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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (c) 2000-2005 Silicon Graphics, 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_mount.h"
- #include "xfs_defer.h"
- #include "xfs_da_format.h"
- #include "xfs_da_btree.h"
- #include "xfs_attr_sf.h"
- #include "xfs_inode.h"
- #include "xfs_trans.h"
- #include "xfs_bmap.h"
- #include "xfs_bmap_btree.h"
- #include "xfs_attr.h"
- #include "xfs_attr_leaf.h"
- #include "xfs_attr_remote.h"
- #include "xfs_quota.h"
- #include "xfs_trans_space.h"
- #include "xfs_trace.h"
- #include "xfs_attr_item.h"
- #include "xfs_xattr.h"
- struct kmem_cache *xfs_attr_intent_cache;
- /*
- * xfs_attr.c
- *
- * Provide the external interfaces to manage attribute lists.
- */
- /*========================================================================
- * Function prototypes for the kernel.
- *========================================================================*/
- /*
- * Internal routines when attribute list fits inside the inode.
- */
- STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
- /*
- * Internal routines when attribute list is one block.
- */
- STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
- STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
- STATIC int xfs_attr_leaf_hasname(struct xfs_da_args *args, struct xfs_buf **bp);
- STATIC int xfs_attr_leaf_try_add(struct xfs_da_args *args);
- /*
- * Internal routines when attribute list is more than one block.
- */
- STATIC int xfs_attr_node_get(xfs_da_args_t *args);
- STATIC void xfs_attr_restore_rmt_blk(struct xfs_da_args *args);
- static int xfs_attr_node_try_addname(struct xfs_attr_intent *attr);
- STATIC int xfs_attr_node_addname_find_attr(struct xfs_attr_intent *attr);
- STATIC int xfs_attr_node_remove_attr(struct xfs_attr_intent *attr);
- STATIC int xfs_attr_node_lookup(struct xfs_da_args *args,
- struct xfs_da_state *state);
- int
- xfs_inode_hasattr(
- struct xfs_inode *ip)
- {
- if (!xfs_inode_has_attr_fork(ip))
- return 0;
- if (ip->i_af.if_format == XFS_DINODE_FMT_EXTENTS &&
- ip->i_af.if_nextents == 0)
- return 0;
- return 1;
- }
- /*
- * Returns true if the there is exactly only block in the attr fork, in which
- * case the attribute fork consists of a single leaf block entry.
- */
- bool
- xfs_attr_is_leaf(
- struct xfs_inode *ip)
- {
- struct xfs_ifork *ifp = &ip->i_af;
- struct xfs_iext_cursor icur;
- struct xfs_bmbt_irec imap;
- if (ifp->if_nextents != 1 || ifp->if_format != XFS_DINODE_FMT_EXTENTS)
- return false;
- xfs_iext_first(ifp, &icur);
- xfs_iext_get_extent(ifp, &icur, &imap);
- return imap.br_startoff == 0 && imap.br_blockcount == 1;
- }
- /*
- * XXX (dchinner): name path state saving and refilling is an optimisation to
- * avoid needing to look up name entries after rolling transactions removing
- * remote xattr blocks between the name entry lookup and name entry removal.
- * This optimisation got sidelined when combining the set and remove state
- * machines, but the code has been left in place because it is worthwhile to
- * restore the optimisation once the combined state machine paths have settled.
- *
- * This comment is a public service announcement to remind Future Dave that he
- * still needs to restore this code to working order.
- */
- #if 0
- /*
- * Fill in the disk block numbers in the state structure for the buffers
- * that are attached to the state structure.
- * This is done so that we can quickly reattach ourselves to those buffers
- * after some set of transaction commits have released these buffers.
- */
- static int
- xfs_attr_fillstate(xfs_da_state_t *state)
- {
- xfs_da_state_path_t *path;
- xfs_da_state_blk_t *blk;
- int level;
- trace_xfs_attr_fillstate(state->args);
- /*
- * Roll down the "path" in the state structure, storing the on-disk
- * block number for those buffers in the "path".
- */
- path = &state->path;
- ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
- for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
- if (blk->bp) {
- blk->disk_blkno = xfs_buf_daddr(blk->bp);
- blk->bp = NULL;
- } else {
- blk->disk_blkno = 0;
- }
- }
- /*
- * Roll down the "altpath" in the state structure, storing the on-disk
- * block number for those buffers in the "altpath".
- */
- path = &state->altpath;
- ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
- for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
- if (blk->bp) {
- blk->disk_blkno = xfs_buf_daddr(blk->bp);
- blk->bp = NULL;
- } else {
- blk->disk_blkno = 0;
- }
- }
- return 0;
- }
- /*
- * Reattach the buffers to the state structure based on the disk block
- * numbers stored in the state structure.
- * This is done after some set of transaction commits have released those
- * buffers from our grip.
- */
- static int
- xfs_attr_refillstate(xfs_da_state_t *state)
- {
- xfs_da_state_path_t *path;
- xfs_da_state_blk_t *blk;
- int level, error;
- trace_xfs_attr_refillstate(state->args);
- /*
- * Roll down the "path" in the state structure, storing the on-disk
- * block number for those buffers in the "path".
- */
- path = &state->path;
- ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
- for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
- if (blk->disk_blkno) {
- error = xfs_da3_node_read_mapped(state->args->trans,
- state->args->dp, blk->disk_blkno,
- &blk->bp, XFS_ATTR_FORK);
- if (error)
- return error;
- } else {
- blk->bp = NULL;
- }
- }
- /*
- * Roll down the "altpath" in the state structure, storing the on-disk
- * block number for those buffers in the "altpath".
- */
- path = &state->altpath;
- ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
- for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
- if (blk->disk_blkno) {
- error = xfs_da3_node_read_mapped(state->args->trans,
- state->args->dp, blk->disk_blkno,
- &blk->bp, XFS_ATTR_FORK);
- if (error)
- return error;
- } else {
- blk->bp = NULL;
- }
- }
- return 0;
- }
- #else
- static int xfs_attr_fillstate(xfs_da_state_t *state) { return 0; }
- #endif
- /*========================================================================
- * Overall external interface routines.
- *========================================================================*/
- /*
- * Retrieve an extended attribute and its value. Must have ilock.
- * Returns 0 on successful retrieval, otherwise an error.
- */
- int
- xfs_attr_get_ilocked(
- struct xfs_da_args *args)
- {
- ASSERT(xfs_isilocked(args->dp, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- if (!xfs_inode_hasattr(args->dp))
- return -ENOATTR;
- if (args->dp->i_af.if_format == XFS_DINODE_FMT_LOCAL)
- return xfs_attr_shortform_getvalue(args);
- if (xfs_attr_is_leaf(args->dp))
- return xfs_attr_leaf_get(args);
- return xfs_attr_node_get(args);
- }
- /*
- * Retrieve an extended attribute by name, and its value if requested.
- *
- * If args->valuelen is zero, then the caller does not want the value, just an
- * indication whether the attribute exists and the size of the value if it
- * exists. The size is returned in args.valuelen.
- *
- * If args->value is NULL but args->valuelen is non-zero, allocate the buffer
- * for the value after existence of the attribute has been determined. The
- * caller always has to free args->value if it is set, no matter if this
- * function was successful or not.
- *
- * If the attribute is found, but exceeds the size limit set by the caller in
- * args->valuelen, return -ERANGE with the size of the attribute that was found
- * in args->valuelen.
- */
- int
- xfs_attr_get(
- struct xfs_da_args *args)
- {
- uint lock_mode;
- int error;
- XFS_STATS_INC(args->dp->i_mount, xs_attr_get);
- if (xfs_is_shutdown(args->dp->i_mount))
- return -EIO;
- args->geo = args->dp->i_mount->m_attr_geo;
- args->whichfork = XFS_ATTR_FORK;
- args->hashval = xfs_da_hashname(args->name, args->namelen);
- /* Entirely possible to look up a name which doesn't exist */
- args->op_flags = XFS_DA_OP_OKNOENT;
- lock_mode = xfs_ilock_attr_map_shared(args->dp);
- error = xfs_attr_get_ilocked(args);
- xfs_iunlock(args->dp, lock_mode);
- return error;
- }
- /*
- * Calculate how many blocks we need for the new attribute,
- */
- int
- xfs_attr_calc_size(
- struct xfs_da_args *args,
- int *local)
- {
- struct xfs_mount *mp = args->dp->i_mount;
- int size;
- int nblks;
- /*
- * Determine space new attribute will use, and if it would be
- * "local" or "remote" (note: local != inline).
- */
- size = xfs_attr_leaf_newentsize(args, local);
- nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
- if (*local) {
- if (size > (args->geo->blksize / 2)) {
- /* Double split possible */
- nblks *= 2;
- }
- } else {
- /*
- * Out of line attribute, cannot double split, but
- * make room for the attribute value itself.
- */
- uint dblocks = xfs_attr3_rmt_blocks(mp, args->valuelen);
- nblks += dblocks;
- nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
- }
- return nblks;
- }
- /* Initialize transaction reservation for attr operations */
- void
- xfs_init_attr_trans(
- struct xfs_da_args *args,
- struct xfs_trans_res *tres,
- unsigned int *total)
- {
- struct xfs_mount *mp = args->dp->i_mount;
- if (args->value) {
- tres->tr_logres = M_RES(mp)->tr_attrsetm.tr_logres +
- M_RES(mp)->tr_attrsetrt.tr_logres *
- args->total;
- tres->tr_logcount = XFS_ATTRSET_LOG_COUNT;
- tres->tr_logflags = XFS_TRANS_PERM_LOG_RES;
- *total = args->total;
- } else {
- *tres = M_RES(mp)->tr_attrrm;
- *total = XFS_ATTRRM_SPACE_RES(mp);
- }
- }
- /*
- * Add an attr to a shortform fork. If there is no space,
- * xfs_attr_shortform_addname() will convert to leaf format and return -ENOSPC.
- * to use.
- */
- STATIC int
- xfs_attr_try_sf_addname(
- struct xfs_inode *dp,
- struct xfs_da_args *args)
- {
- int error;
- /*
- * Build initial attribute list (if required).
- */
- if (dp->i_af.if_format == XFS_DINODE_FMT_EXTENTS)
- xfs_attr_shortform_create(args);
- error = xfs_attr_shortform_addname(args);
- if (error == -ENOSPC)
- return error;
- /*
- * Commit the shortform mods, and we're done.
- * NOTE: this is also the error path (EEXIST, etc).
- */
- if (!error && !(args->op_flags & XFS_DA_OP_NOTIME))
- xfs_trans_ichgtime(args->trans, dp, XFS_ICHGTIME_CHG);
- if (xfs_has_wsync(dp->i_mount))
- xfs_trans_set_sync(args->trans);
- return error;
- }
- static int
- xfs_attr_sf_addname(
- struct xfs_attr_intent *attr)
- {
- struct xfs_da_args *args = attr->xattri_da_args;
- struct xfs_inode *dp = args->dp;
- int error = 0;
- error = xfs_attr_try_sf_addname(dp, args);
- if (error != -ENOSPC) {
- ASSERT(!error || error == -EEXIST);
- attr->xattri_dela_state = XFS_DAS_DONE;
- goto out;
- }
- /*
- * It won't fit in the shortform, transform to a leaf block. GROT:
- * another possible req'mt for a double-split btree op.
- */
- error = xfs_attr_shortform_to_leaf(args);
- if (error)
- return error;
- attr->xattri_dela_state = XFS_DAS_LEAF_ADD;
- out:
- trace_xfs_attr_sf_addname_return(attr->xattri_dela_state, args->dp);
- return error;
- }
- /*
- * Handle the state change on completion of a multi-state attr operation.
- *
- * If the XFS_DA_OP_REPLACE flag is set, this means the operation was the first
- * modification in a attr replace operation and we still have to do the second
- * state, indicated by @replace_state.
- *
- * We consume the XFS_DA_OP_REPLACE flag so that when we are called again on
- * completion of the second half of the attr replace operation we correctly
- * signal that it is done.
- */
- static enum xfs_delattr_state
- xfs_attr_complete_op(
- struct xfs_attr_intent *attr,
- enum xfs_delattr_state replace_state)
- {
- struct xfs_da_args *args = attr->xattri_da_args;
- bool do_replace = args->op_flags & XFS_DA_OP_REPLACE;
- args->op_flags &= ~XFS_DA_OP_REPLACE;
- if (do_replace) {
- args->attr_filter &= ~XFS_ATTR_INCOMPLETE;
- return replace_state;
- }
- return XFS_DAS_DONE;
- }
- static int
- xfs_attr_leaf_addname(
- struct xfs_attr_intent *attr)
- {
- struct xfs_da_args *args = attr->xattri_da_args;
- int error;
- ASSERT(xfs_attr_is_leaf(args->dp));
- /*
- * Use the leaf buffer we may already hold locked as a result of
- * a sf-to-leaf conversion.
- */
- error = xfs_attr_leaf_try_add(args);
- if (error == -ENOSPC) {
- error = xfs_attr3_leaf_to_node(args);
- if (error)
- return error;
- /*
- * We're not in leaf format anymore, so roll the transaction and
- * retry the add to the newly allocated node block.
- */
- attr->xattri_dela_state = XFS_DAS_NODE_ADD;
- goto out;
- }
- if (error)
- return error;
- /*
- * We need to commit and roll if we need to allocate remote xattr blocks
- * or perform more xattr manipulations. Otherwise there is nothing more
- * to do and we can return success.
- */
- if (args->rmtblkno)
- attr->xattri_dela_state = XFS_DAS_LEAF_SET_RMT;
- else
- attr->xattri_dela_state = xfs_attr_complete_op(attr,
- XFS_DAS_LEAF_REPLACE);
- out:
- trace_xfs_attr_leaf_addname_return(attr->xattri_dela_state, args->dp);
- return error;
- }
- /*
- * Add an entry to a node format attr tree.
- *
- * Note that we might still have a leaf here - xfs_attr_is_leaf() cannot tell
- * the difference between leaf + remote attr blocks and a node format tree,
- * so we may still end up having to convert from leaf to node format here.
- */
- static int
- xfs_attr_node_addname(
- struct xfs_attr_intent *attr)
- {
- struct xfs_da_args *args = attr->xattri_da_args;
- int error;
- error = xfs_attr_node_addname_find_attr(attr);
- if (error)
- return error;
- error = xfs_attr_node_try_addname(attr);
- if (error == -ENOSPC) {
- error = xfs_attr3_leaf_to_node(args);
- if (error)
- return error;
- /*
- * No state change, we really are in node form now
- * but we need the transaction rolled to continue.
- */
- goto out;
- }
- if (error)
- return error;
- if (args->rmtblkno)
- attr->xattri_dela_state = XFS_DAS_NODE_SET_RMT;
- else
- attr->xattri_dela_state = xfs_attr_complete_op(attr,
- XFS_DAS_NODE_REPLACE);
- out:
- trace_xfs_attr_node_addname_return(attr->xattri_dela_state, args->dp);
- return error;
- }
- static int
- xfs_attr_rmtval_alloc(
- struct xfs_attr_intent *attr)
- {
- struct xfs_da_args *args = attr->xattri_da_args;
- int error = 0;
- /*
- * If there was an out-of-line value, allocate the blocks we
- * identified for its storage and copy the value. This is done
- * after we create the attribute so that we don't overflow the
- * maximum size of a transaction and/or hit a deadlock.
- */
- if (attr->xattri_blkcnt > 0) {
- error = xfs_attr_rmtval_set_blk(attr);
- if (error)
- return error;
- /* Roll the transaction only if there is more to allocate. */
- if (attr->xattri_blkcnt > 0)
- goto out;
- }
- error = xfs_attr_rmtval_set_value(args);
- if (error)
- return error;
- attr->xattri_dela_state = xfs_attr_complete_op(attr,
- ++attr->xattri_dela_state);
- /*
- * If we are not doing a rename, we've finished the operation but still
- * have to clear the incomplete flag protecting the new attr from
- * exposing partially initialised state if we crash during creation.
- */
- if (attr->xattri_dela_state == XFS_DAS_DONE)
- error = xfs_attr3_leaf_clearflag(args);
- out:
- trace_xfs_attr_rmtval_alloc(attr->xattri_dela_state, args->dp);
- return error;
- }
- /*
- * Mark an attribute entry INCOMPLETE and save pointers to the relevant buffers
- * for later deletion of the entry.
- */
- static int
- xfs_attr_leaf_mark_incomplete(
- struct xfs_da_args *args,
- struct xfs_da_state *state)
- {
- int error;
- /*
- * Fill in disk block numbers in the state structure
- * so that we can get the buffers back after we commit
- * several transactions in the following calls.
- */
- error = xfs_attr_fillstate(state);
- if (error)
- return error;
- /*
- * Mark the attribute as INCOMPLETE
- */
- return xfs_attr3_leaf_setflag(args);
- }
- /* Ensure the da state of an xattr deferred work item is ready to go. */
- static inline void
- xfs_attr_item_init_da_state(
- struct xfs_attr_intent *attr)
- {
- struct xfs_da_args *args = attr->xattri_da_args;
- if (!attr->xattri_da_state)
- attr->xattri_da_state = xfs_da_state_alloc(args);
- else
- xfs_da_state_reset(attr->xattri_da_state, args);
- }
- /*
- * Initial setup for xfs_attr_node_removename. Make sure the attr is there and
- * the blocks are valid. Attr keys with remote blocks will be marked
- * incomplete.
- */
- static
- int xfs_attr_node_removename_setup(
- struct xfs_attr_intent *attr)
- {
- struct xfs_da_args *args = attr->xattri_da_args;
- struct xfs_da_state *state;
- int error;
- xfs_attr_item_init_da_state(attr);
- error = xfs_attr_node_lookup(args, attr->xattri_da_state);
- if (error != -EEXIST)
- goto out;
- error = 0;
- state = attr->xattri_da_state;
- ASSERT(state->path.blk[state->path.active - 1].bp != NULL);
- ASSERT(state->path.blk[state->path.active - 1].magic ==
- XFS_ATTR_LEAF_MAGIC);
- error = xfs_attr_leaf_mark_incomplete(args, state);
- if (error)
- goto out;
- if (args->rmtblkno > 0)
- error = xfs_attr_rmtval_invalidate(args);
- out:
- if (error) {
- xfs_da_state_free(attr->xattri_da_state);
- attr->xattri_da_state = NULL;
- }
- return error;
- }
- /*
- * Remove the original attr we have just replaced. This is dependent on the
- * original lookup and insert placing the old attr in args->blkno/args->index
- * and the new attr in args->blkno2/args->index2.
- */
- static int
- xfs_attr_leaf_remove_attr(
- struct xfs_attr_intent *attr)
- {
- struct xfs_da_args *args = attr->xattri_da_args;
- struct xfs_inode *dp = args->dp;
- struct xfs_buf *bp = NULL;
- int forkoff;
- int error;
- error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno,
- &bp);
- if (error)
- return error;
- xfs_attr3_leaf_remove(bp, args);
- forkoff = xfs_attr_shortform_allfit(bp, dp);
- if (forkoff)
- error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
- /* bp is gone due to xfs_da_shrink_inode */
- return error;
- }
- /*
- * Shrink an attribute from leaf to shortform. Used by the node format remove
- * path when the node format collapses to a single block and so we have to check
- * if it can be collapsed further.
- */
- static int
- xfs_attr_leaf_shrink(
- struct xfs_da_args *args)
- {
- struct xfs_inode *dp = args->dp;
- struct xfs_buf *bp;
- int forkoff;
- int error;
- if (!xfs_attr_is_leaf(dp))
- return 0;
- error = xfs_attr3_leaf_read(args->trans, args->dp, 0, &bp);
- if (error)
- return error;
- forkoff = xfs_attr_shortform_allfit(bp, dp);
- if (forkoff) {
- error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
- /* bp is gone due to xfs_da_shrink_inode */
- } else {
- xfs_trans_brelse(args->trans, bp);
- }
- return error;
- }
- /*
- * Run the attribute operation specified in @attr.
- *
- * This routine is meant to function as a delayed operation and will set the
- * state to XFS_DAS_DONE when the operation is complete. Calling functions will
- * need to handle this, and recall the function until either an error or
- * XFS_DAS_DONE is detected.
- */
- int
- xfs_attr_set_iter(
- struct xfs_attr_intent *attr)
- {
- struct xfs_da_args *args = attr->xattri_da_args;
- int error = 0;
- /* State machine switch */
- next_state:
- switch (attr->xattri_dela_state) {
- case XFS_DAS_UNINIT:
- ASSERT(0);
- return -EFSCORRUPTED;
- case XFS_DAS_SF_ADD:
- return xfs_attr_sf_addname(attr);
- case XFS_DAS_LEAF_ADD:
- return xfs_attr_leaf_addname(attr);
- case XFS_DAS_NODE_ADD:
- return xfs_attr_node_addname(attr);
- case XFS_DAS_SF_REMOVE:
- error = xfs_attr_sf_removename(args);
- attr->xattri_dela_state = xfs_attr_complete_op(attr,
- xfs_attr_init_add_state(args));
- break;
- case XFS_DAS_LEAF_REMOVE:
- error = xfs_attr_leaf_removename(args);
- attr->xattri_dela_state = xfs_attr_complete_op(attr,
- xfs_attr_init_add_state(args));
- break;
- case XFS_DAS_NODE_REMOVE:
- error = xfs_attr_node_removename_setup(attr);
- if (error == -ENOATTR &&
- (args->op_flags & XFS_DA_OP_RECOVERY)) {
- attr->xattri_dela_state = xfs_attr_complete_op(attr,
- xfs_attr_init_add_state(args));
- error = 0;
- break;
- }
- if (error)
- return error;
- attr->xattri_dela_state = XFS_DAS_NODE_REMOVE_RMT;
- if (args->rmtblkno == 0)
- attr->xattri_dela_state++;
- break;
- case XFS_DAS_LEAF_SET_RMT:
- case XFS_DAS_NODE_SET_RMT:
- error = xfs_attr_rmtval_find_space(attr);
- if (error)
- return error;
- attr->xattri_dela_state++;
- fallthrough;
- case XFS_DAS_LEAF_ALLOC_RMT:
- case XFS_DAS_NODE_ALLOC_RMT:
- error = xfs_attr_rmtval_alloc(attr);
- if (error)
- return error;
- if (attr->xattri_dela_state == XFS_DAS_DONE)
- break;
- goto next_state;
- case XFS_DAS_LEAF_REPLACE:
- case XFS_DAS_NODE_REPLACE:
- /*
- * We must "flip" the incomplete flags on the "new" and "old"
- * attribute/value pairs so that one disappears and one appears
- * atomically.
- */
- error = xfs_attr3_leaf_flipflags(args);
- if (error)
- return error;
- /*
- * We must commit the flag value change now to make it atomic
- * and then we can start the next trans in series at REMOVE_OLD.
- */
- attr->xattri_dela_state++;
- break;
- case XFS_DAS_LEAF_REMOVE_OLD:
- case XFS_DAS_NODE_REMOVE_OLD:
- /*
- * If we have a remote attr, start the process of removing it
- * by invalidating any cached buffers.
- *
- * If we don't have a remote attr, we skip the remote block
- * removal state altogether with a second state increment.
- */
- xfs_attr_restore_rmt_blk(args);
- if (args->rmtblkno) {
- error = xfs_attr_rmtval_invalidate(args);
- if (error)
- return error;
- } else {
- attr->xattri_dela_state++;
- }
- attr->xattri_dela_state++;
- goto next_state;
- case XFS_DAS_LEAF_REMOVE_RMT:
- case XFS_DAS_NODE_REMOVE_RMT:
- error = xfs_attr_rmtval_remove(attr);
- if (error == -EAGAIN) {
- error = 0;
- break;
- }
- if (error)
- return error;
- /*
- * We've finished removing the remote attr blocks, so commit the
- * transaction and move on to removing the attr name from the
- * leaf/node block. Removing the attr might require a full
- * transaction reservation for btree block freeing, so we
- * can't do that in the same transaction where we removed the
- * remote attr blocks.
- */
- attr->xattri_dela_state++;
- break;
- case XFS_DAS_LEAF_REMOVE_ATTR:
- error = xfs_attr_leaf_remove_attr(attr);
- attr->xattri_dela_state = xfs_attr_complete_op(attr,
- xfs_attr_init_add_state(args));
- break;
- case XFS_DAS_NODE_REMOVE_ATTR:
- error = xfs_attr_node_remove_attr(attr);
- if (!error)
- error = xfs_attr_leaf_shrink(args);
- attr->xattri_dela_state = xfs_attr_complete_op(attr,
- xfs_attr_init_add_state(args));
- break;
- default:
- ASSERT(0);
- break;
- }
- trace_xfs_attr_set_iter_return(attr->xattri_dela_state, args->dp);
- return error;
- }
- /*
- * Return EEXIST if attr is found, or ENOATTR if not
- */
- static int
- xfs_attr_lookup(
- struct xfs_da_args *args)
- {
- struct xfs_inode *dp = args->dp;
- struct xfs_buf *bp = NULL;
- struct xfs_da_state *state;
- int error;
- if (!xfs_inode_hasattr(dp))
- return -ENOATTR;
- if (dp->i_af.if_format == XFS_DINODE_FMT_LOCAL)
- return xfs_attr_sf_findname(args, NULL, NULL);
- if (xfs_attr_is_leaf(dp)) {
- error = xfs_attr_leaf_hasname(args, &bp);
- if (bp)
- xfs_trans_brelse(args->trans, bp);
- return error;
- }
- state = xfs_da_state_alloc(args);
- error = xfs_attr_node_lookup(args, state);
- xfs_da_state_free(state);
- return error;
- }
- static int
- xfs_attr_intent_init(
- struct xfs_da_args *args,
- unsigned int op_flags, /* op flag (set or remove) */
- struct xfs_attr_intent **attr) /* new xfs_attr_intent */
- {
- struct xfs_attr_intent *new;
- new = kmem_cache_zalloc(xfs_attr_intent_cache, GFP_NOFS | __GFP_NOFAIL);
- new->xattri_op_flags = op_flags;
- new->xattri_da_args = args;
- *attr = new;
- return 0;
- }
- /* Sets an attribute for an inode as a deferred operation */
- static int
- xfs_attr_defer_add(
- struct xfs_da_args *args)
- {
- struct xfs_attr_intent *new;
- int error = 0;
- error = xfs_attr_intent_init(args, XFS_ATTRI_OP_FLAGS_SET, &new);
- if (error)
- return error;
- new->xattri_dela_state = xfs_attr_init_add_state(args);
- xfs_defer_add(args->trans, XFS_DEFER_OPS_TYPE_ATTR, &new->xattri_list);
- trace_xfs_attr_defer_add(new->xattri_dela_state, args->dp);
- return 0;
- }
- /* Sets an attribute for an inode as a deferred operation */
- static int
- xfs_attr_defer_replace(
- struct xfs_da_args *args)
- {
- struct xfs_attr_intent *new;
- int error = 0;
- error = xfs_attr_intent_init(args, XFS_ATTRI_OP_FLAGS_REPLACE, &new);
- if (error)
- return error;
- new->xattri_dela_state = xfs_attr_init_replace_state(args);
- xfs_defer_add(args->trans, XFS_DEFER_OPS_TYPE_ATTR, &new->xattri_list);
- trace_xfs_attr_defer_replace(new->xattri_dela_state, args->dp);
- return 0;
- }
- /* Removes an attribute for an inode as a deferred operation */
- static int
- xfs_attr_defer_remove(
- struct xfs_da_args *args)
- {
- struct xfs_attr_intent *new;
- int error;
- error = xfs_attr_intent_init(args, XFS_ATTRI_OP_FLAGS_REMOVE, &new);
- if (error)
- return error;
- new->xattri_dela_state = xfs_attr_init_remove_state(args);
- xfs_defer_add(args->trans, XFS_DEFER_OPS_TYPE_ATTR, &new->xattri_list);
- trace_xfs_attr_defer_remove(new->xattri_dela_state, args->dp);
- return 0;
- }
- /*
- * Note: If args->value is NULL the attribute will be removed, just like the
- * Linux ->setattr API.
- */
- int
- xfs_attr_set(
- struct xfs_da_args *args)
- {
- struct xfs_inode *dp = args->dp;
- struct xfs_mount *mp = dp->i_mount;
- struct xfs_trans_res tres;
- bool rsvd = (args->attr_filter & XFS_ATTR_ROOT);
- int error, local;
- int rmt_blks = 0;
- unsigned int total;
- if (xfs_is_shutdown(dp->i_mount))
- return -EIO;
- error = xfs_qm_dqattach(dp);
- if (error)
- return error;
- args->geo = mp->m_attr_geo;
- args->whichfork = XFS_ATTR_FORK;
- args->hashval = xfs_da_hashname(args->name, args->namelen);
- /*
- * We have no control over the attribute names that userspace passes us
- * to remove, so we have to allow the name lookup prior to attribute
- * removal to fail as well. Preserve the logged flag, since we need
- * to pass that through to the logging code.
- */
- args->op_flags = XFS_DA_OP_OKNOENT |
- (args->op_flags & XFS_DA_OP_LOGGED);
- if (args->value) {
- XFS_STATS_INC(mp, xs_attr_set);
- args->total = xfs_attr_calc_size(args, &local);
- /*
- * If the inode doesn't have an attribute fork, add one.
- * (inode must not be locked when we call this routine)
- */
- if (xfs_inode_has_attr_fork(dp) == 0) {
- int sf_size = sizeof(struct xfs_attr_sf_hdr) +
- xfs_attr_sf_entsize_byname(args->namelen,
- args->valuelen);
- error = xfs_bmap_add_attrfork(dp, sf_size, rsvd);
- if (error)
- return error;
- }
- if (!local)
- rmt_blks = xfs_attr3_rmt_blocks(mp, args->valuelen);
- } else {
- XFS_STATS_INC(mp, xs_attr_remove);
- rmt_blks = xfs_attr3_rmt_blocks(mp, XFS_XATTR_SIZE_MAX);
- }
- /*
- * Root fork attributes can use reserved data blocks for this
- * operation if necessary
- */
- xfs_init_attr_trans(args, &tres, &total);
- error = xfs_trans_alloc_inode(dp, &tres, total, 0, rsvd, &args->trans);
- if (error)
- return error;
- if (args->value || xfs_inode_hasattr(dp)) {
- error = xfs_iext_count_may_overflow(dp, XFS_ATTR_FORK,
- XFS_IEXT_ATTR_MANIP_CNT(rmt_blks));
- if (error == -EFBIG)
- error = xfs_iext_count_upgrade(args->trans, dp,
- XFS_IEXT_ATTR_MANIP_CNT(rmt_blks));
- if (error)
- goto out_trans_cancel;
- }
- error = xfs_attr_lookup(args);
- switch (error) {
- case -EEXIST:
- /* if no value, we are performing a remove operation */
- if (!args->value) {
- error = xfs_attr_defer_remove(args);
- break;
- }
- /* Pure create fails if the attr already exists */
- if (args->attr_flags & XATTR_CREATE)
- goto out_trans_cancel;
- error = xfs_attr_defer_replace(args);
- break;
- case -ENOATTR:
- /* Can't remove what isn't there. */
- if (!args->value)
- goto out_trans_cancel;
- /* Pure replace fails if no existing attr to replace. */
- if (args->attr_flags & XATTR_REPLACE)
- goto out_trans_cancel;
- error = xfs_attr_defer_add(args);
- break;
- default:
- goto out_trans_cancel;
- }
- if (error)
- goto out_trans_cancel;
- /*
- * If this is a synchronous mount, make sure that the
- * transaction goes to disk before returning to the user.
- */
- if (xfs_has_wsync(mp))
- xfs_trans_set_sync(args->trans);
- if (!(args->op_flags & XFS_DA_OP_NOTIME))
- xfs_trans_ichgtime(args->trans, dp, XFS_ICHGTIME_CHG);
- /*
- * Commit the last in the sequence of transactions.
- */
- xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
- error = xfs_trans_commit(args->trans);
- out_unlock:
- xfs_iunlock(dp, XFS_ILOCK_EXCL);
- return error;
- out_trans_cancel:
- if (args->trans)
- xfs_trans_cancel(args->trans);
- goto out_unlock;
- }
- /*========================================================================
- * External routines when attribute list is inside the inode
- *========================================================================*/
- static inline int xfs_attr_sf_totsize(struct xfs_inode *dp)
- {
- struct xfs_attr_shortform *sf;
- sf = (struct xfs_attr_shortform *)dp->i_af.if_u1.if_data;
- return be16_to_cpu(sf->hdr.totsize);
- }
- /*
- * Add a name to the shortform attribute list structure
- * This is the external routine.
- */
- static int
- xfs_attr_shortform_addname(
- struct xfs_da_args *args)
- {
- int newsize, forkoff;
- int error;
- trace_xfs_attr_sf_addname(args);
- error = xfs_attr_shortform_lookup(args);
- switch (error) {
- case -ENOATTR:
- if (args->op_flags & XFS_DA_OP_REPLACE)
- return error;
- break;
- case -EEXIST:
- if (!(args->op_flags & XFS_DA_OP_REPLACE))
- return error;
- error = xfs_attr_sf_removename(args);
- if (error)
- return error;
- /*
- * Since we have removed the old attr, clear XFS_DA_OP_REPLACE
- * so that the new attr doesn't fit in shortform format, the
- * leaf format add routine won't trip over the attr not being
- * around.
- */
- args->op_flags &= ~XFS_DA_OP_REPLACE;
- break;
- case 0:
- break;
- default:
- return error;
- }
- if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
- args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
- return -ENOSPC;
- newsize = xfs_attr_sf_totsize(args->dp);
- newsize += xfs_attr_sf_entsize_byname(args->namelen, args->valuelen);
- forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
- if (!forkoff)
- return -ENOSPC;
- xfs_attr_shortform_add(args, forkoff);
- return 0;
- }
- /*========================================================================
- * External routines when attribute list is one block
- *========================================================================*/
- /* Save the current remote block info and clear the current pointers. */
- static void
- xfs_attr_save_rmt_blk(
- struct xfs_da_args *args)
- {
- args->blkno2 = args->blkno;
- args->index2 = args->index;
- args->rmtblkno2 = args->rmtblkno;
- args->rmtblkcnt2 = args->rmtblkcnt;
- args->rmtvaluelen2 = args->rmtvaluelen;
- args->rmtblkno = 0;
- args->rmtblkcnt = 0;
- args->rmtvaluelen = 0;
- }
- /* Set stored info about a remote block */
- static void
- xfs_attr_restore_rmt_blk(
- struct xfs_da_args *args)
- {
- args->blkno = args->blkno2;
- args->index = args->index2;
- args->rmtblkno = args->rmtblkno2;
- args->rmtblkcnt = args->rmtblkcnt2;
- args->rmtvaluelen = args->rmtvaluelen2;
- }
- /*
- * Tries to add an attribute to an inode in leaf form
- *
- * This function is meant to execute as part of a delayed operation and leaves
- * the transaction handling to the caller. On success the attribute is added
- * and the inode and transaction are left dirty. If there is not enough space,
- * the attr data is converted to node format and -ENOSPC is returned. Caller is
- * responsible for handling the dirty inode and transaction or adding the attr
- * in node format.
- */
- STATIC int
- xfs_attr_leaf_try_add(
- struct xfs_da_args *args)
- {
- struct xfs_buf *bp;
- int error;
- error = xfs_attr3_leaf_read(args->trans, args->dp, 0, &bp);
- if (error)
- return error;
- /*
- * Look up the xattr name to set the insertion point for the new xattr.
- */
- error = xfs_attr3_leaf_lookup_int(bp, args);
- switch (error) {
- case -ENOATTR:
- if (args->op_flags & XFS_DA_OP_REPLACE)
- goto out_brelse;
- break;
- case -EEXIST:
- if (!(args->op_flags & XFS_DA_OP_REPLACE))
- goto out_brelse;
- trace_xfs_attr_leaf_replace(args);
- /*
- * Save the existing remote attr state so that the current
- * values reflect the state of the new attribute we are about to
- * add, not the attribute we just found and will remove later.
- */
- xfs_attr_save_rmt_blk(args);
- break;
- case 0:
- break;
- default:
- goto out_brelse;
- }
- return xfs_attr3_leaf_add(bp, args);
- out_brelse:
- xfs_trans_brelse(args->trans, bp);
- return error;
- }
- /*
- * Return EEXIST if attr is found, or ENOATTR if not
- */
- STATIC int
- xfs_attr_leaf_hasname(
- struct xfs_da_args *args,
- struct xfs_buf **bp)
- {
- int error = 0;
- error = xfs_attr3_leaf_read(args->trans, args->dp, 0, bp);
- if (error)
- return error;
- error = xfs_attr3_leaf_lookup_int(*bp, args);
- if (error != -ENOATTR && error != -EEXIST)
- xfs_trans_brelse(args->trans, *bp);
- return error;
- }
- /*
- * Remove a name from the leaf attribute list structure
- *
- * This leaf block cannot have a "remote" value, we only call this routine
- * if bmap_one_block() says there is only one block (ie: no remote blks).
- */
- STATIC int
- xfs_attr_leaf_removename(
- struct xfs_da_args *args)
- {
- struct xfs_inode *dp;
- struct xfs_buf *bp;
- int error, forkoff;
- trace_xfs_attr_leaf_removename(args);
- /*
- * Remove the attribute.
- */
- dp = args->dp;
- error = xfs_attr_leaf_hasname(args, &bp);
- if (error == -ENOATTR) {
- xfs_trans_brelse(args->trans, bp);
- if (args->op_flags & XFS_DA_OP_RECOVERY)
- return 0;
- return error;
- } else if (error != -EEXIST)
- return error;
- xfs_attr3_leaf_remove(bp, args);
- /*
- * If the result is small enough, shrink it all into the inode.
- */
- forkoff = xfs_attr_shortform_allfit(bp, dp);
- if (forkoff)
- return xfs_attr3_leaf_to_shortform(bp, args, forkoff);
- /* bp is gone due to xfs_da_shrink_inode */
- return 0;
- }
- /*
- * Look up a name in a leaf attribute list structure.
- *
- * This leaf block cannot have a "remote" value, we only call this routine
- * if bmap_one_block() says there is only one block (ie: no remote blks).
- *
- * Returns 0 on successful retrieval, otherwise an error.
- */
- STATIC int
- xfs_attr_leaf_get(xfs_da_args_t *args)
- {
- struct xfs_buf *bp;
- int error;
- trace_xfs_attr_leaf_get(args);
- error = xfs_attr_leaf_hasname(args, &bp);
- if (error == -ENOATTR) {
- xfs_trans_brelse(args->trans, bp);
- return error;
- } else if (error != -EEXIST)
- return error;
- error = xfs_attr3_leaf_getvalue(bp, args);
- xfs_trans_brelse(args->trans, bp);
- return error;
- }
- /* Return EEXIST if attr is found, or ENOATTR if not. */
- STATIC int
- xfs_attr_node_lookup(
- struct xfs_da_args *args,
- struct xfs_da_state *state)
- {
- int retval, error;
- /*
- * Search to see if name exists, and get back a pointer to it.
- */
- error = xfs_da3_node_lookup_int(state, &retval);
- if (error)
- return error;
- return retval;
- }
- /*========================================================================
- * External routines when attribute list size > geo->blksize
- *========================================================================*/
- STATIC int
- xfs_attr_node_addname_find_attr(
- struct xfs_attr_intent *attr)
- {
- struct xfs_da_args *args = attr->xattri_da_args;
- int error;
- /*
- * Search to see if name already exists, and get back a pointer
- * to where it should go.
- */
- xfs_attr_item_init_da_state(attr);
- error = xfs_attr_node_lookup(args, attr->xattri_da_state);
- switch (error) {
- case -ENOATTR:
- if (args->op_flags & XFS_DA_OP_REPLACE)
- goto error;
- break;
- case -EEXIST:
- if (!(args->op_flags & XFS_DA_OP_REPLACE))
- goto error;
- trace_xfs_attr_node_replace(args);
- /*
- * Save the existing remote attr state so that the current
- * values reflect the state of the new attribute we are about to
- * add, not the attribute we just found and will remove later.
- */
- xfs_attr_save_rmt_blk(args);
- break;
- case 0:
- break;
- default:
- goto error;
- }
- return 0;
- error:
- if (attr->xattri_da_state) {
- xfs_da_state_free(attr->xattri_da_state);
- attr->xattri_da_state = NULL;
- }
- return error;
- }
- /*
- * Add a name to a Btree-format attribute list.
- *
- * This will involve walking down the Btree, and may involve splitting
- * leaf nodes and even splitting intermediate nodes up to and including
- * the root node (a special case of an intermediate node).
- */
- static int
- xfs_attr_node_try_addname(
- struct xfs_attr_intent *attr)
- {
- struct xfs_da_state *state = attr->xattri_da_state;
- struct xfs_da_state_blk *blk;
- int error;
- trace_xfs_attr_node_addname(state->args);
- blk = &state->path.blk[state->path.active-1];
- ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
- error = xfs_attr3_leaf_add(blk->bp, state->args);
- if (error == -ENOSPC) {
- if (state->path.active == 1) {
- /*
- * Its really a single leaf node, but it had
- * out-of-line values so it looked like it *might*
- * have been a b-tree. Let the caller deal with this.
- */
- goto out;
- }
- /*
- * Split as many Btree elements as required.
- * This code tracks the new and old attr's location
- * in the index/blkno/rmtblkno/rmtblkcnt fields and
- * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
- */
- error = xfs_da3_split(state);
- if (error)
- goto out;
- } else {
- /*
- * Addition succeeded, update Btree hashvals.
- */
- xfs_da3_fixhashpath(state, &state->path);
- }
- out:
- xfs_da_state_free(state);
- attr->xattri_da_state = NULL;
- return error;
- }
- static int
- xfs_attr_node_removename(
- struct xfs_da_args *args,
- struct xfs_da_state *state)
- {
- struct xfs_da_state_blk *blk;
- int retval;
- /*
- * Remove the name and update the hashvals in the tree.
- */
- blk = &state->path.blk[state->path.active-1];
- ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
- retval = xfs_attr3_leaf_remove(blk->bp, args);
- xfs_da3_fixhashpath(state, &state->path);
- return retval;
- }
- static int
- xfs_attr_node_remove_attr(
- struct xfs_attr_intent *attr)
- {
- struct xfs_da_args *args = attr->xattri_da_args;
- struct xfs_da_state *state = xfs_da_state_alloc(args);
- int retval = 0;
- int error = 0;
- /*
- * The attr we are removing has already been marked incomplete, so
- * we need to set the filter appropriately to re-find the "old"
- * attribute entry after any split ops.
- */
- args->attr_filter |= XFS_ATTR_INCOMPLETE;
- error = xfs_da3_node_lookup_int(state, &retval);
- if (error)
- goto out;
- error = xfs_attr_node_removename(args, state);
- /*
- * Check to see if the tree needs to be collapsed.
- */
- if (retval && (state->path.active > 1)) {
- error = xfs_da3_join(state);
- if (error)
- goto out;
- }
- retval = error = 0;
- out:
- xfs_da_state_free(state);
- if (error)
- return error;
- return retval;
- }
- /*
- * Retrieve the attribute data from a node attribute list.
- *
- * This routine gets called for any attribute fork that has more than one
- * block, ie: both true Btree attr lists and for single-leaf-blocks with
- * "remote" values taking up more blocks.
- *
- * Returns 0 on successful retrieval, otherwise an error.
- */
- STATIC int
- xfs_attr_node_get(
- struct xfs_da_args *args)
- {
- struct xfs_da_state *state;
- struct xfs_da_state_blk *blk;
- int i;
- int error;
- trace_xfs_attr_node_get(args);
- /*
- * Search to see if name exists, and get back a pointer to it.
- */
- state = xfs_da_state_alloc(args);
- error = xfs_attr_node_lookup(args, state);
- if (error != -EEXIST)
- goto out_release;
- /*
- * Get the value, local or "remote"
- */
- blk = &state->path.blk[state->path.active - 1];
- error = xfs_attr3_leaf_getvalue(blk->bp, args);
- /*
- * If not in a transaction, we have to release all the buffers.
- */
- out_release:
- for (i = 0; i < state->path.active; i++) {
- xfs_trans_brelse(args->trans, state->path.blk[i].bp);
- state->path.blk[i].bp = NULL;
- }
- xfs_da_state_free(state);
- return error;
- }
- /* Returns true if the attribute entry name is valid. */
- bool
- xfs_attr_namecheck(
- const void *name,
- size_t length)
- {
- /*
- * MAXNAMELEN includes the trailing null, but (name/length) leave it
- * out, so use >= for the length check.
- */
- if (length >= MAXNAMELEN)
- return false;
- /* There shouldn't be any nulls here */
- return !memchr(name, 0, length);
- }
- int __init
- xfs_attr_intent_init_cache(void)
- {
- xfs_attr_intent_cache = kmem_cache_create("xfs_attr_intent",
- sizeof(struct xfs_attr_intent),
- 0, 0, NULL);
- return xfs_attr_intent_cache != NULL ? 0 : -ENOMEM;
- }
- void
- xfs_attr_intent_destroy_cache(void)
- {
- kmem_cache_destroy(xfs_attr_intent_cache);
- xfs_attr_intent_cache = NULL;
- }
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