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Linux: Fix ZFS_ENTER/ZFS_EXIT/ZFS_VERFY_ZP usage

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The ZFS_ENTER/ZFS_EXIT/ZFS_VERFY_ZP macros should not be used
in the Linux zpl_*.c source files.  They return a positive error
value which is correct for the common code, but not for the Linux
specific kernel code which expects a negative return value.  The
ZPL_ENTER/ZPL_EXIT/ZPL_VERFY_ZP macros should be used instead.

Furthermore, the ZPL_EXIT macro has been updated to not call the
zfs_exit_fs() function.  This prevents a possible deadlock which
can occur when a snapshot is automatically unmounted because the
zpl_show_devname() must never wait on in progress automatic
snapshot unmounts.

Reviewed-by: Adam Moss <c@yotes.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #11169 
Closes #11201
This commit is contained in:
Brian Behlendorf
2020-11-14 10:19:00 -08:00
committed by GitHub
parent d66aab7c08
commit 4352edaafb
4 changed files with 23 additions and 19 deletions
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module/os/linux/zfs/zpl_super.c
+2 -2
View File
@@ -185,7 +185,7 @@ zpl_remount_fs(struct super_block *sb, int *flags, char *data)
static int
__zpl_show_devname(struct seq_file *seq, zfsvfs_t *zfsvfs)
{
ZFS_ENTER(zfsvfs);
ZPL_ENTER(zfsvfs);
char *fsname = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP);
dmu_objset_name(zfsvfs->z_os, fsname);
@@ -205,7 +205,7 @@ __zpl_show_devname(struct seq_file *seq, zfsvfs_t *zfsvfs)
kmem_free(fsname, ZFS_MAX_DATASET_NAME_LEN);
ZFS_EXIT(zfsvfs);
ZPL_EXIT(zfsvfs);
return (0);
}