On 25 Feb 2022 at 10:40, Darrick J. Wong wrote:
> On Thu, Feb 24, 2022 at 06:32:09PM +0530, Chandan Babu R wrote:
>> The following changes are made to enable userspace to obtain 64-bit extent
>> counters,
>> 1. Carve out a new 64-bit field xfs_bulkstat->bs_extents64 from
>> xfs_bulkstat->bs_pad[] to hold 64-bit extent counter.
>> 2. Define the new flag XFS_BULK_IREQ_BULKSTAT for userspace to indicate that
>> it is capable of receiving 64-bit extent counters.
>>
>> Suggested-by: Darrick J. Wong <djwong@xxxxxxxxxx>
>> Signed-off-by: Chandan Babu R <chandan.babu@xxxxxxxxxx>
>> ---
>> fs/xfs/libxfs/xfs_fs.h | 20 ++++++++++++++++----
>> fs/xfs/xfs_ioctl.c | 3 +++
>> fs/xfs/xfs_itable.c | 30 ++++++++++++++++++++++++++++--
>> fs/xfs/xfs_itable.h | 6 ++++--
>> fs/xfs/xfs_iwalk.h | 2 +-
>> 5 files changed, 52 insertions(+), 9 deletions(-)
>>
>> diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
>> index 2204d49d0c3a..31ccbff2f16c 100644
>> --- a/fs/xfs/libxfs/xfs_fs.h
>> +++ b/fs/xfs/libxfs/xfs_fs.h
>> @@ -378,7 +378,7 @@ struct xfs_bulkstat {
>> uint32_t bs_extsize_blks; /* extent size hint, blocks */
>>
>> uint32_t bs_nlink; /* number of links */
>> - uint32_t bs_extents; /* number of extents */
>> + uint32_t bs_extents; /* 32-bit data fork extent counter */
>> uint32_t bs_aextents; /* attribute number of extents */
>> uint16_t bs_version; /* structure version */
>> uint16_t bs_forkoff; /* inode fork offset in bytes */
>> @@ -387,8 +387,9 @@ struct xfs_bulkstat {
>> uint16_t bs_checked; /* checked inode metadata */
>> uint16_t bs_mode; /* type and mode */
>> uint16_t bs_pad2; /* zeroed */
>> + uint64_t bs_extents64; /* 64-bit data fork extent counter */
>>
>> - uint64_t bs_pad[7]; /* zeroed */
>> + uint64_t bs_pad[6]; /* zeroed */
>> };
>>
>> #define XFS_BULKSTAT_VERSION_V1 (1)
>> @@ -469,8 +470,19 @@ struct xfs_bulk_ireq {
>> */
>> #define XFS_BULK_IREQ_SPECIAL (1 << 1)
>>
>> -#define XFS_BULK_IREQ_FLAGS_ALL (XFS_BULK_IREQ_AGNO | \
>> - XFS_BULK_IREQ_SPECIAL)
>> +/*
>> + * Return data fork extent count via xfs_bulkstat->bs_extents64 field and assign
>> + * 0 to xfs_bulkstat->bs_extents when the flag is set. Otherwise, use
>> + * xfs_bulkstat->bs_extents for returning data fork extent count and set
>> + * xfs_bulkstat->bs_extents64 to 0. In the second case, return -EOVERFLOW and
>> + * assign 0 to xfs_bulkstat->bs_extents if data fork extent count is larger than
>> + * XFS_MAX_EXTCNT_DATA_FORK_OLD.
>> + */
>> +#define XFS_BULK_IREQ_NREXT64 (1 << 2)
>> +
>> +#define XFS_BULK_IREQ_FLAGS_ALL (XFS_BULK_IREQ_AGNO | \
>> + XFS_BULK_IREQ_SPECIAL | \
>> + XFS_BULK_IREQ_NREXT64)
>>
>> /* Operate on the root directory inode. */
>> #define XFS_BULK_IREQ_SPECIAL_ROOT (1)
>> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
>> index 2515fe8299e1..22947c5ffd34 100644
>> --- a/fs/xfs/xfs_ioctl.c
>> +++ b/fs/xfs/xfs_ioctl.c
>> @@ -813,6 +813,9 @@ xfs_bulk_ireq_setup(
>> if (XFS_INO_TO_AGNO(mp, breq->startino) >= mp->m_sb.sb_agcount)
>> return -ECANCELED;
>>
>> + if (hdr->flags & XFS_BULK_IREQ_NREXT64)
>> + breq->flags |= XFS_IBULK_NREXT64;
>> +
>> return 0;
>> }
>>
>> diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
>> index c08c79d9e311..11e5245756f7 100644
>> --- a/fs/xfs/xfs_itable.c
>> +++ b/fs/xfs/xfs_itable.c
>> @@ -20,6 +20,7 @@
>> #include "xfs_icache.h"
>> #include "xfs_health.h"
>> #include "xfs_trans.h"
>> +#include "xfs_errortag.h"
>>
>> /*
>> * Bulk Stat
>> @@ -64,6 +65,7 @@ xfs_bulkstat_one_int(
>> struct xfs_inode *ip; /* incore inode pointer */
>> struct inode *inode;
>> struct xfs_bulkstat *buf = bc->buf;
>> + xfs_extnum_t nextents;
>> int error = -EINVAL;
>>
>> if (xfs_internal_inum(mp, ino))
>> @@ -102,7 +104,27 @@ xfs_bulkstat_one_int(
>>
>> buf->bs_xflags = xfs_ip2xflags(ip);
>> buf->bs_extsize_blks = ip->i_extsize;
>> - buf->bs_extents = xfs_ifork_nextents(&ip->i_df);
>> +
>> + nextents = xfs_ifork_nextents(&ip->i_df);
>> + if (!(bc->breq->flags & XFS_IBULK_NREXT64)) {
>> + xfs_extnum_t max_nextents = XFS_MAX_EXTCNT_DATA_FORK_OLD;
>
> Nit: space between type ^^^^^ and variable name.
>
I will fix this.
>> +
>> + if (unlikely(XFS_TEST_ERROR(false, mp,
>> + XFS_ERRTAG_REDUCE_MAX_IEXTENTS)))
>> + max_nextents = 10;
>> +
>> + if (nextents > max_nextents) {
>> + xfs_iunlock(ip, XFS_ILOCK_SHARED);
>> + xfs_irele(ip);
>> + error = -EOVERFLOW;
>> + goto out;
>> + }
>> +
>> + buf->bs_extents = nextents;
>> + } else {
>> + buf->bs_extents64 = nextents;
>> + }
>> +
>> xfs_bulkstat_health(ip, buf);
>> buf->bs_aextents = xfs_ifork_nextents(ip->i_afp);
>> buf->bs_forkoff = XFS_IFORK_BOFF(ip);
>> @@ -256,6 +278,7 @@ xfs_bulkstat(
>> .breq = breq,
>> };
>> struct xfs_trans *tp;
>> + unsigned int iwalk_flags = 0;
>> int error;
>>
>> if (breq->mnt_userns != &init_user_ns) {
>> @@ -279,7 +302,10 @@ xfs_bulkstat(
>> if (error)
>> goto out;
>>
>> - error = xfs_iwalk(breq->mp, tp, breq->startino, breq->flags,
>> + if (breq->flags & XFS_IBULK_SAME_AG)
>> + iwalk_flags |= XFS_IWALK_SAME_AG;
>> +
>> + error = xfs_iwalk(breq->mp, tp, breq->startino, iwalk_flags,
>> xfs_bulkstat_iwalk, breq->icount, &bc);
>> xfs_trans_cancel(tp);
>> out:
>> diff --git a/fs/xfs/xfs_itable.h b/fs/xfs/xfs_itable.h
>> index 7078d10c9b12..2cb5611c873e 100644
>> --- a/fs/xfs/xfs_itable.h
>> +++ b/fs/xfs/xfs_itable.h
>> @@ -13,11 +13,13 @@ struct xfs_ibulk {
>> xfs_ino_t startino; /* start with this inode */
>> unsigned int icount; /* number of elements in ubuffer */
>> unsigned int ocount; /* number of records returned */
>> - unsigned int flags; /* see XFS_IBULK_FLAG_* */
>> + unsigned long long flags; /* see XFS_IBULK_FLAG_* */
>
> I wonder if this could have been left an unsigned int and the flags
> below assigned adjacent bits instead of widening the field...
>
Yes, this should be unsigned int because ...
>> };
>>
>> /* Only iterate within the same AG as startino */
>> -#define XFS_IBULK_SAME_AG (XFS_IWALK_SAME_AG)
>> +#define XFS_IBULK_SAME_AG (1ULL << 0)
>> +
>> +#define XFS_IBULK_NREXT64 (1ULL << 32)
>
> ...but was your purpose here to make it really obvious that we've
> separated IWALK and IBULK?
>
... Sorry, I should have fixed this when I had removed the tight integration
with IWALK. This should have been defined as,
#define XFS_IBULK_NREXT64 (1ULL << 1)
I will fix this up as well.
>> /*
>> * Advance the user buffer pointer by one record of the given size. If the
>> diff --git a/fs/xfs/xfs_iwalk.h b/fs/xfs/xfs_iwalk.h
>> index 37a795f03267..3a68766fd909 100644
>> --- a/fs/xfs/xfs_iwalk.h
>> +++ b/fs/xfs/xfs_iwalk.h
>> @@ -26,7 +26,7 @@ int xfs_iwalk_threaded(struct xfs_mount *mp, xfs_ino_t startino,
>> unsigned int inode_records, bool poll, void *data);
>>
>> /* Only iterate inodes within the same AG as @startino. */
>> -#define XFS_IWALK_SAME_AG (0x1)
>> +#define XFS_IWALK_SAME_AG (1 << 0)
>>
>> #define XFS_IWALK_FLAGS_ALL (XFS_IWALK_SAME_AG)
>>
>> --
>> 2.30.2
>>
--
chandan
