linux-imx

// SPDX-License-Identifier: GPL-2.0

/* Maximum size of each resync request */

#define RESYNC_BLOCK_SIZE (64*1024)

#define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE)

​

/* for managing resync I/O pages */

struct resync_pages {

    void        *raid_bio;

    struct page *pages[RESYNC_PAGES];

};

​

static inline int resync_alloc_pages(struct resync_pages *rp,

                     gfp_t gfp_flags)

{

    int i;

​

    for (i = 0; i < RESYNC_PAGES; i++) {

        rp->pages[i] = alloc_page(gfp_flags);

        if (!rp->pages[i])

            goto out_free;

    }

​

    return 0;

​

out_free:

    while (--i >= 0)

        put_page(rp->pages[i]);

    return -ENOMEM;

}

​

static inline void resync_free_pages(struct resync_pages *rp)

{

    int i;

​

    for (i = 0; i < RESYNC_PAGES; i++)

        put_page(rp->pages[i]);

}

​

static inline void resync_get_all_pages(struct resync_pages *rp)

{

    int i;

​

    for (i = 0; i < RESYNC_PAGES; i++)

        get_page(rp->pages[i]);

}

​

static inline struct page *resync_fetch_page(struct resync_pages *rp,

                         unsigned idx)

{

    if (WARN_ON_ONCE(idx >= RESYNC_PAGES))

        return NULL;

    return rp->pages[idx];

}

​

/*

 * 'strct resync_pages' stores actual pages used for doing the resync

 *  IO, and it is per-bio, so make .bi_private points to it.

 */

static inline struct resync_pages *get_resync_pages(struct bio *bio)

{

    return bio->bi_private;

}

​