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Btrfs: Optimise NFS readdir hack slightly; don't call readdir() again when done

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Date: Sun, 17 Aug 2008 17:12:56 +0100
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
David Woodhouse 2008-08-17 17:12:56 +01:00 committed by Chris Mason
parent 49593bfa57
commit f2322b1c65
1 changed files with 7 additions and 4 deletions
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11
fs/btrfs/inode.c
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@ -2040,6 +2040,7 @@ struct nfshack_dirent {
struct nfshack_readdir { struct nfshack_readdir {
char *dirent; char *dirent;
size_t used; size_t used;
int full;
}; };
@ -2052,8 +2053,10 @@ static int btrfs_nfshack_filldir(void *__buf, const char *name, int namlen,
unsigned int reclen; unsigned int reclen;
reclen = ALIGN(sizeof(struct nfshack_dirent) + namlen, sizeof(u64)); 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; return -EINVAL;
}
de->namlen = namlen; de->namlen = namlen;
de->offset = offset; de->offset = offset;
@ -2080,11 +2083,11 @@ static int btrfs_nfshack_readdir(struct file *file, void *dirent,
offset = file->f_pos; offset = file->f_pos;
while (1) { do {
unsigned int reclen; unsigned int reclen;
buf.used = 0; buf.used = 0;
buf.full = 0;
err = btrfs_real_readdir(file, &buf, btrfs_nfshack_filldir); err = btrfs_real_readdir(file, &buf, btrfs_nfshack_filldir);
if (err) if (err)
break; break;
@ -2108,7 +2111,7 @@ static int btrfs_nfshack_readdir(struct file *file, void *dirent,
size -= reclen; size -= reclen;
de = (struct nfshack_dirent *)((char *)de + reclen); de = (struct nfshack_dirent *)((char *)de + reclen);
} }
} } while (buf.full);
done: done:
free_page((unsigned long)buf.dirent); free_page((unsigned long)buf.dirent);