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| author | Olaf Hering <olaf@aepfle.de> | 2014-05-21 16:32:40 +0200 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2014-05-28 14:17:26 -0400 |
| commit | 1c8cad6c1bbcacc07332539f2d7dee22521f9ae0 (patch) | |
| tree | 28ecdd3556805dfd8bc201eb4ddad5a2bf1f6eea /drivers/block | |
| parent | c9eaa447e77efe77b7fa4c953bd62de8297fd6c5 (diff) | |
| download | linux-1c8cad6c1bbcacc07332539f2d7dee22521f9ae0.tar.gz linux-1c8cad6c1bbcacc07332539f2d7dee22521f9ae0.tar.bz2 linux-1c8cad6c1bbcacc07332539f2d7dee22521f9ae0.zip | |
xen-blkfront: remove type check from blkfront_setup_discard
In its initial implementation a check for "type" was added, but only phy
and file are handled. This breaks advertised discard support for other
type values such as qdisk.
Fix and simplify this function: If the backend advertises discard
support it is supposed to implement it properly, so enable
feature_discard unconditionally. If the backend advertises the need for
a certain granularity and alignment then propagate both properties to
the blocklayer. The discard-secure property is a boolean, update the code
to reflect that.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/xen-blkfront.c | 40 |
1 files changed, 14 insertions, 26 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index efe1b4761735..25c11ad34184 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -1635,36 +1635,24 @@ blkfront_closing(struct blkfront_info *info) static void blkfront_setup_discard(struct blkfront_info *info) { int err; - char *type; unsigned int discard_granularity; unsigned int discard_alignment; unsigned int discard_secure; - type = xenbus_read(XBT_NIL, info->xbdev->otherend, "type", NULL); - if (IS_ERR(type)) - return; - - info->feature_secdiscard = 0; - if (strncmp(type, "phy", 3) == 0) { - err = xenbus_gather(XBT_NIL, info->xbdev->otherend, - "discard-granularity", "%u", &discard_granularity, - "discard-alignment", "%u", &discard_alignment, - NULL); - if (!err) { - info->feature_discard = 1; - info->discard_granularity = discard_granularity; - info->discard_alignment = discard_alignment; - } - err = xenbus_gather(XBT_NIL, info->xbdev->otherend, - "discard-secure", "%d", &discard_secure, - NULL); - if (!err) - info->feature_secdiscard = discard_secure; - - } else if (strncmp(type, "file", 4) == 0) - info->feature_discard = 1; - - kfree(type); + info->feature_discard = 1; + err = xenbus_gather(XBT_NIL, info->xbdev->otherend, + "discard-granularity", "%u", &discard_granularity, + "discard-alignment", "%u", &discard_alignment, + NULL); + if (!err) { + info->discard_granularity = discard_granularity; + info->discard_alignment = discard_alignment; + } + err = xenbus_gather(XBT_NIL, info->xbdev->otherend, + "discard-secure", "%d", &discard_secure, + NULL); + if (!err) + info->feature_secdiscard = !!discard_secure; } static int blkfront_setup_indirect(struct blkfront_info *info) |