| Message ID | 20210511030933.3080921-6-ruansy.fnst@fujitsu.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | fsdax,xfs: Add reflink&dedupe support for fsdax | expand |
On Tue, May 11, 2021 at 11:09:31AM +0800, Shiyang Ruan wrote: > With dax we cannot deal with readpage() etc. So, we create a dax > comparison funciton which is similar with > vfs_dedupe_file_range_compare(). > And introduce dax_remap_file_range_prep() for filesystem use. > > Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> > Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com> > --- > fs/dax.c | 56 +++++++++++++++++++++++++++++++++++++++++++ > fs/remap_range.c | 57 +++++++++++++++++++++++++++++++++++++------- > fs/xfs/xfs_reflink.c | 8 +++++-- > include/linux/dax.h | 4 ++++ > include/linux/fs.h | 12 ++++++---- > 5 files changed, 123 insertions(+), 14 deletions(-) > > diff --git a/fs/dax.c b/fs/dax.c > index ee9d28a79bfb..dedf1be0155c 100644 > --- a/fs/dax.c > +++ b/fs/dax.c > @@ -1853,3 +1853,59 @@ vm_fault_t dax_finish_sync_fault(struct vm_fault *vmf, > return dax_insert_pfn_mkwrite(vmf, pfn, order); > } > EXPORT_SYMBOL_GPL(dax_finish_sync_fault); > + > +static loff_t dax_range_compare_actor(struct inode *ino1, loff_t pos1, > + struct inode *ino2, loff_t pos2, loff_t len, void *data, > + struct iomap *smap, struct iomap *dmap) > +{ > + void *saddr, *daddr; > + bool *same = data; > + int ret; > + > + if (smap->type == IOMAP_HOLE && dmap->type == IOMAP_HOLE) { > + *same = true; > + return len; > + } > + > + if (smap->type == IOMAP_HOLE || dmap->type == IOMAP_HOLE) { > + *same = false; > + return 0; > + } > + > + ret = dax_iomap_direct_access(smap, pos1, ALIGN(pos1 + len, PAGE_SIZE), > + &saddr, NULL); > + if (ret < 0) > + return -EIO; > + > + ret = dax_iomap_direct_access(dmap, pos2, ALIGN(pos2 + len, PAGE_SIZE), > + &daddr, NULL); > + if (ret < 0) > + return -EIO; > + > + *same = !memcmp(saddr, daddr, len); > + return len; > +} > + > +int dax_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > + struct inode *dest, loff_t destoff, loff_t len, bool *is_same, > + const struct iomap_ops *ops) > +{ > + int id, ret = 0; > + > + id = dax_read_lock(); > + while (len) { > + ret = iomap_apply2(src, srcoff, dest, destoff, len, 0, ops, > + is_same, dax_range_compare_actor); > + if (ret < 0 || !*is_same) > + goto out; > + > + len -= ret; > + srcoff += ret; > + destoff += ret; > + } > + ret = 0; > +out: > + dax_read_unlock(id); > + return ret; > +} > +EXPORT_SYMBOL_GPL(dax_dedupe_file_range_compare); > diff --git a/fs/remap_range.c b/fs/remap_range.c > index e4a5fdd7ad7b..7bc4c8e3aa9f 100644 > --- a/fs/remap_range.c > +++ b/fs/remap_range.c > @@ -14,6 +14,7 @@ > #include <linux/compat.h> > #include <linux/mount.h> > #include <linux/fs.h> > +#include <linux/dax.h> > #include "internal.h" > > #include <linux/uaccess.h> > @@ -199,9 +200,9 @@ static void vfs_unlock_two_pages(struct page *page1, struct page *page2) > * Compare extents of two files to see if they are the same. > * Caller must have locked both inodes to prevent write races. > */ > -static int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > - struct inode *dest, loff_t destoff, > - loff_t len, bool *is_same) > +int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > + struct inode *dest, loff_t destoff, > + loff_t len, bool *is_same) > { > loff_t src_poff; > loff_t dest_poff; > @@ -280,6 +281,7 @@ static int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > out_error: > return error; > } > +EXPORT_SYMBOL(vfs_dedupe_file_range_compare); > > /* > * Check that the two inodes are eligible for cloning, the ranges make > @@ -289,9 +291,11 @@ static int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > * If there's an error, then the usual negative error code is returned. > * Otherwise returns 0 with *len set to the request length. > */ > -int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > - struct file *file_out, loff_t pos_out, > - loff_t *len, unsigned int remap_flags) > +static int > +__generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > + struct file *file_out, loff_t pos_out, > + loff_t *len, unsigned int remap_flags, > + const struct iomap_ops *dax_read_ops) > { > struct inode *inode_in = file_inode(file_in); > struct inode *inode_out = file_inode(file_out); > @@ -351,8 +355,17 @@ int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > if (remap_flags & REMAP_FILE_DEDUP) { > bool is_same = false; > > - ret = vfs_dedupe_file_range_compare(inode_in, pos_in, > - inode_out, pos_out, *len, &is_same); > + if (!IS_DAX(inode_in)) > + ret = vfs_dedupe_file_range_compare(inode_in, pos_in, > + inode_out, pos_out, *len, &is_same); > +#ifdef CONFIG_FS_DAX > + else if (dax_read_ops) > + ret = dax_dedupe_file_range_compare(inode_in, pos_in, > + inode_out, pos_out, *len, &is_same, > + dax_read_ops); > +#endif /* CONFIG_FS_DAX */ Hmm, can you add an entry to the !IS_ENABLED(CONFIG_DAX) part of dax.h that defines dax_dedupe_file_range_compare as a dummy function that returns -EOPNOTSUPP? We try not to sprinkle preprocessor directives into the middle of functions, per Linus rules. > + else > + return -EINVAL; > if (ret) > return ret; > if (!is_same) > @@ -370,6 +383,34 @@ int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > return ret; > } > + > +#ifdef CONFIG_FS_DAX > +int dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, > + struct file *file_out, loff_t pos_out, > + loff_t *len, unsigned int remap_flags, > + const struct iomap_ops *ops) > +{ > + return __generic_remap_file_range_prep(file_in, pos_in, file_out, > + pos_out, len, remap_flags, ops); > +} > +#else > +int dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, > + struct file *file_out, loff_t pos_out, > + loff_t *len, unsigned int remap_flags, > + const struct iomap_ops *ops) > +{ > + return -EOPNOTSUPP; > +} > +#endif /* CONFIG_FS_DAX */ > +EXPORT_SYMBOL(dax_remap_file_range_prep); I think this symbol belongs in fs/dax.c and the declaration in dax.h? --D > +int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > + struct file *file_out, loff_t pos_out, > + loff_t *len, unsigned int remap_flags) > +{ > + return __generic_remap_file_range_prep(file_in, pos_in, file_out, > + pos_out, len, remap_flags, NULL); > +} > EXPORT_SYMBOL(generic_remap_file_range_prep); > > loff_t do_clone_file_range(struct file *file_in, loff_t pos_in, > diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c > index 060695d6d56a..d25434f93235 100644 > --- a/fs/xfs/xfs_reflink.c > +++ b/fs/xfs/xfs_reflink.c > @@ -1329,8 +1329,12 @@ xfs_reflink_remap_prep( > if (IS_DAX(inode_in) || IS_DAX(inode_out)) > goto out_unlock; > > - ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out, > - len, remap_flags); > + if (!IS_DAX(inode_in)) > + ret = generic_remap_file_range_prep(file_in, pos_in, file_out, > + pos_out, len, remap_flags); > + else > + ret = dax_remap_file_range_prep(file_in, pos_in, file_out, > + pos_out, len, remap_flags, &xfs_read_iomap_ops); > if (ret || *len == 0) > goto out_unlock; > > diff --git a/include/linux/dax.h b/include/linux/dax.h > index 3275e01ed33d..32e1c34349f2 100644 > --- a/include/linux/dax.h > +++ b/include/linux/dax.h > @@ -239,6 +239,10 @@ int dax_invalidate_mapping_entry_sync(struct address_space *mapping, > pgoff_t index); > s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap, > struct iomap *srcmap); > +int dax_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > + struct inode *dest, loff_t destoff, > + loff_t len, bool *is_same, > + const struct iomap_ops *ops); > static inline bool dax_mapping(struct address_space *mapping) > { > return mapping->host && IS_DAX(mapping->host); > diff --git a/include/linux/fs.h b/include/linux/fs.h > index c3c88fdb9b2a..e2c348553d87 100644 > --- a/include/linux/fs.h > +++ b/include/linux/fs.h > @@ -71,6 +71,7 @@ struct fsverity_operations; > struct fs_context; > struct fs_parameter_spec; > struct fileattr; > +struct iomap_ops; > > extern void __init inode_init(void); > extern void __init inode_init_early(void); > @@ -2126,10 +2127,13 @@ extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *, > extern ssize_t generic_copy_file_range(struct file *file_in, loff_t pos_in, > struct file *file_out, loff_t pos_out, > size_t len, unsigned int flags); > -extern int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > - struct file *file_out, loff_t pos_out, > - loff_t *count, > - unsigned int remap_flags); > +int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > + struct file *file_out, loff_t pos_out, > + loff_t *count, unsigned int remap_flags); > +int dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, > + struct file *file_out, loff_t pos_out, > + loff_t *len, unsigned int remap_flags, > + const struct iomap_ops *ops); > extern loff_t do_clone_file_range(struct file *file_in, loff_t pos_in, > struct file *file_out, loff_t pos_out, > loff_t len, unsigned int remap_flags); > -- > 2.31.1 > > >
> -----Original Message----- > From: Darrick J. Wong <djwong@kernel.org> > Subject: Re: [PATCH v5 5/7] fsdax: Dedup file range to use a compare function > > On Tue, May 11, 2021 at 11:09:31AM +0800, Shiyang Ruan wrote: > > With dax we cannot deal with readpage() etc. So, we create a dax > > comparison funciton which is similar with > > vfs_dedupe_file_range_compare(). > > And introduce dax_remap_file_range_prep() for filesystem use. > > > > Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> > > Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com> > > --- > > fs/dax.c | 56 > +++++++++++++++++++++++++++++++++++++++++++ > > fs/remap_range.c | 57 > +++++++++++++++++++++++++++++++++++++------- > > fs/xfs/xfs_reflink.c | 8 +++++-- > > include/linux/dax.h | 4 ++++ > > include/linux/fs.h | 12 ++++++---- > > 5 files changed, 123 insertions(+), 14 deletions(-) > > > > diff --git a/fs/dax.c b/fs/dax.c > > index ee9d28a79bfb..dedf1be0155c 100644 > > --- a/fs/dax.c > > +++ b/fs/dax.c > > @@ -1853,3 +1853,59 @@ vm_fault_t dax_finish_sync_fault(struct vm_fault > *vmf, > > return dax_insert_pfn_mkwrite(vmf, pfn, order); } > > EXPORT_SYMBOL_GPL(dax_finish_sync_fault); > > + > > +static loff_t dax_range_compare_actor(struct inode *ino1, loff_t pos1, > > + struct inode *ino2, loff_t pos2, loff_t len, void *data, > > + struct iomap *smap, struct iomap *dmap) { > > + void *saddr, *daddr; > > + bool *same = data; > > + int ret; > > + > > + if (smap->type == IOMAP_HOLE && dmap->type == IOMAP_HOLE) { > > + *same = true; > > + return len; > > + } > > + > > + if (smap->type == IOMAP_HOLE || dmap->type == IOMAP_HOLE) { > > + *same = false; > > + return 0; > > + } > > + > > + ret = dax_iomap_direct_access(smap, pos1, ALIGN(pos1 + len, PAGE_SIZE), > > + &saddr, NULL); > > + if (ret < 0) > > + return -EIO; > > + > > + ret = dax_iomap_direct_access(dmap, pos2, ALIGN(pos2 + len, PAGE_SIZE), > > + &daddr, NULL); > > + if (ret < 0) > > + return -EIO; > > + > > + *same = !memcmp(saddr, daddr, len); > > + return len; > > +} > > + > > +int dax_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > > + struct inode *dest, loff_t destoff, loff_t len, bool *is_same, > > + const struct iomap_ops *ops) > > +{ > > + int id, ret = 0; > > + > > + id = dax_read_lock(); > > + while (len) { > > + ret = iomap_apply2(src, srcoff, dest, destoff, len, 0, ops, > > + is_same, dax_range_compare_actor); > > + if (ret < 0 || !*is_same) > > + goto out; > > + > > + len -= ret; > > + srcoff += ret; > > + destoff += ret; > > + } > > + ret = 0; > > +out: > > + dax_read_unlock(id); > > + return ret; > > +} > > +EXPORT_SYMBOL_GPL(dax_dedupe_file_range_compare); > > diff --git a/fs/remap_range.c b/fs/remap_range.c index > > e4a5fdd7ad7b..7bc4c8e3aa9f 100644 > > --- a/fs/remap_range.c > > +++ b/fs/remap_range.c > > @@ -14,6 +14,7 @@ > > #include <linux/compat.h> > > #include <linux/mount.h> > > #include <linux/fs.h> > > +#include <linux/dax.h> > > #include "internal.h" > > > > #include <linux/uaccess.h> > > @@ -199,9 +200,9 @@ static void vfs_unlock_two_pages(struct page *page1, > struct page *page2) > > * Compare extents of two files to see if they are the same. > > * Caller must have locked both inodes to prevent write races. > > */ > > -static int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > > - struct inode *dest, loff_t destoff, > > - loff_t len, bool *is_same) > > +int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > > + struct inode *dest, loff_t destoff, > > + loff_t len, bool *is_same) > > { > > loff_t src_poff; > > loff_t dest_poff; > > @@ -280,6 +281,7 @@ static int vfs_dedupe_file_range_compare(struct > > inode *src, loff_t srcoff, > > out_error: > > return error; > > } > > +EXPORT_SYMBOL(vfs_dedupe_file_range_compare); > > > > /* > > * Check that the two inodes are eligible for cloning, the ranges > > make @@ -289,9 +291,11 @@ static int > vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > > * If there's an error, then the usual negative error code is returned. > > * Otherwise returns 0 with *len set to the request length. > > */ > > -int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > - struct file *file_out, loff_t pos_out, > > - loff_t *len, unsigned int remap_flags) > > +static int > > +__generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > + struct file *file_out, loff_t pos_out, > > + loff_t *len, unsigned int remap_flags, > > + const struct iomap_ops *dax_read_ops) > > { > > struct inode *inode_in = file_inode(file_in); > > struct inode *inode_out = file_inode(file_out); @@ -351,8 +355,17 @@ > > int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > if (remap_flags & REMAP_FILE_DEDUP) { > > bool is_same = false; > > > > - ret = vfs_dedupe_file_range_compare(inode_in, pos_in, > > - inode_out, pos_out, *len, &is_same); > > + if (!IS_DAX(inode_in)) > > + ret = vfs_dedupe_file_range_compare(inode_in, pos_in, > > + inode_out, pos_out, *len, &is_same); #ifdef > CONFIG_FS_DAX > > + else if (dax_read_ops) > > + ret = dax_dedupe_file_range_compare(inode_in, pos_in, > > + inode_out, pos_out, *len, &is_same, > > + dax_read_ops); > > +#endif /* CONFIG_FS_DAX */ > > Hmm, can you add an entry to the !IS_ENABLED(CONFIG_DAX) part of dax.h > that defines dax_dedupe_file_range_compare as a dummy function that returns > -EOPNOTSUPP? We try not to sprinkle preprocessor directives into the middle > of functions, per Linus rules. I found that it's ok to build without the #ifdef and #endif here, even though CONFIG_FS_DAX is disabled. And like other dax functions in fs/dax.c, such as dax_iomap_rw(), it is declared in include/linux/dax.h without IS_ENABLED() or #ifdef wrapped. And xfs calls it directly and it won't cause build error. So, I think I could just remove the #ifdef here, but I am not sure if this obeys the rule. > > > + else > > + return -EINVAL; > > if (ret) > > return ret; > > if (!is_same) > > @@ -370,6 +383,34 @@ int generic_remap_file_range_prep(struct file > > *file_in, loff_t pos_in, > > > > return ret; > > } > > + > > +#ifdef CONFIG_FS_DAX > > +int dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > + struct file *file_out, loff_t pos_out, > > + loff_t *len, unsigned int remap_flags, > > + const struct iomap_ops *ops) { > > + return __generic_remap_file_range_prep(file_in, pos_in, file_out, > > + pos_out, len, remap_flags, ops); } #else int > > +dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > + struct file *file_out, loff_t pos_out, > > + loff_t *len, unsigned int remap_flags, > > + const struct iomap_ops *ops) { > > + return -EOPNOTSUPP; > > +} > > +#endif /* CONFIG_FS_DAX */ > > +EXPORT_SYMBOL(dax_remap_file_range_prep); > > I think this symbol belongs in fs/dax.c and the declaration in dax.h? For the function name, it does should belong to fs/dax. But if so, __generic_remap_file_range_prep() needs to be called in fs/dax. I don't think this is good. -- Thanks, Ruan Shiyang. > > --D > > > +int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > + struct file *file_out, loff_t pos_out, > > + loff_t *len, unsigned int remap_flags) { > > + return __generic_remap_file_range_prep(file_in, pos_in, file_out, > > + pos_out, len, remap_flags, NULL); } > > EXPORT_SYMBOL(generic_remap_file_range_prep); > > > > loff_t do_clone_file_range(struct file *file_in, loff_t pos_in, diff > > --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index > > 060695d6d56a..d25434f93235 100644 > > --- a/fs/xfs/xfs_reflink.c > > +++ b/fs/xfs/xfs_reflink.c > > @@ -1329,8 +1329,12 @@ xfs_reflink_remap_prep( > > if (IS_DAX(inode_in) || IS_DAX(inode_out)) > > goto out_unlock; > > > > - ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out, > > - len, remap_flags); > > + if (!IS_DAX(inode_in)) > > + ret = generic_remap_file_range_prep(file_in, pos_in, file_out, > > + pos_out, len, remap_flags); > > + else > > + ret = dax_remap_file_range_prep(file_in, pos_in, file_out, > > + pos_out, len, remap_flags, &xfs_read_iomap_ops); > > if (ret || *len == 0) > > goto out_unlock; > > > > diff --git a/include/linux/dax.h b/include/linux/dax.h index > > 3275e01ed33d..32e1c34349f2 100644 > > --- a/include/linux/dax.h > > +++ b/include/linux/dax.h > > @@ -239,6 +239,10 @@ int dax_invalidate_mapping_entry_sync(struct > address_space *mapping, > > pgoff_t index); > > s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap, > > struct iomap *srcmap); > > +int dax_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > > + struct inode *dest, loff_t destoff, > > + loff_t len, bool *is_same, > > + const struct iomap_ops *ops); > > static inline bool dax_mapping(struct address_space *mapping) { > > return mapping->host && IS_DAX(mapping->host); diff --git > > a/include/linux/fs.h b/include/linux/fs.h index > > c3c88fdb9b2a..e2c348553d87 100644 > > --- a/include/linux/fs.h > > +++ b/include/linux/fs.h > > @@ -71,6 +71,7 @@ struct fsverity_operations; struct fs_context; > > struct fs_parameter_spec; struct fileattr; > > +struct iomap_ops; > > > > extern void __init inode_init(void); > > extern void __init inode_init_early(void); @@ -2126,10 +2127,13 @@ > > extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file > > *, extern ssize_t generic_copy_file_range(struct file *file_in, loff_t pos_in, > > struct file *file_out, loff_t pos_out, > > size_t len, unsigned int flags); -extern int > > generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > - struct file *file_out, loff_t pos_out, > > - loff_t *count, > > - unsigned int remap_flags); > > +int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > + struct file *file_out, loff_t pos_out, > > + loff_t *count, unsigned int remap_flags); int > > +dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > + struct file *file_out, loff_t pos_out, > > + loff_t *len, unsigned int remap_flags, > > + const struct iomap_ops *ops); > > extern loff_t do_clone_file_range(struct file *file_in, loff_t pos_in, > > struct file *file_out, loff_t pos_out, > > loff_t len, unsigned int remap_flags); > > -- > > 2.31.1 > > > > > >
On Fri, May 14, 2021 at 08:35:44AM +0000, ruansy.fnst@fujitsu.com wrote: > > > > -----Original Message----- > > From: Darrick J. Wong <djwong@kernel.org> > > Subject: Re: [PATCH v5 5/7] fsdax: Dedup file range to use a compare function > > > > On Tue, May 11, 2021 at 11:09:31AM +0800, Shiyang Ruan wrote: > > > With dax we cannot deal with readpage() etc. So, we create a dax > > > comparison funciton which is similar with > > > vfs_dedupe_file_range_compare(). > > > And introduce dax_remap_file_range_prep() for filesystem use. > > > > > > Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> > > > Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com> > > > --- > > > fs/dax.c | 56 > > +++++++++++++++++++++++++++++++++++++++++++ > > > fs/remap_range.c | 57 > > +++++++++++++++++++++++++++++++++++++------- > > > fs/xfs/xfs_reflink.c | 8 +++++-- > > > include/linux/dax.h | 4 ++++ > > > include/linux/fs.h | 12 ++++++---- > > > 5 files changed, 123 insertions(+), 14 deletions(-) > > > > > > diff --git a/fs/dax.c b/fs/dax.c > > > index ee9d28a79bfb..dedf1be0155c 100644 > > > --- a/fs/dax.c > > > +++ b/fs/dax.c > > > @@ -1853,3 +1853,59 @@ vm_fault_t dax_finish_sync_fault(struct vm_fault > > *vmf, > > > return dax_insert_pfn_mkwrite(vmf, pfn, order); } > > > EXPORT_SYMBOL_GPL(dax_finish_sync_fault); > > > + > > > +static loff_t dax_range_compare_actor(struct inode *ino1, loff_t pos1, > > > + struct inode *ino2, loff_t pos2, loff_t len, void *data, > > > + struct iomap *smap, struct iomap *dmap) { > > > + void *saddr, *daddr; > > > + bool *same = data; > > > + int ret; > > > + > > > + if (smap->type == IOMAP_HOLE && dmap->type == IOMAP_HOLE) { > > > + *same = true; > > > + return len; > > > + } > > > + > > > + if (smap->type == IOMAP_HOLE || dmap->type == IOMAP_HOLE) { > > > + *same = false; > > > + return 0; > > > + } > > > + > > > + ret = dax_iomap_direct_access(smap, pos1, ALIGN(pos1 + len, PAGE_SIZE), > > > + &saddr, NULL); > > > + if (ret < 0) > > > + return -EIO; > > > + > > > + ret = dax_iomap_direct_access(dmap, pos2, ALIGN(pos2 + len, PAGE_SIZE), > > > + &daddr, NULL); > > > + if (ret < 0) > > > + return -EIO; > > > + > > > + *same = !memcmp(saddr, daddr, len); > > > + return len; > > > +} > > > + > > > +int dax_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > > > + struct inode *dest, loff_t destoff, loff_t len, bool *is_same, > > > + const struct iomap_ops *ops) > > > +{ > > > + int id, ret = 0; > > > + > > > + id = dax_read_lock(); > > > + while (len) { > > > + ret = iomap_apply2(src, srcoff, dest, destoff, len, 0, ops, > > > + is_same, dax_range_compare_actor); > > > + if (ret < 0 || !*is_same) > > > + goto out; > > > + > > > + len -= ret; > > > + srcoff += ret; > > > + destoff += ret; > > > + } > > > + ret = 0; > > > +out: > > > + dax_read_unlock(id); > > > + return ret; > > > +} > > > +EXPORT_SYMBOL_GPL(dax_dedupe_file_range_compare); > > > diff --git a/fs/remap_range.c b/fs/remap_range.c index > > > e4a5fdd7ad7b..7bc4c8e3aa9f 100644 > > > --- a/fs/remap_range.c > > > +++ b/fs/remap_range.c > > > @@ -14,6 +14,7 @@ > > > #include <linux/compat.h> > > > #include <linux/mount.h> > > > #include <linux/fs.h> > > > +#include <linux/dax.h> > > > #include "internal.h" > > > > > > #include <linux/uaccess.h> > > > @@ -199,9 +200,9 @@ static void vfs_unlock_two_pages(struct page *page1, > > struct page *page2) > > > * Compare extents of two files to see if they are the same. > > > * Caller must have locked both inodes to prevent write races. > > > */ > > > -static int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > > > - struct inode *dest, loff_t destoff, > > > - loff_t len, bool *is_same) > > > +int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > > > + struct inode *dest, loff_t destoff, > > > + loff_t len, bool *is_same) > > > { > > > loff_t src_poff; > > > loff_t dest_poff; > > > @@ -280,6 +281,7 @@ static int vfs_dedupe_file_range_compare(struct > > > inode *src, loff_t srcoff, > > > out_error: > > > return error; > > > } > > > +EXPORT_SYMBOL(vfs_dedupe_file_range_compare); > > > > > > /* > > > * Check that the two inodes are eligible for cloning, the ranges > > > make @@ -289,9 +291,11 @@ static int > > vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > > > * If there's an error, then the usual negative error code is returned. > > > * Otherwise returns 0 with *len set to the request length. > > > */ > > > -int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > > - struct file *file_out, loff_t pos_out, > > > - loff_t *len, unsigned int remap_flags) > > > +static int > > > +__generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > > + struct file *file_out, loff_t pos_out, > > > + loff_t *len, unsigned int remap_flags, > > > + const struct iomap_ops *dax_read_ops) > > > { > > > struct inode *inode_in = file_inode(file_in); > > > struct inode *inode_out = file_inode(file_out); @@ -351,8 +355,17 @@ > > > int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > > if (remap_flags & REMAP_FILE_DEDUP) { > > > bool is_same = false; > > > > > > - ret = vfs_dedupe_file_range_compare(inode_in, pos_in, > > > - inode_out, pos_out, *len, &is_same); > > > + if (!IS_DAX(inode_in)) > > > + ret = vfs_dedupe_file_range_compare(inode_in, pos_in, > > > + inode_out, pos_out, *len, &is_same); #ifdef > > CONFIG_FS_DAX > > > + else if (dax_read_ops) > > > + ret = dax_dedupe_file_range_compare(inode_in, pos_in, > > > + inode_out, pos_out, *len, &is_same, > > > + dax_read_ops); > > > +#endif /* CONFIG_FS_DAX */ > > > > Hmm, can you add an entry to the !IS_ENABLED(CONFIG_DAX) part of dax.h > > that defines dax_dedupe_file_range_compare as a dummy function that returns > > -EOPNOTSUPP? We try not to sprinkle preprocessor directives into the middle > > of functions, per Linus rules. > > I found that it's ok to build without the #ifdef and #endif here, even > though CONFIG_FS_DAX is disabled. > And like other dax functions in fs/dax.c, such as dax_iomap_rw(), it > is declared in include/linux/dax.h without IS_ENABLED() or #ifdef > wrapped. And xfs calls it directly and it won't cause build error. > So, I think I could just remove the #ifdef here, but I am not sure if > this obeys the rule. If it doesn't break the build (yay kbuild robot!) then it's probably ok. > > > > > + else > > > + return -EINVAL; > > > if (ret) > > > return ret; > > > if (!is_same) > > > @@ -370,6 +383,34 @@ int generic_remap_file_range_prep(struct file > > > *file_in, loff_t pos_in, > > > > > > return ret; > > > } > > > + > > > +#ifdef CONFIG_FS_DAX > > > +int dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > > + struct file *file_out, loff_t pos_out, > > > + loff_t *len, unsigned int remap_flags, > > > + const struct iomap_ops *ops) { > > > + return __generic_remap_file_range_prep(file_in, pos_in, file_out, > > > + pos_out, len, remap_flags, ops); } #else int > > > +dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > > + struct file *file_out, loff_t pos_out, > > > + loff_t *len, unsigned int remap_flags, > > > + const struct iomap_ops *ops) { > > > + return -EOPNOTSUPP; > > > +} > > > +#endif /* CONFIG_FS_DAX */ > > > +EXPORT_SYMBOL(dax_remap_file_range_prep); > > > > I think this symbol belongs in fs/dax.c and the declaration in dax.h? > > For the function name, it does should belong to fs/dax. But if so, > __generic_remap_file_range_prep() needs to be called in fs/dax. I > don't think this is good. Why not? FS_DAX is a boolean, so fs/dax.o will get linked into the same vmlinux file as fs/remap_range.o. --D > > > -- > Thanks, > Ruan Shiyang. > > > > > --D > > > > > +int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > > + struct file *file_out, loff_t pos_out, > > > + loff_t *len, unsigned int remap_flags) { > > > + return __generic_remap_file_range_prep(file_in, pos_in, file_out, > > > + pos_out, len, remap_flags, NULL); } > > > EXPORT_SYMBOL(generic_remap_file_range_prep); > > > > > > loff_t do_clone_file_range(struct file *file_in, loff_t pos_in, diff > > > --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index > > > 060695d6d56a..d25434f93235 100644 > > > --- a/fs/xfs/xfs_reflink.c > > > +++ b/fs/xfs/xfs_reflink.c > > > @@ -1329,8 +1329,12 @@ xfs_reflink_remap_prep( > > > if (IS_DAX(inode_in) || IS_DAX(inode_out)) > > > goto out_unlock; > > > > > > - ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out, > > > - len, remap_flags); > > > + if (!IS_DAX(inode_in)) > > > + ret = generic_remap_file_range_prep(file_in, pos_in, file_out, > > > + pos_out, len, remap_flags); > > > + else > > > + ret = dax_remap_file_range_prep(file_in, pos_in, file_out, > > > + pos_out, len, remap_flags, &xfs_read_iomap_ops); > > > if (ret || *len == 0) > > > goto out_unlock; > > > > > > diff --git a/include/linux/dax.h b/include/linux/dax.h index > > > 3275e01ed33d..32e1c34349f2 100644 > > > --- a/include/linux/dax.h > > > +++ b/include/linux/dax.h > > > @@ -239,6 +239,10 @@ int dax_invalidate_mapping_entry_sync(struct > > address_space *mapping, > > > pgoff_t index); > > > s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap, > > > struct iomap *srcmap); > > > +int dax_dedupe_file_range_compare(struct inode *src, loff_t srcoff, > > > + struct inode *dest, loff_t destoff, > > > + loff_t len, bool *is_same, > > > + const struct iomap_ops *ops); > > > static inline bool dax_mapping(struct address_space *mapping) { > > > return mapping->host && IS_DAX(mapping->host); diff --git > > > a/include/linux/fs.h b/include/linux/fs.h index > > > c3c88fdb9b2a..e2c348553d87 100644 > > > --- a/include/linux/fs.h > > > +++ b/include/linux/fs.h > > > @@ -71,6 +71,7 @@ struct fsverity_operations; struct fs_context; > > > struct fs_parameter_spec; struct fileattr; > > > +struct iomap_ops; > > > > > > extern void __init inode_init(void); > > > extern void __init inode_init_early(void); @@ -2126,10 +2127,13 @@ > > > extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file > > > *, extern ssize_t generic_copy_file_range(struct file *file_in, loff_t pos_in, > > > struct file *file_out, loff_t pos_out, > > > size_t len, unsigned int flags); -extern int > > > generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > > - struct file *file_out, loff_t pos_out, > > > - loff_t *count, > > > - unsigned int remap_flags); > > > +int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > > + struct file *file_out, loff_t pos_out, > > > + loff_t *count, unsigned int remap_flags); int > > > +dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, > > > + struct file *file_out, loff_t pos_out, > > > + loff_t *len, unsigned int remap_flags, > > > + const struct iomap_ops *ops); > > > extern loff_t do_clone_file_range(struct file *file_in, loff_t pos_in, > > > struct file *file_out, loff_t pos_out, > > > loff_t len, unsigned int remap_flags); > > > -- > > > 2.31.1 > > > > > > > > >
diff --git a/fs/dax.c b/fs/dax.c index ee9d28a79bfb..dedf1be0155c 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -1853,3 +1853,59 @@ vm_fault_t dax_finish_sync_fault(struct vm_fault *vmf, return dax_insert_pfn_mkwrite(vmf, pfn, order); } EXPORT_SYMBOL_GPL(dax_finish_sync_fault); + +static loff_t dax_range_compare_actor(struct inode *ino1, loff_t pos1, + struct inode *ino2, loff_t pos2, loff_t len, void *data, + struct iomap *smap, struct iomap *dmap) +{ + void *saddr, *daddr; + bool *same = data; + int ret; + + if (smap->type == IOMAP_HOLE && dmap->type == IOMAP_HOLE) { + *same = true; + return len; + } + + if (smap->type == IOMAP_HOLE || dmap->type == IOMAP_HOLE) { + *same = false; + return 0; + } + + ret = dax_iomap_direct_access(smap, pos1, ALIGN(pos1 + len, PAGE_SIZE), + &saddr, NULL); + if (ret < 0) + return -EIO; + + ret = dax_iomap_direct_access(dmap, pos2, ALIGN(pos2 + len, PAGE_SIZE), + &daddr, NULL); + if (ret < 0) + return -EIO; + + *same = !memcmp(saddr, daddr, len); + return len; +} + +int dax_dedupe_file_range_compare(struct inode *src, loff_t srcoff, + struct inode *dest, loff_t destoff, loff_t len, bool *is_same, + const struct iomap_ops *ops) +{ + int id, ret = 0; + + id = dax_read_lock(); + while (len) { + ret = iomap_apply2(src, srcoff, dest, destoff, len, 0, ops, + is_same, dax_range_compare_actor); + if (ret < 0 || !*is_same) + goto out; + + len -= ret; + srcoff += ret; + destoff += ret; + } + ret = 0; +out: + dax_read_unlock(id); + return ret; +} +EXPORT_SYMBOL_GPL(dax_dedupe_file_range_compare); diff --git a/fs/remap_range.c b/fs/remap_range.c index e4a5fdd7ad7b..7bc4c8e3aa9f 100644 --- a/fs/remap_range.c +++ b/fs/remap_range.c @@ -14,6 +14,7 @@ #include <linux/compat.h> #include <linux/mount.h> #include <linux/fs.h> +#include <linux/dax.h> #include "internal.h" #include <linux/uaccess.h> @@ -199,9 +200,9 @@ static void vfs_unlock_two_pages(struct page *page1, struct page *page2) * Compare extents of two files to see if they are the same. * Caller must have locked both inodes to prevent write races. */ -static int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, - struct inode *dest, loff_t destoff, - loff_t len, bool *is_same) +int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, + struct inode *dest, loff_t destoff, + loff_t len, bool *is_same) { loff_t src_poff; loff_t dest_poff; @@ -280,6 +281,7 @@ static int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, out_error: return error; } +EXPORT_SYMBOL(vfs_dedupe_file_range_compare); /* * Check that the two inodes are eligible for cloning, the ranges make @@ -289,9 +291,11 @@ static int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, * If there's an error, then the usual negative error code is returned. * Otherwise returns 0 with *len set to the request length. */ -int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, - struct file *file_out, loff_t pos_out, - loff_t *len, unsigned int remap_flags) +static int +__generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + loff_t *len, unsigned int remap_flags, + const struct iomap_ops *dax_read_ops) { struct inode *inode_in = file_inode(file_in); struct inode *inode_out = file_inode(file_out); @@ -351,8 +355,17 @@ int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, if (remap_flags & REMAP_FILE_DEDUP) { bool is_same = false; - ret = vfs_dedupe_file_range_compare(inode_in, pos_in, - inode_out, pos_out, *len, &is_same); + if (!IS_DAX(inode_in)) + ret = vfs_dedupe_file_range_compare(inode_in, pos_in, + inode_out, pos_out, *len, &is_same); +#ifdef CONFIG_FS_DAX + else if (dax_read_ops) + ret = dax_dedupe_file_range_compare(inode_in, pos_in, + inode_out, pos_out, *len, &is_same, + dax_read_ops); +#endif /* CONFIG_FS_DAX */ + else + return -EINVAL; if (ret) return ret; if (!is_same) @@ -370,6 +383,34 @@ int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, return ret; } + +#ifdef CONFIG_FS_DAX +int dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + loff_t *len, unsigned int remap_flags, + const struct iomap_ops *ops) +{ + return __generic_remap_file_range_prep(file_in, pos_in, file_out, + pos_out, len, remap_flags, ops); +} +#else +int dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + loff_t *len, unsigned int remap_flags, + const struct iomap_ops *ops) +{ + return -EOPNOTSUPP; +} +#endif /* CONFIG_FS_DAX */ +EXPORT_SYMBOL(dax_remap_file_range_prep); + +int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + loff_t *len, unsigned int remap_flags) +{ + return __generic_remap_file_range_prep(file_in, pos_in, file_out, + pos_out, len, remap_flags, NULL); +} EXPORT_SYMBOL(generic_remap_file_range_prep); loff_t do_clone_file_range(struct file *file_in, loff_t pos_in, diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 060695d6d56a..d25434f93235 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1329,8 +1329,12 @@ xfs_reflink_remap_prep( if (IS_DAX(inode_in) || IS_DAX(inode_out)) goto out_unlock; - ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out, - len, remap_flags); + if (!IS_DAX(inode_in)) + ret = generic_remap_file_range_prep(file_in, pos_in, file_out, + pos_out, len, remap_flags); + else + ret = dax_remap_file_range_prep(file_in, pos_in, file_out, + pos_out, len, remap_flags, &xfs_read_iomap_ops); if (ret || *len == 0) goto out_unlock; diff --git a/include/linux/dax.h b/include/linux/dax.h index 3275e01ed33d..32e1c34349f2 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -239,6 +239,10 @@ int dax_invalidate_mapping_entry_sync(struct address_space *mapping, pgoff_t index); s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap, struct iomap *srcmap); +int dax_dedupe_file_range_compare(struct inode *src, loff_t srcoff, + struct inode *dest, loff_t destoff, + loff_t len, bool *is_same, + const struct iomap_ops *ops); static inline bool dax_mapping(struct address_space *mapping) { return mapping->host && IS_DAX(mapping->host); diff --git a/include/linux/fs.h b/include/linux/fs.h index c3c88fdb9b2a..e2c348553d87 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -71,6 +71,7 @@ struct fsverity_operations; struct fs_context; struct fs_parameter_spec; struct fileattr; +struct iomap_ops; extern void __init inode_init(void); extern void __init inode_init_early(void); @@ -2126,10 +2127,13 @@ extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *, extern ssize_t generic_copy_file_range(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, size_t len, unsigned int flags); -extern int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, - struct file *file_out, loff_t pos_out, - loff_t *count, - unsigned int remap_flags); +int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + loff_t *count, unsigned int remap_flags); +int dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + loff_t *len, unsigned int remap_flags, + const struct iomap_ops *ops); extern loff_t do_clone_file_range(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, loff_t len, unsigned int remap_flags);