Support the fallocate() file operation.

Currently only the (FALLOC_FL_PUNCH_HOLE) flag combination is
supported, since it's the only one that matches the behavior of
zfs_space(). This makes it pretty much useless in its current
form, but it's a start.

To support other flag combinations we would need to modify
zfs_space() to make it more flexible, or emulate the desired
functionality in zpl_fallocate().

Signed-off-by: Brian Behlendorf <[email protected]>
Issue #334

7 files changed, 9 insertions, 0 deletions

diff --git a/include/Makefile.in b/include/Makefile.in
index d4bb07ce6..d7423a3c7 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -65,6 +65,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \
diff --git a/include/linux/Makefile.in b/include/linux/Makefile.in
index e88c69215..d18e5dd9c 100644
--- a/include/linux/Makefile.in
+++ b/include/linux/Makefile.in
@@ -65,6 +65,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \
diff --git a/include/sys/Makefile.in b/include/sys/Makefile.in
index 3903cefdc..06c20479b 100644
--- a/include/sys/Makefile.in
+++ b/include/sys/Makefile.in
@@ -65,6 +65,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \
diff --git a/include/sys/fm/Makefile.in b/include/sys/fm/Makefile.in
index 46255c8e6..245995dda 100644
--- a/include/sys/fm/Makefile.in
+++ b/include/sys/fm/Makefile.in
@@ -65,6 +65,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \
diff --git a/include/sys/fm/fs/Makefile.in b/include/sys/fm/fs/Makefile.in
index 5dd6f4882..10dcd83e9 100644
--- a/include/sys/fm/fs/Makefile.in
+++ b/include/sys/fm/fs/Makefile.in
@@ -65,6 +65,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \
diff --git a/include/sys/fs/Makefile.in b/include/sys/fs/Makefile.in
index 550b106bb..ee2f16821 100644
--- a/include/sys/fs/Makefile.in
+++ b/include/sys/fs/Makefile.in
@@ -65,6 +65,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \
diff --git a/include/sys/zpl.h b/include/sys/zpl.h
index 2195ec9a3..cfc86794e 100644
--- a/include/sys/zpl.h
+++ b/include/sys/zpl.h
@@ -30,6 +30,7 @@
 #include <linux/xattr_compat.h>
 #include <linux/exportfs.h>
 #include <linux/writeback.h>
+#include <linux/falloc.h>
 
 /* zpl_inode.c */
 extern const struct inode_operations zpl_inode_operations;
@@ -42,6 +43,8 @@ extern ssize_t zpl_read_common(struct inode *ip, const char *buf,
     size_t len, loff_t pos, uio_seg_t segment, int flags, cred_t *cr);
 extern ssize_t zpl_write_common(struct inode *ip, const char *buf,
     size_t len, loff_t pos, uio_seg_t segment, int flags, cred_t *cr);
+extern long zpl_fallocate_common(struct inode *ip, int mode,
+    loff_t offset, loff_t len);
 
 extern const struct address_space_operations zpl_address_space_operations;
 extern const struct file_operations zpl_file_operations;