From: Amir Goldstein <amir73il@gmail.com>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: Alexander Larsson <alexl@redhat.com>, linux-unionfs@vger.kernel.org
Subject: [PATCH v2 07/13] ovl: deduplicate lowerdata and lowerstack[]
Date: Thu, 27 Apr 2023 16:05:33 +0300 [thread overview]
Message-ID: <20230427130539.2798797-8-amir73il@gmail.com> (raw)
In-Reply-To: <20230427130539.2798797-1-amir73il@gmail.com>
The ovl_inode contains a copy of lowerdata in lowerstack[], so the
lowerdata inode member can be removed.
Use accessors ovl_lowerdata*() to get the lowerdata whereever the member
was accessed directly.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
fs/overlayfs/inode.c | 2 --
fs/overlayfs/namei.c | 2 --
fs/overlayfs/overlayfs.h | 1 -
fs/overlayfs/ovl_entry.h | 16 +++++++++++++++-
fs/overlayfs/super.c | 3 ---
fs/overlayfs/util.c | 15 +++++++--------
6 files changed, 22 insertions(+), 17 deletions(-)
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index f2ea51fac56b..62027e60a936 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -1006,8 +1006,6 @@ void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip,
oi->__upperdentry = oip->upperdentry;
oi->oe = oip->oe;
oi->redirect = oip->redirect;
- if (oip->lowerdata)
- oi->lowerdata = igrab(d_inode(oip->lowerdata));
realinode = ovl_inode_real(inode);
ovl_copyattr(inode);
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c
index 4f332d3fad37..e2b3c8f6753a 100644
--- a/fs/overlayfs/namei.c
+++ b/fs/overlayfs/namei.c
@@ -1108,8 +1108,6 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
.oe = oe,
.index = index,
.redirect = upperredirect,
- .lowerdata = (ctr > 1 && !d.is_dir) ?
- stack[ctr - 1].dentry : NULL,
};
inode = ovl_get_inode(dentry->d_sb, &oip);
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 2c61e4383cf6..93ebc0edf4ef 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -656,7 +656,6 @@ struct ovl_inode_params {
struct ovl_entry *oe;
bool index;
char *redirect;
- struct dentry *lowerdata;
};
void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip,
unsigned long ino, int fsid);
diff --git a/fs/overlayfs/ovl_entry.h b/fs/overlayfs/ovl_entry.h
index 0bb8ab3aa8a7..548c93e030fc 100644
--- a/fs/overlayfs/ovl_entry.h
+++ b/fs/overlayfs/ovl_entry.h
@@ -125,6 +125,20 @@ static inline struct ovl_path *ovl_lowerpath(struct ovl_entry *oe)
return ovl_lowerstack(oe);
}
+static inline struct ovl_path *ovl_lowerdata(struct ovl_entry *oe)
+{
+ struct ovl_path *lowerstack = ovl_lowerstack(oe);
+
+ return lowerstack ? &lowerstack[oe->__numlower - 1] : NULL;
+}
+
+static inline struct dentry *ovl_lowerdata_dentry(struct ovl_entry *oe)
+{
+ struct ovl_path *lowerdata = ovl_lowerdata(oe);
+
+ return lowerdata ? lowerdata->dentry : NULL;
+}
+
/* private information held for every overlayfs dentry */
static inline unsigned long *OVL_E_FLAGS(struct dentry *dentry)
{
@@ -134,7 +148,7 @@ static inline unsigned long *OVL_E_FLAGS(struct dentry *dentry)
struct ovl_inode {
union {
struct ovl_dir_cache *cache; /* directory */
- struct inode *lowerdata; /* regular file */
+ /* place holder for non-dir */ /* regular file */
};
const char *redirect;
u64 version;
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index e3976ce279a8..1bfbdce2209a 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -172,7 +172,6 @@ static struct inode *ovl_alloc_inode(struct super_block *sb)
oi->flags = 0;
oi->__upperdentry = NULL;
oi->oe = NULL;
- oi->lowerdata = NULL;
mutex_init(&oi->lock);
return &oi->vfs_inode;
@@ -195,8 +194,6 @@ static void ovl_destroy_inode(struct inode *inode)
ovl_free_entry(oi->oe);
if (S_ISDIR(inode->i_mode))
ovl_dir_cache_free(inode);
- else
- iput(oi->lowerdata);
}
static void ovl_free_fs(struct ovl_fs *ofs)
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 21b2f479a46f..7495b4d378b0 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -225,11 +225,11 @@ void ovl_path_lower(struct dentry *dentry, struct path *path)
void ovl_path_lowerdata(struct dentry *dentry, struct path *path)
{
struct ovl_entry *oe = OVL_E(dentry);
- struct ovl_path *lowerstack = ovl_lowerstack(oe);
+ struct ovl_path *lowerdata = ovl_lowerdata(oe);
if (ovl_numlower(oe)) {
- path->mnt = lowerstack[ovl_numlower(oe) - 1].layer->mnt;
- path->dentry = lowerstack[ovl_numlower(oe) - 1].dentry;
+ path->mnt = lowerdata->layer->mnt;
+ path->dentry = lowerdata->dentry;
} else {
*path = (struct path) { };
}
@@ -288,10 +288,7 @@ const struct ovl_layer *ovl_layer_lower(struct dentry *dentry)
*/
struct dentry *ovl_dentry_lowerdata(struct dentry *dentry)
{
- struct ovl_entry *oe = OVL_E(dentry);
-
- return ovl_numlower(oe) ?
- ovl_lowerstack(oe)[ovl_numlower(oe) - 1].dentry : NULL;
+ return ovl_lowerdata_dentry(OVL_E(dentry));
}
struct dentry *ovl_dentry_real(struct dentry *dentry)
@@ -339,10 +336,12 @@ struct inode *ovl_inode_real(struct inode *inode)
/* Return inode which contains lower data. Do not return metacopy */
struct inode *ovl_inode_lowerdata(struct inode *inode)
{
+ struct dentry *lowerdata = ovl_lowerdata_dentry(OVL_I_E(inode));
+
if (WARN_ON(!S_ISREG(inode->i_mode)))
return NULL;
- return OVL_I(inode)->lowerdata ?: ovl_inode_lower(inode);
+ return lowerdata ? d_inode(lowerdata) : NULL;
}
/* Return real inode which contains data. Does not return metacopy inode */
--
2.34.1
next prev parent reply other threads:[~2023-04-27 13:05 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-27 13:05 [PATCH v2 00/13] Overlayfs lazy lookup of lowerdata Amir Goldstein
2023-04-27 13:05 ` [PATCH v2 01/13] ovl: update of dentry revalidate flags after copy up Amir Goldstein
2023-04-27 13:05 ` [PATCH v2 02/13] ovl: use OVL_E() and OVL_E_FLAGS() accessors Amir Goldstein
2023-04-27 13:05 ` [PATCH v2 03/13] ovl: use ovl_numlower() and ovl_lowerstack() accessors Amir Goldstein
2023-04-27 13:05 ` [PATCH v2 04/13] ovl: factor out ovl_free_entry() and ovl_stack_*() helpers Amir Goldstein
2023-04-27 13:05 ` [PATCH v2 05/13] ovl: move ovl_entry into ovl_inode Amir Goldstein
2023-04-27 13:05 ` [PATCH v2 06/13] ovl: deduplicate lowerpath and lowerstack[] Amir Goldstein
2023-04-27 13:05 ` Amir Goldstein [this message]
2023-04-27 13:05 ` [PATCH v2 08/13] ovl: remove unneeded goto instructions Amir Goldstein
2023-04-27 13:05 ` [PATCH v2 09/13] ovl: introduce data-only lower layers Amir Goldstein
2023-05-14 19:13 ` Amir Goldstein
2023-05-16 10:18 ` Amir Goldstein
2023-04-27 13:05 ` [PATCH v2 10/13] ovl: implement lookup in data-only layers Amir Goldstein
2023-04-27 13:05 ` [PATCH v2 11/13] ovl: prepare to store lowerdata redirect for lazy lowerdata lookup Amir Goldstein
2023-04-27 13:05 ` [PATCH v2 12/13] ovl: prepare for lazy lookup of lowerdata inode Amir Goldstein
2023-04-27 13:05 ` [PATCH v2 13/13] ovl: implement lazy lookup of lowerdata in data-only layers Amir Goldstein
2023-05-24 17:12 ` [PATCH v2 00/13] Overlayfs lazy lookup of lowerdata Amir Goldstein
2023-05-25 15:21 ` Alexander Larsson
2023-05-25 16:03 ` Amir Goldstein
2023-05-25 16:59 ` Giuseppe Scrivano
2023-05-25 17:27 ` Gao Xiang
2023-05-25 18:03 ` Gao Xiang
2023-05-26 5:12 ` Amir Goldstein
2023-05-26 11:36 ` Alexander Larsson
2023-05-26 18:27 ` Gao Xiang
2023-05-27 14:04 ` Amir Goldstein
2023-05-27 14:30 ` Gao Xiang
2023-05-29 7:22 ` Alexander Larsson
2023-05-30 14:08 ` Miklos Szeredi
2023-05-30 14:15 ` Amir Goldstein
2023-06-09 7:24 ` Miklos Szeredi
2023-06-09 10:54 ` Amir Goldstein
2023-06-09 13:42 ` Amir Goldstein
2023-06-09 13:52 ` Miklos Szeredi
2023-06-17 17:40 ` Amir Goldstein
2023-06-17 19:19 ` Miklos Szeredi
2023-05-30 16:19 ` Christian Brauner
2023-06-09 8:17 ` Alexander Larsson
2023-06-09 9:44 ` Christian Brauner
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