[PATCH 08/10] xfs: look at m_frextents in xfs_iomap_prealloc_size for RT allocations

Christoph Hellwig
2024-02-23T07:16:03Z

Add a check for files on the RT subvolume and use m_frextents instead
of m_fdblocks to adjust the preallocation size.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/xfs_iomap.c | 42 ++++++++++++++++++++++++++++++------------
1 file changed, 30 insertions(+), 12 deletions(-)

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 18c8f168b1532d..e6abe56d1f1f23 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -27,6 +27,7 @@
#include "xfs_dquot_item.h"
#include "xfs_dquot.h"
#include "xfs_reflink.h"
+#include "xfs_rtbitmap.h"

#define XFS_ALLOC_ALIGN(mp, off) \
(((off) >> mp->m_allocsize_log) << mp->m_allocsize_log)
@@ -398,6 +399,29 @@ xfs_quota_calc_throttle(
}
}

+static int64_t
+xfs_iomap_freesp(
+ struct percpu_counter *counter,
+ uint64_t low_space[XFS_LOWSP_MAX],
+ int *shift)
+{
+ int64_t freesp;
+
+ freesp = percpu_counter_read_positive(counter);
+ if (freesp < low_space[XFS_LOWSP_5_PCNT]) {
+ *shift = 2;
+ if (freesp < low_space[XFS_LOWSP_4_PCNT])
+ (*shift)++;
+ if (freesp < low_space[XFS_LOWSP_3_PCNT])
+ (*shift)++;
+ if (freesp < low_space[XFS_LOWSP_2_PCNT])
+ (*shift)++;
+ if (freesp < low_space[XFS_LOWSP_1_PCNT])
+ (*shift)++;
+ }
+ return freesp;
+}
+
/*
* If we don't have a user specified preallocation size, dynamically increase
* the preallocation size as the size of the file grows. Cap the maximum size
@@ -480,18 +504,12 @@ xfs_iomap_prealloc_size(
alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(XFS_MAX_BMBT_EXTLEN),
alloc_blocks);

- freesp = percpu_counter_read_positive(&mp->m_fdblocks);
- if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) {
- shift = 2;
- if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT])
- shift++;
- if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT])
- shift++;
- if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT])
- shift++;
- if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT])
- shift++;
- }
+ if (unlikely(XFS_IS_REALTIME_INODE(ip)))
+ freesp = xfs_rtx_to_rtb(mp, xfs_iomap_freesp(&mp->m_frextents,
+ mp->m_low_rtexts, &shift));
+ else
+ freesp = xfs_iomap_freesp(&mp->m_fdblocks, mp->m_low_space,
+ &shift);

/*
* Check each quota to cap the prealloc size, provide a shift value to
--
2.39.2