diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ocfs2/buffer_head_io.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ocfs2/buffer_head_io.c | 429 |
1 files changed, 0 insertions, 429 deletions
diff --git a/ANDROID_3.4.5/fs/ocfs2/buffer_head_io.c b/ANDROID_3.4.5/fs/ocfs2/buffer_head_io.c deleted file mode 100644 index 5d18ad10..00000000 --- a/ANDROID_3.4.5/fs/ocfs2/buffer_head_io.c +++ /dev/null @@ -1,429 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * io.c - * - * Buffer cache handling - * - * Copyright (C) 2002, 2004 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - */ - -#include <linux/fs.h> -#include <linux/types.h> -#include <linux/highmem.h> - -#include <cluster/masklog.h> - -#include "ocfs2.h" - -#include "alloc.h" -#include "inode.h" -#include "journal.h" -#include "uptodate.h" -#include "buffer_head_io.h" -#include "ocfs2_trace.h" - -/* - * Bits on bh->b_state used by ocfs2. - * - * These MUST be after the JBD2 bits. Hence, we use BH_JBDPrivateStart. - */ -enum ocfs2_state_bits { - BH_NeedsValidate = BH_JBDPrivateStart, -}; - -/* Expand the magic b_state functions */ -BUFFER_FNS(NeedsValidate, needs_validate); - -int ocfs2_write_block(struct ocfs2_super *osb, struct buffer_head *bh, - struct ocfs2_caching_info *ci) -{ - int ret = 0; - - trace_ocfs2_write_block((unsigned long long)bh->b_blocknr, ci); - - BUG_ON(bh->b_blocknr < OCFS2_SUPER_BLOCK_BLKNO); - BUG_ON(buffer_jbd(bh)); - - /* No need to check for a soft readonly file system here. non - * journalled writes are only ever done on system files which - * can get modified during recovery even if read-only. */ - if (ocfs2_is_hard_readonly(osb)) { - ret = -EROFS; - mlog_errno(ret); - goto out; - } - - ocfs2_metadata_cache_io_lock(ci); - - lock_buffer(bh); - set_buffer_uptodate(bh); - - /* remove from dirty list before I/O. */ - clear_buffer_dirty(bh); - - get_bh(bh); /* for end_buffer_write_sync() */ - bh->b_end_io = end_buffer_write_sync; - submit_bh(WRITE, bh); - - wait_on_buffer(bh); - - if (buffer_uptodate(bh)) { - ocfs2_set_buffer_uptodate(ci, bh); - } else { - /* We don't need to remove the clustered uptodate - * information for this bh as it's not marked locally - * uptodate. */ - ret = -EIO; - put_bh(bh); - mlog_errno(ret); - } - - ocfs2_metadata_cache_io_unlock(ci); -out: - return ret; -} - -int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block, - unsigned int nr, struct buffer_head *bhs[]) -{ - int status = 0; - unsigned int i; - struct buffer_head *bh; - - trace_ocfs2_read_blocks_sync((unsigned long long)block, nr); - - if (!nr) - goto bail; - - for (i = 0 ; i < nr ; i++) { - if (bhs[i] == NULL) { - bhs[i] = sb_getblk(osb->sb, block++); - if (bhs[i] == NULL) { - status = -EIO; - mlog_errno(status); - goto bail; - } - } - bh = bhs[i]; - - if (buffer_jbd(bh)) { - trace_ocfs2_read_blocks_sync_jbd( - (unsigned long long)bh->b_blocknr); - continue; - } - - if (buffer_dirty(bh)) { - /* This should probably be a BUG, or - * at least return an error. */ - mlog(ML_ERROR, - "trying to sync read a dirty " - "buffer! (blocknr = %llu), skipping\n", - (unsigned long long)bh->b_blocknr); - continue; - } - - lock_buffer(bh); - if (buffer_jbd(bh)) { - mlog(ML_ERROR, - "block %llu had the JBD bit set " - "while I was in lock_buffer!", - (unsigned long long)bh->b_blocknr); - BUG(); - } - - clear_buffer_uptodate(bh); - get_bh(bh); /* for end_buffer_read_sync() */ - bh->b_end_io = end_buffer_read_sync; - submit_bh(READ, bh); - } - - for (i = nr; i > 0; i--) { - bh = bhs[i - 1]; - - /* No need to wait on the buffer if it's managed by JBD. */ - if (!buffer_jbd(bh)) - wait_on_buffer(bh); - - if (!buffer_uptodate(bh)) { - /* Status won't be cleared from here on out, - * so we can safely record this and loop back - * to cleanup the other buffers. */ - status = -EIO; - put_bh(bh); - bhs[i - 1] = NULL; - } - } - -bail: - return status; -} - -int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr, - struct buffer_head *bhs[], int flags, - int (*validate)(struct super_block *sb, - struct buffer_head *bh)) -{ - int status = 0; - int i, ignore_cache = 0; - struct buffer_head *bh; - struct super_block *sb = ocfs2_metadata_cache_get_super(ci); - - trace_ocfs2_read_blocks_begin(ci, (unsigned long long)block, nr, flags); - - BUG_ON(!ci); - BUG_ON((flags & OCFS2_BH_READAHEAD) && - (flags & OCFS2_BH_IGNORE_CACHE)); - - if (bhs == NULL) { - status = -EINVAL; - mlog_errno(status); - goto bail; - } - - if (nr < 0) { - mlog(ML_ERROR, "asked to read %d blocks!\n", nr); - status = -EINVAL; - mlog_errno(status); - goto bail; - } - - if (nr == 0) { - status = 0; - goto bail; - } - - ocfs2_metadata_cache_io_lock(ci); - for (i = 0 ; i < nr ; i++) { - if (bhs[i] == NULL) { - bhs[i] = sb_getblk(sb, block++); - if (bhs[i] == NULL) { - ocfs2_metadata_cache_io_unlock(ci); - status = -EIO; - mlog_errno(status); - goto bail; - } - } - bh = bhs[i]; - ignore_cache = (flags & OCFS2_BH_IGNORE_CACHE); - - /* There are three read-ahead cases here which we need to - * be concerned with. All three assume a buffer has - * previously been submitted with OCFS2_BH_READAHEAD - * and it hasn't yet completed I/O. - * - * 1) The current request is sync to disk. This rarely - * happens these days, and never when performance - * matters - the code can just wait on the buffer - * lock and re-submit. - * - * 2) The current request is cached, but not - * readahead. ocfs2_buffer_uptodate() will return - * false anyway, so we'll wind up waiting on the - * buffer lock to do I/O. We re-check the request - * with after getting the lock to avoid a re-submit. - * - * 3) The current request is readahead (and so must - * also be a caching one). We short circuit if the - * buffer is locked (under I/O) and if it's in the - * uptodate cache. The re-check from #2 catches the - * case that the previous read-ahead completes just - * before our is-it-in-flight check. - */ - - if (!ignore_cache && !ocfs2_buffer_uptodate(ci, bh)) { - trace_ocfs2_read_blocks_from_disk( - (unsigned long long)bh->b_blocknr, - (unsigned long long)ocfs2_metadata_cache_owner(ci)); - /* We're using ignore_cache here to say - * "go to disk" */ - ignore_cache = 1; - } - - trace_ocfs2_read_blocks_bh((unsigned long long)bh->b_blocknr, - ignore_cache, buffer_jbd(bh), buffer_dirty(bh)); - - if (buffer_jbd(bh)) { - continue; - } - - if (ignore_cache) { - if (buffer_dirty(bh)) { - /* This should probably be a BUG, or - * at least return an error. */ - continue; - } - - /* A read-ahead request was made - if the - * buffer is already under read-ahead from a - * previously submitted request than we are - * done here. */ - if ((flags & OCFS2_BH_READAHEAD) - && ocfs2_buffer_read_ahead(ci, bh)) - continue; - - lock_buffer(bh); - if (buffer_jbd(bh)) { -#ifdef CATCH_BH_JBD_RACES - mlog(ML_ERROR, "block %llu had the JBD bit set " - "while I was in lock_buffer!", - (unsigned long long)bh->b_blocknr); - BUG(); -#else - unlock_buffer(bh); - continue; -#endif - } - - /* Re-check ocfs2_buffer_uptodate() as a - * previously read-ahead buffer may have - * completed I/O while we were waiting for the - * buffer lock. */ - if (!(flags & OCFS2_BH_IGNORE_CACHE) - && !(flags & OCFS2_BH_READAHEAD) - && ocfs2_buffer_uptodate(ci, bh)) { - unlock_buffer(bh); - continue; - } - - clear_buffer_uptodate(bh); - get_bh(bh); /* for end_buffer_read_sync() */ - if (validate) - set_buffer_needs_validate(bh); - bh->b_end_io = end_buffer_read_sync; - submit_bh(READ, bh); - continue; - } - } - - status = 0; - - for (i = (nr - 1); i >= 0; i--) { - bh = bhs[i]; - - if (!(flags & OCFS2_BH_READAHEAD)) { - /* We know this can't have changed as we hold the - * owner sem. Avoid doing any work on the bh if the - * journal has it. */ - if (!buffer_jbd(bh)) - wait_on_buffer(bh); - - if (!buffer_uptodate(bh)) { - /* Status won't be cleared from here on out, - * so we can safely record this and loop back - * to cleanup the other buffers. Don't need to - * remove the clustered uptodate information - * for this bh as it's not marked locally - * uptodate. */ - status = -EIO; - put_bh(bh); - bhs[i] = NULL; - continue; - } - - if (buffer_needs_validate(bh)) { - /* We never set NeedsValidate if the - * buffer was held by the journal, so - * that better not have changed */ - BUG_ON(buffer_jbd(bh)); - clear_buffer_needs_validate(bh); - status = validate(sb, bh); - if (status) { - put_bh(bh); - bhs[i] = NULL; - continue; - } - } - } - - /* Always set the buffer in the cache, even if it was - * a forced read, or read-ahead which hasn't yet - * completed. */ - ocfs2_set_buffer_uptodate(ci, bh); - } - ocfs2_metadata_cache_io_unlock(ci); - - trace_ocfs2_read_blocks_end((unsigned long long)block, nr, - flags, ignore_cache); - -bail: - - return status; -} - -/* Check whether the blkno is the super block or one of the backups. */ -static void ocfs2_check_super_or_backup(struct super_block *sb, - sector_t blkno) -{ - int i; - u64 backup_blkno; - - if (blkno == OCFS2_SUPER_BLOCK_BLKNO) - return; - - for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) { - backup_blkno = ocfs2_backup_super_blkno(sb, i); - if (backup_blkno == blkno) - return; - } - - BUG(); -} - -/* - * Write super block and backups doesn't need to collaborate with journal, - * so we don't need to lock ip_io_mutex and ci doesn't need to bea passed - * into this function. - */ -int ocfs2_write_super_or_backup(struct ocfs2_super *osb, - struct buffer_head *bh) -{ - int ret = 0; - struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data; - - BUG_ON(buffer_jbd(bh)); - ocfs2_check_super_or_backup(osb->sb, bh->b_blocknr); - - if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) { - ret = -EROFS; - mlog_errno(ret); - goto out; - } - - lock_buffer(bh); - set_buffer_uptodate(bh); - - /* remove from dirty list before I/O. */ - clear_buffer_dirty(bh); - - get_bh(bh); /* for end_buffer_write_sync() */ - bh->b_end_io = end_buffer_write_sync; - ocfs2_compute_meta_ecc(osb->sb, bh->b_data, &di->i_check); - submit_bh(WRITE, bh); - - wait_on_buffer(bh); - - if (!buffer_uptodate(bh)) { - ret = -EIO; - put_bh(bh); - mlog_errno(ret); - } - -out: - return ret; -} |