AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/06/28 05:33 flow patch-triage
0m Args: 
null

Results: 
{
  "EnableConfigs": [
    "MINIX_FS"
  ],
  "FocusSymbols": [
    "minix_dio_read_iter",
    "minix_dio_write_iter",
    "minix_dio_write_end_io",
    "minix_file_read_iter",
    "minix_file_write_iter",
    "minix_iomap_begin",
    "minix_iomap_end",
    "V1_minix_iomap_begin",
    "V2_minix_iomap_begin",
    "minix_writeback_range",
    "minix_writepages",
    "minix_read_folio",
    "minix_readahead",
    "minix_bmap",
    "__page_symlink",
    "minix_get_link",
    "minix_free_link"
  ],
  "Reasoning": "The patch implements iomap-based direct I/O and buffered I/O for the minix filesystem, which is a functional change to the core filesystem logic. It modifies read/write paths, block mapping, and symlink handling.",
  "WorthFuzzing": true
}
1/1 2026/06/28 05:33 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit a44eef86fda4b737576c283ad05e48d91bbb21a5\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sun Jun 28 05:33:02 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/fs/minix/file.c b/fs/minix/file.c\nindex 86e5943cd2ff74..b07c853fa43abc 100644\n--- a/fs/minix/file.c\n+++ b/fs/minix/file.c\n@@ -17,21 +17,166 @@ int minix_fsync(struct file *file, loff_t start, loff_t end, int datasync)\n \t\t\tstart, end, datasync);\n }\n \n+static ssize_t minix_dio_read_iter(struct kiocb *iocb, struct iov_iter *to)\n+{\n+\tstruct inode *inode = iocb-\u003eki_filp-\u003ef_mapping-\u003ehost;\n+\tssize_t ret;\n+\n+\tinode_lock_shared(inode);\n+\n+\tconst struct iomap_ops *ops = minix_iomap_ops_ver(inode);\n+\n+\tret = iomap_dio_rw(iocb, to, ops, NULL, 0, NULL, 0);\n+\tinode_unlock_shared(inode);\n+\treturn ret;\n+}\n+\n+static int minix_dio_write_end_io(struct kiocb *iocb, ssize_t size, int error,\n+\t\tunsigned int flags)\n+{\n+\tstruct inode *inode = file_inode(iocb-\u003eki_filp);\n+\tloff_t pos = iocb-\u003eki_pos;\n+\n+\tif (error)\n+\t\treturn error;\n+\n+\tpos += size;\n+\tif (size \u0026\u0026 pos \u003e i_size_read(inode)) {\n+\t\ti_size_write(inode, pos);\n+\t\tmark_inode_dirty(inode);\n+\t}\n+\treturn 0;\n+}\n+\n+static const struct iomap_dio_ops minix_dio_write_ops = {\n+\t.end_io = minix_dio_write_end_io,\n+};\n+\n+static ssize_t minix_dio_write_iter(struct kiocb *iocb, struct iov_iter *from)\n+{\n+\tstruct inode *inode = iocb-\u003eki_filp-\u003ef_mapping-\u003ehost;\n+\tssize_t ret;\n+\tunsigned int flags = 0;\n+\tunsigned long blocksize = inode-\u003ei_sb-\u003es_blocksize;\n+\n+\tinode_lock(inode);\n+\tret = generic_write_checks(iocb, from);\n+\tif (ret \u003c= 0)\n+\t\tgoto out_unlock;\n+\n+\tret = kiocb_modified(iocb);\n+\tif (ret)\n+\t\tgoto out_unlock;\n+\n+\tif (iocb-\u003eki_pos + iov_iter_count(from) \u003e i_size_read(inode) ||\n+\t\t!IS_ALIGNED(iocb-\u003eki_pos | iov_iter_alignment(from), blocksize))\n+\t\tflags |= IOMAP_DIO_FORCE_WAIT;\n+\n+\tconst struct iomap_ops *ops = minix_iomap_ops_ver(inode);\n+\n+\tret = iomap_dio_rw(iocb, from, ops,\n+\t\t\u0026minix_dio_write_ops, flags, NULL, 0);\n+\tif (ret == -ENOTBLK)\n+\t\tret = 0; /* fallback to buffered */\n+\n+\tif (ret \u003e= 0 \u0026\u0026 iov_iter_count(from)) {\n+\t\tloff_t pos;\n+\t\tloff_t endbyte;\n+\t\tssize_t status;\n+\n+\t\tiocb-\u003eki_flags \u0026= ~IOCB_DIRECT;\n+\t\tpos = iocb-\u003eki_pos;\n+\t\tstatus = iomap_file_buffered_write(iocb, from, ops,\n+\t\t\tNULL, NULL);\n+\t\tif (unlikely(status \u003c 0)) {\n+\t\t\tret = status;\n+\t\t\tgoto out_unlock;\n+\t\t}\n+\n+\t\tret += status;\n+\t\tendbyte = pos + status - 1;\n+\t\tstatus = filemap_write_and_wait_range(inode-\u003ei_mapping, pos, endbyte);\n+\t\tif (!status) {\n+\t\t\tinvalidate_mapping_pages(inode-\u003ei_mapping,\n+\t\t\t\tpos \u003e\u003e PAGE_SHIFT,\n+\t\t\t\tendbyte \u003e\u003e PAGE_SHIFT);\n+\t\t\tif (ret \u003e 0)\n+\t\t\t\tret = generic_write_sync(iocb, ret);\n+\t\t} else {\n+\t\t\tret = status;\n+\t\t}\n+\t}\n+\n+out_unlock:\n+\tinode_unlock(inode);\n+\treturn ret;\n+}\n+\n+static ssize_t minix_file_read_iter(struct kiocb *iocb, struct iov_iter *to)\n+{\n+\tif (iocb-\u003eki_flags \u0026 IOCB_DIRECT)\n+\t\treturn minix_dio_read_iter(iocb, to);\n+\n+\treturn generic_file_read_iter(iocb, to);\n+}\n+\n+static ssize_t minix_file_write_iter(struct kiocb *iocb, struct iov_iter *from)\n+{\n+\tstruct inode *inode = iocb-\u003eki_filp-\u003ef_mapping-\u003ehost;\n+\tssize_t ret;\n+\n+\t/* minix_dio_write_iter also locks the inode and appears to do the same\n+\t * general sorts of checks as this, so just return directly from there.\n+\t */\n+\tif (iocb-\u003eki_flags \u0026 IOCB_DIRECT)\n+\t\treturn minix_dio_write_iter(iocb, from);\n+\n+\tinode_lock(inode);\n+\tret = generic_write_checks(iocb, from);\n+\tif (ret \u003c= 0)\n+\t\tgoto unlock;\n+\n+\tret = file_modified(iocb-\u003eki_filp);\n+\tif (ret)\n+\t\tgoto unlock;\n+\n+\tconst struct iomap_ops *ops = minix_iomap_ops_ver(inode);\n+\n+\tret = iomap_file_buffered_write(iocb, from, ops,\n+\t\t\tNULL, NULL);\n+\n+\tif (ret \u003e 0)\n+\t\tret = generic_write_sync(iocb, ret);\n+\n+unlock:\n+\tinode_unlock(inode);\n+\treturn ret;\n+}\n+\n+static int minix_file_open(struct inode *inode, struct file *filp)\n+{\n+\tfilp-\u003ef_mode |= FMODE_CAN_ODIRECT;\n+\treturn generic_file_open(inode, filp);\n+}\n+\n /*\n- * We have mostly NULLs here: the current defaults are OK for\n- * the minix filesystem.\n+ * We still have some NULLs here, but not as many of the current defaults are\n+ * still OK for the minix filesystem.\n  */\n+\n const struct file_operations minix_file_operations = {\n \t.llseek\t\t= generic_file_llseek,\n-\t.read_iter\t= generic_file_read_iter,\n-\t.write_iter\t= generic_file_write_iter,\n+\t.read_iter\t= minix_file_read_iter,\n+\t.write_iter\t= minix_file_write_iter,\n \t.mmap_prepare\t= generic_file_mmap_prepare,\n+\t.open\t\t= minix_file_open,\n \t.fsync\t\t= minix_fsync,\n \t.splice_read\t= filemap_splice_read,\n+\t.splice_write\t= iter_file_splice_write,\n };\n \n-static int minix_setattr(struct mnt_idmap *idmap,\n-\t\t\t struct dentry *dentry, struct iattr *attr)\n+int minix_setattr(struct mnt_idmap *idmap, struct dentry *dentry,\n+\tstruct iattr *attr)\n {\n \tstruct inode *inode = d_inode(dentry);\n \tint error;\ndiff --git a/fs/minix/inode.c b/fs/minix/inode.c\nindex c30cc590698d6f..b113c44764ff95 100644\n--- a/fs/minix/inode.c\n+++ b/fs/minix/inode.c\n@@ -436,7 +436,32 @@ static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)\n \treturn 0;\n }\n \n-static int minix_get_block(struct inode *inode, sector_t block,\n+static ssize_t minix_writeback_range(struct iomap_writepage_ctx *wpc,\n+\tstruct folio *folio, u64 pos, unsigned int len, u64 end_pos)\n+{\n+\tint error;\n+\n+\tif (pos \u003c wpc-\u003eiomap.offset ||\n+\t\t\tpos \u003e= wpc-\u003eiomap.offset + wpc-\u003eiomap.length) {\n+\t\tif (INODE_VERSION(wpc-\u003einode) == MINIX_V1)\n+\t\t\terror = V1_minix_iomap_begin(wpc-\u003einode, pos, len, IOMAP_WRITE,\n+\t\t\t\t\u0026wpc-\u003eiomap, NULL);\n+\t\telse\n+\t\t\terror = V2_minix_iomap_begin(wpc-\u003einode, pos, len, IOMAP_WRITE,\n+\t\t\t\t\u0026wpc-\u003eiomap, NULL);\n+\t\tif (error)\n+\t\t\treturn error;\n+\t}\n+\n+\treturn iomap_add_to_ioend(wpc, folio, pos, end_pos, len);\n+}\n+\n+static const struct iomap_writeback_ops minix_writeback_ops = {\n+\t.writeback_range = minix_writeback_range,\n+\t.writeback_submit = iomap_ioend_writeback_submit,\n+};\n+\n+int minix_get_block(struct inode *inode, sector_t block,\n \t\t    struct buffer_head *bh_result, int create)\n {\n \tif (INODE_VERSION(inode) == MINIX_V1)\n@@ -445,17 +470,45 @@ static int minix_get_block(struct inode *inode, sector_t block,\n \t\treturn V2_minix_get_block(inode, block, bh_result, create);\n }\n \n-static int minix_writepages(struct address_space *mapping,\n+/* The old minix_writepages, preserved for directory operations. */\n+static int minix_block_writepages(struct address_space *mapping,\n \t\tstruct writeback_control *wbc)\n {\n \treturn mpage_writepages(mapping, wbc, minix_get_block);\n }\n \n+static int minix_writepages(struct address_space *mapping,\n+\t\tstruct writeback_control *wbc)\n+{\n+\tstruct iomap_writepage_ctx wpc = {\n+\t\t.inode = mapping-\u003ehost,\n+\t\t.wbc = wbc,\n+\t\t.ops = \u0026minix_writeback_ops,\n+\t};\n+\treturn iomap_writepages(\u0026wpc);\n+}\n+\n static int minix_read_folio(struct file *file, struct folio *folio)\n+{\n+\tconst struct iomap_ops *ops = minix_iomap_ops_ver(folio-\u003emapping-\u003ehost);\n+\n+\tiomap_bio_read_folio(folio, ops);\n+\treturn 0;\n+}\n+\n+/* The old minix_read_folio, preserved for directory operations. */\n+static int minix_block_read_folio(struct file *file, struct folio *folio)\n {\n \treturn block_read_full_folio(folio, minix_get_block);\n }\n \n+static void minix_readahead(struct readahead_control *rac)\n+{\n+\tconst struct iomap_ops *ops = minix_iomap_ops_ver(rac-\u003emapping-\u003ehost);\n+\n+\tiomap_bio_readahead(rac, ops);\n+}\n+\n int minix_prepare_chunk(struct folio *folio, loff_t pos, unsigned len)\n {\n \treturn __block_write_begin(folio, pos, len, minix_get_block);\n@@ -487,24 +540,42 @@ static int minix_write_begin(const struct kiocb *iocb,\n \n static sector_t minix_bmap(struct address_space *mapping, sector_t block)\n {\n-\treturn generic_block_bmap(mapping,block,minix_get_block);\n+\tconst struct iomap_ops *ops = minix_iomap_ops_ver(mapping-\u003ehost);\n+\n+\treturn iomap_bmap(mapping, block, ops);\n }\n \n-static const struct address_space_operations minix_aops = {\n-\t.dirty_folio\t= block_dirty_folio,\n-\t.invalidate_folio = block_invalidate_folio,\n+const struct address_space_operations minix_aops = {\n+\t.dirty_folio\t= iomap_dirty_folio,\n+\t.invalidate_folio = iomap_invalidate_folio,\n \t.read_folio = minix_read_folio,\n+\t.readahead = minix_readahead,\n \t.writepages = minix_writepages,\n+\t.migrate_folio = filemap_migrate_folio,\n+\t.bmap = minix_bmap,\n+\t.is_partially_uptodate = iomap_is_partially_uptodate,\n+\t.release_folio = iomap_release_folio,\n+\t.error_remove_folio = generic_error_remove_folio,\n+};\n+\n+/* A special aops for directories that keeps using the buffer head chunks, at\n+ * least for the time being.\n+ */\n+static const struct address_space_operations minix_dir_aops = {\n+\t.dirty_folio = block_dirty_folio,\n+\t.invalidate_folio = block_invalidate_folio,\n+\t.read_folio = minix_block_read_folio,\n \t.write_begin = minix_write_begin,\n \t.write_end = generic_write_end,\n \t.migrate_folio = buffer_migrate_folio,\n \t.bmap = minix_bmap,\n-\t.direct_IO = noop_direct_IO\n+\t.writepages = minix_block_writepages,\n };\n \n static const struct inode_operations minix_symlink_inode_operations = {\n-\t.get_link\t= page_get_link,\n+\t.get_link\t= minix_get_link,\n \t.getattr\t= minix_getattr,\n+\t.setattr\t= minix_setattr,\n };\n \n void minix_set_inode(struct inode *inode, dev_t rdev)\n@@ -516,7 +587,7 @@ void minix_set_inode(struct inode *inode, dev_t rdev)\n \t} else if (S_ISDIR(inode-\u003ei_mode)) {\n \t\tinode-\u003ei_op = \u0026minix_dir_inode_operations;\n \t\tinode-\u003ei_fop = \u0026minix_dir_operations;\n-\t\tinode-\u003ei_mapping-\u003ea_ops = \u0026minix_aops;\n+\t\tinode-\u003ei_mapping-\u003ea_ops = \u0026minix_dir_aops;\n \t} else if (S_ISLNK(inode-\u003ei_mode)) {\n \t\tinode-\u003ei_op = \u0026minix_symlink_inode_operations;\n \t\tinode_nohighmem(inode);\n@@ -768,4 +839,3 @@ module_init(init_minix_fs)\n module_exit(exit_minix_fs)\n MODULE_DESCRIPTION(\"Minix file system\");\n MODULE_LICENSE(\"GPL\");\n-\ndiff --git a/fs/minix/iomap.c b/fs/minix/iomap.c\nnew file mode 100644\nindex 00000000000000..7bb0439e366996\n--- /dev/null\n+++ b/fs/minix/iomap.c\n@@ -0,0 +1,114 @@\n+// SPDX-License-Identifier: GPL-2.0-only\n+/*\n+ * iomap functions for minix. At least the first pass of this file was taken\n+ * from the xiafs iomap.c, which is fitting since the xiafs module in turn\n+ * borrowed heavily from the modernized minix fs kernel module.\n+ */\n+\n+/*\n+ * minix_iomap_begin - map a file range to disk blocks. It acts as a replacement\n+ * for get_block in itree_common.c, at least in the important ways, and is\n+ * adapted from it, but it uses iomap instead of buffer_head. This is taken\n+ * directly from the out-of-tree xiafs iomap changes, and the exfat iomap\n+ * changes were an inspiration for that.\n+ */\n+static int minix_iomap_begin(struct inode *inode, loff_t offset, loff_t length,\n+\tunsigned int flags, struct iomap *iomap, struct iomap *srcmap)\n+{\n+\tstruct super_block *sb = inode-\u003ei_sb;\n+\tunsigned int blkbits = sb-\u003es_blocksize_bits;\n+\tsector_t iblock = offset \u003e\u003e blkbits;\n+\tint create = flags \u0026 IOMAP_WRITE;\n+\n+\t/* Mostly taken from modern-xiafs itree.c get_block with elements from\n+\t * similar exfat operations.\n+\t */\n+\tint offsets[DEPTH];\n+\tIndirect chain[DEPTH];\n+\tIndirect *partial;\n+\tint depth = block_to_path(inode, iblock, offsets);\n+\tint left;\n+\tint err = -EIO;\n+\n+\tsector_t phys;\n+\n+\t/* block is beyond max file size */\n+\tif (depth == 0)\n+\t\tgoto out;\n+\n+\tiomap-\u003ebdev = inode-\u003ei_sb-\u003es_bdev;\n+\n+reread:\n+\tpartial = get_branch(inode, depth, offsets, chain, \u0026err);\n+\n+\t/* Simplest case - block found, no allocation needed */\n+\tif (!partial) {\n+\t\t/* Bit of a weird order, but it'll make sense when you get to\n+\t\t * the bottom.\n+\t\t */\n+\t\tiomap-\u003eflags = IOMAP_F_MERGED;\n+got_it:\n+\t\tphys = block_to_cpu(chain[depth - 1].key);\n+\t\tpartial = chain+depth-1;\n+\t\t/* Set up the iomap struct before cleaning up */\n+\t\tiomap-\u003etype = IOMAP_MAPPED;\n+\t\tiomap-\u003eaddr = (u64)phys \u003c\u003c blkbits;\n+\t\tiomap-\u003elength = 1 \u003c\u003c blkbits;\n+\t\tiomap-\u003eoffset = (u64)iblock \u003c\u003c blkbits;\n+\t\tgoto cleanup;\n+\t}\n+\n+\t/* Next simple case - plain lookup or failed read of indirect block */\n+\tif (!create || err == -EIO) {\n+\t\tiomap-\u003etype = IOMAP_HOLE;\n+\t\tiomap-\u003eaddr = IOMAP_NULL_ADDR;\n+\t\tiomap-\u003elength = 1 \u003c\u003c blkbits;\n+\t\tiomap-\u003eoffset = (u64)iblock \u003c\u003c blkbits;\n+\t\tiomap-\u003eflags = 0;\n+cleanup:\n+\t\twhile (partial \u003e chain) {\n+\t\t\tbrelse(partial-\u003ebh);\n+\t\t\tpartial--;\n+\t\t}\n+out:\n+\t\treturn err;\n+\t}\n+\n+\t/*\n+\t * Indirect block might be removed by truncate while we were\n+\t * reading it. Handling of that case (forget what we've got and\n+\t * reread) is taken out of the main path.\n+\t */\n+\tif (err == -EAGAIN)\n+\t\tgoto changed;\n+\n+\tleft = (chain + depth) - partial;\n+\terr = alloc_branch(inode, left, offsets + (partial - chain), partial);\n+\tif (err)\n+\t\tgoto cleanup;\n+\n+\tif (splice_branch(inode, chain, partial, left) \u003c 0)\n+\t\tgoto changed;\n+\n+\t/* Successful allocation, mapping it. */\n+\tiomap-\u003eflags = IOMAP_F_NEW;\n+\tgoto got_it;\n+\n+changed:\n+\twhile (partial \u003e chain) {\n+\t\tbrelse(partial-\u003ebh);\n+\t\tpartial--;\n+\t}\n+\tgoto reread;\n+}\n+\n+/*\n+ * minix_iomap_end ends up being a nop; since minix doesn't have any extents or\n+ * transactions to worry about, there isn't anything to update here. The on-disk\n+ * indirect blocks get dirtied in minix_iomap_begin.\n+ */\n+static int minix_iomap_end(struct inode *inode, loff_t offset, loff_t length,\n+\tssize_t written, unsigned int flags, struct iomap *iomap)\n+{\n+\treturn 0;\n+}\ndiff --git a/fs/minix/itree_common.c b/fs/minix/itree_common.c\nindex c3cd2c75af9cee..5a8b73a7beda78 100644\n--- a/fs/minix/itree_common.c\n+++ b/fs/minix/itree_common.c\n@@ -311,7 +311,16 @@ static inline void truncate (struct inode * inode)\n \tlong iblock;\n \n \tiblock = (inode-\u003ei_size + sb-\u003es_blocksize -1) \u003e\u003e sb-\u003es_blocksize_bits;\n-\tblock_truncate_page(inode-\u003ei_mapping, inode-\u003ei_size, get_block);\n+\n+\t/* Depending on what address space operations are being used by the\n+\t * inode being truncated, we need to either call iomap_truncate_page or\n+\t * block_truncate_page.\n+\t */\n+\tif (inode-\u003ei_mapping-\u003ea_ops == \u0026minix_aops)\n+\t\tiomap_truncate_page(inode, inode-\u003ei_size, NULL,\n+\t\t\tminix_iomap_ops_ver(inode), NULL, NULL);\n+\telse\n+\t\tblock_truncate_page(inode-\u003ei_mapping, inode-\u003ei_size, get_block);\n \n \tn = block_to_path(inode, iblock, offsets);\n \tif (!n)\ndiff --git a/fs/minix/itree_v1.c b/fs/minix/itree_v1.c\nindex 1fed906042aa84..58c29f4443d372 100644\n--- a/fs/minix/itree_v1.c\n+++ b/fs/minix/itree_v1.c\n@@ -49,6 +49,18 @@ static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])\n }\n \n #include \"itree_common.c\"\n+/* NOTA BENE:\n+ *\n+ * This is icky to me, but at the same time having it be a standalone C file\n+ * that's compiled to object form and linked separately like it is in xiafs is\n+ * much nastier in minix because of the different versions of the minix fs that\n+ * have some very, very different aspects, like the size of block_t. I don't\n+ * like it, but since minix already has this pattern where a common itree file\n+ * is included in the itree_v1 and itree_v2(and v3) files, I'm including iomap.c\n+ * in these files as well. It does at least avoid exporting some currently\n+ * static functions that aren't needed anywhere but itree_common.c and iomap.c.\n+ */\n+#include \"iomap.c\"\n \n int V1_minix_get_block(struct inode * inode, long block,\n \t\t\tstruct buffer_head *bh_result, int create)\n@@ -61,7 +73,18 @@ void V1_minix_truncate(struct inode * inode)\n \ttruncate(inode);\n }\n \n-unsigned V1_minix_blocks(loff_t size, struct super_block *sb)\n+unsigned int V1_minix_blocks(loff_t size, struct super_block *sb)\n {\n \treturn nblocks(size, sb);\n }\n+\n+int V1_minix_iomap_begin(struct inode *inode, loff_t offset, loff_t length,\n+\tunsigned int flags, struct iomap *iomap, struct iomap *srcmap)\n+{\n+\treturn minix_iomap_begin(inode, offset, length, flags, iomap, srcmap);\n+}\n+\n+const struct iomap_ops V1_minix_iomap_ops = {\n+\t.iomap_begin = V1_minix_iomap_begin,\n+\t.iomap_end   = minix_iomap_end,\n+};\ndiff --git a/fs/minix/itree_v2.c b/fs/minix/itree_v2.c\nindex 9d00f31a2d9d15..fc7a5ae8fa1ca3 100644\n--- a/fs/minix/itree_v2.c\n+++ b/fs/minix/itree_v2.c\n@@ -57,6 +57,10 @@ static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])\n }\n \n #include \"itree_common.c\"\n+/* See the note in itree_v1 in a comment that starts \"NOTA BENE\" for an\n+ * explanation for why iomap.c is included here.\n+ */\n+#include \"iomap.c\"\n \n int V2_minix_get_block(struct inode * inode, long block,\n \t\t\tstruct buffer_head *bh_result, int create)\n@@ -69,7 +73,18 @@ void V2_minix_truncate(struct inode * inode)\n \ttruncate(inode);\n }\n \n-unsigned V2_minix_blocks(loff_t size, struct super_block *sb)\n+unsigned int V2_minix_blocks(loff_t size, struct super_block *sb)\n {\n \treturn nblocks(size, sb);\n }\n+\n+int V2_minix_iomap_begin(struct inode *inode, loff_t offset, loff_t length,\n+\tunsigned int flags, struct iomap *iomap, struct iomap *srcmap)\n+{\n+\treturn minix_iomap_begin(inode, offset, length, flags, iomap, srcmap);\n+}\n+\n+const struct iomap_ops V2_minix_iomap_ops = {\n+\t.iomap_begin = V2_minix_iomap_begin,\n+\t.iomap_end   = minix_iomap_end,\n+};\ndiff --git a/fs/minix/minix.h b/fs/minix/minix.h\nindex f2025c9b58252f..d1a890e96abe2c 100644\n--- a/fs/minix/minix.h\n+++ b/fs/minix/minix.h\n@@ -5,6 +5,7 @@\n #include \u003clinux/fs.h\u003e\n #include \u003clinux/pagemap.h\u003e\n #include \u003clinux/minix_fs.h\u003e\n+#include \u003clinux/iomap.h\u003e\n \n #define INODE_VERSION(inode)\tminix_sb(inode-\u003ei_sb)-\u003es_version\n #define MINIX_V1\t\t0x0001\t\t/* original minix fs */\n@@ -56,7 +57,9 @@ int minix_new_block(struct inode *inode);\n void minix_free_block(struct inode *inode, unsigned long block);\n unsigned long minix_count_free_blocks(struct super_block *sb);\n int minix_getattr(struct mnt_idmap *, const struct path *,\n-\t\tstruct kstat *, u32, unsigned int);\n+\t\tstruct kstat *, u32, unsigned);\n+int minix_setattr(struct mnt_idmap *idmap, struct dentry *dentry,\n+\tstruct iattr *attr);\n int minix_prepare_chunk(struct folio *folio, loff_t pos, unsigned len);\n struct mapping_metadata_bhs *minix_get_metadata_bhs(struct inode *inode);\n int minix_fsync(struct file *file, loff_t start, loff_t end, int datasync);\n@@ -69,6 +72,8 @@ extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);\n extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);\n extern unsigned V1_minix_blocks(loff_t, struct super_block *);\n extern unsigned V2_minix_blocks(loff_t, struct super_block *);\n+extern int minix_get_block(struct inode *inode, sector_t block,\n+\t\t    struct buffer_head *bh_result, int create);\n \n struct minix_dir_entry *minix_find_entry(struct dentry *, struct folio **);\n int minix_add_link(struct dentry*, struct inode*);\n@@ -77,13 +82,26 @@ int minix_make_empty(struct inode*, struct inode*);\n int minix_empty_dir(struct inode*);\n int minix_set_link(struct minix_dir_entry *de, struct folio *folio,\n \t\tstruct inode *inode);\n+extern const char *minix_get_link(struct dentry *dentry, struct inode *inode,\n+\t\tstruct delayed_call *callback);\n+\n struct minix_dir_entry *minix_dotdot(struct inode*, struct folio **);\n ino_t minix_inode_by_name(struct dentry*);\n \n+extern int V1_minix_iomap_begin(struct inode *inode, loff_t offset,\n+\tloff_t length, unsigned int flags, struct iomap *iomap,\n+\tstruct iomap *srcmap);\n+extern int V2_minix_iomap_begin(struct inode *inode, loff_t offset,\n+\tloff_t length, unsigned int flags, struct iomap *iomap,\n+\tstruct iomap *srcmap);\n+\n+extern const struct address_space_operations minix_aops;\n extern const struct inode_operations minix_file_inode_operations;\n extern const struct inode_operations minix_dir_inode_operations;\n extern const struct file_operations minix_file_operations;\n extern const struct file_operations minix_dir_operations;\n+extern const struct iomap_ops V1_minix_iomap_ops;\n+extern const struct iomap_ops V2_minix_iomap_ops;\n \n static inline struct minix_sb_info *minix_sb(struct super_block *sb)\n {\n@@ -95,11 +113,17 @@ static inline struct minix_inode_info *minix_i(struct inode *inode)\n \treturn container_of(inode, struct minix_inode_info, vfs_inode);\n }\n \n-static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)\n+static inline unsigned int minix_blocks_needed(unsigned int bits, unsigned int blocksize)\n {\n \treturn DIV_ROUND_UP(bits, blocksize * 8);\n }\n \n+static inline const struct iomap_ops *minix_iomap_ops_ver(struct inode *inode)\n+{\n+\treturn (INODE_VERSION(inode) == MINIX_V1) ?\n+\t\t\u0026V1_minix_iomap_ops : \u0026V2_minix_iomap_ops;\n+}\n+\n #if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) \u0026\u0026 \\\n \tdefined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)\n \n@@ -129,7 +153,7 @@ static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)\n  * big-endian 16bit indexed bitmaps\n  */\n \n-static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)\n+static inline int minix_find_first_zero_bit(const void *vaddr, unsigned int size)\n {\n \tconst unsigned short *p = vaddr, *addr = vaddr;\n \tunsigned short num;\ndiff --git a/fs/minix/namei.c b/fs/minix/namei.c\nindex 263e4ba8b1c822..e245f55a68ff5d 100644\n--- a/fs/minix/namei.c\n+++ b/fs/minix/namei.c\n@@ -6,6 +6,8 @@\n  */\n \n #include \"minix.h\"\n+#include \u003clinux/buffer_head.h\u003e\n+#include \u003clinux/namei.h\u003e\n \n static int add_nondir(struct dentry *dentry, struct inode *inode)\n {\n@@ -69,6 +71,101 @@ static int minix_create(struct mnt_idmap *idmap, struct inode *dir,\n \treturn minix_mknod(\u0026nop_mnt_idmap, dir, dentry, mode, 0);\n }\n \n+static inline u16 *v1_i_data(struct inode *inode)\n+{\n+\treturn (u16 *)minix_i(inode)-\u003eu.i1_data;\n+}\n+\n+static inline u32 *v2_i_data(struct inode *inode)\n+{\n+\treturn (u32 *)minix_i(inode)-\u003eu.i2_data;\n+}\n+\n+static inline u16 cpu_to_v1_block(sector_t n)\n+{\n+\treturn n;\n+}\n+\n+static inline u32 cpu_to_v2_block(sector_t n)\n+{\n+\treturn n;\n+}\n+\n+static inline sector_t v1_block_to_cpu(u16 n)\n+{\n+\treturn n;\n+}\n+\n+static inline sector_t v2_block_to_cpu(u32 n)\n+{\n+\treturn n;\n+}\n+\n+/* Reimplement page_symlink's general logic while avoiding using buffer head\n+ * based aops operations like aops-\u003ewrite_begin so things behave better with\n+ * the new regime of iomap based aops operations. Cribbing from page_symlink in\n+ * fs/namei.c and ext4's ext4_init_symlink_block.\n+ */\n+static int __page_symlink(struct inode *inode, const char *symname, int len)\n+{\n+\tstruct super_block *sb = inode-\u003ei_sb;\n+\tstruct buffer_head *bh;\n+\tchar *kaddr;\n+\tint err = 0;\n+\tu16 *p16; /* v1 16 bit block */\n+\tu32 *p32; /* v2/3 32 bit block */\n+\n+\tsector_t phys;\n+\n+\tphys = minix_new_block(inode);\n+\tif (!phys) {\n+\t\terr = -ENOSPC;\n+\t\tgoto ps_out;\n+\t}\n+\n+\tif (INODE_VERSION(inode) == MINIX_V1) {\n+\t\tp16 = v1_i_data(inode);\n+\t\t*p16 = cpu_to_v1_block(phys);\n+\t} else {\n+\t\tp32 = v2_i_data(inode);\n+\t\t*p32 = cpu_to_v2_block(phys);\n+\t}\n+\n+\tbh = sb_getblk(sb, phys);\n+\tif (!bh) {\n+\t\terr = -ENOMEM;\n+\t\tgoto ps_fail;\n+\t}\n+\n+\tlock_buffer(bh);\n+\tkaddr = (char *)bh-\u003eb_data;\n+\tmemset(kaddr, 0, sb-\u003es_blocksize);\n+\tmemcpy(kaddr, symname, len);\n+\tinode-\u003ei_size = len - 1;\n+\tset_buffer_uptodate(bh);\n+\tunlock_buffer(bh);\n+\n+\tmmb_mark_buffer_dirty(bh, \u0026minix_i(inode)-\u003ei_metadata_bhs);\n+\tif (inode_needs_sync(inode)) {\n+\t\tsync_dirty_buffer(bh);\n+\t\tif (buffer_req(bh) \u0026\u0026 !buffer_uptodate(bh)) {\n+\t\t\tpr_err(\"i/o error syncing itable block\");\n+\t\t\terr = -EIO;\n+\t\t}\n+\n+\t}\n+\n+\tmark_inode_dirty(inode);\n+\tbrelse(bh);\n+\n+ps_out:\n+\treturn err;\n+\n+ps_fail:\n+\tminix_free_block(inode, phys);\n+\tgoto ps_out;\n+}\n+\n static int minix_symlink(struct mnt_idmap *idmap, struct inode *dir,\n \t\t\t struct dentry *dentry, const char *symname)\n {\n@@ -84,7 +181,7 @@ static int minix_symlink(struct mnt_idmap *idmap, struct inode *dir,\n \t\treturn PTR_ERR(inode);\n \n \tminix_set_inode(inode, 0);\n-\terr = page_symlink(inode, symname, i);\n+\terr = __page_symlink(inode, symname, i);\n \tif (unlikely(err)) {\n \t\tinode_dec_link_count(inode);\n \t\tiput(inode);\n@@ -273,6 +370,44 @@ static int minix_rename(struct mnt_idmap *idmap,\n \treturn err;\n }\n \n+/* straight up thievery here; stolen verbatim from ext4_get_link */\n+static void minix_free_link(void *bh)\n+{\n+\tbrelse(bh);\n+}\n+\n+/* Borrowing from ext4_get_link to a degree; since minix inodes and symlinks\n+ * are significantly simpler, we don't need to do nearly as much as ext4\n+ * requires for old-timey ext4 slow links.\n+ */\n+const char *minix_get_link(struct dentry *dentry, struct inode *inode,\n+\t\tstruct delayed_call *callback)\n+{\n+\tstruct super_block *sb = inode-\u003ei_sb;\n+\tstruct buffer_head *bh;\n+\tsector_t blk;\n+\n+\t/* Get yon block, depending on what version of the minix fs this is. */\n+\tif (INODE_VERSION(inode) == MINIX_V1)\n+\t\tblk = v1_block_to_cpu(*(v1_i_data(inode)));\n+\telse\n+\t\tblk = v2_block_to_cpu(*(v2_i_data(inode)));\n+\n+\tbh = sb_bread(sb, blk);\n+\tif (IS_ERR(bh))\n+\t\treturn ERR_CAST(bh);\n+\tif (!bh) {\n+\t\tpr_err(\"bad symlink on inode %llu\", inode-\u003ei_ino);\n+\t\treturn ERR_PTR(-EFSCORRUPTED);\n+\t}\n+\n+\tset_delayed_call(callback, minix_free_link, bh);\n+\tnd_terminate_link(bh-\u003eb_data, inode-\u003ei_size,\n+\t\t\tinode-\u003ei_sb-\u003es_blocksize - 1);\n+\n+\treturn bh-\u003eb_data;\n+}\n+\n /*\n  * directories can handle most operations...\n  */\n"
}
2/1 2026/06/28 05:33 agent patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
{
  "EnableConfigs": [
    "MINIX_FS"
  ],
  "FocusSymbols": [
    "minix_dio_read_iter",
    "minix_dio_write_iter",
    "minix_dio_write_end_io",
    "minix_file_read_iter",
    "minix_file_write_iter",
    "minix_iomap_begin",
    "minix_iomap_end",
    "V1_minix_iomap_begin",
    "V2_minix_iomap_begin",
    "minix_writeback_range",
    "minix_writepages",
    "minix_read_folio",
    "minix_readahead",
    "minix_bmap",
    "__page_symlink",
    "minix_get_link",
    "minix_free_link"
  ],
  "Reasoning": "The patch implements iomap-based direct I/O and buffered I/O for the minix filesystem, which is a functional change to the core filesystem logic. It modifies read/write paths, block mapping, and symlink handling.",
  "WorthFuzzing": true
}

Instruction: 
You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Do not list too generic configs (we already have them enabled). Only list those that
   specifically cover the modified code. List them in the EnableConfigs output array,
   and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Prompt: 
For your convenience, here is the diff of the changes:
commit a44eef86fda4b737576c283ad05e48d91bbb21a5
Author: syz-cluster <triage@syzkaller.com>
Date:   Sun Jun 28 05:33:02 2026 +0000

    syz-cluster: applied patch under review

diff --git a/fs/minix/file.c b/fs/minix/file.c
index 86e5943cd2ff74..b07c853fa43abc 100644
--- a/fs/minix/file.c
+++ b/fs/minix/file.c
@@ -17,21 +17,166 @@ int minix_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 			start, end, datasync);
 }
 
+static ssize_t minix_dio_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+	struct inode *inode = iocb->ki_filp->f_mapping->host;
+	ssize_t ret;
+
+	inode_lock_shared(inode);
+
+	const struct iomap_ops *ops = minix_iomap_ops_ver(inode);
+
+	ret = iomap_dio_rw(iocb, to, ops, NULL, 0, NULL, 0);
+	inode_unlock_shared(inode);
+	return ret;
+}
+
+static int minix_dio_write_end_io(struct kiocb *iocb, ssize_t size, int error,
+		unsigned int flags)
+{
+	struct inode *inode = file_inode(iocb->ki_filp);
+	loff_t pos = iocb->ki_pos;
+
+	if (error)
+		return error;
+
+	pos += size;
+	if (size && pos > i_size_read(inode)) {
+		i_size_write(inode, pos);
+		mark_inode_dirty(inode);
+	}
+	return 0;
+}
+
+static const struct iomap_dio_ops minix_dio_write_ops = {
+	.end_io = minix_dio_write_end_io,
+};
+
+static ssize_t minix_dio_write_iter(struct kiocb *iocb, struct iov_iter *from)
+{
+	struct inode *inode = iocb->ki_filp->f_mapping->host;
+	ssize_t ret;
+	unsigned int flags = 0;
+	unsigned long blocksize = inode->i_sb->s_blocksize;
+
+	inode_lock(inode);
+	ret = generic_write_checks(iocb, from);
+	if (ret <= 0)
+		goto out_unlock;
+
+	ret = kiocb_modified(iocb);
+	if (ret)
+		goto out_unlock;
+
+	if (iocb->ki_pos + iov_iter_count(from) > i_size_read(inode) ||
+		!IS_ALIGNED(iocb->ki_pos | iov_iter_alignment(from), blocksize))
+		flags |= IOMAP_DIO_FORCE_WAIT;
+
+	const struct iomap_ops *ops = minix_iomap_ops_ver(inode);
+
+	ret = iomap_dio_rw(iocb, from, ops,
+		&minix_dio_write_ops, flags, NULL, 0);
+	if (ret == -ENOTBLK)
+		ret = 0; /* fallback to buffered */
+
+	if (ret >= 0 && iov_iter_count(from)) {
+		loff_t pos;
+		loff_t endbyte;
+		ssize_t status;
+
+		iocb->ki_flags &= ~IOCB_DIRECT;
+		pos = iocb->ki_pos;
+		status = iomap_file_buffered_write(iocb, from, ops,
+			NULL, NULL);
+		if (unlikely(status < 0)) {
+			ret = status;
+			goto out_unlock;
+		}
+
+		ret += status;
+		endbyte = pos + status - 1;
+		status = filemap_write_and_wait_range(inode->i_mapping, pos, endbyte);
+		if (!status) {
+			invalidate_mapping_pages(inode->i_mapping,
+				pos >> PAGE_SHIFT,
+				endbyte >> PAGE_SHIFT);
+			if (ret > 0)
+				ret = generic_write_sync(iocb, ret);
+		} else {
+			ret = status;
+		}
+	}
+
+out_unlock:
+	inode_unlock(inode);
+	return ret;
+}
+
+static ssize_t minix_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+	if (iocb->ki_flags & IOCB_DIRECT)
+		return minix_dio_read_iter(iocb, to);
+
+	return generic_file_read_iter(iocb, to);
+}
+
+static ssize_t minix_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
+{
+	struct inode *inode = iocb->ki_filp->f_mapping->host;
+	ssize_t ret;
+
+	/* minix_dio_write_iter also locks the inode and appears to do the same
+	 * general sorts of checks as this, so just return directly from there.
+	 */
+	if (iocb->ki_flags & IOCB_DIRECT)
+		return minix_dio_write_iter(iocb, from);
+
+	inode_lock(inode);
+	ret = generic_write_checks(iocb, from);
+	if (ret <= 0)
+		goto unlock;
+
+	ret = file_modified(iocb->ki_filp);
+	if (ret)
+		goto unlock;
+
+	const struct iomap_ops *ops = minix_iomap_ops_ver(inode);
+
+	ret = iomap_file_buffered_write(iocb, from, ops,
+			NULL, NULL);
+
+	if (ret > 0)
+		ret = generic_write_sync(iocb, ret);
+
+unlock:
+	inode_unlock(inode);
+	return ret;
+}
+
+static int minix_file_open(struct inode *inode, struct file *filp)
+{
+	filp->f_mode |= FMODE_CAN_ODIRECT;
+	return generic_file_open(inode, filp);
+}
+
 /*
- * We have mostly NULLs here: the current defaults are OK for
- * the minix filesystem.
+ * We still have some NULLs here, but not as many of the current defaults are
+ * still OK for the minix filesystem.
  */
+
 const struct file_operations minix_file_operations = {
 	.llseek		= generic_file_llseek,
-	.read_iter	= generic_file_read_iter,
-	.write_iter	= generic_file_write_iter,
+	.read_iter	= minix_file_read_iter,
+	.write_iter	= minix_file_write_iter,
 	.mmap_prepare	= generic_file_mmap_prepare,
+	.open		= minix_file_open,
 	.fsync		= minix_fsync,
 	.splice_read	= filemap_splice_read,
+	.splice_write	= iter_file_splice_write,
 };
 
-static int minix_setattr(struct mnt_idmap *idmap,
-			 struct dentry *dentry, struct iattr *attr)
+int minix_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
+	struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	int error;
diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index c30cc590698d6f..b113c44764ff95 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -436,7 +436,32 @@ static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
 	return 0;
 }
 
-static int minix_get_block(struct inode *inode, sector_t block,
+static ssize_t minix_writeback_range(struct iomap_writepage_ctx *wpc,
+	struct folio *folio, u64 pos, unsigned int len, u64 end_pos)
+{
+	int error;
+
+	if (pos < wpc->iomap.offset ||
+			pos >= wpc->iomap.offset + wpc->iomap.length) {
+		if (INODE_VERSION(wpc->inode) == MINIX_V1)
+			error = V1_minix_iomap_begin(wpc->inode, pos, len, IOMAP_WRITE,
+				&wpc->iomap, NULL);
+		else
+			error = V2_minix_iomap_begin(wpc->inode, pos, len, IOMAP_WRITE,
+				&wpc->iomap, NULL);
+		if (error)
+			return error;
+	}
+
+	return iomap_add_to_ioend(wpc, folio, pos, end_pos, len);
+}
+
+static const struct iomap_writeback_ops minix_writeback_ops = {
+	.writeback_range = minix_writeback_range,
+	.writeback_submit = iomap_ioend_writeback_submit,
+};
+
+int minix_get_block(struct inode *inode, sector_t block,
 		    struct buffer_head *bh_result, int create)
 {
 	if (INODE_VERSION(inode) == MINIX_V1)
@@ -445,17 +470,45 @@ static int minix_get_block(struct inode *inode, sector_t block,
 		return V2_minix_get_block(inode, block, bh_result, create);
 }
 
-static int minix_writepages(struct address_space *mapping,
+/* The old minix_writepages, preserved for directory operations. */
+static int minix_block_writepages(struct address_space *mapping,
 		struct writeback_control *wbc)
 {
 	return mpage_writepages(mapping, wbc, minix_get_block);
 }
 
+static int minix_writepages(struct address_space *mapping,
+		struct writeback_control *wbc)
+{
+	struct iomap_writepage_ctx wpc = {
+		.inode = mapping->host,
+		.wbc = wbc,
+		.ops = &minix_writeback_ops,
+	};
+	return iomap_writepages(&wpc);
+}
+
 static int minix_read_folio(struct file *file, struct folio *folio)
+{
+	const struct iomap_ops *ops = minix_iomap_ops_ver(folio->mapping->host);
+
+	iomap_bio_read_folio(folio, ops);
+	return 0;
+}
+
+/* The old minix_read_folio, preserved for directory operations. */
+static int minix_block_read_folio(struct file *file, struct folio *folio)
 {
 	return block_read_full_folio(folio, minix_get_block);
 }
 
+static void minix_readahead(struct readahead_control *rac)
+{
+	const struct iomap_ops *ops = minix_iomap_ops_ver(rac->mapping->host);
+
+	iomap_bio_readahead(rac, ops);
+}
+
 int minix_prepare_chunk(struct folio *folio, loff_t pos, unsigned len)
 {
 	return __block_write_begin(folio, pos, len, minix_get_block);
@@ -487,24 +540,42 @@ static int minix_write_begin(const struct kiocb *iocb,
 
 static sector_t minix_bmap(struct address_space *mapping, sector_t block)
 {
-	return generic_block_bmap(mapping,block,minix_get_block);
+	const struct iomap_ops *ops = minix_iomap_ops_ver(mapping->host);
+
+	return iomap_bmap(mapping, block, ops);
 }
 
-static const struct address_space_operations minix_aops = {
-	.dirty_folio	= block_dirty_folio,
-	.invalidate_folio = block_invalidate_folio,
+const struct address_space_operations minix_aops = {
+	.dirty_folio	= iomap_dirty_folio,
+	.invalidate_folio = iomap_invalidate_folio,
 	.read_folio = minix_read_folio,
+	.readahead = minix_readahead,
 	.writepages = minix_writepages,
+	.migrate_folio = filemap_migrate_folio,
+	.bmap = minix_bmap,
+	.is_partially_uptodate = iomap_is_partially_uptodate,
+	.release_folio = iomap_release_folio,
+	.error_remove_folio = generic_error_remove_folio,
+};
+
+/* A special aops for directories that keeps using the buffer head chunks, at
+ * least for the time being.
+ */
+static const struct address_space_operations minix_dir_aops = {
+	.dirty_folio = block_dirty_folio,
+	.invalidate_folio = block_invalidate_folio,
+	.read_folio = minix_block_read_folio,
 	.write_begin = minix_write_begin,
 	.write_end = generic_write_end,
 	.migrate_folio = buffer_migrate_folio,
 	.bmap = minix_bmap,
-	.direct_IO = noop_direct_IO
+	.writepages = minix_block_writepages,
 };
 
 static const struct inode_operations minix_symlink_inode_operations = {
-	.get_link	= page_get_link,
+	.get_link	= minix_get_link,
 	.getattr	= minix_getattr,
+	.setattr	= minix_setattr,
 };
 
 void minix_set_inode(struct inode *inode, dev_t rdev)
@@ -516,7 +587,7 @@ void minix_set_inode(struct inode *inode, dev_t rdev)
 	} else if (S_ISDIR(inode->i_mode)) {
 		inode->i_op = &minix_dir_inode_operations;
 		inode->i_fop = &minix_dir_operations;
-		inode->i_mapping->a_ops = &minix_aops;
+		inode->i_mapping->a_ops = &minix_dir_aops;
 	} else if (S_ISLNK(inode->i_mode)) {
 		inode->i_op = &minix_symlink_inode_operations;
 		inode_nohighmem(inode);
@@ -768,4 +839,3 @@ module_init(init_minix_fs)
 module_exit(exit_minix_fs)
 MODULE_DESCRIPTION("Minix file system");
 MODULE_LICENSE("GPL");
-
diff --git a/fs/minix/iomap.c b/fs/minix/iomap.c
new file mode 100644
index 00000000000000..7bb0439e366996
--- /dev/null
+++ b/fs/minix/iomap.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * iomap functions for minix. At least the first pass of this file was taken
+ * from the xiafs iomap.c, which is fitting since the xiafs module in turn
+ * borrowed heavily from the modernized minix fs kernel module.
+ */
+
+/*
+ * minix_iomap_begin - map a file range to disk blocks. It acts as a replacement
+ * for get_block in itree_common.c, at least in the important ways, and is
+ * adapted from it, but it uses iomap instead of buffer_head. This is taken
+ * directly from the out-of-tree xiafs iomap changes, and the exfat iomap
+ * changes were an inspiration for that.
+ */
+static int minix_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
+	unsigned int flags, struct iomap *iomap, struct iomap *srcmap)
+{
+	struct super_block *sb = inode->i_sb;
+	unsigned int blkbits = sb->s_blocksize_bits;
+	sector_t iblock = offset >> blkbits;
+	int create = flags & IOMAP_WRITE;
+
+	/* Mostly taken from modern-xiafs itree.c get_block with elements from
+	 * similar exfat operations.
+	 */
+	int offsets[DEPTH];
+	Indirect chain[DEPTH];
+	Indirect *partial;
+	int depth = block_to_path(inode, iblock, offsets);
+	int left;
+	int err = -EIO;
+
+	sector_t phys;
+
+	/* block is beyond max file size */
+	if (depth == 0)
+		goto out;
+
+	iomap->bdev = inode->i_sb->s_bdev;
+
+reread:
+	partial = get_branch(inode, depth, offsets, chain, &err);
+
+	/* Simplest case - block found, no allocation needed */
+	if (!partial) {
+		/* Bit of a weird order, but it'll make sense when you get to
+		 * the bottom.
+		 */
+		iomap->flags = IOMAP_F_MERGED;
+got_it:
+		phys = block_to_cpu(chain[depth - 1].key);
+		partial = chain+depth-1;
+		/* Set up the iomap struct before cleaning up */
+		iomap->type = IOMAP_MAPPED;
+		iomap->addr = (u64)phys << blkbits;
+		iomap->length = 1 << blkbits;
+		iomap->offset = (u64)iblock << blkbits;
+		goto cleanup;
+	}
+
+	/* Next simple case - plain lookup or failed read of indirect block */
+	if (!create || err == -EIO) {
+		iomap->type = IOMAP_HOLE;
+		iomap->addr = IOMAP_NULL_ADDR;
+		iomap->length = 1 << blkbits;
+		iomap->offset = (u64)iblock << blkbits;
+		iomap->flags = 0;
+cleanup:
+		while (partial > chain) {
+			brelse(partial->bh);
+			partial--;
+		}
+out:
+		return err;
+	}
+
+	/*
+	 * Indirect block might be removed by truncate while we were
+	 * reading it. Handling of that case (forget what we've got and
+	 * reread) is taken out of the main path.
+	 */
+	if (err == -EAGAIN)
+		goto changed;
+
+	left = (chain + depth) - partial;
+	err = alloc_branch(inode, left, offsets + (partial - chain), partial);
+	if (err)
+		goto cleanup;
+
+	if (splice_branch(inode, chain, partial, left) < 0)
+		goto changed;
+
+	/* Successful allocation, mapping it. */
+	iomap->flags = IOMAP_F_NEW;
+	goto got_it;
+
+changed:
+	while (partial > chain) {
+		brelse(partial->bh);
+		partial--;
+	}
+	goto reread;
+}
+
+/*
+ * minix_iomap_end ends up being a nop; since minix doesn't have any extents or
+ * transactions to worry about, there isn't anything to update here. The on-disk
+ * indirect blocks get dirtied in minix_iomap_begin.
+ */
+static int minix_iomap_end(struct inode *inode, loff_t offset, loff_t length,
+	ssize_t written, unsigned int flags, struct iomap *iomap)
+{
+	return 0;
+}
diff --git a/fs/minix/itree_common.c b/fs/minix/itree_common.c
index c3cd2c75af9cee..5a8b73a7beda78 100644
--- a/fs/minix/itree_common.c
+++ b/fs/minix/itree_common.c
@@ -311,7 +311,16 @@ static inline void truncate (struct inode * inode)
 	long iblock;
 
 	iblock = (inode->i_size + sb->s_blocksize -1) >> sb->s_blocksize_bits;
-	block_truncate_page(inode->i_mapping, inode->i_size, get_block);
+
+	/* Depending on what address space operations are being used by the
+	 * inode being truncated, we need to either call iomap_truncate_page or
+	 * block_truncate_page.
+	 */
+	if (inode->i_mapping->a_ops == &minix_aops)
+		iomap_truncate_page(inode, inode->i_size, NULL,
+			minix_iomap_ops_ver(inode), NULL, NULL);
+	else
+		block_truncate_page(inode->i_mapping, inode->i_size, get_block);
 
 	n = block_to_path(inode, iblock, offsets);
 	if (!n)
diff --git a/fs/minix/itree_v1.c b/fs/minix/itree_v1.c
index 1fed906042aa84..58c29f4443d372 100644
--- a/fs/minix/itree_v1.c
+++ b/fs/minix/itree_v1.c
@@ -49,6 +49,18 @@ static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
 }
 
 #include "itree_common.c"
+/* NOTA BENE:
+ *
+ * This is icky to me, but at the same time having it be a standalone C file
+ * that's compiled to object form and linked separately like it is in xiafs is
+ * much nastier in minix because of the different versions of the minix fs that
+ * have some very, very different aspects, like the size of block_t. I don't
+ * like it, but since minix already has this pattern where a common itree file
+ * is included in the itree_v1 and itree_v2(and v3) files, I'm including iomap.c
+ * in these files as well. It does at least avoid exporting some currently
+ * static functions that aren't needed anywhere but itree_common.c and iomap.c.
+ */
+#include "iomap.c"
 
 int V1_minix_get_block(struct inode * inode, long block,
 			struct buffer_head *bh_result, int create)
@@ -61,7 +73,18 @@ void V1_minix_truncate(struct inode * inode)
 	truncate(inode);
 }
 
-unsigned V1_minix_blocks(loff_t size, struct super_block *sb)
+unsigned int V1_minix_blocks(loff_t size, struct super_block *sb)
 {
 	return nblocks(size, sb);
 }
+
+int V1_minix_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
+	unsigned int flags, struct iomap *iomap, struct iomap *srcmap)
+{
+	return minix_iomap_begin(inode, offset, length, flags, iomap, srcmap);
+}
+
+const struct iomap_ops V1_minix_iomap_ops = {
+	.iomap_begin = V1_minix_iomap_begin,
+	.iomap_end   = minix_iomap_end,
+};
diff --git a/fs/minix/itree_v2.c b/fs/minix/itree_v2.c
index 9d00f31a2d9d15..fc7a5ae8fa1ca3 100644
--- a/fs/minix/itree_v2.c
+++ b/fs/minix/itree_v2.c
@@ -57,6 +57,10 @@ static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
 }
 
 #include "itree_common.c"
+/* See the note in itree_v1 in a comment that starts "NOTA BENE" for an
+ * explanation for why iomap.c is included here.
+ */
+#include "iomap.c"
 
 int V2_minix_get_block(struct inode * inode, long block,
 			struct buffer_head *bh_result, int create)
@@ -69,7 +73,18 @@ void V2_minix_truncate(struct inode * inode)
 	truncate(inode);
 }
 
-unsigned V2_minix_blocks(loff_t size, struct super_block *sb)
+unsigned int V2_minix_blocks(loff_t size, struct super_block *sb)
 {
 	return nblocks(size, sb);
 }
+
+int V2_minix_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
+	unsigned int flags, struct iomap *iomap, struct iomap *srcmap)
+{
+	return minix_iomap_begin(inode, offset, length, flags, iomap, srcmap);
+}
+
+const struct iomap_ops V2_minix_iomap_ops = {
+	.iomap_begin = V2_minix_iomap_begin,
+	.iomap_end   = minix_iomap_end,
+};
diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index f2025c9b58252f..d1a890e96abe2c 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -5,6 +5,7 @@
 #include <linux/fs.h>
 #include <linux/pagemap.h>
 #include <linux/minix_fs.h>
+#include <linux/iomap.h>
 
 #define INODE_VERSION(inode)	minix_sb(inode->i_sb)->s_version
 #define MINIX_V1		0x0001		/* original minix fs */
@@ -56,7 +57,9 @@ int minix_new_block(struct inode *inode);
 void minix_free_block(struct inode *inode, unsigned long block);
 unsigned long minix_count_free_blocks(struct super_block *sb);
 int minix_getattr(struct mnt_idmap *, const struct path *,
-		struct kstat *, u32, unsigned int);
+		struct kstat *, u32, unsigned);
+int minix_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
+	struct iattr *attr);
 int minix_prepare_chunk(struct folio *folio, loff_t pos, unsigned len);
 struct mapping_metadata_bhs *minix_get_metadata_bhs(struct inode *inode);
 int minix_fsync(struct file *file, loff_t start, loff_t end, int datasync);
@@ -69,6 +72,8 @@ extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
 extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
 extern unsigned V1_minix_blocks(loff_t, struct super_block *);
 extern unsigned V2_minix_blocks(loff_t, struct super_block *);
+extern int minix_get_block(struct inode *inode, sector_t block,
+		    struct buffer_head *bh_result, int create);
 
 struct minix_dir_entry *minix_find_entry(struct dentry *, struct folio **);
 int minix_add_link(struct dentry*, struct inode*);
@@ -77,13 +82,26 @@ int minix_make_empty(struct inode*, struct inode*);
 int minix_empty_dir(struct inode*);
 int minix_set_link(struct minix_dir_entry *de, struct folio *folio,
 		struct inode *inode);
+extern const char *minix_get_link(struct dentry *dentry, struct inode *inode,
+		struct delayed_call *callback);
+
 struct minix_dir_entry *minix_dotdot(struct inode*, struct folio **);
 ino_t minix_inode_by_name(struct dentry*);
 
+extern int V1_minix_iomap_begin(struct inode *inode, loff_t offset,
+	loff_t length, unsigned int flags, struct iomap *iomap,
+	struct iomap *srcmap);
+extern int V2_minix_iomap_begin(struct inode *inode, loff_t offset,
+	loff_t length, unsigned int flags, struct iomap *iomap,
+	struct iomap *srcmap);
+
+extern const struct address_space_operations minix_aops;
 extern const struct inode_operations minix_file_inode_operations;
 extern const struct inode_operations minix_dir_inode_operations;
 extern const struct file_operations minix_file_operations;
 extern const struct file_operations minix_dir_operations;
+extern const struct iomap_ops V1_minix_iomap_ops;
+extern const struct iomap_ops V2_minix_iomap_ops;
 
 static inline struct minix_sb_info *minix_sb(struct super_block *sb)
 {
@@ -95,11 +113,17 @@ static inline struct minix_inode_info *minix_i(struct inode *inode)
 	return container_of(inode, struct minix_inode_info, vfs_inode);
 }
 
-static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)
+static inline unsigned int minix_blocks_needed(unsigned int bits, unsigned int blocksize)
 {
 	return DIV_ROUND_UP(bits, blocksize * 8);
 }
 
+static inline const struct iomap_ops *minix_iomap_ops_ver(struct inode *inode)
+{
+	return (INODE_VERSION(inode) == MINIX_V1) ?
+		&V1_minix_iomap_ops : &V2_minix_iomap_ops;
+}
+
 #if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \
 	defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
 
@@ -129,7 +153,7 @@ static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)
  * big-endian 16bit indexed bitmaps
  */
 
-static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
+static inline int minix_find_first_zero_bit(const void *vaddr, unsigned int size)
 {
 	const unsigned short *p = vaddr, *addr = vaddr;
 	unsigned short num;
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 263e4ba8b1c822..e245f55a68ff5d 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -6,6 +6,8 @@
  */
 
 #include "minix.h"
+#include <linux/buffer_head.h>
+#include <linux/namei.h>
 
 static int add_nondir(struct dentry *dentry, struct inode *inode)
 {
@@ -69,6 +71,101 @@ static int minix_create(struct mnt_idmap *idmap, struct inode *dir,
 	return minix_mknod(&nop_mnt_idmap, dir, dentry, mode, 0);
 }
 
+static inline u16 *v1_i_data(struct inode *inode)
+{
+	return (u16 *)minix_i(inode)->u.i1_data;
+}
+
+static inline u32 *v2_i_data(struct inode *inode)
+{
+	return (u32 *)minix_i(inode)->u.i2_data;
+}
+
+static inline u16 cpu_to_v1_block(sector_t n)
+{
+	return n;
+}
+
+static inline u32 cpu_to_v2_block(sector_t n)
+{
+	return n;
+}
+
+static inline sector_t v1_block_to_cpu(u16 n)
+{
+	return n;
+}
+
+static inline sector_t v2_block_to_cpu(u32 n)
+{
+	return n;
+}
+
+/* Reimplement page_symlink's general logic while avoiding using buffer head
+ * based aops operations like aops->write_begin so things behave better with
+ * the new regime of iomap based aops operations. Cribbing from page_symlink in
+ * fs/namei.c and ext4's ext4_init_symlink_block.
+ */
+static int __page_symlink(struct inode *inode, const char *symname, int len)
+{
+	struct super_block *sb = inode->i_sb;
+	struct buffer_head *bh;
+	char *kaddr;
+	int err = 0;
+	u16 *p16; /* v1 16 bit block */
+	u32 *p32; /* v2/3 32 bit block */
+
+	sector_t phys;
+
+	phys = minix_new_block(inode);
+	if (!phys) {
+		err = -ENOSPC;
+		goto ps_out;
+	}
+
+	if (INODE_VERSION(inode) == MINIX_V1) {
+		p16 = v1_i_data(inode);
+		*p16 = cpu_to_v1_block(phys);
+	} else {
+		p32 = v2_i_data(inode);
+		*p32 = cpu_to_v2_block(phys);
+	}
+
+	bh = sb_getblk(sb, phys);
+	if (!bh) {
+		err = -ENOMEM;
+		goto ps_fail;
+	}
+
+	lock_buffer(bh);
+	kaddr = (char *)bh->b_data;
+	memset(kaddr, 0, sb->s_blocksize);
+	memcpy(kaddr, symname, len);
+	inode->i_size = len - 1;
+	set_buffer_uptodate(bh);
+	unlock_buffer(bh);
+
+	mmb_mark_buffer_dirty(bh, &minix_i(inode)->i_metadata_bhs);
+	if (inode_needs_sync(inode)) {
+		sync_dirty_buffer(bh);
+		if (buffer_req(bh) && !buffer_uptodate(bh)) {
+			pr_err("i/o error syncing itable block");
+			err = -EIO;
+		}
+
+	}
+
+	mark_inode_dirty(inode);
+	brelse(bh);
+
+ps_out:
+	return err;
+
+ps_fail:
+	minix_free_block(inode, phys);
+	goto ps_out;
+}
+
 static int minix_symlink(struct mnt_idmap *idmap, struct inode *dir,
 			 struct dentry *dentry, const char *symname)
 {
@@ -84,7 +181,7 @@ static int minix_symlink(struct mnt_idmap *idmap, struct inode *dir,
 		return PTR_ERR(inode);
 
 	minix_set_inode(inode, 0);
-	err = page_symlink(inode, symname, i);
+	err = __page_symlink(inode, symname, i);
 	if (unlikely(err)) {
 		inode_dec_link_count(inode);
 		iput(inode);
@@ -273,6 +370,44 @@ static int minix_rename(struct mnt_idmap *idmap,
 	return err;
 }
 
+/* straight up thievery here; stolen verbatim from ext4_get_link */
+static void minix_free_link(void *bh)
+{
+	brelse(bh);
+}
+
+/* Borrowing from ext4_get_link to a degree; since minix inodes and symlinks
+ * are significantly simpler, we don't need to do nearly as much as ext4
+ * requires for old-timey ext4 slow links.
+ */
+const char *minix_get_link(struct dentry *dentry, struct inode *inode,
+		struct delayed_call *callback)
+{
+	struct super_block *sb = inode->i_sb;
+	struct buffer_head *bh;
+	sector_t blk;
+
+	/* Get yon block, depending on what version of the minix fs this is. */
+	if (INODE_VERSION(inode) == MINIX_V1)
+		blk = v1_block_to_cpu(*(v1_i_data(inode)));
+	else
+		blk = v2_block_to_cpu(*(v2_i_data(inode)));
+
+	bh = sb_bread(sb, blk);
+	if (IS_ERR(bh))
+		return ERR_CAST(bh);
+	if (!bh) {
+		pr_err("bad symlink on inode %llu", inode->i_ino);
+		return ERR_PTR(-EFSCORRUPTED);
+	}
+
+	set_delayed_call(callback, minix_free_link, bh);
+	nd_terminate_link(bh->b_data, inode->i_size,
+			inode->i_sb->s_blocksize - 1);
+
+	return bh->b_data;
+}
+
 /*
  * directories can handle most operations...
  */

3/2 2026/06/28 05:33 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 11608
							output: 32
							thoughts: 447

Thoughts: 
**Minix I/O Implementation Patch Analysis & Fuzzing Strategy**

Okay, so I've got this patch here that's diving deep into the Minix filesystem implementation. It's touching `fs/minix/file.c`, `fs/minix/inode.c`, `fs/minix/iomap.c`, the `itree` implementation, and even the header and name resolution components. This is pretty significant; it's implementing iomap-based direct I/O and buffered I/O, which is a big change to how Minix handles data.

Looking at the code changes, it's introducing a whole slew of new functions: `minix_dio_read_iter`, `minix_dio_write_iter`, the standard file read/write iterators, and some crucial iomap lifecycle functions like `minix_iomap_begin` and `minix_iomap_end`. Plus, it looks like they've updated the writeback and read-ahead mechanisms (`minix_writeback_range`, `minix_writepages`, `minix_read_folio`, `minix_readahead`). I also see changes to block mapping (`minix_bmap`) and symlink handling, switching away from the generic page symlink functions and using `__page_symlink` and `minix_get_link` instead.

This is a clear functional shift. Given the complexity and the potential for subtle interactions in a filesystem, this definitely warrants some serious fuzzing. My main targets for fuzzing should be all the newly introduced functions: `minix_dio_read_iter`, `minix_dio_write_iter`, `minix_file_read_iter`, `minix_file_write_iter`, `minix_iomap_begin`, `minix_iomap_end`, `minix_writeback_range`, `minix_writepages`, `minix_read_folio`, `minix_readahead`, `minix_bmap`, `__page_symlink`, and `minix_get_link`. These are the critical entry points and data manipulation functions that need the most scrutiny.

Before I go any further, I'll quickly check `fs/minix/Kconfig` to confirm what config options are involved in enabling the Minix filesystem. I need to make sure I know how to actually enable this code path and which configs are relevant for the build.

4/2 2026/06/28 05:33 tool grepper
0m Args: 
{
  "Expression": "config MINIX_FS",
  "PathPrefix": "fs/minix/Kconfig"
}

Results: 
{
  "Output": "fs/minix/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\nfs/minix/Kconfig:2:config MINIX_FS\nfs/minix/Kconfig-3-\ttristate \"Minix file system support\"\n--\nfs/minix/Kconfig-20-\nfs/minix/Kconfig:21:config MINIX_FS_NATIVE_ENDIAN\nfs/minix/Kconfig-22-\tdef_bool MINIX_FS\n--\nfs/minix/Kconfig-24-\nfs/minix/Kconfig:25:config MINIX_FS_BIG_ENDIAN_16BIT_INDEXED\nfs/minix/Kconfig-26-\tdef_bool MINIX_FS\n"
}
5/2 2026/06/28 05:33 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 12812
							output: 55
							thoughts: 18

Thoughts: 
Okay, here's my take on those thoughts, framed as an expert's inner monologue:

**Checking My Assumptions: Config and Focus**

Alright, the context is the `MINIX_FS` config. Right away, my mind starts ticking. I need to make sure I'm grounded in the specifics of *that* particular configuration. Before I delve into anything else, it's essential to quickly verify that my understanding of the relevant focus symbols is accurate. I don't want to waste time down a rabbit hole based on an incorrect premise. Let's make sure I'm tracking with the right variables and definitions for `MINIX_FS`. This seems like a sanity check, more than anything else, but essential to ensure efficiency in the long run.

6/2 2026/06/28 05:33 tool grepper
0m Args: 
{
  "Expression": "^(static )?[a-zA-Z_0-9]+ \\**minix_[a-zA-Z_0-9]+\\(",
  "PathPrefix": "fs/minix/"
}

Results: 
{
  "Output": "fs/minix/bitmap.c=27=static __u32 count_free(struct buffer_head *map[], unsigned blocksize, __u32 numbits)\n--\nfs/minix/bitmap.c-41-\nfs/minix/bitmap.c:42:void minix_free_block(struct inode *inode, unsigned long block)\nfs/minix/bitmap.c-43-{\n--\nfs/minix/bitmap.c-70-\nfs/minix/bitmap.c:71:int minix_new_block(struct inode * inode)\nfs/minix/bitmap.c-72-{\n--\nfs/minix/bitmap.c=131=minix_V2_raw_inode(struct super_block *sb, ino_t ino, struct buffer_head **bh)\n--\nfs/minix/bitmap.c-157-\nfs/minix/bitmap.c:158:static void minix_clear_inode(struct inode *inode)\nfs/minix/bitmap.c-159-{\n--\nfs/minix/bitmap.c-182-\nfs/minix/bitmap.c:183:void minix_free_inode(struct inode * inode)\nfs/minix/bitmap.c-184-{\n--\nfs/minix/dir.c=18=typedef struct minix3_dir_entry minix3_dirent;\nfs/minix/dir.c-19-\nfs/minix/dir.c:20:static int minix_readdir(struct file *, struct dir_context *);\nfs/minix/dir.c-21-\n--\nfs/minix/dir.c=43=static void dir_commit_chunk(struct folio *folio, loff_t pos, unsigned len)\n--\nfs/minix/dir.c-56-\nfs/minix/dir.c:57:static int minix_handle_dirsync(struct inode *dir)\nfs/minix/dir.c-58-{\n--\nfs/minix/dir.c=78=static inline void *minix_next_entry(void *de, struct minix_sb_info *sbi)\n--\nfs/minix/dir.c-82-\nfs/minix/dir.c:83:static int minix_readdir(struct file *file, struct dir_context *ctx)\nfs/minix/dir.c-84-{\n--\nfs/minix/dir.c=137=static inline int namecompare(int len, int maxlen,\n--\nfs/minix/dir.c-153- */\nfs/minix/dir.c:154:minix_dirent *minix_find_entry(struct dentry *dentry, struct folio **foliop)\nfs/minix/dir.c-155-{\n--\nfs/minix/dir.c-198-\nfs/minix/dir.c:199:int minix_add_link(struct dentry *dentry, struct inode *inode)\nfs/minix/dir.c-200-{\n--\nfs/minix/dir.c-285-\nfs/minix/dir.c:286:int minix_delete_entry(struct minix_dir_entry *de, struct folio *folio)\nfs/minix/dir.c-287-{\n--\nfs/minix/dir.c-309-\nfs/minix/dir.c:310:int minix_make_empty(struct inode *inode, struct inode *dir)\nfs/minix/dir.c-311-{\n--\nfs/minix/dir.c-356- */\nfs/minix/dir.c:357:int minix_empty_dir(struct inode * inode)\nfs/minix/dir.c-358-{\n--\nfs/minix/dir.c-406-/* Releases the page */\nfs/minix/dir.c:407:int minix_set_link(struct minix_dir_entry *de, struct folio *folio,\nfs/minix/dir.c-408-\t\tstruct inode *inode)\n--\nfs/minix/dir.c=431=struct minix_dir_entry *minix_dotdot(struct inode *dir, struct folio **foliop)\n--\nfs/minix/dir.c-440-\nfs/minix/dir.c:441:ino_t minix_inode_by_name(struct dentry *dentry)\nfs/minix/dir.c-442-{\n--\nfs/minix/file.c-12-\nfs/minix/file.c:13:int minix_fsync(struct file *file, loff_t start, loff_t end, int datasync)\nfs/minix/file.c-14-{\n--\nfs/minix/file.c-19-\nfs/minix/file.c:20:static ssize_t minix_dio_read_iter(struct kiocb *iocb, struct iov_iter *to)\nfs/minix/file.c-21-{\n--\nfs/minix/file.c-33-\nfs/minix/file.c:34:static int minix_dio_write_end_io(struct kiocb *iocb, ssize_t size, int error,\nfs/minix/file.c-35-\t\tunsigned int flags)\n--\nfs/minix/file.c=51=static const struct iomap_dio_ops minix_dio_write_ops = {\n--\nfs/minix/file.c-54-\nfs/minix/file.c:55:static ssize_t minix_dio_write_iter(struct kiocb *iocb, struct iov_iter *from)\nfs/minix/file.c-56-{\n--\nfs/minix/file.c-114-\nfs/minix/file.c:115:static ssize_t minix_file_read_iter(struct kiocb *iocb, struct iov_iter *to)\nfs/minix/file.c-116-{\n--\nfs/minix/file.c-122-\nfs/minix/file.c:123:static ssize_t minix_file_write_iter(struct kiocb *iocb, struct iov_iter *from)\nfs/minix/file.c-124-{\n--\nfs/minix/file.c-155-\nfs/minix/file.c:156:static int minix_file_open(struct inode *inode, struct file *filp)\nfs/minix/file.c-157-{\n--\nfs/minix/file.c=167=const struct file_operations minix_file_operations = {\n--\nfs/minix/file.c-177-\nfs/minix/file.c:178:int minix_setattr(struct mnt_idmap *idmap, struct dentry *dentry,\nfs/minix/file.c-179-\tstruct iattr *attr)\n--\nfs/minix/inode.c-24-\nfs/minix/inode.c:25:static int minix_write_inode(struct inode *inode,\nfs/minix/inode.c-26-\t\tstruct writeback_control *wbc);\nfs/minix/inode.c:27:static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);\nfs/minix/inode.c-28-\nfs/minix/inode.c=29=void __minix_error_inode(struct inode *inode, const char *function,\n--\nfs/minix/inode.c-44-\nfs/minix/inode.c:45:static void minix_evict_inode(struct inode *inode)\nfs/minix/inode.c-46-{\n--\nfs/minix/inode.c-59-\nfs/minix/inode.c:60:static void minix_put_super(struct super_block *sb)\nfs/minix/inode.c-61-{\n--\nfs/minix/inode.c=82=static struct inode *minix_alloc_inode(struct super_block *sb)\n--\nfs/minix/inode.c-92-\nfs/minix/inode.c:93:static void minix_free_in_core_inode(struct inode *inode)\nfs/minix/inode.c-94-{\n--\nfs/minix/inode.c=127=static const struct super_operations minix_sops = {\n--\nfs/minix/inode.c-135-\nfs/minix/inode.c:136:static int minix_reconfigure(struct fs_context *fc)\nfs/minix/inode.c-137-{\n--\nfs/minix/inode.c-173-\nfs/minix/inode.c:174:static bool minix_check_superblock(struct super_block *sb)\nfs/minix/inode.c-175-{\n--\nfs/minix/inode.c-220-\nfs/minix/inode.c:221:static int minix_fill_super(struct super_block *s, struct fs_context *fc)\nfs/minix/inode.c-222-{\n--\nfs/minix/inode.c-403-\nfs/minix/inode.c:404:static int minix_get_tree(struct fs_context *fc)\nfs/minix/inode.c-405-{\n--\nfs/minix/inode.c=409=static const struct fs_context_operations minix_context_ops = {\n--\nfs/minix/inode.c-413-\nfs/minix/inode.c:414:static int minix_init_fs_context(struct fs_context *fc)\nfs/minix/inode.c-415-{\n--\nfs/minix/inode.c-420-\nfs/minix/inode.c:421:static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)\nfs/minix/inode.c-422-{\n--\nfs/minix/inode.c-438-\nfs/minix/inode.c:439:static ssize_t minix_writeback_range(struct iomap_writepage_ctx *wpc,\nfs/minix/inode.c-440-\tstruct folio *folio, u64 pos, unsigned int len, u64 end_pos)\n--\nfs/minix/inode.c=459=static const struct iomap_writeback_ops minix_writeback_ops = {\n--\nfs/minix/inode.c-463-\nfs/minix/inode.c:464:int minix_get_block(struct inode *inode, sector_t block,\nfs/minix/inode.c-465-\t\t    struct buffer_head *bh_result, int create)\n--\nfs/minix/inode.c-473-/* The old minix_writepages, preserved for directory operations. */\nfs/minix/inode.c:474:static int minix_block_writepages(struct address_space *mapping,\nfs/minix/inode.c-475-\t\tstruct writeback_control *wbc)\n--\nfs/minix/inode.c-479-\nfs/minix/inode.c:480:static int minix_writepages(struct address_space *mapping,\nfs/minix/inode.c-481-\t\tstruct writeback_control *wbc)\n--\nfs/minix/inode.c-490-\nfs/minix/inode.c:491:static int minix_read_folio(struct file *file, struct folio *folio)\nfs/minix/inode.c-492-{\n--\nfs/minix/inode.c-499-/* The old minix_read_folio, preserved for directory operations. */\nfs/minix/inode.c:500:static int minix_block_read_folio(struct file *file, struct folio *folio)\nfs/minix/inode.c-501-{\n--\nfs/minix/inode.c-504-\nfs/minix/inode.c:505:static void minix_readahead(struct readahead_control *rac)\nfs/minix/inode.c-506-{\n--\nfs/minix/inode.c-511-\nfs/minix/inode.c:512:int minix_prepare_chunk(struct folio *folio, loff_t pos, unsigned len)\nfs/minix/inode.c-513-{\n--\nfs/minix/inode.c-516-\nfs/minix/inode.c:517:static void minix_write_failed(struct address_space *mapping, loff_t to)\nfs/minix/inode.c-518-{\n--\nfs/minix/inode.c-526-\nfs/minix/inode.c:527:static int minix_write_begin(const struct kiocb *iocb,\nfs/minix/inode.c-528-\t\t\t     struct address_space *mapping,\n--\nfs/minix/inode.c-540-\nfs/minix/inode.c:541:static sector_t minix_bmap(struct address_space *mapping, sector_t block)\nfs/minix/inode.c-542-{\n--\nfs/minix/inode.c=575=static const struct inode_operations minix_symlink_inode_operations = {\n--\nfs/minix/inode.c-580-\nfs/minix/inode.c:581:void minix_set_inode(struct inode *inode, dev_t rdev)\nfs/minix/inode.c-582-{\n--\nfs/minix/inode.c=731=static struct buffer_head * V2_minix_update_inode(struct inode * inode)\n--\nfs/minix/inode.c-756-\nfs/minix/inode.c:757:static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)\nfs/minix/inode.c-758-{\n--\nfs/minix/inode.c-779-\nfs/minix/inode.c:780:int minix_getattr(struct mnt_idmap *idmap, const struct path *path,\nfs/minix/inode.c-781-\t\t  struct kstat *stat, u32 request_mask, unsigned int flags)\n--\nfs/minix/inode.c-797- */\nfs/minix/inode.c:798:void minix_truncate(struct inode * inode)\nfs/minix/inode.c-799-{\n--\nfs/minix/iomap.c-14- */\nfs/minix/iomap.c:15:static int minix_iomap_begin(struct inode *inode, loff_t offset, loff_t length,\nfs/minix/iomap.c-16-\tunsigned int flags, struct iomap *iomap, struct iomap *srcmap)\n--\nfs/minix/iomap.c-109- */\nfs/minix/iomap.c:110:static int minix_iomap_end(struct inode *inode, loff_t offset, loff_t length,\nfs/minix/iomap.c-111-\tssize_t written, unsigned int flags, struct iomap *iomap)\n--\nfs/minix/minix.h=53=struct inode *minix_new_inode(const struct inode *, umode_t);\nfs/minix/minix.h:54:void minix_free_inode(struct inode *inode);\nfs/minix/minix.h-55-unsigned long minix_count_free_inodes(struct super_block *sb);\nfs/minix/minix.h:56:int minix_new_block(struct inode *inode);\nfs/minix/minix.h:57:void minix_free_block(struct inode *inode, unsigned long block);\nfs/minix/minix.h-58-unsigned long minix_count_free_blocks(struct super_block *sb);\nfs/minix/minix.h:59:int minix_getattr(struct mnt_idmap *, const struct path *,\nfs/minix/minix.h-60-\t\tstruct kstat *, u32, unsigned);\nfs/minix/minix.h:61:int minix_setattr(struct mnt_idmap *idmap, struct dentry *dentry,\nfs/minix/minix.h-62-\tstruct iattr *attr);\nfs/minix/minix.h:63:int minix_prepare_chunk(struct folio *folio, loff_t pos, unsigned len);\nfs/minix/minix.h-64-struct mapping_metadata_bhs *minix_get_metadata_bhs(struct inode *inode);\nfs/minix/minix.h:65:int minix_fsync(struct file *file, loff_t start, loff_t end, int datasync);\nfs/minix/minix.h-66-\n--\nfs/minix/minix.h=78=struct minix_dir_entry *minix_find_entry(struct dentry *, struct folio **);\nfs/minix/minix.h:79:int minix_add_link(struct dentry*, struct inode*);\nfs/minix/minix.h:80:int minix_delete_entry(struct minix_dir_entry *, struct folio *);\nfs/minix/minix.h:81:int minix_make_empty(struct inode*, struct inode*);\nfs/minix/minix.h:82:int minix_empty_dir(struct inode*);\nfs/minix/minix.h:83:int minix_set_link(struct minix_dir_entry *de, struct folio *folio,\nfs/minix/minix.h-84-\t\tstruct inode *inode);\n--\nfs/minix/minix.h=88=struct minix_dir_entry *minix_dotdot(struct inode*, struct folio **);\nfs/minix/minix.h:89:ino_t minix_inode_by_name(struct dentry*);\nfs/minix/minix.h-90-\n--\nfs/minix/namei.c=24=static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)\n--\nfs/minix/namei.c-37-\nfs/minix/namei.c:38:static int minix_mknod(struct mnt_idmap *idmap, struct inode *dir,\nfs/minix/namei.c-39-\t\t       struct dentry *dentry, umode_t mode, dev_t rdev)\n--\nfs/minix/namei.c-54-\nfs/minix/namei.c:55:static int minix_tmpfile(struct mnt_idmap *idmap, struct inode *dir,\nfs/minix/namei.c-56-\t\t\t struct file *file, umode_t mode)\n--\nfs/minix/namei.c-67-\nfs/minix/namei.c:68:static int minix_create(struct mnt_idmap *idmap, struct inode *dir,\nfs/minix/namei.c-69-\t\t\tstruct dentry *dentry, umode_t mode, bool excl)\n--\nfs/minix/namei.c=109=static int __page_symlink(struct inode *inode, const char *symname, int len)\n--\nfs/minix/namei.c-168-\nfs/minix/namei.c:169:static int minix_symlink(struct mnt_idmap *idmap, struct inode *dir,\nfs/minix/namei.c-170-\t\t\t struct dentry *dentry, const char *symname)\n--\nfs/minix/namei.c-192-\nfs/minix/namei.c:193:static int minix_link(struct dentry * old_dentry, struct inode * dir,\nfs/minix/namei.c-194-\tstruct dentry *dentry)\n--\nfs/minix/namei.c=204=static struct dentry *minix_mkdir(struct mnt_idmap *idmap, struct inode *dir,\n--\nfs/minix/namei.c-237-\nfs/minix/namei.c:238:static int minix_unlink(struct inode * dir, struct dentry *dentry)\nfs/minix/namei.c-239-{\n--\nfs/minix/namei.c-262-\nfs/minix/namei.c:263:static int minix_rmdir(struct inode * dir, struct dentry *dentry)\nfs/minix/namei.c-264-{\n--\nfs/minix/namei.c-286-\nfs/minix/namei.c:287:static int minix_rename(struct mnt_idmap *idmap,\nfs/minix/namei.c-288-\t\t\tstruct inode *old_dir, struct dentry *old_dentry,\n--\nfs/minix/namei.c-373-/* straight up thievery here; stolen verbatim from ext4_get_link */\nfs/minix/namei.c:374:static void minix_free_link(void *bh)\nfs/minix/namei.c-375-{\n"
}
7/2 2026/06/28 05:33 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 18519
							output: 261
							thoughts: 1132

Thoughts: 
**Refining the MINIX Filesystem Symbol List**

Okay, let's get down to brass tacks. I need to make sure I've got the relevant symbols nailed down for this MINIX filesystem patch. My initial list includes: `minix_dio_read_iter`, `minix_dio_write_iter`, `minix_dio_write_end_io`, `minix_file_read_iter`, `minix_file_write_iter`, `minix_iomap_begin`, `minix_iomap_end`, `minix_writeback_range`, `minix_writepages`, `minix_read_folio`, `minix_readahead`, `minix_bmap`, `__page_symlink`, `minix_get_link`, and `minix_free_link`.

First, I need to verify whether `minix_iomap_begin` and `minix_iomap_end` are exported or static. Turns out they are static within `fs/minix/iomap.c`, which is included in `itree_v1.c` and `itree_v2.c`.  Aha! That means `V1_minix_iomap_begin` and `V2_minix_iomap_begin` are the exported versions; I need to add them to the list, which will give: `V1_minix_iomap_begin` and `V2_minix_iomap_begin`.

Next, I'll go through the others to confirm:
*   `minix_writeback_range` and `minix_writepages` are static in `fs/minix/inode.c`.
*   `minix_read_folio` and `minix_readahead` are static in `fs/minix/inode.c`.
*   `minix_bmap` is static in `fs/minix/inode.c`.
*   `__page_symlink` is static in `fs/minix/namei.c`.
*   `minix_get_link` is exported in `fs/minix/namei.c`.
*   `minix_free_link` is static in `fs/minix/namei.c`.
*   `minix_dio_read_iter`, `minix_dio_write_iter`, `minix_dio_write_end_io`, `minix_file_read_iter`, and `minix_file_write_iter` are all static in `fs/minix/file.c`.

With all this information, I can now refine my list:

*   `minix_dio_read_iter`
*   `minix_dio_write_iter`
*   `minix_dio_write_end_io`
*   `minix_file_read_iter`
*   `minix_file_write_iter`
*   `minix_iomap_begin`
*   `minix_iomap_end`
*   `V1_minix_iomap_begin`
*   `V2_minix_iomap_begin`
*   `minix_writeback_range`
*   `minix_writepages`
*   `minix_read_folio`
*   `minix_readahead`
*   `minix_bmap`
*   `__page_symlink`
*   `minix_get_link`
*   `minix_free_link`

The configuration is clearly `MINIX_FS`, which is the correct symbol.

The rationale is this patch is a functional change to the MINIX filesystem, adding iomap-based direct I/O and buffered I/O. This means changes to the core read/write paths, block mapping, and symlink handling, so the identified symbols are central to this. I've now got a good set of symbols to check.  Time to call set-results.

8/2 2026/06/28 05:33 tool set-results
0m Args: 
{
  "EnableConfigs": [
    "MINIX_FS"
  ],
  "FocusSymbols": [
    "minix_dio_read_iter",
    "minix_dio_write_iter",
    "minix_dio_write_end_io",
    "minix_file_read_iter",
    "minix_file_write_iter",
    "minix_iomap_begin",
    "minix_iomap_end",
    "V1_minix_iomap_begin",
    "V2_minix_iomap_begin",
    "minix_writeback_range",
    "minix_writepages",
    "minix_read_folio",
    "minix_readahead",
    "minix_bmap",
    "__page_symlink",
    "minix_get_link",
    "minix_free_link"
  ],
  "Reasoning": "The patch implements iomap-based direct I/O and buffered I/O for the minix filesystem, which is a functional change to the core filesystem logic. It modifies read/write paths, block mapping, and symlink handling.",
  "WorthFuzzing": true
}

Results: 
{
  "EnableConfigs": [
    "MINIX_FS"
  ],
  "FocusSymbols": [
    "minix_dio_read_iter",
    "minix_dio_write_iter",
    "minix_dio_write_end_io",
    "minix_file_read_iter",
    "minix_file_write_iter",
    "minix_iomap_begin",
    "minix_iomap_end",
    "V1_minix_iomap_begin",
    "V2_minix_iomap_begin",
    "minix_writeback_range",
    "minix_writepages",
    "minix_read_folio",
    "minix_readahead",
    "minix_bmap",
    "__page_symlink",
    "minix_get_link",
    "minix_free_link"
  ],
  "Reasoning": "The patch implements iomap-based direct I/O and buffered I/O for the minix filesystem, which is a functional change to the core filesystem logic. It modifies read/write paths, block mapping, and symlink handling.",
  "WorthFuzzing": true
}
LLM Calls Summary:
Total Calls Total Tokens Avg Tokens Total Duration (Seconds) Avg Duration (Seconds)
Tool Calls Summary:
Total Calls Total Duration (Seconds) Avg Duration (Seconds)