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Message-Id: <20071109210440.497630FB@kernel>
Date: Fri, 09 Nov 2007 13:04:40 -0800
From: Dave Hansen <haveblue@...ibm.com>
To: ezk@...sunysb.edu
Cc: akpm@...l.org, linux-kernel@...r.kernel.org, hch@...radead.org,
Dave Hansen <haveblue@...ibm.com>
Subject: [PATCH 2/2] fix up new filp allocators
Some new uses of get_empty_filp() have crept in, and are
not properly taking mnt_want_write()s. This fixes them
up.
We really need to kill get_empty_filp().
Signed-off-by: Dave Hansen <haveblue@...ibm.com>
---
linux-2.6.git-dave/fs/anon_inodes.c | 16 ++++++----------
linux-2.6.git-dave/fs/file_table.c | 6 ++++++
linux-2.6.git-dave/fs/nfsd/nfs4state.c | 3 ++-
linux-2.6.git-dave/fs/pipe.c | 17 +++++++----------
4 files changed, 21 insertions(+), 21 deletions(-)
diff -puN fs/anon_inodes.c~fix-idmapd-bug fs/anon_inodes.c
--- linux-2.6.git/fs/anon_inodes.c~fix-idmapd-bug 2007-11-09 12:13:15.000000000 -0800
+++ linux-2.6.git-dave/fs/anon_inodes.c 2007-11-09 12:13:15.000000000 -0800
@@ -81,13 +81,10 @@ int anon_inode_getfd(int *pfd, struct in
if (IS_ERR(anon_inode_inode))
return -ENODEV;
- file = get_empty_filp();
- if (!file)
- return -ENFILE;
error = get_unused_fd();
if (error < 0)
- goto err_put_filp;
+ return error;
fd = error;
/*
@@ -114,14 +111,15 @@ int anon_inode_getfd(int *pfd, struct in
dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(dentry, anon_inode_inode);
- file->f_path.mnt = mntget(anon_inode_mnt);
- file->f_path.dentry = dentry;
+ error = -ENFILE;
+ file = alloc_file(anon_inode_mnt, dentry,
+ FMODE_READ | FMODE_WRITE, fops);
+ if (!file)
+ goto err_put_unused_fd;
file->f_mapping = anon_inode_inode->i_mapping;
file->f_pos = 0;
file->f_flags = O_RDWR;
- file->f_op = fops;
- file->f_mode = FMODE_READ | FMODE_WRITE;
file->f_version = 0;
file->private_data = priv;
@@ -134,8 +132,6 @@ int anon_inode_getfd(int *pfd, struct in
err_put_unused_fd:
put_unused_fd(fd);
-err_put_filp:
- put_filp(file);
return error;
}
EXPORT_SYMBOL_GPL(anon_inode_getfd);
diff -puN fs/file_table.c~fix-idmapd-bug fs/file_table.c
--- linux-2.6.git/fs/file_table.c~fix-idmapd-bug 2007-11-09 12:13:15.000000000 -0800
+++ linux-2.6.git-dave/fs/file_table.c 2007-11-09 12:13:15.000000000 -0800
@@ -89,6 +89,12 @@ int proc_nr_files(ctl_table *table, int
/* Find an unused file structure and return a pointer to it.
* Returns NULL, if there are no more free file structures or
* we run out of memory.
+ *
+ * Be very careful using this. You are responsible for
+ * getting write access to any mount that you might assign
+ * to this filp, if it is opened for write. If this is not
+ * done, you will imbalance int the mount's writer count
+ * and a warning at __fput() time.
*/
struct file *get_empty_filp(void)
{
diff -puN fs/nfsd/nfs4state.c~fix-idmapd-bug fs/nfsd/nfs4state.c
--- linux-2.6.git/fs/nfsd/nfs4state.c~fix-idmapd-bug 2007-11-09 12:13:15.000000000 -0800
+++ linux-2.6.git-dave/fs/nfsd/nfs4state.c 2007-11-09 12:13:15.000000000 -0800
@@ -41,6 +41,7 @@
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
+#include <linux/file.h>
#include <linux/mount.h>
#include <linux/workqueue.h>
#include <linux/smp_lock.h>
@@ -1303,7 +1304,7 @@ static inline void
nfs4_file_downgrade(struct file *filp, unsigned int share_access)
{
if (share_access & NFS4_SHARE_ACCESS_WRITE) {
- put_write_access(filp->f_path.dentry->d_inode);
+ drop_file_write_access(filp);
filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
}
}
diff -puN fs/pipe.c~fix-idmapd-bug fs/pipe.c
--- linux-2.6.git/fs/pipe.c~fix-idmapd-bug 2007-11-09 12:13:15.000000000 -0800
+++ linux-2.6.git-dave/fs/pipe.c 2007-11-09 12:13:15.000000000 -0800
@@ -959,13 +959,10 @@ struct file *create_write_pipe(void)
struct dentry *dentry;
struct qstr name = { .name = "" };
- f = get_empty_filp();
- if (!f)
- return ERR_PTR(-ENFILE);
err = -ENFILE;
inode = get_pipe_inode();
if (!inode)
- goto err_file;
+ goto err;
err = -ENOMEM;
dentry = d_alloc(pipe_mnt->mnt_sb->s_root, &name);
@@ -980,13 +977,14 @@ struct file *create_write_pipe(void)
*/
dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(dentry, inode);
- f->f_path.mnt = mntget(pipe_mnt);
- f->f_path.dentry = dentry;
+
+ f = alloc_file(pipe_mnt, dentry, FMODE_WRITE, &write_pipe_fops);
+ err = -ENFILE;
+ if (!f)
+ goto err_inode;
f->f_mapping = inode->i_mapping;
f->f_flags = O_WRONLY;
- f->f_op = &write_pipe_fops;
- f->f_mode = FMODE_WRITE;
f->f_version = 0;
return f;
@@ -994,8 +992,7 @@ struct file *create_write_pipe(void)
err_inode:
free_pipe_info(inode);
iput(inode);
- err_file:
- put_filp(f);
+ err:
return ERR_PTR(err);
}
_
-
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