[RFA][PATCH 7/8] fs: Convert show_fdinfo functions to void
From: Steven Rostedt
Date: Wed Oct 29 2014 - 18:03:13 EST
From: Joe Perches <joe@xxxxxxxxxxx>
[ REQUEST FOR ACKS ]
seq_printf functions shouldn't really check the return value.
Checking seq_has_overflowed() occasionally is used instead.
Update vfs documentation.
Link: http://lkml.kernel.org/p/e37e6e7b76acbdcc3bb4ab2a57c8f8ca1ae11b9a.1412031505.git.joe@xxxxxxxxxxx
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Joe Perches <joe@xxxxxxxxxxx>
[ did a few clean ups ]
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
Documentation/filesystems/vfs.txt | 2 +-
drivers/net/tun.c | 4 +-
fs/eventfd.c | 9 ++---
fs/eventpoll.c | 13 +++----
fs/notify/fdinfo.c | 78 ++++++++++++++++-----------------------
fs/notify/fdinfo.h | 4 +-
fs/proc/fd.c | 3 +-
fs/signalfd.c | 4 +-
fs/timerfd.c | 27 +++++++-------
include/linux/fs.h | 2 +-
10 files changed, 63 insertions(+), 83 deletions(-)
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index fceff7c00a3c..af1dbc1823bb 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -828,7 +828,7 @@ struct file_operations {
ssize_t (*splice_read)(struct file *, struct pipe_inode_info *, size_t, unsigned int);
int (*setlease)(struct file *, long arg, struct file_lock **, void **);
long (*fallocate)(struct file *, int mode, loff_t offset, loff_t len);
- int (*show_fdinfo)(struct seq_file *m, struct file *f);
+ void (*show_fdinfo)(struct seq_file *m, struct file *f);
};
Again, all methods are called without any locks being held, unless
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 186ce541c657..a3420e091689 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2209,7 +2209,7 @@ static int tun_chr_close(struct inode *inode, struct file *file)
}
#ifdef CONFIG_PROC_FS
-static int tun_chr_show_fdinfo(struct seq_file *m, struct file *f)
+static void tun_chr_show_fdinfo(struct seq_file *m, struct file *f)
{
struct tun_struct *tun;
struct ifreq ifr;
@@ -2225,7 +2225,7 @@ static int tun_chr_show_fdinfo(struct seq_file *m, struct file *f)
if (tun)
tun_put(tun);
- return seq_printf(m, "iff:\t%s\n", ifr.ifr_name);
+ seq_printf(m, "iff:\t%s\n", ifr.ifr_name);
}
#endif
diff --git a/fs/eventfd.c b/fs/eventfd.c
index d6a88e7812f3..4b0a226024fa 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -287,17 +287,14 @@ static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t c
}
#ifdef CONFIG_PROC_FS
-static int eventfd_show_fdinfo(struct seq_file *m, struct file *f)
+static void eventfd_show_fdinfo(struct seq_file *m, struct file *f)
{
struct eventfd_ctx *ctx = f->private_data;
- int ret;
spin_lock_irq(&ctx->wqh.lock);
- ret = seq_printf(m, "eventfd-count: %16llx\n",
- (unsigned long long)ctx->count);
+ seq_printf(m, "eventfd-count: %16llx\n",
+ (unsigned long long)ctx->count);
spin_unlock_irq(&ctx->wqh.lock);
-
- return ret;
}
#endif
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 7bcfff900f05..d77f94491352 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -870,25 +870,22 @@ static unsigned int ep_eventpoll_poll(struct file *file, poll_table *wait)
}
#ifdef CONFIG_PROC_FS
-static int ep_show_fdinfo(struct seq_file *m, struct file *f)
+static void ep_show_fdinfo(struct seq_file *m, struct file *f)
{
struct eventpoll *ep = f->private_data;
struct rb_node *rbp;
- int ret = 0;
mutex_lock(&ep->mtx);
for (rbp = rb_first(&ep->rbr); rbp; rbp = rb_next(rbp)) {
struct epitem *epi = rb_entry(rbp, struct epitem, rbn);
- ret = seq_printf(m, "tfd: %8d events: %8x data: %16llx\n",
- epi->ffd.fd, epi->event.events,
- (long long)epi->event.data);
- if (ret)
+ seq_printf(m, "tfd: %8d events: %8x data: %16llx\n",
+ epi->ffd.fd, epi->event.events,
+ (long long)epi->event.data);
+ if (seq_has_overflowed(m))
break;
}
mutex_unlock(&ep->mtx);
-
- return ret;
}
#endif
diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c
index 9d7e2b9659cb..6ffd220eb14d 100644
--- a/fs/notify/fdinfo.c
+++ b/fs/notify/fdinfo.c
@@ -20,25 +20,24 @@
#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
-static int show_fdinfo(struct seq_file *m, struct file *f,
- int (*show)(struct seq_file *m, struct fsnotify_mark *mark))
+static void show_fdinfo(struct seq_file *m, struct file *f,
+ void (*show)(struct seq_file *m,
+ struct fsnotify_mark *mark))
{
struct fsnotify_group *group = f->private_data;
struct fsnotify_mark *mark;
- int ret = 0;
mutex_lock(&group->mark_mutex);
list_for_each_entry(mark, &group->marks_list, g_list) {
- ret = show(m, mark);
- if (ret)
+ show(m, mark);
+ if (seq_has_overflowed(m))
break;
}
mutex_unlock(&group->mark_mutex);
- return ret;
}
#if defined(CONFIG_EXPORTFS)
-static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
+static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
{
struct {
struct file_handle handle;
@@ -52,71 +51,62 @@ static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, 0);
if ((ret == FILEID_INVALID) || (ret < 0)) {
WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
- return 0;
+ return;
}
f.handle.handle_type = ret;
f.handle.handle_bytes = size * sizeof(u32);
- ret = seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
- f.handle.handle_bytes, f.handle.handle_type);
+ seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
+ f.handle.handle_bytes, f.handle.handle_type);
for (i = 0; i < f.handle.handle_bytes; i++)
- ret |= seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
-
- return ret;
+ seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
}
#else
-static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
+static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
{
- return 0;
}
#endif
#ifdef CONFIG_INOTIFY_USER
-static int inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
+static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
{
struct inotify_inode_mark *inode_mark;
struct inode *inode;
- int ret = 0;
if (!(mark->flags & (FSNOTIFY_MARK_FLAG_ALIVE | FSNOTIFY_MARK_FLAG_INODE)))
- return 0;
+ return;
inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
inode = igrab(mark->i.inode);
if (inode) {
- ret = seq_printf(m, "inotify wd:%x ino:%lx sdev:%x "
- "mask:%x ignored_mask:%x ",
- inode_mark->wd, inode->i_ino,
- inode->i_sb->s_dev,
- mark->mask, mark->ignored_mask);
- ret |= show_mark_fhandle(m, inode);
- ret |= seq_putc(m, '\n');
+ seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
+ inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
+ mark->mask, mark->ignored_mask);
+ show_mark_fhandle(m, inode);
+ seq_putc(m, '\n');
iput(inode);
}
-
- return ret;
}
-int inotify_show_fdinfo(struct seq_file *m, struct file *f)
+void inotify_show_fdinfo(struct seq_file *m, struct file *f)
{
- return show_fdinfo(m, f, inotify_fdinfo);
+ show_fdinfo(m, f, inotify_fdinfo);
}
#endif /* CONFIG_INOTIFY_USER */
#ifdef CONFIG_FANOTIFY
-static int fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
+static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
{
unsigned int mflags = 0;
struct inode *inode;
- int ret = 0;
if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE))
- return 0;
+ return;
if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
@@ -124,26 +114,22 @@ static int fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
inode = igrab(mark->i.inode);
if (!inode)
- goto out;
- ret = seq_printf(m, "fanotify ino:%lx sdev:%x "
- "mflags:%x mask:%x ignored_mask:%x ",
- inode->i_ino, inode->i_sb->s_dev,
- mflags, mark->mask, mark->ignored_mask);
- ret |= show_mark_fhandle(m, inode);
- ret |= seq_putc(m, '\n');
+ return;
+ seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
+ inode->i_ino, inode->i_sb->s_dev,
+ mflags, mark->mask, mark->ignored_mask);
+ show_mark_fhandle(m, inode);
+ seq_putc(m, '\n');
iput(inode);
} else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) {
struct mount *mnt = real_mount(mark->m.mnt);
- ret = seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x "
- "ignored_mask:%x\n", mnt->mnt_id, mflags,
- mark->mask, mark->ignored_mask);
+ seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
+ mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
}
-out:
- return ret;
}
-int fanotify_show_fdinfo(struct seq_file *m, struct file *f)
+void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
{
struct fsnotify_group *group = f->private_data;
unsigned int flags = 0;
@@ -169,7 +155,7 @@ int fanotify_show_fdinfo(struct seq_file *m, struct file *f)
seq_printf(m, "fanotify flags:%x event-flags:%x\n",
flags, group->fanotify_data.f_flags);
- return show_fdinfo(m, f, fanotify_fdinfo);
+ show_fdinfo(m, f, fanotify_fdinfo);
}
#endif /* CONFIG_FANOTIFY */
diff --git a/fs/notify/fdinfo.h b/fs/notify/fdinfo.h
index 556afda990e9..9664c4904d6b 100644
--- a/fs/notify/fdinfo.h
+++ b/fs/notify/fdinfo.h
@@ -10,11 +10,11 @@ struct file;
#ifdef CONFIG_PROC_FS
#ifdef CONFIG_INOTIFY_USER
-extern int inotify_show_fdinfo(struct seq_file *m, struct file *f);
+void inotify_show_fdinfo(struct seq_file *m, struct file *f);
#endif
#ifdef CONFIG_FANOTIFY
-extern int fanotify_show_fdinfo(struct seq_file *m, struct file *f);
+void fanotify_show_fdinfo(struct seq_file *m, struct file *f);
#endif
#else /* CONFIG_PROC_FS */
diff --git a/fs/proc/fd.c b/fs/proc/fd.c
index e11d7c590bb0..8e5ad83b629a 100644
--- a/fs/proc/fd.c
+++ b/fs/proc/fd.c
@@ -53,7 +53,8 @@ static int seq_show(struct seq_file *m, void *v)
(long long)file->f_pos, f_flags,
real_mount(file->f_path.mnt)->mnt_id);
if (file->f_op->show_fdinfo)
- ret = file->f_op->show_fdinfo(m, file);
+ file->f_op->show_fdinfo(m, file);
+ ret = seq_has_overflowed(m);
fput(file);
}
diff --git a/fs/signalfd.c b/fs/signalfd.c
index 424b7b65321f..7e412ad74836 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.c
@@ -230,7 +230,7 @@ static ssize_t signalfd_read(struct file *file, char __user *buf, size_t count,
}
#ifdef CONFIG_PROC_FS
-static int signalfd_show_fdinfo(struct seq_file *m, struct file *f)
+static void signalfd_show_fdinfo(struct seq_file *m, struct file *f)
{
struct signalfd_ctx *ctx = f->private_data;
sigset_t sigmask;
@@ -238,8 +238,6 @@ static int signalfd_show_fdinfo(struct seq_file *m, struct file *f)
sigmask = ctx->sigmask;
signotset(&sigmask);
render_sigset_t(m, "sigmask:\t", &sigmask);
-
- return 0;
}
#endif
diff --git a/fs/timerfd.c b/fs/timerfd.c
index b46ffa94372a..b94fa6c3c6eb 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -288,7 +288,7 @@ static ssize_t timerfd_read(struct file *file, char __user *buf, size_t count,
}
#ifdef CONFIG_PROC_FS
-static int timerfd_show(struct seq_file *m, struct file *file)
+static void timerfd_show(struct seq_file *m, struct file *file)
{
struct timerfd_ctx *ctx = file->private_data;
struct itimerspec t;
@@ -298,18 +298,19 @@ static int timerfd_show(struct seq_file *m, struct file *file)
t.it_interval = ktime_to_timespec(ctx->tintv);
spin_unlock_irq(&ctx->wqh.lock);
- return seq_printf(m,
- "clockid: %d\n"
- "ticks: %llu\n"
- "settime flags: 0%o\n"
- "it_value: (%llu, %llu)\n"
- "it_interval: (%llu, %llu)\n",
- ctx->clockid, (unsigned long long)ctx->ticks,
- ctx->settime_flags,
- (unsigned long long)t.it_value.tv_sec,
- (unsigned long long)t.it_value.tv_nsec,
- (unsigned long long)t.it_interval.tv_sec,
- (unsigned long long)t.it_interval.tv_nsec);
+ seq_printf(m,
+ "clockid: %d\n"
+ "ticks: %llu\n"
+ "settime flags: 0%o\n"
+ "it_value: (%llu, %llu)\n"
+ "it_interval: (%llu, %llu)\n",
+ ctx->clockid,
+ (unsigned long long)ctx->ticks,
+ ctx->settime_flags,
+ (unsigned long long)t.it_value.tv_sec,
+ (unsigned long long)t.it_value.tv_nsec,
+ (unsigned long long)t.it_interval.tv_sec,
+ (unsigned long long)t.it_interval.tv_nsec);
}
#else
#define timerfd_show NULL
diff --git a/include/linux/fs.h b/include/linux/fs.h
index a957d4366c24..01dd9052a142 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1491,7 +1491,7 @@ struct file_operations {
int (*setlease)(struct file *, long, struct file_lock **, void **);
long (*fallocate)(struct file *file, int mode, loff_t offset,
loff_t len);
- int (*show_fdinfo)(struct seq_file *m, struct file *f);
+ void (*show_fdinfo)(struct seq_file *m, struct file *f);
};
struct inode_operations {
--
2.1.1
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