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From: Ronnie Sahlberg <lsahlber@redhat.com>
To: linux-cifs <linux-cifs@vger.kernel.org>
Cc: Steve French <smfrench@gmail.com>, Ronnie Sahlberg <lsahlber@redhat.com>
Subject: [PATCH 3/5] cifs: store a pointer to a fid in the cfid structure instead of the struct
Date: Thu, 25 Aug 2022 14:41:05 +1000	[thread overview]
Message-ID: <20220825044107.3703811-4-lsahlber@redhat.com> (raw)
In-Reply-To: <20220825044107.3703811-1-lsahlber@redhat.com>

also create a constructor that takes a path name and stores it in the fid.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
---
 fs/cifs/cached_dir.c | 63 ++++++++++++++++++++++++++++++++++++++------
 fs/cifs/cached_dir.h |  4 ++-
 2 files changed, 58 insertions(+), 9 deletions(-)

diff --git a/fs/cifs/cached_dir.c b/fs/cifs/cached_dir.c
index 4f3d88f3351b..0036ba6e0ab0 100644
--- a/fs/cifs/cached_dir.c
+++ b/fs/cifs/cached_dir.c
@@ -11,6 +11,8 @@
 #include "smb2proto.h"
 #include "cached_dir.h"
 
+struct cached_fid *init_cached_dir(const char *path);
+
 /*
  * Open the and cache a directory handle.
  * If error then *cfid is not initialized.
@@ -52,7 +54,14 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
 	else
 		return -ENOENT;
 
-	cfid = &tcon->cfids->cfid;
+	cfid = tcon->cfids->cfid;
+	if (cfid == NULL) {
+		cfid = init_cached_dir(path);
+		tcon->cfids->cfid = cfid;
+	}
+	if (cfid == NULL)
+		return -ENOMEM;
+
 	mutex_lock(&cfid->fid_mutex);
 	if (cfid->is_valid) {
 		cifs_dbg(FYI, "found a cached root file handle\n");
@@ -227,7 +236,9 @@ int open_cached_dir_by_dentry(struct cifs_tcon *tcon,
 {
 	struct cached_fid *cfid;
 
-	cfid = &tcon->cfids->cfid;
+	cfid = tcon->cfids->cfid;
+	if (cfid == NULL)
+		return -ENOENT;
 
 	mutex_lock(&cfid->fid_mutex);
 	if (cfid->dentry == dentry) {
@@ -321,7 +332,9 @@ void close_all_cached_dirs(struct cifs_sb_info *cifs_sb)
 		tcon = tlink_tcon(tlink);
 		if (IS_ERR(tcon))
 			continue;
-		cfid = &tcon->cfids->cfid;
+		cfid = tcon->cfids->cfid;
+		if (cfid == NULL)
+			continue;
 		mutex_lock(&cfid->fid_mutex);
 		if (cfid->dentry) {
 			dput(cfid->dentry);
@@ -337,7 +350,10 @@ void close_all_cached_dirs(struct cifs_sb_info *cifs_sb)
  */
 void invalidate_all_cached_dirs(struct cifs_tcon *tcon)
 {
-	struct cached_fid *cfid = &tcon->cfids->cfid;
+	struct cached_fid *cfid = tcon->cfids->cfid;
+
+	if (cfid == NULL)
+		return;
 
 	mutex_lock(&cfid->fid_mutex);
 	cfid->is_valid = false;
@@ -358,7 +374,10 @@ smb2_cached_lease_break(struct work_struct *work)
 
 int cached_dir_lease_break(struct cifs_tcon *tcon, __u8 lease_key[16])
 {
-	struct cached_fid *cfid = &tcon->cfids->cfid;
+	struct cached_fid *cfid = tcon->cfids->cfid;
+
+	if (cfid == NULL)
+		return false;
 
 	if (cfid->is_valid &&
 	    !memcmp(lease_key,
@@ -374,6 +393,32 @@ int cached_dir_lease_break(struct cifs_tcon *tcon, __u8 lease_key[16])
 	return false;
 }
 
+struct cached_fid *init_cached_dir(const char *path)
+{
+	struct cached_fid *cfid;
+
+	cfid = kzalloc(sizeof(*cfid), GFP_KERNEL);
+	if (!cfid)
+		return NULL;
+	cfid->path = kstrdup(path, GFP_KERNEL);
+	if (!cfid->path) {
+		kfree(cfid);
+		return NULL;
+	}
+
+	INIT_LIST_HEAD(&cfid->dirents.entries);
+	mutex_init(&cfid->dirents.de_mutex);
+	mutex_init(&cfid->fid_mutex);
+	return cfid;
+}
+
+void free_cached_dir(struct cached_fid *cfid)
+{
+	kfree(cfid->path);
+	cfid->path = NULL;
+	kfree(cfid);
+}
+
 struct cached_fids *init_cached_dirs(void)
 {
 	struct cached_fids *cfids;
@@ -381,13 +426,15 @@ struct cached_fids *init_cached_dirs(void)
 	cfids = kzalloc(sizeof(*cfids), GFP_KERNEL);
 	if (!cfids)
 		return NULL;
-	INIT_LIST_HEAD(&cfids->cfid.dirents.entries);
-	mutex_init(&cfids->cfid.dirents.de_mutex);
-	mutex_init(&cfids->cfid.fid_mutex);
+	mutex_init(&cfids->cfid_list_mutex);
 	return cfids;
 }
 
 void free_cached_dirs(struct cached_fids *cfids)
 {
+	if (cfids->cfid) {
+		free_cached_dir(cfids->cfid);
+		cfids->cfid = NULL;
+	}
 	kfree(cfids);
 }
diff --git a/fs/cifs/cached_dir.h b/fs/cifs/cached_dir.h
index e430e1102296..bdf6c3866653 100644
--- a/fs/cifs/cached_dir.h
+++ b/fs/cifs/cached_dir.h
@@ -31,6 +31,7 @@ struct cached_dirents {
 };
 
 struct cached_fid {
+	const char *path;
 	bool is_valid:1;	/* Do we have a useable root fid */
 	bool file_all_info_is_valid:1;
 	bool has_lease:1;
@@ -46,7 +47,8 @@ struct cached_fid {
 };
 
 struct cached_fids {
-	struct cached_fid cfid;
+	struct mutex cfid_list_mutex;
+	struct cached_fid *cfid;
 };
 
 extern struct cached_fids *init_cached_dirs(void);
-- 
2.35.3


  parent reply	other threads:[~2022-08-25  4:41 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-25  4:41 Directory caching, v2 Ronnie Sahlberg
2022-08-25  4:41 ` [PATCH 1/5] cifs: Make tcon contain a wrapper structure cached_fids instead of cached_fid Ronnie Sahlberg
2022-08-25  4:41 ` [PATCH 2/5] cifs: cifs: handlecache, only track the dentry for the root handle Ronnie Sahlberg
2022-08-25  4:41 ` Ronnie Sahlberg [this message]
2022-08-25  4:41 ` [PATCH 4/5] cifs: enable caching of directories for which a lease is held Ronnie Sahlberg
2022-08-25  4:41 ` [PATCH 5/5] cifs: find and use the dentry for cached non-root directories also Ronnie Sahlberg

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