mainline inclusion from mainline-v6.8-rc3 commit 874eaba96d39334fe9c729ff631e65523616d4d8 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I9DN5Z CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Add a new map flag EXT4_MAP_DELAYED to indicate the mapping range is a delayed allocated only (not unwritten) one, and making ext4_map_blocks() can distinguish it, no longer mixing it with holes.
Signed-off-by: Zhang Yi yi.zhang@huawei.com Reviewed-by: Jan Kara jack@suse.cz Link: https://lore.kernel.org/r/20240127015825.1608160-6-yi.zhang@huaweicloud.com Signed-off-by: Theodore Ts'o tytso@mit.edu --- fs/ext4/ext4.h | 4 +++- fs/ext4/extents.c | 7 +++++-- fs/ext4/inode.c | 2 ++ 3 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index a87cdb53198f..a12a9191a02e 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -263,8 +263,10 @@ struct ext4_allocation_request { #define EXT4_MAP_MAPPED BIT(BH_Mapped) #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) +#define EXT4_MAP_DELAYED BIT(BH_Delay) #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ - EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) + EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ + EXT4_MAP_DELAYED)
struct ext4_map_blocks { ext4_fsblk_t m_pblk; diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index eb9e88e5a93b..ed65ae462210 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4087,8 +4087,11 @@ static ext4_lblk_t ext4_ext_determine_insert_hole(struct inode *inode, /* * The delalloc extent containing lblk, it must have been * added after ext4_map_blocks() checked the extent status - * tree, adjust the length to the delalloc extent's after - * lblk. + * tree so we are not holding i_rwsem and delalloc info is + * only stabilized by i_data_sem we are going to release + * soon. Don't modify the extent status tree and report + * extent as a hole, just adjust the length to the delalloc + * extent's after lblk. */ len = es.es_lblk + es.es_len - lblk; return len; diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index f78ccae23c1b..6e230d31fd87 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -515,6 +515,8 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode, map->m_len = retval; } else if (ext4_es_is_delayed(&es) || ext4_es_is_hole(&es)) { map->m_pblk = 0; + map->m_flags |= ext4_es_is_delayed(&es) ? + EXT4_MAP_DELAYED : 0; retval = es.es_len - (map->m_lblk - es.es_lblk); if (retval > map->m_len) retval = map->m_len;