On Mon, Sep 18, 2017 at 08:26:30AM -0700, Christoph Hellwig wrote:
> Instead of passing in a formatter callback allocate the bmap buffer
> in the caller and process the entries there. Additionally replace
> the in-kernel buffer with a new much smaller structure, and unify
> the implementation of the different ioctls in a single function.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---
> fs/xfs/xfs_bmap_util.c | 38 ++++-----------
> fs/xfs/xfs_bmap_util.h | 10 ++--
> fs/xfs/xfs_ioctl.c | 122 ++++++++++++++++++++++++-------------------------
> 3 files changed, 75 insertions(+), 95 deletions(-)
>
> diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
> index a87d05978c92..b540ac65b8b3 100644
> --- a/fs/xfs/xfs_bmap_util.c
> +++ b/fs/xfs/xfs_bmap_util.c
> @@ -407,11 +407,11 @@ static int
> xfs_getbmap_report_one(
> struct xfs_inode *ip,
> struct getbmapx *bmv,
> - struct getbmapx *out,
> + struct kgetbmap *out,
> int64_t bmv_end,
> struct xfs_bmbt_irec *got)
> {
> - struct getbmapx *p = out + bmv->bmv_entries;
> + struct kgetbmap *p = out + bmv->bmv_entries;
> bool shared = false, trimmed = false;
> int error;
>
> @@ -458,12 +458,12 @@ static void
> xfs_getbmap_report_hole(
> struct xfs_inode *ip,
> struct getbmapx *bmv,
> - struct getbmapx *out,
> + struct kgetbmap *out,
> int64_t bmv_end,
> xfs_fileoff_t bno,
> xfs_fileoff_t end)
> {
> - struct getbmapx *p = out + bmv->bmv_entries;
> + struct kgetbmap *p = out + bmv->bmv_entries;
>
> if (bmv->bmv_iflags & BMV_IF_NO_HOLES)
> return;
> @@ -511,47 +511,36 @@ xfs_getbmap_next_rec(
> */
> int /* error code */
> xfs_getbmap(
> - xfs_inode_t *ip,
> + struct xfs_inode *ip,
> struct getbmapx *bmv, /* user bmap structure */
> - xfs_bmap_format_t formatter, /* format to user */
> - void *arg) /* formatter arg */
> + struct kgetbmap *out)
> {
> struct xfs_mount *mp = ip->i_mount;
> int iflags = bmv->bmv_iflags;
> - int whichfork, lock, i, error = 0;
> + int whichfork, lock, error = 0;
> int64_t bmv_end, max_len;
> xfs_fileoff_t bno, first_bno;
> struct xfs_ifork *ifp;
> - struct getbmapx *out;
> struct xfs_bmbt_irec got, rec;
> xfs_filblks_t len;
> xfs_extnum_t idx;
>
> + if (bmv->bmv_iflags & ~BMV_IF_VALID)
> + return -EINVAL;
> #ifndef DEBUG
> /* Only allow CoW fork queries if we're debugging. */
> if (iflags & BMV_IF_COWFORK)
> return -EINVAL;
> #endif
> -
> if ((iflags & BMV_IF_ATTRFORK) && (iflags & BMV_IF_COWFORK))
> return -EINVAL;
>
> - if (bmv->bmv_count <= 1)
> - return -EINVAL;
> - if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx))
> - return -ENOMEM;
> -
> if (bmv->bmv_length < -1)
> return -EINVAL;
> -
> bmv->bmv_entries = 0;
> if (bmv->bmv_length == 0)
> return 0;
>
> - out = kmem_zalloc_large(bmv->bmv_count * sizeof(struct getbmapx), 0);
> - if (!out)
> - return -ENOMEM;
> -
> if (iflags & BMV_IF_ATTRFORK)
> whichfork = XFS_ATTR_FORK;
> else if (iflags & BMV_IF_COWFORK)
> @@ -698,15 +687,6 @@ xfs_getbmap(
> xfs_iunlock(ip, lock);
> out_unlock_iolock:
> xfs_iunlock(ip, XFS_IOLOCK_SHARED);
> -
> - for (i = 0; i < bmv->bmv_entries; i++) {
> - /* format results & advance arg */
> - error = formatter(&arg, &out[i]);
> - if (error)
> - break;
> - }
> -
> - kmem_free(out);
> return error;
> }
>
> diff --git a/fs/xfs/xfs_bmap_util.h b/fs/xfs/xfs_bmap_util.h
> index 0eaa81dc49be..6cfe747cb142 100644
> --- a/fs/xfs/xfs_bmap_util.h
> +++ b/fs/xfs/xfs_bmap_util.h
> @@ -34,10 +34,14 @@ int xfs_bmap_eof(struct xfs_inode *ip, xfs_fileoff_t endoff,
> int xfs_bmap_punch_delalloc_range(struct xfs_inode *ip,
> xfs_fileoff_t start_fsb, xfs_fileoff_t length);
>
> -/* bmap to userspace formatter - copy to user & advance pointer */
> -typedef int (*xfs_bmap_format_t)(void **, struct getbmapx *);
> +struct kgetbmap {
> + __s64 bmv_offset; /* file offset of segment in blocks */
> + __s64 bmv_block; /* starting block (64-bit daddr_t) */
> + __s64 bmv_length; /* length of segment, blocks */
> + __s32 bmv_oflags; /* output flags */
> +};
> int xfs_getbmap(struct xfs_inode *ip, struct getbmapx *bmv,
> - xfs_bmap_format_t formatter, void *arg);
> + struct kgetbmap *out);
>
> /* functions in xfs_bmap.c that are only needed by xfs_bmap_util.c */
> int xfs_bmap_extsize_align(struct xfs_mount *mp, struct xfs_bmbt_irec *gotp,
> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
> index 5049e8ab6e30..8e1ab254aa19 100644
> --- a/fs/xfs/xfs_ioctl.c
> +++ b/fs/xfs/xfs_ioctl.c
> @@ -1539,17 +1539,26 @@ xfs_ioc_setxflags(
> return error;
> }
>
> -STATIC int
> -xfs_getbmap_format(void **ap, struct getbmapx *bmv)
> +static bool
> +xfs_getbmap_format(
> + struct kgetbmap *p,
> + struct getbmapx __user *u,
> + size_t recsize)
> {
> - struct getbmap __user *base = (struct getbmap __user *)*ap;
> -
> - /* copy only getbmap portion (not getbmapx) */
> - if (copy_to_user(base, bmv, sizeof(struct getbmap)))
> - return -EFAULT;
> -
> - *ap += sizeof(struct getbmap);
> - return 0;
> + if (put_user(p->bmv_offset, &u->bmv_offset) ||
> + put_user(p->bmv_block, &u->bmv_block) ||
> + put_user(p->bmv_length, &u->bmv_length) ||
> + put_user(0, &u->bmv_count) ||
> + put_user(0, &u->bmv_entries))
> + return false;
> + if (recsize < sizeof(struct getbmapx))
> + return true;
> + if (put_user(0, &u->bmv_iflags) ||
> + put_user(p->bmv_oflags, &u->bmv_oflags) ||
> + put_user(0, &u->bmv_unused1) ||
> + put_user(0, &u->bmv_unused2))
> + return false;
> + return true;
> }
>
> STATIC int
> @@ -1559,68 +1568,57 @@ xfs_ioc_getbmap(
> void __user *arg)
> {
> struct getbmapx bmx = { 0 };
> - int error;
> + struct kgetbmap *buf;
> + size_t recsize;
> + int error, i;
>
> - /* struct getbmap is a strict subset of struct getbmapx. */
> - if (copy_from_user(&bmx, arg, offsetof(struct getbmapx, bmv_iflags)))
> - return -EFAULT;
> -
> - if (bmx.bmv_count < 2)
> + switch (cmd) {
> + case XFS_IOC_GETBMAPA:
> + bmx.bmv_iflags = BMV_IF_ATTRFORK;
> + /*FALLTHRU*/
> + case XFS_IOC_GETBMAP:
> + if (file->f_mode & FMODE_NOCMTIME)
> + bmx.bmv_iflags |= BMV_IF_NO_DMAPI_READ;
> + /* struct getbmap is a strict subset of struct getbmapx. */
> + recsize = sizeof(struct getbmap);
> + break;
> + case XFS_IOC_GETBMAPX:
> + recsize = sizeof(struct getbmapx);
> + break;
> + default:
> return -EINVAL;
> + }
>
> - bmx.bmv_iflags = (cmd == XFS_IOC_GETBMAPA ? BMV_IF_ATTRFORK : 0);
> - if (file->f_mode & FMODE_NOCMTIME)
> - bmx.bmv_iflags |= BMV_IF_NO_DMAPI_READ;
> -
> - error = xfs_getbmap(XFS_I(file_inode(file)), &bmx, xfs_getbmap_format,
> - (__force struct getbmap *)arg+1);
> - if (error)
> - return error;
> -
> - /* copy back header - only size of getbmap */
> - if (copy_to_user(arg, &bmx, sizeof(struct getbmap)))
> - return -EFAULT;
> - return 0;
> -}
> -
> -STATIC int
> -xfs_getbmapx_format(void **ap, struct getbmapx *bmv)
> -{
> - struct getbmapx __user *base = (struct getbmapx __user *)*ap;
> -
> - if (copy_to_user(base, bmv, sizeof(struct getbmapx)))
> - return -EFAULT;
> -
> - *ap += sizeof(struct getbmapx);
> - return 0;
> -}
> -
> -STATIC int
> -xfs_ioc_getbmapx(
> - struct xfs_inode *ip,
> - void __user *arg)
> -{
> - struct getbmapx bmx;
> - int error;
> -
> - if (copy_from_user(&bmx, arg, sizeof(bmx)))
> + if (copy_from_user(&bmx, arg, recsize))
> return -EFAULT;
>
> if (bmx.bmv_count < 2)
> return -EINVAL;
> + if (bmx.bmv_count > ULONG_MAX / recsize)
> + return -ENOMEM;
>
> - if (bmx.bmv_iflags & (~BMV_IF_VALID))
> - return -EINVAL;
> + buf = kmem_zalloc_large(bmx.bmv_count * sizeof(*buf), 0);
> + if (!buf)
> + return -ENOMEM;
>
> - error = xfs_getbmap(ip, &bmx, xfs_getbmapx_format,
> - (__force struct getbmapx *)arg+1);
> + error = xfs_getbmap(XFS_I(file_inode(file)), &bmx, buf);
> if (error)
> - return error;
> + goto out_free_buf;
>
> - /* copy back header */
> - if (copy_to_user(arg, &bmx, sizeof(struct getbmapx)))
> - return -EFAULT;
> + error = -EFAULT;
> + if (copy_to_user(arg, &bmx, recsize))
> + goto out_free_buf;
> + arg += recsize;
> +
> + for (i = 0; i < bmx.bmv_entries; i++) {
> + if (!xfs_getbmap_format(buf + i, arg, recsize))
> + goto out_free_buf;
> + arg += recsize;
> + }
>
> + error = 0;
> +out_free_buf:
> + kmem_free(buf);
> return 0;
> }
>
> @@ -1877,10 +1875,8 @@ xfs_file_ioctl(
>
> case XFS_IOC_GETBMAP:
> case XFS_IOC_GETBMAPA:
> - return xfs_ioc_getbmap(filp, cmd, arg);
> -
> case XFS_IOC_GETBMAPX:
> - return xfs_ioc_getbmapx(ip, arg);
> + return xfs_ioc_getbmap(filp, cmd, arg);
>
> case FS_IOC_GETFSMAP:
> return xfs_ioc_getfsmap(ip, arg);
> --
> 2.14.1
>
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