| Message ID | 5372f29f986052f37b45c368a0eb8eed25eb8fdb.1683485700.git.ritesh.list@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | iomap: Add support for per-block dirty state to improve write performance | expand |
On Mon, May 08, 2023 at 12:57:58AM +0530, Ritesh Harjani (IBM) wrote: > Firstly this patch renames iop->uptodate to iop->state bitmap. > This is because we will add dirty state to iop->state bitmap in later > patches. So it makes sense to rename the iop->uptodate bitmap to > iop->state. > > Secondly this patch also adds other helpers for uptodate state bitmap > handling of iop->state. > > No functionality change in this patch. > > Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> > --- > fs/iomap/buffered-io.c | 78 +++++++++++++++++++++++++++++++----------- > 1 file changed, 58 insertions(+), 20 deletions(-) > > diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c > index e732581dc2d4..5103b644e115 100644 > --- a/fs/iomap/buffered-io.c > +++ b/fs/iomap/buffered-io.c ... > @@ -43,6 +43,47 @@ static inline struct iomap_page *to_iomap_page(struct folio *folio) ... > +/* > + * iop related helpers for checking uptodate/dirty state of per-block > + * or range of blocks within a folio > + */ > +static bool iop_test_full_uptodate(struct folio *folio) > +{ > + struct iomap_page *iop = to_iomap_page(folio); > + struct inode *inode = folio->mapping->host; > + > + WARN_ON(!iop); It looks like an oops or something is imminent here if iop is NULL. Why the warn (here and in a couple other places)? Brian > + return iop_bitmap_full(iop, i_blocks_per_folio(inode, folio)); > +} > + > +static bool iop_test_block_uptodate(struct folio *folio, unsigned int block) > +{ > + struct iomap_page *iop = to_iomap_page(folio); > + > + WARN_ON(!iop); > + return iop_test_block(iop, block); > +} > + > static void iop_set_range_uptodate(struct inode *inode, struct folio *folio, > size_t off, size_t len) > { > @@ -53,12 +94,11 @@ static void iop_set_range_uptodate(struct inode *inode, struct folio *folio, > unsigned long flags; > > if (iop) { > - spin_lock_irqsave(&iop->uptodate_lock, flags); > - bitmap_set(iop->uptodate, first_blk, nr_blks); > - if (bitmap_full(iop->uptodate, > - i_blocks_per_folio(inode, folio))) > + spin_lock_irqsave(&iop->state_lock, flags); > + iop_set_range(iop, first_blk, nr_blks); > + if (iop_test_full_uptodate(folio)) > folio_mark_uptodate(folio); > - spin_unlock_irqrestore(&iop->uptodate_lock, flags); > + spin_unlock_irqrestore(&iop->state_lock, flags); > } else { > folio_mark_uptodate(folio); > } > @@ -79,12 +119,12 @@ static struct iomap_page *iop_alloc(struct inode *inode, struct folio *folio, > else > gfp = GFP_NOFS | __GFP_NOFAIL; > > - iop = kzalloc(struct_size(iop, uptodate, BITS_TO_LONGS(nr_blocks)), > + iop = kzalloc(struct_size(iop, state, BITS_TO_LONGS(nr_blocks)), > gfp); > if (iop) { > - spin_lock_init(&iop->uptodate_lock); > + spin_lock_init(&iop->state_lock); > if (folio_test_uptodate(folio)) > - bitmap_fill(iop->uptodate, nr_blocks); > + iop_set_range(iop, 0, nr_blocks); > folio_attach_private(folio, iop); > } > return iop; > @@ -93,15 +133,13 @@ static struct iomap_page *iop_alloc(struct inode *inode, struct folio *folio, > static void iop_free(struct folio *folio) > { > struct iomap_page *iop = to_iomap_page(folio); > - struct inode *inode = folio->mapping->host; > - unsigned int nr_blocks = i_blocks_per_folio(inode, folio); > > if (!iop) > return; > WARN_ON_ONCE(atomic_read(&iop->read_bytes_pending)); > WARN_ON_ONCE(atomic_read(&iop->write_bytes_pending)); > - WARN_ON_ONCE(bitmap_full(iop->uptodate, nr_blocks) != > - folio_test_uptodate(folio)); > + WARN_ON_ONCE(iop_test_full_uptodate(folio) != > + folio_test_uptodate(folio)); > folio_detach_private(folio); > kfree(iop); > } > @@ -132,7 +170,7 @@ static void iomap_adjust_read_range(struct inode *inode, struct folio *folio, > > /* move forward for each leading block marked uptodate */ > for (i = first; i <= last; i++) { > - if (!test_bit(i, iop->uptodate)) > + if (!iop_test_block_uptodate(folio, i)) > break; > *pos += block_size; > poff += block_size; > @@ -142,7 +180,7 @@ static void iomap_adjust_read_range(struct inode *inode, struct folio *folio, > > /* truncate len if we find any trailing uptodate block(s) */ > for ( ; i <= last; i++) { > - if (test_bit(i, iop->uptodate)) { > + if (iop_test_block_uptodate(folio, i)) { > plen -= (last - i + 1) * block_size; > last = i - 1; > break; > @@ -450,7 +488,7 @@ bool iomap_is_partially_uptodate(struct folio *folio, size_t from, size_t count) > last = (from + count - 1) >> inode->i_blkbits; > > for (i = first; i <= last; i++) > - if (!test_bit(i, iop->uptodate)) > + if (!iop_test_block_uptodate(folio, i)) > return false; > return true; > } > @@ -1634,7 +1672,7 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc, > * invalid, grab a new one. > */ > for (i = 0; i < nblocks && pos < end_pos; i++, pos += len) { > - if (iop && !test_bit(i, iop->uptodate)) > + if (iop && !iop_test_block_uptodate(folio, i)) > continue; > > error = wpc->ops->map_blocks(wpc, inode, pos); > -- > 2.39.2 >
Brian Foster <bfoster@redhat.com> writes: > On Mon, May 08, 2023 at 12:57:58AM +0530, Ritesh Harjani (IBM) wrote: >> Firstly this patch renames iop->uptodate to iop->state bitmap. >> This is because we will add dirty state to iop->state bitmap in later >> patches. So it makes sense to rename the iop->uptodate bitmap to >> iop->state. >> >> Secondly this patch also adds other helpers for uptodate state bitmap >> handling of iop->state. >> >> No functionality change in this patch. >> >> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> >> --- >> fs/iomap/buffered-io.c | 78 +++++++++++++++++++++++++++++++----------- >> 1 file changed, 58 insertions(+), 20 deletions(-) >> >> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c >> index e732581dc2d4..5103b644e115 100644 >> --- a/fs/iomap/buffered-io.c >> +++ b/fs/iomap/buffered-io.c > ... >> @@ -43,6 +43,47 @@ static inline struct iomap_page *to_iomap_page(struct folio *folio) > ... >> +/* >> + * iop related helpers for checking uptodate/dirty state of per-block >> + * or range of blocks within a folio >> + */ >> +static bool iop_test_full_uptodate(struct folio *folio) >> +{ >> + struct iomap_page *iop = to_iomap_page(folio); >> + struct inode *inode = folio->mapping->host; >> + >> + WARN_ON(!iop); > > It looks like an oops or something is imminent here if iop is NULL. Why > the warn (here and in a couple other places)? > I agree. I will remove it in the next revision. -ritesh > Brian > >> + return iop_bitmap_full(iop, i_blocks_per_folio(inode, folio)); >> +} >> + >> +static bool iop_test_block_uptodate(struct folio *folio, unsigned int block) >> +{ >> + struct iomap_page *iop = to_iomap_page(folio); >> + >> + WARN_ON(!iop); >> + return iop_test_block(iop, block); >> +} >> + >> static void iop_set_range_uptodate(struct inode *inode, struct folio *folio, >> size_t off, size_t len) >> { >> @@ -53,12 +94,11 @@ static void iop_set_range_uptodate(struct inode *inode, struct folio *folio, >> unsigned long flags; >> >> if (iop) { >> - spin_lock_irqsave(&iop->uptodate_lock, flags); >> - bitmap_set(iop->uptodate, first_blk, nr_blks); >> - if (bitmap_full(iop->uptodate, >> - i_blocks_per_folio(inode, folio))) >> + spin_lock_irqsave(&iop->state_lock, flags); >> + iop_set_range(iop, first_blk, nr_blks); >> + if (iop_test_full_uptodate(folio)) >> folio_mark_uptodate(folio); >> - spin_unlock_irqrestore(&iop->uptodate_lock, flags); >> + spin_unlock_irqrestore(&iop->state_lock, flags); >> } else { >> folio_mark_uptodate(folio); >> } >> @@ -79,12 +119,12 @@ static struct iomap_page *iop_alloc(struct inode *inode, struct folio *folio, >> else >> gfp = GFP_NOFS | __GFP_NOFAIL; >> >> - iop = kzalloc(struct_size(iop, uptodate, BITS_TO_LONGS(nr_blocks)), >> + iop = kzalloc(struct_size(iop, state, BITS_TO_LONGS(nr_blocks)), >> gfp); >> if (iop) { >> - spin_lock_init(&iop->uptodate_lock); >> + spin_lock_init(&iop->state_lock); >> if (folio_test_uptodate(folio)) >> - bitmap_fill(iop->uptodate, nr_blocks); >> + iop_set_range(iop, 0, nr_blocks); >> folio_attach_private(folio, iop); >> } >> return iop; >> @@ -93,15 +133,13 @@ static struct iomap_page *iop_alloc(struct inode *inode, struct folio *folio, >> static void iop_free(struct folio *folio) >> { >> struct iomap_page *iop = to_iomap_page(folio); >> - struct inode *inode = folio->mapping->host; >> - unsigned int nr_blocks = i_blocks_per_folio(inode, folio); >> >> if (!iop) >> return; >> WARN_ON_ONCE(atomic_read(&iop->read_bytes_pending)); >> WARN_ON_ONCE(atomic_read(&iop->write_bytes_pending)); >> - WARN_ON_ONCE(bitmap_full(iop->uptodate, nr_blocks) != >> - folio_test_uptodate(folio)); >> + WARN_ON_ONCE(iop_test_full_uptodate(folio) != >> + folio_test_uptodate(folio)); >> folio_detach_private(folio); >> kfree(iop); >> } >> @@ -132,7 +170,7 @@ static void iomap_adjust_read_range(struct inode *inode, struct folio *folio, >> >> /* move forward for each leading block marked uptodate */ >> for (i = first; i <= last; i++) { >> - if (!test_bit(i, iop->uptodate)) >> + if (!iop_test_block_uptodate(folio, i)) >> break; >> *pos += block_size; >> poff += block_size; >> @@ -142,7 +180,7 @@ static void iomap_adjust_read_range(struct inode *inode, struct folio *folio, >> >> /* truncate len if we find any trailing uptodate block(s) */ >> for ( ; i <= last; i++) { >> - if (test_bit(i, iop->uptodate)) { >> + if (iop_test_block_uptodate(folio, i)) { >> plen -= (last - i + 1) * block_size; >> last = i - 1; >> break; >> @@ -450,7 +488,7 @@ bool iomap_is_partially_uptodate(struct folio *folio, size_t from, size_t count) >> last = (from + count - 1) >> inode->i_blkbits; >> >> for (i = first; i <= last; i++) >> - if (!test_bit(i, iop->uptodate)) >> + if (!iop_test_block_uptodate(folio, i)) >> return false; >> return true; >> } >> @@ -1634,7 +1672,7 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc, >> * invalid, grab a new one. >> */ >> for (i = 0; i < nblocks && pos < end_pos; i++, pos += len) { >> - if (iop && !test_bit(i, iop->uptodate)) >> + if (iop && !iop_test_block_uptodate(folio, i)) >> continue; >> >> error = wpc->ops->map_blocks(wpc, inode, pos); >> -- >> 2.39.2 >>
> + * inline helpers for bitmap operations on iop->state > + */ > +static inline void iop_set_range(struct iomap_page *iop, unsigned int start_blk, > + unsigned int nr_blks) > +{ > + bitmap_set(iop->state, start_blk, nr_blks); > +} > + > +static inline bool iop_test_block(struct iomap_page *iop, unsigned int block) > +{ > + return test_bit(block, iop->state); > +} > + > +static inline bool iop_bitmap_full(struct iomap_page *iop, > + unsigned int blks_per_folio) > +{ > + return bitmap_full(iop->state, blks_per_folio); > +} I don't really see much poin in these helpers, any particular reason for adding them? > +/* > + * iop related helpers for checking uptodate/dirty state of per-block > + * or range of blocks within a folio > + */ I'm also not sure this comment adds a whole lot of value. The rest looks good modulo the WARN_ONs already mentined by Brian.
Christoph Hellwig <hch@infradead.org> writes: >> + * inline helpers for bitmap operations on iop->state >> + */ >> +static inline void iop_set_range(struct iomap_page *iop, unsigned int start_blk, >> + unsigned int nr_blks) >> +{ >> + bitmap_set(iop->state, start_blk, nr_blks); >> +} >> + >> +static inline bool iop_test_block(struct iomap_page *iop, unsigned int block) >> +{ >> + return test_bit(block, iop->state); >> +} >> + >> +static inline bool iop_bitmap_full(struct iomap_page *iop, >> + unsigned int blks_per_folio) >> +{ >> + return bitmap_full(iop->state, blks_per_folio); >> +} > > I don't really see much poin in these helpers, any particular reason > for adding them? > We ended up modifying the APIs in v5. The idea on v4 was we will keep iop_set_range() function which will be same for both uptodate and dirty. The caller can pass start_blk depending upon whether we dirty/uptodate needs to be marked. But I guess with the API changes, we don't need this low level helpers anymore. So If no one has any objection, I can kill this one liners. >> +/* >> + * iop related helpers for checking uptodate/dirty state of per-block >> + * or range of blocks within a folio >> + */ > > I'm also not sure this comment adds a whole lot of value. > > The rest looks good modulo the WARN_ONs already mentined by Brian. Sure. Thanks for the review! -ritesh
On Fri, May 19, 2023 at 08:37:01PM +0530, Ritesh Harjani wrote: > We ended up modifying the APIs in v5. The idea on v4 was we will keep > iop_set_range() function which will be same for both uptodate and dirty. > The caller can pass start_blk depending upon whether we dirty/uptodate > needs to be marked. > But I guess with the API changes, we don't need this low level helpers > anymore. So If no one has any objection, I can kill this one liners. Yes, the actually uptodate/dirty helper isolate the caller from the API. We don't really need another tiny wrapper here.
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index e732581dc2d4..5103b644e115 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -24,14 +24,14 @@ #define IOEND_BATCH_SIZE 4096 /* - * Structure allocated for each folio when block size < folio size - * to track sub-folio uptodate status and I/O completions. + * Structure allocated for each folio to track per-block uptodate state + * and I/O completions. */ struct iomap_page { atomic_t read_bytes_pending; atomic_t write_bytes_pending; - spinlock_t uptodate_lock; - unsigned long uptodate[]; + spinlock_t state_lock; + unsigned long state[]; }; static inline struct iomap_page *to_iomap_page(struct folio *folio) @@ -43,6 +43,47 @@ static inline struct iomap_page *to_iomap_page(struct folio *folio) static struct bio_set iomap_ioend_bioset; +/* + * inline helpers for bitmap operations on iop->state + */ +static inline void iop_set_range(struct iomap_page *iop, unsigned int start_blk, + unsigned int nr_blks) +{ + bitmap_set(iop->state, start_blk, nr_blks); +} + +static inline bool iop_test_block(struct iomap_page *iop, unsigned int block) +{ + return test_bit(block, iop->state); +} + +static inline bool iop_bitmap_full(struct iomap_page *iop, + unsigned int blks_per_folio) +{ + return bitmap_full(iop->state, blks_per_folio); +} + +/* + * iop related helpers for checking uptodate/dirty state of per-block + * or range of blocks within a folio + */ +static bool iop_test_full_uptodate(struct folio *folio) +{ + struct iomap_page *iop = to_iomap_page(folio); + struct inode *inode = folio->mapping->host; + + WARN_ON(!iop); + return iop_bitmap_full(iop, i_blocks_per_folio(inode, folio)); +} + +static bool iop_test_block_uptodate(struct folio *folio, unsigned int block) +{ + struct iomap_page *iop = to_iomap_page(folio); + + WARN_ON(!iop); + return iop_test_block(iop, block); +} + static void iop_set_range_uptodate(struct inode *inode, struct folio *folio, size_t off, size_t len) { @@ -53,12 +94,11 @@ static void iop_set_range_uptodate(struct inode *inode, struct folio *folio, unsigned long flags; if (iop) { - spin_lock_irqsave(&iop->uptodate_lock, flags); - bitmap_set(iop->uptodate, first_blk, nr_blks); - if (bitmap_full(iop->uptodate, - i_blocks_per_folio(inode, folio))) + spin_lock_irqsave(&iop->state_lock, flags); + iop_set_range(iop, first_blk, nr_blks); + if (iop_test_full_uptodate(folio)) folio_mark_uptodate(folio); - spin_unlock_irqrestore(&iop->uptodate_lock, flags); + spin_unlock_irqrestore(&iop->state_lock, flags); } else { folio_mark_uptodate(folio); } @@ -79,12 +119,12 @@ static struct iomap_page *iop_alloc(struct inode *inode, struct folio *folio, else gfp = GFP_NOFS | __GFP_NOFAIL; - iop = kzalloc(struct_size(iop, uptodate, BITS_TO_LONGS(nr_blocks)), + iop = kzalloc(struct_size(iop, state, BITS_TO_LONGS(nr_blocks)), gfp); if (iop) { - spin_lock_init(&iop->uptodate_lock); + spin_lock_init(&iop->state_lock); if (folio_test_uptodate(folio)) - bitmap_fill(iop->uptodate, nr_blocks); + iop_set_range(iop, 0, nr_blocks); folio_attach_private(folio, iop); } return iop; @@ -93,15 +133,13 @@ static struct iomap_page *iop_alloc(struct inode *inode, struct folio *folio, static void iop_free(struct folio *folio) { struct iomap_page *iop = to_iomap_page(folio); - struct inode *inode = folio->mapping->host; - unsigned int nr_blocks = i_blocks_per_folio(inode, folio); if (!iop) return; WARN_ON_ONCE(atomic_read(&iop->read_bytes_pending)); WARN_ON_ONCE(atomic_read(&iop->write_bytes_pending)); - WARN_ON_ONCE(bitmap_full(iop->uptodate, nr_blocks) != - folio_test_uptodate(folio)); + WARN_ON_ONCE(iop_test_full_uptodate(folio) != + folio_test_uptodate(folio)); folio_detach_private(folio); kfree(iop); } @@ -132,7 +170,7 @@ static void iomap_adjust_read_range(struct inode *inode, struct folio *folio, /* move forward for each leading block marked uptodate */ for (i = first; i <= last; i++) { - if (!test_bit(i, iop->uptodate)) + if (!iop_test_block_uptodate(folio, i)) break; *pos += block_size; poff += block_size; @@ -142,7 +180,7 @@ static void iomap_adjust_read_range(struct inode *inode, struct folio *folio, /* truncate len if we find any trailing uptodate block(s) */ for ( ; i <= last; i++) { - if (test_bit(i, iop->uptodate)) { + if (iop_test_block_uptodate(folio, i)) { plen -= (last - i + 1) * block_size; last = i - 1; break; @@ -450,7 +488,7 @@ bool iomap_is_partially_uptodate(struct folio *folio, size_t from, size_t count) last = (from + count - 1) >> inode->i_blkbits; for (i = first; i <= last; i++) - if (!test_bit(i, iop->uptodate)) + if (!iop_test_block_uptodate(folio, i)) return false; return true; } @@ -1634,7 +1672,7 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc, * invalid, grab a new one. */ for (i = 0; i < nblocks && pos < end_pos; i++, pos += len) { - if (iop && !test_bit(i, iop->uptodate)) + if (iop && !iop_test_block_uptodate(folio, i)) continue; error = wpc->ops->map_blocks(wpc, inode, pos);
Firstly this patch renames iop->uptodate to iop->state bitmap. This is because we will add dirty state to iop->state bitmap in later patches. So it makes sense to rename the iop->uptodate bitmap to iop->state. Secondly this patch also adds other helpers for uptodate state bitmap handling of iop->state. No functionality change in this patch. Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> --- fs/iomap/buffered-io.c | 78 +++++++++++++++++++++++++++++++----------- 1 file changed, 58 insertions(+), 20 deletions(-)