From: Dave Chinner Date: Wed, 14 Nov 2012 06:42:47 +0000 (+1100) Subject: xfs: remove xfs_tosspages X-Git-Tag: MMI-PSA29.97-13-9~15411^2~34 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f5b8911b67eb4f15d95d5e5324d376d4a49d56e8;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git xfs: remove xfs_tosspages It's a buggy, unnecessary wrapper that is duplicating truncate_pagecache_range(). When replacing the call in xfs_change_file_space(), also ensure that the length being allocated/freed is always positive before making any changes. These checks are done in the lower extent manipulation functions, too, but we need to do them before any page cache operations. Reported-by: Andrew Dahl Signed-off-by: Dave Chinner Reviewed-By: Andrew Dahl Signed-off-by: Ben Myers --- diff --git a/fs/xfs/xfs_dfrag.c b/fs/xfs/xfs_dfrag.c index b9b8646e62db..b2c63a28afa7 100644 --- a/fs/xfs/xfs_dfrag.c +++ b/fs/xfs/xfs_dfrag.c @@ -315,8 +315,7 @@ xfs_swap_extents( * are safe. We don't really care if non-io related * fields change. */ - - xfs_tosspages(ip, 0, -1, FI_REMAPF); + truncate_pagecache_range(VFS_I(ip), 0, -1); tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT); if ((error = xfs_trans_reserve(tp, 0, diff --git a/fs/xfs/xfs_fs_subr.c b/fs/xfs/xfs_fs_subr.c index 652b875a9d4c..d49de3d70456 100644 --- a/fs/xfs/xfs_fs_subr.c +++ b/fs/xfs/xfs_fs_subr.c @@ -25,18 +25,6 @@ * note: all filemap functions return negative error codes. These * need to be inverted before returning to the xfs core functions. */ -void -xfs_tosspages( - xfs_inode_t *ip, - xfs_off_t first, - xfs_off_t last, - int fiopt) -{ - /* can't toss partial tail pages, so mask them out */ - last &= ~(PAGE_SIZE - 1); - truncate_inode_pages_range(VFS_I(ip)->i_mapping, first, last - 1); -} - int xfs_flushinval_pages( xfs_inode_t *ip, diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c index c2ddd7a43942..de3702a57e55 100644 --- a/fs/xfs/xfs_vnodeops.c +++ b/fs/xfs/xfs_vnodeops.c @@ -2118,7 +2118,7 @@ xfs_change_file_space( xfs_fsize_t fsize; int setprealloc; xfs_off_t startoffset; - xfs_off_t llen; + xfs_off_t end; xfs_trans_t *tp; struct iattr iattr; int prealloc_type; @@ -2139,12 +2139,30 @@ xfs_change_file_space( return XFS_ERROR(EINVAL); } - llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len; + /* + * length of <= 0 for resv/unresv/zero is invalid. length for + * alloc/free is ignored completely and we have no idea what userspace + * might have set it to, so set it to zero to allow range + * checks to pass. + */ + switch (cmd) { + case XFS_IOC_ZERO_RANGE: + case XFS_IOC_RESVSP: + case XFS_IOC_RESVSP64: + case XFS_IOC_UNRESVSP: + case XFS_IOC_UNRESVSP64: + if (bf->l_len <= 0) + return XFS_ERROR(EINVAL); + break; + default: + bf->l_len = 0; + break; + } if (bf->l_start < 0 || bf->l_start > mp->m_super->s_maxbytes || - bf->l_start + llen < 0 || - bf->l_start + llen > mp->m_super->s_maxbytes) + bf->l_start + bf->l_len < 0 || + bf->l_start + bf->l_len >= mp->m_super->s_maxbytes) return XFS_ERROR(EINVAL); bf->l_whence = 0; @@ -2169,7 +2187,9 @@ xfs_change_file_space( switch (cmd) { case XFS_IOC_ZERO_RANGE: prealloc_type |= XFS_BMAPI_CONVERT; - xfs_tosspages(ip, startoffset, startoffset + bf->l_len, 0); + end = round_down(startoffset + bf->l_len, PAGE_SIZE) - 1; + if (startoffset > end) + truncate_pagecache_range(VFS_I(ip), startoffset, end); /* FALLTHRU */ case XFS_IOC_RESVSP: case XFS_IOC_RESVSP64: diff --git a/fs/xfs/xfs_vnodeops.h b/fs/xfs/xfs_vnodeops.h index 52fafc416a0c..d48141d6bc3b 100644 --- a/fs/xfs/xfs_vnodeops.h +++ b/fs/xfs/xfs_vnodeops.h @@ -48,8 +48,6 @@ int xfs_attr_set(struct xfs_inode *dp, const unsigned char *name, int xfs_attr_remove(struct xfs_inode *dp, const unsigned char *name, int flags); int xfs_attr_list(struct xfs_inode *dp, char *buffer, int bufsize, int flags, struct attrlist_cursor_kern *cursor); -void xfs_tosspages(struct xfs_inode *inode, xfs_off_t first, - xfs_off_t last, int fiopt); int xfs_flushinval_pages(struct xfs_inode *ip, xfs_off_t first, xfs_off_t last, int fiopt); int xfs_flush_pages(struct xfs_inode *ip, xfs_off_t first,