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Wong" , Dave Chinner , Christoph Hellwig , Dave Chinner , Gao Xiang Subject: [PATCH v2 4/6] xfs: move xfs_dialloc_roll() into xfs_dialloc() Date: Fri, 4 Dec 2020 00:10:26 +0800 Message-Id: <20201203161028.1900929-5-hsiangkao@redhat.com> X-Mailer: git-send-email 2.18.4 In-Reply-To: <20201203161028.1900929-1-hsiangkao@redhat.com> References: <20201203161028.1900929-1-hsiangkao@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Dave Chinner Get rid of the confusing ialloc_context and failure handling around xfs_dialloc() by moving xfs_dialloc_roll() into xfs_dialloc(). Signed-off-by: Dave Chinner Signed-off-by: Gao Xiang --- fs/xfs/libxfs/xfs_ialloc.c | 57 ++++++++++++-------------------------- fs/xfs/libxfs/xfs_ialloc.h | 22 +-------------- fs/xfs/xfs_inode.c | 24 +--------------- 3 files changed, 20 insertions(+), 83 deletions(-) diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c index d5dc3167e2ff..d2d7378abf49 100644 --- a/fs/xfs/libxfs/xfs_ialloc.c +++ b/fs/xfs/libxfs/xfs_ialloc.c @@ -1682,7 +1682,7 @@ xfs_dialloc_ag( return error; } -int +static int xfs_dialloc_roll( struct xfs_trans **tpp, struct xfs_buf *agibp) @@ -1733,30 +1733,18 @@ xfs_dialloc_roll( * Mode is used to tell whether the new inode will need space, and whether it * is a directory. * - * This function is designed to be called twice if it has to do an allocation - * to make more free inodes. On the first call, *IO_agbp should be set to NULL. - * If an inode is available without having to performn an allocation, an inode - * number is returned. In this case, *IO_agbp is set to NULL. If an allocation - * needs to be done, xfs_dialloc returns the current AGI buffer in *IO_agbp. - * The caller should then commit the current transaction, allocate a - * new transaction, and call xfs_dialloc() again, passing in the previous value - * of *IO_agbp. IO_agbp should be held across the transactions. Since the AGI - * buffer is locked across the two calls, the second call is guaranteed to have - * a free inode available. - * * Once we successfully pick an inode its number is returned and the on-disk * data structures are updated. The inode itself is not read in, since doing so * would break ordering constraints with xfs_reclaim. */ int xfs_dialloc( - struct xfs_trans *tp, + struct xfs_trans **tpp, xfs_ino_t parent, umode_t mode, - struct xfs_buf **IO_agbp, xfs_ino_t *inop) { - struct xfs_mount *mp = tp->t_mountp; + struct xfs_mount *mp = (*tpp)->t_mountp; struct xfs_buf *agbp; xfs_agnumber_t agno; int error; @@ -1767,21 +1755,11 @@ xfs_dialloc( struct xfs_ino_geometry *igeo = M_IGEO(mp); bool okalloc = true; - if (*IO_agbp) { - /* - * If the caller passes in a pointer to the AGI buffer, - * continue where we left off before. In this case, we - * know that the allocation group has free inodes. - */ - agbp = *IO_agbp; - goto out_alloc; - } - /* * We do not have an agbp, so select an initial allocation * group for inode allocation. */ - start_agno = xfs_ialloc_ag_select(tp, parent, mode); + start_agno = xfs_ialloc_ag_select(*tpp, parent, mode); if (start_agno == NULLAGNUMBER) { *inop = NULLFSINO; return 0; @@ -1816,7 +1794,7 @@ xfs_dialloc( } if (!pag->pagi_init) { - error = xfs_ialloc_pagi_init(mp, tp, agno); + error = xfs_ialloc_pagi_init(mp, *tpp, agno); if (error) goto out_error; } @@ -1831,7 +1809,7 @@ xfs_dialloc( * Then read in the AGI buffer and recheck with the AGI buffer * lock held. */ - error = xfs_ialloc_read_agi(mp, tp, agno, &agbp); + error = xfs_ialloc_read_agi(mp, *tpp, agno, &agbp); if (error) goto out_error; @@ -1844,9 +1822,9 @@ xfs_dialloc( goto nextag_relse_buffer; - error = xfs_ialloc_ag_alloc(tp, agbp, &ialloced); + error = xfs_ialloc_ag_alloc(*tpp, agbp, &ialloced); if (error) { - xfs_trans_brelse(tp, agbp); + xfs_trans_brelse(*tpp, agbp); if (error != -ENOSPC) goto out_error; @@ -1858,21 +1836,23 @@ xfs_dialloc( if (ialloced) { /* - * We successfully allocated some inodes, return - * the current context to the caller so that it - * can commit the current transaction and call - * us again where we left off. + * We successfully allocated some inodes, roll the + * transaction so they can allocate one of the free + * inodes we just prepared for them. */ ASSERT(pag->pagi_freecount > 0); xfs_perag_put(pag); - *IO_agbp = agbp; + error = xfs_dialloc_roll(tpp, agbp); + if (error) + return error; + *inop = NULLFSINO; - return 0; + goto out_alloc; } nextag_relse_buffer: - xfs_trans_brelse(tp, agbp); + xfs_trans_brelse(*tpp, agbp); nextag: xfs_perag_put(pag); if (++agno == mp->m_sb.sb_agcount) @@ -1884,8 +1864,7 @@ xfs_dialloc( } out_alloc: - *IO_agbp = NULL; - return xfs_dialloc_ag(tp, agbp, parent, inop); + return xfs_dialloc_ag(*tpp, agbp, parent, inop); out_error: xfs_perag_put(pag); return error; diff --git a/fs/xfs/libxfs/xfs_ialloc.h b/fs/xfs/libxfs/xfs_ialloc.h index a145e2a72530..13810ffe4af9 100644 --- a/fs/xfs/libxfs/xfs_ialloc.h +++ b/fs/xfs/libxfs/xfs_ialloc.h @@ -32,40 +32,20 @@ xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o) return xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog); } -/* XXX: will be removed in the following patch */ -int -xfs_dialloc_roll( - struct xfs_trans **tpp, - struct xfs_buf *agibp); - /* * Allocate an inode on disk. * Mode is used to tell whether the new inode will need space, and whether * it is a directory. * - * To work within the constraint of one allocation per transaction, - * xfs_dialloc() is designed to be called twice if it has to do an - * allocation to make more free inodes. If an inode is - * available without an allocation, agbp would be set to the current - * agbp and alloc_done set to false. - * If an allocation needed to be done, agbp would be set to the - * inode header of the allocation group and alloc_done set to true. - * The caller should then commit the current transaction and allocate a new - * transaction. xfs_dialloc() should then be called again with - * the agbp value returned from the previous call. - * * Once we successfully pick an inode its number is returned and the * on-disk data structures are updated. The inode itself is not read * in, since doing so would break ordering constraints with xfs_reclaim. - * - * *agbp should be set to NULL on the first call, *alloc_done set to FALSE. */ int /* error */ xfs_dialloc( - struct xfs_trans *tp, /* transaction pointer */ + struct xfs_trans **tpp, /* double pointer of transaction */ xfs_ino_t parent, /* parent inode (directory) */ umode_t mode, /* mode bits for new inode */ - struct xfs_buf **agbp, /* buf for a.g. inode header */ xfs_ino_t *inop); /* inode number allocated */ /* diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index 34eca1624397..c039fc56b396 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -909,7 +909,6 @@ xfs_dir_ialloc( locked. */ { xfs_inode_t *ip; - xfs_buf_t *ialloc_context = NULL; xfs_ino_t pino = dp ? dp->i_ino : 0; xfs_ino_t ino; int error; @@ -928,31 +927,10 @@ xfs_dir_ialloc( * commit so that no other process can steal the inode(s) that we've * just allocated. */ - error = xfs_dialloc(*tpp, pino, mode, ialloc_context, &ino); + error = xfs_dialloc(tpp, pino, mode, &ino); if (error) return error; - /* - * If the AGI buffer is non-NULL, then we were unable to get an - * inode in one operation. We need to commit the current - * transaction and call xfs_ialloc() then. It is guaranteed - * to succeed the second time. - */ - if (ialloc_context) { - error = xfs_dialloc_roll(tpp, ialloc_context); - if (error) - return error; - /* - * Call dialloc again. Since we've locked out all other - * allocations in this allocation group, this call should - * always succeed. - */ - error = xfs_dialloc(*tpp, pino, mode, ialloc_context, &ino); - if (error) - return error; - ASSERT(!ialloc_context); - } - if (ino == NULLFSINO) return -ENOSPC; -- 2.18.4