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ext4: move set iomap routines into a separate helper ext4_set_iomap()

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Separate the iomap field population code that is currently within
ext4_iomap_begin() into a separate helper ext4_set_iomap(). The intent
of this function is self explanatory, however the rationale behind
taking this step is to reeduce the overall clutter that we currently
have within the ext4_iomap_begin() callback.

Signed-off-by: Matthew Bobrowski <mbobrowski@mbobrowski.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>
Link: https://lore.kernel.org/r/1ea34da65eecffcddffb2386668ae06134e8deaf.1572949325.git.mbobrowski@mbobrowski.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Matthew Bobrowski 2019-11-05 22:59:56 +11:00 committed by Theodore Ts'o
parent 2e9b51d782
commit c8fdfe2941
1 changed files with 48 additions and 42 deletions
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90
fs/ext4/inode.c
View file

@ -3448,10 +3448,54 @@ static bool ext4_inode_datasync_dirty(struct inode *inode)
return inode->i_state & I_DIRTY_DATASYNC;
}
static void ext4_set_iomap(struct inode *inode, struct iomap *iomap,
struct ext4_map_blocks *map, loff_t offset,
loff_t length)
{
u8 blkbits = inode->i_blkbits;
/*
* Writes that span EOF might trigger an I/O size update on completion,
* so consider them to be dirty for the purpose of O_DSYNC, even if
* there is no other metadata changes being made or are pending.
*/
iomap->flags = 0;
if (ext4_inode_datasync_dirty(inode) ||
offset + length > i_size_read(inode))
iomap->flags |= IOMAP_F_DIRTY;
if (map->m_flags & EXT4_MAP_NEW)
iomap->flags |= IOMAP_F_NEW;
iomap->bdev = inode->i_sb->s_bdev;
iomap->dax_dev = EXT4_SB(inode->i_sb)->s_daxdev;
iomap->offset = (u64) map->m_lblk << blkbits;
iomap->length = (u64) map->m_len << blkbits;
/*
* Flags passed to ext4_map_blocks() for direct I/O writes can result
* in m_flags having both EXT4_MAP_MAPPED and EXT4_MAP_UNWRITTEN bits
* set. In order for any allocated unwritten extents to be converted
* into written extents correctly within the ->end_io() handler, we
* need to ensure that the iomap->type is set appropriately. Hence, the
* reason why we need to check whether the EXT4_MAP_UNWRITTEN bit has
* been set first.
*/
if (map->m_flags & EXT4_MAP_UNWRITTEN) {
iomap->type = IOMAP_UNWRITTEN;
iomap->addr = (u64) map->m_pblk << blkbits;
} else if (map->m_flags & EXT4_MAP_MAPPED) {
iomap->type = IOMAP_MAPPED;
iomap->addr = (u64) map->m_pblk << blkbits;
} else {
iomap->type = IOMAP_HOLE;
iomap->addr = IOMAP_NULL_ADDR;
}
}
static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
unsigned flags, struct iomap *iomap, struct iomap *srcmap)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
unsigned int blkbits = inode->i_blkbits;
unsigned long first_block, last_block;
struct ext4_map_blocks map;
@ -3565,47 +3609,9 @@ retry:
return ret;
}
/*
* Writes that span EOF might trigger an I/O size update on completion,
* so consider them to be dirty for the purposes of O_DSYNC, even if
* there is no other metadata changes being made or are pending here.
*/
iomap->flags = 0;
if (ext4_inode_datasync_dirty(inode) ||
offset + length > i_size_read(inode))
iomap->flags |= IOMAP_F_DIRTY;
iomap->bdev = inode->i_sb->s_bdev;
iomap->dax_dev = sbi->s_daxdev;
iomap->offset = (u64)first_block << blkbits;
iomap->length = (u64)map.m_len << blkbits;
if (ret == 0) {
iomap->type = delalloc ? IOMAP_DELALLOC : IOMAP_HOLE;
iomap->addr = IOMAP_NULL_ADDR;
} else {
/*
* Flags passed into ext4_map_blocks() for direct I/O writes
* can result in m_flags having both EXT4_MAP_MAPPED and
* EXT4_MAP_UNWRITTEN bits set. In order for any allocated
* unwritten extents to be converted into written extents
* correctly within the ->end_io() handler, we need to ensure
* that the iomap->type is set appropriately. Hence the reason
* why we need to check whether EXT4_MAP_UNWRITTEN is set
* first.
*/
if (map.m_flags & EXT4_MAP_UNWRITTEN) {
iomap->type = IOMAP_UNWRITTEN;
} else if (map.m_flags & EXT4_MAP_MAPPED) {
iomap->type = IOMAP_MAPPED;
} else {
WARN_ON_ONCE(1);
return -EIO;
}
iomap->addr = (u64)map.m_pblk << blkbits;
}
if (map.m_flags & EXT4_MAP_NEW)
iomap->flags |= IOMAP_F_NEW;
ext4_set_iomap(inode, iomap, &map, offset, length);
if (delalloc && iomap->type == IOMAP_HOLE)
iomap->type = IOMAP_DELALLOC;
return 0;
}