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Illumos 3749 - zfs event processing should work on R/O root filesystems

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3749 zfs event processing should work on R/O root filesystems
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Approved by: Christopher Siden <christopher.siden@delphix.com>

References:
  https://www.illumos.org/issues/3749
  https://github.com/illumos/illumos-gate/commit/3cb69f7

Porting notes:
- [include/sys/spa_impl.h]
  - ffe9d38 Add generic errata infrastructure
  - 1421c89 Add visibility in to arc_read
- [include/sys/fm/fs/zfs.h]
  - 2668527 Add linux events
  - 6283f55 Support custom build directories and move includes
- [module/zfs/spa_config.c]
  - Updated spa_config_sync() to match illumos with the exception
    of a Linux specific block.

Ported-by: kernelOfTruth kerneloftruth@gmail.com
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Will Andrews
2015-12-31 17:38:59 +01:00
committed by Brian Behlendorf
parent e9e3d31d2c
commit b47637ecdc
4 changed files with 78 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/spa_config.c
+47 -18
View File
@@ -26,6 +26,7 @@
*/
#include <sys/spa.h>
#include <sys/fm/fs/zfs.h>
#include <sys/spa_impl.h>
#include <sys/nvpair.h>
#include <sys/uio.h>
@@ -145,22 +146,22 @@ out:
kobj_close_file(file);
}
static void
static int
spa_config_write(spa_config_dirent_t *dp, nvlist_t *nvl)
{
size_t buflen;
char *buf;
vnode_t *vp;
int oflags = FWRITE | FTRUNC | FCREAT | FOFFMAX;
int error;
char *temp;
int err;
/*
* If the nvlist is empty (NULL), then remove the old cachefile.
*/
if (nvl == NULL) {
(void) vn_remove(dp->scd_path, UIO_SYSSPACE, RMFILE);
return;
err = vn_remove(dp->scd_path, UIO_SYSSPACE, RMFILE);
return (err);
}
/*
@@ -181,16 +182,16 @@ spa_config_write(spa_config_dirent_t *dp, nvlist_t *nvl)
* and overwritten in place. In the event of an error the file is
* unlinked to make sure we always have a consistent view of the data.
*/
error = vn_open(dp->scd_path, UIO_SYSSPACE, oflags, 0644, &vp, 0, 0);
if (error == 0) {
error = vn_rdwr(UIO_WRITE, vp, buf, buflen, 0,
err = vn_open(dp->scd_path, UIO_SYSSPACE, oflags, 0644, &vp, 0, 0);
if (err == 0) {
err = vn_rdwr(UIO_WRITE, vp, buf, buflen, 0,
UIO_SYSSPACE, 0, RLIM64_INFINITY, kcred, NULL);
if (error == 0)
error = VOP_FSYNC(vp, FSYNC, kcred, NULL);
if (err == 0)
err = VOP_FSYNC(vp, FSYNC, kcred, NULL);
(void) VOP_CLOSE(vp, oflags, 1, 0, kcred, NULL);
if (error)
if (err)
(void) vn_remove(dp->scd_path, UIO_SYSSPACE, RMFILE);
}
#else
@@ -201,14 +202,16 @@ spa_config_write(spa_config_dirent_t *dp, nvlist_t *nvl)
*/
(void) snprintf(temp, MAXPATHLEN, "%s.tmp", dp->scd_path);
error = vn_open(temp, UIO_SYSSPACE, oflags, 0644, &vp, CRCREAT, 0);
if (error == 0) {
if (vn_rdwr(UIO_WRITE, vp, buf, buflen, 0, UIO_SYSSPACE,
0, RLIM64_INFINITY, kcred, NULL) == 0 &&
VOP_FSYNC(vp, FSYNC, kcred, NULL) == 0) {
(void) vn_rename(temp, dp->scd_path, UIO_SYSSPACE);
}
err = vn_open(temp, UIO_SYSSPACE, oflags, 0644, &vp, CRCREAT, 0);
if (err == 0) {
err = vn_rdwr(UIO_WRITE, vp, buf, buflen, 0, UIO_SYSSPACE,
0, RLIM64_INFINITY, kcred, NULL);
if (err == 0)
err = VOP_FSYNC(vp, FSYNC, kcred, NULL);
if (err == 0)
err = vn_rename(temp, dp->scd_path, UIO_SYSSPACE);
(void) VOP_CLOSE(vp, oflags, 1, 0, kcred, NULL);
VN_RELE(vp);
}
(void) vn_remove(temp, UIO_SYSSPACE, RMFILE);
@@ -216,6 +219,7 @@ spa_config_write(spa_config_dirent_t *dp, nvlist_t *nvl)
vmem_free(buf, buflen);
kmem_free(temp, MAXPATHLEN);
return (err);
}
/*
@@ -233,6 +237,8 @@ spa_config_sync(spa_t *target, boolean_t removing, boolean_t postsysevent)
spa_config_dirent_t *dp, *tdp;
nvlist_t *nvl;
char *pool_name;
boolean_t ccw_failure;
int error = 0;
ASSERT(MUTEX_HELD(&spa_namespace_lock));
@@ -244,6 +250,7 @@ spa_config_sync(spa_t *target, boolean_t removing, boolean_t postsysevent)
* cachefile is changed, the new one is pushed onto this list, allowing
* us to update previous cachefiles that no longer contain this pool.
*/
ccw_failure = B_FALSE;
for (dp = list_head(&target->spa_config_list); dp != NULL;
dp = list_next(&target->spa_config_list, dp)) {
spa_t *spa = NULL;
@@ -290,10 +297,32 @@ spa_config_sync(spa_t *target, boolean_t removing, boolean_t postsysevent)
mutex_exit(&spa->spa_props_lock);
}
spa_config_write(dp, nvl);
error = spa_config_write(dp, nvl);
if (error != 0)
ccw_failure = B_TRUE;
nvlist_free(nvl);
}
if (ccw_failure) {
/*
* Keep trying so that configuration data is
* written if/when any temporary filesystem
* resource issues are resolved.
*/
if (target->spa_ccw_fail_time == 0) {
zfs_ereport_post(FM_EREPORT_ZFS_CONFIG_CACHE_WRITE,
target, NULL, NULL, 0, 0);
}
target->spa_ccw_fail_time = gethrtime();
spa_async_request(target, SPA_ASYNC_CONFIG_UPDATE);
} else {
/*
* Do not rate limit future attempts to update
* the config cache.
*/
target->spa_ccw_fail_time = 0;
}
/*
* Remove any config entries older than the current one.
*/