exportfs: Return the minimum required handle size
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>
diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c
index ff27d7a..b4ffad8 100644
--- a/fs/btrfs/export.c
+++ b/fs/btrfs/export.c
@@ -21,9 +21,13 @@
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;
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 4b68257..cfe5573 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -320,9 +320,14 @@
struct inode * inode = dentry->d_inode;
int len = *max_len;
int type = FILEID_INO32_GEN;
-
- if (len < 2 || (connectable && len < 4))
+
+ if (connectable && (len < 4)) {
+ *max_len = 4;
return 255;
+ } else if (len < 2) {
+ *max_len = 2;
+ return 255;
+ }
len = 2;
fid->i32.ino = inode->i_ino;
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 86753fe..0e277ec 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -757,8 +757,10 @@
struct inode *inode = de->d_inode;
u32 ipos_h, ipos_m, ipos_l;
- if (len < 5)
+ if (len < 5) {
+ *lenp = 5;
return 255; /* no room */
+ }
ipos_h = MSDOS_I(inode)->i_pos >> 8;
ipos_m = (MSDOS_I(inode)->i_pos & 0xf0) << 24;
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 9e3f68c..051b1a0 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -637,8 +637,10 @@
u64 nodeid;
u32 generation;
- if (*max_len < len)
+ if (*max_len < len) {
+ *max_len = len;
return 255;
+ }
nodeid = get_fuse_inode(inode)->nodeid;
generation = inode->i_generation;
diff --git a/fs/gfs2/export.c b/fs/gfs2/export.c
index 9023db8..b5a5e60 100644
--- a/fs/gfs2/export.c
+++ b/fs/gfs2/export.c
@@ -36,9 +36,13 @@
struct super_block *sb = inode->i_sb;
struct gfs2_inode *ip = GFS2_I(inode);
- if (*len < GFS2_SMALL_FH_SIZE ||
- (connectable && *len < GFS2_LARGE_FH_SIZE))
+ if (connectable && (*len < GFS2_LARGE_FH_SIZE)) {
+ *len = GFS2_LARGE_FH_SIZE;
return 255;
+ } else if (*len < GFS2_SMALL_FH_SIZE) {
+ *len = GFS2_SMALL_FH_SIZE;
+ return 255;
+ }
fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
diff --git a/fs/isofs/export.c b/fs/isofs/export.c
index ed752cb..dd4687f 100644
--- a/fs/isofs/export.c
+++ b/fs/isofs/export.c
@@ -124,9 +124,13 @@
* offset of the inode and the upper 16 bits of fh32[1] to
* hold the offset of the parent.
*/
-
- if (len < 3 || (connectable && len < 5))
+ if (connectable && (len < 5)) {
+ *max_len = 5;
return 255;
+ } else if (len < 3) {
+ *max_len = 3;
+ return 255;
+ }
len = 3;
fh32[0] = ei->i_iget5_block;
diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c
index 5dbc306..254652a 100644
--- a/fs/ocfs2/export.c
+++ b/fs/ocfs2/export.c
@@ -197,8 +197,12 @@
dentry->d_name.len, dentry->d_name.name,
fh, len, connectable);
- if (len < 3 || (connectable && len < 6)) {
- mlog(ML_ERROR, "fh buffer is too small for encoding\n");
+ if (connectable && (len < 6)) {
+ *max_len = 6;
+ type = 255;
+ goto bail;
+ } else if (len < 3) {
+ *max_len = 3;
type = 255;
goto bail;
}
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 0bae036..1bba24b 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -1593,8 +1593,13 @@
struct inode *inode = dentry->d_inode;
int maxlen = *lenp;
- if (maxlen < 3)
+ if (need_parent && (maxlen < 5)) {
+ *lenp = 5;
return 255;
+ } else if (maxlen < 3) {
+ *lenp = 3;
+ return 255;
+ }
data[0] = inode->i_ino;
data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index b7c338d..f1dce84 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -1286,8 +1286,13 @@
struct fid *fid = (struct fid *)fh;
int type = FILEID_UDF_WITHOUT_PARENT;
- if (len < 3 || (connectable && len < 5))
+ if (connectable && (len < 5)) {
+ *lenp = 5;
return 255;
+ } else if (len < 3) {
+ *lenp = 3;
+ return 255;
+ }
*lenp = 3;
fid->udf.block = location.logicalBlockNum;
diff --git a/fs/xfs/linux-2.6/xfs_export.c b/fs/xfs/linux-2.6/xfs_export.c
index fc0114d..f4f878f 100644
--- a/fs/xfs/linux-2.6/xfs_export.c
+++ b/fs/xfs/linux-2.6/xfs_export.c
@@ -89,8 +89,10 @@
* seven combinations work. The real answer is "don't use v2".
*/
len = xfs_fileid_length(fileid_type);
- if (*max_len < len)
+ if (*max_len < len) {
+ *max_len = len;
return 255;
+ }
*max_len = len;
switch (fileid_type) {