diff options
Diffstat (limited to 'fs/gfs2/lops.c')
| -rw-r--r-- | fs/gfs2/lops.c | 263 |
1 files changed, 239 insertions, 24 deletions
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c index 8722c60b11fe..33ab662c9aac 100644 --- a/fs/gfs2/lops.c +++ b/fs/gfs2/lops.c @@ -17,7 +17,9 @@ #include <linux/bio.h> #include <linux/fs.h> #include <linux/list_sort.h> +#include <linux/blkdev.h> +#include "bmap.h" #include "dir.h" #include "gfs2.h" #include "incore.h" @@ -194,7 +196,6 @@ static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp, /** * gfs2_end_log_write - end of i/o to the log * @bio: The bio - * @error: Status of i/o request * * Each bio_vec contains either data from the pagecache or data * relating to the log itself. Here we iterate over the bio_vec @@ -207,7 +208,6 @@ static void gfs2_end_log_write(struct bio *bio) struct gfs2_sbd *sdp = bio->bi_private; struct bio_vec *bvec; struct page *page; - int i; struct bvec_iter_all iter_all; if (bio->bi_status) { @@ -216,7 +216,7 @@ static void gfs2_end_log_write(struct bio *bio) wake_up(&sdp->sd_logd_waitq); } - bio_for_each_segment_all(bvec, bio, i, iter_all) { + bio_for_each_segment_all(bvec, bio, iter_all) { page = bvec->bv_page; if (page_has_buffers(page)) gfs2_end_log_write_bh(sdp, bvec, bio->bi_status); @@ -232,20 +232,19 @@ static void gfs2_end_log_write(struct bio *bio) /** * gfs2_log_submit_bio - Submit any pending log bio * @biop: Address of the bio pointer - * @op: REQ_OP - * @op_flags: req_flag_bits + * @opf: REQ_OP | op_flags * * Submit any pending part-built or full bio to the block device. If * there is no pending bio, then this is a no-op. */ -void gfs2_log_submit_bio(struct bio **biop, int op, int op_flags) +void gfs2_log_submit_bio(struct bio **biop, int opf) { struct bio *bio = *biop; if (bio) { struct gfs2_sbd *sdp = bio->bi_private; atomic_inc(&sdp->sd_log_in_flight); - bio_set_op_attrs(bio, op, op_flags); + bio->bi_opf = opf; submit_bio(bio); *biop = NULL; } @@ -306,7 +305,7 @@ static struct bio *gfs2_log_get_bio(struct gfs2_sbd *sdp, u64 blkno, nblk >>= sdp->sd_fsb2bb_shift; if (blkno == nblk && !flush) return bio; - gfs2_log_submit_bio(biop, op, 0); + gfs2_log_submit_bio(biop, op); } *biop = gfs2_log_alloc_bio(sdp, blkno, end_io); @@ -377,6 +376,205 @@ void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page) gfs2_log_bmap(sdp)); } +/** + * gfs2_end_log_read - end I/O callback for reads from the log + * @bio: The bio + * + * Simply unlock the pages in the bio. The main thread will wait on them and + * process them in order as necessary. + */ + +static void gfs2_end_log_read(struct bio *bio) +{ + struct page *page; + struct bio_vec *bvec; + struct bvec_iter_all iter_all; + + bio_for_each_segment_all(bvec, bio, iter_all) { + page = bvec->bv_page; + if (bio->bi_status) { + int err = blk_status_to_errno(bio->bi_status); + + SetPageError(page); + mapping_set_error(page->mapping, err); + } + unlock_page(page); + } + + bio_put(bio); +} + +/** + * gfs2_jhead_pg_srch - Look for the journal head in a given page. + * @jd: The journal descriptor + * @page: The page to look in + * + * Returns: 1 if found, 0 otherwise. + */ + +static bool gfs2_jhead_pg_srch(struct gfs2_jdesc *jd, + struct gfs2_log_header_host *head, + struct page *page) +{ + struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); + struct gfs2_log_header_host uninitialized_var(lh); + void *kaddr = kmap_atomic(page); + unsigned int offset; + bool ret = false; + + for (offset = 0; offset < PAGE_SIZE; offset += sdp->sd_sb.sb_bsize) { + if (!__get_log_header(sdp, kaddr + offset, 0, &lh)) { + if (lh.lh_sequence > head->lh_sequence) + *head = lh; + else { + ret = true; + break; + } + } + } + kunmap_atomic(kaddr); + return ret; +} + +/** + * gfs2_jhead_process_page - Search/cleanup a page + * @jd: The journal descriptor + * @index: Index of the page to look into + * @done: If set, perform only cleanup, else search and set if found. + * + * Find the page with 'index' in the journal's mapping. Search the page for + * the journal head if requested (cleanup == false). Release refs on the + * page so the page cache can reclaim it (put_page() twice). We grabbed a + * reference on this page two times, first when we did a find_or_create_page() + * to obtain the page to add it to the bio and second when we do a + * find_get_page() here to get the page to wait on while I/O on it is being + * completed. + * This function is also used to free up a page we might've grabbed but not + * used. Maybe we added it to a bio, but not submitted it for I/O. Or we + * submitted the I/O, but we already found the jhead so we only need to drop + * our references to the page. + */ + +static void gfs2_jhead_process_page(struct gfs2_jdesc *jd, unsigned long index, + struct gfs2_log_header_host *head, + bool *done) +{ + struct page *page; + + page = find_get_page(jd->jd_inode->i_mapping, index); + wait_on_page_locked(page); + + if (PageError(page)) + *done = true; + + if (!*done) + *done = gfs2_jhead_pg_srch(jd, head, page); + + put_page(page); /* Once for find_get_page */ + put_page(page); /* Once more for find_or_create_page */ +} + +/** + * gfs2_find_jhead - find the head of a log + * @jd: The journal descriptor + * @head: The log descriptor for the head of the log is returned here + * + * Do a search of a journal by reading it in large chunks using bios and find + * the valid log entry with the highest sequence number. (i.e. the log head) + * + * Returns: 0 on success, errno otherwise + */ +int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header_host *head, + bool keep_cache) +{ + struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); + struct address_space *mapping = jd->jd_inode->i_mapping; + unsigned int block = 0, blocks_submitted = 0, blocks_read = 0; + unsigned int bsize = sdp->sd_sb.sb_bsize; + unsigned int bsize_shift = sdp->sd_sb.sb_bsize_shift; + unsigned int shift = PAGE_SHIFT - bsize_shift; + unsigned int readhead_blocks = BIO_MAX_PAGES << shift; + struct gfs2_journal_extent *je; + int sz, ret = 0; + struct bio *bio = NULL; + struct page *page = NULL; + bool done = false; + errseq_t since; + + memset(head, 0, sizeof(*head)); + if (list_empty(&jd->extent_list)) + gfs2_map_journal_extents(sdp, jd); + + since = filemap_sample_wb_err(mapping); + list_for_each_entry(je, &jd->extent_list, list) { + for (; block < je->lblock + je->blocks; block++) { + u64 dblock; + + if (!page) { + page = find_or_create_page(mapping, + block >> shift, GFP_NOFS); + if (!page) { + ret = -ENOMEM; + done = true; + goto out; + } + } + + if (bio) { + unsigned int off; + + off = (block << bsize_shift) & ~PAGE_MASK; + sz = bio_add_page(bio, page, bsize, off); + if (sz == bsize) { /* block added */ + if (off + bsize == PAGE_SIZE) { + page = NULL; + goto page_added; + } + continue; + } + blocks_submitted = block + 1; + submit_bio(bio); + bio = NULL; + } + + dblock = je->dblock + (block - je->lblock); + bio = gfs2_log_alloc_bio(sdp, dblock, gfs2_end_log_read); + bio->bi_opf = REQ_OP_READ; + sz = bio_add_page(bio, page, bsize, 0); + gfs2_assert_warn(sdp, sz == bsize); + if (bsize == PAGE_SIZE) + page = NULL; + +page_added: + if (blocks_submitted < blocks_read + readhead_blocks) { + /* Keep at least one bio in flight */ + continue; + } + + gfs2_jhead_process_page(jd, blocks_read >> shift, head, &done); + blocks_read += PAGE_SIZE >> bsize_shift; + if (done) + goto out; /* found */ + } + } + +out: + if (bio) + submit_bio(bio); + while (blocks_read < block) { + gfs2_jhead_process_page(jd, blocks_read >> shift, head, &done); + blocks_read += PAGE_SIZE >> bsize_shift; + } + + if (!ret) + ret = filemap_check_wb_err(mapping, since); + + if (!keep_cache) + truncate_inode_pages(mapping, 0); + + return ret; +} + static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type, u32 ld_length, u32 ld_data1) { @@ -530,7 +728,7 @@ static void buf_lo_before_scan(struct gfs2_jdesc *jd, jd->jd_replayed_blocks = 0; } -static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start, +static int buf_lo_scan_elements(struct gfs2_jdesc *jd, u32 start, struct gfs2_log_descriptor *ld, __be64 *ptr, int pass) { @@ -623,7 +821,7 @@ static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) { struct gfs2_meta_header *mh; unsigned int offset; - struct list_head *head = &sdp->sd_log_le_revoke; + struct list_head *head = &sdp->sd_log_revokes; struct gfs2_bufdata *bd; struct page *page; unsigned int length; @@ -661,18 +859,35 @@ static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) { - struct list_head *head = &sdp->sd_log_le_revoke; - struct gfs2_bufdata *bd; - struct gfs2_glock *gl; + struct list_head *head = &sdp->sd_log_revokes; + struct gfs2_bufdata *bd, *tmp; - while (!list_empty(head)) { - bd = list_entry(head->next, struct gfs2_bufdata, bd_list); - list_del_init(&bd->bd_list); - gl = bd->bd_gl; - atomic_dec(&gl->gl_revokes); - clear_bit(GLF_LFLUSH, &gl->gl_flags); + /* + * Glocks can be referenced repeatedly on the revoke list, but the list + * only holds one reference. All glocks on the list will have the + * GLF_REVOKES flag set initially. + */ + + list_for_each_entry_safe(bd, tmp, head, bd_list) { + struct gfs2_glock *gl = bd->bd_gl; + + if (test_bit(GLF_REVOKES, &gl->gl_flags)) { + /* Keep each glock on the list exactly once. */ + clear_bit(GLF_REVOKES, &gl->gl_flags); + continue; + } + list_del(&bd->bd_list); kmem_cache_free(gfs2_bufdata_cachep, bd); } + list_for_each_entry_safe(bd, tmp, head, bd_list) { + struct gfs2_glock *gl = bd->bd_gl; + + list_del(&bd->bd_list); + kmem_cache_free(gfs2_bufdata_cachep, bd); + clear_bit(GLF_LFLUSH, &gl->gl_flags); + gfs2_glock_queue_put(gl); + } + /* the list is empty now */ } static void revoke_lo_before_scan(struct gfs2_jdesc *jd, @@ -685,7 +900,7 @@ static void revoke_lo_before_scan(struct gfs2_jdesc *jd, jd->jd_replay_tail = head->lh_tail; } -static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start, +static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, u32 start, struct gfs2_log_descriptor *ld, __be64 *ptr, int pass) { @@ -767,7 +982,7 @@ static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1); } -static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start, +static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, u32 start, struct gfs2_log_descriptor *ld, __be64 *ptr, int pass) { @@ -853,7 +1068,7 @@ static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) } -const struct gfs2_log_operations gfs2_buf_lops = { +static const struct gfs2_log_operations gfs2_buf_lops = { .lo_before_commit = buf_lo_before_commit, .lo_after_commit = buf_lo_after_commit, .lo_before_scan = buf_lo_before_scan, @@ -862,7 +1077,7 @@ const struct gfs2_log_operations gfs2_buf_lops = { .lo_name = "buf", }; -const struct gfs2_log_operations gfs2_revoke_lops = { +static const struct gfs2_log_operations gfs2_revoke_lops = { .lo_before_commit = revoke_lo_before_commit, .lo_after_commit = revoke_lo_after_commit, .lo_before_scan = revoke_lo_before_scan, @@ -871,7 +1086,7 @@ const struct gfs2_log_operations gfs2_revoke_lops = { .lo_name = "revoke", }; -const struct gfs2_log_operations gfs2_databuf_lops = { +static const struct gfs2_log_operations gfs2_databuf_lops = { .lo_before_commit = databuf_lo_before_commit, .lo_after_commit = databuf_lo_after_commit, .lo_scan_elements = databuf_lo_scan_elements, |