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@@ -0,0 +1,529 @@
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+/*
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+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
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+ * Copyright (c) 2012-2013 Red Hat, Inc.
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+ * All rights reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it would be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write the Free Software Foundation,
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+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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+ */
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+#include "xfs.h"
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+#include "xfs_fs.h"
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+#include "xfs_types.h"
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+#include "xfs_bit.h"
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+#include "xfs_log.h"
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+#include "xfs_trans.h"
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+#include "xfs_sb.h"
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+#include "xfs_ag.h"
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+#include "xfs_dir2.h"
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+#include "xfs_mount.h"
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+#include "xfs_da_btree.h"
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+#include "xfs_bmap_btree.h"
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+#include "xfs_ialloc_btree.h"
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+#include "xfs_dinode.h"
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+#include "xfs_inode.h"
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+#include "xfs_inode_item.h"
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+#include "xfs_itable.h"
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+#include "xfs_ialloc.h"
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+#include "xfs_alloc.h"
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+#include "xfs_bmap.h"
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+#include "xfs_error.h"
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+#include "xfs_quota.h"
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+#include "xfs_utils.h"
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+#include "xfs_trans_space.h"
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+#include "xfs_log_priv.h"
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+#include "xfs_trace.h"
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+#include "xfs_symlink.h"
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+
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+void
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+xfs_symlink_local_to_remote(
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+ struct xfs_trans *tp,
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+ struct xfs_buf *bp,
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+ struct xfs_inode *ip,
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+ struct xfs_ifork *ifp)
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+{
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+ /* remote symlink blocks are not verifiable until CRCs come along */
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+ bp->b_ops = NULL;
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+ memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes);
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+}
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+
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+/* ----- Kernel only functions below ----- */
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+
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+STATIC int
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+xfs_readlink_bmap(
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+ xfs_inode_t *ip,
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+ char *link)
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+{
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+ xfs_mount_t *mp = ip->i_mount;
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+ int pathlen = ip->i_d.di_size;
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+ int nmaps = XFS_SYMLINK_MAPS;
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+ xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS];
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+ xfs_daddr_t d;
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+ int byte_cnt;
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+ int n;
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+ xfs_buf_t *bp;
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+ int error = 0;
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+
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+ error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, pathlen), mval, &nmaps,
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+ 0);
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+ if (error)
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+ goto out;
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+
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+ for (n = 0; n < nmaps; n++) {
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+ d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
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+ byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
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+
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+ bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0, NULL);
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+ if (!bp)
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+ return XFS_ERROR(ENOMEM);
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+ error = bp->b_error;
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+ if (error) {
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+ xfs_buf_ioerror_alert(bp, __func__);
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+ xfs_buf_relse(bp);
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+ goto out;
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+ }
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+ if (pathlen < byte_cnt)
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+ byte_cnt = pathlen;
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+ pathlen -= byte_cnt;
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+
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+ memcpy(link, bp->b_addr, byte_cnt);
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+ xfs_buf_relse(bp);
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+ }
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+
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+ link[ip->i_d.di_size] = '\0';
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+ error = 0;
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+
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+ out:
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+ return error;
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+}
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+
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+int
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+xfs_readlink(
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+ xfs_inode_t *ip,
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+ char *link)
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+{
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+ xfs_mount_t *mp = ip->i_mount;
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+ xfs_fsize_t pathlen;
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+ int error = 0;
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+
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+ trace_xfs_readlink(ip);
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+
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+ if (XFS_FORCED_SHUTDOWN(mp))
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+ return XFS_ERROR(EIO);
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+
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+ xfs_ilock(ip, XFS_ILOCK_SHARED);
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+
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+ pathlen = ip->i_d.di_size;
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+ if (!pathlen)
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+ goto out;
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+
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+ if (pathlen < 0 || pathlen > MAXPATHLEN) {
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+ xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)",
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+ __func__, (unsigned long long) ip->i_ino,
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+ (long long) pathlen);
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+ ASSERT(0);
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+ error = XFS_ERROR(EFSCORRUPTED);
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+ goto out;
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+ }
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+
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+
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+ if (ip->i_df.if_flags & XFS_IFINLINE) {
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+ memcpy(link, ip->i_df.if_u1.if_data, pathlen);
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+ link[pathlen] = '\0';
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+ } else {
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+ error = xfs_readlink_bmap(ip, link);
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+ }
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+
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+ out:
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+ xfs_iunlock(ip, XFS_ILOCK_SHARED);
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+ return error;
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+}
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+
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+int
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+xfs_symlink(
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+ xfs_inode_t *dp,
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+ struct xfs_name *link_name,
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+ const char *target_path,
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+ umode_t mode,
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+ xfs_inode_t **ipp)
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+{
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+ xfs_mount_t *mp = dp->i_mount;
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+ xfs_trans_t *tp;
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+ xfs_inode_t *ip;
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+ int error;
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+ int pathlen;
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+ xfs_bmap_free_t free_list;
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+ xfs_fsblock_t first_block;
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+ bool unlock_dp_on_error = false;
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+ uint cancel_flags;
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+ int committed;
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+ xfs_fileoff_t first_fsb;
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+ xfs_filblks_t fs_blocks;
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+ int nmaps;
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+ xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS];
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+ xfs_daddr_t d;
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+ const char *cur_chunk;
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+ int byte_cnt;
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+ int n;
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+ xfs_buf_t *bp;
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+ prid_t prid;
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+ struct xfs_dquot *udqp, *gdqp;
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+ uint resblks;
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+
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+ *ipp = NULL;
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+ error = 0;
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+ ip = NULL;
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+ tp = NULL;
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+
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+ trace_xfs_symlink(dp, link_name);
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+
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+ if (XFS_FORCED_SHUTDOWN(mp))
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+ return XFS_ERROR(EIO);
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+
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+ /*
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+ * Check component lengths of the target path name.
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+ */
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+ pathlen = strlen(target_path);
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+ if (pathlen >= MAXPATHLEN) /* total string too long */
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+ return XFS_ERROR(ENAMETOOLONG);
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+
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+ udqp = gdqp = NULL;
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+ if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
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+ prid = xfs_get_projid(dp);
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+ else
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+ prid = XFS_PROJID_DEFAULT;
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+
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+ /*
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+ * Make sure that we have allocated dquot(s) on disk.
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+ */
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+ error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
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+ XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
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+ if (error)
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+ goto std_return;
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+
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+ tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
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+ cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
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+ /*
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+ * The symlink will fit into the inode data fork?
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+ * There can't be any attributes so we get the whole variable part.
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+ */
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+ if (pathlen <= XFS_LITINO(mp, dp->i_d.di_version))
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+ fs_blocks = 0;
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+ else
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+ fs_blocks = XFS_B_TO_FSB(mp, pathlen);
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+ resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
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+ error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
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+ XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
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+ if (error == ENOSPC && fs_blocks == 0) {
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+ resblks = 0;
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+ error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
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+ XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
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+ }
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+ if (error) {
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+ cancel_flags = 0;
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+ goto error_return;
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+ }
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+
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+ xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
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+ unlock_dp_on_error = true;
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+
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+ /*
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+ * Check whether the directory allows new symlinks or not.
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+ */
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+ if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
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+ error = XFS_ERROR(EPERM);
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+ goto error_return;
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+ }
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+
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+ /*
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+ * Reserve disk quota : blocks and inode.
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+ */
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+ error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
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+ if (error)
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+ goto error_return;
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+
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+ /*
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+ * Check for ability to enter directory entry, if no space reserved.
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+ */
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+ error = xfs_dir_canenter(tp, dp, link_name, resblks);
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+ if (error)
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+ goto error_return;
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+ /*
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+ * Initialize the bmap freelist prior to calling either
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+ * bmapi or the directory create code.
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+ */
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+ xfs_bmap_init(&free_list, &first_block);
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+
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+ /*
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+ * Allocate an inode for the symlink.
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+ */
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+ error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
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+ prid, resblks > 0, &ip, NULL);
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+ if (error) {
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+ if (error == ENOSPC)
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+ goto error_return;
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+ goto error1;
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+ }
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+
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+ /*
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+ * An error after we've joined dp to the transaction will result in the
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+ * transaction cancel unlocking dp so don't do it explicitly in the
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+ * error path.
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+ */
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+ xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
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+ unlock_dp_on_error = false;
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+
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+ /*
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+ * Also attach the dquot(s) to it, if applicable.
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+ */
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+ xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
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+
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+ if (resblks)
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+ resblks -= XFS_IALLOC_SPACE_RES(mp);
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+ /*
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+ * If the symlink will fit into the inode, write it inline.
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+ */
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+ if (pathlen <= XFS_IFORK_DSIZE(ip)) {
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+ xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
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+ memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
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+ ip->i_d.di_size = pathlen;
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+
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+ /*
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+ * The inode was initially created in extent format.
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+ */
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+ ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
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+ ip->i_df.if_flags |= XFS_IFINLINE;
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+
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+ ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
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+ xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
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+
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+ } else {
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+ first_fsb = 0;
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+ nmaps = XFS_SYMLINK_MAPS;
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+
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+ error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
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+ XFS_BMAPI_METADATA, &first_block, resblks,
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+ mval, &nmaps, &free_list);
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+ if (error)
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+ goto error2;
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+
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+ if (resblks)
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+ resblks -= fs_blocks;
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+ ip->i_d.di_size = pathlen;
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+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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+
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+ cur_chunk = target_path;
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+ for (n = 0; n < nmaps; n++) {
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+ d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
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+ byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
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+ bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
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+ BTOBB(byte_cnt), 0);
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+ if (!bp) {
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+ error = ENOMEM;
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+ goto error2;
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+ }
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+ if (pathlen < byte_cnt) {
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+ byte_cnt = pathlen;
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+ }
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+ pathlen -= byte_cnt;
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+
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+ memcpy(bp->b_addr, cur_chunk, byte_cnt);
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+ cur_chunk += byte_cnt;
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+
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+ xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1);
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+ }
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+ }
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+
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+ /*
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+ * Create the directory entry for the symlink.
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+ */
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+ error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
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+ &first_block, &free_list, resblks);
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+ if (error)
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+ goto error2;
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+ xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
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+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
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+
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+ /*
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+ * If this is a synchronous mount, make sure that the
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+ * symlink transaction goes to disk before returning to
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+ * the user.
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+ */
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+ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
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+ xfs_trans_set_sync(tp);
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+ }
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+
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+ error = xfs_bmap_finish(&tp, &free_list, &committed);
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+ if (error) {
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+ goto error2;
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+ }
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+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
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+ xfs_qm_dqrele(udqp);
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+ xfs_qm_dqrele(gdqp);
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+
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+ *ipp = ip;
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+ return 0;
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+
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+ error2:
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+ IRELE(ip);
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+ error1:
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+ xfs_bmap_cancel(&free_list);
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+ cancel_flags |= XFS_TRANS_ABORT;
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+ error_return:
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+ xfs_trans_cancel(tp, cancel_flags);
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+ xfs_qm_dqrele(udqp);
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+ xfs_qm_dqrele(gdqp);
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+
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+ if (unlock_dp_on_error)
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+ xfs_iunlock(dp, XFS_ILOCK_EXCL);
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+ std_return:
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+ return error;
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+}
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+
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+/*
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+ * Free a symlink that has blocks associated with it.
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+ */
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+STATIC int
|
|
|
+xfs_inactive_symlink_rmt(
|
|
|
+ xfs_inode_t *ip,
|
|
|
+ xfs_trans_t **tpp)
|
|
|
+{
|
|
|
+ xfs_buf_t *bp;
|
|
|
+ int committed;
|
|
|
+ int done;
|
|
|
+ int error;
|
|
|
+ xfs_fsblock_t first_block;
|
|
|
+ xfs_bmap_free_t free_list;
|
|
|
+ int i;
|
|
|
+ xfs_mount_t *mp;
|
|
|
+ xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS];
|
|
|
+ int nmaps;
|
|
|
+ xfs_trans_t *ntp;
|
|
|
+ int size;
|
|
|
+ xfs_trans_t *tp;
|
|
|
+
|
|
|
+ tp = *tpp;
|
|
|
+ mp = ip->i_mount;
|
|
|
+ ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
|
|
|
+ /*
|
|
|
+ * We're freeing a symlink that has some
|
|
|
+ * blocks allocated to it. Free the
|
|
|
+ * blocks here. We know that we've got
|
|
|
+ * either 1 or 2 extents and that we can
|
|
|
+ * free them all in one bunmapi call.
|
|
|
+ */
|
|
|
+ ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Lock the inode, fix the size, and join it to the transaction.
|
|
|
+ * Hold it so in the normal path, we still have it locked for
|
|
|
+ * the second transaction. In the error paths we need it
|
|
|
+ * held so the cancel won't rele it, see below.
|
|
|
+ */
|
|
|
+ size = (int)ip->i_d.di_size;
|
|
|
+ ip->i_d.di_size = 0;
|
|
|
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
+ /*
|
|
|
+ * Find the block(s) so we can inval and unmap them.
|
|
|
+ */
|
|
|
+ done = 0;
|
|
|
+ xfs_bmap_init(&free_list, &first_block);
|
|
|
+ nmaps = ARRAY_SIZE(mval);
|
|
|
+ error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, size),
|
|
|
+ mval, &nmaps, 0);
|
|
|
+ if (error)
|
|
|
+ goto error0;
|
|
|
+ /*
|
|
|
+ * Invalidate the block(s).
|
|
|
+ */
|
|
|
+ for (i = 0; i < nmaps; i++) {
|
|
|
+ bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
|
|
|
+ XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
|
|
|
+ XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
|
|
|
+ if (!bp) {
|
|
|
+ error = ENOMEM;
|
|
|
+ goto error1;
|
|
|
+ }
|
|
|
+ xfs_trans_binval(tp, bp);
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * Unmap the dead block(s) to the free_list.
|
|
|
+ */
|
|
|
+ if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
|
|
|
+ &first_block, &free_list, &done)))
|
|
|
+ goto error1;
|
|
|
+ ASSERT(done);
|
|
|
+ /*
|
|
|
+ * Commit the first transaction. This logs the EFI and the inode.
|
|
|
+ */
|
|
|
+ if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
|
|
|
+ goto error1;
|
|
|
+ /*
|
|
|
+ * The transaction must have been committed, since there were
|
|
|
+ * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
|
|
|
+ * The new tp has the extent freeing and EFDs.
|
|
|
+ */
|
|
|
+ ASSERT(committed);
|
|
|
+ /*
|
|
|
+ * The first xact was committed, so add the inode to the new one.
|
|
|
+ * Mark it dirty so it will be logged and moved forward in the log as
|
|
|
+ * part of every commit.
|
|
|
+ */
|
|
|
+ xfs_trans_ijoin(tp, ip, 0);
|
|
|
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
+ /*
|
|
|
+ * Get a new, empty transaction to return to our caller.
|
|
|
+ */
|
|
|
+ ntp = xfs_trans_dup(tp);
|
|
|
+ /*
|
|
|
+ * Commit the transaction containing extent freeing and EFDs.
|
|
|
+ * If we get an error on the commit here or on the reserve below,
|
|
|
+ * we need to unlock the inode since the new transaction doesn't
|
|
|
+ * have the inode attached.
|
|
|
+ */
|
|
|
+ error = xfs_trans_commit(tp, 0);
|
|
|
+ tp = ntp;
|
|
|
+ if (error) {
|
|
|
+ ASSERT(XFS_FORCED_SHUTDOWN(mp));
|
|
|
+ goto error0;
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * transaction commit worked ok so we can drop the extra ticket
|
|
|
+ * reference that we gained in xfs_trans_dup()
|
|
|
+ */
|
|
|
+ xfs_log_ticket_put(tp->t_ticket);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Remove the memory for extent descriptions (just bookkeeping).
|
|
|
+ */
|
|
|
+ if (ip->i_df.if_bytes)
|
|
|
+ xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
|
|
|
+ ASSERT(ip->i_df.if_bytes == 0);
|
|
|
+ /*
|
|
|
+ * Put an itruncate log reservation in the new transaction
|
|
|
+ * for our caller.
|
|
|
+ */
|
|
|
+ if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
|
|
|
+ XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
|
|
|
+ ASSERT(XFS_FORCED_SHUTDOWN(mp));
|
|
|
+ goto error0;
|
|
|
+ }
|
|
|
+
|
|
|
+ xfs_trans_ijoin(tp, ip, 0);
|
|
|
+ *tpp = tp;
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ error1:
|
|
|
+ xfs_bmap_cancel(&free_list);
|
|
|
+ error0:
|
|
|
+ return error;
|
|
|
+}
|
Dave Chinner