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85c73bf726
Make it consistent with the other buffer APIs to return a error and the buffer is placed in a parameter. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
713 lines
17 KiB
C
713 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* Copyright (c) 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_fs.h"
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#include "xfs_shared.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_defer.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_inode.h"
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#include "xfs_trans.h"
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#include "xfs_bmap.h"
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#include "xfs_attr.h"
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#include "xfs_attr_remote.h"
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#include "xfs_trace.h"
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#include "xfs_error.h"
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#define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
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/*
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* Remote Attribute Values
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* =======================
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*
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* Remote extended attribute values are conceptually simple -- they're written
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* to data blocks mapped by an inode's attribute fork, and they have an upper
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* size limit of 64k. Setting a value does not involve the XFS log.
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*
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* However, on a v5 filesystem, maximally sized remote attr values require one
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* block more than 64k worth of space to hold both the remote attribute value
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* header (64 bytes). On a 4k block filesystem this results in a 68k buffer;
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* on a 64k block filesystem, this would be a 128k buffer. Note that the log
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* format can only handle a dirty buffer of XFS_MAX_BLOCKSIZE length (64k).
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* Therefore, we /must/ ensure that remote attribute value buffers never touch
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* the logging system and therefore never have a log item.
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*/
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/*
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* Each contiguous block has a header, so it is not just a simple attribute
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* length to FSB conversion.
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*/
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int
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xfs_attr3_rmt_blocks(
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struct xfs_mount *mp,
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int attrlen)
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{
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if (xfs_has_crc(mp)) {
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int buflen = XFS_ATTR3_RMT_BUF_SPACE(mp, mp->m_sb.sb_blocksize);
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return (attrlen + buflen - 1) / buflen;
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}
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return XFS_B_TO_FSB(mp, attrlen);
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}
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/*
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* Checking of the remote attribute header is split into two parts. The verifier
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* does CRC, location and bounds checking, the unpacking function checks the
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* attribute parameters and owner.
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*/
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static xfs_failaddr_t
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xfs_attr3_rmt_hdr_ok(
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void *ptr,
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xfs_ino_t ino,
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uint32_t offset,
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uint32_t size,
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xfs_daddr_t bno)
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{
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struct xfs_attr3_rmt_hdr *rmt = ptr;
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if (bno != be64_to_cpu(rmt->rm_blkno))
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return __this_address;
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if (offset != be32_to_cpu(rmt->rm_offset))
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return __this_address;
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if (size != be32_to_cpu(rmt->rm_bytes))
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return __this_address;
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if (ino != be64_to_cpu(rmt->rm_owner))
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return __this_address;
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/* ok */
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return NULL;
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}
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static xfs_failaddr_t
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xfs_attr3_rmt_verify(
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struct xfs_mount *mp,
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struct xfs_buf *bp,
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void *ptr,
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int fsbsize,
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xfs_daddr_t bno)
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{
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struct xfs_attr3_rmt_hdr *rmt = ptr;
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if (!xfs_verify_magic(bp, rmt->rm_magic))
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return __this_address;
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if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid))
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return __this_address;
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if (be64_to_cpu(rmt->rm_blkno) != bno)
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return __this_address;
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if (be32_to_cpu(rmt->rm_bytes) > fsbsize - sizeof(*rmt))
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return __this_address;
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if (be32_to_cpu(rmt->rm_offset) +
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be32_to_cpu(rmt->rm_bytes) > XFS_XATTR_SIZE_MAX)
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return __this_address;
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if (rmt->rm_owner == 0)
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return __this_address;
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return NULL;
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}
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static int
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__xfs_attr3_rmt_read_verify(
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struct xfs_buf *bp,
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bool check_crc,
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xfs_failaddr_t *failaddr)
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{
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struct xfs_mount *mp = bp->b_mount;
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char *ptr;
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int len;
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xfs_daddr_t bno;
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int blksize = mp->m_attr_geo->blksize;
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/* no verification of non-crc buffers */
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if (!xfs_has_crc(mp))
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return 0;
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ptr = bp->b_addr;
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bno = xfs_buf_daddr(bp);
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len = BBTOB(bp->b_length);
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ASSERT(len >= blksize);
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while (len > 0) {
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if (check_crc &&
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!xfs_verify_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF)) {
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*failaddr = __this_address;
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return -EFSBADCRC;
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}
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*failaddr = xfs_attr3_rmt_verify(mp, bp, ptr, blksize, bno);
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if (*failaddr)
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return -EFSCORRUPTED;
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len -= blksize;
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ptr += blksize;
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bno += BTOBB(blksize);
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}
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if (len != 0) {
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*failaddr = __this_address;
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return -EFSCORRUPTED;
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}
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return 0;
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}
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static void
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xfs_attr3_rmt_read_verify(
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struct xfs_buf *bp)
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{
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xfs_failaddr_t fa;
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int error;
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error = __xfs_attr3_rmt_read_verify(bp, true, &fa);
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if (error)
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xfs_verifier_error(bp, error, fa);
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}
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static xfs_failaddr_t
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xfs_attr3_rmt_verify_struct(
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struct xfs_buf *bp)
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{
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xfs_failaddr_t fa;
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int error;
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error = __xfs_attr3_rmt_read_verify(bp, false, &fa);
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return error ? fa : NULL;
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}
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static void
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xfs_attr3_rmt_write_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_mount;
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xfs_failaddr_t fa;
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int blksize = mp->m_attr_geo->blksize;
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char *ptr;
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int len;
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xfs_daddr_t bno;
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/* no verification of non-crc buffers */
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if (!xfs_has_crc(mp))
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return;
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ptr = bp->b_addr;
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bno = xfs_buf_daddr(bp);
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len = BBTOB(bp->b_length);
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ASSERT(len >= blksize);
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while (len > 0) {
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struct xfs_attr3_rmt_hdr *rmt = (struct xfs_attr3_rmt_hdr *)ptr;
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fa = xfs_attr3_rmt_verify(mp, bp, ptr, blksize, bno);
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if (fa) {
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xfs_verifier_error(bp, -EFSCORRUPTED, fa);
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return;
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}
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/*
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* Ensure we aren't writing bogus LSNs to disk. See
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* xfs_attr3_rmt_hdr_set() for the explanation.
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*/
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if (rmt->rm_lsn != cpu_to_be64(NULLCOMMITLSN)) {
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xfs_verifier_error(bp, -EFSCORRUPTED, __this_address);
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return;
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}
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xfs_update_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF);
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len -= blksize;
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ptr += blksize;
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bno += BTOBB(blksize);
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}
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if (len != 0)
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xfs_verifier_error(bp, -EFSCORRUPTED, __this_address);
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}
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const struct xfs_buf_ops xfs_attr3_rmt_buf_ops = {
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.name = "xfs_attr3_rmt",
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.magic = { 0, cpu_to_be32(XFS_ATTR3_RMT_MAGIC) },
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.verify_read = xfs_attr3_rmt_read_verify,
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.verify_write = xfs_attr3_rmt_write_verify,
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.verify_struct = xfs_attr3_rmt_verify_struct,
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};
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STATIC int
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xfs_attr3_rmt_hdr_set(
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struct xfs_mount *mp,
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void *ptr,
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xfs_ino_t ino,
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uint32_t offset,
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uint32_t size,
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xfs_daddr_t bno)
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{
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struct xfs_attr3_rmt_hdr *rmt = ptr;
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if (!xfs_has_crc(mp))
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return 0;
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rmt->rm_magic = cpu_to_be32(XFS_ATTR3_RMT_MAGIC);
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rmt->rm_offset = cpu_to_be32(offset);
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rmt->rm_bytes = cpu_to_be32(size);
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uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid);
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rmt->rm_owner = cpu_to_be64(ino);
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rmt->rm_blkno = cpu_to_be64(bno);
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/*
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* Remote attribute blocks are written synchronously, so we don't
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* have an LSN that we can stamp in them that makes any sense to log
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* recovery. To ensure that log recovery handles overwrites of these
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* blocks sanely (i.e. once they've been freed and reallocated as some
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* other type of metadata) we need to ensure that the LSN has a value
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* that tells log recovery to ignore the LSN and overwrite the buffer
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* with whatever is in it's log. To do this, we use the magic
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* NULLCOMMITLSN to indicate that the LSN is invalid.
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*/
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rmt->rm_lsn = cpu_to_be64(NULLCOMMITLSN);
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return sizeof(struct xfs_attr3_rmt_hdr);
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}
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/*
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* Helper functions to copy attribute data in and out of the one disk extents
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*/
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STATIC int
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xfs_attr_rmtval_copyout(
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struct xfs_mount *mp,
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struct xfs_buf *bp,
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xfs_ino_t ino,
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int *offset,
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int *valuelen,
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uint8_t **dst)
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{
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char *src = bp->b_addr;
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xfs_daddr_t bno = xfs_buf_daddr(bp);
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int len = BBTOB(bp->b_length);
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int blksize = mp->m_attr_geo->blksize;
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ASSERT(len >= blksize);
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while (len > 0 && *valuelen > 0) {
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int hdr_size = 0;
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int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize);
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byte_cnt = min(*valuelen, byte_cnt);
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if (xfs_has_crc(mp)) {
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if (xfs_attr3_rmt_hdr_ok(src, ino, *offset,
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byte_cnt, bno)) {
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xfs_alert(mp,
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"remote attribute header mismatch bno/off/len/owner (0x%llx/0x%x/Ox%x/0x%llx)",
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bno, *offset, byte_cnt, ino);
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return -EFSCORRUPTED;
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}
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hdr_size = sizeof(struct xfs_attr3_rmt_hdr);
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}
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memcpy(*dst, src + hdr_size, byte_cnt);
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/* roll buffer forwards */
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len -= blksize;
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src += blksize;
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bno += BTOBB(blksize);
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/* roll attribute data forwards */
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*valuelen -= byte_cnt;
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*dst += byte_cnt;
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*offset += byte_cnt;
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}
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return 0;
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}
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STATIC void
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xfs_attr_rmtval_copyin(
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struct xfs_mount *mp,
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struct xfs_buf *bp,
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xfs_ino_t ino,
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int *offset,
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int *valuelen,
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uint8_t **src)
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{
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char *dst = bp->b_addr;
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xfs_daddr_t bno = xfs_buf_daddr(bp);
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int len = BBTOB(bp->b_length);
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int blksize = mp->m_attr_geo->blksize;
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ASSERT(len >= blksize);
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while (len > 0 && *valuelen > 0) {
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int hdr_size;
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int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize);
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byte_cnt = min(*valuelen, byte_cnt);
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hdr_size = xfs_attr3_rmt_hdr_set(mp, dst, ino, *offset,
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byte_cnt, bno);
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memcpy(dst + hdr_size, *src, byte_cnt);
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/*
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* If this is the last block, zero the remainder of it.
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* Check that we are actually the last block, too.
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*/
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if (byte_cnt + hdr_size < blksize) {
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ASSERT(*valuelen - byte_cnt == 0);
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ASSERT(len == blksize);
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memset(dst + hdr_size + byte_cnt, 0,
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blksize - hdr_size - byte_cnt);
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}
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/* roll buffer forwards */
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len -= blksize;
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dst += blksize;
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bno += BTOBB(blksize);
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/* roll attribute data forwards */
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*valuelen -= byte_cnt;
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*src += byte_cnt;
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*offset += byte_cnt;
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}
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}
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/*
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* Read the value associated with an attribute from the out-of-line buffer
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* that we stored it in.
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*
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* Returns 0 on successful retrieval, otherwise an error.
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*/
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int
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xfs_attr_rmtval_get(
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struct xfs_da_args *args)
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{
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struct xfs_bmbt_irec map[ATTR_RMTVALUE_MAPSIZE];
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struct xfs_mount *mp = args->dp->i_mount;
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struct xfs_buf *bp;
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xfs_dablk_t lblkno = args->rmtblkno;
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uint8_t *dst = args->value;
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int valuelen;
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int nmap;
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int error;
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int blkcnt = args->rmtblkcnt;
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int i;
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int offset = 0;
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trace_xfs_attr_rmtval_get(args);
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ASSERT(args->valuelen != 0);
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ASSERT(args->rmtvaluelen == args->valuelen);
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valuelen = args->rmtvaluelen;
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while (valuelen > 0) {
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nmap = ATTR_RMTVALUE_MAPSIZE;
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error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
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blkcnt, map, &nmap,
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XFS_BMAPI_ATTRFORK);
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if (error)
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return error;
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ASSERT(nmap >= 1);
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for (i = 0; (i < nmap) && (valuelen > 0); i++) {
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xfs_daddr_t dblkno;
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int dblkcnt;
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ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
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(map[i].br_startblock != HOLESTARTBLOCK));
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dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
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dblkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
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error = xfs_buf_read(mp->m_ddev_targp, dblkno, dblkcnt,
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0, &bp, &xfs_attr3_rmt_buf_ops);
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if (error)
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return error;
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error = xfs_attr_rmtval_copyout(mp, bp, args->dp->i_ino,
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&offset, &valuelen,
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&dst);
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xfs_buf_relse(bp);
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if (error)
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return error;
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/* roll attribute extent map forwards */
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lblkno += map[i].br_blockcount;
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blkcnt -= map[i].br_blockcount;
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}
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}
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ASSERT(valuelen == 0);
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return 0;
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}
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/*
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* Find a "hole" in the attribute address space large enough for us to drop the
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* new attributes value into
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*/
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int
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xfs_attr_rmt_find_hole(
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struct xfs_da_args *args)
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{
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struct xfs_inode *dp = args->dp;
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struct xfs_mount *mp = dp->i_mount;
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int error;
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int blkcnt;
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xfs_fileoff_t lfileoff = 0;
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/*
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* Because CRC enable attributes have headers, we can't just do a
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* straight byte to FSB conversion and have to take the header space
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* into account.
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*/
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blkcnt = xfs_attr3_rmt_blocks(mp, args->rmtvaluelen);
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error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
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XFS_ATTR_FORK);
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if (error)
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return error;
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args->rmtblkno = (xfs_dablk_t)lfileoff;
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args->rmtblkcnt = blkcnt;
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return 0;
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}
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int
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xfs_attr_rmtval_set_value(
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struct xfs_da_args *args)
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{
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struct xfs_inode *dp = args->dp;
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struct xfs_mount *mp = dp->i_mount;
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struct xfs_bmbt_irec map;
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xfs_dablk_t lblkno;
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uint8_t *src = args->value;
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int blkcnt;
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int valuelen;
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int nmap;
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int error;
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int offset = 0;
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/*
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* Roll through the "value", copying the attribute value to the
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* already-allocated blocks. Blocks are written synchronously
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* so that we can know they are all on disk before we turn off
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* the INCOMPLETE flag.
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*/
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lblkno = args->rmtblkno;
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blkcnt = args->rmtblkcnt;
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valuelen = args->rmtvaluelen;
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while (valuelen > 0) {
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struct xfs_buf *bp;
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xfs_daddr_t dblkno;
|
|
int dblkcnt;
|
|
|
|
ASSERT(blkcnt > 0);
|
|
|
|
nmap = 1;
|
|
error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno,
|
|
blkcnt, &map, &nmap,
|
|
XFS_BMAPI_ATTRFORK);
|
|
if (error)
|
|
return error;
|
|
ASSERT(nmap == 1);
|
|
ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
|
|
(map.br_startblock != HOLESTARTBLOCK));
|
|
|
|
dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
|
|
dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
|
|
|
|
error = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt, &bp);
|
|
if (error)
|
|
return error;
|
|
bp->b_ops = &xfs_attr3_rmt_buf_ops;
|
|
|
|
xfs_attr_rmtval_copyin(mp, bp, args->dp->i_ino, &offset,
|
|
&valuelen, &src);
|
|
|
|
error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */
|
|
xfs_buf_relse(bp);
|
|
if (error)
|
|
return error;
|
|
|
|
|
|
/* roll attribute extent map forwards */
|
|
lblkno += map.br_blockcount;
|
|
blkcnt -= map.br_blockcount;
|
|
}
|
|
ASSERT(valuelen == 0);
|
|
return 0;
|
|
}
|
|
|
|
/* Mark stale any incore buffers for the remote value. */
|
|
int
|
|
xfs_attr_rmtval_stale(
|
|
struct xfs_inode *ip,
|
|
struct xfs_bmbt_irec *map,
|
|
xfs_buf_flags_t incore_flags)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_buf *bp;
|
|
int error;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
|
|
if (XFS_IS_CORRUPT(mp, map->br_startblock == DELAYSTARTBLOCK) ||
|
|
XFS_IS_CORRUPT(mp, map->br_startblock == HOLESTARTBLOCK))
|
|
return -EFSCORRUPTED;
|
|
|
|
error = xfs_buf_incore(mp->m_ddev_targp,
|
|
XFS_FSB_TO_DADDR(mp, map->br_startblock),
|
|
XFS_FSB_TO_BB(mp, map->br_blockcount),
|
|
incore_flags, &bp);
|
|
if (error) {
|
|
if (error == -ENOENT)
|
|
return 0;
|
|
return error;
|
|
}
|
|
|
|
xfs_buf_stale(bp);
|
|
xfs_buf_relse(bp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Find a hole for the attr and store it in the delayed attr context. This
|
|
* initializes the context to roll through allocating an attr extent for a
|
|
* delayed attr operation
|
|
*/
|
|
int
|
|
xfs_attr_rmtval_find_space(
|
|
struct xfs_attr_intent *attr)
|
|
{
|
|
struct xfs_da_args *args = attr->xattri_da_args;
|
|
struct xfs_bmbt_irec *map = &attr->xattri_map;
|
|
int error;
|
|
|
|
attr->xattri_lblkno = 0;
|
|
attr->xattri_blkcnt = 0;
|
|
args->rmtblkcnt = 0;
|
|
args->rmtblkno = 0;
|
|
memset(map, 0, sizeof(struct xfs_bmbt_irec));
|
|
|
|
error = xfs_attr_rmt_find_hole(args);
|
|
if (error)
|
|
return error;
|
|
|
|
attr->xattri_blkcnt = args->rmtblkcnt;
|
|
attr->xattri_lblkno = args->rmtblkno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Write one block of the value associated with an attribute into the
|
|
* out-of-line buffer that we have defined for it. This is similar to a subset
|
|
* of xfs_attr_rmtval_set, but records the current block to the delayed attr
|
|
* context, and leaves transaction handling to the caller.
|
|
*/
|
|
int
|
|
xfs_attr_rmtval_set_blk(
|
|
struct xfs_attr_intent *attr)
|
|
{
|
|
struct xfs_da_args *args = attr->xattri_da_args;
|
|
struct xfs_inode *dp = args->dp;
|
|
struct xfs_bmbt_irec *map = &attr->xattri_map;
|
|
int nmap;
|
|
int error;
|
|
|
|
nmap = 1;
|
|
error = xfs_bmapi_write(args->trans, dp,
|
|
(xfs_fileoff_t)attr->xattri_lblkno,
|
|
attr->xattri_blkcnt, XFS_BMAPI_ATTRFORK, args->total,
|
|
map, &nmap);
|
|
if (error)
|
|
return error;
|
|
|
|
ASSERT(nmap == 1);
|
|
ASSERT((map->br_startblock != DELAYSTARTBLOCK) &&
|
|
(map->br_startblock != HOLESTARTBLOCK));
|
|
|
|
/* roll attribute extent map forwards */
|
|
attr->xattri_lblkno += map->br_blockcount;
|
|
attr->xattri_blkcnt -= map->br_blockcount;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Remove the value associated with an attribute by deleting the
|
|
* out-of-line buffer that it is stored on.
|
|
*/
|
|
int
|
|
xfs_attr_rmtval_invalidate(
|
|
struct xfs_da_args *args)
|
|
{
|
|
xfs_dablk_t lblkno;
|
|
int blkcnt;
|
|
int error;
|
|
|
|
/*
|
|
* Roll through the "value", invalidating the attribute value's blocks.
|
|
*/
|
|
lblkno = args->rmtblkno;
|
|
blkcnt = args->rmtblkcnt;
|
|
while (blkcnt > 0) {
|
|
struct xfs_bmbt_irec map;
|
|
int nmap;
|
|
|
|
/*
|
|
* Try to remember where we decided to put the value.
|
|
*/
|
|
nmap = 1;
|
|
error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
|
|
blkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(args->dp->i_mount, nmap != 1))
|
|
return -EFSCORRUPTED;
|
|
error = xfs_attr_rmtval_stale(args->dp, &map, XBF_TRYLOCK);
|
|
if (error)
|
|
return error;
|
|
|
|
lblkno += map.br_blockcount;
|
|
blkcnt -= map.br_blockcount;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Remove the value associated with an attribute by deleting the out-of-line
|
|
* buffer that it is stored on. Returns -EAGAIN for the caller to refresh the
|
|
* transaction and re-call the function. Callers should keep calling this
|
|
* routine until it returns something other than -EAGAIN.
|
|
*/
|
|
int
|
|
xfs_attr_rmtval_remove(
|
|
struct xfs_attr_intent *attr)
|
|
{
|
|
struct xfs_da_args *args = attr->xattri_da_args;
|
|
int error, done;
|
|
|
|
/*
|
|
* Unmap value blocks for this attr.
|
|
*/
|
|
error = xfs_bunmapi(args->trans, args->dp, args->rmtblkno,
|
|
args->rmtblkcnt, XFS_BMAPI_ATTRFORK, 1, &done);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* We don't need an explicit state here to pick up where we left off. We
|
|
* can figure it out using the !done return code. The actual value of
|
|
* attr->xattri_dela_state may be some value reminiscent of the calling
|
|
* function, but it's value is irrelevant with in the context of this
|
|
* function. Once we are done here, the next state is set as needed by
|
|
* the parent
|
|
*/
|
|
if (!done) {
|
|
trace_xfs_attr_rmtval_remove_return(attr->xattri_dela_state,
|
|
args->dp);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
args->rmtblkno = 0;
|
|
args->rmtblkcnt = 0;
|
|
return 0;
|
|
}
|