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Add zfs module feature and property compatibility

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This change is required to ease the transition when upgrading
from 0.7.x to 0.8.x.  It allows 0.8.x user space utilities to
remain compatible with 0.7.x and older kernel modules.

Reviewed-by: Don Brady <don.brady@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #8231
This commit is contained in:
Brian Behlendorf 2019-01-03 15:19:37 -08:00 committed by GitHub
parent 5365b0747a
commit 0b8e4418b6
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1 changed files with 30 additions and 6 deletions
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36
module/zcommon/zfeature_common.c
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@ -163,25 +163,49 @@ deps_contains_feature(const spa_feature_t *deps, const spa_feature_t feature)
static boolean_t
zfs_mod_supported_impl(const char *scope, const char *name, const char *sysfs)
{
struct stat64 statbuf;
char *path;
boolean_t supported = B_FALSE;
int len;
len = asprintf(&path, "%s/%s/%s", sysfs, scope, name);
char *path;
int len = asprintf(&path, "%s%s%s%s%s", sysfs,
scope == NULL ? "" : "/", scope == NULL ? "" : scope,
name == NULL ? "" : "/", name == NULL ? "" : name);
if (len > 0) {
struct stat64 statbuf;
supported = !!(stat64(path, &statbuf) == 0);
free(path);
}
return (supported);
}
boolean_t
zfs_mod_supported(const char *scope, const char *name)
{
return (zfs_mod_supported_impl(scope, name, ZFS_SYSFS_DIR) ||
boolean_t supported;
/*
* Check both the primary and alternate sysfs locations to determine
* if the required functionality is supported.
*/
supported = (zfs_mod_supported_impl(scope, name, ZFS_SYSFS_DIR) ||
zfs_mod_supported_impl(scope, name, ZFS_SYSFS_ALT_DIR));
/*
* For backwards compatibility with kernel modules that predate
* supported feature/property checking. Report the feature/property
* as supported if the kernel module is loaded but the requested
* scope directory does not exist.
*/
if (supported == B_FALSE) {
struct stat64 statbuf;
if ((stat64(ZFS_SYSFS_DIR, &statbuf) == 0) &&
!zfs_mod_supported_impl(scope, NULL, ZFS_SYSFS_DIR) &&
!zfs_mod_supported_impl(scope, NULL, ZFS_SYSFS_ALT_DIR)) {
supported = B_TRUE;
}
}
return (supported);
}
#endif