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Add linux kernel device support

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This branch contains the majority of the changes required to cleanly
intergrate with Linux style special devices (/dev/zfs).  Mainly this
means dropping all the Solaris style callbacks and replacing them
with the Linux equivilants.

This patch also adds the onexit infrastructure needed to track
some minimal state between ioctls.  Under Linux it would be easy
to do this simply using the file->private_data.  But under Solaris
they apparent need to pass the file descriptor as part of the ioctl
data and then perform a lookup in the kernel.  Once again to keep
code change to a minimum I've implemented the Solaris solution.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf
2010-08-26 11:44:39 -07:00
parent 47d0ed1e6f
commit 325f023544
8 changed files with 798 additions and 257 deletions
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lib/libzfs/libzfs_diff.c
+1 -1
View File
@@ -726,7 +726,7 @@ setup_differ_info(zfs_handle_t *zhp, const char *fromsnap,
{
di->zhp = zhp;
di->cleanupfd = open(ZFS_DEV, O_RDWR|O_EXCL);
di->cleanupfd = open(ZFS_DEV, O_RDWR);
VERIFY(di->cleanupfd >= 0);
if (get_snapshot_names(di, fromsnap, tosnap) != 0)
lib/libzfs/libzfs_sendrecv.c
+2 -2
View File
@@ -1413,7 +1413,7 @@ zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
++holdseq;
(void) snprintf(sdd.holdtag, sizeof (sdd.holdtag),
".send-%d-%llu", getpid(), (u_longlong_t)holdseq);
sdd.cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL);
sdd.cleanup_fd = open(ZFS_DEV, O_RDWR);
if (sdd.cleanup_fd < 0) {
err = errno;
goto stderr_out;
@@ -2988,7 +2988,7 @@ zfs_receive(libzfs_handle_t *hdl, const char *tosnap, recvflags_t flags,
int cleanup_fd;
uint64_t action_handle = 0;
cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL);
cleanup_fd = open(ZFS_DEV, O_RDWR);
VERIFY(cleanup_fd >= 0);
err = zfs_receive_impl(hdl, tosnap, flags, infd, NULL, NULL,