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712 lines
17 KiB
712 lines
17 KiB
// 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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|
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#define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */ |
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|
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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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/* |
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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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/* |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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/* |
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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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/* |
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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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|
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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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/* |
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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; |
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int dblkcnt; |
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|
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ASSERT(blkcnt > 0); |
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|
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nmap = 1; |
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error = xfs_bmapi_read(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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ASSERT((map.br_startblock != DELAYSTARTBLOCK) && |
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(map.br_startblock != HOLESTARTBLOCK)); |
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|
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dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), |
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dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); |
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|
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error = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt, &bp); |
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if (error) |
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return error; |
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bp->b_ops = &xfs_attr3_rmt_buf_ops; |
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|
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xfs_attr_rmtval_copyin(mp, bp, args->dp->i_ino, &offset, |
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&valuelen, &src); |
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|
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error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */ |
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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.br_blockcount; |
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blkcnt -= map.br_blockcount; |
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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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/* Mark stale any incore buffers for the remote value. */ |
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int |
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xfs_attr_rmtval_stale( |
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struct xfs_inode *ip, |
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struct xfs_bmbt_irec *map, |
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xfs_buf_flags_t incore_flags) |
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{ |
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struct xfs_mount *mp = ip->i_mount; |
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struct xfs_buf *bp; |
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int error; |
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|
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ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
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|
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if (XFS_IS_CORRUPT(mp, map->br_startblock == DELAYSTARTBLOCK) || |
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XFS_IS_CORRUPT(mp, map->br_startblock == HOLESTARTBLOCK)) |
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return -EFSCORRUPTED; |
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|
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error = xfs_buf_incore(mp->m_ddev_targp, |
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XFS_FSB_TO_DADDR(mp, map->br_startblock), |
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XFS_FSB_TO_BB(mp, map->br_blockcount), |
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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; |
|
}
|
|
|