diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c index 1c2ece961128..15a4c7c07a3b 100644 --- a/fs/zonefs/super.c +++ b/fs/zonefs/super.c @@ -72,15 +72,51 @@ static inline void zonefs_i_size_write(struct inode *inode, loff_t isize) zi->i_flags &= ~ZONEFS_ZONE_OPEN; } -static int zonefs_iomap_begin(struct inode *inode, loff_t offset, loff_t length, - unsigned int flags, struct iomap *iomap, - struct iomap *srcmap) +static int zonefs_read_iomap_begin(struct inode *inode, loff_t offset, + loff_t length, unsigned int flags, + struct iomap *iomap, struct iomap *srcmap) { struct zonefs_inode_info *zi = ZONEFS_I(inode); struct super_block *sb = inode->i_sb; loff_t isize; - /* All I/Os should always be within the file maximum size */ + /* + * All blocks are always mapped below EOF. If reading past EOF, + * act as if there is a hole up to the file maximum size. + */ + mutex_lock(&zi->i_truncate_mutex); + iomap->bdev = inode->i_sb->s_bdev; + iomap->offset = ALIGN_DOWN(offset, sb->s_blocksize); + isize = i_size_read(inode); + if (iomap->offset >= isize) { + iomap->type = IOMAP_HOLE; + iomap->addr = IOMAP_NULL_ADDR; + iomap->length = length; + } else { + iomap->type = IOMAP_MAPPED; + iomap->addr = (zi->i_zsector << SECTOR_SHIFT) + iomap->offset; + iomap->length = isize - iomap->offset; + } + mutex_unlock(&zi->i_truncate_mutex); + + trace_zonefs_iomap_begin(inode, iomap); + + return 0; +} + +static const struct iomap_ops zonefs_read_iomap_ops = { + .iomap_begin = zonefs_read_iomap_begin, +}; + +static int zonefs_write_iomap_begin(struct inode *inode, loff_t offset, + loff_t length, unsigned int flags, + struct iomap *iomap, struct iomap *srcmap) +{ + struct zonefs_inode_info *zi = ZONEFS_I(inode); + struct super_block *sb = inode->i_sb; + loff_t isize; + + /* All write I/Os should always be within the file maximum size */ if (WARN_ON_ONCE(offset + length > zi->i_max_size)) return -EIO; @@ -90,7 +126,7 @@ static int zonefs_iomap_begin(struct inode *inode, loff_t offset, loff_t length, * operation. */ if (WARN_ON_ONCE(zi->i_ztype == ZONEFS_ZTYPE_SEQ && - (flags & IOMAP_WRITE) && !(flags & IOMAP_DIRECT))) + !(flags & IOMAP_DIRECT))) return -EIO; /* @@ -99,47 +135,44 @@ static int zonefs_iomap_begin(struct inode *inode, loff_t offset, loff_t length, * write pointer) and unwriten beyond. */ mutex_lock(&zi->i_truncate_mutex); - isize = i_size_read(inode); - if (offset >= isize) - iomap->type = IOMAP_UNWRITTEN; - else - iomap->type = IOMAP_MAPPED; - if (flags & IOMAP_WRITE) - length = zi->i_max_size - offset; - else - length = min(length, isize - offset); - mutex_unlock(&zi->i_truncate_mutex); - - iomap->offset = ALIGN_DOWN(offset, sb->s_blocksize); - iomap->length = ALIGN(offset + length, sb->s_blocksize) - iomap->offset; iomap->bdev = inode->i_sb->s_bdev; + iomap->offset = ALIGN_DOWN(offset, sb->s_blocksize); iomap->addr = (zi->i_zsector << SECTOR_SHIFT) + iomap->offset; + isize = i_size_read(inode); + if (iomap->offset >= isize) { + iomap->type = IOMAP_UNWRITTEN; + iomap->length = zi->i_max_size - iomap->offset; + } else { + iomap->type = IOMAP_MAPPED; + iomap->length = isize - iomap->offset; + } + mutex_unlock(&zi->i_truncate_mutex); trace_zonefs_iomap_begin(inode, iomap); return 0; } -static const struct iomap_ops zonefs_iomap_ops = { - .iomap_begin = zonefs_iomap_begin, +static const struct iomap_ops zonefs_write_iomap_ops = { + .iomap_begin = zonefs_write_iomap_begin, }; static int zonefs_readpage(struct file *unused, struct page *page) { - return iomap_readpage(page, &zonefs_iomap_ops); + return iomap_readpage(page, &zonefs_read_iomap_ops); } static void zonefs_readahead(struct readahead_control *rac) { - iomap_readahead(rac, &zonefs_iomap_ops); + iomap_readahead(rac, &zonefs_read_iomap_ops); } /* * Map blocks for page writeback. This is used only on conventional zone files, * which implies that the page range can only be within the fixed inode size. */ -static int zonefs_map_blocks(struct iomap_writepage_ctx *wpc, - struct inode *inode, loff_t offset) +static int zonefs_write_map_blocks(struct iomap_writepage_ctx *wpc, + struct inode *inode, loff_t offset) { struct zonefs_inode_info *zi = ZONEFS_I(inode); @@ -153,12 +186,12 @@ static int zonefs_map_blocks(struct iomap_writepage_ctx *wpc, offset < wpc->iomap.offset + wpc->iomap.length) return 0; - return zonefs_iomap_begin(inode, offset, zi->i_max_size - offset, - IOMAP_WRITE, &wpc->iomap, NULL); + return zonefs_write_iomap_begin(inode, offset, zi->i_max_size - offset, + IOMAP_WRITE, &wpc->iomap, NULL); } static const struct iomap_writeback_ops zonefs_writeback_ops = { - .map_blocks = zonefs_map_blocks, + .map_blocks = zonefs_write_map_blocks, }; static int zonefs_writepage(struct page *page, struct writeback_control *wbc) @@ -188,7 +221,8 @@ static int zonefs_swap_activate(struct swap_info_struct *sis, return -EINVAL; } - return iomap_swapfile_activate(sis, swap_file, span, &zonefs_iomap_ops); + return iomap_swapfile_activate(sis, swap_file, span, + &zonefs_read_iomap_ops); } static const struct address_space_operations zonefs_file_aops = { @@ -607,7 +641,7 @@ static vm_fault_t zonefs_filemap_page_mkwrite(struct vm_fault *vmf) /* Serialize against truncates */ filemap_invalidate_lock_shared(inode->i_mapping); - ret = iomap_page_mkwrite(vmf, &zonefs_iomap_ops); + ret = iomap_page_mkwrite(vmf, &zonefs_write_iomap_ops); filemap_invalidate_unlock_shared(inode->i_mapping); sb_end_pagefault(inode->i_sb); @@ -860,7 +894,7 @@ static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from) if (append) ret = zonefs_file_dio_append(iocb, from); else - ret = iomap_dio_rw(iocb, from, &zonefs_iomap_ops, + ret = iomap_dio_rw(iocb, from, &zonefs_write_iomap_ops, &zonefs_write_dio_ops, 0, 0); if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && (ret > 0 || ret == -EIOCBQUEUED)) { @@ -902,7 +936,7 @@ static ssize_t zonefs_file_buffered_write(struct kiocb *iocb, if (ret <= 0) goto inode_unlock; - ret = iomap_file_buffered_write(iocb, from, &zonefs_iomap_ops); + ret = iomap_file_buffered_write(iocb, from, &zonefs_write_iomap_ops); if (ret > 0) iocb->ki_pos += ret; else if (ret == -EIO) @@ -995,7 +1029,7 @@ static ssize_t zonefs_file_read_iter(struct kiocb *iocb, struct iov_iter *to) goto inode_unlock; } file_accessed(iocb->ki_filp); - ret = iomap_dio_rw(iocb, to, &zonefs_iomap_ops, + ret = iomap_dio_rw(iocb, to, &zonefs_read_iomap_ops, &zonefs_read_dio_ops, 0, 0); } else { ret = generic_file_read_iter(iocb, to);