(folio),
folio_pos(folio), folio_size(folio));
@@ -184,8 +175,8 @@ static int erofs_fscache_meta_read_folio(struct file *data, struct folio *folio)
return PTR_ERR(req);
}
- ret = erofs_fscache_read_folios_async(mdev.m_fscache->cookie,
- req, mdev.m_pa, folio_size(folio));
+ ret = erofs_fscache_read_folios_async(ctx->cookie, req,
+ folio_pos(folio), folio_size(folio));
if (ret)
req->error = ret;
@@ -207,7 +198,7 @@ static int erofs_fscache_data_read_slice(struct erofs_fscache_request *primary)
int ret;
map.m_la = pos;
- ret = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW);
+ ret = erofs_map_blocks(inode, &map);
if (ret)
return ret;
@@ -328,8 +319,6 @@ const struct address_space_operations erofs_fscache_access_aops = {
static void erofs_fscache_domain_put(struct erofs_domain *domain)
{
- if (!domain)
- return;
mutex_lock(&erofs_domain_list_lock);
if (refcount_dec_and_test(&domain->ref)) {
list_del(&domain->list);
@@ -337,8 +326,8 @@ static void erofs_fscache_domain_put(struct erofs_domain *domain)
kern_unmount(erofs_pseudo_mnt);
erofs_pseudo_mnt = NULL;
}
- mutex_unlock(&erofs_domain_list_lock);
fscache_relinquish_volume(domain->volume, NULL, false);
+ mutex_unlock(&erofs_domain_list_lock);
kfree(domain->domain_id);
kfree(domain);
return;
@@ -431,19 +420,21 @@ static int erofs_fscache_register_domain(struct super_block *sb)
return err;
}
-static
-struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb,
- char *name,
- unsigned int flags)
+static struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb,
+ char *name, unsigned int flags)
{
struct fscache_volume *volume = EROFS_SB(sb)->volume;
struct erofs_fscache *ctx;
struct fscache_cookie *cookie;
+ struct super_block *isb;
+ struct inode *inode;
int ret;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return ERR_PTR(-ENOMEM);
+ INIT_LIST_HEAD(&ctx->node);
+ refcount_set(&ctx->ref, 1);
cookie = fscache_acquire_cookie(volume, FSCACHE_ADV_WANT_CACHE_SIZE,
name, strlen(name), NULL, 0, 0);
@@ -452,32 +443,32 @@ struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb,
ret = -EINVAL;
goto err;
}
-
fscache_use_cookie(cookie, false);
- ctx->cookie = cookie;
-
- if (flags & EROFS_REG_COOKIE_NEED_INODE) {
- struct inode *const inode = new_inode(sb);
-
- if (!inode) {
- erofs_err(sb, "failed to get anon inode for %s", name);
- ret = -ENOMEM;
- goto err_cookie;
- }
- set_nlink(inode, 1);
- inode->i_size = OFFSET_MAX;
- inode->i_mapping->a_ops = &erofs_fscache_meta_aops;
- mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
-
- ctx->inode = inode;
+ /*
+ * Allocate anonymous inode in global pseudo mount for shareable blobs,
+ * so that they are accessible among erofs fs instances.
+ */
+ isb = flags & EROFS_REG_COOKIE_SHARE ? erofs_pseudo_mnt->mnt_sb : sb;
+ inode = new_inode(isb);
+ if (!inode) {
+ erofs_err(sb, "failed to get anon inode for %s", name);
+ ret = -ENOMEM;
+ goto err_cookie;
}
+ inode->i_size = OFFSET_MAX;
+ inode->i_mapping->a_ops = &erofs_fscache_meta_aops;
+ mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
+ inode->i_private = ctx;
+
+ ctx->cookie = cookie;
+ ctx->inode = inode;
return ctx;
err_cookie:
- fscache_unuse_cookie(ctx->cookie, NULL, NULL);
- fscache_relinquish_cookie(ctx->cookie, false);
+ fscache_unuse_cookie(cookie, NULL, NULL);
+ fscache_relinquish_cookie(cookie, false);
err:
kfree(ctx);
return ERR_PTR(ret);
@@ -492,13 +483,9 @@ static void erofs_fscache_relinquish_cookie(struct erofs_fscache *ctx)
kfree(ctx);
}
-static
-struct erofs_fscache *erofs_fscache_domain_init_cookie(struct super_block *sb,
- char *name,
- unsigned int flags)
+static struct erofs_fscache *erofs_domain_init_cookie(struct super_block *sb,
+ char *name, unsigned int flags)
{
- int err;
- struct inode *inode;
struct erofs_fscache *ctx;
struct erofs_domain *domain = EROFS_SB(sb)->domain;
@@ -508,55 +495,38 @@ struct erofs_fscache *erofs_fscache_domain_init_cookie(struct super_block *sb,
ctx->name = kstrdup(name, GFP_KERNEL);
if (!ctx->name) {
- err = -ENOMEM;
- goto out;
- }
-
- inode = new_inode(erofs_pseudo_mnt->mnt_sb);
- if (!inode) {
- err = -ENOMEM;
- goto out;
+ erofs_fscache_relinquish_cookie(ctx);
+ return ERR_PTR(-ENOMEM);
}
- ctx->domain = domain;
- ctx->anon_inode = inode;
- inode->i_private = ctx;
refcount_inc(&domain->ref);
+ ctx->domain = domain;
+ list_add(&ctx->node, &erofs_domain_cookies_list);
return ctx;
-out:
- erofs_fscache_relinquish_cookie(ctx);
- return ERR_PTR(err);
}
-static
-struct erofs_fscache *erofs_domain_register_cookie(struct super_block *sb,
- char *name,
- unsigned int flags)
+static struct erofs_fscache *erofs_domain_register_cookie(struct super_block *sb,
+ char *name, unsigned int flags)
{
- struct inode *inode;
struct erofs_fscache *ctx;
struct erofs_domain *domain = EROFS_SB(sb)->domain;
- struct super_block *psb = erofs_pseudo_mnt->mnt_sb;
+ flags |= EROFS_REG_COOKIE_SHARE;
mutex_lock(&erofs_domain_cookies_lock);
- spin_lock(&psb->s_inode_list_lock);
- list_for_each_entry(inode, &psb->s_inodes, i_sb_list) {
- ctx = inode->i_private;
- if (!ctx || ctx->domain != domain || strcmp(ctx->name, name))
+ list_for_each_entry(ctx, &erofs_domain_cookies_list, node) {
+ if (ctx->domain != domain || strcmp(ctx->name, name))
continue;
if (!(flags & EROFS_REG_COOKIE_NEED_NOEXIST)) {
- igrab(inode);
+ refcount_inc(&ctx->ref);
} else {
erofs_err(sb, "%s already exists in domain %s", name,
domain->domain_id);
ctx = ERR_PTR(-EEXIST);
}
- spin_unlock(&psb->s_inode_list_lock);
mutex_unlock(&erofs_domain_cookies_lock);
return ctx;
}
- spin_unlock(&psb->s_inode_list_lock);
- ctx = erofs_fscache_domain_init_cookie(sb, name, flags);
+ ctx = erofs_domain_init_cookie(sb, name, flags);
mutex_unlock(&erofs_domain_cookies_lock);
return ctx;
}
@@ -572,23 +542,22 @@ struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
void erofs_fscache_unregister_cookie(struct erofs_fscache *ctx)
{
- bool drop;
- struct erofs_domain *domain;
+ struct erofs_domain *domain = NULL;
if (!ctx)
return;
- domain = ctx->domain;
- if (domain) {
- mutex_lock(&erofs_domain_cookies_lock);
- drop = atomic_read(&ctx->anon_inode->i_count) == 1;
- iput(ctx->anon_inode);
- mutex_unlock(&erofs_domain_cookies_lock);
- if (!drop)
- return;
- }
+ if (!ctx->domain)
+ return erofs_fscache_relinquish_cookie(ctx);
- erofs_fscache_relinquish_cookie(ctx);
- erofs_fscache_domain_put(domain);
+ mutex_lock(&erofs_domain_cookies_lock);
+ if (refcount_dec_and_test(&ctx->ref)) {
+ domain = ctx->domain;
+ list_del(&ctx->node);
+ erofs_fscache_relinquish_cookie(ctx);
+ }
+ mutex_unlock(&erofs_domain_cookies_lock);
+ if (domain)
+ erofs_fscache_domain_put(domain);
}
int erofs_fscache_register_fs(struct super_block *sb)
@@ -596,7 +565,7 @@ int erofs_fscache_register_fs(struct super_block *sb)
int ret;
struct erofs_sb_info *sbi = EROFS_SB(sb);
struct erofs_fscache *fscache;
- unsigned int flags;
+ unsigned int flags = 0;
if (sbi->domain_id)
ret = erofs_fscache_register_domain(sb);
@@ -615,7 +584,6 @@ int erofs_fscache_register_fs(struct super_block *sb)
*
* Acquired domain/volume will be relinquished in kill_sb() on error.
*/
- flags = EROFS_REG_COOKIE_NEED_INODE;
if (sbi->domain_id)
flags |= EROFS_REG_COOKIE_NEED_NOEXIST;
fscache = erofs_fscache_register_cookie(sb, sbi->fsid, flags);