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btrfs: merge length input and output parameter in compress_pages
The length parameter is basically duplicated for input and output in the top level caller of the compress_pages chain. We can simply use one variable for that and reduce stack consumption. The compression implementation will sink the parameter to a local variable so everything works as before. Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
parent
52f75f4fe7
commit
38c3146408
5 changed files with 18 additions and 20 deletions
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@ -911,27 +911,25 @@ static void free_workspaces(void)
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}
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/*
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* given an address space and start/len, compress the bytes.
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* Given an address space and start and length, compress the bytes into @pages
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* that are allocated on demand.
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*
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* pages are allocated to hold the compressed result and stored
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* in 'pages'
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* @out_pages is used to return the number of pages allocated. There
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* may be pages allocated even if we return an error.
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*
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* out_pages is used to return the number of pages allocated. There
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* may be pages allocated even if we return an error
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*
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* total_in is used to return the number of bytes actually read. It
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* may be smaller then len if we had to exit early because we
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* @total_in is used to return the number of bytes actually read. It
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* may be smaller than the input length if we had to exit early because we
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* ran out of room in the pages array or because we cross the
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* max_out threshold.
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*
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* total_out is used to return the total number of compressed bytes
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* @total_out is an in/out parameter, must be set to the input length and will
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* be also used to return the total number of compressed bytes
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*
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* max_out tells us the max number of bytes that we're allowed to
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* @max_out tells us the max number of bytes that we're allowed to
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* stuff into pages
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*/
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int btrfs_compress_pages(int type, struct address_space *mapping,
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u64 start, unsigned long len,
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struct page **pages,
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u64 start, struct page **pages,
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unsigned long nr_dest_pages,
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unsigned long *out_pages,
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unsigned long *total_in,
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@ -944,7 +942,7 @@ int btrfs_compress_pages(int type, struct address_space *mapping,
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workspace = find_workspace(type);
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ret = btrfs_compress_op[type-1]->compress_pages(workspace, mapping,
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start, len, pages,
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start, pages,
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nr_dest_pages, out_pages,
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total_in, total_out,
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max_out);
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@ -23,8 +23,7 @@ void btrfs_init_compress(void);
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void btrfs_exit_compress(void);
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int btrfs_compress_pages(int type, struct address_space *mapping,
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u64 start, unsigned long len,
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struct page **pages,
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u64 start, struct page **pages,
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unsigned long nr_dest_pages,
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unsigned long *out_pages,
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unsigned long *total_in,
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@ -59,7 +58,7 @@ struct btrfs_compress_op {
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int (*compress_pages)(struct list_head *workspace,
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struct address_space *mapping,
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u64 start, unsigned long len,
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u64 start,
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struct page **pages,
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unsigned long nr_dest_pages,
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unsigned long *out_pages,
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@ -517,7 +517,7 @@ static noinline void compress_file_range(struct inode *inode,
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redirty = 1;
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ret = btrfs_compress_pages(compress_type,
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inode->i_mapping, start,
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total_compressed, pages,
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pages,
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nr_pages, &nr_pages_ret,
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&total_in,
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&total_compressed,
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@ -86,7 +86,7 @@ static inline size_t read_compress_length(const char *buf)
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static int lzo_compress_pages(struct list_head *ws,
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struct address_space *mapping,
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u64 start, unsigned long len,
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u64 start,
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struct page **pages,
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unsigned long nr_dest_pages,
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unsigned long *out_pages,
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@ -102,7 +102,7 @@ static int lzo_compress_pages(struct list_head *ws,
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struct page *in_page = NULL;
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struct page *out_page = NULL;
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unsigned long bytes_left;
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unsigned long len = *total_out;
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size_t in_len;
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size_t out_len;
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char *buf;
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@ -73,7 +73,7 @@ static struct list_head *zlib_alloc_workspace(void)
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static int zlib_compress_pages(struct list_head *ws,
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struct address_space *mapping,
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u64 start, unsigned long len,
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u64 start,
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struct page **pages,
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unsigned long nr_dest_pages,
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unsigned long *out_pages,
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@ -89,6 +89,7 @@ static int zlib_compress_pages(struct list_head *ws,
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struct page *in_page = NULL;
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struct page *out_page = NULL;
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unsigned long bytes_left;
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unsigned long len = *total_out;
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*out_pages = 0;
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*total_out = 0;
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