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Message-ID: <163456901488.2614702.3877237088238450861.stgit@warthog.procyon.org.uk>
Date: Mon, 18 Oct 2021 15:56:54 +0100
From: David Howells <dhowells@...hat.com>
To: linux-cachefs@...hat.com
Cc: dhowells@...hat.com, Trond Myklebust <trondmy@...merspace.com>,
Anna Schumaker <anna.schumaker@...app.com>,
Steve French <sfrench@...ba.org>,
Dominique Martinet <asmadeus@...ewreck.org>,
Jeff Layton <jlayton@...hat.com>,
Matthew Wilcox <willy@...radead.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Omar Sandoval <osandov@...ndov.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-afs@...ts.infradead.org, linux-nfs@...r.kernel.org,
linux-cifs@...r.kernel.org, ceph-devel@...r.kernel.org,
v9fs-developer@...ts.sourceforge.net,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 24/67] cachefiles: Remove separate backer dentry from
cachefiles_object
The cachefiles_object struct has two dentry pointers - one for the
file/directory representing the object and a second one in case a data
object is a directory with a file inside of it that contains the data (the
idea being that there might be another file, say, containing a journal of
local changes that need committing or a list of cached xattrs).
At the moment, this isn't implemented, so remove it and always use the main
dentry pointer.
Signed-off-by: David Howells <dhowells@...hat.com>
---
fs/cachefiles/bind.c | 2 --
fs/cachefiles/interface.c | 28 +++++++++-------------------
fs/cachefiles/internal.h | 1 -
fs/cachefiles/io.c | 4 ++--
fs/cachefiles/namei.c | 1 -
5 files changed, 11 insertions(+), 25 deletions(-)
diff --git a/fs/cachefiles/bind.c b/fs/cachefiles/bind.c
index fbc8577477c1..cb3296814056 100644
--- a/fs/cachefiles/bind.c
+++ b/fs/cachefiles/bind.c
@@ -101,8 +101,6 @@ static int cachefiles_daemon_add_cache(struct cachefiles_cache *cache)
if (!fsdef)
goto error_root_object;
- ASSERTCMP(fsdef->backer, ==, NULL);
-
atomic_set(&fsdef->usage, 1);
fsdef->type = FSCACHE_COOKIE_TYPE_INDEX;
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index 2083aca6bd0c..92bb3ba78c41 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -31,8 +31,6 @@ static struct fscache_object *cachefiles_alloc_object(
if (!object)
goto nomem_object;
- ASSERTCMP(object->backer, ==, NULL);
-
atomic_set(&object->usage, 1);
fscache_object_init(&object->fscache, cookie, &cache->cache);
@@ -191,10 +189,6 @@ static void cachefiles_drop_object(struct fscache_object *_object)
}
/* close the filesystem stuff attached to the object */
- if (object->backer != object->dentry)
- dput(object->backer);
- object->backer = NULL;
-
cachefiles_unmark_inode_in_use(object);
dput(object->dentry);
object->dentry = NULL;
@@ -235,7 +229,6 @@ void cachefiles_put_object(struct fscache_object *_object,
_debug("- kill object OBJ%x", object->fscache.debug_id);
ASSERTCMP(object->fscache.parent, ==, NULL);
- ASSERTCMP(object->backer, ==, NULL);
ASSERTCMP(object->dentry, ==, NULL);
ASSERTCMP(object->fscache.n_ops, ==, 0);
ASSERTCMP(object->fscache.n_children, ==, 0);
@@ -303,17 +296,14 @@ static int cachefiles_attr_changed(struct cachefiles_object *object)
if (ni_size == object->i_size)
return 0;
- if (!object->backer)
- return -ENOBUFS;
+ ASSERT(d_is_reg(object->dentry));
- ASSERT(d_is_reg(object->backer));
-
- oi_size = i_size_read(d_backing_inode(object->backer));
+ oi_size = i_size_read(d_backing_inode(object->dentry));
if (oi_size == ni_size)
return 0;
cachefiles_begin_secure(cache, &saved_cred);
- inode_lock(d_inode(object->backer));
+ inode_lock(d_inode(object->dentry));
/* if there's an extension to a partial page at the end of the backing
* file, we need to discard the partial page so that we pick up new
@@ -322,17 +312,17 @@ static int cachefiles_attr_changed(struct cachefiles_object *object)
_debug("discard tail %llx", oi_size);
newattrs.ia_valid = ATTR_SIZE;
newattrs.ia_size = oi_size & PAGE_MASK;
- ret = notify_change(&init_user_ns, object->backer, &newattrs, NULL);
+ ret = notify_change(&init_user_ns, object->dentry, &newattrs, NULL);
if (ret < 0)
goto truncate_failed;
}
newattrs.ia_valid = ATTR_SIZE;
newattrs.ia_size = ni_size;
- ret = notify_change(&init_user_ns, object->backer, &newattrs, NULL);
+ ret = notify_change(&init_user_ns, object->dentry, &newattrs, NULL);
truncate_failed:
- inode_unlock(d_inode(object->backer));
+ inode_unlock(d_inode(object->dentry));
cachefiles_end_secure(cache, saved_cred);
if (ret == -EIO) {
@@ -365,10 +355,10 @@ static void cachefiles_invalidate_object(struct fscache_object *_object)
_enter("{OBJ%x},[%llu]",
object->fscache.debug_id, (unsigned long long)ni_size);
- if (object->backer) {
- ASSERT(d_is_reg(object->backer));
+ if (object->dentry) {
+ ASSERT(d_is_reg(object->dentry));
- path.dentry = object->backer;
+ path.dentry = object->dentry;
path.mnt = cache->mnt;
cachefiles_begin_secure(cache, &saved_cred);
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 83911cf24769..9f2f837027e0 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -36,7 +36,6 @@ struct cachefiles_object {
struct fscache_object fscache; /* fscache handle */
char *d_name; /* Filename */
struct dentry *dentry; /* the file/dir representing this object */
- struct dentry *backer; /* backing file */
loff_t i_size; /* object size */
atomic_t usage; /* object usage count */
uint8_t type; /* object type */
diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index 534c81a05918..920ca48eecfa 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c
@@ -426,9 +426,9 @@ int cachefiles_begin_operation(struct netfs_cache_resources *cres)
struct cachefiles_cache, cache);
path.mnt = cache->mnt;
- path.dentry = object->backer;
+ path.dentry = object->dentry;
file = open_with_fake_path(&path, O_RDWR | O_LARGEFILE | O_DIRECT,
- d_inode(object->backer), cache->cache_cred);
+ d_inode(object->dentry), cache->cache_cred);
if (IS_ERR(file))
return PTR_ERR(file);
if (!S_ISREG(file_inode(file)->i_mode))
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index b5a0aec529af..7f02fcb34b1e 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -459,7 +459,6 @@ int cachefiles_walk_to_object(struct cachefiles_object *parent,
if (ret < 0)
goto check_error;
- object->backer = object->dentry;
object->new = false;
fscache_obtained_object(&object->fscache);
_leave(" = 0 [%lu]", d_backing_inode(object->dentry)->i_ino);
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