From 232b51948b99dfcc95e81d8a289bc0409b3ff5b3 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 17 Oct 2017 14:16:19 -0700 Subject: xfs: simplify the xfs_getbmap interface 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 Reviewed-by: Brian Foster Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong --- fs/xfs/xfs_ioctl.c | 122 ++++++++++++++++++++++++++--------------------------- 1 file changed, 59 insertions(+), 63 deletions(-) (limited to 'fs/xfs/xfs_ioctl.c') diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index aa75389be8cf..b01a19844799 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1540,17 +1540,26 @@ out_drop_write: 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 @@ -1560,68 +1569,57 @@ 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; } @@ -1878,10 +1876,8 @@ 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); -- cgit v1.2.3