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From: "Eric W. Biederman" <ebiederm@xmission.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: <linux-kernel@vger.kernel.org>, <linux-pci@vger.kernel.org>,
	<linux-mm@kvack.org>, <linux-fsdevel@vger.kernel.org>,
	Hugh Dickins <hugh@veritas.com>, Tejun Heo <tj@kernel.org>,
	Alexey Dobriyan <adobriyan@gmail.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Greg Kroah-Hartman <gregkh@suse.de>,
	Nick Piggin <npiggin@suse.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Christoph Hellwig <hch@infradead.org>,
	"Eric W. Biederman" <ebiederm@maxwell.arastra.com>,
	"Eric W. Biederman" <ebiederm@aristanetworks.com>
Subject: [PATCH 06/23] vfs: Teach read/write to use file_hotplug_read_lock
Date: Mon,  1 Jun 2009 14:50:31 -0700
Message-ID: <1243893048-17031-6-git-send-email-ebiederm@xmission.com> (raw)
In-Reply-To: <m1oct739xu.fsf@fess.ebiederm.org>

From: Eric W. Biederman <ebiederm@maxwell.arastra.com>

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
---
 fs/compat.c     |   16 +++++++++++-
 fs/read_write.c |   70 +++++++++++++++++++++++++++++++++++++++++++++---------
 2 files changed, 72 insertions(+), 14 deletions(-)

diff --git a/fs/compat.c b/fs/compat.c
index 25be41c..dad9957 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1196,12 +1196,18 @@ static size_t compat_readv(struct file *file,
 	if (!(file->f_mode & FMODE_READ))
 		goto out;
 
+	ret = -EIO;
+	if (!file_hotplug_read_trylock(file))
+		goto out;
+
 	ret = -EINVAL;
 	if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
-		goto out;
+		goto out_unlock;
 
 	ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
 
+out_unlock:
+	file_hotplug_read_unlock(file);
 out:
 	if (ret > 0)
 		add_rchar(current, ret);
@@ -1253,12 +1259,18 @@ static size_t compat_writev(struct file *file,
 	if (!(file->f_mode & FMODE_WRITE))
 		goto out;
 
+	ret = -EIO;
+	if (!file_hotplug_read_trylock(file))
+		goto out;
+
 	ret = -EINVAL;
 	if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
-		goto out;
+		goto out_unlock;
 
 	ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
 
+out_unlock:
+	file_hotplug_read_unlock(file);
 out:
 	if (ret > 0)
 		add_wchar(current, ret);
diff --git a/fs/read_write.c b/fs/read_write.c
index c9511ce..718baea 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -288,12 +288,18 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
 {
 	ssize_t ret;
 
+	ret = -EBADF;
 	if (!(file->f_mode & FMODE_READ))
-		return -EBADF;
+		goto out;
+	ret = -EIO;
+	if (!file_hotplug_read_trylock(file))
+		goto out;
+	ret = -EINVAL;
 	if (!file->f_op || (!file->f_op->read && !file->f_op->aio_read))
-		return -EINVAL;
+		goto out_unlock;
+	ret = -EFAULT;
 	if (unlikely(!access_ok(VERIFY_WRITE, buf, count)))
-		return -EFAULT;
+		goto out_unlock;
 
 	ret = rw_verify_area(READ, file, pos, count);
 	if (ret >= 0) {
@@ -309,6 +315,9 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
 		inc_syscr(current);
 	}
 
+out_unlock:
+	file_hotplug_read_unlock(file);
+out:
 	return ret;
 }
 
@@ -343,12 +352,18 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
 {
 	ssize_t ret;
 
+	ret = -EBADF;
 	if (!(file->f_mode & FMODE_WRITE))
-		return -EBADF;
+		goto out;
+	ret = -EIO;
+	if (!file_hotplug_read_trylock(file))
+		goto out;
+	ret = -EINVAL;
 	if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write))
-		return -EINVAL;
+		goto out_unlock;
+	ret = -EFAULT;
 	if (unlikely(!access_ok(VERIFY_READ, buf, count)))
-		return -EFAULT;
+		goto out_unlock;
 
 	ret = rw_verify_area(WRITE, file, pos, count);
 	if (ret >= 0) {
@@ -364,6 +379,9 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
 		inc_syscw(current);
 	}
 
+out_unlock:
+	file_hotplug_read_unlock(file);
+out:
 	return ret;
 }
 
@@ -676,12 +694,26 @@ out:
 ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
 		  unsigned long vlen, loff_t *pos)
 {
+	ssize_t ret;
+
+	ret = -EBADF;
 	if (!(file->f_mode & FMODE_READ))
-		return -EBADF;
+		goto out;
+
+	ret = -EIO;
+	if (!file_hotplug_read_trylock(file))
+		goto out;
+
+	ret = -EINVAL;
 	if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
-		return -EINVAL;
+		goto out_unlock;
+
+	ret = do_readv_writev(READ, file, vec, vlen, pos);
 
-	return do_readv_writev(READ, file, vec, vlen, pos);
+out_unlock:
+	file_hotplug_read_unlock(file);
+out:
+	return ret;
 }
 
 EXPORT_SYMBOL(vfs_readv);
@@ -689,12 +721,26 @@ EXPORT_SYMBOL(vfs_readv);
 ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
 		   unsigned long vlen, loff_t *pos)
 {
+	ssize_t ret;
+
+	ret = -EBADF;
 	if (!(file->f_mode & FMODE_WRITE))
-		return -EBADF;
+		goto out;
+
+	ret = -EIO;
+	if (!file_hotplug_read_trylock(file))
+		goto out;
+
+	ret = -EINVAL;
 	if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
-		return -EINVAL;
+		goto out_unlock;
 
-	return do_readv_writev(WRITE, file, vec, vlen, pos);
+	ret = do_readv_writev(WRITE, file, vec, vlen, pos);
+
+out_unlock:
+	file_hotplug_read_unlock(file);
+out:
+	return ret;
 }
 
 EXPORT_SYMBOL(vfs_writev);
-- 
1.6.3.1.54.g99dd.dirty

  parent reply index

Thread overview: 99+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-04-11 12:01 [RFC][PATCH 0/9] File descriptor hot-unplug support Eric W. Biederman
2009-04-11 12:03 ` [RFC][PATCH 1/9] mm: Introduce remap_file_mappings Eric W. Biederman
2009-04-11 12:05 ` [RFC][PATCH 2/9] mm: Implement generic support for revoking a mapping Eric W. Biederman
2009-04-11 12:06 ` [RFC][PATCH 3/9] sysfs: Use remap_file_mappings Eric W. Biederman
2009-04-11 12:07 ` [RFC][PATCH 4/9] vfs: Generalize the file_list Eric W. Biederman
2009-04-11 12:08 ` [RFC][PATCH 5/9] vfs: Introduce basic infrastructure for revoking a file Eric W. Biederman
2009-04-14 22:12   ` Jonathan Corbet
2009-04-15  2:55     ` Eric W. Biederman
2009-04-11 12:10 ` [RFC][PATCH 6/9] vfs: Utilize fops_read_lock where appropriate Eric W. Biederman
2009-04-11 12:11 ` [RFC][PATCH 7/9] vfs: Optimize fops_read_lock Eric W. Biederman
2009-04-11 12:13 ` [RFC][PATCH 8/9] vfs: Implement generic revoked file operations Eric W. Biederman
2009-04-12 18:56   ` Jamie Lokier
2009-04-12 20:04     ` Eric W. Biederman
2009-04-12 20:31       ` Jamie Lokier
2009-04-12 21:53         ` Eric W. Biederman
2009-04-12 20:54       ` Eric W. Biederman
2009-04-12 21:02         ` Jamie Lokier
2009-04-12 23:06           ` Eric W. Biederman
2009-04-11 12:14 ` [RFC][PATCH 9/9] proc: Use the generic vfs revoke facility that now exists Eric W. Biederman
2009-04-11 15:58 ` [RFC][PATCH 0/9] File descriptor hot-unplug support Al Viro
2009-04-11 16:49   ` Eric W. Biederman
2009-04-11 16:56     ` Al Viro
2009-04-11 23:57       ` Eric W. Biederman
2009-04-12 20:21       ` Eric W. Biederman
2009-04-14  3:16 ` Tejun Heo
2009-04-14  7:39   ` Eric W. Biederman
2009-04-14  7:45     ` Tejun Heo
2009-04-14  8:27       ` Eric W. Biederman
2009-04-14  8:49         ` Tejun Heo
2009-04-14 15:07         ` Jamie Lokier
2009-04-14 19:09           ` Eric W. Biederman
2009-06-01 21:45 ` [PATCH 0/23] File descriptor hot-unplug support v2 Eric W. Biederman
2009-06-01 21:50   ` [PATCH 01/23] mm: Introduce revoke_file_mappings Eric W. Biederman
2009-06-01 22:25     ` Andrew Morton
2009-06-02  0:12       ` Eric W. Biederman
2009-06-01 21:50   ` [PATCH 02/23] vfs: Implement unpoll_file Eric W. Biederman
2009-06-06  8:08     ` Al Viro
2009-06-01 21:50   ` [PATCH 03/23] vfs: Generalize the file_list Eric W. Biederman
2009-06-02  7:06     ` Nick Piggin
2009-06-05 19:33       ` Eric W. Biederman
2009-06-09 10:38         ` Nick Piggin
2009-06-09 18:38           ` Eric W. Biederman
2009-06-10  6:05             ` Nick Piggin
2009-06-01 21:50   ` [PATCH 04/23] vfs: Introduce infrastructure for revoking a file Eric W. Biederman
2009-06-02  5:16     ` Pekka Enberg
2009-06-02  6:51       ` Eric W. Biederman
2009-06-02  7:08         ` Pekka Enberg
2009-06-02  7:14     ` Nick Piggin
2009-06-02 17:06       ` Linus Torvalds
2009-06-02 20:52         ` Eric W. Biederman
2009-06-03  6:37           ` Nick Piggin
2009-06-02 22:56       ` Eric W. Biederman
2009-06-03  6:38         ` Nick Piggin
2009-06-05  9:03     ` Miklos Szeredi
2009-06-05 19:06       ` Eric W. Biederman
2009-06-01 21:50   ` [PATCH 05/23] vfs: Teach lseek to use file_hotplug_lock Eric W. Biederman
2009-06-01 21:50   ` Eric W. Biederman [this message]
2009-06-01 21:50   ` [PATCH 07/23] vfs: Teach sendfile,splice,tee,and vmsplice " Eric W. Biederman
2009-06-03 23:39     ` Badari Pulavarty
2009-06-05 19:37       ` Eric W. Biederman
2009-06-01 21:50   ` [PATCH 08/23] vfs: Teach readdir " Eric W. Biederman
2009-06-01 21:50   ` [PATCH 09/23] vfs: Teach poll and select " Eric W. Biederman
2009-06-01 21:50   ` [PATCH 10/23] vfs: Teach do_path_lookup " Eric W. Biederman
2009-06-01 21:50   ` [PATCH 11/23] mm: Teach mmap " Eric W. Biederman
2009-06-01 21:50   ` [PATCH 12/23] vfs: Teach fcntl " Eric W. Biederman
2009-06-01 21:50   ` [PATCH 13/23] vfs: Teach ioctl " Eric W. Biederman
2009-06-01 21:50   ` [PATCH 14/23] vfs: Teach flock " Eric W. Biederman
2009-06-01 21:50   ` [PATCH 15/23] vfs: Teach fallocate, and filp_close " Eric W. Biederman
2009-06-01 21:50   ` [PATCH 16/23] vfs: Teach fstatfs, fstatfs64, ftruncate, fchdir, fchmod, fchown " Eric W. Biederman
2009-06-01 21:50   ` [PATCH 17/23] proc: Teach /proc/<pid>/fd " Eric W. Biederman
2009-06-01 21:50   ` [PATCH 18/23] vfs: Teach epoll " Eric W. Biederman
2009-06-02 16:51     ` Davide Libenzi
2009-06-02 21:23       ` Eric W. Biederman
2009-06-02 21:52         ` Davide Libenzi
2009-06-02 22:51           ` Eric W. Biederman
2009-06-03 14:57             ` Davide Libenzi
2009-06-03 20:53               ` Eric W. Biederman
2009-06-04  0:50                 ` Davide Libenzi
2009-06-04  1:42                   ` Eric W. Biederman
2009-06-01 21:50   ` [PATCH 19/23] eventpoll: Fix comment Eric W. Biederman
2009-06-01 21:50   ` [PATCH 20/23] vfs: Teach aio to use file_hotplug_lock Eric W. Biederman
2009-06-01 21:50   ` [PATCH 21/23] vfs: Teach fsync " Eric W. Biederman
2009-06-01 21:50   ` [PATCH 22/23] vfs: Teach fadvice to file_hotplug_lock Eric W. Biederman
2009-06-01 21:50   ` [PATCH 23/23] vfs: Teach readahead to use the file_hotplug_lock Eric W. Biederman
2009-06-03 23:25     ` Badari Pulavarty
2009-06-06  8:03   ` [PATCH 0/23] File descriptor hot-unplug support v2 Al Viro
2009-06-08  9:41     ` Miklos Szeredi
2009-06-08 10:24       ` Jamie Lokier
2009-06-08 16:29       ` Al Viro
2009-06-08 16:44         ` Miklos Szeredi
2009-06-08 17:50           ` Al Viro
2009-06-08 18:01             ` Linus Torvalds
2009-06-08 18:50               ` Al Viro
2009-06-08 19:18                 ` Linus Torvalds
2009-06-09  6:42                   ` Eric W. Biederman
2009-06-09 10:52                     ` Nick Piggin
2009-06-09  5:50             ` Miklos Szeredi
2009-06-09  6:31               ` Eric W. Biederman
2009-06-09  6:22     ` Eric W. Biederman

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