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Signed-off-by: Matthew Bobrowski --- fs/ext4/ext4.h | 1 + fs/ext4/file.c | 6 ++- fs/ext4/inode.c | 129 ++++++++++++++++++++++++++++-------------------- 3 files changed, 80 insertions(+), 56 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 03db3e71676c..d0d88f411a44 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -3379,6 +3379,7 @@ static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) } extern const struct iomap_ops ext4_iomap_ops; +extern const struct iomap_ops ext4_iomap_report_ops; static inline int ext4_buffer_uptodate(struct buffer_head *bh) { diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 8d2bbcc2d813..ab75aee3e687 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -494,12 +494,14 @@ loff_t ext4_llseek(struct file *file, loff_t offset, int whence) maxbytes, i_size_read(inode)); case SEEK_HOLE: inode_lock_shared(inode); - offset = iomap_seek_hole(inode, offset, &ext4_iomap_ops); + offset = iomap_seek_hole(inode, offset, + &ext4_iomap_report_ops); inode_unlock_shared(inode); break; case SEEK_DATA: inode_lock_shared(inode); - offset = iomap_seek_data(inode, offset, &ext4_iomap_ops); + offset = iomap_seek_data(inode, offset, + &ext4_iomap_report_ops); inode_unlock_shared(inode); break; } diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index caeb3dec0dec..1dace576b8bd 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -3439,6 +3439,72 @@ static int ext4_set_iomap(struct inode *inode, struct iomap *iomap, u16 type, return 0; } +static u16 ext4_iomap_check_delalloc(struct inode *inode, + struct ext4_map_blocks *map) +{ + struct extent_status es; + ext4_lblk_t end = map->m_lblk + map->m_len - 1; + + ext4_es_find_extent_range(inode, &ext4_es_is_delayed, map->m_lblk, + end, &es); + + /* Entire range is a hole */ + if (!es.es_len || es.es_lblk > end) + return IOMAP_HOLE; + if (es.es_lblk <= map->m_lblk) { + ext4_lblk_t offset = 0; + + if (es.es_lblk < map->m_lblk) + offset = map->m_lblk - es.es_lblk; + map->m_lblk = es.es_lblk + offset; + map->m_len = es.es_len - offset; + return IOMAP_DELALLOC; + } + + /* Range starts with a hole */ + map->m_len = es.es_lblk - map->m_lblk; + return IOMAP_HOLE; +} + +static int ext4_iomap_begin_report(struct inode *inode, loff_t offset, + loff_t length, unsigned flags, + struct iomap *iomap) +{ + int ret; + u16 type = 0; + struct ext4_map_blocks map; + u8 blkbits = inode->i_blkbits; + unsigned long first_block, last_block; + + if ((offset >> blkbits) > EXT4_MAX_LOGICAL_BLOCK) + return -EINVAL; + first_block = offset >> blkbits; + last_block = min_t(loff_t, (offset + length - 1) >> blkbits, + EXT4_MAX_LOGICAL_BLOCK); + + if (ext4_has_inline_data(inode)) { + ret = ext4_inline_data_iomap(inode, iomap); + if (ret != -EAGAIN) { + if (ret == 0 && offset >= iomap->length) + ret = -ENOENT; + return ret; + } + } + + map.m_lblk = first_block; + map.m_len = last_block = first_block + 1; + ret = ext4_map_blocks(NULL, inode, &map, 0); + if (ret < 0) + return ret; + if (ret == 0) + type = ext4_iomap_check_delalloc(inode, &map); + return ext4_set_iomap(inode, iomap, type, first_block, &map); +} + +const struct iomap_ops ext4_iomap_report_ops = { + .iomap_begin = ext4_iomap_begin_report, +}; + static int ext4_iomap_alloc(struct inode *inode, unsigned flags, unsigned long first_block, @@ -3498,12 +3564,10 @@ static int ext4_iomap_alloc(struct inode *inode, static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length, unsigned flags, struct iomap *iomap) { - u16 type = 0; - unsigned int blkbits = inode->i_blkbits; - unsigned long first_block, last_block; - struct ext4_map_blocks map; - bool delalloc = false; int ret; + struct ext4_map_blocks map; + u8 blkbits = inode->i_blkbits; + unsigned long first_block, last_block; if ((offset >> blkbits) > EXT4_MAX_LOGICAL_BLOCK) return -EINVAL; @@ -3511,64 +3575,21 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length, last_block = min_t(loff_t, (offset + length - 1) >> blkbits, EXT4_MAX_LOGICAL_BLOCK); - if (flags & IOMAP_REPORT) { - if (ext4_has_inline_data(inode)) { - ret = ext4_inline_data_iomap(inode, iomap); - if (ret != -EAGAIN) { - if (ret == 0 && offset >= iomap->length) - ret = -ENOENT; - return ret; - } - } - } else { - if (WARN_ON_ONCE(ext4_has_inline_data(inode))) - return -ERANGE; - } + if (WARN_ON_ONCE(ext4_has_inline_data(inode))) + return -ERANGE; map.m_lblk = first_block; map.m_len = last_block - first_block + 1; - if (flags & IOMAP_REPORT) { - ret = ext4_map_blocks(NULL, inode, &map, 0); - if (ret < 0) - return ret; - - if (ret == 0) { - ext4_lblk_t end = map.m_lblk + map.m_len - 1; - struct extent_status es; - - ext4_es_find_extent_range(inode, &ext4_es_is_delayed, - map.m_lblk, end, &es); - - if (!es.es_len || es.es_lblk > end) { - /* entire range is a hole */ - } else if (es.es_lblk > map.m_lblk) { - /* range starts with a hole */ - map.m_len = es.es_lblk - map.m_lblk; - } else { - ext4_lblk_t offs = 0; - - if (es.es_lblk < map.m_lblk) - offs = map.m_lblk - es.es_lblk; - map.m_lblk = es.es_lblk + offs; - map.m_len = es.es_len - offs; - delalloc = true; - } - } - } else if (flags & IOMAP_WRITE) { + if (flags & IOMAP_WRITE) ret = ext4_iomap_alloc(inode, flags, first_block, &map); - } else { + else ret = ext4_map_blocks(NULL, inode, &map, 0); - if (ret < 0) - return ret; - } if (ret < 0) return ret; - - if (!ret) - type = delalloc ? IOMAP_DELALLOC : IOMAP_HOLE; - return ext4_set_iomap(inode, iomap, type, first_block, &map); + return ext4_set_iomap(inode, iomap, ret ? 0 : IOMAP_HOLE, first_block, + &map); } static int ext4_iomap_end(struct inode *inode, loff_t offset, loff_t length, -- 2.20.1