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Commit f2322b1c authored by David Woodhouse's avatar David Woodhouse Committed by Chris Mason
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Btrfs: Optimise NFS readdir hack slightly; don't call readdir() again when done 



Date: Sun, 17 Aug 2008 17:12:56 +0100
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 49593bfa

fs/btrfs/inode.c

+7 −4
Original line number Diff line number Diff line
@@ -2040,6 +2040,7 @@ struct nfshack_dirent { 
struct nfshack_readdir {

	char		*dirent;

	size_t		used;

	int		full;

};
@@ -2052,8 +2053,10 @@ static int btrfs_nfshack_filldir(void *__buf, const char *name, int namlen, 
	unsigned int reclen;



	reclen = ALIGN(sizeof(struct nfshack_dirent) + namlen, sizeof(u64));

	if (buf->used + reclen > PAGE_SIZE)

	if (buf->used + reclen > PAGE_SIZE) {

		buf->full = 1;

		return -EINVAL;

	}



	de->namlen = namlen;

	de->offset = offset;
@@ -2080,11 +2083,11 @@ static int btrfs_nfshack_readdir(struct file *file, void *dirent, 


	offset = file->f_pos;



	while (1) {

	do {

		unsigned int reclen;



		buf.used = 0;



		buf.full = 0;

		err = btrfs_real_readdir(file, &buf, btrfs_nfshack_filldir);

		if (err)

			break;
@@ -2108,7 +2111,7 @@ static int btrfs_nfshack_readdir(struct file *file, void *dirent, 
			size -= reclen;

			de = (struct nfshack_dirent *)((char *)de + reclen);

		}

	}

	} while (buf.full);



 done:

	free_page((unsigned long)buf.dirent);