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zfs_enter rework

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Replace ZFS_ENTER and ZFS_VERIFY_ZP, which have hidden returns, with
functions that return error code. The reason we want to do this is
because hidden returns are not obvious and had caused some missing fail
path unwinding.

This patch changes the common, linux, and freebsd parts. Also fixes
fail path unwinding in zfs_fsync, zpl_fsync, zpl_xattr_{list,get,set}, and
zfs_lookup().

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Chunwei Chen <david.chen@nutanix.com>
Closes #13831
This commit is contained in:
Chunwei Chen
2022-09-16 13:36:47 -07:00
committed by GitHub
parent b24d1c77f7
commit 768eacedef
15 changed files with 591 additions and 486 deletions
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module/os/linux/zfs/zpl_super.c
+4 -2
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@@ -185,7 +185,9 @@ zpl_remount_fs(struct super_block *sb, int *flags, char *data)
static int
__zpl_show_devname(struct seq_file *seq, zfsvfs_t *zfsvfs)
{
ZPL_ENTER(zfsvfs);
int error;
if ((error = zpl_enter(zfsvfs, FTAG)) != 0)
return (error);
char *fsname = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP);
dmu_objset_name(zfsvfs->z_os, fsname);
@@ -205,7 +207,7 @@ __zpl_show_devname(struct seq_file *seq, zfsvfs_t *zfsvfs)
kmem_free(fsname, ZFS_MAX_DATASET_NAME_LEN);
ZPL_EXIT(zfsvfs);
zpl_exit(zfsvfs, FTAG);
return (0);
}