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Message-ID: <20240118094645.58edbfb7@gandalf.local.home>
Date: Thu, 18 Jan 2024 09:46:45 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Masami Hiramatsu
<mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Erick Archer <erick.archer@....com>, Nathan Lynch <nathanl@...ux.ibm.com>
Subject: [GIT PULL] eventfs: Fix for readdir and a seq_buf fix
Linus,
This includes the fix to eventfs that we discussed. It removes the creation
of dentries/inodes from the readdir() logic. I also threw in a seq_buf fix
that was sent to me not to long ago.
More eventfs fixes and a seq_buf fix for 6.8:
- Hard-code the inodes for eventfs to the same number for files, and
the same number for directories.
- Have getdent() not create dentries/inodes in iterate_shared() as now
it has hard-coded inode numbers
- Use kcalloc() instead of kzalloc() on a list of elements
- Fix seq_buf warning and make static work properly.
Please pull the latest eventfs-v6.8-2 tree, which can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
eventfs-v6.8-2
Tag SHA1: 09d733778820003cca5836364cbc0b162d70bb7e
Head SHA1: 7a8e9cdf9405819105ae7405cd91e482bf574b01
Erick Archer (1):
eventfs: Use kcalloc() instead of kzalloc()
Nathan Lynch (1):
seq_buf: Make DECLARE_SEQ_BUF() usable
Steven Rostedt (Google) (2):
eventfs: Have the inodes all for files and directories all be the same
eventfs: Do not create dentries nor inodes in iterate_shared
----
fs/tracefs/event_inode.c | 36 ++++++++++++++++++------------------
include/linux/seq_buf.h | 3 +--
2 files changed, 19 insertions(+), 20 deletions(-)
---------------------------
diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c
index fdff53d5a1f8..6795fda2af19 100644
--- a/fs/tracefs/event_inode.c
+++ b/fs/tracefs/event_inode.c
@@ -32,6 +32,10 @@
*/
static DEFINE_MUTEX(eventfs_mutex);
+/* Choose something "unique" ;-) */
+#define EVENTFS_FILE_INODE_INO 0x12c4e37
+#define EVENTFS_DIR_INODE_INO 0x134b2f5
+
/*
* The eventfs_inode (ei) itself is protected by SRCU. It is released from
* its parent's list and will have is_freed set (under eventfs_mutex).
@@ -93,7 +97,7 @@ static int eventfs_set_attr(struct mnt_idmap *idmap, struct dentry *dentry,
/* Preallocate the children mode array if necessary */
if (!(dentry->d_inode->i_mode & S_IFDIR)) {
if (!ei->entry_attrs) {
- ei->entry_attrs = kzalloc(sizeof(*ei->entry_attrs) * ei->nr_entries,
+ ei->entry_attrs = kcalloc(ei->nr_entries, sizeof(*ei->entry_attrs),
GFP_NOFS);
if (!ei->entry_attrs) {
ret = -ENOMEM;
@@ -352,6 +356,9 @@ static struct dentry *create_file(const char *name, umode_t mode,
inode->i_fop = fop;
inode->i_private = data;
+ /* All files will have the same inode number */
+ inode->i_ino = EVENTFS_FILE_INODE_INO;
+
ti = get_tracefs(inode);
ti->flags |= TRACEFS_EVENT_INODE;
d_instantiate(dentry, inode);
@@ -388,6 +395,9 @@ static struct dentry *create_dir(struct eventfs_inode *ei, struct dentry *parent
inode->i_op = &eventfs_root_dir_inode_operations;
inode->i_fop = &eventfs_file_operations;
+ /* All directories will have the same inode number */
+ inode->i_ino = EVENTFS_DIR_INODE_INO;
+
ti = get_tracefs(inode);
ti->flags |= TRACEFS_EVENT_INODE;
@@ -717,8 +727,6 @@ static int eventfs_iterate(struct file *file, struct dir_context *ctx)
struct eventfs_inode *ei_child;
struct tracefs_inode *ti;
struct eventfs_inode *ei;
- struct dentry *ei_dentry = NULL;
- struct dentry *dentry;
const char *name;
umode_t mode;
int idx;
@@ -739,11 +747,11 @@ static int eventfs_iterate(struct file *file, struct dir_context *ctx)
mutex_lock(&eventfs_mutex);
ei = READ_ONCE(ti->private);
- if (ei && !ei->is_freed)
- ei_dentry = READ_ONCE(ei->dentry);
+ if (ei && ei->is_freed)
+ ei = NULL;
mutex_unlock(&eventfs_mutex);
- if (!ei || !ei_dentry)
+ if (!ei)
goto out;
/*
@@ -770,11 +778,7 @@ static int eventfs_iterate(struct file *file, struct dir_context *ctx)
if (r <= 0)
continue;
- dentry = create_file_dentry(ei, i, ei_dentry, name, mode, cdata, fops);
- if (!dentry)
- goto out;
- ino = dentry->d_inode->i_ino;
- dput(dentry);
+ ino = EVENTFS_FILE_INODE_INO;
if (!dir_emit(ctx, name, strlen(name), ino, DT_REG))
goto out;
@@ -798,11 +802,7 @@ static int eventfs_iterate(struct file *file, struct dir_context *ctx)
name = ei_child->name;
- dentry = create_dir_dentry(ei, ei_child, ei_dentry);
- if (!dentry)
- goto out_dec;
- ino = dentry->d_inode->i_ino;
- dput(dentry);
+ ino = EVENTFS_DIR_INODE_INO;
if (!dir_emit(ctx, name, strlen(name), ino, DT_DIR))
goto out_dec;
@@ -874,7 +874,7 @@ struct eventfs_inode *eventfs_create_dir(const char *name, struct eventfs_inode
}
if (size) {
- ei->d_children = kzalloc(sizeof(*ei->d_children) * size, GFP_KERNEL);
+ ei->d_children = kcalloc(size, sizeof(*ei->d_children), GFP_KERNEL);
if (!ei->d_children) {
kfree_const(ei->name);
kfree(ei);
@@ -941,7 +941,7 @@ struct eventfs_inode *eventfs_create_events_dir(const char *name, struct dentry
goto fail;
if (size) {
- ei->d_children = kzalloc(sizeof(*ei->d_children) * size, GFP_KERNEL);
+ ei->d_children = kcalloc(size, sizeof(*ei->d_children), GFP_KERNEL);
if (!ei->d_children)
goto fail;
}
diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
index 5fb1f12c33f9..c44f4b47b945 100644
--- a/include/linux/seq_buf.h
+++ b/include/linux/seq_buf.h
@@ -22,9 +22,8 @@ struct seq_buf {
};
#define DECLARE_SEQ_BUF(NAME, SIZE) \
- char __ ## NAME ## _buffer[SIZE] = ""; \
struct seq_buf NAME = { \
- .buffer = &__ ## NAME ## _buffer, \
+ .buffer = (char[SIZE]) { 0 }, \
.size = SIZE, \
}
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