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Set zvol discard_granularity to the volblocksize.

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Currently, zvols have a discard granularity set to 0, which suggests to
the upper layer that discard requests of arbirarily small size and
alignment can be made efficiently.

In practice however, ZFS does not handle unaligned discard requests
efficiently: indeed, it is unable to free a part of a block. It will
write zeros to the specified range instead, which is both useless and
inefficient (see dnode_free_range).

With this patch, zvol block devices expose volblocksize as their discard
granularity, so the upper layer is aware that it's not supposed to send
discard requests smaller than volblocksize.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #862
This commit is contained in:
Etienne Dechamps
2012-08-01 10:29:59 +02:00
committed by Brian Behlendorf
parent 9a512dca97
commit ee5fd0bb80
61 changed files with 233 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Makefile.in
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@@ -68,6 +68,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libavl/Makefile.in
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libefi/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libnvpair/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libshare/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libspl/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libspl/asm-generic/Makefile.in
+1
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@@ -69,6 +69,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libspl/asm-i386/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libspl/asm-x86_64/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libspl/include/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libspl/include/ia32/Makefile.in
+1
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@@ -68,6 +68,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libspl/include/ia32/sys/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libspl/include/rpc/Makefile.in
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libspl/include/sys/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libspl/include/sys/dktp/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libspl/include/sys/sysevent/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libspl/include/util/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libunicode/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libuutil/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libzfs/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \
lib/libzpool/Makefile.in
+1
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@@ -70,6 +70,7 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-create-umode-t.m4 \
$(top_srcdir)/config/kernel-d-make-root.m4 \
$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
$(top_srcdir)/config/kernel-discard-granularity.m4 \
$(top_srcdir)/config/kernel-encode-fh-inode.m4 \
$(top_srcdir)/config/kernel-evict-inode.m4 \
$(top_srcdir)/config/kernel-fallocate.m4 \