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![Brian Foster](/assets/img/avatar_default.png)
Inodes that are held across deferred operations are explicitly joined to the dfops structure to ensure appropriate relogging. While inodes are currently joined explicitly, we can detect the conditions that require relogging at dfops finish time by inspecting the transaction item list for inodes with ili_lock_flags == 0. Replace the xfs_defer_ijoin() infrastructure with such detection and automatic relogging of held inodes. This eliminates the need for the per-dfops inode list, replaced by an on-stack variant in xfs_defer_trans_roll(). Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
528 lines
12 KiB
C
528 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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#include "xfs.h"
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#include "xfs_shared.h"
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#include "xfs_fs.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_mount.h"
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#include "xfs_da_format.h"
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#include "xfs_da_btree.h"
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#include "xfs_defer.h"
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#include "xfs_dir2.h"
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#include "xfs_inode.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_bmap_btree.h"
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#include "xfs_bmap_util.h"
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#include "xfs_error.h"
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#include "xfs_quota.h"
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#include "xfs_trans_space.h"
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#include "xfs_trace.h"
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#include "xfs_symlink.h"
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#include "xfs_trans.h"
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#include "xfs_log.h"
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/* ----- Kernel only functions below ----- */
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int
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xfs_readlink_bmap_ilocked(
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struct xfs_inode *ip,
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char *link)
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{
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
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struct xfs_buf *bp;
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xfs_daddr_t d;
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char *cur_chunk;
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int pathlen = ip->i_d.di_size;
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int nmaps = XFS_SYMLINK_MAPS;
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int byte_cnt;
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int n;
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int error = 0;
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int fsblocks = 0;
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int offset;
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ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
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fsblocks = xfs_symlink_blocks(mp, pathlen);
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error = xfs_bmapi_read(ip, 0, fsblocks, mval, &nmaps, 0);
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if (error)
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goto out;
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offset = 0;
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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_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0,
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&xfs_symlink_buf_ops);
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if (!bp)
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return -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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/* bad CRC means corrupted metadata */
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if (error == -EFSBADCRC)
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error = -EFSCORRUPTED;
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goto out;
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}
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byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
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if (pathlen < byte_cnt)
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byte_cnt = pathlen;
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cur_chunk = bp->b_addr;
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if (xfs_sb_version_hascrc(&mp->m_sb)) {
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if (!xfs_symlink_hdr_ok(ip->i_ino, offset,
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byte_cnt, bp)) {
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error = -EFSCORRUPTED;
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xfs_alert(mp,
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"symlink header does not match required off/len/owner (0x%x/Ox%x,0x%llx)",
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offset, byte_cnt, ip->i_ino);
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xfs_buf_relse(bp);
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goto out;
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}
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cur_chunk += sizeof(struct xfs_dsymlink_hdr);
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}
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memcpy(link + offset, cur_chunk, byte_cnt);
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pathlen -= byte_cnt;
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offset += byte_cnt;
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xfs_buf_relse(bp);
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}
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ASSERT(pathlen == 0);
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link[ip->i_d.di_size] = '\0';
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error = 0;
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out:
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return error;
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}
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int
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xfs_readlink(
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struct xfs_inode *ip,
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char *link)
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{
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struct xfs_mount *mp = ip->i_mount;
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xfs_fsize_t pathlen;
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int error = 0;
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trace_xfs_readlink(ip);
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ASSERT(!(ip->i_df.if_flags & XFS_IFINLINE));
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if (XFS_FORCED_SHUTDOWN(mp))
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return -EIO;
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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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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if (pathlen < 0 || pathlen > XFS_SYMLINK_MAXLEN) {
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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 = -EFSCORRUPTED;
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goto out;
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}
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error = xfs_readlink_bmap_ilocked(ip, link);
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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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int
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xfs_symlink(
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struct xfs_inode *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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struct xfs_inode **ipp)
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{
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struct xfs_mount *mp = dp->i_mount;
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struct xfs_trans *tp = NULL;
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struct xfs_inode *ip = NULL;
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int error = 0;
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int pathlen;
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bool unlock_dp_on_error = false;
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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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struct xfs_bmbt_irec 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 = NULL;
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struct xfs_dquot *gdqp = NULL;
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struct xfs_dquot *pdqp = NULL;
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uint resblks;
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*ipp = NULL;
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trace_xfs_symlink(dp, link_name);
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if (XFS_FORCED_SHUTDOWN(mp))
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return -EIO;
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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 >= XFS_SYMLINK_MAXLEN) /* total string too long */
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return -ENAMETOOLONG;
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udqp = gdqp = NULL;
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prid = xfs_get_initial_prid(dp);
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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,
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xfs_kuid_to_uid(current_fsuid()),
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xfs_kgid_to_gid(current_fsgid()), prid,
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XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
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&udqp, &gdqp, &pdqp);
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if (error)
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return error;
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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_symlink_blocks(mp, pathlen);
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resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_symlink, resblks, 0, 0, &tp);
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if (error)
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goto out_release_inode;
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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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* 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 = -EPERM;
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goto out_trans_cancel;
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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,
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pdqp, resblks, 1, 0);
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if (error)
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goto out_trans_cancel;
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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, &ip);
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if (error)
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goto out_trans_cancel;
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/*
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* Now we join the directory inode to the transaction. We do not do it
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* earlier because xfs_dir_ialloc might commit the previous transaction
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* (and release all the locks). An error from here on will result in
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* the 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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* 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, pdqp);
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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_init_local_fork(ip, XFS_DATA_FORK, target_path, pathlen);
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ip->i_d.di_size = pathlen;
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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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} else {
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int offset;
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first_fsb = 0;
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nmaps = XFS_SYMLINK_MAPS;
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error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
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XFS_BMAPI_METADATA, resblks, mval, &nmaps);
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if (error)
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goto out_trans_cancel;
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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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cur_chunk = target_path;
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offset = 0;
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for (n = 0; n < nmaps; n++) {
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char *buf;
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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 out_trans_cancel;
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}
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bp->b_ops = &xfs_symlink_buf_ops;
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byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
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byte_cnt = min(byte_cnt, pathlen);
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buf = bp->b_addr;
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buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset,
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byte_cnt, bp);
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memcpy(buf, cur_chunk, byte_cnt);
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cur_chunk += byte_cnt;
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pathlen -= byte_cnt;
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offset += byte_cnt;
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xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);
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xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) -
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(char *)bp->b_addr);
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}
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ASSERT(pathlen == 0);
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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, resblks);
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if (error)
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goto out_trans_cancel;
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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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* 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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error = xfs_trans_commit(tp);
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if (error)
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goto out_release_inode;
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xfs_qm_dqrele(udqp);
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xfs_qm_dqrele(gdqp);
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xfs_qm_dqrele(pdqp);
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*ipp = ip;
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return 0;
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out_trans_cancel:
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xfs_trans_cancel(tp);
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out_release_inode:
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/*
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* Wait until after the current transaction is aborted to finish the
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* setup of the inode and release the inode. This prevents recursive
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* transactions and deadlocks from xfs_inactive.
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*/
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if (ip) {
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xfs_finish_inode_setup(ip);
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xfs_irele(ip);
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}
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xfs_qm_dqrele(udqp);
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xfs_qm_dqrele(gdqp);
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xfs_qm_dqrele(pdqp);
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if (unlock_dp_on_error)
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xfs_iunlock(dp, XFS_ILOCK_EXCL);
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return error;
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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
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xfs_inactive_symlink_rmt(
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struct xfs_inode *ip)
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{
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xfs_buf_t *bp;
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int done;
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int error;
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int i;
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xfs_mount_t *mp;
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xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS];
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int nmaps;
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int size;
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xfs_trans_t *tp;
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mp = ip->i_mount;
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ASSERT(ip->i_df.if_flags & XFS_IFEXTENTS);
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/*
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* We're freeing a symlink that has some
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* blocks allocated to it. Free the
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* blocks here. We know that we've got
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* either 1 or 2 extents and that we can
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* free them all in one bunmapi call.
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*/
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ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
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if (error)
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return error;
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, ip, 0);
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/*
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* Lock the inode, fix the size, and join it to the transaction.
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* Hold it so in the normal path, we still have it locked for
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* the second transaction. In the error paths we need it
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* held so the cancel won't rele it, see below.
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*/
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size = (int)ip->i_d.di_size;
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ip->i_d.di_size = 0;
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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/*
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* Find the block(s) so we can inval and unmap them.
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*/
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done = 0;
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nmaps = ARRAY_SIZE(mval);
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error = xfs_bmapi_read(ip, 0, xfs_symlink_blocks(mp, size),
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mval, &nmaps, 0);
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if (error)
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goto error_trans_cancel;
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/*
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* Invalidate the block(s). No validation is done.
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*/
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for (i = 0; i < nmaps; i++) {
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bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
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XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
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XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
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if (!bp) {
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error = -ENOMEM;
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goto error_trans_cancel;
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}
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xfs_trans_binval(tp, bp);
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}
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/*
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* Unmap the dead block(s) to the dfops.
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*/
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error = xfs_bunmapi(tp, ip, 0, size, 0, nmaps, &done);
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if (error)
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goto error_trans_cancel;
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ASSERT(done);
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/*
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* Commit the transaction. This first logs the EFI and the inode, then
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* rolls and commits the transaction that frees the extents.
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*/
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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error = xfs_trans_commit(tp);
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if (error) {
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ASSERT(XFS_FORCED_SHUTDOWN(mp));
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goto error_unlock;
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}
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/*
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* Remove the memory for extent descriptions (just bookkeeping).
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*/
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if (ip->i_df.if_bytes)
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xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
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ASSERT(ip->i_df.if_bytes == 0);
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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return 0;
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error_trans_cancel:
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xfs_trans_cancel(tp);
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error_unlock:
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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return error;
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}
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/*
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* xfs_inactive_symlink - free a symlink
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*/
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int
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xfs_inactive_symlink(
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struct xfs_inode *ip)
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{
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struct xfs_mount *mp = ip->i_mount;
|
|
int pathlen;
|
|
|
|
trace_xfs_inactive_symlink(ip);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return -EIO;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
|
|
/*
|
|
* Zero length symlinks _can_ exist.
|
|
*/
|
|
pathlen = (int)ip->i_d.di_size;
|
|
if (!pathlen) {
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return 0;
|
|
}
|
|
|
|
if (pathlen < 0 || pathlen > XFS_SYMLINK_MAXLEN) {
|
|
xfs_alert(mp, "%s: inode (0x%llx) bad symlink length (%d)",
|
|
__func__, (unsigned long long)ip->i_ino, pathlen);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
ASSERT(0);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
if (ip->i_df.if_flags & XFS_IFINLINE) {
|
|
if (ip->i_df.if_bytes > 0)
|
|
xfs_idata_realloc(ip, -(ip->i_df.if_bytes),
|
|
XFS_DATA_FORK);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
ASSERT(ip->i_df.if_bytes == 0);
|
|
return 0;
|
|
}
|
|
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
|
|
/* remove the remote symlink */
|
|
return xfs_inactive_symlink_rmt(ip);
|
|
}
|