xfs: shrink failure needs to hold AGI buffer

xfs: shrink failure needs to hold AGI buffer

Chandan reported a AGI/AGF lock order hang on xfs/168 during recent
testing. The cause of the problem was the task running xfs_growfs
to shrink the filesystem. A failure occurred trying to remove the
free space from the btrees that the shrink would make disappear,
and that meant it ran the error handling for a partial failure.

This error path involves restoring the per-ag block reservations,
and that requires calculating the amount of space needed to be
reserved for the free inode btree. The growfs operation hung here:

[18679.536829]  down+0x71/0xa0
[18679.537657]  xfs_buf_lock+0xa4/0x290 [xfs]
[18679.538731]  xfs_buf_find_lock+0xf7/0x4d0 [xfs]
[18679.539920]  xfs_buf_lookup.constprop.0+0x289/0x500 [xfs]
[18679.542628]  xfs_buf_get_map+0x2b3/0xe40 [xfs]
[18679.547076]  xfs_buf_read_map+0xbb/0x900 [xfs]
[18679.562616]  xfs_trans_read_buf_map+0x449/0xb10 [xfs]
[18679.569778]  xfs_read_agi+0x1cd/0x500 [xfs]
[18679.573126]  xfs_ialloc_read_agi+0xc2/0x5b0 [xfs]
[18679.578708]  xfs_finobt_calc_reserves+0xe7/0x4d0 [xfs]
[18679.582480]  xfs_ag_resv_init+0x2c5/0x490 [xfs]
[18679.586023]  xfs_ag_shrink_space+0x736/0xd30 [xfs]
[18679.590730]  xfs_growfs_data_private.isra.0+0x55e/0x990 [xfs]
[18679.599764]  xfs_growfs_data+0x2f1/0x410 [xfs]
[18679.602212]  xfs_file_ioctl+0xd1e/0x1370 [xfs]

trying to get the AGI lock. The AGI lock was held by a fstress task
trying to do an inode allocation, and it was waiting on the AGF
lock to allocate a new inode chunk on disk. Hence deadlock.

The fix for this is for the growfs code to hold the AGI over the
transaction roll it does in the error path. It already holds the AGF
locked across this, and that is what causes the lock order inversion
in the xfs_ag_resv_init() call.

Reported-by: Chandan Babu R <chandanbabu@kernel.org>
Fixes: 46141dc891f7 ("xfs: introduce xfs_ag_shrink_space()")
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>