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iomap_readpage_iter() handles "uptodate blocks" and "not uptodate blocks" within a folio separately. This makes iomap_read_folio() to call into ->iomap_begin() to request for extent mapping even though it might already have an extent which is not fully processed. This happens when we either have a large folio or with bs < ps. In these cases we can have sub blocks which can be uptodate (say for e.g. due to previous writes). With iomap_read_folio_iter(), this is handled more efficiently by not calling ->iomap_begin() call until all the sub blocks with the current folio are processed. iomap_read_folio_iter() handles multiple sub blocks within a given folio but it's implementation logic is similar to how iomap_readahead_iter() handles multiple folios within a single mapped extent. Both of them iterate over a given range of folio/mapped extent and call iomap_readpage_iter() for reading. Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Link: https://lore.kernel.org/r/92ae9f3333c9a7e66214568d08f45664261c899c.1715067055.git.ritesh.list@gmail.com Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> cc: Ojaswin Mujoo <ojaswin@linux.ibm.com> Signed-off-by: Christian Brauner <brauner@kernel.org> |
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| .. | ||
| buffered-io.c | ||
| direct-io.c | ||
| fiemap.c | ||
| iter.c | ||
| Makefile | ||
| seek.c | ||
| swapfile.c | ||
| trace.c | ||
| trace.h | ||