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![Christoph Hellwig](/assets/img/avatar_default.png)
The in-memory XFS_IFEXTENTS is now only used to check if an inode with extents still needs the extents to be read into memory before doing operations that need the extent map. Add a new xfs_need_iread_extents helper that returns true for btree format forks that do not have any entries in the in-memory extent btree, and use that instead of checking the XFS_IFEXTENTS flag. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
757 lines
19 KiB
C
757 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2006 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_trans.h"
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#include "xfs_inode_item.h"
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#include "xfs_btree.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_bmap.h"
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#include "xfs_error.h"
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#include "xfs_trace.h"
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#include "xfs_da_format.h"
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#include "xfs_da_btree.h"
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#include "xfs_dir2_priv.h"
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#include "xfs_attr_leaf.h"
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#include "xfs_types.h"
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#include "xfs_errortag.h"
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kmem_zone_t *xfs_ifork_zone;
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void
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xfs_init_local_fork(
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struct xfs_inode *ip,
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int whichfork,
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const void *data,
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int64_t size)
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{
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struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
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int mem_size = size, real_size = 0;
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bool zero_terminate;
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/*
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* If we are using the local fork to store a symlink body we need to
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* zero-terminate it so that we can pass it back to the VFS directly.
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* Overallocate the in-memory fork by one for that and add a zero
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* to terminate it below.
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*/
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zero_terminate = S_ISLNK(VFS_I(ip)->i_mode);
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if (zero_terminate)
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mem_size++;
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if (size) {
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real_size = roundup(mem_size, 4);
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ifp->if_u1.if_data = kmem_alloc(real_size, KM_NOFS);
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memcpy(ifp->if_u1.if_data, data, size);
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if (zero_terminate)
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ifp->if_u1.if_data[size] = '\0';
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} else {
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ifp->if_u1.if_data = NULL;
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}
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ifp->if_bytes = size;
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}
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/*
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* The file is in-lined in the on-disk inode.
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*/
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STATIC int
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xfs_iformat_local(
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xfs_inode_t *ip,
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xfs_dinode_t *dip,
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int whichfork,
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int size)
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{
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/*
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* If the size is unreasonable, then something
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* is wrong and we just bail out rather than crash in
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* kmem_alloc() or memcpy() below.
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*/
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if (unlikely(size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) {
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xfs_warn(ip->i_mount,
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"corrupt inode %Lu (bad size %d for local fork, size = %zd).",
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(unsigned long long) ip->i_ino, size,
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XFS_DFORK_SIZE(dip, ip->i_mount, whichfork));
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xfs_inode_verifier_error(ip, -EFSCORRUPTED,
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"xfs_iformat_local", dip, sizeof(*dip),
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__this_address);
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return -EFSCORRUPTED;
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}
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xfs_init_local_fork(ip, whichfork, XFS_DFORK_PTR(dip, whichfork), size);
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return 0;
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}
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/*
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* The file consists of a set of extents all of which fit into the on-disk
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* inode.
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*/
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STATIC int
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xfs_iformat_extents(
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struct xfs_inode *ip,
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struct xfs_dinode *dip,
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int whichfork)
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{
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
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int state = xfs_bmap_fork_to_state(whichfork);
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int nex = XFS_DFORK_NEXTENTS(dip, whichfork);
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int size = nex * sizeof(xfs_bmbt_rec_t);
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struct xfs_iext_cursor icur;
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struct xfs_bmbt_rec *dp;
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struct xfs_bmbt_irec new;
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int i;
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/*
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* If the number of extents is unreasonable, then something is wrong and
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* we just bail out rather than crash in kmem_alloc() or memcpy() below.
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*/
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if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, mp, whichfork))) {
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xfs_warn(ip->i_mount, "corrupt inode %Lu ((a)extents = %d).",
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(unsigned long long) ip->i_ino, nex);
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xfs_inode_verifier_error(ip, -EFSCORRUPTED,
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"xfs_iformat_extents(1)", dip, sizeof(*dip),
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__this_address);
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return -EFSCORRUPTED;
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}
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ifp->if_bytes = 0;
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ifp->if_u1.if_root = NULL;
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ifp->if_height = 0;
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if (size) {
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dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork);
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xfs_iext_first(ifp, &icur);
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for (i = 0; i < nex; i++, dp++) {
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xfs_failaddr_t fa;
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xfs_bmbt_disk_get_all(dp, &new);
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fa = xfs_bmap_validate_extent(ip, whichfork, &new);
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if (fa) {
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xfs_inode_verifier_error(ip, -EFSCORRUPTED,
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"xfs_iformat_extents(2)",
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dp, sizeof(*dp), fa);
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return -EFSCORRUPTED;
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}
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xfs_iext_insert(ip, &icur, &new, state);
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trace_xfs_read_extent(ip, &icur, state, _THIS_IP_);
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xfs_iext_next(ifp, &icur);
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}
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}
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return 0;
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}
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/*
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* The file has too many extents to fit into
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* the inode, so they are in B-tree format.
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* Allocate a buffer for the root of the B-tree
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* and copy the root into it. The i_extents
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* field will remain NULL until all of the
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* extents are read in (when they are needed).
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*/
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STATIC int
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xfs_iformat_btree(
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xfs_inode_t *ip,
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xfs_dinode_t *dip,
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int whichfork)
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{
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struct xfs_mount *mp = ip->i_mount;
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xfs_bmdr_block_t *dfp;
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struct xfs_ifork *ifp;
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/* REFERENCED */
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int nrecs;
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int size;
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int level;
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ifp = XFS_IFORK_PTR(ip, whichfork);
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dfp = (xfs_bmdr_block_t *)XFS_DFORK_PTR(dip, whichfork);
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size = XFS_BMAP_BROOT_SPACE(mp, dfp);
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nrecs = be16_to_cpu(dfp->bb_numrecs);
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level = be16_to_cpu(dfp->bb_level);
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/*
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* blow out if -- fork has less extents than can fit in
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* fork (fork shouldn't be a btree format), root btree
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* block has more records than can fit into the fork,
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* or the number of extents is greater than the number of
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* blocks.
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*/
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if (unlikely(ifp->if_nextents <= XFS_IFORK_MAXEXT(ip, whichfork) ||
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nrecs == 0 ||
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XFS_BMDR_SPACE_CALC(nrecs) >
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XFS_DFORK_SIZE(dip, mp, whichfork) ||
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ifp->if_nextents > ip->i_nblocks) ||
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level == 0 || level > XFS_BM_MAXLEVELS(mp, whichfork)) {
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xfs_warn(mp, "corrupt inode %Lu (btree).",
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(unsigned long long) ip->i_ino);
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xfs_inode_verifier_error(ip, -EFSCORRUPTED,
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"xfs_iformat_btree", dfp, size,
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__this_address);
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return -EFSCORRUPTED;
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}
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ifp->if_broot_bytes = size;
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ifp->if_broot = kmem_alloc(size, KM_NOFS);
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ASSERT(ifp->if_broot != NULL);
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/*
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* Copy and convert from the on-disk structure
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* to the in-memory structure.
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*/
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xfs_bmdr_to_bmbt(ip, dfp, XFS_DFORK_SIZE(dip, ip->i_mount, whichfork),
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ifp->if_broot, size);
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ifp->if_bytes = 0;
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ifp->if_u1.if_root = NULL;
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ifp->if_height = 0;
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return 0;
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}
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int
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xfs_iformat_data_fork(
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struct xfs_inode *ip,
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struct xfs_dinode *dip)
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{
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struct inode *inode = VFS_I(ip);
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int error;
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/*
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* Initialize the extent count early, as the per-format routines may
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* depend on it.
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*/
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ip->i_df.if_format = dip->di_format;
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ip->i_df.if_nextents = be32_to_cpu(dip->di_nextents);
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switch (inode->i_mode & S_IFMT) {
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case S_IFIFO:
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case S_IFCHR:
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case S_IFBLK:
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case S_IFSOCK:
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ip->i_disk_size = 0;
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inode->i_rdev = xfs_to_linux_dev_t(xfs_dinode_get_rdev(dip));
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return 0;
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case S_IFREG:
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case S_IFLNK:
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case S_IFDIR:
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switch (ip->i_df.if_format) {
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case XFS_DINODE_FMT_LOCAL:
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error = xfs_iformat_local(ip, dip, XFS_DATA_FORK,
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be64_to_cpu(dip->di_size));
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if (!error)
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error = xfs_ifork_verify_local_data(ip);
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return error;
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case XFS_DINODE_FMT_EXTENTS:
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return xfs_iformat_extents(ip, dip, XFS_DATA_FORK);
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case XFS_DINODE_FMT_BTREE:
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return xfs_iformat_btree(ip, dip, XFS_DATA_FORK);
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default:
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xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__,
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dip, sizeof(*dip), __this_address);
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return -EFSCORRUPTED;
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}
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break;
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default:
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xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, dip,
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sizeof(*dip), __this_address);
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return -EFSCORRUPTED;
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}
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}
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static uint16_t
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xfs_dfork_attr_shortform_size(
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struct xfs_dinode *dip)
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{
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struct xfs_attr_shortform *atp =
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(struct xfs_attr_shortform *)XFS_DFORK_APTR(dip);
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return be16_to_cpu(atp->hdr.totsize);
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}
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struct xfs_ifork *
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xfs_ifork_alloc(
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enum xfs_dinode_fmt format,
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xfs_extnum_t nextents)
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{
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struct xfs_ifork *ifp;
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ifp = kmem_cache_zalloc(xfs_ifork_zone, GFP_NOFS | __GFP_NOFAIL);
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ifp->if_format = format;
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ifp->if_nextents = nextents;
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return ifp;
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}
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int
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xfs_iformat_attr_fork(
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struct xfs_inode *ip,
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struct xfs_dinode *dip)
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{
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int error = 0;
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/*
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* Initialize the extent count early, as the per-format routines may
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* depend on it.
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*/
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ip->i_afp = xfs_ifork_alloc(dip->di_aformat,
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be16_to_cpu(dip->di_anextents));
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switch (ip->i_afp->if_format) {
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case XFS_DINODE_FMT_LOCAL:
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error = xfs_iformat_local(ip, dip, XFS_ATTR_FORK,
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xfs_dfork_attr_shortform_size(dip));
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if (!error)
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error = xfs_ifork_verify_local_attr(ip);
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break;
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case XFS_DINODE_FMT_EXTENTS:
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error = xfs_iformat_extents(ip, dip, XFS_ATTR_FORK);
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break;
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case XFS_DINODE_FMT_BTREE:
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error = xfs_iformat_btree(ip, dip, XFS_ATTR_FORK);
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break;
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default:
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xfs_inode_verifier_error(ip, error, __func__, dip,
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sizeof(*dip), __this_address);
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error = -EFSCORRUPTED;
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break;
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}
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if (error) {
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kmem_cache_free(xfs_ifork_zone, ip->i_afp);
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ip->i_afp = NULL;
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}
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return error;
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}
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/*
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* Reallocate the space for if_broot based on the number of records
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* being added or deleted as indicated in rec_diff. Move the records
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* and pointers in if_broot to fit the new size. When shrinking this
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* will eliminate holes between the records and pointers created by
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* the caller. When growing this will create holes to be filled in
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* by the caller.
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*
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* The caller must not request to add more records than would fit in
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* the on-disk inode root. If the if_broot is currently NULL, then
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* if we are adding records, one will be allocated. The caller must also
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* not request that the number of records go below zero, although
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* it can go to zero.
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*
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* ip -- the inode whose if_broot area is changing
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* ext_diff -- the change in the number of records, positive or negative,
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* requested for the if_broot array.
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*/
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void
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xfs_iroot_realloc(
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xfs_inode_t *ip,
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int rec_diff,
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int whichfork)
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{
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struct xfs_mount *mp = ip->i_mount;
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int cur_max;
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struct xfs_ifork *ifp;
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struct xfs_btree_block *new_broot;
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int new_max;
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size_t new_size;
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char *np;
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char *op;
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/*
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* Handle the degenerate case quietly.
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*/
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if (rec_diff == 0) {
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return;
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}
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ifp = XFS_IFORK_PTR(ip, whichfork);
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if (rec_diff > 0) {
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/*
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* If there wasn't any memory allocated before, just
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* allocate it now and get out.
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*/
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if (ifp->if_broot_bytes == 0) {
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new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, rec_diff);
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ifp->if_broot = kmem_alloc(new_size, KM_NOFS);
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ifp->if_broot_bytes = (int)new_size;
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return;
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}
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/*
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* If there is already an existing if_broot, then we need
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* to realloc() it and shift the pointers to their new
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* location. The records don't change location because
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* they are kept butted up against the btree block header.
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*/
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cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0);
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new_max = cur_max + rec_diff;
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new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, new_max);
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ifp->if_broot = krealloc(ifp->if_broot, new_size,
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GFP_NOFS | __GFP_NOFAIL);
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op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
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ifp->if_broot_bytes);
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np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
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(int)new_size);
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ifp->if_broot_bytes = (int)new_size;
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ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <=
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XFS_IFORK_SIZE(ip, whichfork));
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memmove(np, op, cur_max * (uint)sizeof(xfs_fsblock_t));
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return;
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}
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/*
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* rec_diff is less than 0. In this case, we are shrinking the
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* if_broot buffer. It must already exist. If we go to zero
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* records, just get rid of the root and clear the status bit.
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*/
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ASSERT((ifp->if_broot != NULL) && (ifp->if_broot_bytes > 0));
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cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0);
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new_max = cur_max + rec_diff;
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ASSERT(new_max >= 0);
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if (new_max > 0)
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new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, new_max);
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else
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new_size = 0;
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if (new_size > 0) {
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new_broot = kmem_alloc(new_size, KM_NOFS);
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/*
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* First copy over the btree block header.
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*/
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memcpy(new_broot, ifp->if_broot,
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XFS_BMBT_BLOCK_LEN(ip->i_mount));
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} else {
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new_broot = NULL;
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}
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/*
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* Only copy the records and pointers if there are any.
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*/
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if (new_max > 0) {
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/*
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* First copy the records.
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*/
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op = (char *)XFS_BMBT_REC_ADDR(mp, ifp->if_broot, 1);
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np = (char *)XFS_BMBT_REC_ADDR(mp, new_broot, 1);
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memcpy(np, op, new_max * (uint)sizeof(xfs_bmbt_rec_t));
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/*
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* Then copy the pointers.
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*/
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op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
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ifp->if_broot_bytes);
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np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, new_broot, 1,
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(int)new_size);
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memcpy(np, op, new_max * (uint)sizeof(xfs_fsblock_t));
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}
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kmem_free(ifp->if_broot);
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ifp->if_broot = new_broot;
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ifp->if_broot_bytes = (int)new_size;
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if (ifp->if_broot)
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ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <=
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XFS_IFORK_SIZE(ip, whichfork));
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* This is called when the amount of space needed for if_data
|
|
* is increased or decreased. The change in size is indicated by
|
|
* the number of bytes that need to be added or deleted in the
|
|
* byte_diff parameter.
|
|
*
|
|
* If the amount of space needed has decreased below the size of the
|
|
* inline buffer, then switch to using the inline buffer. Otherwise,
|
|
* use kmem_realloc() or kmem_alloc() to adjust the size of the buffer
|
|
* to what is needed.
|
|
*
|
|
* ip -- the inode whose if_data area is changing
|
|
* byte_diff -- the change in the number of bytes, positive or negative,
|
|
* requested for the if_data array.
|
|
*/
|
|
void
|
|
xfs_idata_realloc(
|
|
struct xfs_inode *ip,
|
|
int64_t byte_diff,
|
|
int whichfork)
|
|
{
|
|
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
int64_t new_size = ifp->if_bytes + byte_diff;
|
|
|
|
ASSERT(new_size >= 0);
|
|
ASSERT(new_size <= XFS_IFORK_SIZE(ip, whichfork));
|
|
|
|
if (byte_diff == 0)
|
|
return;
|
|
|
|
if (new_size == 0) {
|
|
kmem_free(ifp->if_u1.if_data);
|
|
ifp->if_u1.if_data = NULL;
|
|
ifp->if_bytes = 0;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* For inline data, the underlying buffer must be a multiple of 4 bytes
|
|
* in size so that it can be logged and stay on word boundaries.
|
|
* We enforce that here.
|
|
*/
|
|
ifp->if_u1.if_data = krealloc(ifp->if_u1.if_data, roundup(new_size, 4),
|
|
GFP_NOFS | __GFP_NOFAIL);
|
|
ifp->if_bytes = new_size;
|
|
}
|
|
|
|
void
|
|
xfs_idestroy_fork(
|
|
struct xfs_ifork *ifp)
|
|
{
|
|
if (ifp->if_broot != NULL) {
|
|
kmem_free(ifp->if_broot);
|
|
ifp->if_broot = NULL;
|
|
}
|
|
|
|
switch (ifp->if_format) {
|
|
case XFS_DINODE_FMT_LOCAL:
|
|
kmem_free(ifp->if_u1.if_data);
|
|
ifp->if_u1.if_data = NULL;
|
|
break;
|
|
case XFS_DINODE_FMT_EXTENTS:
|
|
case XFS_DINODE_FMT_BTREE:
|
|
if (ifp->if_height)
|
|
xfs_iext_destroy(ifp);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Convert in-core extents to on-disk form
|
|
*
|
|
* In the case of the data fork, the in-core and on-disk fork sizes can be
|
|
* different due to delayed allocation extents. We only copy on-disk extents
|
|
* here, so callers must always use the physical fork size to determine the
|
|
* size of the buffer passed to this routine. We will return the size actually
|
|
* used.
|
|
*/
|
|
int
|
|
xfs_iextents_copy(
|
|
struct xfs_inode *ip,
|
|
struct xfs_bmbt_rec *dp,
|
|
int whichfork)
|
|
{
|
|
int state = xfs_bmap_fork_to_state(whichfork);
|
|
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
struct xfs_iext_cursor icur;
|
|
struct xfs_bmbt_irec rec;
|
|
int64_t copied = 0;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL | XFS_ILOCK_SHARED));
|
|
ASSERT(ifp->if_bytes > 0);
|
|
|
|
for_each_xfs_iext(ifp, &icur, &rec) {
|
|
if (isnullstartblock(rec.br_startblock))
|
|
continue;
|
|
ASSERT(xfs_bmap_validate_extent(ip, whichfork, &rec) == NULL);
|
|
xfs_bmbt_disk_set_all(dp, &rec);
|
|
trace_xfs_write_extent(ip, &icur, state, _RET_IP_);
|
|
copied += sizeof(struct xfs_bmbt_rec);
|
|
dp++;
|
|
}
|
|
|
|
ASSERT(copied > 0);
|
|
ASSERT(copied <= ifp->if_bytes);
|
|
return copied;
|
|
}
|
|
|
|
/*
|
|
* Each of the following cases stores data into the same region
|
|
* of the on-disk inode, so only one of them can be valid at
|
|
* any given time. While it is possible to have conflicting formats
|
|
* and log flags, e.g. having XFS_ILOG_?DATA set when the fork is
|
|
* in EXTENTS format, this can only happen when the fork has
|
|
* changed formats after being modified but before being flushed.
|
|
* In these cases, the format always takes precedence, because the
|
|
* format indicates the current state of the fork.
|
|
*/
|
|
void
|
|
xfs_iflush_fork(
|
|
xfs_inode_t *ip,
|
|
xfs_dinode_t *dip,
|
|
struct xfs_inode_log_item *iip,
|
|
int whichfork)
|
|
{
|
|
char *cp;
|
|
struct xfs_ifork *ifp;
|
|
xfs_mount_t *mp;
|
|
static const short brootflag[2] =
|
|
{ XFS_ILOG_DBROOT, XFS_ILOG_ABROOT };
|
|
static const short dataflag[2] =
|
|
{ XFS_ILOG_DDATA, XFS_ILOG_ADATA };
|
|
static const short extflag[2] =
|
|
{ XFS_ILOG_DEXT, XFS_ILOG_AEXT };
|
|
|
|
if (!iip)
|
|
return;
|
|
ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
/*
|
|
* This can happen if we gave up in iformat in an error path,
|
|
* for the attribute fork.
|
|
*/
|
|
if (!ifp) {
|
|
ASSERT(whichfork == XFS_ATTR_FORK);
|
|
return;
|
|
}
|
|
cp = XFS_DFORK_PTR(dip, whichfork);
|
|
mp = ip->i_mount;
|
|
switch (ifp->if_format) {
|
|
case XFS_DINODE_FMT_LOCAL:
|
|
if ((iip->ili_fields & dataflag[whichfork]) &&
|
|
(ifp->if_bytes > 0)) {
|
|
ASSERT(ifp->if_u1.if_data != NULL);
|
|
ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork));
|
|
memcpy(cp, ifp->if_u1.if_data, ifp->if_bytes);
|
|
}
|
|
break;
|
|
|
|
case XFS_DINODE_FMT_EXTENTS:
|
|
if ((iip->ili_fields & extflag[whichfork]) &&
|
|
(ifp->if_bytes > 0)) {
|
|
ASSERT(ifp->if_nextents > 0);
|
|
(void)xfs_iextents_copy(ip, (xfs_bmbt_rec_t *)cp,
|
|
whichfork);
|
|
}
|
|
break;
|
|
|
|
case XFS_DINODE_FMT_BTREE:
|
|
if ((iip->ili_fields & brootflag[whichfork]) &&
|
|
(ifp->if_broot_bytes > 0)) {
|
|
ASSERT(ifp->if_broot != NULL);
|
|
ASSERT(XFS_BMAP_BMDR_SPACE(ifp->if_broot) <=
|
|
XFS_IFORK_SIZE(ip, whichfork));
|
|
xfs_bmbt_to_bmdr(mp, ifp->if_broot, ifp->if_broot_bytes,
|
|
(xfs_bmdr_block_t *)cp,
|
|
XFS_DFORK_SIZE(dip, mp, whichfork));
|
|
}
|
|
break;
|
|
|
|
case XFS_DINODE_FMT_DEV:
|
|
if (iip->ili_fields & XFS_ILOG_DEV) {
|
|
ASSERT(whichfork == XFS_DATA_FORK);
|
|
xfs_dinode_put_rdev(dip,
|
|
linux_to_xfs_dev_t(VFS_I(ip)->i_rdev));
|
|
}
|
|
break;
|
|
|
|
default:
|
|
ASSERT(0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Convert bmap state flags to an inode fork. */
|
|
struct xfs_ifork *
|
|
xfs_iext_state_to_fork(
|
|
struct xfs_inode *ip,
|
|
int state)
|
|
{
|
|
if (state & BMAP_COWFORK)
|
|
return ip->i_cowfp;
|
|
else if (state & BMAP_ATTRFORK)
|
|
return ip->i_afp;
|
|
return &ip->i_df;
|
|
}
|
|
|
|
/*
|
|
* Initialize an inode's copy-on-write fork.
|
|
*/
|
|
void
|
|
xfs_ifork_init_cow(
|
|
struct xfs_inode *ip)
|
|
{
|
|
if (ip->i_cowfp)
|
|
return;
|
|
|
|
ip->i_cowfp = kmem_cache_zalloc(xfs_ifork_zone,
|
|
GFP_NOFS | __GFP_NOFAIL);
|
|
ip->i_cowfp->if_format = XFS_DINODE_FMT_EXTENTS;
|
|
}
|
|
|
|
/* Verify the inline contents of the data fork of an inode. */
|
|
int
|
|
xfs_ifork_verify_local_data(
|
|
struct xfs_inode *ip)
|
|
{
|
|
xfs_failaddr_t fa = NULL;
|
|
|
|
switch (VFS_I(ip)->i_mode & S_IFMT) {
|
|
case S_IFDIR:
|
|
fa = xfs_dir2_sf_verify(ip);
|
|
break;
|
|
case S_IFLNK:
|
|
fa = xfs_symlink_shortform_verify(ip);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (fa) {
|
|
xfs_inode_verifier_error(ip, -EFSCORRUPTED, "data fork",
|
|
ip->i_df.if_u1.if_data, ip->i_df.if_bytes, fa);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Verify the inline contents of the attr fork of an inode. */
|
|
int
|
|
xfs_ifork_verify_local_attr(
|
|
struct xfs_inode *ip)
|
|
{
|
|
struct xfs_ifork *ifp = ip->i_afp;
|
|
xfs_failaddr_t fa;
|
|
|
|
if (!ifp)
|
|
fa = __this_address;
|
|
else
|
|
fa = xfs_attr_shortform_verify(ip);
|
|
|
|
if (fa) {
|
|
xfs_inode_verifier_error(ip, -EFSCORRUPTED, "attr fork",
|
|
ifp ? ifp->if_u1.if_data : NULL,
|
|
ifp ? ifp->if_bytes : 0, fa);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
xfs_iext_count_may_overflow(
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
int nr_to_add)
|
|
{
|
|
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
uint64_t max_exts;
|
|
uint64_t nr_exts;
|
|
|
|
if (whichfork == XFS_COW_FORK)
|
|
return 0;
|
|
|
|
max_exts = (whichfork == XFS_ATTR_FORK) ? MAXAEXTNUM : MAXEXTNUM;
|
|
|
|
if (XFS_TEST_ERROR(false, ip->i_mount, XFS_ERRTAG_REDUCE_MAX_IEXTENTS))
|
|
max_exts = 10;
|
|
|
|
nr_exts = ifp->if_nextents + nr_to_add;
|
|
if (nr_exts < ifp->if_nextents || nr_exts > max_exts)
|
|
return -EFBIG;
|
|
|
|
return 0;
|
|
}
|