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xfs: fold xfs_attr_get_int into xfs_attr_get

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This allows doing an unlocked check if an attr for is present at all and
slightly reduce the lock hold time if we actually do an attr get.

Plus various minor style fixes to the new xfs_attr_get.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig 2014-05-13 16:34:24 +10:00 committed by Dave Chinner
parent c5b4ac39a4
commit b87d022c27
1 changed files with 30 additions and 55 deletions
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85
fs/xfs/xfs_attr.c
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@ -106,26 +106,34 @@ xfs_inode_hasattr(
* Overall external interface routines.
*========================================================================*/
STATIC int
xfs_attr_get_int(
int
xfs_attr_get(
struct xfs_inode *ip,
struct xfs_name *name,
const unsigned char *name,
unsigned char *value,
int *valuelenp,
int flags)
{
xfs_da_args_t args;
int error;
struct xfs_da_args args;
struct xfs_name xname;
uint lock_mode;
int error;
XFS_STATS_INC(xs_attr_get);
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return EIO;
if (!xfs_inode_hasattr(ip))
return ENOATTR;
/*
* Fill in the arg structure for this request.
*/
memset((char *)&args, 0, sizeof(args));
args.name = name->name;
args.namelen = name->len;
error = xfs_attr_name_to_xname(&xname, name);
if (error)
return error;
memset(&args, 0, sizeof(args));
args.name = xname.name;
args.namelen = xname.len;
args.value = value;
args.valuelen = *valuelenp;
args.flags = flags;
@ -133,52 +141,19 @@ xfs_attr_get_int(
args.dp = ip;
args.whichfork = XFS_ATTR_FORK;
/*
* Decide on what work routines to call based on the inode size.
*/
if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
error = xfs_attr_shortform_getvalue(&args);
} else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
error = xfs_attr_leaf_get(&args);
} else {
error = xfs_attr_node_get(&args);
}
/*
* Return the number of bytes in the value to the caller.
*/
*valuelenp = args.valuelen;
if (error == EEXIST)
error = 0;
return(error);
}
int
xfs_attr_get(
xfs_inode_t *ip,
const unsigned char *name,
unsigned char *value,
int *valuelenp,
int flags)
{
int error;
struct xfs_name xname;
uint lock_mode;
XFS_STATS_INC(xs_attr_get);
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return(EIO);
error = xfs_attr_name_to_xname(&xname, name);
if (error)
return error;
lock_mode = xfs_ilock_attr_map_shared(ip);
error = xfs_attr_get_int(ip, &xname, value, valuelenp, flags);
if (!xfs_inode_hasattr(ip))
error = ENOATTR;
else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)
error = xfs_attr_shortform_getvalue(&args);
else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK))
error = xfs_attr_leaf_get(&args);
else
error = xfs_attr_node_get(&args);
xfs_iunlock(ip, lock_mode);
return(error);
*valuelenp = args.valuelen;
return error == EEXIST ? 0 : error;
}
/*