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ext4: add iomap address space operations for buffered I/O

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Introduce initial support for iomap in the buffered I/O path for regular
files on ext4.

  - Add a new inode state flag EXT4_STATE_BUFFERED_IOMAP to indicate the
    inode uses iomap instead of buffer_head for buffered I/O
  - Add helper ext4_inode_buffered_iomap() to check the flag
  - Add new address space operations ext4_iomap_aops with callbacks that
    will use generic iomap implementations
  - Add ext4_iomap_aops to ext4_set_aops() when the flag is set

The following callbacks(read_folio(), readahead(), writepages()) are
provided as placeholders and will be implemented in later patches.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Tested-by: syzbot@syzkaller.appspotmail.com
Link: https://patch.msgid.link/20261009103033.2920530-10-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Zhang Yi 2026-10-09 18:30:10 +08:00 committed by Theodore Ts'o
parent 244392197b
commit a304299a40
2 changed files with 39 additions and 0 deletions
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7
fs/ext4/ext4.h
View File

@ -2049,6 +2049,7 @@ enum {
EXT4_STATE_FC_FLUSHING_DATA, /* Fast commit flushing data */
EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */
EXT4_STATE_FC_REQUEUE, /* Inode modified during fast commit */
EXT4_STATE_BUFFERED_IOMAP, /* Inode use iomap for buffered IO */
};
#define EXT4_INODE_BIT_FNS(name, field, offset) \
@ -2148,6 +2149,12 @@ static inline struct mapping_metadata_bhs *ext4_i_metadata_bhs(
return READ_ONCE(EXT4_I(inode)->i_metadata_bhs);
}
/* Whether the inode pass through the iomap infrastructure for buffered I/O */
static inline bool ext4_inode_buffered_iomap(struct inode *inode)
{
return ext4_test_inode_state(inode, EXT4_STATE_BUFFERED_IOMAP);
}
/*
* Codes for operating systems
*/

32
fs/ext4/inode.c
View File

@ -3969,6 +3969,22 @@ const struct iomap_ops ext4_iomap_report_ops = {
.iomap_next = ext4_iomap_next_report,
};
static int ext4_iomap_read_folio(struct file *file, struct folio *folio)
{
return 0;
}
static void ext4_iomap_readahead(struct readahead_control *rac)
{
}
static int ext4_iomap_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
return 0;
}
/*
* For data=journal mode, folio should be marked dirty only when it was
* writeably mapped. When that happens, it was already attached to the
@ -4055,6 +4071,20 @@ static const struct address_space_operations ext4_da_aops = {
.swap_activate = ext4_iomap_swap_activate,
};
static const struct address_space_operations ext4_iomap_aops = {
.read_folio = ext4_iomap_read_folio,
.readahead = ext4_iomap_readahead,
.writepages = ext4_iomap_writepages,
.dirty_folio = iomap_dirty_folio,
.bmap = ext4_bmap,
.invalidate_folio = iomap_invalidate_folio,
.release_folio = iomap_release_folio,
.migrate_folio = filemap_migrate_folio,
.is_partially_uptodate = iomap_is_partially_uptodate,
.error_remove_folio = generic_error_remove_folio,
.swap_activate = ext4_iomap_swap_activate,
};
static const struct address_space_operations ext4_dax_aops = {
.writepages = ext4_dax_writepages,
.dirty_folio = noop_dirty_folio,
@ -4076,6 +4106,8 @@ void ext4_set_aops(struct inode *inode)
}
if (IS_DAX(inode))
inode->i_mapping->a_ops = &ext4_dax_aops;
else if (ext4_inode_buffered_iomap(inode))
inode->i_mapping->a_ops = &ext4_iomap_aops;
else if (test_opt(inode->i_sb, DELALLOC))
inode->i_mapping->a_ops = &ext4_da_aops;
else