Re: [PATCH 17/22] xfs: simplify xfs_dialloc_select_ag() return values
From: "Darrick J. Wong" <djwong@kernel.org>
Date: 2021-05-12 22:57:48
On Thu, May 06, 2021 at 05:20:49PM +1000, Dave Chinner wrote:
From: Dave Chinner <redacted> 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 <redacted>
Woo nice cleanup! Reviewed-by: Darrick J. Wong <djwong@kernel.org> --D
quoted hunk ↗ jump to hunk
--- fs/xfs/libxfs/xfs_ialloc.c | 23 ++++++++--------------- fs/xfs/xfs_inode.c | 3 --- 2 files changed, 8 insertions(+), 18 deletions(-)diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c index 4540fbcd68a3..872591e8f5cb 100644 --- a/fs/xfs/libxfs/xfs_ialloc.c +++ b/fs/xfs/libxfs/xfs_ialloc.c@@ -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; }diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index 25910b145d70..3918c99fa95b 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c@@ -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)-- 2.31.1