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linux: implement filesystem-side copy/clone functions
This implements the Linux VFS ops required to service the file copy/clone APIs: .copy_file_range (4.5+) .clone_file_range (4.5-4.19) .dedupe_file_range (4.5-4.19) .remap_file_range (4.20+) Note that dedupe_file_range() and remap_file_range(REMAP_FILE_DEDUP) are hooked up here, but are not implemented yet. Signed-off-by: Rob Norris <[email protected]> Sponsored-By: OpenDrives Inc. Sponsored-By: Klara Inc.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| dnl # | ||
| dnl # The *_file_range APIs have a long history: | ||
| dnl # | ||
| dnl # 2.6.29: BTRFS_IOC_CLONE and BTRFS_IOC_CLONE_RANGE ioctl introduced | ||
| dnl # 3.12: BTRFS_IOC_FILE_EXTENT_SAME ioctl introduced | ||
| dnl # | ||
| dnl # 4.5: copy_file_range() syscall introduced, added to VFS | ||
| dnl # 4.5: BTRFS_IOC_CLONE and BTRFS_IOC_CLONE_RANGE renamed to FICLONE ands | ||
| dnl # FICLONERANGE, added to VFS as clone_file_range() | ||
| dnl # 4.5: BTRFS_IOC_FILE_EXTENT_SAME renamed to FIDEDUPERANGE, added to VFS | ||
| dnl # as dedupe_file_range() | ||
| dnl # | ||
| dnl # 4.20: VFS clone_file_range() and dedupe_file_range() replaced by | ||
| dnl # remap_file_range() | ||
| dnl # | ||
| dnl # 5.3: VFS copy_file_range() expected to do its own fallback, | ||
| dnl # generic_copy_file_range() added to support it | ||
| dnl # | ||
| AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_COPY_FILE_RANGE], [ | ||
| ZFS_LINUX_TEST_SRC([vfs_copy_file_range], [ | ||
| #include <linux/fs.h> | ||
| static ssize_t test_copy_file_range(struct file *src_file, | ||
| loff_t src_off, struct file *dst_file, loff_t dst_off, | ||
| size_t len, unsigned int flags) { | ||
| (void) src_file; (void) src_off; | ||
| (void) dst_file; (void) dst_off; | ||
| (void) len; (void) flags; | ||
| return (0); | ||
| } | ||
| static const struct file_operations | ||
| fops __attribute__ ((unused)) = { | ||
| .copy_file_range = test_copy_file_range, | ||
| }; | ||
| ],[]) | ||
| ]) | ||
| AC_DEFUN([ZFS_AC_KERNEL_VFS_COPY_FILE_RANGE], [ | ||
| AC_MSG_CHECKING([whether fops->copy_file_range() is available]) | ||
| ZFS_LINUX_TEST_RESULT([vfs_copy_file_range], [ | ||
| AC_MSG_RESULT([yes]) | ||
| AC_DEFINE(HAVE_VFS_COPY_FILE_RANGE, 1, | ||
| [fops->copy_file_range() is available]) | ||
| ],[ | ||
| AC_MSG_RESULT([no]) | ||
| ]) | ||
| ]) | ||
|
|
||
| AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_GENERIC_COPY_FILE_RANGE], [ | ||
| ZFS_LINUX_TEST_SRC([generic_copy_file_range], [ | ||
| #include <linux/fs.h> | ||
| ], [ | ||
| struct file *src_file __attribute__ ((unused)) = NULL; | ||
| loff_t src_off __attribute__ ((unused)) = 0; | ||
| struct file *dst_file __attribute__ ((unused)) = NULL; | ||
| loff_t dst_off __attribute__ ((unused)) = 0; | ||
| size_t len __attribute__ ((unused)) = 0; | ||
| unsigned int flags __attribute__ ((unused)) = 0; | ||
| generic_copy_file_range(src_file, src_off, dst_file, dst_off, | ||
| len, flags); | ||
| ]) | ||
| ]) | ||
| AC_DEFUN([ZFS_AC_KERNEL_VFS_GENERIC_COPY_FILE_RANGE], [ | ||
| AC_MSG_CHECKING([whether generic_copy_file_range() is available]) | ||
| ZFS_LINUX_TEST_RESULT_SYMBOL([generic_copy_file_range], | ||
| [generic_copy_file_range], [fs/read_write.c], [ | ||
| AC_MSG_RESULT(yes) | ||
| AC_DEFINE(HAVE_VFS_GENERIC_COPY_FILE_RANGE, 1, | ||
| [generic_copy_file_range() is available]) | ||
| ],[ | ||
| AC_MSG_RESULT(no) | ||
| ]) | ||
| ]) | ||
|
|
||
| AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_CLONE_FILE_RANGE], [ | ||
| ZFS_LINUX_TEST_SRC([vfs_clone_file_range], [ | ||
| #include <linux/fs.h> | ||
| static int test_clone_file_range(struct file *src_file, | ||
| loff_t src_off, struct file *dst_file, loff_t dst_off, | ||
| u64 len) { | ||
| (void) src_file; (void) src_off; | ||
| (void) dst_file; (void) dst_off; | ||
| (void) len; | ||
| return (0); | ||
| } | ||
| static const struct file_operations | ||
| fops __attribute__ ((unused)) = { | ||
| .clone_file_range = test_clone_file_range, | ||
| }; | ||
| ],[]) | ||
| ]) | ||
| AC_DEFUN([ZFS_AC_KERNEL_VFS_CLONE_FILE_RANGE], [ | ||
| AC_MSG_CHECKING([whether fops->clone_file_range() is available]) | ||
| ZFS_LINUX_TEST_RESULT([vfs_clone_file_range], [ | ||
| AC_MSG_RESULT([yes]) | ||
| AC_DEFINE(HAVE_VFS_CLONE_FILE_RANGE, 1, | ||
| [fops->clone_file_range() is available]) | ||
| ],[ | ||
| AC_MSG_RESULT([no]) | ||
| ]) | ||
| ]) | ||
|
|
||
| AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_DEDUPE_FILE_RANGE], [ | ||
| ZFS_LINUX_TEST_SRC([vfs_dedupe_file_range], [ | ||
| #include <linux/fs.h> | ||
| static int test_dedupe_file_range(struct file *src_file, | ||
| loff_t src_off, struct file *dst_file, loff_t dst_off, | ||
| u64 len) { | ||
| (void) src_file; (void) src_off; | ||
| (void) dst_file; (void) dst_off; | ||
| (void) len; | ||
| return (0); | ||
| } | ||
| static const struct file_operations | ||
| fops __attribute__ ((unused)) = { | ||
| .dedupe_file_range = test_dedupe_file_range, | ||
| }; | ||
| ],[]) | ||
| ]) | ||
| AC_DEFUN([ZFS_AC_KERNEL_VFS_DEDUPE_FILE_RANGE], [ | ||
| AC_MSG_CHECKING([whether fops->dedupe_file_range() is available]) | ||
| ZFS_LINUX_TEST_RESULT([vfs_dedupe_file_range], [ | ||
| AC_MSG_RESULT([yes]) | ||
| AC_DEFINE(HAVE_VFS_DEDUPE_FILE_RANGE, 1, | ||
| [fops->dedupe_file_range() is available]) | ||
| ],[ | ||
| AC_MSG_RESULT([no]) | ||
| ]) | ||
| ]) | ||
|
|
||
| AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_REMAP_FILE_RANGE], [ | ||
| ZFS_LINUX_TEST_SRC([vfs_remap_file_range], [ | ||
| #include <linux/fs.h> | ||
| static loff_t test_remap_file_range(struct file *src_file, | ||
| loff_t src_off, struct file *dst_file, loff_t dst_off, | ||
| loff_t len, unsigned int flags) { | ||
| (void) src_file; (void) src_off; | ||
| (void) dst_file; (void) dst_off; | ||
| (void) len; (void) flags; | ||
| return (0); | ||
| } | ||
| static const struct file_operations | ||
| fops __attribute__ ((unused)) = { | ||
| .remap_file_range = test_remap_file_range, | ||
| }; | ||
| ],[]) | ||
| ]) | ||
|
|
||
| AC_DEFUN([ZFS_AC_KERNEL_VFS_REMAP_FILE_RANGE], [ | ||
| AC_MSG_CHECKING([whether fops->remap_file_range() is available]) | ||
| ZFS_LINUX_TEST_RESULT([vfs_remap_file_range], [ | ||
| AC_MSG_RESULT([yes]) | ||
| AC_DEFINE(HAVE_VFS_REMAP_FILE_RANGE, 1, | ||
| [fops->remap_file_range() is available]) | ||
| ],[ | ||
| AC_MSG_RESULT([no]) | ||
| ]) | ||
| ]) |
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