Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-22 12:11:40 +00:00
Code Issues Packages Projects Releases Wiki Activity

erofs: unify anonymous inodes for blob

Browse Source 
Currently there're two anonymous inodes (inode and anon_inode in struct
erofs_fscache) for each blob.  The former was introduced as the
address_space of page cache for bootstrap.

The latter was initially introduced as both the address_space of page
cache and also a sentinel in the shared domain.  Since now the management
of cookies in share domain has been decoupled with the anonymous inode,
there's no need to maintain an extra anonymous inode.  Let's unify these
two anonymous inodes.

Besides, in non-share-domain mode only bootstrap will allocate anonymous
inode.  To simplify the implementation, always allocate anonymous inode
for both bootstrap and data blobs.  Similarly release anonymous inodes
for data blobs when .put_super() is called, or we'll get "VFS: Busy
inodes after unmount." warning.

Also remove the redundant set_nlink() when initializing the anonymous
inode, since i_nlink has already been initialized to 1 when the inode
gets allocated.

Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Jia Zhu <zhujia.zj@bytedance.com>
Link: https://lore.kernel.org/r/20230209063913.46341-5-jefflexu@linux.alibaba.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Jingbo Xu 2023-02-09 14:39:13 +08:00 committed by Gao Xiang
parent 7032809a44
commit 61fef98945
3 changed files with 39 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

87
fs/erofs/fscache.c
View File

@ -420,14 +420,14 @@ 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);
@ -443,33 +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);
inode->i_private = ctx;
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);
@ -480,18 +479,13 @@ static void erofs_fscache_relinquish_cookie(struct erofs_fscache *ctx)
fscache_unuse_cookie(ctx->cookie, NULL, NULL);
fscache_relinquish_cookie(ctx->cookie, false);
iput(ctx->inode);
iput(ctx->anon_inode);
kfree(ctx->name);
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;
@ -501,35 +495,23 @@ 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;
erofs_fscache_relinquish_cookie(ctx);
return ERR_PTR(-ENOMEM);
}
inode = new_inode(erofs_pseudo_mnt->mnt_sb);
if (!inode) {
err = -ENOMEM;
goto out;
}
ctx->domain = domain;
ctx->anon_inode = inode;
list_add(&ctx->node, &erofs_domain_cookies_list);
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 erofs_fscache *ctx;
struct erofs_domain *domain = EROFS_SB(sb)->domain;
flags |= EROFS_REG_COOKIE_SHARE;
mutex_lock(&erofs_domain_cookies_lock);
list_for_each_entry(ctx, &erofs_domain_cookies_list, node) {
if (ctx->domain != domain || strcmp(ctx->name, name))
@ -544,7 +526,7 @@ struct erofs_fscache *erofs_domain_register_cookie(struct super_block *sb,
mutex_unlock(&erofs_domain_cookies_lock);
return ctx;
}
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;
}
@ -583,7 +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);
@ -602,7 +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);

7
fs/erofs/internal.h
View File

@ -107,8 +107,7 @@ struct erofs_domain {
struct erofs_fscache {
struct fscache_cookie *cookie;
struct inode *inode;
struct inode *anon_inode;
struct inode *inode; /* anonymous inode for the blob */
/* used for share domain mode */
struct erofs_domain *domain;
@ -449,8 +448,8 @@ extern const struct file_operations erofs_dir_fops;
extern const struct iomap_ops z_erofs_iomap_report_ops;
/* flags for erofs_fscache_register_cookie() */
#define EROFS_REG_COOKIE_NEED_INODE 1
#define EROFS_REG_COOKIE_NEED_NOEXIST 2
#define EROFS_REG_COOKIE_SHARE 0x0001
#define EROFS_REG_COOKIE_NEED_NOEXIST 0x0002
void erofs_unmap_metabuf(struct erofs_buf *buf);
void erofs_put_metabuf(struct erofs_buf *buf);

2
fs/erofs/super.c
View File

@ -968,6 +968,8 @@ static void erofs_put_super(struct super_block *sb)
iput(sbi->packed_inode);
sbi->packed_inode = NULL;
#endif
erofs_free_dev_context(sbi->devs);
sbi->devs = NULL;
erofs_fscache_unregister_fs(sb);
}