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authorDave Hansen <haveblue@us.ibm.com>2006-09-30 23:29:02 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-01 00:39:30 -0700
commitaab520e2f6c80160cabd187a8d0292d1cec8ff68 (patch)
treee066da750f4aba3e5b472a2fafd5d267876420e2
parent6902d925d568cd5bfda8a1a328bf08d26d1bab46 (diff)
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[PATCH] r/o bind mount prepwork: move open_namei()'s vfs_create()
The code around vfs_create() in open_namei() is getting a bit too complex. Right now, there is at least the reference count on the dentry, and the i_mutex to worry about. Soon, we'll also have mnt_writecount. So, break the vfs_create() call out of open_namei(), and into a helper function. This duplicates the call to may_open(), but that isn't such a bad thing since the arguments (acc_mode and flag) were being heavily massaged anyway. Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Acked-by: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--fs/namei.c30
1 files changed, 20 insertions, 10 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 7bdceedd254..28d49b301d5 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1595,6 +1595,24 @@ int may_open(struct nameidata *nd, int acc_mode, int flag)
return 0;
}
+static int open_namei_create(struct nameidata *nd, struct path *path,
+ int flag, int mode)
+{
+ int error;
+ struct dentry *dir = nd->dentry;
+
+ if (!IS_POSIXACL(dir->d_inode))
+ mode &= ~current->fs->umask;
+ error = vfs_create(dir->d_inode, path->dentry, mode, nd);
+ mutex_unlock(&dir->d_inode->i_mutex);
+ dput(nd->dentry);
+ nd->dentry = path->dentry;
+ if (error)
+ return error;
+ /* Don't check for write permission, don't truncate */
+ return may_open(nd, 0, flag & ~O_TRUNC);
+}
+
/*
* open_namei()
*
@@ -1676,18 +1694,10 @@ do_last:
/* Negative dentry, just create the file */
if (!path.dentry->d_inode) {
- if (!IS_POSIXACL(dir->d_inode))
- mode &= ~current->fs->umask;
- error = vfs_create(dir->d_inode, path.dentry, mode, nd);
- mutex_unlock(&dir->d_inode->i_mutex);
- dput(nd->dentry);
- nd->dentry = path.dentry;
+ error = open_namei_create(nd, &path, flag, mode);
if (error)
goto exit;
- /* Don't check for write permission, don't truncate */
- acc_mode = 0;
- flag &= ~O_TRUNC;
- goto ok;
+ return 0;
}
/*