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NFS client bugfix for Linux 5.7

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Bugfix:
 - Fix an ABBA spinlock issue in pnfs_update_layout()
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Merge tag 'nfs-for-5.7-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfix from Trond Myklebust:
 "Fix an ABBA spinlock issue in pnfs_update_layout()"

* tag 'nfs-for-5.7-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFS: Fix an ABBA spinlock issue in pnfs_update_layout()
This commit is contained in:
Linus Torvalds 2020-04-16 18:14:13 -07:00
commit 7a56db0299
1 changed files with 2 additions and 1 deletions
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3
fs/nfs/pnfs.c
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@ -2023,6 +2023,7 @@ lookup_again:
goto lookup_again;
}
spin_unlock(&ino->i_lock);
first = true;
status = nfs4_select_rw_stateid(ctx->state,
iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
@ -2032,12 +2033,12 @@ lookup_again:
trace_pnfs_update_layout(ino, pos, count,
iomode, lo, lseg,
PNFS_UPDATE_LAYOUT_INVALID_OPEN);
spin_unlock(&ino->i_lock);
nfs4_schedule_stateid_recovery(server, ctx->state);
pnfs_clear_first_layoutget(lo);
pnfs_put_layout_hdr(lo);
goto lookup_again;
}
spin_lock(&ino->i_lock);
} else {
nfs4_stateid_copy(&stateid, &lo->plh_stateid);
}