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[PATCH] proc: remove trailing blank entry from pid_entry arrays
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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@xmission.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Eric W. Biederman authored and Linus Torvalds committed Oct 2, 2006
1 parent 8e95bd9 commit 7bcd6b0
Showing 1 changed file with 21 additions and 18 deletions.
39 changes: 21 additions & 18 deletions fs/proc/base.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1377,12 +1377,13 @@ static struct dentry *proc_pident_instantiate(struct inode *dir,
/* 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;
Expand All @@ -1394,13 +1395,14 @@ static struct dentry *proc_pident_lookup(struct inode *dir,
* 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);
Expand All @@ -1426,7 +1428,7 @@ static int proc_pident_readdir(struct file *filp,
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;

Expand Down Expand Up @@ -1459,7 +1461,8 @@ static int proc_pident_readdir(struct file *filp,
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++;
Expand Down Expand Up @@ -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,
Expand All @@ -1574,7 +1576,8 @@ static struct file_operations proc_attr_dir_operations = {
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 = {
Expand Down Expand Up @@ -1618,7 +1621,6 @@ static struct inode_operations proc_self_inode_operations = {
static struct pid_entry proc_base_stuff[] = {
NOD("self", S_IFLNK|S_IRWXUGO,
&proc_self_inode_operations, NULL, {}),
{}
};

/*
Expand Down Expand Up @@ -1695,21 +1697,22 @@ static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
{
struct dentry *error;
struct task_struct *task = get_proc_task(dir);
struct pid_entry *p;
struct pid_entry *p, *last;

error = ERR_PTR(-ENOENT);

if (!task)
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);
Expand Down Expand Up @@ -1775,7 +1778,6 @@ static struct pid_entry tgid_base_stuff[] = {
#ifdef CONFIG_AUDITSYSCALL
REG("loginuid", S_IWUSR|S_IRUGO, loginuid),
#endif
{}
};

static int proc_tgid_base_readdir(struct file * filp,
Expand All @@ -1791,7 +1793,8 @@ static struct file_operations proc_tgid_base_operations = {
};

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 = {
Expand Down Expand Up @@ -1961,7 +1964,7 @@ static struct task_struct *next_tgid(unsigned int tgid)
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)
Expand All @@ -1983,7 +1986,7 @@ int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
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;
Expand Down Expand Up @@ -2050,7 +2053,6 @@ static struct pid_entry tid_base_stuff[] = {
#ifdef CONFIG_AUDITSYSCALL
REG("loginuid", S_IWUSR|S_IRUGO, loginuid),
#endif
{}
};

static int proc_tid_base_readdir(struct file * filp,
Expand All @@ -2061,7 +2063,8 @@ static int proc_tid_base_readdir(struct file * filp,
}

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 = {
Expand Down

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