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This patch adds a new file ioctl to retrieve the parent pointer of a given inode Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| /* | ||
| * Copyright (c) 2015 Red Hat, Inc. | ||
| * All rights reserved. | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License as | ||
| * published by the Free Software Foundation. | ||
| * | ||
| * This program is distributed in the hope that it would be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write the Free Software Foundation | ||
| */ | ||
| #include "xfs.h" | ||
| #include "xfs_fs.h" | ||
| #include "xfs_format.h" | ||
| #include "xfs_log_format.h" | ||
| #include "xfs_shared.h" | ||
| #include "xfs_trans_resv.h" | ||
| #include "xfs_mount.h" | ||
| #include "xfs_bmap_btree.h" | ||
| #include "xfs_inode.h" | ||
| #include "xfs_error.h" | ||
| #include "xfs_trace.h" | ||
| #include "xfs_trans.h" | ||
| #include "xfs_da_format.h" | ||
| #include "xfs_da_btree.h" | ||
| #include "xfs_attr.h" | ||
| #include "xfs_ioctl.h" | ||
| #include "xfs_parent.h" | ||
| #include "xfs_da_btree.h" | ||
|
|
||
| /* | ||
| * Get the parent pointers for a given inode | ||
| * | ||
| * Returns 0 on success and non zero on error | ||
| */ | ||
| int | ||
| xfs_attr_get_parent_pointer(struct xfs_inode *ip, | ||
| struct xfs_pptr_info *ppi) | ||
|
|
||
| { | ||
|
|
||
| struct xfs_attrlist *alist; | ||
| struct xfs_attrlist_ent *aent; | ||
| struct xfs_parent_ptr *xpp; | ||
| struct xfs_parent_name_rec *xpnr; | ||
| char *namebuf; | ||
| unsigned int namebuf_size; | ||
| int name_len; | ||
| int error = 0; | ||
| unsigned int ioc_flags = XFS_IOC_ATTR_PARENT; | ||
| unsigned int flags = XFS_ATTR_PARENT; | ||
| int i; | ||
| struct xfs_attr_list_context context; | ||
| struct xfs_da_args args; | ||
|
|
||
| /* Allocate a buffer to store the attribute names */ | ||
| namebuf_size = sizeof(struct xfs_attrlist) + | ||
| (ppi->pi_ptrs_size) * sizeof(struct xfs_attrlist_ent); | ||
| namebuf = kvzalloc(namebuf_size, GFP_KERNEL); | ||
| if (!namebuf) | ||
| return -ENOMEM; | ||
|
|
||
| memset(&context, 0, sizeof(struct xfs_attr_list_context)); | ||
| error = xfs_ioc_attr_list_context_init(ip, namebuf, namebuf_size, | ||
| ioc_flags, &context); | ||
|
|
||
| /* Copy the cursor provided by caller */ | ||
| memcpy(&context.cursor, &ppi->pi_cursor, | ||
| sizeof(struct xfs_attrlist_cursor)); | ||
|
|
||
| if (error) | ||
| goto out_kfree; | ||
|
|
||
| xfs_ilock(ip, XFS_ILOCK_EXCL); | ||
|
|
||
| error = xfs_attr_list_ilocked(&context); | ||
| if (error) | ||
| goto out_kfree; | ||
|
|
||
| alist = (struct xfs_attrlist *)namebuf; | ||
| for (i = 0; i < alist->al_count; i++) { | ||
| xpp = XFS_PPINFO_TO_PP(ppi, i); | ||
| memset(xpp, 0, sizeof(struct xfs_parent_ptr)); | ||
| aent = (struct xfs_attrlist_ent *) | ||
| &namebuf[alist->al_offset[i]]; | ||
| xpnr = (struct xfs_parent_name_rec *)(aent->a_name); | ||
|
|
||
| if (aent->a_valuelen > XFS_PPTR_MAXNAMELEN) { | ||
| error = -ERANGE; | ||
| goto out_kfree; | ||
| } | ||
| name_len = aent->a_valuelen; | ||
|
|
||
| memset(&args, 0, sizeof(args)); | ||
| args.geo = ip->i_mount->m_attr_geo; | ||
| args.whichfork = XFS_ATTR_FORK; | ||
| args.dp = ip; | ||
| args.name = (char *)xpnr; | ||
| args.namelen = sizeof(struct xfs_parent_name_rec); | ||
| args.attr_filter = flags; | ||
| args.hashval = xfs_da_hashname(args.name, args.namelen); | ||
| args.value = (unsigned char *)(xpp->xpp_name); | ||
| args.valuelen = name_len; | ||
| args.op_flags = XFS_DA_OP_OKNOENT; | ||
|
|
||
| error = xfs_attr_get_ilocked(&args); | ||
| error = (error == -EEXIST ? 0 : error); | ||
| if (error) | ||
| goto out_kfree; | ||
|
|
||
| xpp->xpp_namelen = name_len; | ||
| xfs_init_parent_ptr(xpp, xpnr); | ||
| } | ||
| ppi->pi_ptrs_used = alist->al_count; | ||
| if (!alist->al_more) | ||
| ppi->pi_flags |= XFS_PPTR_OFLAG_DONE; | ||
|
|
||
| /* Update the caller with the current cursor position */ | ||
| memcpy(&ppi->pi_cursor, &context.cursor, | ||
| sizeof(struct xfs_attrlist_cursor)); | ||
|
|
||
| out_kfree: | ||
| xfs_iunlock(ip, XFS_ILOCK_EXCL); | ||
| kmem_free(namebuf); | ||
|
|
||
| return error; | ||
| } | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| /* | ||
| * Copyright (c) 2017 Oracle, Inc. | ||
| * All Rights Reserved. | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License as | ||
| * published by the Free Software Foundation. | ||
| * | ||
| * This program is distributed in the hope that it would be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write the Free Software Foundation Inc. | ||
| */ | ||
| #ifndef __XFS_PARENT_UTILS_H__ | ||
| #define __XFS_PARENT_UTILS_H__ | ||
|
|
||
| int xfs_attr_get_parent_pointer(struct xfs_inode *ip, | ||
| struct xfs_pptr_info *ppi); | ||
| #endif /* __XFS_PARENT_UTILS_H__ */ |