| /* |
| * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| * Copyright (c) 2013 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, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #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_alloc.h" |
| #include "xfs_attr_remote.h" |
| #include "xfs_trans.h" |
| #include "xfs_inode_item.h" |
| #include "xfs_bmap.h" |
| #include "xfs_attr.h" |
| #include "xfs_attr_leaf.h" |
| #include "xfs_error.h" |
| #include "xfs_quota.h" |
| #include "xfs_trace.h" |
| #include "xfs_dir2.h" |
| |
| /* |
| * Look at all the extents for this logical region, |
| * invalidate any buffers that are incore/in transactions. |
| */ |
| STATIC int |
| xfs_attr3_leaf_freextent( |
| struct xfs_trans **trans, |
| struct xfs_inode *dp, |
| xfs_dablk_t blkno, |
| int blkcnt) |
| { |
| struct xfs_bmbt_irec map; |
| struct xfs_buf *bp; |
| xfs_dablk_t tblkno; |
| xfs_daddr_t dblkno; |
| int tblkcnt; |
| int dblkcnt; |
| int nmap; |
| int error; |
| |
| /* |
| * Roll through the "value", invalidating the attribute value's |
| * blocks. |
| */ |
| tblkno = blkno; |
| tblkcnt = blkcnt; |
| while (tblkcnt > 0) { |
| /* |
| * Try to remember where we decided to put the value. |
| */ |
| nmap = 1; |
| error = xfs_bmapi_read(dp, (xfs_fileoff_t)tblkno, tblkcnt, |
| &map, &nmap, XFS_BMAPI_ATTRFORK); |
| if (error) { |
| return error; |
| } |
| ASSERT(nmap == 1); |
| ASSERT(map.br_startblock != DELAYSTARTBLOCK); |
| |
| /* |
| * If it's a hole, these are already unmapped |
| * so there's nothing to invalidate. |
| */ |
| if (map.br_startblock != HOLESTARTBLOCK) { |
| |
| dblkno = XFS_FSB_TO_DADDR(dp->i_mount, |
| map.br_startblock); |
| dblkcnt = XFS_FSB_TO_BB(dp->i_mount, |
| map.br_blockcount); |
| bp = xfs_trans_get_buf(*trans, |
| dp->i_mount->m_ddev_targp, |
| dblkno, dblkcnt, 0); |
| if (!bp) |
| return -ENOMEM; |
| xfs_trans_binval(*trans, bp); |
| /* |
| * Roll to next transaction. |
| */ |
| error = xfs_trans_roll(trans, dp); |
| if (error) |
| return error; |
| } |
| |
| tblkno += map.br_blockcount; |
| tblkcnt -= 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_attr_leafblock *leaf; |
| struct xfs_attr3_icleaf_hdr ichdr; |
| struct xfs_attr_leaf_entry *entry; |
| struct xfs_attr_leaf_name_remote *name_rmt; |
| struct xfs_attr_inactive_list *list; |
| struct xfs_attr_inactive_list *lp; |
| int error; |
| int count; |
| int size; |
| int tmp; |
| int i; |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| |
| leaf = bp->b_addr; |
| xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf); |
| |
| /* |
| * Count the number of "remote" value extents. |
| */ |
| count = 0; |
| entry = xfs_attr3_leaf_entryp(leaf); |
| for (i = 0; i < ichdr.count; entry++, i++) { |
| if (be16_to_cpu(entry->nameidx) && |
| ((entry->flags & XFS_ATTR_LOCAL) == 0)) { |
| name_rmt = xfs_attr3_leaf_name_remote(leaf, i); |
| if (name_rmt->valueblk) |
| count++; |
| } |
| } |
| |
| /* |
| * If there are no "remote" values, we're done. |
| */ |
| if (count == 0) { |
| xfs_trans_brelse(*trans, bp); |
| return 0; |
| } |
| |
| /* |
| * Allocate storage for a list of all the "remote" value extents. |
| */ |
| size = count * sizeof(xfs_attr_inactive_list_t); |
| list = kmem_alloc(size, KM_SLEEP); |
| |
| /* |
| * Identify each of the "remote" value extents. |
| */ |
| lp = list; |
| entry = xfs_attr3_leaf_entryp(leaf); |
| for (i = 0; i < ichdr.count; entry++, i++) { |
| if (be16_to_cpu(entry->nameidx) && |
| ((entry->flags & XFS_ATTR_LOCAL) == 0)) { |
| name_rmt = xfs_attr3_leaf_name_remote(leaf, i); |
| if (name_rmt->valueblk) { |
| lp->valueblk = be32_to_cpu(name_rmt->valueblk); |
| lp->valuelen = xfs_attr3_rmt_blocks(dp->i_mount, |
| be32_to_cpu(name_rmt->valuelen)); |
| lp++; |
| } |
| } |
| } |
| xfs_trans_brelse(*trans, bp); /* unlock for trans. in freextent() */ |
| |
| /* |
| * Invalidate each of the "remote" value extents. |
| */ |
| error = 0; |
| for (lp = list, i = 0; i < count; i++, lp++) { |
| tmp = xfs_attr3_leaf_freextent(trans, dp, |
| lp->valueblk, lp->valuelen); |
| |
| if (error == 0) |
| error = tmp; /* save only the 1st errno */ |
| } |
| |
| kmem_free(list); |
| 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) |
| { |
| xfs_da_blkinfo_t *info; |
| xfs_da_intnode_t *node; |
| xfs_dablk_t child_fsb; |
| xfs_daddr_t parent_blkno, child_blkno; |
| int error, i; |
| struct xfs_buf *child_bp; |
| struct xfs_da_node_entry *btree; |
| struct xfs_da3_icnode_hdr ichdr; |
| |
| /* |
| * Since this code is recursive (gasp!) we must protect ourselves. |
| */ |
| if (level > XFS_DA_NODE_MAXDEPTH) { |
| xfs_trans_brelse(*trans, bp); /* no locks for later trans */ |
| return -EIO; |
| } |
| |
| node = bp->b_addr; |
| dp->d_ops->node_hdr_from_disk(&ichdr, node); |
| parent_blkno = bp->b_bn; |
| if (!ichdr.count) { |
| xfs_trans_brelse(*trans, bp); |
| return 0; |
| } |
| btree = dp->d_ops->node_tree_p(node); |
| child_fsb = be32_to_cpu(btree[0].before); |
| xfs_trans_brelse(*trans, bp); /* no locks for later trans */ |
| |
| /* |
| * 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, -2, &child_bp, |
| XFS_ATTR_FORK); |
| if (error) |
| return error; |
| if (child_bp) { |
| /* save for re-read later */ |
| child_blkno = XFS_BUF_ADDR(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: |
| error = -EIO; |
| xfs_trans_brelse(*trans, child_bp); |
| break; |
| } |
| if (error) |
| return error; |
| |
| /* |
| * Remove the subsidiary block from the cache |
| * and from the log. |
| */ |
| error = xfs_da_get_buf(*trans, dp, 0, child_blkno, |
| &child_bp, XFS_ATTR_FORK); |
| if (error) |
| return error; |
| xfs_trans_binval(*trans, child_bp); |
| } |
| |
| /* |
| * If we're not done, re-read the parent to get the next |
| * child block number. |
| */ |
| if (i + 1 < ichdr.count) { |
| error = xfs_da3_node_read(*trans, dp, 0, parent_blkno, |
| &bp, XFS_ATTR_FORK); |
| if (error) |
| return error; |
| child_fsb = be32_to_cpu(btree[i + 1].before); |
| xfs_trans_brelse(*trans, bp); |
| } |
| /* |
| * Atomically commit the whole invalidate stuff. |
| */ |
| error = xfs_trans_roll(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. |
| */ |
| int |
| xfs_attr3_root_inactive( |
| struct xfs_trans **trans, |
| struct xfs_inode *dp) |
| { |
| 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, -1, &bp, XFS_ATTR_FORK); |
| if (error) |
| return error; |
| blkno = bp->b_bn; |
| |
| /* |
| * 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 = -EIO; |
| xfs_trans_brelse(*trans, bp); |
| break; |
| } |
| if (error) |
| return error; |
| |
| /* |
| * Invalidate the incore copy of the root block. |
| */ |
| error = xfs_da_get_buf(*trans, dp, 0, blkno, &bp, XFS_ATTR_FORK); |
| if (error) |
| return error; |
| xfs_trans_binval(*trans, bp); /* remove from cache */ |
| /* |
| * Commit the invalidate and start the next transaction. |
| */ |
| error = xfs_trans_roll(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 cancel_flags = 0; |
| 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_IFORK_Q(dp)) |
| goto out_destroy_fork; |
| xfs_iunlock(dp, lock_mode); |
| |
| /* |
| * Start our first transaction of the day. |
| * |
| * All future transactions during this code must be "chained" off |
| * this one via the trans_dup() call. All transactions will contain |
| * the inode, and the inode will always be marked with trans_ihold(). |
| * Since the inode will be locked in all transactions, we must log |
| * the inode in every transaction to let it float upward through |
| * the log. |
| */ |
| lock_mode = 0; |
| trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL); |
| error = xfs_trans_reserve(trans, &M_RES(mp)->tr_attrinval, 0, 0); |
| if (error) |
| goto out_cancel; |
| |
| lock_mode = XFS_ILOCK_EXCL; |
| cancel_flags = XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT; |
| xfs_ilock(dp, lock_mode); |
| |
| if (!XFS_IFORK_Q(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 attributes as otherwise the invalidation has no |
| * blocks to read and returns an error. In this case, just do the fork |
| * removal below. |
| */ |
| if (xfs_inode_hasattr(dp) && |
| dp->i_d.di_aformat != XFS_DINODE_FMT_LOCAL) { |
| 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_TRANS_RELEASE_LOG_RES); |
| xfs_iunlock(dp, lock_mode); |
| return error; |
| |
| out_cancel: |
| xfs_trans_cancel(trans, cancel_flags); |
| out_destroy_fork: |
| /* kill the in-core attr fork before we drop the inode lock */ |
| if (dp->i_afp) |
| xfs_idestroy_fork(dp, XFS_ATTR_FORK); |
| if (lock_mode) |
| xfs_iunlock(dp, lock_mode); |
| return error; |
| } |