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xfs: parent pointer attribute creation
Add parent pointer attribute during xfs_create, and subroutines to initialize attributes Signed-off-by: Dave Chinner <dchinner@redhat.com> 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 +1,149 @@ | ||
| // SPDX-License-Identifier: GPL-2.0 | ||
| /* | ||
| * Copyright (c) 2022 Oracle, Inc. | ||
| * All rights reserved. | ||
| */ | ||
| #include "xfs.h" | ||
| #include "xfs_fs.h" | ||
| #include "xfs_format.h" | ||
| #include "xfs_da_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_btree.h" | ||
| #include "xfs_attr.h" | ||
| #include "xfs_da_btree.h" | ||
| #include "xfs_attr_sf.h" | ||
| #include "xfs_bmap.h" | ||
| #include "xfs_defer.h" | ||
| #include "xfs_log.h" | ||
| #include "xfs_xattr.h" | ||
| #include "xfs_parent.h" | ||
| #include "xfs_trans_space.h" | ||
|
|
||
| /* | ||
| * Parent pointer attribute handling. | ||
| * | ||
| * Because the attribute value is a filename component, it will never be longer | ||
| * than 255 bytes. This means the attribute will always be a local format | ||
| * attribute as it is xfs_attr_leaf_entsize_local_max() for v5 filesystems will | ||
| * always be larger than this (max is 75% of block size). | ||
| * | ||
| * Creating a new parent attribute will always create a new attribute - there | ||
| * should never, ever be an existing attribute in the tree for a new inode. | ||
| * ENOSPC behavior is problematic - creating the inode without the parent | ||
| * pointer is effectively a corruption, so we allow parent attribute creation | ||
| * to dip into the reserve block pool to avoid unexpected ENOSPC errors from | ||
| * occurring. | ||
| */ | ||
|
|
||
|
|
||
| /* Initializes a xfs_parent_name_rec to be stored as an attribute name */ | ||
| void | ||
| xfs_init_parent_name_rec( | ||
| struct xfs_parent_name_rec *rec, | ||
| struct xfs_inode *ip, | ||
| uint32_t p_diroffset) | ||
| { | ||
| xfs_ino_t p_ino = ip->i_ino; | ||
| uint32_t p_gen = VFS_I(ip)->i_generation; | ||
|
|
||
| rec->p_ino = cpu_to_be64(p_ino); | ||
| rec->p_gen = cpu_to_be32(p_gen); | ||
| rec->p_diroffset = cpu_to_be32(p_diroffset); | ||
| } | ||
|
|
||
| /* Initializes a xfs_parent_name_irec from an xfs_parent_name_rec */ | ||
| void | ||
| xfs_init_parent_name_irec( | ||
| struct xfs_parent_name_irec *irec, | ||
| struct xfs_parent_name_rec *rec) | ||
| { | ||
| irec->p_ino = be64_to_cpu(rec->p_ino); | ||
| irec->p_gen = be32_to_cpu(rec->p_gen); | ||
| irec->p_diroffset = be32_to_cpu(rec->p_diroffset); | ||
| } | ||
|
|
||
| int | ||
| xfs_parent_init( | ||
| struct xfs_mount *mp, | ||
| struct xfs_parent_defer **parentp) | ||
| { | ||
| struct xfs_parent_defer *parent; | ||
| int error; | ||
|
|
||
| if (!xfs_has_parent(mp)) | ||
| return 0; | ||
|
|
||
| error = xfs_attr_grab_log_assist(mp); | ||
| if (error) | ||
| return error; | ||
|
|
||
| parent = kzalloc(sizeof(*parent), GFP_KERNEL); | ||
| if (!parent) | ||
| return -ENOMEM; | ||
|
|
||
| /* init parent da_args */ | ||
| parent->args.geo = mp->m_attr_geo; | ||
| parent->args.whichfork = XFS_ATTR_FORK; | ||
| parent->args.attr_filter = XFS_ATTR_PARENT; | ||
| parent->args.op_flags = XFS_DA_OP_OKNOENT | XFS_DA_OP_LOGGED; | ||
| parent->args.name = (const uint8_t *)&parent->rec; | ||
| parent->args.namelen = sizeof(struct xfs_parent_name_rec); | ||
|
|
||
| *parentp = parent; | ||
| return 0; | ||
| } | ||
|
|
||
| int | ||
| xfs_parent_defer_add( | ||
| struct xfs_trans *tp, | ||
| struct xfs_parent_defer *parent, | ||
| struct xfs_inode *dp, | ||
| struct xfs_name *parent_name, | ||
| xfs_dir2_dataptr_t diroffset, | ||
| struct xfs_inode *child) | ||
| { | ||
| struct xfs_da_args *args = &parent->args; | ||
|
|
||
| xfs_init_parent_name_rec(&parent->rec, dp, diroffset); | ||
| args->hashval = xfs_da_hashname(args->name, args->namelen); | ||
|
|
||
| args->trans = tp; | ||
| args->dp = child; | ||
| if (parent_name) { | ||
| parent->args.value = (void *)parent_name->name; | ||
| parent->args.valuelen = parent_name->len; | ||
| } | ||
|
|
||
| return xfs_attr_defer_add(args); | ||
| } | ||
|
|
||
| void | ||
| xfs_parent_cancel( | ||
| xfs_mount_t *mp, | ||
| struct xfs_parent_defer *parent) | ||
| { | ||
| xlog_drop_incompat_feat(mp->m_log); | ||
| kfree(parent); | ||
| } | ||
|
|
||
| unsigned int | ||
| xfs_pptr_calc_space_res( | ||
| struct xfs_mount *mp, | ||
| unsigned int namelen) | ||
| { | ||
| /* | ||
| * Pptrs are always the first attr in an attr tree, and never larger | ||
| * than a block | ||
| */ | ||
| return XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK) + | ||
| XFS_NEXTENTADD_SPACE_RES(mp, namelen, XFS_ATTR_FORK); | ||
| } | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| // SPDX-License-Identifier: GPL-2.0 | ||
| /* | ||
| * Copyright (c) 2022 Oracle, Inc. | ||
| * All Rights Reserved. | ||
| */ | ||
| #ifndef __XFS_PARENT_H__ | ||
| #define __XFS_PARENT_H__ | ||
|
|
||
| /* | ||
| * Dynamically allocd structure used to wrap the needed data to pass around | ||
| * the defer ops machinery | ||
| */ | ||
| struct xfs_parent_defer { | ||
| struct xfs_parent_name_rec rec; | ||
| struct xfs_da_args args; | ||
| }; | ||
|
|
||
| /* | ||
| * Parent pointer attribute prototypes | ||
| */ | ||
| void xfs_init_parent_name_rec(struct xfs_parent_name_rec *rec, | ||
| struct xfs_inode *ip, | ||
| uint32_t p_diroffset); | ||
| void xfs_init_parent_name_irec(struct xfs_parent_name_irec *irec, | ||
| struct xfs_parent_name_rec *rec); | ||
| int xfs_parent_init(xfs_mount_t *mp, struct xfs_parent_defer **parentp); | ||
| int xfs_parent_defer_add(struct xfs_trans *tp, struct xfs_parent_defer *parent, | ||
| struct xfs_inode *dp, struct xfs_name *parent_name, | ||
| xfs_dir2_dataptr_t diroffset, struct xfs_inode *child); | ||
| void xfs_parent_cancel(xfs_mount_t *mp, struct xfs_parent_defer *parent); | ||
| unsigned int xfs_pptr_calc_space_res(struct xfs_mount *mp, | ||
| unsigned int namelen); | ||
|
|
||
| #endif /* __XFS_PARENT_H__ */ |
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