diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_attr.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_attr.c | 1459 |
1 files changed, 1459 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c new file mode 100644 index 000000000000..7d95b16f0919 --- /dev/null +++ b/fs/xfs/libxfs/xfs_attr.c @@ -0,0 +1,1459 @@ +/* + * Copyright (c) 2000-2005 Silicon Graphics, 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_sb.h" +#include "xfs_ag.h" +#include "xfs_mount.h" +#include "xfs_da_format.h" +#include "xfs_da_btree.h" +#include "xfs_attr_sf.h" +#include "xfs_inode.h" +#include "xfs_alloc.h" +#include "xfs_trans.h" +#include "xfs_inode_item.h" +#include "xfs_bmap.h" +#include "xfs_bmap_util.h" +#include "xfs_bmap_btree.h" +#include "xfs_attr.h" +#include "xfs_attr_leaf.h" +#include "xfs_attr_remote.h" +#include "xfs_error.h" +#include "xfs_quota.h" +#include "xfs_trans_space.h" +#include "xfs_trace.h" +#include "xfs_dinode.h" + +/* + * 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_addname(xfs_da_args_t *args); +STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args); + +/* + * Internal routines when attribute list is more than one block. + */ +STATIC int xfs_attr_node_get(xfs_da_args_t *args); +STATIC int xfs_attr_node_addname(xfs_da_args_t *args); +STATIC int xfs_attr_node_removename(xfs_da_args_t *args); +STATIC int xfs_attr_fillstate(xfs_da_state_t *state); +STATIC int xfs_attr_refillstate(xfs_da_state_t *state); + + +STATIC int +xfs_attr_args_init( + struct xfs_da_args *args, + struct xfs_inode *dp, + const unsigned char *name, + int flags) +{ + + if (!name) + return EINVAL; + + memset(args, 0, sizeof(*args)); + args->geo = dp->i_mount->m_attr_geo; + args->whichfork = XFS_ATTR_FORK; + args->dp = dp; + args->flags = flags; + args->name = name; + args->namelen = strlen((const char *)name); + if (args->namelen >= MAXNAMELEN) + return EFAULT; /* match IRIX behaviour */ + + args->hashval = xfs_da_hashname(args->name, args->namelen); + return 0; +} + +int +xfs_inode_hasattr( + struct xfs_inode *ip) +{ + if (!XFS_IFORK_Q(ip) || + (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS && + ip->i_d.di_anextents == 0)) + return 0; + return 1; +} + +/*======================================================================== + * Overall external interface routines. + *========================================================================*/ + +int +xfs_attr_get( + struct xfs_inode *ip, + const unsigned char *name, + unsigned char *value, + int *valuelenp, + int flags) +{ + struct xfs_da_args args; + uint lock_mode; + int error; + + XFS_STATS_INC(xs_attr_get); + + if (XFS_FORCED_SHUTDOWN(ip->i_mount)) + return EIO; + + if (!xfs_inode_hasattr(ip)) + return ENOATTR; + + error = xfs_attr_args_init(&args, ip, name, flags); + if (error) + return error; + + args.value = value; + args.valuelen = *valuelenp; + + lock_mode = xfs_ilock_attr_map_shared(ip); + if (!xfs_inode_hasattr(ip)) + error = ENOATTR; + else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) + error = xfs_attr_shortform_getvalue(&args); + else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) + error = xfs_attr_leaf_get(&args); + else + error = xfs_attr_node_get(&args); + xfs_iunlock(ip, lock_mode); + + *valuelenp = args.valuelen; + return error == EEXIST ? 0 : error; +} + +/* + * Calculate how many blocks we need for the new attribute, + */ +STATIC 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; +} + +int +xfs_attr_set( + struct xfs_inode *dp, + const unsigned char *name, + unsigned char *value, + int valuelen, + int flags) +{ + struct xfs_mount *mp = dp->i_mount; + struct xfs_da_args args; + struct xfs_bmap_free flist; + struct xfs_trans_res tres; + xfs_fsblock_t firstblock; + int rsvd = (flags & ATTR_ROOT) != 0; + int error, err2, committed, local; + + XFS_STATS_INC(xs_attr_set); + + if (XFS_FORCED_SHUTDOWN(dp->i_mount)) + return EIO; + + error = xfs_attr_args_init(&args, dp, name, flags); + if (error) + return error; + + args.value = value; + args.valuelen = valuelen; + args.firstblock = &firstblock; + args.flist = &flist; + args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT; + args.total = xfs_attr_calc_size(&args, &local); + + error = xfs_qm_dqattach(dp, 0); + if (error) + return error; + + /* + * If the inode doesn't have an attribute fork, add one. + * (inode must not be locked when we call this routine) + */ + if (XFS_IFORK_Q(dp) == 0) { + int sf_size = sizeof(xfs_attr_sf_hdr_t) + + XFS_ATTR_SF_ENTSIZE_BYNAME(args.namelen, valuelen); + + error = xfs_bmap_add_attrfork(dp, sf_size, rsvd); + if (error) + return error; + } + + /* + * 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. + */ + args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET); + + /* + * Root fork attributes can use reserved data blocks for this + * operation if necessary + */ + + if (rsvd) + args.trans->t_flags |= XFS_TRANS_RESERVE; + + 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; + error = xfs_trans_reserve(args.trans, &tres, args.total, 0); + if (error) { + xfs_trans_cancel(args.trans, 0); + return error; + } + xfs_ilock(dp, XFS_ILOCK_EXCL); + + error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0, + rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES : + XFS_QMOPT_RES_REGBLKS); + if (error) { + xfs_iunlock(dp, XFS_ILOCK_EXCL); + xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES); + return error; + } + + xfs_trans_ijoin(args.trans, dp, 0); + + /* + * If the attribute list is non-existent or a shortform list, + * upgrade it to a single-leaf-block attribute list. + */ + if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL || + (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS && + dp->i_d.di_anextents == 0)) { + + /* + * Build initial attribute list (if required). + */ + if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) + xfs_attr_shortform_create(&args); + + /* + * Try to add the attr to the attribute list in + * the inode. + */ + error = xfs_attr_shortform_addname(&args); + if (error != ENOSPC) { + /* + * Commit the shortform mods, and we're done. + * NOTE: this is also the error path (EEXIST, etc). + */ + ASSERT(args.trans != NULL); + + /* + * If this is a synchronous mount, make sure that + * the transaction goes to disk before returning + * to the user. + */ + if (mp->m_flags & XFS_MOUNT_WSYNC) + xfs_trans_set_sync(args.trans); + + if (!error && (flags & ATTR_KERNOTIME) == 0) { + xfs_trans_ichgtime(args.trans, dp, + XFS_ICHGTIME_CHG); + } + err2 = xfs_trans_commit(args.trans, + XFS_TRANS_RELEASE_LOG_RES); + xfs_iunlock(dp, XFS_ILOCK_EXCL); + + return error ? error : err2; + } + + /* + * It won't fit in the shortform, transform to a leaf block. + * GROT: another possible req'mt for a double-split btree op. + */ + xfs_bmap_init(args.flist, args.firstblock); + error = xfs_attr_shortform_to_leaf(&args); + if (!error) { + error = xfs_bmap_finish(&args.trans, args.flist, + &committed); + } + if (error) { + ASSERT(committed); + args.trans = NULL; + xfs_bmap_cancel(&flist); + goto out; + } + + /* + * bmap_finish() may have committed the last trans and started + * a new one. We need the inode to be in all transactions. + */ + if (committed) + xfs_trans_ijoin(args.trans, dp, 0); + + /* + * Commit the leaf transformation. We'll need another (linked) + * transaction to add the new attribute to the leaf. + */ + + error = xfs_trans_roll(&args.trans, dp); + if (error) + goto out; + + } + + if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) + error = xfs_attr_leaf_addname(&args); + else + error = xfs_attr_node_addname(&args); + if (error) + goto out; + + /* + * If this is a synchronous mount, make sure that the + * transaction goes to disk before returning to the user. + */ + if (mp->m_flags & XFS_MOUNT_WSYNC) + xfs_trans_set_sync(args.trans); + + if ((flags & ATTR_KERNOTIME) == 0) + 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, XFS_TRANS_RELEASE_LOG_RES); + xfs_iunlock(dp, XFS_ILOCK_EXCL); + + return error; + +out: + if (args.trans) { + xfs_trans_cancel(args.trans, + XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT); + } + xfs_iunlock(dp, XFS_ILOCK_EXCL); + return error; +} + +/* + * Generic handler routine to remove a name from an attribute list. + * Transitions attribute list from Btree to shortform as necessary. + */ +int +xfs_attr_remove( + struct xfs_inode *dp, + const unsigned char *name, + int flags) +{ + struct xfs_mount *mp = dp->i_mount; + struct xfs_da_args args; + struct xfs_bmap_free flist; + xfs_fsblock_t firstblock; + int error; + + XFS_STATS_INC(xs_attr_remove); + + if (XFS_FORCED_SHUTDOWN(dp->i_mount)) + return EIO; + + if (!xfs_inode_hasattr(dp)) + return ENOATTR; + + error = xfs_attr_args_init(&args, dp, name, flags); + if (error) + return error; + + args.firstblock = &firstblock; + args.flist = &flist; + + /* + * 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. + */ + args.op_flags = XFS_DA_OP_OKNOENT; + + error = xfs_qm_dqattach(dp, 0); + if (error) + return error; + + /* + * 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. + */ + args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM); + + /* + * Root fork attributes can use reserved data blocks for this + * operation if necessary + */ + + if (flags & ATTR_ROOT) + args.trans->t_flags |= XFS_TRANS_RESERVE; + + error = xfs_trans_reserve(args.trans, &M_RES(mp)->tr_attrrm, + XFS_ATTRRM_SPACE_RES(mp), 0); + if (error) { + xfs_trans_cancel(args.trans, 0); + return error; + } + + xfs_ilock(dp, XFS_ILOCK_EXCL); + /* + * No need to make quota reservations here. We expect to release some + * blocks not allocate in the common case. + */ + xfs_trans_ijoin(args.trans, dp, 0); + + if (!xfs_inode_hasattr(dp)) { + error = ENOATTR; + } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) { + ASSERT(dp->i_afp->if_flags & XFS_IFINLINE); + error = xfs_attr_shortform_remove(&args); + } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) { + error = xfs_attr_leaf_removename(&args); + } else { + error = xfs_attr_node_removename(&args); + } + + if (error) + goto out; + + /* + * If this is a synchronous mount, make sure that the + * transaction goes to disk before returning to the user. + */ + if (mp->m_flags & XFS_MOUNT_WSYNC) + xfs_trans_set_sync(args.trans); + + if ((flags & ATTR_KERNOTIME) == 0) + 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, XFS_TRANS_RELEASE_LOG_RES); + xfs_iunlock(dp, XFS_ILOCK_EXCL); + + return error; + +out: + if (args.trans) { + xfs_trans_cancel(args.trans, + XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT); + } + xfs_iunlock(dp, XFS_ILOCK_EXCL); + return error; +} + +/*======================================================================== + * External routines when attribute list is inside the inode + *========================================================================*/ + +/* + * Add a name to the shortform attribute list structure + * This is the external routine. + */ +STATIC int +xfs_attr_shortform_addname(xfs_da_args_t *args) +{ + int newsize, forkoff, retval; + + trace_xfs_attr_sf_addname(args); + + retval = xfs_attr_shortform_lookup(args); + if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) { + return retval; + } else if (retval == EEXIST) { + if (args->flags & ATTR_CREATE) + return retval; + retval = xfs_attr_shortform_remove(args); + ASSERT(retval == 0); + } + + 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 + *========================================================================*/ + +/* + * Add a name to 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_addname(xfs_da_args_t *args) +{ + xfs_inode_t *dp; + struct xfs_buf *bp; + int retval, error, committed, forkoff; + + trace_xfs_attr_leaf_addname(args); + + /* + * Read the (only) block in the attribute list in. + */ + dp = args->dp; + args->blkno = 0; + error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp); + if (error) + return error; + + /* + * Look up the given attribute in the leaf block. Figure out if + * the given flags produce an error or call for an atomic rename. + */ + retval = xfs_attr3_leaf_lookup_int(bp, args); + if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) { + xfs_trans_brelse(args->trans, bp); + return retval; + } else if (retval == EEXIST) { + if (args->flags & ATTR_CREATE) { /* pure create op */ + xfs_trans_brelse(args->trans, bp); + return retval; + } + + trace_xfs_attr_leaf_replace(args); + + /* save the attribute state for later removal*/ + args->op_flags |= XFS_DA_OP_RENAME; /* an atomic rename */ + args->blkno2 = args->blkno; /* set 2nd entry info*/ + args->index2 = args->index; + args->rmtblkno2 = args->rmtblkno; + args->rmtblkcnt2 = args->rmtblkcnt; + args->rmtvaluelen2 = args->rmtvaluelen; + + /* + * clear the remote attr state now that it is saved so that the + * values reflect the state of the attribute we are about to + * add, not the attribute we just found and will remove later. + */ + args->rmtblkno = 0; + args->rmtblkcnt = 0; + args->rmtvaluelen = 0; + } + + /* + * Add the attribute to the leaf block, transitioning to a Btree + * if required. + */ + retval = xfs_attr3_leaf_add(bp, args); + if (retval == ENOSPC) { + /* + * Promote the attribute list to the Btree format, then + * Commit that transaction so that the node_addname() call + * can manage its own transactions. + */ + xfs_bmap_init(args->flist, args->firstblock); + error = xfs_attr3_leaf_to_node(args); + if (!error) { + error = xfs_bmap_finish(&args->trans, args->flist, + &committed); + } + if (error) { + ASSERT(committed); + args->trans = NULL; + xfs_bmap_cancel(args->flist); + return error; + } + + /* + * bmap_finish() may have committed the last trans and started + * a new one. We need the inode to be in all transactions. + */ + if (committed) + xfs_trans_ijoin(args->trans, dp, 0); + + /* + * Commit the current trans (including the inode) and start + * a new one. + */ + error = xfs_trans_roll(&args->trans, dp); + if (error) + return error; + + /* + * Fob the whole rest of the problem off on the Btree code. + */ + error = xfs_attr_node_addname(args); + return error; + } + + /* + * Commit the transaction that added the attr name so that + * later routines can manage their own transactions. + */ + error = xfs_trans_roll(&args->trans, dp); + if (error) + return error; + + /* + * 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 (args->rmtblkno > 0) { + error = xfs_attr_rmtval_set(args); + if (error) + return error; + } + + /* + * If this is an atomic rename operation, we must "flip" the + * incomplete flags on the "new" and "old" attribute/value pairs + * so that one disappears and one appears atomically. Then we + * must remove the "old" attribute/value pair. + */ + if (args->op_flags & XFS_DA_OP_RENAME) { + /* + * In a separate transaction, set the incomplete flag on the + * "old" attr and clear the incomplete flag on the "new" attr. + */ + error = xfs_attr3_leaf_flipflags(args); + if (error) + return error; + + /* + * Dismantle the "old" attribute/value pair by removing + * a "remote" value (if it exists). + */ + args->index = args->index2; + args->blkno = args->blkno2; + args->rmtblkno = args->rmtblkno2; + args->rmtblkcnt = args->rmtblkcnt2; + args->rmtvaluelen = args->rmtvaluelen2; + if (args->rmtblkno) { + error = xfs_attr_rmtval_remove(args); + if (error) + return error; + } + + /* + * Read in the block containing the "old" attr, then + * remove the "old" attr from that block (neat, huh!) + */ + error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, + -1, &bp); + if (error) + return error; + + xfs_attr3_leaf_remove(bp, args); + + /* + * If the result is small enough, shrink it all into the inode. + */ + if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) { + xfs_bmap_init(args->flist, args->firstblock); + error = xfs_attr3_leaf_to_shortform(bp, args, forkoff); + /* bp is gone due to xfs_da_shrink_inode */ + if (!error) { + error = xfs_bmap_finish(&args->trans, + args->flist, + &committed); + } + if (error) { + ASSERT(committed); + args->trans = NULL; + xfs_bmap_cancel(args->flist); + return error; + } + + /* + * bmap_finish() may have committed the last trans + * and started a new one. We need the inode to be + * in all transactions. + */ + if (committed) + xfs_trans_ijoin(args->trans, dp, 0); + } + + /* + * Commit the remove and start the next trans in series. + */ + error = xfs_trans_roll(&args->trans, dp); + + } else if (args->rmtblkno > 0) { + /* + * Added a "remote" value, just clear the incomplete flag. + */ + error = xfs_attr3_leaf_clearflag(args); + } + 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(xfs_da_args_t *args) +{ + xfs_inode_t *dp; + struct xfs_buf *bp; + int error, committed, forkoff; + + trace_xfs_attr_leaf_removename(args); + + /* + * Remove the attribute. + */ + dp = args->dp; + args->blkno = 0; + error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp); + if (error) + return error; + + error = xfs_attr3_leaf_lookup_int(bp, args); + if (error == ENOATTR) { + xfs_trans_brelse(args->trans, bp); + return error; + } + + xfs_attr3_leaf_remove(bp, args); + + /* + * If the result is small enough, shrink it all into the inode. + */ + if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) { + xfs_bmap_init(args->flist, args->firstblock); + error = xfs_attr3_leaf_to_shortform(bp, args, forkoff); + /* bp is gone due to xfs_da_shrink_inode */ + if (!error) { + error = xfs_bmap_finish(&args->trans, args->flist, + &committed); + } + if (error) { + ASSERT(committed); + args->trans = NULL; + xfs_bmap_cancel(args->flist); + return error; + } + + /* + * bmap_finish() may have committed the last trans and started + * a new one. We need the inode to be in all transactions. + */ + if (committed) + xfs_trans_ijoin(args->trans, dp, 0); + } + 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). + */ +STATIC int +xfs_attr_leaf_get(xfs_da_args_t *args) +{ + struct xfs_buf *bp; + int error; + + trace_xfs_attr_leaf_get(args); + + args->blkno = 0; + error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp); + if (error) + return error; + + error = xfs_attr3_leaf_lookup_int(bp, args); + if (error != EEXIST) { + xfs_trans_brelse(args->trans, bp); + return error; + } + error = xfs_attr3_leaf_getvalue(bp, args); + xfs_trans_brelse(args->trans, bp); + if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) { + error = xfs_attr_rmtval_get(args); + } + return error; +} + +/*======================================================================== + * External routines when attribute list size > geo->blksize + *========================================================================*/ + +/* + * 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). + * + * "Remote" attribute values confuse the issue and atomic rename operations + * add a whole extra layer of confusion on top of that. + */ +STATIC int +xfs_attr_node_addname(xfs_da_args_t *args) +{ + xfs_da_state_t *state; + xfs_da_state_blk_t *blk; + xfs_inode_t *dp; + xfs_mount_t *mp; + int committed, retval, error; + + trace_xfs_attr_node_addname(args); + + /* + * Fill in bucket of arguments/results/context to carry around. + */ + dp = args->dp; + mp = dp->i_mount; +restart: + state = xfs_da_state_alloc(); + state->args = args; + state->mp = mp; + + /* + * Search to see if name already exists, and get back a pointer + * to where it should go. + */ + error = xfs_da3_node_lookup_int(state, &retval); + if (error) + goto out; + blk = &state->path.blk[ state->path.active-1 ]; + ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC); + if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) { + goto out; + } else if (retval == EEXIST) { + if (args->flags & ATTR_CREATE) + goto out; + + trace_xfs_attr_node_replace(args); + + /* save the attribute state for later removal*/ + args->op_flags |= XFS_DA_OP_RENAME; /* atomic rename op */ + args->blkno2 = args->blkno; /* set 2nd entry info*/ + args->index2 = args->index; + args->rmtblkno2 = args->rmtblkno; + args->rmtblkcnt2 = args->rmtblkcnt; + args->rmtvaluelen2 = args->rmtvaluelen; + + /* + * clear the remote attr state now that it is saved so that the + * values reflect the state of the attribute we are about to + * add, not the attribute we just found and will remove later. + */ + args->rmtblkno = 0; + args->rmtblkcnt = 0; + args->rmtvaluelen = 0; + } + + retval = xfs_attr3_leaf_add(blk->bp, state->args); + if (retval == 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. + */ + xfs_da_state_free(state); + state = NULL; + xfs_bmap_init(args->flist, args->firstblock); + error = xfs_attr3_leaf_to_node(args); + if (!error) { + error = xfs_bmap_finish(&args->trans, + args->flist, + &committed); + } + if (error) { + ASSERT(committed); + args->trans = NULL; + xfs_bmap_cancel(args->flist); + goto out; + } + + /* + * bmap_finish() may have committed the last trans + * and started a new one. We need the inode to be + * in all transactions. + */ + if (committed) + xfs_trans_ijoin(args->trans, dp, 0); + + /* + * Commit the node conversion and start the next + * trans in the chain. + */ + error = xfs_trans_roll(&args->trans, dp); + if (error) + goto out; + + goto restart; + } + + /* + * 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. + */ + xfs_bmap_init(args->flist, args->firstblock); + error = xfs_da3_split(state); + if (!error) { + error = xfs_bmap_finish(&args->trans, args->flist, + &committed); + } + if (error) { + ASSERT(committed); + args->trans = NULL; + xfs_bmap_cancel(args->flist); + goto out; + } + + /* + * bmap_finish() may have committed the last trans and started + * a new one. We need the inode to be in all transactions. + */ + if (committed) + xfs_trans_ijoin(args->trans, dp, 0); + } else { + /* + * Addition succeeded, update Btree hashvals. + */ + xfs_da3_fixhashpath(state, &state->path); + } + + /* + * Kill the state structure, we're done with it and need to + * allow the buffers to come back later. + */ + xfs_da_state_free(state); + state = NULL; + + /* + * Commit the leaf addition or btree split and start the next + * trans in the chain. + */ + error = xfs_trans_roll(&args->trans, dp); + if (error) + goto out; + + /* + * 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 (args->rmtblkno > 0) { + error = xfs_attr_rmtval_set(args); + if (error) + return error; + } + + /* + * If this is an atomic rename operation, we must "flip" the + * incomplete flags on the "new" and "old" attribute/value pairs + * so that one disappears and one appears atomically. Then we + * must remove the "old" attribute/value pair. + */ + if (args->op_flags & XFS_DA_OP_RENAME) { + /* + * In a separate transaction, set the incomplete flag on the + * "old" attr and clear the incomplete flag on the "new" attr. + */ + error = xfs_attr3_leaf_flipflags(args); + if (error) + goto out; + + /* + * Dismantle the "old" attribute/value pair by removing + * a "remote" value (if it exists). + */ + args->index = args->index2; + args->blkno = args->blkno2; + args->rmtblkno = args->rmtblkno2; + args->rmtblkcnt = args->rmtblkcnt2; + args->rmtvaluelen = args->rmtvaluelen2; + if (args->rmtblkno) { + error = xfs_attr_rmtval_remove(args); + if (error) + return error; + } + + /* + * Re-find the "old" attribute entry after any split ops. + * The INCOMPLETE flag means that we will find the "old" + * attr, not the "new" one. + */ + args->flags |= XFS_ATTR_INCOMPLETE; + state = xfs_da_state_alloc(); + state->args = args; + state->mp = mp; + state->inleaf = 0; + error = xfs_da3_node_lookup_int(state, &retval); + if (error) + goto out; + + /* + * 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); + error = xfs_attr3_leaf_remove(blk->bp, args); + xfs_da3_fixhashpath(state, &state->path); + + /* + * Check to see if the tree needs to be collapsed. + */ + if (retval && (state->path.active > 1)) { + xfs_bmap_init(args->flist, args->firstblock); + error = xfs_da3_join(state); + if (!error) { + error = xfs_bmap_finish(&args->trans, + args->flist, + &committed); + } + if (error) { + ASSERT(committed); + args->trans = NULL; + xfs_bmap_cancel(args->flist); + goto out; + } + + /* + * bmap_finish() may have committed the last trans + * and started a new one. We need the inode to be + * in all transactions. + */ + if (committed) + xfs_trans_ijoin(args->trans, dp, 0); + } + + /* + * Commit and start the next trans in the chain. + */ + error = xfs_trans_roll(&args->trans, dp); + if (error) + goto out; + + } else if (args->rmtblkno > 0) { + /* + * Added a "remote" value, just clear the incomplete flag. + */ + error = xfs_attr3_leaf_clearflag(args); + if (error) + goto out; + } + retval = error = 0; + +out: + if (state) + xfs_da_state_free(state); + if (error) + return error; + return retval; +} + +/* + * Remove a name from a B-tree attribute list. + * + * This will involve walking down the Btree, and may involve joining + * leaf nodes and even joining intermediate nodes up to and including + * the root node (a special case of an intermediate node). + */ +STATIC int +xfs_attr_node_removename(xfs_da_args_t *args) +{ + xfs_da_state_t *state; + xfs_da_state_blk_t *blk; + xfs_inode_t *dp; + struct xfs_buf *bp; + int retval, error, committed, forkoff; + + trace_xfs_attr_node_removename(args); + + /* + * Tie a string around our finger to remind us where we are. + */ + dp = args->dp; + state = xfs_da_state_alloc(); + state->args = args; + state->mp = dp->i_mount; + + /* + * Search to see if name exists, and get back a pointer to it. + */ + error = xfs_da3_node_lookup_int(state, &retval); + if (error || (retval != EEXIST)) { + if (error == 0) + error = retval; + goto out; + } + + /* + * If there is an out-of-line value, de-allocate the blocks. + * This is done before we remove the attribute so that we don't + * overflow the maximum size of a transaction and/or hit a deadlock. + */ + blk = &state->path.blk[ state->path.active-1 ]; + ASSERT(blk->bp != NULL); + ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC); + if (args->rmtblkno > 0) { + /* + * 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) + goto out; + + /* + * Mark the attribute as INCOMPLETE, then bunmapi() the + * remote value. + */ + error = xfs_attr3_leaf_setflag(args); + if (error) + goto out; + error = xfs_attr_rmtval_remove(args); + if (error) + goto out; + + /* + * Refill the state structure with buffers, the prior calls + * released our buffers. + */ + error = xfs_attr_refillstate(state); + if (error) + goto out; + } + + /* + * 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); + + /* + * Check to see if the tree needs to be collapsed. + */ + if (retval && (state->path.active > 1)) { + xfs_bmap_init(args->flist, args->firstblock); + error = xfs_da3_join(state); + if (!error) { + error = xfs_bmap_finish(&args->trans, args->flist, + &committed); + } + if (error) { + ASSERT(committed); + args->trans = NULL; + xfs_bmap_cancel(args->flist); + goto out; + } + + /* + * bmap_finish() may have committed the last trans and started + * a new one. We need the inode to be in all transactions. + */ + if (committed) + xfs_trans_ijoin(args->trans, dp, 0); + + /* + * Commit the Btree join operation and start a new trans. + */ + error = xfs_trans_roll(&args->trans, dp); + if (error) + goto out; + } + + /* + * If the result is small enough, push it all into the inode. + */ + if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) { + /* + * Have to get rid of the copy of this dabuf in the state. + */ + ASSERT(state->path.active == 1); + ASSERT(state->path.blk[0].bp); + state->path.blk[0].bp = NULL; + + error = xfs_attr3_leaf_read(args->trans, args->dp, 0, -1, &bp); + if (error) + goto out; + + if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) { + xfs_bmap_init(args->flist, args->firstblock); + error = xfs_attr3_leaf_to_shortform(bp, args, forkoff); + /* bp is gone due to xfs_da_shrink_inode */ + if (!error) { + error = xfs_bmap_finish(&args->trans, + args->flist, + &committed); + } + if (error) { + ASSERT(committed); + args->trans = NULL; + xfs_bmap_cancel(args->flist); + goto out; + } + + /* + * bmap_finish() may have committed the last trans + * and started a new one. We need the inode to be + * in all transactions. + */ + if (committed) + xfs_trans_ijoin(args->trans, dp, 0); + } else + xfs_trans_brelse(args->trans, bp); + } + error = 0; + +out: + xfs_da_state_free(state); + return error; +} + +/* + * 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_ADDR(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_ADDR(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(state->args->trans, + state->args->dp, + blk->blkno, 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(state->args->trans, + state->args->dp, + blk->blkno, blk->disk_blkno, + &blk->bp, XFS_ATTR_FORK); + if (error) + return error; + } else { + blk->bp = NULL; + } + } + + return 0; +} + +/* + * Look up a filename in 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. + */ +STATIC int +xfs_attr_node_get(xfs_da_args_t *args) +{ + xfs_da_state_t *state; + xfs_da_state_blk_t *blk; + int error, retval; + int i; + + trace_xfs_attr_node_get(args); + + state = xfs_da_state_alloc(); + state->args = args; + state->mp = args->dp->i_mount; + + /* + * Search to see if name exists, and get back a pointer to it. + */ + error = xfs_da3_node_lookup_int(state, &retval); + if (error) { + retval = error; + } else if (retval == EEXIST) { + blk = &state->path.blk[ state->path.active-1 ]; + ASSERT(blk->bp != NULL); + ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC); + + /* + * Get the value, local or "remote" + */ + retval = xfs_attr3_leaf_getvalue(blk->bp, args); + if (!retval && (args->rmtblkno > 0) + && !(args->flags & ATTR_KERNOVAL)) { + retval = xfs_attr_rmtval_get(args); + } + } + + /* + * If not in a transaction, we have to release all the buffers. + */ + 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 retval; +} |
