From: Jeffle Xu <jefflexu@linux.alibaba.com>
To: dhowells@redhat.com, linux-cachefs@redhat.com, xiang@kernel.org,
chao@kernel.org, linux-erofs@lists.ozlabs.org
Cc: linux-fsdevel@vger.kernel.org, joseph.qi@linux.alibaba.com,
bo.liu@linux.alibaba.com, tao.peng@linux.alibaba.com,
gerry@linux.alibaba.com, eguan@linux.alibaba.com,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 12/20] erofs: add anonymous inode managing page cache of blob file
Date: Tue, 18 Jan 2022 21:12:08 +0800 [thread overview]
Message-ID: <20220118131216.85338-13-jefflexu@linux.alibaba.com> (raw)
In-Reply-To: <20220118131216.85338-1-jefflexu@linux.alibaba.com>
Introduce one anonymous inode for managing page cache of corresponding
blob file. Then erofs could read directly from the address space of the
anonymous inode when cache hit.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
---
fs/erofs/fscache.c | 45 ++++++++++++++++++++++++++++++++++++++++++---
fs/erofs/internal.h | 3 ++-
2 files changed, 44 insertions(+), 4 deletions(-)
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index 10c3f5ea9e24..74683df6144d 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -6,6 +6,9 @@
static struct fscache_volume *volume;
+static const struct address_space_operations erofs_fscache_blob_aops = {
+};
+
static int erofs_fscache_init_cookie(struct erofs_fscache_context *ctx,
char *path)
{
@@ -36,8 +39,34 @@ void erofs_fscache_cleanup_cookie(struct erofs_fscache_context *ctx)
ctx->cookie = NULL;
}
+static int erofs_fscache_get_inode(struct erofs_fscache_context *ctx,
+ struct super_block *sb)
+{
+ struct inode *const inode = new_inode(sb);
+
+ if (!inode)
+ return -ENOMEM;
+
+ set_nlink(inode, 1);
+ inode->i_size = OFFSET_MAX;
+
+ inode->i_mapping->a_ops = &erofs_fscache_blob_aops;
+ mapping_set_gfp_mask(inode->i_mapping,
+ GFP_NOFS | __GFP_HIGHMEM | __GFP_MOVABLE);
+ ctx->inode = inode;
+ return 0;
+}
+
+static inline
+void erofs_fscache_put_inode(struct erofs_fscache_context *ctx)
+{
+ iput(ctx->inode);
+ ctx->inode = NULL;
+}
+
static int erofs_fscahce_init_ctx(struct erofs_fscache_context *ctx,
- struct super_block *sb, char *path)
+ struct super_block *sb, char *path,
+ bool need_inode)
{
int ret;
@@ -47,6 +76,15 @@ static int erofs_fscahce_init_ctx(struct erofs_fscache_context *ctx,
return ret;
}
+ if (need_inode) {
+ ret = erofs_fscache_get_inode(ctx, sb);
+ if (ret) {
+ erofs_err(sb, "failed to get anonymous inode");
+ erofs_fscache_cleanup_cookie(ctx);
+ return ret;
+ }
+ }
+
return 0;
}
@@ -54,10 +92,11 @@ static inline
void erofs_fscache_cleanup_ctx(struct erofs_fscache_context *ctx)
{
erofs_fscache_cleanup_cookie(ctx);
+ erofs_fscache_put_inode(ctx);
}
struct erofs_fscache_context *erofs_fscache_get_ctx(struct super_block *sb,
- char *path)
+ char *path, bool need_inode)
{
struct erofs_fscache_context *ctx;
int ret;
@@ -66,7 +105,7 @@ struct erofs_fscache_context *erofs_fscache_get_ctx(struct super_block *sb,
if (!ctx)
return ERR_PTR(-ENOMEM);
- ret = erofs_fscahce_init_ctx(ctx, sb, path);
+ ret = erofs_fscahce_init_ctx(ctx, sb, path, need_inode);
if (ret) {
kfree(ctx);
return ERR_PTR(ret);
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 1f5bc69e8e9f..bb5e992fe0df 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -99,6 +99,7 @@ struct erofs_sb_lz4_info {
struct erofs_fscache_context {
struct fscache_cookie *cookie;
+ struct inode *inode;
};
struct erofs_sb_info {
@@ -626,7 +627,7 @@ int erofs_init_fscache(void);
void erofs_exit_fscache(void);
struct erofs_fscache_context *erofs_fscache_get_ctx(struct super_block *sb,
- char *path);
+ char *path, bool need_inode);
void erofs_fscache_put_ctx(struct erofs_fscache_context *ctx);
#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
--
2.27.0
next prev parent reply other threads:[~2022-01-18 13:13 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-18 13:11 [PATCH v2 00/20] fscache,erofs: fscache-based demand-read semantics Jeffle Xu
2022-01-18 13:11 ` [PATCH v2 01/20] netfs: make @file optional in netfs_alloc_read_request() Jeffle Xu
2022-01-18 13:11 ` [PATCH v2 02/20] netfs,cachefiles: manage logical/physical offset separately Jeffle Xu
2022-01-18 13:11 ` [PATCH v2 03/20] netfs,fscache: support on-demand reading Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 04/20] cachefiles: extract generic daemon write function Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 05/20] cachefiles: detect backing file size in on-demand read mode Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 06/20] cachefiles: introduce new devnode for " Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 07/20] erofs: use meta buffers for erofs_read_superblock() Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 08/20] erofs: export erofs_map_blocks() Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 09/20] erofs: add mode checking helper Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 10/20] erofs: register global fscache volume Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 11/20] erofs: add cookie context helper functions Jeffle Xu
2022-01-18 13:12 ` Jeffle Xu [this message]
2022-01-18 13:12 ` [PATCH v2 13/20] erofs: register cookie context for bootstrap blob Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 14/20] erofs: implement fscache-based metadata read Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 15/20] erofs: implement fscache-based data read for non-inline layout Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 16/20] erofs: implement fscache-based data read for inline layout Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 17/20] erofs: register cookie context for data blobs Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 18/20] erofs: implement fscache-based data read " Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 19/20] erofs: add 'uuid' mount option Jeffle Xu
2022-01-18 13:12 ` [PATCH v2 20/20] erofs: support on-demand reading Jeffle Xu
2022-01-19 6:40 ` [Linux-cachefs] [PATCH v2 00/20] fscache, erofs: fscache-based demand-read semantics Gao Xiang
2022-01-21 10:57 ` JeffleXu
2022-01-24 17:23 ` [PATCH v2 00/20] fscache,erofs: " David Howells
2022-01-25 1:53 ` JeffleXu
2022-01-25 2:55 ` JeffleXu
2022-01-25 15:34 ` [PATCH v2 11/20] erofs: add cookie context helper functions David Howells
2022-01-26 6:45 ` JeffleXu
2022-01-25 16:15 ` [PATCH v2 00/20] fscache,erofs: fscache-based demand-read semantics David Howells
2022-01-26 6:10 ` JeffleXu
2022-01-26 8:51 ` David Howells
2022-01-27 7:07 ` JeffleXu
2022-01-25 20:27 ` David Howells
2022-01-26 5:26 ` JeffleXu
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