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author | David Teigland <teigland@redhat.com> | 2006-01-16 16:50:04 +0000 |
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committer | Steven Whitehouse <swhiteho@redhat.com> | 2006-01-16 16:50:04 +0000 |
commit | b3b94faa5fe5968827ba0640ee9fba4b3e7f736e (patch) | |
tree | 70bd6068b050d2c46e338484f8b03fae4365c6c3 /fs/gfs2/page.c | |
parent | f7825dcf8c7301cfd3724eb40c5b443cc85ab7b8 (diff) | |
download | linux-stable-b3b94faa5fe5968827ba0640ee9fba4b3e7f736e.tar.gz linux-stable-b3b94faa5fe5968827ba0640ee9fba4b3e7f736e.tar.bz2 linux-stable-b3b94faa5fe5968827ba0640ee9fba4b3e7f736e.zip |
[GFS2] The core of GFS2
This patch contains all the core files for GFS2.
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/page.c')
-rw-r--r-- | fs/gfs2/page.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/fs/gfs2/page.c b/fs/gfs2/page.c new file mode 100644 index 000000000000..05453c5a06f0 --- /dev/null +++ b/fs/gfs2/page.c @@ -0,0 +1,273 @@ +/* + * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. + * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. + * + * This copyrighted material is made available to anyone wishing to use, + * modify, copy, or redistribute it subject to the terms and conditions + * of the GNU General Public License v.2. + */ + +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/completion.h> +#include <linux/buffer_head.h> +#include <linux/pagemap.h> +#include <linux/mm.h> +#include <asm/semaphore.h> + +#include "gfs2.h" +#include "bmap.h" +#include "inode.h" +#include "page.h" +#include "trans.h" + +/** + * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock + * @gl: the glock + * + */ + +void gfs2_pte_inval(struct gfs2_glock *gl) +{ + struct gfs2_inode *ip; + struct inode *inode; + + ip = get_gl2ip(gl); + if (!ip || !S_ISREG(ip->i_di.di_mode)) + return; + + if (!test_bit(GIF_PAGED, &ip->i_flags)) + return; + + inode = gfs2_ip2v_lookup(ip); + if (inode) { + unmap_shared_mapping_range(inode->i_mapping, 0, 0); + iput(inode); + + if (test_bit(GIF_SW_PAGED, &ip->i_flags)) + set_bit(GLF_DIRTY, &gl->gl_flags); + } + + clear_bit(GIF_SW_PAGED, &ip->i_flags); +} + +/** + * gfs2_page_inval - Invalidate all pages associated with a glock + * @gl: the glock + * + */ + +void gfs2_page_inval(struct gfs2_glock *gl) +{ + struct gfs2_inode *ip; + struct inode *inode; + + ip = get_gl2ip(gl); + if (!ip || !S_ISREG(ip->i_di.di_mode)) + return; + + inode = gfs2_ip2v_lookup(ip); + if (inode) { + struct address_space *mapping = inode->i_mapping; + + truncate_inode_pages(mapping, 0); + gfs2_assert_withdraw(ip->i_sbd, !mapping->nrpages); + + iput(inode); + } + + clear_bit(GIF_PAGED, &ip->i_flags); +} + +/** + * gfs2_page_sync - Sync the data pages (not metadata) associated with a glock + * @gl: the glock + * @flags: DIO_START | DIO_WAIT + * + * Syncs data (not metadata) for a regular file. + * No-op for all other types. + */ + +void gfs2_page_sync(struct gfs2_glock *gl, int flags) +{ + struct gfs2_inode *ip; + struct inode *inode; + + ip = get_gl2ip(gl); + if (!ip || !S_ISREG(ip->i_di.di_mode)) + return; + + inode = gfs2_ip2v_lookup(ip); + if (inode) { + struct address_space *mapping = inode->i_mapping; + int error = 0; + + if (flags & DIO_START) + filemap_fdatawrite(mapping); + if (!error && (flags & DIO_WAIT)) + error = filemap_fdatawait(mapping); + + /* Put back any errors cleared by filemap_fdatawait() + so they can be caught by someone who can pass them + up to user space. */ + + if (error == -ENOSPC) + set_bit(AS_ENOSPC, &mapping->flags); + else if (error) + set_bit(AS_EIO, &mapping->flags); + + iput(inode); + } +} + +/** + * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page + * @ip: the inode + * @dibh: the dinode buffer + * @block: the block number that was allocated + * @private: any locked page held by the caller process + * + * Returns: errno + */ + +int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh, + uint64_t block, void *private) +{ + struct gfs2_sbd *sdp = ip->i_sbd; + struct inode *inode = ip->i_vnode; + struct page *page = (struct page *)private; + struct buffer_head *bh; + int release = 0; + + if (!page || page->index) { + page = grab_cache_page(inode->i_mapping, 0); + if (!page) + return -ENOMEM; + release = 1; + } + + if (!PageUptodate(page)) { + void *kaddr = kmap(page); + + memcpy(kaddr, + dibh->b_data + sizeof(struct gfs2_dinode), + ip->i_di.di_size); + memset(kaddr + ip->i_di.di_size, + 0, + PAGE_CACHE_SIZE - ip->i_di.di_size); + kunmap(page); + + SetPageUptodate(page); + } + + if (!page_has_buffers(page)) + create_empty_buffers(page, 1 << inode->i_blkbits, + (1 << BH_Uptodate)); + + bh = page_buffers(page); + + if (!buffer_mapped(bh)) + map_bh(bh, inode->i_sb, block); + + set_buffer_uptodate(bh); + if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED) + gfs2_trans_add_databuf(sdp, bh); + mark_buffer_dirty(bh); + + if (release) { + unlock_page(page); + page_cache_release(page); + } + + return 0; +} + +/** + * gfs2_truncator_page - truncate a partial data block in the page cache + * @ip: the inode + * @size: the size the file should be + * + * Returns: errno + */ + +int gfs2_truncator_page(struct gfs2_inode *ip, uint64_t size) +{ + struct gfs2_sbd *sdp = ip->i_sbd; + struct inode *inode = ip->i_vnode; + struct page *page; + struct buffer_head *bh; + void *kaddr; + uint64_t lbn, dbn; + unsigned long index; + unsigned int offset; + unsigned int bufnum; + int new = 0; + int error; + + lbn = size >> inode->i_blkbits; + error = gfs2_block_map(ip, lbn, &new, &dbn, NULL); + if (error || !dbn) + return error; + + index = size >> PAGE_CACHE_SHIFT; + offset = size & (PAGE_CACHE_SIZE - 1); + bufnum = lbn - (index << (PAGE_CACHE_SHIFT - inode->i_blkbits)); + + page = read_cache_page(inode->i_mapping, index, + (filler_t *)inode->i_mapping->a_ops->readpage, + NULL); + if (IS_ERR(page)) + return PTR_ERR(page); + + lock_page(page); + + if (!PageUptodate(page) || PageError(page)) { + error = -EIO; + goto out; + } + + kaddr = kmap(page); + memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); + kunmap(page); + + if (!page_has_buffers(page)) + create_empty_buffers(page, 1 << inode->i_blkbits, + (1 << BH_Uptodate)); + + for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page) + /* Do nothing */; + + if (!buffer_mapped(bh)) + map_bh(bh, inode->i_sb, dbn); + + set_buffer_uptodate(bh); + if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED) + gfs2_trans_add_databuf(sdp, bh); + mark_buffer_dirty(bh); + + out: + unlock_page(page); + page_cache_release(page); + + return error; +} + +void gfs2_page_add_databufs(struct gfs2_sbd *sdp, struct page *page, + unsigned int from, unsigned int to) +{ + struct buffer_head *head = page_buffers(page); + unsigned int bsize = head->b_size; + struct buffer_head *bh; + unsigned int start, end; + + for (bh = head, start = 0; + bh != head || !start; + bh = bh->b_this_page, start = end) { + end = start + bsize; + if (end <= from || start >= to) + continue; + gfs2_trans_add_databuf(sdp, bh); + } +} + |