X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=fs%2Fopen.c;h=3b69c53e18379801e9bad4111e689be2cdaf1952;hb=65d3a68af53523d4d6daeb896c93e326cf46fd85;hp=be6a457f4226374b9d462cd8ee4332326ea22097;hpb=1f1c2881f673671539b25686df463518d69c4649;p=linux-2.6-omap-h63xx.git

diff --git a/fs/open.c b/fs/open.c
index be6a457f422..3b69c53e183 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -26,6 +26,7 @@
 #include <linux/syscalls.h>
 #include <linux/rcupdate.h>
 #include <linux/audit.h>
+#include <linux/falloc.h>
 
 int vfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
@@ -255,24 +256,26 @@ static long do_sys_truncate(const char __user * path, loff_t length)
 	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 		goto dput_and_out;
 
-	/*
-	 * Make sure that there are no leases.
-	 */
-	error = break_lease(inode, FMODE_WRITE);
+	error = get_write_access(inode);
 	if (error)
 		goto dput_and_out;
 
-	error = get_write_access(inode);
+	/*
+	 * Make sure that there are no leases.  get_write_access() protects
+	 * against the truncate racing with a lease-granting setlease().
+	 */
+	error = break_lease(inode, FMODE_WRITE);
 	if (error)
-		goto dput_and_out;
+		goto put_write_and_out;
 
 	error = locks_verify_truncate(inode, NULL, length);
 	if (!error) {
 		DQUOT_INIT(inode);
 		error = do_truncate(nd.dentry, length, 0, NULL);
 	}
-	put_write_access(inode);
 
+put_write_and_out:
+	put_write_access(inode);
 dput_and_out:
 	path_release(&nd);
 out:
@@ -352,6 +355,64 @@ asmlinkage long sys_ftruncate64(unsigned int fd, loff_t length)
 }
 #endif
 
+asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len)
+{
+	struct file *file;
+	struct inode *inode;
+	long ret = -EINVAL;
+
+	if (offset < 0 || len <= 0)
+		goto out;
+
+	/* Return error if mode is not supported */
+	ret = -EOPNOTSUPP;
+	if (mode && !(mode & FALLOC_FL_KEEP_SIZE))
+		goto out;
+
+	ret = -EBADF;
+	file = fget(fd);
+	if (!file)
+		goto out;
+	if (!(file->f_mode & FMODE_WRITE))
+		goto out_fput;
+	/*
+	 * Revalidate the write permissions, in case security policy has
+	 * changed since the files were opened.
+	 */
+	ret = security_file_permission(file, MAY_WRITE);
+	if (ret)
+		goto out_fput;
+
+	inode = file->f_path.dentry->d_inode;
+
+	ret = -ESPIPE;
+	if (S_ISFIFO(inode->i_mode))
+		goto out_fput;
+
+	ret = -ENODEV;
+	/*
+	 * Let individual file system decide if it supports preallocation
+	 * for directories or not.
+	 */
+	if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
+		goto out_fput;
+
+	ret = -EFBIG;
+	/* Check for wrap through zero too */
+	if (((offset + len) > inode->i_sb->s_maxbytes) || ((offset + len) < 0))
+		goto out_fput;
+
+	if (inode->i_op && inode->i_op->fallocate)
+		ret = inode->i_op->fallocate(inode, mode, offset, len);
+	else
+		ret = -EOPNOTSUPP;
+
+out_fput:
+	fput(file);
+out:
+	return ret;
+}
+
 /*
  * access() needs to use the real uid/gid, not the effective uid/gid.
  * We do this by temporarily clearing all FS-related capabilities and
@@ -508,7 +569,7 @@ asmlinkage long sys_fchmod(unsigned int fd, mode_t mode)
 	dentry = file->f_path.dentry;
 	inode = dentry->d_inode;
 
-	audit_inode(NULL, inode);
+	audit_inode(NULL, dentry);
 
 	err = -EROFS;
 	if (IS_RDONLY(inode))
@@ -597,7 +658,8 @@ static int chown_common(struct dentry * dentry, uid_t user, gid_t group)
 		newattrs.ia_gid = group;
 	}
 	if (!S_ISDIR(inode->i_mode))
-		newattrs.ia_valid |= ATTR_KILL_SUID|ATTR_KILL_SGID;
+		newattrs.ia_valid |=
+			ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
 	mutex_lock(&inode->i_mutex);
 	error = notify_change(dentry, &newattrs);
 	mutex_unlock(&inode->i_mutex);
@@ -665,7 +727,7 @@ asmlinkage long sys_fchown(unsigned int fd, uid_t user, gid_t group)
 		goto out;
 
 	dentry = file->f_path.dentry;
-	audit_inode(NULL, dentry->d_inode);
+	audit_inode(NULL, dentry);
 	error = chown_common(dentry, user, group);
 	fput(file);
 out:
@@ -696,6 +758,10 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
 	f->f_op = fops_get(inode->i_fop);
 	file_move(f, &inode->i_sb->s_files);
 
+	error = security_dentry_open(f);
+	if (error)
+		goto cleanup_all;
+
 	if (!open && f->f_op)
 		open = f->f_op->open;
 	if (open) {
@@ -1112,7 +1178,7 @@ asmlinkage long sys_vhangup(void)
 int generic_file_open(struct inode * inode, struct file * filp)
 {
 	if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
-		return -EFBIG;
+		return -EOVERFLOW;
 	return 0;
 }