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Message-Id: <11578608651017-git-send-email-ebiederm@xmission.com>
Date: Sat, 9 Sep 2006 22:01:03 -0600
From: "Eric W. Biederman" <ebiederm@...ssion.com>
To: Andrew Morton <akpm@...l.org>
Cc: <linux-kernel@...r.kernel.org>,
Jan Engelhardt <jengelh@...ux01.gwdg.de>,
"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 2/4] proc: Remove trailing blank entry from pid_entry arrays.
It was pointed out that since I am taking ARRAY_SIZE anyway
the trailing empty entry is silly and just wastes space.
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
fs/proc/base.c | 39 +++++++++++++++++++++------------------
1 files changed, 21 insertions(+), 18 deletions(-)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index c4fcd64..725e279 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1377,12 +1377,13 @@ out:
/* SMP-safe */
static struct dentry *proc_pident_lookup(struct inode *dir,
struct dentry *dentry,
- struct pid_entry *ents)
+ struct pid_entry *ents,
+ unsigned int nents)
{
struct inode *inode;
struct dentry *error;
struct task_struct *task = get_proc_task(dir);
- struct pid_entry *p;
+ struct pid_entry *p, *last;
error = ERR_PTR(-ENOENT);
inode = NULL;
@@ -1394,13 +1395,14 @@ static struct dentry *proc_pident_lookup
* Yes, it does not scale. And it should not. Don't add
* new entries into /proc/<tgid>/ without very good reasons.
*/
- for (p = ents; p->name; p++) {
+ last = &ents[nents - 1];
+ for (p = ents; p <= last; p++) {
if (p->len != dentry->d_name.len)
continue;
if (!memcmp(dentry->d_name.name, p->name, p->len))
break;
}
- if (!p->name)
+ if (p > last)
goto out;
error = proc_pident_instantiate(dir, dentry, task, p);
@@ -1426,7 +1428,7 @@ static int proc_pident_readdir(struct fi
struct dentry *dentry = filp->f_dentry;
struct inode *inode = dentry->d_inode;
struct task_struct *task = get_proc_task(inode);
- struct pid_entry *p;
+ struct pid_entry *p, *last;
ino_t ino;
int ret;
@@ -1459,7 +1461,8 @@ static int proc_pident_readdir(struct fi
goto out;
}
p = ents + i;
- while (p->name) {
+ last = &ents[nents - 1];
+ while (p <= last) {
if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
goto out;
filp->f_pos++;
@@ -1556,7 +1559,6 @@ static struct pid_entry attr_dir_stuff[]
REG("fscreate", S_IRUGO|S_IWUGO, pid_attr),
REG("keycreate", S_IRUGO|S_IWUGO, pid_attr),
REG("sockcreate", S_IRUGO|S_IWUGO, pid_attr),
- {}
};
static int proc_attr_dir_readdir(struct file * filp,
@@ -1574,7 +1576,8 @@ static struct file_operations proc_attr_
static struct dentry *proc_attr_dir_lookup(struct inode *dir,
struct dentry *dentry, struct nameidata *nd)
{
- return proc_pident_lookup(dir, dentry, attr_dir_stuff);
+ return proc_pident_lookup(dir, dentry,
+ attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
}
static struct inode_operations proc_attr_dir_inode_operations = {
@@ -1618,7 +1621,6 @@ static struct inode_operations proc_self
static struct pid_entry proc_base_stuff[] = {
NOD("self", S_IFLNK|S_IRWXUGO,
&proc_self_inode_operations, NULL, {}),
- {}
};
/*
@@ -1695,7 +1697,7 @@ static struct dentry *proc_base_lookup(s
{
struct dentry *error;
struct task_struct *task = get_proc_task(dir);
- struct pid_entry *p;
+ struct pid_entry *p, *last;
error = ERR_PTR(-ENOENT);
@@ -1703,13 +1705,14 @@ static struct dentry *proc_base_lookup(s
goto out_no_task;
/* Lookup the directory entry */
- for (p = proc_base_stuff; p->name; p++) {
+ last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
+ for (p = proc_base_stuff; p <= last; p++) {
if (p->len != dentry->d_name.len)
continue;
if (!memcmp(dentry->d_name.name, p->name, p->len))
break;
}
- if (!p->name)
+ if (p > last)
goto out;
error = proc_base_instantiate(dir, dentry, task, p);
@@ -1775,7 +1778,6 @@ #endif
#ifdef CONFIG_AUDITSYSCALL
REG("loginuid", S_IWUSR|S_IRUGO, loginuid),
#endif
- {}
};
static int proc_tgid_base_readdir(struct file * filp,
@@ -1791,7 +1793,8 @@ static struct file_operations proc_tgid_
};
static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
- return proc_pident_lookup(dir, dentry, tgid_base_stuff);
+ return proc_pident_lookup(dir, dentry,
+ tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
}
static struct inode_operations proc_tgid_base_inode_operations = {
@@ -1961,7 +1964,7 @@ retry:
return task;
}
-#define TGID_OFFSET (FIRST_PROCESS_ENTRY + (ARRAY_SIZE(proc_base_stuff) - 1))
+#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
struct task_struct *task, int tgid)
@@ -1983,7 +1986,7 @@ int proc_pid_readdir(struct file * filp,
if (!reaper)
goto out_no_task;
- for (; nr < (ARRAY_SIZE(proc_base_stuff) - 1); filp->f_pos++, nr++) {
+ for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
struct pid_entry *p = &proc_base_stuff[nr];
if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
goto out;
@@ -2050,7 +2053,6 @@ #endif
#ifdef CONFIG_AUDITSYSCALL
REG("loginuid", S_IWUSR|S_IRUGO, loginuid),
#endif
- {}
};
static int proc_tid_base_readdir(struct file * filp,
@@ -2061,7 +2063,8 @@ static int proc_tid_base_readdir(struct
}
static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
- return proc_pident_lookup(dir, dentry, tid_base_stuff);
+ return proc_pident_lookup(dir, dentry,
+ tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
}
static struct file_operations proc_tid_base_operations = {
--
1.4.2.rc3.g7e18e-dirty
-
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