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GET /api/patches/2216327/?format=api
{ "id": 2216327, "url": "http://patchwork.ozlabs.org/api/patches/2216327/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260326095354.16340-73-jack@suse.cz/", "project": { "id": 8, "url": "http://patchwork.ozlabs.org/api/projects/8/?format=api", "name": "Linux ext4 filesystem development", "link_name": "linux-ext4", "list_id": "linux-ext4.vger.kernel.org", "list_email": "linux-ext4@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260326095354.16340-73-jack@suse.cz>", "list_archive_url": null, "date": "2026-03-26T09:54:25", "name": "[31/42] fs: Make bhs point to mapping_metadata_bhs", "commit_ref": null, "pull_url": null, "state": "not-applicable", "archived": false, "hash": "e4feef5daf1191ff73ed1f509eae4b76d97d3d9a", "submitter": { "id": 363, "url": "http://patchwork.ozlabs.org/api/people/363/?format=api", "name": "Jan Kara", "email": "jack@suse.cz" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260326095354.16340-73-jack@suse.cz/mbox/", "series": [ { "id": 497561, "url": "http://patchwork.ozlabs.org/api/series/497561/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=497561", "date": "2026-03-26T09:53:55", "name": "fs: Move metadata bh tracking from address_space", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/497561/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2216327/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216327/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=+wfV=B2=vger.kernel.org=linux-ext4+bounces-15425-patchwork-incoming=ozlabs.org@ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-ext4@vger.kernel.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "patchwork-incoming@ozlabs.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=suse.cz header.i=@suse.cz header.a=rsa-sha256\n header.s=susede2_rsa header.b=OADSHKW5;\n\tdkim=pass header.d=suse.cz header.i=@suse.cz header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=l16TjtdG;\n\tdkim=pass (1024-bit key) header.d=suse.cz header.i=@suse.cz\n header.a=rsa-sha256 header.s=susede2_rsa header.b=OADSHKW5;\n\tdkim=neutral header.d=suse.cz header.i=@suse.cz header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=l16TjtdG;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz;\n\ts=susede2_ed25519; t=1774518901;\n\th=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n\t mime-version:mime-version:\n\t content-transfer-encoding:content-transfer-encoding:\n\t in-reply-to:in-reply-to:references:references;\n\tbh=IHiAer5S6vrbYMpKx0xYeQ/j67Qu5LHB+GVrhSFoFt4=;\n\tb=l16TjtdGw+T0j7IUL5SgycSjYmBmMJOYKp4v0ARxHd0DWjR1MbP9QQjac3O2LVHKdG+Gl0\n\t2JON3bIbrlqOl5Aw==", "v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz;\n s=susede2_rsa;\n\tt=1774518901;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n\t mime-version:mime-version:\n\t content-transfer-encoding:content-transfer-encoding:\n\t in-reply-to:in-reply-to:references:references;\n\tbh=IHiAer5S6vrbYMpKx0xYeQ/j67Qu5LHB+GVrhSFoFt4=;\n\tb=OADSHKW5/LfJD4Vr9FPQoAJQ+WdhB8yoqRcj7UoiGQGQ1j9OG8ww9OlzmGjCQsDXjqlsUb\n\t+/NjkG+EpKVG5bZDa09w5AJ5LEbBsZYKE9BFYzpom8e3My7kxx8zhH91mPcXeIlaa/yw7B\n\t8jPQP7g9nyvpOIxPWb/CoVH1iFTrkm4=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz;\n\ts=susede2_ed25519; t=1774518901;\n\th=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n\t mime-version:mime-version:\n\t content-transfer-encoding:content-transfer-encoding:\n\t in-reply-to:in-reply-to:references:references;\n\tbh=IHiAer5S6vrbYMpKx0xYeQ/j67Qu5LHB+GVrhSFoFt4=;\n\tb=l16TjtdGw+T0j7IUL5SgycSjYmBmMJOYKp4v0ARxHd0DWjR1MbP9QQjac3O2LVHKdG+Gl0\n\t2JON3bIbrlqOl5Aw==" ], "From": "Jan Kara <jack@suse.cz>", "To": "<linux-fsdevel@vger.kernel.org>", "Cc": "<linux-block@vger.kernel.org>,\n\tChristian Brauner <brauner@kernel.org>,\n\tAl Viro <viro@ZenIV.linux.org.uk>,\n\t<linux-ext4@vger.kernel.org>,\n\tTed Tso <tytso@mit.edu>,\n\t\"Tigran A. Aivazian\" <aivazian.tigran@gmail.com>,\n\tDavid Sterba <dsterba@suse.com>,\n\tOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,\n\tMuchun Song <muchun.song@linux.dev>,\n\tOscar Salvador <osalvador@suse.de>,\n\tDavid Hildenbrand <david@kernel.org>,\n\tlinux-mm@kvack.org,\n\tlinux-aio@kvack.org,\n\tBenjamin LaHaise <bcrl@kvack.org>,\n\tJan Kara <jack@suse.cz>,\n\tChristoph Hellwig <hch@lst.de>", "Subject": "[PATCH 31/42] fs: Make bhs point to mapping_metadata_bhs", "Date": "Thu, 26 Mar 2026 10:54:25 +0100", "Message-ID": "<20260326095354.16340-73-jack@suse.cz>", "X-Mailer": "git-send-email 2.51.0", "In-Reply-To": "<20260326082428.31660-1-jack@suse.cz>", "References": "<20260326082428.31660-1-jack@suse.cz>", "Precedence": "bulk", "X-Mailing-List": "linux-ext4@vger.kernel.org", "List-Id": "<linux-ext4.vger.kernel.org>", "List-Subscribe": "<mailto:linux-ext4+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-ext4+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "X-Developer-Signature": "v=1; a=openpgp-sha256; l=5968; i=jack@suse.cz;\n h=from:subject; bh=Nvg4SCHyCit7oFGSW4/ka9vNUJnfInqRbSSrUnWjLQw=;\n b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBpxQJMh1XYdCxYppUDWbSf/NfZsEg51iPLas0o9\n xJVAHKXQN6JATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCacUCTAAKCRCcnaoHP2RA\n 2XOJB/0TLlZpSrZiy6tJf3KvPLed0uJyzwfcoBXKkIVZddDE4RePitBsmW7X5SEiC5vVYvl/qV4\n IE2s0vJl3T9zsvIt7pG26kOYBWAgXSRUv6rziD3HD9Py1wU7eLNdtEzxRVjWXdD1vusRcAqojjf\n P7kbyEFmQjSBmN5e6ISTFXXfXepiz2b4lTvpiwPvWbYHmtjvptn5F6w5HGwP7U5bPnj/gIFh3aD\n Od2wEEYD8V5Dt76/47r0MkJEWSRvhH7qLDPaZRrGfL64d631FIhAQJoBWYxM+mLQ3Vb/C86GTjx\n gFe/hYnjtXjg0GKMNtOBCQCWri9ZjTfFUAwp+GxGQReadbpd", "X-Developer-Key": "i=jack@suse.cz; a=openpgp;\n fpr=93C6099A142276A28BBE35D815BC833443038D8C", "Content-Transfer-Encoding": "8bit", "X-Spamd-Result": "default: False [-1.51 / 50.00];\n\tBAYES_HAM(-3.00)[100.00%];\n\tSUSPICIOUS_RECIPS(1.50)[];\n\tMID_CONTAINS_FROM(1.00)[];\n\tNEURAL_HAM_LONG(-1.00)[-1.000];\n\tR_MISSING_CHARSET(0.50)[];\n\tR_DKIM_ALLOW(-0.20)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519];\n\tNEURAL_HAM_SHORT(-0.20)[-1.000];\n\tMIME_GOOD(-0.10)[text/plain];\n\tMX_GOOD(-0.01)[];\n\tRCVD_COUNT_THREE(0.00)[3];\n\tDKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519];\n\tFUZZY_RATELIMITED(0.00)[rspamd.com];\n\tRBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from];\n\tSPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from];\n\tARC_NA(0.00)[];\n\tRCPT_COUNT_TWELVE(0.00)[17];\n\tMIME_TRACE(0.00)[0:+];\n\tDBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns];\n\tRCVD_TLS_LAST(0.00)[];\n\tFROM_HAS_DN(0.00)[];\n\tRCVD_VIA_SMTP_AUTH(0.00)[];\n\tTAGGED_RCPT(0.00)[];\n\tRECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received];\n\tTO_MATCH_ENVRCPT_ALL(0.00)[];\n\tR_RATELIMIT(0.00)[to_ip_from(RLhafujjw6m7bafrsz8p45s31g),to(RLpnp1psq57oqao6ocwdpbxen9)];\n\tFREEMAIL_CC(0.00)[vger.kernel.org,kernel.org,ZenIV.linux.org.uk,mit.edu,gmail.com,suse.com,mail.parknet.co.jp,linux.dev,suse.de,kvack.org,suse.cz,lst.de];\n\tDKIM_TRACE(0.00)[suse.cz:+];\n\tTO_DN_SOME(0.00)[];\n\tFROM_EQ_ENVFROM(0.00)[];\n\tFREEMAIL_ENVRCPT(0.00)[gmail.com]", "X-Rspamd-Action": "no action", "X-Spam-Score": "-1.51", "X-Spam-Level": "", "X-Rspamd-Server": "rspamd1.dmz-prg2.suse.org", "X-Rspamd-Queue-Id": "8E45F4D295", "X-Spam-Status": "No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_MISSING,\n\tHEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,\n\tSPF_PASS autolearn=disabled version=4.0.1", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org" }, "content": "Make buffer heads point to mapping_metadata_bhs instead of struct\naddress_space. This makes the code more self contained. For the (only)\ncase of IO error handling where we really need to reach struct\naddress_space add a pointer to the mapping from mapping_metadata_bhs.\n\nReviewed-by: Christoph Hellwig <hch@lst.de>\nSigned-off-by: Jan Kara <jack@suse.cz>\n---\n fs/buffer.c | 34 ++++++++++++++++------------------\n fs/inode.c | 1 +\n include/linux/buffer_head.h | 4 ++--\n include/linux/fs.h | 1 +\n 4 files changed, 20 insertions(+), 20 deletions(-)", "diff": "diff --git a/fs/buffer.c b/fs/buffer.c\nindex 294f9cd07f42..67b3d4624503 100644\n--- a/fs/buffer.c\n+++ b/fs/buffer.c\n@@ -497,13 +497,12 @@ static void __remove_assoc_queue(struct mapping_metadata_bhs *mmb,\n {\n \tlockdep_assert_held(&mmb->lock);\n \tlist_del_init(&bh->b_assoc_buffers);\n-\tWARN_ON(!bh->b_assoc_map);\n-\tbh->b_assoc_map = NULL;\n+\tWARN_ON(!bh->b_mmb);\n+\tbh->b_mmb = NULL;\n }\n \n static void remove_assoc_queue(struct buffer_head *bh)\n {\n-\tstruct address_space *mapping;\n \tstruct mapping_metadata_bhs *mmb;\n \n \t/*\n@@ -514,13 +513,12 @@ static void remove_assoc_queue(struct buffer_head *bh)\n \t * opportunistically acquire the lock and then recheck the bh\n \t * didn't move under us.\n \t */\n-\twhile (bh->b_assoc_map) {\n+\twhile (bh->b_mmb) {\n \t\trcu_read_lock();\n-\t\tmapping = READ_ONCE(bh->b_assoc_map);\n-\t\tif (mapping) {\n-\t\t\tmmb = &mapping->i_metadata_bhs;\n+\t\tmmb = READ_ONCE(bh->b_mmb);\n+\t\tif (mmb) {\n \t\t\tspin_lock(&mmb->lock);\n-\t\t\tif (bh->b_assoc_map == mapping)\n+\t\t\tif (bh->b_mmb == mmb)\n \t\t\t\t__remove_assoc_queue(mmb, bh);\n \t\t\tspin_unlock(&mmb->lock);\n \t\t}\n@@ -551,9 +549,9 @@ EXPORT_SYMBOL_GPL(inode_has_buffers);\n * Do this in two main stages: first we copy dirty buffers to a\n * temporary inode list, queueing the writes as we go. Then we clean\n * up, waiting for those writes to complete. mark_buffer_dirty_inode()\n- * doesn't touch b_assoc_buffers list if b_assoc_map is not NULL so we\n- * are sure the buffer stays on our list until IO completes (at which point\n- * it can be reaped).\n+ * doesn't touch b_assoc_buffers list if b_mmb is not NULL so we are sure the\n+ * buffer stays on our list until IO completes (at which point it can be\n+ * reaped).\n */\n int sync_mapping_buffers(struct address_space *mapping)\n {\n@@ -571,14 +569,14 @@ int sync_mapping_buffers(struct address_space *mapping)\n \tspin_lock(&mmb->lock);\n \twhile (!list_empty(&mmb->list)) {\n \t\tbh = BH_ENTRY(mmb->list.next);\n-\t\tWARN_ON_ONCE(bh->b_assoc_map != mapping);\n+\t\tWARN_ON_ONCE(bh->b_mmb != mmb);\n \t\t__remove_assoc_queue(mmb, bh);\n \t\t/* Avoid race with mark_buffer_dirty_inode() which does\n \t\t * a lockless check and we rely on seeing the dirty bit */\n \t\tsmp_mb();\n \t\tif (buffer_dirty(bh) || buffer_locked(bh)) {\n \t\t\tlist_add(&bh->b_assoc_buffers, &tmp);\n-\t\t\tbh->b_assoc_map = mapping;\n+\t\t\tbh->b_mmb = mmb;\n \t\t\tif (buffer_dirty(bh)) {\n \t\t\t\tget_bh(bh);\n \t\t\t\tspin_unlock(&mmb->lock);\n@@ -616,7 +614,7 @@ int sync_mapping_buffers(struct address_space *mapping)\n \t\tsmp_mb();\n \t\tif (buffer_dirty(bh)) {\n \t\t\tlist_add(&bh->b_assoc_buffers, &mmb->list);\n-\t\t\tbh->b_assoc_map = mapping;\n+\t\t\tbh->b_mmb = mmb;\n \t\t}\n \t\tspin_unlock(&mmb->lock);\n \t\twait_on_buffer(bh);\n@@ -724,11 +722,11 @@ void mark_buffer_dirty_inode(struct buffer_head *bh, struct inode *inode)\n \tstruct address_space *mapping = inode->i_mapping;\n \n \tmark_buffer_dirty(bh);\n-\tif (!bh->b_assoc_map) {\n+\tif (!bh->b_mmb) {\n \t\tspin_lock(&mapping->i_metadata_bhs.lock);\n \t\tlist_move_tail(&bh->b_assoc_buffers,\n \t\t\t\t&mapping->i_metadata_bhs.list);\n-\t\tbh->b_assoc_map = mapping;\n+\t\tbh->b_mmb = &mapping->i_metadata_bhs;\n \t\tspin_unlock(&mapping->i_metadata_bhs.lock);\n \t}\n }\n@@ -1124,8 +1122,8 @@ void mark_buffer_write_io_error(struct buffer_head *bh)\n \t/* FIXME: do we need to set this in both places? */\n \tif (bh->b_folio && bh->b_folio->mapping)\n \t\tmapping_set_error(bh->b_folio->mapping, -EIO);\n-\tif (bh->b_assoc_map)\n-\t\tmapping_set_error(bh->b_assoc_map, -EIO);\n+\tif (bh->b_mmb)\n+\t\tmapping_set_error(bh->b_mmb->mapping, -EIO);\n }\n EXPORT_SYMBOL(mark_buffer_write_io_error);\n \ndiff --git a/fs/inode.c b/fs/inode.c\nindex 393f586d050a..3874b933abdb 100644\n--- a/fs/inode.c\n+++ b/fs/inode.c\n@@ -276,6 +276,7 @@ int inode_init_always_gfp(struct super_block *sb, struct inode *inode, gfp_t gfp\n \n \tmapping->a_ops = &empty_aops;\n \tmapping->host = inode;\n+\tmapping->i_metadata_bhs.mapping = mapping;\n \tmapping->flags = 0;\n \tmapping->wb_err = 0;\n \tatomic_set(&mapping->i_mmap_writable, 0);\ndiff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h\nindex 631bf971efc0..20636599d858 100644\n--- a/include/linux/buffer_head.h\n+++ b/include/linux/buffer_head.h\n@@ -73,8 +73,8 @@ struct buffer_head {\n \tbh_end_io_t *b_end_io;\t\t/* I/O completion */\n \tvoid *b_private;\t\t/* reserved for b_end_io */\n \tstruct list_head b_assoc_buffers; /* associated with another mapping */\n-\tstruct address_space *b_assoc_map;\t/* mapping this buffer is\n-\t\t\t\t\t\t associated with */\n+\tstruct mapping_metadata_bhs *b_mmb; /* head of the list of metadata bhs\n+\t\t\t\t\t * this buffer is associated with */\n \tatomic_t b_count;\t\t/* users using this buffer_head */\n \tspinlock_t b_uptodate_lock;\t/* Used by the first bh in a page, to\n \t\t\t\t\t * serialise IO completion of other\ndiff --git a/include/linux/fs.h b/include/linux/fs.h\nindex 76360b0040e0..fa2a812bd718 100644\n--- a/include/linux/fs.h\n+++ b/include/linux/fs.h\n@@ -447,6 +447,7 @@ extern const struct address_space_operations empty_aops;\n \n /* Structure for tracking metadata buffer heads associated with the mapping */\n struct mapping_metadata_bhs {\n+\tstruct address_space *mapping;\t/* Mapping bhs are associated with */\n \tspinlock_t lock;\t/* Lock protecting bh list */\n \tstruct list_head list;\t/* The list of bhs (b_assoc_buffers) */\n };\n", "prefixes": [ "31/42" ] }