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exportfs: Return the minimum required handle size

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The exportfs encode handle function should return the minimum required
handle size. This helps user to find out the handle size by passing 0
handle size in the first step and then redoing to the call again with
the returned handle size value.

Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Aneesh Kumar K.V
2011-01-29 18:43:25 +05:30
committed by Al Viro
parent c8b91accfa
commit 5fe0c23788
12 changed files with 59 additions and 18 deletions
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8
fs/btrfs/export.c
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@@ -21,9 +21,13 @@ static int btrfs_encode_fh(struct dentry *dentry, u32 *fh, int *max_len,
int len = *max_len;
int type;
if ((len < BTRFS_FID_SIZE_NON_CONNECTABLE) ||
(connectable && len < BTRFS_FID_SIZE_CONNECTABLE))
if (connectable && (len < BTRFS_FID_SIZE_CONNECTABLE)) {
*max_len = BTRFS_FID_SIZE_CONNECTABLE;
return 255;
} else if (len < BTRFS_FID_SIZE_NON_CONNECTABLE) {
*max_len = BTRFS_FID_SIZE_NON_CONNECTABLE;
return 255;
}
len = BTRFS_FID_SIZE_NON_CONNECTABLE;
type = FILEID_BTRFS_WITHOUT_PARENT;