diff options
Diffstat (limited to 'fs/gfs2')
| -rw-r--r-- | fs/gfs2/inode.c | 1 | ||||
| -rw-r--r-- | fs/gfs2/ops_address.c | 151 | ||||
| -rw-r--r-- | fs/gfs2/ops_address.h | 3 | ||||
| -rw-r--r-- | fs/gfs2/ops_file.c | 45 | ||||
| -rw-r--r-- | fs/gfs2/ops_file.h | 24 | ||||
| -rw-r--r-- | fs/gfs2/ops_inode.h | 4 | ||||
| -rw-r--r-- | fs/gfs2/quota.c | 7 | ||||
| -rw-r--r-- | fs/gfs2/rgrp.c | 2 |
8 files changed, 111 insertions, 126 deletions
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c index 5f6dc32946cd..ad0fe373dca5 100644 --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -31,7 +31,6 @@ #include "log.h" #include "meta_io.h" #include "ops_address.h" -#include "ops_file.h" #include "ops_inode.h" #include "quota.h" #include "rgrp.h" diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c index 9679f8b9870d..9bb24b1d9c05 100644 --- a/fs/gfs2/ops_address.c +++ b/fs/gfs2/ops_address.c @@ -20,6 +20,7 @@ #include <linux/swap.h> #include <linux/gfs2_ondisk.h> #include <linux/lm_interface.h> +#include <linux/swap.h> #include "gfs2.h" #include "incore.h" @@ -32,7 +33,6 @@ #include "quota.h" #include "trans.h" #include "rgrp.h" -#include "ops_file.h" #include "super.h" #include "util.h" #include "glops.h" @@ -231,62 +231,115 @@ static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) /** - * gfs2_readpage - readpage with locking - * @file: The file to read a page for. N.B. This may be NULL if we are - * reading an internal file. + * __gfs2_readpage - readpage + * @file: The file to read a page for * @page: The page to read * - * Returns: errno + * This is the core of gfs2's readpage. Its used by the internal file + * reading code as in that case we already hold the glock. Also its + * called by gfs2_readpage() once the required lock has been granted. + * */ -static int gfs2_readpage(struct file *file, struct page *page) +static int __gfs2_readpage(void *file, struct page *page) { struct gfs2_inode *ip = GFS2_I(page->mapping->host); struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); - struct gfs2_file *gf = NULL; - struct gfs2_holder gh; int error; - int do_unlock = 0; - - if (likely(file != &gfs2_internal_file_sentinel)) { - if (file) { - gf = file->private_data; - if (test_bit(GFF_EXLOCK, &gf->f_flags)) - /* gfs2_sharewrite_fault has grabbed the ip->i_gl already */ - goto skip_lock; - } - gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|LM_FLAG_TRY_1CB, &gh); - do_unlock = 1; - error = gfs2_glock_nq_atime(&gh); - if (unlikely(error)) - goto out_unlock; - } -skip_lock: if (gfs2_is_stuffed(ip)) { error = stuffed_readpage(ip, page); unlock_page(page); - } else + } else { error = mpage_readpage(page, gfs2_get_block); + } if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) - error = -EIO; + return -EIO; - if (do_unlock) { - gfs2_glock_dq_m(1, &gh); - gfs2_holder_uninit(&gh); + return error; +} + +/** + * gfs2_readpage - read a page of a file + * @file: The file to read + * @page: The page of the file + * + * This deals with the locking required. If the GFF_EXLOCK flags is set + * then we already hold the glock (due to page fault) and thus we call + * __gfs2_readpage() directly. Otherwise we use a trylock in order to + * avoid the page lock / glock ordering problems returning AOP_TRUNCATED_PAGE + * in the event that we are unable to get the lock. + */ + +static int gfs2_readpage(struct file *file, struct page *page) +{ + struct gfs2_inode *ip = GFS2_I(page->mapping->host); + struct gfs2_holder gh; + int error; + + if (file) { + struct gfs2_file *gf = file->private_data; + if (test_bit(GFF_EXLOCK, &gf->f_flags)) + return __gfs2_readpage(file, page); } + + gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|LM_FLAG_TRY_1CB, &gh); + error = gfs2_glock_nq_atime(&gh); + if (unlikely(error)) { + unlock_page(page); + goto out; + } + error = __gfs2_readpage(file, page); + gfs2_glock_dq(&gh); out: - return error; -out_unlock: - unlock_page(page); + gfs2_holder_uninit(&gh); if (error == GLR_TRYFAILED) { - error = AOP_TRUNCATED_PAGE; yield(); + return AOP_TRUNCATED_PAGE; } - if (do_unlock) - gfs2_holder_uninit(&gh); - goto out; + return error; +} + +/** + * gfs2_internal_read - read an internal file + * @ip: The gfs2 inode + * @ra_state: The readahead state (or NULL for no readahead) + * @buf: The buffer to fill + * @pos: The file position + * @size: The amount to read + * + */ + +int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, + char *buf, loff_t *pos, unsigned size) +{ + struct address_space *mapping = ip->i_inode.i_mapping; + unsigned long index = *pos / PAGE_CACHE_SIZE; + unsigned offset = *pos & (PAGE_CACHE_SIZE - 1); + unsigned copied = 0; + unsigned amt; + struct page *page; + void *p; + + do { + amt = size - copied; + if (offset + size > PAGE_CACHE_SIZE) + amt = PAGE_CACHE_SIZE - offset; + page = read_cache_page(mapping, index, __gfs2_readpage, NULL); + if (IS_ERR(page)) + return PTR_ERR(page); + p = kmap_atomic(page, KM_USER0); + memcpy(buf + copied, p + offset, amt); + kunmap_atomic(p, KM_USER0); + mark_page_accessed(page); + page_cache_release(page); + copied += amt; + index++; + offset = 0; + } while(copied < size); + (*pos) += size; + return size; } /** @@ -314,21 +367,19 @@ static int gfs2_readpages(struct file *file, struct address_space *mapping, int ret = 0; int do_unlock = 0; - if (likely(file != &gfs2_internal_file_sentinel)) { - if (file) { - struct gfs2_file *gf = file->private_data; - if (test_bit(GFF_EXLOCK, &gf->f_flags)) - goto skip_lock; - } - gfs2_holder_init(ip->i_gl, LM_ST_SHARED, - LM_FLAG_TRY_1CB|GL_ATIME, &gh); - do_unlock = 1; - ret = gfs2_glock_nq_atime(&gh); - if (ret == GLR_TRYFAILED) - goto out_noerror; - if (unlikely(ret)) - goto out_unlock; + if (file) { + struct gfs2_file *gf = file->private_data; + if (test_bit(GFF_EXLOCK, &gf->f_flags)) + goto skip_lock; } + gfs2_holder_init(ip->i_gl, LM_ST_SHARED, + LM_FLAG_TRY_1CB|GL_ATIME, &gh); + do_unlock = 1; + ret = gfs2_glock_nq_atime(&gh); + if (ret == GLR_TRYFAILED) + goto out_noerror; + if (unlikely(ret)) + goto out_unlock; skip_lock: if (!gfs2_is_stuffed(ip)) ret = mpage_readpages(mapping, pages, nr_pages, gfs2_get_block); diff --git a/fs/gfs2/ops_address.h b/fs/gfs2/ops_address.h index fa1b5b3d28b9..e8fe83fcd583 100644 --- a/fs/gfs2/ops_address.h +++ b/fs/gfs2/ops_address.h @@ -18,5 +18,8 @@ extern const struct address_space_operations gfs2_file_aops; extern int gfs2_get_block(struct inode *inode, sector_t lblock, struct buffer_head *bh_result, int create); extern int gfs2_releasepage(struct page *page, gfp_t gfp_mask); +extern int gfs2_internal_read(struct gfs2_inode *ip, + struct file_ra_state *ra_state, + char *buf, loff_t *pos, unsigned size); #endif /* __OPS_ADDRESS_DOT_H__ */ diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c index bb11fd6752d3..a729c86b8be1 100644 --- a/fs/gfs2/ops_file.c +++ b/fs/gfs2/ops_file.c @@ -33,7 +33,6 @@ #include "lm.h" #include "log.h" #include "meta_io.h" -#include "ops_file.h" #include "ops_vm.h" #include "quota.h" #include "rgrp.h" @@ -41,50 +40,6 @@ #include "util.h" #include "eaops.h" -/* - * Most fields left uninitialised to catch anybody who tries to - * use them. f_flags set to prevent file_accessed() from touching - * any other part of this. Its use is purely as a flag so that we - * know (in readpage()) whether or not do to locking. - */ -struct file gfs2_internal_file_sentinel = { - .f_flags = O_NOATIME|O_RDONLY, -}; - -static int gfs2_read_actor(read_descriptor_t *desc, struct page *page, - unsigned long offset, unsigned long size) -{ - char *kaddr; - unsigned long count = desc->count; - - if (size > count) - size = count; - - kaddr = kmap(page); - memcpy(desc->arg.data, kaddr + offset, size); - kunmap(page); - - desc->count = count - size; - desc->written += size; - desc->arg.buf += size; - return size; -} - -int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, - char *buf, loff_t *pos, unsigned size) -{ - struct inode *inode = &ip->i_inode; - read_descriptor_t desc; - desc.written = 0; - desc.arg.data = buf; - desc.count = size; - desc.error = 0; - do_generic_mapping_read(inode->i_mapping, ra_state, - &gfs2_internal_file_sentinel, pos, &desc, - gfs2_read_actor); - return desc.written ? desc.written : desc.error; -} - /** * gfs2_llseek - seek to a location in a file * @file: the file diff --git a/fs/gfs2/ops_file.h b/fs/gfs2/ops_file.h deleted file mode 100644 index 7e5d8ec9c846..000000000000 --- a/fs/gfs2/ops_file.h +++ /dev/null @@ -1,24 +0,0 @@ -/* - * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. - * Copyright (C) 2004-2006 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 version 2. - */ - -#ifndef __OPS_FILE_DOT_H__ -#define __OPS_FILE_DOT_H__ - -#include <linux/fs.h> -struct gfs2_inode; - -extern struct file gfs2_internal_file_sentinel; -extern int gfs2_internal_read(struct gfs2_inode *ip, - struct file_ra_state *ra_state, - char *buf, loff_t *pos, unsigned size); -extern void gfs2_set_inode_flags(struct inode *inode); -extern const struct file_operations gfs2_file_fops; -extern const struct file_operations gfs2_dir_fops; - -#endif /* __OPS_FILE_DOT_H__ */ diff --git a/fs/gfs2/ops_inode.h b/fs/gfs2/ops_inode.h index 34f0caac1a03..edb519cb05ee 100644 --- a/fs/gfs2/ops_inode.h +++ b/fs/gfs2/ops_inode.h @@ -16,5 +16,9 @@ extern const struct inode_operations gfs2_file_iops; extern const struct inode_operations gfs2_dir_iops; extern const struct inode_operations gfs2_symlink_iops; extern const struct inode_operations gfs2_dev_iops; +extern const struct file_operations gfs2_file_fops; +extern const struct file_operations gfs2_dir_fops; + +extern void gfs2_set_inode_flags(struct inode *inode); #endif /* __OPS_INODE_DOT_H__ */ diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c index addb51e0f135..4996f0ef3007 100644 --- a/fs/gfs2/quota.c +++ b/fs/gfs2/quota.c @@ -59,7 +59,6 @@ #include "super.h" #include "trans.h" #include "inode.h" -#include "ops_file.h" #include "ops_address.h" #include "util.h" @@ -793,11 +792,9 @@ static int do_glock(struct gfs2_quota_data *qd, int force_refresh, struct gfs2_holder i_gh; struct gfs2_quota_host q; char buf[sizeof(struct gfs2_quota)]; - struct file_ra_state ra_state; int error; struct gfs2_quota_lvb *qlvb; - file_ra_state_init(&ra_state, sdp->sd_quota_inode->i_mapping); restart: error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh); if (error) @@ -820,8 +817,8 @@ restart: memset(buf, 0, sizeof(struct gfs2_quota)); pos = qd2offset(qd); - error = gfs2_internal_read(ip, &ra_state, buf, - &pos, sizeof(struct gfs2_quota)); + error = gfs2_internal_read(ip, NULL, buf, &pos, + sizeof(struct gfs2_quota)); if (error < 0) goto fail_gunlock; diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index 708c287e1d0e..09848aac45f6 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -25,10 +25,10 @@ #include "rgrp.h" #include "super.h" #include "trans.h" -#include "ops_file.h" #include "util.h" #include "log.h" #include "inode.h" +#include "ops_address.h" #define BFITNOENT ((u32)~0) #define NO_BLOCK ((u64)~0) |