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linux: libzfs: simplify module-loaded check

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The short-path is now one access() call,
we always modprobe zfs (ZFS_MODULE_LOADING which doesn't use the libzfs
boolean parsing is gone),
and we use a simple inotify IN_CREATE loop with a timerfd timeout
rather than 10ms kernel-style polling

There's one substantial difference: ZFS_MODULE_TIMEOUT=-1
now means "never give up", rather than "wait 10 minutes"

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13330
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2022-04-14 23:30:41 +02:00
committed by Brian Behlendorf
parent 89e81bc6ad
commit 38f4d99f76
4 changed files with 109 additions and 89 deletions
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include/sys/fs/zfs.h
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@@ -1292,6 +1292,7 @@ typedef struct ddt_histogram {
#define ZVOL_DRIVER "zvol"
#define ZFS_DRIVER "zfs"
#define ZFS_DEV "/dev/zfs"
#define ZFS_DEVDIR "/dev"
#define ZFS_SUPER_MAGIC 0x2fc12fc1