Date: Wed, 19 Jun 2013 05:02:26 +0000 (UTC) From: Scott Long <scottl@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r251987 - stable/9/sys/sys Message-ID: <201306190502.r5J52QmE066567@svn.freebsd.org>
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Author: scottl Date: Wed Jun 19 05:02:25 2013 New Revision: 251987 URL: http://svnweb.freebsd.org/changeset/base/251987 Log: Poor man's binary compatibility of the struct bio: move the added structure members to the end of the structure. Obtained from: Netflix Modified: stable/9/sys/sys/bio.h Modified: stable/9/sys/sys/bio.h ============================================================================== --- stable/9/sys/sys/bio.h Wed Jun 19 04:57:47 2013 (r251986) +++ stable/9/sys/sys/bio.h Wed Jun 19 05:02:25 2013 (r251987) @@ -81,9 +81,6 @@ struct bio { off_t bio_offset; /* Offset into file. */ long bio_bcount; /* Valid bytes in buffer. */ caddr_t bio_data; /* Memory, superblocks, indirect etc. */ - struct vm_page **bio_ma; /* Or unmapped. */ - int bio_ma_offset; /* Offset in the first page of bio_ma. */ - int bio_ma_n; /* Number of pages in bio_ma. */ int bio_error; /* Errno for BIO_ERROR. */ long bio_resid; /* Remaining I/O in bytes. */ void (*bio_done)(struct bio *); @@ -116,6 +113,11 @@ struct bio { /* XXX: these go away when bio chaining is introduced */ daddr_t bio_pblkno; /* physical block number */ + + /* Unmapped i/o. Placed at the end in 9.x for binary compatibility. */ + struct vm_page **bio_ma; /* Physical page array. */ + int bio_ma_offset; /* Offset in first page of bio_ma. */ + int bio_ma_n; /* Number of pages in bio_ma. */ }; struct uio;
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