Commit 07120f1a authored by Allison Collins's avatar Allison Collins Committed by Darrick J. Wong
Browse files

xfs: Add xfs_has_attr and subroutines 



This patch adds a new functions to check for the existence of an
attribute. Subroutines are also added to handle the cases of leaf
blocks, nodes or shortform. Common code that appears in existing attr
add and remove functions have been factored out to help reduce the
appearance of duplicated code.  We will need these routines later for
delayed attributes since delayed operations cannot return error codes.

Signed-off-by: default avatarAllison Collins <allison.henderson@oracle.com>
Reviewed-by: default avatarChandan Rajendra <chandanrlinux@gmail.com>
Reviewed-by: default avatarBrian Foster <bfoster@redhat.com>
Reviewed-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
[darrick: fix a leak-on-error bug reported by Dan Carpenter]
[darrick: fix unused variable warning reported by 0day]
Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Acked-by: default avatarDave Chinner <dchinner@redhat.com>
Reported-by: default avatar <dan.carpenter@oracle.com>
Reported-by: default avatarkernel test robot <lkp@intel.com>
parent 4491a3dd

fs/xfs/libxfs/xfs_attr.c

+123 −61
Original line number Diff line number Diff line
@@ -46,6 +46,7 @@ STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args); 
STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);

STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);

STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);

STATIC int xfs_attr_leaf_hasname(struct xfs_da_args *args, struct xfs_buf **bp);



/*

 * Internal routines when attribute list is more than one block.
@@ -53,6 +54,8 @@ STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args); 
STATIC int xfs_attr_node_get(xfs_da_args_t *args);

STATIC int xfs_attr_node_addname(xfs_da_args_t *args);

STATIC int xfs_attr_node_removename(xfs_da_args_t *args);

STATIC int xfs_attr_node_hasname(xfs_da_args_t *args,

				 struct xfs_da_state **state);

STATIC int xfs_attr_fillstate(xfs_da_state_t *state);

STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
@@ -260,6 +263,37 @@ xfs_attr_set_args( 
	return error;

}



/*

 * Return EEXIST if attr is found, or ENOATTR if not

 */

int

xfs_has_attr(

	struct xfs_da_args	*args)

{

	struct xfs_inode	*dp = args->dp;

	struct xfs_buf		*bp = NULL;

	int			error;



	if (!xfs_inode_hasattr(dp))

		return -ENOATTR;



	if (dp->i_afp->if_format == XFS_DINODE_FMT_LOCAL) {

		ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);

		return xfs_attr_sf_findname(args, NULL, NULL);

	}



	if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {

		error = xfs_attr_leaf_hasname(args, &bp);



		if (bp)

			xfs_trans_brelse(args->trans, bp);



		return error;

	}



	return xfs_attr_node_hasname(args, NULL);

}



/*

 * Remove the attribute specified in @args.

 */
@@ -469,26 +503,19 @@ STATIC int 
xfs_attr_leaf_addname(

	struct xfs_da_args	*args)

{

	struct xfs_inode	*dp;

	struct xfs_buf		*bp;

	int			retval, error, forkoff;

	struct xfs_inode	*dp = args->dp;



	trace_xfs_attr_leaf_addname(args);



	/*

	 * Read the (only) block in the attribute list in.

	 */

	dp = args->dp;

	args->blkno = 0;

	error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, &bp);

	if (error)

		return error;



	/*

	 * Look up the given attribute in the leaf block.  Figure out if

	 * the given flags produce an error or call for an atomic rename.

	 */

	retval = xfs_attr3_leaf_lookup_int(bp, args);

	retval = xfs_attr_leaf_hasname(args, &bp);

	if (retval != -ENOATTR && retval != -EEXIST)

		return retval;

	if (retval == -ENOATTR && (args->attr_flags & XATTR_REPLACE))

		goto out_brelse;

	if (retval == -EEXIST) {
@@ -639,6 +666,27 @@ xfs_attr_leaf_addname( 
	return retval;

}



/*

 * Return EEXIST if attr is found, or ENOATTR if not

 */

STATIC int

xfs_attr_leaf_hasname(

	struct xfs_da_args	*args,

	struct xfs_buf		**bp)

{

	int                     error = 0;



	error = xfs_attr3_leaf_read(args->trans, args->dp, 0, bp);

	if (error)

		return error;



	error = xfs_attr3_leaf_lookup_int(*bp, args);

	if (error != -ENOATTR && error != -EEXIST)

		xfs_trans_brelse(args->trans, *bp);



	return error;

}



/*

 * Remove a name from the leaf attribute list structure

 *
@@ -659,16 +707,14 @@ xfs_attr_leaf_removename( 
	 * Remove the attribute.

	 */

	dp = args->dp;

	args->blkno = 0;

	error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, &bp);

	if (error)

		return error;



	error = xfs_attr3_leaf_lookup_int(bp, args);

	error = xfs_attr_leaf_hasname(args, &bp);



	if (error == -ENOATTR) {

		xfs_trans_brelse(args->trans, bp);

		return error;

	}

	} else if (error != -EEXIST)

		return error;



	xfs_attr3_leaf_remove(bp, args);
@@ -703,21 +749,53 @@ xfs_attr_leaf_get(xfs_da_args_t *args) 


	trace_xfs_attr_leaf_get(args);



	args->blkno = 0;

	error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, &bp);

	if (error)

		return error;

	error = xfs_attr_leaf_hasname(args, &bp);



	error = xfs_attr3_leaf_lookup_int(bp, args);

	if (error != -EEXIST)  {

	if (error == -ENOATTR)  {

		xfs_trans_brelse(args->trans, bp);

		return error;

	}

	} else if (error != -EEXIST)

		return error;





	error = xfs_attr3_leaf_getvalue(bp, args);

	xfs_trans_brelse(args->trans, bp);

	return error;

}



/*

 * Return EEXIST if attr is found, or ENOATTR if not

 * statep: If not null is set to point at the found state.  Caller will

 *         be responsible for freeing the state in this case.

 */

STATIC int

xfs_attr_node_hasname(

	struct xfs_da_args	*args,

	struct xfs_da_state	**statep)

{

	struct xfs_da_state	*state;

	int			retval, error;



	state = xfs_da_state_alloc(args);

	if (statep != NULL)

		*statep = NULL;



	/*

	 * Search to see if name exists, and get back a pointer to it.

	 */

	error = xfs_da3_node_lookup_int(state, &retval);

	if (error) {

		xfs_da_state_free(state);

		return error;

	}



	if (statep != NULL)

		*statep = state;

	else

		xfs_da_state_free(state);

	return retval;

}



/*========================================================================

 * External routines when attribute list size > geo->blksize

 *========================================================================*/
@@ -748,15 +826,14 @@ xfs_attr_node_addname( 
	 */

	dp = args->dp;

restart:

	state = xfs_da_state_alloc(args);



	/*

	 * Search to see if name already exists, and get back a pointer

	 * to where it should go.

	 */

	error = xfs_da3_node_lookup_int(state, &retval);

	if (error)

	retval = xfs_attr_node_hasname(args, &state);

	if (retval != -ENOATTR && retval != -EEXIST)

		goto out;



	blk = &state->path.blk[ state->path.active-1 ];

	ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);

	if (retval == -ENOATTR && (args->attr_flags & XATTR_REPLACE))
@@ -960,27 +1037,15 @@ xfs_attr_node_removename( 
{

	struct xfs_da_state	*state;

	struct xfs_da_state_blk	*blk;

	struct xfs_inode	*dp;

	struct xfs_buf		*bp;

	int			retval, error, forkoff;

	struct xfs_inode	*dp = args->dp;



	trace_xfs_attr_node_removename(args);



	/*

	 * Tie a string around our finger to remind us where we are.

	 */

	dp = args->dp;

	state = xfs_da_state_alloc(args);



	/*

	 * Search to see if name exists, and get back a pointer to it.

	 */

	error = xfs_da3_node_lookup_int(state, &retval);

	if (error || (retval != -EEXIST)) {

		if (error == 0)

			error = retval;

	error = xfs_attr_node_hasname(args, &state);

	if (error != -EEXIST)

		goto out;

	}



	/*

	 * If there is an out-of-line value, de-allocate the blocks.
@@ -1075,6 +1140,7 @@ xfs_attr_node_removename( 
	error = 0;



out:

	if (state)

		xfs_da_state_free(state);

	return error;

}
@@ -1191,45 +1257,41 @@ xfs_attr_refillstate(xfs_da_state_t *state) 
 * Returns 0 on successful retrieval, otherwise an error.

 */

STATIC int

xfs_attr_node_get(xfs_da_args_t *args)

xfs_attr_node_get(

	struct xfs_da_args	*args)

{

	xfs_da_state_t *state;

	xfs_da_state_blk_t *blk;

	int error, retval;

	struct xfs_da_state	*state;

	struct xfs_da_state_blk	*blk;

	int			i;

	int			error;



	trace_xfs_attr_node_get(args);



	state = xfs_da_state_alloc(args);



	/*

	 * Search to see if name exists, and get back a pointer to it.

	 */

	error = xfs_da3_node_lookup_int(state, &retval);

	if (error) {

		retval = error;

		goto out_release;

	}

	if (retval != -EEXIST)

	error = xfs_attr_node_hasname(args, &state);

	if (error != -EEXIST)

		goto out_release;



	/*

	 * Get the value, local or "remote"

	 */

	blk = &state->path.blk[state->path.active - 1];

	retval = xfs_attr3_leaf_getvalue(blk->bp, args);

	error = xfs_attr3_leaf_getvalue(blk->bp, args);



	/*

	 * If not in a transaction, we have to release all the buffers.

	 */

out_release:

	for (i = 0; i < state->path.active; i++) {

	for (i = 0; state != NULL && i < state->path.active; i++) {

		xfs_trans_brelse(args->trans, state->path.blk[i].bp);

		state->path.blk[i].bp = NULL;

	}



	if (state)

		xfs_da_state_free(state);

	return retval;

	return error;

}



/* Returns true if the attribute entry name is valid. */

fs/xfs/libxfs/xfs_attr.h

+1 −0
Original line number Diff line number Diff line
@@ -89,6 +89,7 @@ int xfs_attr_get_ilocked(struct xfs_da_args *args); 
int xfs_attr_get(struct xfs_da_args *args);

int xfs_attr_set(struct xfs_da_args *args);

int xfs_attr_set_args(struct xfs_da_args *args);

int xfs_has_attr(struct xfs_da_args *args);

int xfs_attr_remove_args(struct xfs_da_args *args);

bool xfs_attr_namecheck(const void *name, size_t length);

fs/xfs/libxfs/xfs_attr_leaf.c

+70 −30
Original line number Diff line number Diff line
@@ -659,18 +659,65 @@ xfs_attr_shortform_create( 
	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);

}



/*

 * Return -EEXIST if attr is found, or -ENOATTR if not

 * args:  args containing attribute name and namelen

 * sfep:  If not null, pointer will be set to the last attr entry found on

	  -EEXIST.  On -ENOATTR pointer is left at the last entry in the list

 * basep: If not null, pointer is set to the byte offset of the entry in the

 *	  list on -EEXIST.  On -ENOATTR, pointer is left at the byte offset of

 *	  the last entry in the list

 */

int

xfs_attr_sf_findname(

	struct xfs_da_args	 *args,

	struct xfs_attr_sf_entry **sfep,

	unsigned int		 *basep)

{

	struct xfs_attr_shortform *sf;

	struct xfs_attr_sf_entry *sfe;

	unsigned int		base = sizeof(struct xfs_attr_sf_hdr);

	int			size = 0;

	int			end;

	int			i;



	sf = (struct xfs_attr_shortform *)args->dp->i_afp->if_u1.if_data;

	sfe = &sf->list[0];

	end = sf->hdr.count;

	for (i = 0; i < end; sfe = XFS_ATTR_SF_NEXTENTRY(sfe),

			     base += size, i++) {

		size = XFS_ATTR_SF_ENTSIZE(sfe);

		if (!xfs_attr_match(args, sfe->namelen, sfe->nameval,

				    sfe->flags))

			continue;

		break;

	}



	if (sfep != NULL)

		*sfep = sfe;



	if (basep != NULL)

		*basep = base;



	if (i == end)

		return -ENOATTR;

	return -EEXIST;

}



/*

 * Add a name/value pair to the shortform attribute list.

 * Overflow from the inode has already been checked for.

 */

void

xfs_attr_shortform_add(xfs_da_args_t *args, int forkoff)

xfs_attr_shortform_add(

	struct xfs_da_args		*args,

	int				forkoff)

{

	xfs_attr_shortform_t *sf;

	xfs_attr_sf_entry_t *sfe;

	int i, offset, size;

	xfs_mount_t *mp;

	xfs_inode_t *dp;

	struct xfs_attr_shortform	*sf;

	struct xfs_attr_sf_entry	*sfe;

	int				offset, size;

	struct xfs_mount		*mp;

	struct xfs_inode		*dp;

	struct xfs_ifork		*ifp;



	trace_xfs_attr_sf_add(args);
@@ -682,11 +729,8 @@ xfs_attr_shortform_add(xfs_da_args_t *args, int forkoff) 
	ifp = dp->i_afp;

	ASSERT(ifp->if_flags & XFS_IFINLINE);

	sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;

	sfe = &sf->list[0];

	for (i = 0; i < sf->hdr.count; sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {

		ASSERT(!xfs_attr_match(args, sfe->namelen, sfe->nameval,

			sfe->flags));

	}

	if (xfs_attr_sf_findname(args, &sfe, NULL) == -EEXIST)

		ASSERT(0);



	offset = (char *)sfe - (char *)sf;

	size = XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
@@ -728,31 +772,27 @@ xfs_attr_fork_remove( 
 * Remove an attribute from the shortform attribute list structure.

 */

int

xfs_attr_shortform_remove(xfs_da_args_t *args)

xfs_attr_shortform_remove(

	struct xfs_da_args		*args)

{

	xfs_attr_shortform_t *sf;

	xfs_attr_sf_entry_t *sfe;

	int base, size=0, end, totsize, i;

	xfs_mount_t *mp;

	xfs_inode_t *dp;

	struct xfs_attr_shortform	*sf;

	struct xfs_attr_sf_entry	*sfe;

	int				size = 0, end, totsize;

	unsigned int			base;

	struct xfs_mount		*mp;

	struct xfs_inode		*dp;

	int				error;



	trace_xfs_attr_sf_remove(args);



	dp = args->dp;

	mp = dp->i_mount;

	base = sizeof(xfs_attr_sf_hdr_t);

	sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;

	sfe = &sf->list[0];

	end = sf->hdr.count;

	for (i = 0; i < end; sfe = XFS_ATTR_SF_NEXTENTRY(sfe),

					base += size, i++) {



	error = xfs_attr_sf_findname(args, &sfe, &base);

	if (error != -EEXIST)

		return error;

	size = XFS_ATTR_SF_ENTSIZE(sfe);

		if (xfs_attr_match(args, sfe->namelen, sfe->nameval,

				sfe->flags))

			break;

	}

	if (i == end)

		return -ENOATTR;



	/*

	 * Fix up the attribute fork data, covering the hole

fs/xfs/libxfs/xfs_attr_leaf.h

+3 −0
Original line number Diff line number Diff line
@@ -52,6 +52,9 @@ int xfs_attr_shortform_getvalue(struct xfs_da_args *args); 
int	xfs_attr_shortform_to_leaf(struct xfs_da_args *args,

			struct xfs_buf **leaf_bp);

int	xfs_attr_shortform_remove(struct xfs_da_args *args);

int	xfs_attr_sf_findname(struct xfs_da_args *args,

			     struct xfs_attr_sf_entry **sfep,

			     unsigned int *basep);

int	xfs_attr_shortform_allfit(struct xfs_buf *bp, struct xfs_inode *dp);

int	xfs_attr_shortform_bytesfit(struct xfs_inode *dp, int bytes);

xfs_failaddr_t xfs_attr_shortform_verify(struct xfs_inode *ip);