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Wong" To: allison.henderson@oracle.com Cc: linux-xfs@vger.kernel.org Subject: Re: [PATCH v4 14/27] xfs: extend transaction reservations for parent attributes Message-ID: References: <20221021222936.934426-1-allison.henderson@oracle.com> <20221021222936.934426-15-allison.henderson@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221021222936.934426-15-allison.henderson@oracle.com> Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org On Fri, Oct 21, 2022 at 03:29:23PM -0700, allison.henderson@oracle.com wrote: > From: Allison Henderson > > We need to add, remove or modify parent pointer attributes during > create/link/unlink/rename operations atomically with the dirents in the > parent directories being modified. This means they need to be modified > in the same transaction as the parent directories, and so we need to add > the required space for the attribute modifications to the transaction > reservations. > > Signed-off-by: Dave Chinner > Signed-off-by: Allison Henderson > --- > fs/xfs/libxfs/xfs_trans_resv.c | 303 +++++++++++++++++++++++++++------ > 1 file changed, 249 insertions(+), 54 deletions(-) > > diff --git a/fs/xfs/libxfs/xfs_trans_resv.c b/fs/xfs/libxfs/xfs_trans_resv.c > index 5b2f27cbdb80..756b6f38c385 100644 > --- a/fs/xfs/libxfs/xfs_trans_resv.c > +++ b/fs/xfs/libxfs/xfs_trans_resv.c > @@ -19,6 +19,9 @@ > #include "xfs_trans.h" > #include "xfs_qm.h" > #include "xfs_trans_space.h" > +#include "xfs_attr_item.h" > +#include "xfs_log.h" > +#include "xfs_da_format.h" > > #define _ALLOC true > #define _FREE false > @@ -426,23 +429,62 @@ xfs_calc_itruncate_reservation_minlogsize( > * the two directory btrees: 2 * (max depth + v2) * dir block size > * the two directory bmap btrees: 2 * max depth * block size > * And the bmap_finish transaction can free dir and bmap blocks (two sets > - * of bmap blocks) giving: > + * of bmap blocks) giving (t2): > * the agf for the ags in which the blocks live: 3 * sector size > * the agfl for the ags in which the blocks live: 3 * sector size > * the superblock for the free block count: sector size > * the allocation btrees: 3 exts * 2 trees * (2 * max depth - 1) * block size > + * If parent pointers are enabled (t3), then each transaction in the chain > + * must be capable of setting or removing the extended attribute > + * containing the parent information. It must also be able to handle > + * the three xattr intent items that track the progress of the parent > + * pointer update. To check my assumptions here: For a standard rename, the three xattr intent items are (1) replacing the pptr for the source file; (2) removing the pptr on the dest file; and (3) adding a pptr for the whiteout file in the src dir? For an RENAME_EXCHANGE, there are two xattr intent items to replace the pptr for both src and dest files. Link counts don't change and there is no whiteout, correct? > */ > STATIC uint > xfs_calc_rename_reservation( > struct xfs_mount *mp) > { > - return XFS_DQUOT_LOGRES(mp) + > - max((xfs_calc_inode_res(mp, 5) + > - xfs_calc_buf_res(2 * XFS_DIROP_LOG_COUNT(mp), > - XFS_FSB_TO_B(mp, 1))), > - (xfs_calc_buf_res(7, mp->m_sb.sb_sectsize) + > - xfs_calc_buf_res(xfs_allocfree_block_count(mp, 3), > - XFS_FSB_TO_B(mp, 1)))); > + unsigned int overhead = XFS_DQUOT_LOGRES(mp); > + struct xfs_trans_resv *resp = M_RES(mp); > + unsigned int t1, t2, t3 = 0; > + > + t1 = xfs_calc_inode_res(mp, 5) + > + xfs_calc_buf_res(2 * XFS_DIROP_LOG_COUNT(mp), > + XFS_FSB_TO_B(mp, 1)); > + > + t2 = xfs_calc_buf_res(7, mp->m_sb.sb_sectsize) + > + xfs_calc_buf_res(xfs_allocfree_block_count(mp, 3), > + XFS_FSB_TO_B(mp, 1)); > + > + if (xfs_has_parent(mp)) { > + t3 = max(resp->tr_attrsetm.tr_logres, > + resp->tr_attrrm.tr_logres); > + overhead += 4 * (sizeof(struct xfs_attri_log_item) + I'm not sure why this multiplies by four then? The log reservation is for the ondisk structures, so the sizeof should be for xfs_attri_log_format, not xfs_attri_log_item. > + (2 * xlog_calc_iovec_len(XATTR_NAME_MAX)) + I guess the 2 * XATTR_NAME_MAX is to log replacing the old name with the new name? > + xlog_calc_iovec_len( > + sizeof(struct xfs_parent_name_rec))); And this last one is for the xattr "name", which is just the (parent, gen, diroffset) structure? I'm concerned about the overhead becoming unnecessarily large here, since that all comes out to: 4 * (48 + (2 * 256) + 16) = 2304 bytes? Or 1728 bytes if we only multiply by 3? Ok, maybe I'm not so concerned after all; 2.3k isn't that large as compared to logging entire fsblock buffers. These namespace transactions are 300-400KB in size. Could this be reduced further, though? For a regular rename, we're doing a replace, a link, and an unlink. (48 + (2 * 256)) + (48 + 256) + (48) = 912 bytes For a RENAME_EXCHANGE, we're doing two replaces: (48 + (2 * 256)) + (48 + (2 * 256)) = 1120 bytes I'm glad that 1728 is larger than both of those. :) Looking forward in this patch, I see the same open-coded overhead calculations and wonder what you think of the following refactoring: static inline unsigned int xfs_calc_pptr_link_overhead(void) { return sizeof(struct xfs_attri_log_format) + xlog_calc_iovec_len(XATTR_NAME_MAX) + xlog_calc_iovec_len(sizeof(struct xfs_parent_name_rec)); } static inline unsigned int xfs_calc_pptr_unlink_overhead(void) { return sizeof(struct xfs_attri_log_format) + xlog_calc_iovec_len(sizeof(struct xfs_parent_name_rec)); } static inline unsigned int xfs_calc_pptr_replace_overhead(void) { return sizeof(struct xfs_attri_log_format) + xlog_calc_iovec_len(XATTR_NAME_MAX) + xlog_calc_iovec_len(XATTR_NAME_MAX) + xlog_calc_iovec_len(sizeof(struct xfs_parent_name_rec)); } And then the above becomes: if (xfs_has_parent(mp)) { unsigned int rename_overhead, exchange_overhead; t3 = max(resp->tr_attrsetm.tr_logres, resp->tr_attrrm.tr_logres); /* * For a standard rename, the three xattr intent log items * are (1) replacing the pptr for the source file; (2) * removing the pptr on the dest file; and (3) adding a * pptr for the whiteout file in the src dir. * * For an RENAME_EXCHANGE, there are two xattr intent * items to replace the pptr for both src and dest * files. Link counts don't change and there is no * whiteout. * * In the worst case we can end up relogging all log * intent items to allow the log tail to move ahead, so * they become overhead added to each transaction in a * processing chain. */ rename_overhead = xfs_calc_pptr_replace_overhead() + xfs_calc_pptr_unlink_overhead() + xfs_calc_pptr_link_overhead(); exchange_overhead = 2 * xfs_calc_pptr_replace_overhead(); overhead += max(rename_overhead, exchange_overhead); } You might want to come up with better names though. > + } > + > + return overhead + max3(t1, t2, t3); > +} > + > +static inline unsigned int > +xfs_rename_log_count( > + struct xfs_mount *mp, > + struct xfs_trans_resv *resp) > +{ > + /* One for the rename, one more for freeing blocks */ > + unsigned int ret = XFS_RENAME_LOG_COUNT; > + > + /* > + * Pre-reserve enough log reservation to handle the transaction > + * rolling needed to remove or add one parent pointer. > + */ > + if (xfs_has_parent(mp)) > + ret += max(resp->tr_attrsetm.tr_logcount, > + resp->tr_attrrm.tr_logcount); > + > + return ret; > } > > /* > @@ -459,6 +501,23 @@ xfs_calc_iunlink_remove_reservation( > 2 * M_IGEO(mp)->inode_cluster_size; > } > > +static inline unsigned int > +xfs_link_log_count( > + struct xfs_mount *mp, > + struct xfs_trans_resv *resp) > +{ > + unsigned int ret = XFS_LINK_LOG_COUNT; > + > + /* > + * Pre-reserve enough log reservation to handle the transaction > + * rolling needed to add one parent pointer. > + */ > + if (xfs_has_parent(mp)) > + ret += resp->tr_attrsetm.tr_logcount; > + > + return ret; > +} > + > /* > * For creating a link to an inode: > * the parent directory inode: inode size > @@ -475,14 +534,27 @@ STATIC uint > xfs_calc_link_reservation( > struct xfs_mount *mp) > { > - return XFS_DQUOT_LOGRES(mp) + > - xfs_calc_iunlink_remove_reservation(mp) + > - max((xfs_calc_inode_res(mp, 2) + > - xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), > - XFS_FSB_TO_B(mp, 1))), > - (xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) + > - xfs_calc_buf_res(xfs_allocfree_block_count(mp, 1), > - XFS_FSB_TO_B(mp, 1)))); > + unsigned int overhead = XFS_DQUOT_LOGRES(mp); > + struct xfs_trans_resv *resp = M_RES(mp); > + unsigned int t1, t2, t2_1, t2_2, t3 = 0; > + > + t1 = xfs_calc_iunlink_remove_reservation(mp); > + t2_1 = xfs_calc_inode_res(mp, 2) + > + xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), XFS_FSB_TO_B(mp, 1)); > + t2_2 = xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) + > + xfs_calc_buf_res(xfs_allocfree_block_count(mp, 1), > + XFS_FSB_TO_B(mp, 1)); > + t2 = max(t2_1, t2_2); Add xfs_calc_iunlink_remove_reservation to overhead, rename t2_1 to t1 and t2_2 to t2, and the return statement can become: return overhead + max3(t1, t2, t3); > + > + if (xfs_has_parent(mp)) { > + t3 = resp->tr_attrsetm.tr_logres; > + overhead += sizeof(struct xfs_attri_log_item) + > + xlog_calc_iovec_len(XATTR_NAME_MAX) + > + xlog_calc_iovec_len( > + sizeof(struct xfs_parent_name_rec)); overhead += xfs_calc_pptr_link_overhead(); > + } > + > + return overhead + t1 + t2 + t3; > } > > /* > @@ -497,6 +569,23 @@ xfs_calc_iunlink_add_reservation(xfs_mount_t *mp) > M_IGEO(mp)->inode_cluster_size; > } > > +static inline unsigned int > +xfs_remove_log_count( > + struct xfs_mount *mp, > + struct xfs_trans_resv *resp) > +{ > + unsigned int ret = XFS_REMOVE_LOG_COUNT; > + > + /* > + * Pre-reserve enough log reservation to handle the transaction > + * rolling needed to add one parent pointer. > + */ > + if (xfs_has_parent(mp)) > + ret += resp->tr_attrrm.tr_logcount; > + > + return ret; > +} > + > /* > * For removing a directory entry we can modify: > * the parent directory inode: inode size > @@ -513,14 +602,27 @@ STATIC uint > xfs_calc_remove_reservation( > struct xfs_mount *mp) > { > - return XFS_DQUOT_LOGRES(mp) + > - xfs_calc_iunlink_add_reservation(mp) + > - max((xfs_calc_inode_res(mp, 2) + > - xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), > - XFS_FSB_TO_B(mp, 1))), > - (xfs_calc_buf_res(4, mp->m_sb.sb_sectsize) + > - xfs_calc_buf_res(xfs_allocfree_block_count(mp, 2), > - XFS_FSB_TO_B(mp, 1)))); > + unsigned int overhead = XFS_DQUOT_LOGRES(mp); > + struct xfs_trans_resv *resp = M_RES(mp); > + unsigned int t1, t2, t2_1, t2_2, t3 = 0; > + > + t1 = xfs_calc_iunlink_add_reservation(mp); > + > + t2_1 = xfs_calc_inode_res(mp, 2) + > + xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), XFS_FSB_TO_B(mp, 1)); > + t2_2 = xfs_calc_buf_res(4, mp->m_sb.sb_sectsize) + > + xfs_calc_buf_res(xfs_allocfree_block_count(mp, 2), > + XFS_FSB_TO_B(mp, 1)); > + t2 = max(t2_1, t2_2); Similar to the last _reservation function -- add xfs_calc_iunlink_add_reservation to overhead, rename t2_1 to t1 and t2_2 to t2 and the return statement becomes: return overhead + max3(t1, t2, t3); > + if (xfs_has_parent(mp)) { > + t3 = resp->tr_attrrm.tr_logres; > + overhead += sizeof(struct xfs_attri_log_item) + > + xlog_calc_iovec_len( > + sizeof(struct xfs_parent_name_rec)); overhead += xfs_calc_pptr_unlink_overhead(); > + } > + > + return overhead + t1 + t2 + t3; > } > > /* > @@ -569,12 +671,39 @@ xfs_calc_icreate_resv_alloc( > xfs_calc_finobt_res(mp); > } > > +static inline unsigned int > +xfs_icreate_log_count( > + struct xfs_mount *mp, > + struct xfs_trans_resv *resp) > +{ > + unsigned int ret = XFS_CREATE_LOG_COUNT; > + > + /* > + * Pre-reserve enough log reservation to handle the transaction > + * rolling needed to add one parent pointer. > + */ > + if (xfs_has_parent(mp)) > + ret += resp->tr_attrsetm.tr_logcount; > + > + return ret; > +} > + > STATIC uint > -xfs_calc_icreate_reservation(xfs_mount_t *mp) > +xfs_calc_icreate_reservation( > + struct xfs_mount *mp) > { > - return XFS_DQUOT_LOGRES(mp) + > - max(xfs_calc_icreate_resv_alloc(mp), > - xfs_calc_create_resv_modify(mp)); > + struct xfs_trans_resv *resp = M_RES(mp); > + unsigned int ret = XFS_DQUOT_LOGRES(mp) + > + max(xfs_calc_icreate_resv_alloc(mp), > + xfs_calc_create_resv_modify(mp)); Stylistic complaint: Please follow the same format as the other _calc functions: unsigned int overhead = XFS_DQUOT_LOGRES(mp); unsigned int t1, t2, t3 = 0; t1 = xfs_calc_icreate_resv_alloc(mp); t2 = xfs_calc_create_resv_modify(mp); if (xfs_has_parent(mp)) { t3 = resp->tr_attrsetm.tr_logres; overhead += xfs_calc_pptr_link_overhead(); } return overhead + max3(t1, t2, t3); > + > + if (xfs_has_parent(mp)) > + ret += resp->tr_attrsetm.tr_logres + > + sizeof(struct xfs_attri_log_item) + > + xlog_calc_iovec_len(XATTR_NAME_MAX) + > + xlog_calc_iovec_len( > + sizeof(struct xfs_parent_name_rec)); > + return ret; > } > > STATIC uint > @@ -587,6 +716,23 @@ xfs_calc_create_tmpfile_reservation( > return res + xfs_calc_iunlink_add_reservation(mp); > } > > +static inline unsigned int > +xfs_mkdir_log_count( > + struct xfs_mount *mp, > + struct xfs_trans_resv *resp) > +{ > + unsigned int ret = XFS_MKDIR_LOG_COUNT; > + > + /* > + * Pre-reserve enough log reservation to handle the transaction > + * rolling needed to add one parent pointer. > + */ > + if (xfs_has_parent(mp)) > + ret += resp->tr_attrsetm.tr_logcount; > + > + return ret; > +} > + > /* > * Making a new directory is the same as creating a new file. > */ > @@ -597,6 +743,22 @@ xfs_calc_mkdir_reservation( > return xfs_calc_icreate_reservation(mp); > } > > +static inline unsigned int > +xfs_symlink_log_count( > + struct xfs_mount *mp, > + struct xfs_trans_resv *resp) > +{ > + unsigned int ret = XFS_SYMLINK_LOG_COUNT; > + > + /* > + * Pre-reserve enough log reservation to handle the transaction > + * rolling needed to add one parent pointer. > + */ > + if (xfs_has_parent(mp)) > + ret += resp->tr_attrsetm.tr_logcount; > + > + return ret; > +} > > /* > * Making a new symplink is the same as creating a new file, but > @@ -607,8 +769,17 @@ STATIC uint > xfs_calc_symlink_reservation( > struct xfs_mount *mp) > { > - return xfs_calc_icreate_reservation(mp) + > - xfs_calc_buf_res(1, XFS_SYMLINK_MAXLEN); > + struct xfs_trans_resv *resp = M_RES(mp); > + unsigned int ret = xfs_calc_icreate_reservation(mp) + > + xfs_calc_buf_res(1, XFS_SYMLINK_MAXLEN); > + > + if (xfs_has_parent(mp)) > + ret += resp->tr_attrsetm.tr_logres + > + sizeof(struct xfs_attri_log_item) + > + xlog_calc_iovec_len(XATTR_NAME_MAX) + > + xlog_calc_iovec_len( > + sizeof(struct xfs_parent_name_rec)); Didn't we already account for the pptr log item overhead in xfs_calc_icreate_reservation? > + return ret; > } > > /* > @@ -909,54 +1080,76 @@ xfs_calc_sb_reservation( > return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); > } > > -void > -xfs_trans_resv_calc( > +/* > + * Namespace reservations. > + * > + * These get tricky when parent pointers are enabled as we have attribute > + * modifications occurring from within these transactions. Rather than confuse > + * each of these reservation calculations with the conditional attribute > + * reservations, add them here in a clear and concise manner. This assumes that s/assumes/requires/ since you put in ASSERTs :) --D > + * the attribute reservations have already been calculated. > + * > + * Note that we only include the static attribute reservation here; the runtime > + * reservation will have to be modified by the size of the attributes being > + * added/removed/modified. See the comments on the attribute reservation > + * calculations for more details. > + */ > +STATIC void > +xfs_calc_namespace_reservations( > struct xfs_mount *mp, > struct xfs_trans_resv *resp) > { > - int logcount_adj = 0; > - > - /* > - * The following transactions are logged in physical format and > - * require a permanent reservation on space. > - */ > - resp->tr_write.tr_logres = xfs_calc_write_reservation(mp, false); > - resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT; > - resp->tr_write.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > - > - resp->tr_itruncate.tr_logres = xfs_calc_itruncate_reservation(mp, false); > - resp->tr_itruncate.tr_logcount = XFS_ITRUNCATE_LOG_COUNT; > - resp->tr_itruncate.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > + ASSERT(resp->tr_attrsetm.tr_logres > 0); > > resp->tr_rename.tr_logres = xfs_calc_rename_reservation(mp); > - resp->tr_rename.tr_logcount = XFS_RENAME_LOG_COUNT; > + resp->tr_rename.tr_logcount = xfs_rename_log_count(mp, resp); > resp->tr_rename.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > > resp->tr_link.tr_logres = xfs_calc_link_reservation(mp); > - resp->tr_link.tr_logcount = XFS_LINK_LOG_COUNT; > + resp->tr_link.tr_logcount = xfs_link_log_count(mp, resp); > resp->tr_link.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > > resp->tr_remove.tr_logres = xfs_calc_remove_reservation(mp); > - resp->tr_remove.tr_logcount = XFS_REMOVE_LOG_COUNT; > + resp->tr_remove.tr_logcount = xfs_remove_log_count(mp, resp); > resp->tr_remove.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > > resp->tr_symlink.tr_logres = xfs_calc_symlink_reservation(mp); > - resp->tr_symlink.tr_logcount = XFS_SYMLINK_LOG_COUNT; > + resp->tr_symlink.tr_logcount = xfs_symlink_log_count(mp, resp); > resp->tr_symlink.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > > resp->tr_create.tr_logres = xfs_calc_icreate_reservation(mp); > - resp->tr_create.tr_logcount = XFS_CREATE_LOG_COUNT; > + resp->tr_create.tr_logcount = xfs_icreate_log_count(mp, resp); > resp->tr_create.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > > + resp->tr_mkdir.tr_logres = xfs_calc_mkdir_reservation(mp); > + resp->tr_mkdir.tr_logcount = xfs_mkdir_log_count(mp, resp); > + resp->tr_mkdir.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > +} > + > +void > +xfs_trans_resv_calc( > + struct xfs_mount *mp, > + struct xfs_trans_resv *resp) > +{ > + int logcount_adj = 0; > + > + /* > + * The following transactions are logged in physical format and > + * require a permanent reservation on space. > + */ > + resp->tr_write.tr_logres = xfs_calc_write_reservation(mp, false); > + resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT; > + resp->tr_write.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > + > + resp->tr_itruncate.tr_logres = xfs_calc_itruncate_reservation(mp, false); > + resp->tr_itruncate.tr_logcount = XFS_ITRUNCATE_LOG_COUNT; > + resp->tr_itruncate.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > + > resp->tr_create_tmpfile.tr_logres = > xfs_calc_create_tmpfile_reservation(mp); > resp->tr_create_tmpfile.tr_logcount = XFS_CREATE_TMPFILE_LOG_COUNT; > resp->tr_create_tmpfile.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > > - resp->tr_mkdir.tr_logres = xfs_calc_mkdir_reservation(mp); > - resp->tr_mkdir.tr_logcount = XFS_MKDIR_LOG_COUNT; > - resp->tr_mkdir.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > - > resp->tr_ifree.tr_logres = xfs_calc_ifree_reservation(mp); > resp->tr_ifree.tr_logcount = XFS_INACTIVE_LOG_COUNT; > resp->tr_ifree.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > @@ -986,6 +1179,8 @@ xfs_trans_resv_calc( > resp->tr_qm_dqalloc.tr_logcount = XFS_WRITE_LOG_COUNT; > resp->tr_qm_dqalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES; > > + xfs_calc_namespace_reservations(mp, resp); > + > /* > * The following transactions are logged in logical format with > * a default log count. > -- > 2.25.1 >