NFSv4: Don't fail nfs4_xdr_dec_open if decode_restorefh() failed

[pandora-kernel.git] / fs / open.c

diff --git a/fs/open.c b/fs/open.c
index be6a457..a6b054e 100644 (file)
--- 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)
 {
@@ -352,6 +353,64 @@ 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 = -ENOSYS;
+
+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