From 6bac243f0793499782267342eba852a8a6cc7ac4 Mon Sep 17 00:00:00 2001 From: Steven Whitehouse Date: Mon, 9 Mar 2009 09:03:51 +0000 Subject: GFS2: Clean up of glops.c This cleans up a number of bits of code mostly based in glops.c. A couple of simple functions have been merged into the callers to make it more obvious what is going on, the mysterious raising of i_writecount around the truncate_inode_pages() call has been removed. The meta_go_* operations have been renamed rgrp_go_* since that is the only lock type that they are used with. The unused argument of gfs2_read_sb has been removed. Also a bug has been fixed where a check for the rindex inode was in the wrong callback. More comments are added, and the debugging code is improved too. Signed-off-by: Steven Whitehouse --- fs/gfs2/glops.c | 115 +++++++++++++++++++++++++------------------------------- 1 file changed, 52 insertions(+), 63 deletions(-) (limited to 'fs/gfs2/glops.c') diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c index f34bc7093dd1..bf23a62aa925 100644 --- a/fs/gfs2/glops.c +++ b/fs/gfs2/glops.c @@ -76,29 +76,7 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl) } /** - * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock - * @gl: the glock - * - */ - -static void gfs2_pte_inval(struct gfs2_glock *gl) -{ - struct gfs2_inode *ip; - struct inode *inode; - - ip = gl->gl_object; - inode = &ip->i_inode; - if (!ip || !S_ISREG(inode->i_mode)) - return; - - unmap_shared_mapping_range(inode->i_mapping, 0, 0); - if (test_bit(GIF_SW_PAGED, &ip->i_flags)) - set_bit(GLF_DIRTY, &gl->gl_flags); - -} - -/** - * meta_go_sync - sync out the metadata for this glock + * rgrp_go_sync - sync out the metadata for this glock * @gl: the glock * * Called when demoting or unlocking an EX glock. We must flush @@ -106,36 +84,42 @@ static void gfs2_pte_inval(struct gfs2_glock *gl) * not return to caller to demote/unlock the glock until I/O is complete. */ -static void meta_go_sync(struct gfs2_glock *gl) +static void rgrp_go_sync(struct gfs2_glock *gl) { - if (gl->gl_state != LM_ST_EXCLUSIVE) + struct address_space *metamapping = gl->gl_aspace->i_mapping; + int error; + + if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) return; + BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE); - if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) { - gfs2_log_flush(gl->gl_sbd, gl); - gfs2_meta_sync(gl); - gfs2_ail_empty_gl(gl); - } + gfs2_log_flush(gl->gl_sbd, gl); + filemap_fdatawrite(metamapping); + error = filemap_fdatawait(metamapping); + mapping_set_error(metamapping, error); + gfs2_ail_empty_gl(gl); } /** - * meta_go_inval - invalidate the metadata for this glock + * rgrp_go_inval - invalidate the metadata for this glock * @gl: the glock * @flags: * + * We never used LM_ST_DEFERRED with resource groups, so that we + * should always see the metadata flag set here. + * */ -static void meta_go_inval(struct gfs2_glock *gl, int flags) +static void rgrp_go_inval(struct gfs2_glock *gl, int flags) { - if (!(flags & DIO_METADATA)) - return; + struct address_space *mapping = gl->gl_aspace->i_mapping; - gfs2_meta_inval(gl); - if (gl->gl_object == GFS2_I(gl->gl_sbd->sd_rindex)) - gl->gl_sbd->sd_rindex_uptodate = 0; - else if (gl->gl_ops == &gfs2_rgrp_glops && gl->gl_object) { - struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object; + BUG_ON(!(flags & DIO_METADATA)); + gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count)); + truncate_inode_pages(mapping, 0); + if (gl->gl_object) { + struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object; rgd->rd_flags &= ~GFS2_RDF_UPTODATE; } } @@ -152,48 +136,54 @@ static void inode_go_sync(struct gfs2_glock *gl) struct address_space *metamapping = gl->gl_aspace->i_mapping; int error; - if (gl->gl_state != LM_ST_UNLOCKED) - gfs2_pte_inval(gl); - if (gl->gl_state != LM_ST_EXCLUSIVE) - return; - if (ip && !S_ISREG(ip->i_inode.i_mode)) ip = NULL; + if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags)) + unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0); + if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) + return; - if (test_bit(GLF_DIRTY, &gl->gl_flags)) { - gfs2_log_flush(gl->gl_sbd, gl); - filemap_fdatawrite(metamapping); - if (ip) { - struct address_space *mapping = ip->i_inode.i_mapping; - filemap_fdatawrite(mapping); - error = filemap_fdatawait(mapping); - mapping_set_error(mapping, error); - } - error = filemap_fdatawait(metamapping); - mapping_set_error(metamapping, error); - clear_bit(GLF_DIRTY, &gl->gl_flags); - gfs2_ail_empty_gl(gl); + BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE); + + gfs2_log_flush(gl->gl_sbd, gl); + filemap_fdatawrite(metamapping); + if (ip) { + struct address_space *mapping = ip->i_inode.i_mapping; + filemap_fdatawrite(mapping); + error = filemap_fdatawait(mapping); + mapping_set_error(mapping, error); } + error = filemap_fdatawait(metamapping); + mapping_set_error(metamapping, error); + gfs2_ail_empty_gl(gl); } /** * inode_go_inval - prepare a inode glock to be released * @gl: the glock * @flags: + * + * Normally we invlidate everything, but if we are moving into + * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we + * can keep hold of the metadata, since it won't have changed. * */ static void inode_go_inval(struct gfs2_glock *gl, int flags) { struct gfs2_inode *ip = gl->gl_object; - int meta = (flags & DIO_METADATA); - if (meta) { - gfs2_meta_inval(gl); + gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count)); + + if (flags & DIO_METADATA) { + struct address_space *mapping = gl->gl_aspace->i_mapping; + truncate_inode_pages(mapping, 0); if (ip) set_bit(GIF_INVALID, &ip->i_flags); } + if (ip == GFS2_I(gl->gl_sbd->sd_rindex)) + gl->gl_sbd->sd_rindex_uptodate = 0; if (ip && S_ISREG(ip->i_inode.i_mode)) truncate_inode_pages(ip->i_inode.i_mapping, 0); } @@ -395,7 +385,6 @@ static int trans_go_demote_ok(const struct gfs2_glock *gl) } const struct gfs2_glock_operations gfs2_meta_glops = { - .go_xmote_th = meta_go_sync, .go_type = LM_TYPE_META, }; @@ -410,8 +399,8 @@ const struct gfs2_glock_operations gfs2_inode_glops = { }; const struct gfs2_glock_operations gfs2_rgrp_glops = { - .go_xmote_th = meta_go_sync, - .go_inval = meta_go_inval, + .go_xmote_th = rgrp_go_sync, + .go_inval = rgrp_go_inval, .go_demote_ok = rgrp_go_demote_ok, .go_lock = rgrp_go_lock, .go_unlock = rgrp_go_unlock, -- cgit v1.2.2