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xfs: simplify xfs_dialloc_select_ag() return values 

The only caller of xfs_dialloc_select_ag() will always return
-ENOSPC to it's caller if the agbp returned from
xfs_dialloc_select_ag() is NULL. IOWs, failure to find a candidate
AGI we can allocate inodes from is always an ENOSPC condition, so
move this logic up into xfs_dialloc_select_ag() so we can simplify
the return logic in this function.

xfs_dialloc_select_ag() now only ever returns 0 with a locked
agbp, or an error with no agbp.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Dave Chinner 2021-06-02 10:48:24 +10:00 committed by Dave Chinner
parent 50f02fe333
commit 4268547305
2 changed files with 8 additions and 18 deletions
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23
fs/xfs/libxfs/xfs_ialloc.c
View File

@ -1717,7 +1717,7 @@ xfs_dialloc_roll(
* This function will ensure that the selected AG has free inodes available to
* allocate from. The selected AGI will be returned locked to the caller, and it
* will allocate more free inodes if required. If no free inodes are found or
* can be allocated, no AGI will be returned.
* can be allocated, -ENOSPC be returned.
*/
int
xfs_dialloc_select_ag(
@ -1730,7 +1730,6 @@ xfs_dialloc_select_ag(
struct xfs_buf *agbp;
xfs_agnumber_t agno;
int error;
bool noroom = false;
xfs_agnumber_t start_agno;
struct xfs_perag *pag;
struct xfs_ino_geometry *igeo = M_IGEO(mp);
@ -1744,7 +1743,7 @@ xfs_dialloc_select_ag(
*/
start_agno = xfs_ialloc_ag_select(*tpp, parent, mode);
if (start_agno == NULLAGNUMBER)
return 0;
return -ENOSPC;
/*
* If we have already hit the ceiling of inode blocks then clear
@ -1757,7 +1756,6 @@ xfs_dialloc_select_ag(
if (igeo->maxicount &&
percpu_counter_read_positive(&mp->m_icount) + igeo->ialloc_inos
> igeo->maxicount) {
noroom = true;
okalloc = false;
}
@ -1794,10 +1792,8 @@ xfs_dialloc_select_ag(
if (error)
break;
if (pag->pagi_freecount) {
xfs_perag_put(pag);
if (pag->pagi_freecount)
goto found_ag;
}
if (!okalloc)
goto nextag_relse_buffer;
@ -1805,9 +1801,6 @@ xfs_dialloc_select_ag(
error = xfs_ialloc_ag_alloc(*tpp, agbp, pag);
if (error < 0) {
xfs_trans_brelse(*tpp, agbp);
if (error == -ENOSPC)
error = 0;
break;
}
@ -1818,12 +1811,11 @@ xfs_dialloc_select_ag(
* allocate one of the new inodes.
*/
ASSERT(pag->pagi_freecount > 0);
xfs_perag_put(pag);
error = xfs_dialloc_roll(tpp, agbp);
if (error) {
xfs_buf_relse(agbp);
return error;
break;
}
goto found_ag;
}
@ -1831,16 +1823,17 @@ xfs_dialloc_select_ag(
nextag_relse_buffer:
xfs_trans_brelse(*tpp, agbp);
nextag:
xfs_perag_put(pag);
if (++agno == mp->m_sb.sb_agcount)
agno = 0;
if (agno == start_agno)
return noroom ? -ENOSPC : 0;
break;
xfs_perag_put(pag);
}
xfs_perag_put(pag);
return error;
return error ? error : -ENOSPC;
found_ag:
xfs_perag_put(pag);
*IO_agbp = agbp;
return 0;
}

3
fs/xfs/xfs_inode.c
View File

@ -923,9 +923,6 @@ xfs_dir_ialloc(
if (error)
return error;
if (!agibp)
return -ENOSPC;
/* Allocate an inode from the selected AG */
error = xfs_dialloc_ag(*tpp, agibp, parent_ino, &ino);
if (error)