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-rw-r--r--fs/zonefs/super.c94
1 files changed, 64 insertions, 30 deletions
diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
index 123464d2145a..053299758deb 100644
--- a/fs/zonefs/super.c
+++ b/fs/zonefs/super.c
@@ -110,15 +110,51 @@ static inline void zonefs_i_size_write(struct inode *inode, loff_t isize)
}
}
-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;
@@ -128,7 +164,7 @@ 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;
/*
@@ -137,47 +173,44 @@ 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);
+ 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 (offset >= isize)
+ if (iomap->offset >= isize) {
iomap->type = IOMAP_UNWRITTEN;
- else
+ iomap->length = zi->i_max_size - iomap->offset;
+ } else {
iomap->type = IOMAP_MAPPED;
- if (flags & IOMAP_WRITE)
- length = zi->i_max_size - offset;
- else
- length = min(length, isize - offset);
+ iomap->length = isize - iomap->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->addr = (zi->i_zsector << SECTOR_SHIFT) + iomap->offset;
-
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_read_folio(struct file *unused, struct folio *folio)
{
- return iomap_read_folio(folio, &zonefs_iomap_ops);
+ return iomap_read_folio(folio, &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);
@@ -191,12 +224,12 @@ 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)
@@ -226,7 +259,8 @@ 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 = {
@@ -647,7 +681,7 @@ 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);
@@ -899,7 +933,7 @@ 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, NULL, 0);
if (zi->i_ztype == ZONEFS_ZTYPE_SEQ &&
(ret > 0 || ret == -EIOCBQUEUED)) {
@@ -948,7 +982,7 @@ 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)
@@ -1041,7 +1075,7 @@ 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, NULL, 0);
} else {
ret = generic_file_read_iter(iocb, to);
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-25 07:13:50 +0000