From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- fs/xfs/xfs_attr_inactive.c | 392 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 392 insertions(+) create mode 100644 fs/xfs/xfs_attr_inactive.c (limited to 'fs/xfs/xfs_attr_inactive.c') diff --git a/fs/xfs/xfs_attr_inactive.c b/fs/xfs/xfs_attr_inactive.c new file mode 100644 index 000000000..5db87b34f --- /dev/null +++ b/fs/xfs/xfs_attr_inactive.c @@ -0,0 +1,392 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2000-2005 Silicon Graphics, Inc. + * Copyright (c) 2013 Red Hat, Inc. + * All Rights Reserved. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_bit.h" +#include "xfs_mount.h" +#include "xfs_da_format.h" +#include "xfs_da_btree.h" +#include "xfs_inode.h" +#include "xfs_attr.h" +#include "xfs_attr_remote.h" +#include "xfs_trans.h" +#include "xfs_bmap.h" +#include "xfs_attr_leaf.h" +#include "xfs_quota.h" +#include "xfs_dir2.h" +#include "xfs_error.h" + +/* + * Invalidate any incore buffers associated with this remote attribute value + * extent. We never log remote attribute value buffers, which means that they + * won't be attached to a transaction and are therefore safe to mark stale. + * The actual bunmapi will be taken care of later. + */ +STATIC int +xfs_attr3_rmt_stale( + struct xfs_inode *dp, + xfs_dablk_t blkno, + int blkcnt) +{ + struct xfs_bmbt_irec map; + int nmap; + int error; + + /* + * Roll through the "value", invalidating the attribute value's + * blocks. + */ + while (blkcnt > 0) { + /* + * Try to remember where we decided to put the value. + */ + nmap = 1; + error = xfs_bmapi_read(dp, (xfs_fileoff_t)blkno, blkcnt, + &map, &nmap, XFS_BMAPI_ATTRFORK); + if (error) + return error; + if (XFS_IS_CORRUPT(dp->i_mount, nmap != 1)) + return -EFSCORRUPTED; + + /* + * Mark any incore buffers for the remote value as stale. We + * never log remote attr value buffers, so the buffer should be + * easy to kill. + */ + error = xfs_attr_rmtval_stale(dp, &map, 0); + if (error) + return error; + + blkno += map.br_blockcount; + blkcnt -= map.br_blockcount; + } + + return 0; +} + +/* + * Invalidate all of the "remote" value regions pointed to by a particular + * leaf block. + * Note that we must release the lock on the buffer so that we are not + * caught holding something that the logging code wants to flush to disk. + */ +STATIC int +xfs_attr3_leaf_inactive( + struct xfs_trans **trans, + struct xfs_inode *dp, + struct xfs_buf *bp) +{ + struct xfs_attr3_icleaf_hdr ichdr; + struct xfs_mount *mp = bp->b_mount; + struct xfs_attr_leafblock *leaf = bp->b_addr; + struct xfs_attr_leaf_entry *entry; + struct xfs_attr_leaf_name_remote *name_rmt; + int error = 0; + int i; + + xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf); + + /* + * Find the remote value extents for this leaf and invalidate their + * incore buffers. + */ + entry = xfs_attr3_leaf_entryp(leaf); + for (i = 0; i < ichdr.count; entry++, i++) { + int blkcnt; + + if (!entry->nameidx || (entry->flags & XFS_ATTR_LOCAL)) + continue; + + name_rmt = xfs_attr3_leaf_name_remote(leaf, i); + if (!name_rmt->valueblk) + continue; + + blkcnt = xfs_attr3_rmt_blocks(dp->i_mount, + be32_to_cpu(name_rmt->valuelen)); + error = xfs_attr3_rmt_stale(dp, + be32_to_cpu(name_rmt->valueblk), blkcnt); + if (error) + goto err; + } + + xfs_trans_brelse(*trans, bp); +err: + return error; +} + +/* + * Recurse (gasp!) through the attribute nodes until we find leaves. + * We're doing a depth-first traversal in order to invalidate everything. + */ +STATIC int +xfs_attr3_node_inactive( + struct xfs_trans **trans, + struct xfs_inode *dp, + struct xfs_buf *bp, + int level) +{ + struct xfs_mount *mp = dp->i_mount; + struct xfs_da_blkinfo *info; + xfs_dablk_t child_fsb; + xfs_daddr_t parent_blkno, child_blkno; + struct xfs_buf *child_bp; + struct xfs_da3_icnode_hdr ichdr; + int error, i; + + /* + * Since this code is recursive (gasp!) we must protect ourselves. + */ + if (level > XFS_DA_NODE_MAXDEPTH) { + xfs_buf_mark_corrupt(bp); + xfs_trans_brelse(*trans, bp); /* no locks for later trans */ + return -EFSCORRUPTED; + } + + xfs_da3_node_hdr_from_disk(dp->i_mount, &ichdr, bp->b_addr); + parent_blkno = xfs_buf_daddr(bp); + if (!ichdr.count) { + xfs_trans_brelse(*trans, bp); + return 0; + } + child_fsb = be32_to_cpu(ichdr.btree[0].before); + xfs_trans_brelse(*trans, bp); /* no locks for later trans */ + bp = NULL; + + /* + * If this is the node level just above the leaves, simply loop + * over the leaves removing all of them. If this is higher up + * in the tree, recurse downward. + */ + for (i = 0; i < ichdr.count; i++) { + /* + * Read the subsidiary block to see what we have to work with. + * Don't do this in a transaction. This is a depth-first + * traversal of the tree so we may deal with many blocks + * before we come back to this one. + */ + error = xfs_da3_node_read(*trans, dp, child_fsb, &child_bp, + XFS_ATTR_FORK); + if (error) + return error; + + /* save for re-read later */ + child_blkno = xfs_buf_daddr(child_bp); + + /* + * Invalidate the subtree, however we have to. + */ + info = child_bp->b_addr; + switch (info->magic) { + case cpu_to_be16(XFS_DA_NODE_MAGIC): + case cpu_to_be16(XFS_DA3_NODE_MAGIC): + error = xfs_attr3_node_inactive(trans, dp, child_bp, + level + 1); + break; + case cpu_to_be16(XFS_ATTR_LEAF_MAGIC): + case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC): + error = xfs_attr3_leaf_inactive(trans, dp, child_bp); + break; + default: + xfs_buf_mark_corrupt(child_bp); + xfs_trans_brelse(*trans, child_bp); + error = -EFSCORRUPTED; + break; + } + if (error) + return error; + + /* + * Remove the subsidiary block from the cache and from the log. + */ + error = xfs_trans_get_buf(*trans, mp->m_ddev_targp, + child_blkno, + XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0, + &child_bp); + if (error) + return error; + xfs_trans_binval(*trans, child_bp); + child_bp = NULL; + + /* + * If we're not done, re-read the parent to get the next + * child block number. + */ + if (i + 1 < ichdr.count) { + struct xfs_da3_icnode_hdr phdr; + + error = xfs_da3_node_read_mapped(*trans, dp, + parent_blkno, &bp, XFS_ATTR_FORK); + if (error) + return error; + xfs_da3_node_hdr_from_disk(dp->i_mount, &phdr, + bp->b_addr); + child_fsb = be32_to_cpu(phdr.btree[i + 1].before); + xfs_trans_brelse(*trans, bp); + bp = NULL; + } + /* + * Atomically commit the whole invalidate stuff. + */ + error = xfs_trans_roll_inode(trans, dp); + if (error) + return error; + } + + return 0; +} + +/* + * Indiscriminately delete the entire attribute fork + * + * Recurse (gasp!) through the attribute nodes until we find leaves. + * We're doing a depth-first traversal in order to invalidate everything. + */ +static int +xfs_attr3_root_inactive( + struct xfs_trans **trans, + struct xfs_inode *dp) +{ + struct xfs_mount *mp = dp->i_mount; + struct xfs_da_blkinfo *info; + struct xfs_buf *bp; + xfs_daddr_t blkno; + int error; + + /* + * Read block 0 to see what we have to work with. + * We only get here if we have extents, since we remove + * the extents in reverse order the extent containing + * block 0 must still be there. + */ + error = xfs_da3_node_read(*trans, dp, 0, &bp, XFS_ATTR_FORK); + if (error) + return error; + blkno = xfs_buf_daddr(bp); + + /* + * Invalidate the tree, even if the "tree" is only a single leaf block. + * This is a depth-first traversal! + */ + info = bp->b_addr; + switch (info->magic) { + case cpu_to_be16(XFS_DA_NODE_MAGIC): + case cpu_to_be16(XFS_DA3_NODE_MAGIC): + error = xfs_attr3_node_inactive(trans, dp, bp, 1); + break; + case cpu_to_be16(XFS_ATTR_LEAF_MAGIC): + case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC): + error = xfs_attr3_leaf_inactive(trans, dp, bp); + break; + default: + error = -EFSCORRUPTED; + xfs_buf_mark_corrupt(bp); + xfs_trans_brelse(*trans, bp); + break; + } + if (error) + return error; + + /* + * Invalidate the incore copy of the root block. + */ + error = xfs_trans_get_buf(*trans, mp->m_ddev_targp, blkno, + XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0, &bp); + if (error) + return error; + error = bp->b_error; + if (error) { + xfs_trans_brelse(*trans, bp); + return error; + } + xfs_trans_binval(*trans, bp); /* remove from cache */ + /* + * Commit the invalidate and start the next transaction. + */ + error = xfs_trans_roll_inode(trans, dp); + + return error; +} + +/* + * xfs_attr_inactive kills all traces of an attribute fork on an inode. It + * removes both the on-disk and in-memory inode fork. Note that this also has to + * handle the condition of inodes without attributes but with an attribute fork + * configured, so we can't use xfs_inode_hasattr() here. + * + * The in-memory attribute fork is removed even on error. + */ +int +xfs_attr_inactive( + struct xfs_inode *dp) +{ + struct xfs_trans *trans; + struct xfs_mount *mp; + int lock_mode = XFS_ILOCK_SHARED; + int error = 0; + + mp = dp->i_mount; + ASSERT(! XFS_NOT_DQATTACHED(mp, dp)); + + xfs_ilock(dp, lock_mode); + if (!xfs_inode_has_attr_fork(dp)) + goto out_destroy_fork; + xfs_iunlock(dp, lock_mode); + + lock_mode = 0; + + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_attrinval, 0, 0, 0, &trans); + if (error) + goto out_destroy_fork; + + lock_mode = XFS_ILOCK_EXCL; + xfs_ilock(dp, lock_mode); + + if (!xfs_inode_has_attr_fork(dp)) + goto out_cancel; + + /* + * No need to make quota reservations here. We expect to release some + * blocks, not allocate, in the common case. + */ + xfs_trans_ijoin(trans, dp, 0); + + /* + * Invalidate and truncate the attribute fork extents. Make sure the + * fork actually has xattr blocks as otherwise the invalidation has no + * blocks to read and returns an error. In this case, just do the fork + * removal below. + */ + if (dp->i_af.if_nextents > 0) { + error = xfs_attr3_root_inactive(&trans, dp); + if (error) + goto out_cancel; + + error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0); + if (error) + goto out_cancel; + } + + /* Reset the attribute fork - this also destroys the in-core fork */ + xfs_attr_fork_remove(dp, trans); + + error = xfs_trans_commit(trans); + xfs_iunlock(dp, lock_mode); + return error; + +out_cancel: + xfs_trans_cancel(trans); +out_destroy_fork: + /* kill the in-core attr fork before we drop the inode lock */ + xfs_ifork_zap_attr(dp); + if (lock_mode) + xfs_iunlock(dp, lock_mode); + return error; +} -- cgit v1.2.3