Release 4.18 fs/xfs/libxfs/xfs_symlink_remote.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
* Copyright (c) 2012-2013 Red Hat, Inc.
* All rights reserved.
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_shared.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_inode.h"
#include "xfs_error.h"
#include "xfs_trace.h"
#include "xfs_symlink.h"
#include "xfs_cksum.h"
#include "xfs_trans.h"
#include "xfs_buf_item.h"
#include "xfs_log.h"
/*
* Each contiguous block has a header, so it is not just a simple pathlen
* to FSB conversion.
*/
int
xfs_symlink_blocks(
struct xfs_mount *mp,
int pathlen)
{
int buflen = XFS_SYMLINK_BUF_SPACE(mp, mp->m_sb.sb_blocksize);
return (pathlen + buflen - 1) / buflen;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Chinner | 38 | 100.00% | 1 | 100.00% |
| Total | 38 | 100.00% | 1 | 100.00% |
int
xfs_symlink_hdr_set(
struct xfs_mount *mp,
xfs_ino_t ino,
uint32_t offset,
uint32_t size,
struct xfs_buf *bp)
{
struct xfs_dsymlink_hdr *dsl = bp->b_addr;
if (!xfs_sb_version_hascrc(&mp->m_sb))
return 0;
memset(dsl, 0, sizeof(struct xfs_dsymlink_hdr));
dsl->sl_magic = cpu_to_be32(XFS_SYMLINK_MAGIC);
dsl->sl_offset = cpu_to_be32(offset);
dsl->sl_bytes = cpu_to_be32(size);
uuid_copy(&dsl->sl_uuid, &mp->m_sb.sb_meta_uuid);
dsl->sl_owner = cpu_to_be64(ino);
dsl->sl_blkno = cpu_to_be64(bp->b_bn);
bp->b_ops = &xfs_symlink_buf_ops;
return sizeof(struct xfs_dsymlink_hdr);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Chinner | 122 | 89.71% | 1 | 33.33% |
| Brian Foster | 13 | 9.56% | 1 | 33.33% |
| Eric Sandeen | 1 | 0.74% | 1 | 33.33% |
| Total | 136 | 100.00% | 3 | 100.00% |
/*
* Checking of the symlink header is split into two parts. the verifier does
* CRC, location and bounds checking, the unpacking function checks the path
* parameters and owner.
*/
bool
xfs_symlink_hdr_ok(
xfs_ino_t ino,
uint32_t offset,
uint32_t size,
struct xfs_buf *bp)
{
struct xfs_dsymlink_hdr *dsl = bp->b_addr;
if (offset != be32_to_cpu(dsl->sl_offset))
return false;
if (size != be32_to_cpu(dsl->sl_bytes))
return false;
if (ino != be64_to_cpu(dsl->sl_owner))
return false;
/* ok */
return true;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Chinner | 74 | 100.00% | 1 | 100.00% |
| Total | 74 | 100.00% | 1 | 100.00% |
static xfs_failaddr_t
xfs_symlink_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_dsymlink_hdr *dsl = bp->b_addr;
if (!xfs_sb_version_hascrc(&mp->m_sb))
return __this_address;
if (dsl->sl_magic != cpu_to_be32(XFS_SYMLINK_MAGIC))
return __this_address;
if (!uuid_equal(&dsl->sl_uuid, &mp->m_sb.sb_meta_uuid))
return __this_address;
if (bp->b_bn != be64_to_cpu(dsl->sl_blkno))
return __this_address;
if (be32_to_cpu(dsl->sl_offset) +
be32_to_cpu(dsl->sl_bytes) >= XFS_SYMLINK_MAXLEN)
return __this_address;
if (dsl->sl_owner == 0)
return __this_address;
if (!xfs_log_check_lsn(mp, be64_to_cpu(dsl->sl_lsn)))
return __this_address;
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Chinner | 121 | 81.21% | 1 | 20.00% |
| Brian Foster | 17 | 11.41% | 1 | 20.00% |
| Darrick J. Wong | 10 | 6.71% | 2 | 40.00% |
| Eric Sandeen | 1 | 0.67% | 1 | 20.00% |
| Total | 149 | 100.00% | 5 | 100.00% |
static void
xfs_symlink_read_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
xfs_failaddr_t fa;
/* no verification of non-crc buffers */
if (!xfs_sb_version_hascrc(&mp->m_sb))
return;
if (!xfs_buf_verify_cksum(bp, XFS_SYMLINK_CRC_OFF))
xfs_verifier_error(bp, -EFSBADCRC, __this_address);
else {
fa = xfs_symlink_verify(bp);
if (fa)
xfs_verifier_error(bp, -EFSCORRUPTED, fa);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Chinner | 53 | 64.63% | 2 | 28.57% |
| Darrick J. Wong | 18 | 21.95% | 2 | 28.57% |
| Eric Sandeen | 11 | 13.41% | 3 | 42.86% |
| Total | 82 | 100.00% | 7 | 100.00% |
static void
xfs_symlink_write_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_buf_log_item *bip = bp->b_log_item;
xfs_failaddr_t fa;
/* no verification of non-crc buffers */
if (!xfs_sb_version_hascrc(&mp->m_sb))
return;
fa = xfs_symlink_verify(bp);
if (fa) {
xfs_verifier_error(bp, -EFSCORRUPTED, fa);
return;
}
if (bip) {
struct xfs_dsymlink_hdr *dsl = bp->b_addr;
dsl->sl_lsn = cpu_to_be64(bip->bli_item.li_lsn);
}
xfs_buf_update_cksum(bp, XFS_SYMLINK_CRC_OFF);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Chinner | 89 | 83.96% | 2 | 25.00% |
| Darrick J. Wong | 12 | 11.32% | 2 | 25.00% |
| Eric Sandeen | 4 | 3.77% | 3 | 37.50% |
| Carlos Maiolino | 1 | 0.94% | 1 | 12.50% |
| Total | 106 | 100.00% | 8 | 100.00% |
const struct xfs_buf_ops xfs_symlink_buf_ops = {
.name = "xfs_symlink",
.verify_read = xfs_symlink_read_verify,
.verify_write = xfs_symlink_write_verify,
.verify_struct = xfs_symlink_verify,
};
void
xfs_symlink_local_to_remote(
struct xfs_trans *tp,
struct xfs_buf *bp,
struct xfs_inode *ip,
struct xfs_ifork *ifp)
{
struct xfs_mount *mp = ip->i_mount;
char *buf;
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);
if (!xfs_sb_version_hascrc(&mp->m_sb)) {
bp->b_ops = NULL;
memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes);
xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
return;
}
/*
* As this symlink fits in an inode literal area, it must also fit in
* the smallest buffer the filesystem supports.
*/
ASSERT(BBTOB(bp->b_length) >=
ifp->if_bytes + sizeof(struct xfs_dsymlink_hdr));
bp->b_ops = &xfs_symlink_buf_ops;
buf = bp->b_addr;
buf += xfs_symlink_hdr_set(mp, ip->i_ino, 0, ifp->if_bytes, bp);
memcpy(buf, ifp->if_u1.if_data, ifp->if_bytes);
xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsymlink_hdr) +
ifp->if_bytes - 1);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Chinner | 152 | 80.85% | 2 | 66.67% |
| Brian Foster | 36 | 19.15% | 1 | 33.33% |
| Total | 188 | 100.00% | 3 | 100.00% |
/* Verify the consistency of an inline symlink. */
xfs_failaddr_t
xfs_symlink_shortform_verify(
struct xfs_inode *ip)
{
char *sfp;
char *endp;
struct xfs_ifork *ifp;
int size;
ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_LOCAL);
ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
sfp = (char *)ifp->if_u1.if_data;
size = ifp->if_bytes;
endp = sfp + size;
/* Zero length symlinks can exist while we're deleting a remote one. */
if (size == 0)
return NULL;
/* No negative sizes or overly long symlink targets. */
if (size < 0 || size > XFS_SYMLINK_MAXLEN)
return __this_address;
/* No NULLs in the target either. */
if (memchr(sfp, 0, size - 1))
return __this_address;
/* We /did/ null-terminate the buffer, right? */
if (*endp != 0)
return __this_address;
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Darrick J. Wong | 125 | 100.00% | 1 | 100.00% |
| Total | 125 | 100.00% | 1 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Chinner | 715 | 73.11% | 6 | 28.57% |
| Darrick J. Wong | 171 | 17.48% | 6 | 28.57% |
| Brian Foster | 69 | 7.06% | 2 | 9.52% |
| Eric Sandeen | 22 | 2.25% | 6 | 28.57% |
| Carlos Maiolino | 1 | 0.10% | 1 | 4.76% |
| Total | 978 | 100.00% | 21 | 100.00% |
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