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xfs: Refactoring the nagcount and delta calculation

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Introduce xfs_growfs_compute_delta() to calculate the nagcount
and delta blocks and refactor the code from xfs_growfs_data_private().
No functional changes.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nirjhar Roy (IBM) <nirjhar.roy.lists@gmail.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
This commit is contained in:
Nirjhar Roy (IBM)
2026-02-11 19:25:13 +05:30
committed by Carlos Maiolino
parent 18c16f602a
commit a49b7ff63f
3 changed files with 33 additions and 15 deletions
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28
fs/xfs/libxfs/xfs_ag.c
View File

@@ -872,6 +872,34 @@ xfs_ag_shrink_space(
return err2;
}
void
xfs_growfs_compute_deltas(
struct xfs_mount *mp,
xfs_rfsblock_t nb,
int64_t *deltap,
xfs_agnumber_t *nagcountp)
{
xfs_rfsblock_t nb_div, nb_mod;
int64_t delta;
xfs_agnumber_t nagcount;
nb_div = nb;
nb_mod = do_div(nb_div, mp->m_sb.sb_agblocks);
if (nb_mod && nb_mod >= XFS_MIN_AG_BLOCKS)
nb_div++;
else if (nb_mod)
nb = nb_div * mp->m_sb.sb_agblocks;
if (nb_div > XFS_MAX_AGNUMBER + 1) {
nb_div = XFS_MAX_AGNUMBER + 1;
nb = nb_div * mp->m_sb.sb_agblocks;
}
nagcount = nb_div;
delta = nb - mp->m_sb.sb_dblocks;
*deltap = delta;
*nagcountp = nagcount;
}
/*
* Extent the AG indicated by the @id by the length passed in
*/

3
fs/xfs/libxfs/xfs_ag.h
View File

@@ -331,6 +331,9 @@ struct aghdr_init_data {
int xfs_ag_init_headers(struct xfs_mount *mp, struct aghdr_init_data *id);
int xfs_ag_shrink_space(struct xfs_perag *pag, struct xfs_trans **tpp,
xfs_extlen_t delta);
void
xfs_growfs_compute_deltas(struct xfs_mount *mp, xfs_rfsblock_t nb,
int64_t *deltap, xfs_agnumber_t *nagcountp);
int xfs_ag_extend_space(struct xfs_perag *pag, struct xfs_trans *tp,
xfs_extlen_t len);
int xfs_ag_get_geometry(struct xfs_perag *pag, struct xfs_ag_geometry *ageo);

17
fs/xfs/xfs_fsops.c
View File

@@ -95,18 +95,17 @@ xfs_growfs_data_private(
struct xfs_growfs_data *in) /* growfs data input struct */
{
xfs_agnumber_t oagcount = mp->m_sb.sb_agcount;
xfs_rfsblock_t nb = in->newblocks;
struct xfs_buf *bp;
int error;
xfs_agnumber_t nagcount;
xfs_agnumber_t nagimax = 0;
xfs_rfsblock_t nb, nb_div, nb_mod;
int64_t delta;
bool lastag_extended = false;
struct xfs_trans *tp;
struct aghdr_init_data id = {};
struct xfs_perag *last_pag;
nb = in->newblocks;
error = xfs_sb_validate_fsb_count(&mp->m_sb, nb);
if (error)
return error;
@@ -125,20 +124,8 @@ xfs_growfs_data_private(
mp->m_sb.sb_rextsize);
if (error)
return error;
xfs_growfs_compute_deltas(mp, nb, &delta, &nagcount);
nb_div = nb;
nb_mod = do_div(nb_div, mp->m_sb.sb_agblocks);
if (nb_mod && nb_mod >= XFS_MIN_AG_BLOCKS)
nb_div++;
else if (nb_mod)
nb = nb_div * mp->m_sb.sb_agblocks;
if (nb_div > XFS_MAX_AGNUMBER + 1) {
nb_div = XFS_MAX_AGNUMBER + 1;
nb = nb_div * mp->m_sb.sb_agblocks;
}
nagcount = nb_div;
delta = nb - mp->m_sb.sb_dblocks;
/*
* Reject filesystems with a single AG because they are not
* supported, and reject a shrink operation that would cause a