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From: wysochanski@sourceware.org To: lvm-devel@redhat.com, lvm2-cvs@sourceware.org Subject: LVM2/lib/format_text format-text.c layout.h Date: Mon, 28 Jun 2010 20:29:00 -0000 [thread overview] Message-ID: <20100628202957.12913.qmail@sourceware.org> (raw) CVSROOT: /cvs/lvm2 Module name: LVM2 Changes by: wysochanski@sourceware.org 2010-06-28 20:29:57 Modified files: lib/format_text: format-text.c layout.h Log message: Add text format specific 'rlocn' ignore flag and access functions. Adding a flag to the 'rlocn' structure in the mda header of the text format allows us to flip a bit to ignore an area on disk that stores the metadata via the text format specific mda_header. This patch defines the flag and access functions to manage the flag. Other patches will manage the ignore on a format-independent basis, by using a flag in the metadata_area structure. Signed-off-by: Dave Wysochanski <dwysocha@redhat.com> Patches: http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/lib/format_text/format-text.c.diff?cvsroot=lvm2&r1=1.123&r2=1.124 http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/lib/format_text/layout.h.diff?cvsroot=lvm2&r1=1.10&r2=1.11 --- LVM2/lib/format_text/format-text.c 2010/06/22 19:18:27 1.123 +++ LVM2/lib/format_text/format-text.c 2010/06/28 20:29:57 1.124 @@ -66,6 +66,19 @@ char *desc; /* Description placed inside file */ }; +int rlocn_is_ignored(const struct raw_locn *rlocn) +{ + return (rlocn->flags & RAW_LOCN_IGNORED ? 1 : 0); +} + +void rlocn_set_ignored(struct raw_locn *rlocn, int value) +{ + if (value) + rlocn->flags |= RAW_LOCN_IGNORED; + else + rlocn->flags &= ~RAW_LOCN_IGNORED; +} + /* * NOTE: Currently there can be only one vg per text file. */ --- LVM2/lib/format_text/layout.h 2010/06/28 20:29:42 1.10 +++ LVM2/lib/format_text/layout.h 2010/06/28 20:29:57 1.11 @@ -46,6 +46,13 @@ struct disk_locn disk_areas_xl[0]; /* Two lists */ } __attribute__ ((packed)); +/* + * Ignore this raw location. This allows us to + * ignored metadata areas easily, and thus balance + * metadata across VGs with many PVs. + */ +#define RAW_LOCN_IGNORED 0x00000001 + /* On disk */ struct raw_locn { uint64_t offset; /* Offset in bytes to start sector */ @@ -54,6 +61,9 @@ uint32_t flags; } __attribute__ ((packed)); +int rlocn_is_ignored(const struct raw_locn *rlocn); +void rlocn_set_ignored(struct raw_locn *rlocn, int value); + /* On disk */ /* Structure size limited to one sector */ struct mda_header {
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