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1299 lines
31 KiB
1299 lines
31 KiB
/* |
|
* Copyright (C) 2005, 2006 |
|
* Avishay Traeger (avishay@gmail.com) |
|
* Copyright (C) 2008, 2009 |
|
* Boaz Harrosh <bharrosh@panasas.com> |
|
* |
|
* Copyrights for code taken from ext2: |
|
* Copyright (C) 1992, 1993, 1994, 1995 |
|
* Remy Card (card@masi.ibp.fr) |
|
* Laboratoire MASI - Institut Blaise Pascal |
|
* Universite Pierre et Marie Curie (Paris VI) |
|
* from |
|
* linux/fs/minix/inode.c |
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* Copyright (C) 1991, 1992 Linus Torvalds |
|
* |
|
* This file is part of exofs. |
|
* |
|
* exofs is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation. Since it is based on ext2, and the only |
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* valid version of GPL for the Linux kernel is version 2, the only valid |
|
* version of GPL for exofs is version 2. |
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* |
|
* exofs 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 exofs; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#include <linux/writeback.h> |
|
#include <linux/buffer_head.h> |
|
#include <scsi/scsi_device.h> |
|
|
|
#include "exofs.h" |
|
|
|
#define EXOFS_DBGMSG2(M...) do {} while (0) |
|
|
|
enum { BIO_MAX_PAGES_KMALLOC = |
|
(PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec), |
|
}; |
|
|
|
struct page_collect { |
|
struct exofs_sb_info *sbi; |
|
struct request_queue *req_q; |
|
struct inode *inode; |
|
unsigned expected_pages; |
|
struct exofs_io_state *ios; |
|
|
|
struct bio *bio; |
|
unsigned nr_pages; |
|
unsigned long length; |
|
loff_t pg_first; /* keep 64bit also in 32-arches */ |
|
}; |
|
|
|
static void _pcol_init(struct page_collect *pcol, unsigned expected_pages, |
|
struct inode *inode) |
|
{ |
|
struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; |
|
|
|
pcol->sbi = sbi; |
|
/* Create master bios on first Q, later on cloning, each clone will be |
|
* allocated on it's destination Q |
|
*/ |
|
pcol->req_q = osd_request_queue(sbi->s_ods[0]); |
|
pcol->inode = inode; |
|
pcol->expected_pages = expected_pages; |
|
|
|
pcol->ios = NULL; |
|
pcol->bio = NULL; |
|
pcol->nr_pages = 0; |
|
pcol->length = 0; |
|
pcol->pg_first = -1; |
|
} |
|
|
|
static void _pcol_reset(struct page_collect *pcol) |
|
{ |
|
pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages); |
|
|
|
pcol->bio = NULL; |
|
pcol->nr_pages = 0; |
|
pcol->length = 0; |
|
pcol->pg_first = -1; |
|
pcol->ios = NULL; |
|
|
|
/* this is probably the end of the loop but in writes |
|
* it might not end here. don't be left with nothing |
|
*/ |
|
if (!pcol->expected_pages) |
|
pcol->expected_pages = BIO_MAX_PAGES_KMALLOC; |
|
} |
|
|
|
static int pcol_try_alloc(struct page_collect *pcol) |
|
{ |
|
int pages = min_t(unsigned, pcol->expected_pages, |
|
BIO_MAX_PAGES_KMALLOC); |
|
|
|
if (!pcol->ios) { /* First time allocate io_state */ |
|
int ret = exofs_get_io_state(pcol->sbi, &pcol->ios); |
|
|
|
if (ret) |
|
return ret; |
|
} |
|
|
|
for (; pages; pages >>= 1) { |
|
pcol->bio = bio_kmalloc(GFP_KERNEL, pages); |
|
if (likely(pcol->bio)) |
|
return 0; |
|
} |
|
|
|
EXOFS_ERR("Failed to bio_kmalloc expected_pages=%u\n", |
|
pcol->expected_pages); |
|
return -ENOMEM; |
|
} |
|
|
|
static void pcol_free(struct page_collect *pcol) |
|
{ |
|
if (pcol->bio) { |
|
bio_put(pcol->bio); |
|
pcol->bio = NULL; |
|
} |
|
|
|
if (pcol->ios) { |
|
exofs_put_io_state(pcol->ios); |
|
pcol->ios = NULL; |
|
} |
|
} |
|
|
|
static int pcol_add_page(struct page_collect *pcol, struct page *page, |
|
unsigned len) |
|
{ |
|
int added_len = bio_add_pc_page(pcol->req_q, pcol->bio, page, len, 0); |
|
if (unlikely(len != added_len)) |
|
return -ENOMEM; |
|
|
|
++pcol->nr_pages; |
|
pcol->length += len; |
|
return 0; |
|
} |
|
|
|
static int update_read_page(struct page *page, int ret) |
|
{ |
|
if (ret == 0) { |
|
/* Everything is OK */ |
|
SetPageUptodate(page); |
|
if (PageError(page)) |
|
ClearPageError(page); |
|
} else if (ret == -EFAULT) { |
|
/* In this case we were trying to read something that wasn't on |
|
* disk yet - return a page full of zeroes. This should be OK, |
|
* because the object should be empty (if there was a write |
|
* before this read, the read would be waiting with the page |
|
* locked */ |
|
clear_highpage(page); |
|
|
|
SetPageUptodate(page); |
|
if (PageError(page)) |
|
ClearPageError(page); |
|
ret = 0; /* recovered error */ |
|
EXOFS_DBGMSG("recovered read error\n"); |
|
} else /* Error */ |
|
SetPageError(page); |
|
|
|
return ret; |
|
} |
|
|
|
static void update_write_page(struct page *page, int ret) |
|
{ |
|
if (ret) { |
|
mapping_set_error(page->mapping, ret); |
|
SetPageError(page); |
|
} |
|
end_page_writeback(page); |
|
} |
|
|
|
/* Called at the end of reads, to optionally unlock pages and update their |
|
* status. |
|
*/ |
|
static int __readpages_done(struct page_collect *pcol, bool do_unlock) |
|
{ |
|
struct bio_vec *bvec; |
|
int i; |
|
u64 resid; |
|
u64 good_bytes; |
|
u64 length = 0; |
|
int ret = exofs_check_io(pcol->ios, &resid); |
|
|
|
if (likely(!ret)) |
|
good_bytes = pcol->length; |
|
else |
|
good_bytes = pcol->length - resid; |
|
|
|
EXOFS_DBGMSG("readpages_done(0x%lx) good_bytes=0x%llx" |
|
" length=0x%lx nr_pages=%u\n", |
|
pcol->inode->i_ino, _LLU(good_bytes), pcol->length, |
|
pcol->nr_pages); |
|
|
|
__bio_for_each_segment(bvec, pcol->bio, i, 0) { |
|
struct page *page = bvec->bv_page; |
|
struct inode *inode = page->mapping->host; |
|
int page_stat; |
|
|
|
if (inode != pcol->inode) |
|
continue; /* osd might add more pages at end */ |
|
|
|
if (likely(length < good_bytes)) |
|
page_stat = 0; |
|
else |
|
page_stat = ret; |
|
|
|
EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n", |
|
inode->i_ino, page->index, |
|
page_stat ? "bad_bytes" : "good_bytes"); |
|
|
|
ret = update_read_page(page, page_stat); |
|
if (do_unlock) |
|
unlock_page(page); |
|
length += bvec->bv_len; |
|
} |
|
|
|
pcol_free(pcol); |
|
EXOFS_DBGMSG("readpages_done END\n"); |
|
return ret; |
|
} |
|
|
|
/* callback of async reads */ |
|
static void readpages_done(struct exofs_io_state *ios, void *p) |
|
{ |
|
struct page_collect *pcol = p; |
|
|
|
__readpages_done(pcol, true); |
|
atomic_dec(&pcol->sbi->s_curr_pending); |
|
kfree(pcol); |
|
} |
|
|
|
static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw) |
|
{ |
|
struct bio_vec *bvec; |
|
int i; |
|
|
|
__bio_for_each_segment(bvec, pcol->bio, i, 0) { |
|
struct page *page = bvec->bv_page; |
|
|
|
if (rw == READ) |
|
update_read_page(page, ret); |
|
else |
|
update_write_page(page, ret); |
|
|
|
unlock_page(page); |
|
} |
|
} |
|
|
|
static int read_exec(struct page_collect *pcol, bool is_sync) |
|
{ |
|
struct exofs_i_info *oi = exofs_i(pcol->inode); |
|
struct exofs_io_state *ios = pcol->ios; |
|
struct page_collect *pcol_copy = NULL; |
|
int ret; |
|
|
|
if (!pcol->bio) |
|
return 0; |
|
|
|
/* see comment in _readpage() about sync reads */ |
|
WARN_ON(is_sync && (pcol->nr_pages != 1)); |
|
|
|
ios->bio = pcol->bio; |
|
ios->length = pcol->length; |
|
ios->offset = pcol->pg_first << PAGE_CACHE_SHIFT; |
|
|
|
if (is_sync) { |
|
exofs_oi_read(oi, pcol->ios); |
|
return __readpages_done(pcol, false); |
|
} |
|
|
|
pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); |
|
if (!pcol_copy) { |
|
ret = -ENOMEM; |
|
goto err; |
|
} |
|
|
|
*pcol_copy = *pcol; |
|
ios->done = readpages_done; |
|
ios->private = pcol_copy; |
|
ret = exofs_oi_read(oi, ios); |
|
if (unlikely(ret)) |
|
goto err; |
|
|
|
atomic_inc(&pcol->sbi->s_curr_pending); |
|
|
|
EXOFS_DBGMSG("read_exec obj=0x%llx start=0x%llx length=0x%lx\n", |
|
ios->obj.id, _LLU(ios->offset), pcol->length); |
|
|
|
/* pages ownership was passed to pcol_copy */ |
|
_pcol_reset(pcol); |
|
return 0; |
|
|
|
err: |
|
if (!is_sync) |
|
_unlock_pcol_pages(pcol, ret, READ); |
|
|
|
pcol_free(pcol); |
|
|
|
kfree(pcol_copy); |
|
return ret; |
|
} |
|
|
|
/* readpage_strip is called either directly from readpage() or by the VFS from |
|
* within read_cache_pages(), to add one more page to be read. It will try to |
|
* collect as many contiguous pages as posible. If a discontinuity is |
|
* encountered, or it runs out of resources, it will submit the previous segment |
|
* and will start a new collection. Eventually caller must submit the last |
|
* segment if present. |
|
*/ |
|
static int readpage_strip(void *data, struct page *page) |
|
{ |
|
struct page_collect *pcol = data; |
|
struct inode *inode = pcol->inode; |
|
struct exofs_i_info *oi = exofs_i(inode); |
|
loff_t i_size = i_size_read(inode); |
|
pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; |
|
size_t len; |
|
int ret; |
|
|
|
/* FIXME: Just for debugging, will be removed */ |
|
if (PageUptodate(page)) |
|
EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino, |
|
page->index); |
|
|
|
if (page->index < end_index) |
|
len = PAGE_CACHE_SIZE; |
|
else if (page->index == end_index) |
|
len = i_size & ~PAGE_CACHE_MASK; |
|
else |
|
len = 0; |
|
|
|
if (!len || !obj_created(oi)) { |
|
/* this will be out of bounds, or doesn't exist yet. |
|
* Current page is cleared and the request is split |
|
*/ |
|
clear_highpage(page); |
|
|
|
SetPageUptodate(page); |
|
if (PageError(page)) |
|
ClearPageError(page); |
|
|
|
unlock_page(page); |
|
EXOFS_DBGMSG("readpage_strip(0x%lx, 0x%lx) empty page," |
|
" splitting\n", inode->i_ino, page->index); |
|
|
|
return read_exec(pcol, false); |
|
} |
|
|
|
try_again: |
|
|
|
if (unlikely(pcol->pg_first == -1)) { |
|
pcol->pg_first = page->index; |
|
} else if (unlikely((pcol->pg_first + pcol->nr_pages) != |
|
page->index)) { |
|
/* Discontinuity detected, split the request */ |
|
ret = read_exec(pcol, false); |
|
if (unlikely(ret)) |
|
goto fail; |
|
goto try_again; |
|
} |
|
|
|
if (!pcol->bio) { |
|
ret = pcol_try_alloc(pcol); |
|
if (unlikely(ret)) |
|
goto fail; |
|
} |
|
|
|
if (len != PAGE_CACHE_SIZE) |
|
zero_user(page, len, PAGE_CACHE_SIZE - len); |
|
|
|
EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
|
inode->i_ino, page->index, len); |
|
|
|
ret = pcol_add_page(pcol, page, len); |
|
if (ret) { |
|
EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p " |
|
"this_len=0x%zx nr_pages=%u length=0x%lx\n", |
|
page, len, pcol->nr_pages, pcol->length); |
|
|
|
/* split the request, and start again with current page */ |
|
ret = read_exec(pcol, false); |
|
if (unlikely(ret)) |
|
goto fail; |
|
|
|
goto try_again; |
|
} |
|
|
|
return 0; |
|
|
|
fail: |
|
/* SetPageError(page); ??? */ |
|
unlock_page(page); |
|
return ret; |
|
} |
|
|
|
static int exofs_readpages(struct file *file, struct address_space *mapping, |
|
struct list_head *pages, unsigned nr_pages) |
|
{ |
|
struct page_collect pcol; |
|
int ret; |
|
|
|
_pcol_init(&pcol, nr_pages, mapping->host); |
|
|
|
ret = read_cache_pages(mapping, pages, readpage_strip, &pcol); |
|
if (ret) { |
|
EXOFS_ERR("read_cache_pages => %d\n", ret); |
|
return ret; |
|
} |
|
|
|
return read_exec(&pcol, false); |
|
} |
|
|
|
static int _readpage(struct page *page, bool is_sync) |
|
{ |
|
struct page_collect pcol; |
|
int ret; |
|
|
|
_pcol_init(&pcol, 1, page->mapping->host); |
|
|
|
/* readpage_strip might call read_exec(,is_sync==false) at several |
|
* places but not if we have a single page. |
|
*/ |
|
ret = readpage_strip(&pcol, page); |
|
if (ret) { |
|
EXOFS_ERR("_readpage => %d\n", ret); |
|
return ret; |
|
} |
|
|
|
return read_exec(&pcol, is_sync); |
|
} |
|
|
|
/* |
|
* We don't need the file |
|
*/ |
|
static int exofs_readpage(struct file *file, struct page *page) |
|
{ |
|
return _readpage(page, false); |
|
} |
|
|
|
/* Callback for osd_write. All writes are asynchronous */ |
|
static void writepages_done(struct exofs_io_state *ios, void *p) |
|
{ |
|
struct page_collect *pcol = p; |
|
struct bio_vec *bvec; |
|
int i; |
|
u64 resid; |
|
u64 good_bytes; |
|
u64 length = 0; |
|
int ret = exofs_check_io(ios, &resid); |
|
|
|
atomic_dec(&pcol->sbi->s_curr_pending); |
|
|
|
if (likely(!ret)) |
|
good_bytes = pcol->length; |
|
else |
|
good_bytes = pcol->length - resid; |
|
|
|
EXOFS_DBGMSG("writepages_done(0x%lx) good_bytes=0x%llx" |
|
" length=0x%lx nr_pages=%u\n", |
|
pcol->inode->i_ino, _LLU(good_bytes), pcol->length, |
|
pcol->nr_pages); |
|
|
|
__bio_for_each_segment(bvec, pcol->bio, i, 0) { |
|
struct page *page = bvec->bv_page; |
|
struct inode *inode = page->mapping->host; |
|
int page_stat; |
|
|
|
if (inode != pcol->inode) |
|
continue; /* osd might add more pages to a bio */ |
|
|
|
if (likely(length < good_bytes)) |
|
page_stat = 0; |
|
else |
|
page_stat = ret; |
|
|
|
update_write_page(page, page_stat); |
|
unlock_page(page); |
|
EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n", |
|
inode->i_ino, page->index, page_stat); |
|
|
|
length += bvec->bv_len; |
|
} |
|
|
|
pcol_free(pcol); |
|
kfree(pcol); |
|
EXOFS_DBGMSG("writepages_done END\n"); |
|
} |
|
|
|
static int write_exec(struct page_collect *pcol) |
|
{ |
|
struct exofs_i_info *oi = exofs_i(pcol->inode); |
|
struct exofs_io_state *ios = pcol->ios; |
|
struct page_collect *pcol_copy = NULL; |
|
int ret; |
|
|
|
if (!pcol->bio) |
|
return 0; |
|
|
|
pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); |
|
if (!pcol_copy) { |
|
EXOFS_ERR("write_exec: Faild to kmalloc(pcol)\n"); |
|
ret = -ENOMEM; |
|
goto err; |
|
} |
|
|
|
*pcol_copy = *pcol; |
|
|
|
pcol_copy->bio->bi_rw |= (1 << BIO_RW); /* FIXME: bio_set_dir() */ |
|
|
|
ios->bio = pcol_copy->bio; |
|
ios->offset = pcol_copy->pg_first << PAGE_CACHE_SHIFT; |
|
ios->length = pcol_copy->length; |
|
ios->done = writepages_done; |
|
ios->private = pcol_copy; |
|
|
|
ret = exofs_oi_write(oi, ios); |
|
if (unlikely(ret)) { |
|
EXOFS_ERR("write_exec: exofs_oi_write() Faild\n"); |
|
goto err; |
|
} |
|
|
|
atomic_inc(&pcol->sbi->s_curr_pending); |
|
EXOFS_DBGMSG("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n", |
|
pcol->inode->i_ino, pcol->pg_first, _LLU(ios->offset), |
|
pcol->length); |
|
/* pages ownership was passed to pcol_copy */ |
|
_pcol_reset(pcol); |
|
return 0; |
|
|
|
err: |
|
_unlock_pcol_pages(pcol, ret, WRITE); |
|
pcol_free(pcol); |
|
kfree(pcol_copy); |
|
|
|
return ret; |
|
} |
|
|
|
/* writepage_strip is called either directly from writepage() or by the VFS from |
|
* within write_cache_pages(), to add one more page to be written to storage. |
|
* It will try to collect as many contiguous pages as possible. If a |
|
* discontinuity is encountered or it runs out of resources it will submit the |
|
* previous segment and will start a new collection. |
|
* Eventually caller must submit the last segment if present. |
|
*/ |
|
static int writepage_strip(struct page *page, |
|
struct writeback_control *wbc_unused, void *data) |
|
{ |
|
struct page_collect *pcol = data; |
|
struct inode *inode = pcol->inode; |
|
struct exofs_i_info *oi = exofs_i(inode); |
|
loff_t i_size = i_size_read(inode); |
|
pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; |
|
size_t len; |
|
int ret; |
|
|
|
BUG_ON(!PageLocked(page)); |
|
|
|
ret = wait_obj_created(oi); |
|
if (unlikely(ret)) |
|
goto fail; |
|
|
|
if (page->index < end_index) |
|
/* in this case, the page is within the limits of the file */ |
|
len = PAGE_CACHE_SIZE; |
|
else { |
|
len = i_size & ~PAGE_CACHE_MASK; |
|
|
|
if (page->index > end_index || !len) { |
|
/* in this case, the page is outside the limits |
|
* (truncate in progress) |
|
*/ |
|
ret = write_exec(pcol); |
|
if (unlikely(ret)) |
|
goto fail; |
|
if (PageError(page)) |
|
ClearPageError(page); |
|
unlock_page(page); |
|
EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) " |
|
"outside the limits\n", |
|
inode->i_ino, page->index); |
|
return 0; |
|
} |
|
} |
|
|
|
try_again: |
|
|
|
if (unlikely(pcol->pg_first == -1)) { |
|
pcol->pg_first = page->index; |
|
} else if (unlikely((pcol->pg_first + pcol->nr_pages) != |
|
page->index)) { |
|
/* Discontinuity detected, split the request */ |
|
ret = write_exec(pcol); |
|
if (unlikely(ret)) |
|
goto fail; |
|
|
|
EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n", |
|
inode->i_ino, page->index); |
|
goto try_again; |
|
} |
|
|
|
if (!pcol->bio) { |
|
ret = pcol_try_alloc(pcol); |
|
if (unlikely(ret)) |
|
goto fail; |
|
} |
|
|
|
EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
|
inode->i_ino, page->index, len); |
|
|
|
ret = pcol_add_page(pcol, page, len); |
|
if (unlikely(ret)) { |
|
EXOFS_DBGMSG("Failed pcol_add_page " |
|
"nr_pages=%u total_length=0x%lx\n", |
|
pcol->nr_pages, pcol->length); |
|
|
|
/* split the request, next loop will start again */ |
|
ret = write_exec(pcol); |
|
if (unlikely(ret)) { |
|
EXOFS_DBGMSG("write_exec faild => %d", ret); |
|
goto fail; |
|
} |
|
|
|
goto try_again; |
|
} |
|
|
|
BUG_ON(PageWriteback(page)); |
|
set_page_writeback(page); |
|
|
|
return 0; |
|
|
|
fail: |
|
EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n", |
|
inode->i_ino, page->index, ret); |
|
set_bit(AS_EIO, &page->mapping->flags); |
|
unlock_page(page); |
|
return ret; |
|
} |
|
|
|
static int exofs_writepages(struct address_space *mapping, |
|
struct writeback_control *wbc) |
|
{ |
|
struct page_collect pcol; |
|
long start, end, expected_pages; |
|
int ret; |
|
|
|
start = wbc->range_start >> PAGE_CACHE_SHIFT; |
|
end = (wbc->range_end == LLONG_MAX) ? |
|
start + mapping->nrpages : |
|
wbc->range_end >> PAGE_CACHE_SHIFT; |
|
|
|
if (start || end) |
|
expected_pages = end - start + 1; |
|
else |
|
expected_pages = mapping->nrpages; |
|
|
|
if (expected_pages < 32L) |
|
expected_pages = 32L; |
|
|
|
EXOFS_DBGMSG("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx " |
|
"nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n", |
|
mapping->host->i_ino, wbc->range_start, wbc->range_end, |
|
mapping->nrpages, start, end, expected_pages); |
|
|
|
_pcol_init(&pcol, expected_pages, mapping->host); |
|
|
|
ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol); |
|
if (ret) { |
|
EXOFS_ERR("write_cache_pages => %d\n", ret); |
|
return ret; |
|
} |
|
|
|
return write_exec(&pcol); |
|
} |
|
|
|
static int exofs_writepage(struct page *page, struct writeback_control *wbc) |
|
{ |
|
struct page_collect pcol; |
|
int ret; |
|
|
|
_pcol_init(&pcol, 1, page->mapping->host); |
|
|
|
ret = writepage_strip(page, NULL, &pcol); |
|
if (ret) { |
|
EXOFS_ERR("exofs_writepage => %d\n", ret); |
|
return ret; |
|
} |
|
|
|
return write_exec(&pcol); |
|
} |
|
|
|
int exofs_write_begin(struct file *file, struct address_space *mapping, |
|
loff_t pos, unsigned len, unsigned flags, |
|
struct page **pagep, void **fsdata) |
|
{ |
|
int ret = 0; |
|
struct page *page; |
|
|
|
page = *pagep; |
|
if (page == NULL) { |
|
ret = simple_write_begin(file, mapping, pos, len, flags, pagep, |
|
fsdata); |
|
if (ret) { |
|
EXOFS_DBGMSG("simple_write_begin faild\n"); |
|
return ret; |
|
} |
|
|
|
page = *pagep; |
|
} |
|
|
|
/* read modify write */ |
|
if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) { |
|
ret = _readpage(page, true); |
|
if (ret) { |
|
/*SetPageError was done by _readpage. Is it ok?*/ |
|
unlock_page(page); |
|
EXOFS_DBGMSG("__readpage_filler faild\n"); |
|
} |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int exofs_write_begin_export(struct file *file, |
|
struct address_space *mapping, |
|
loff_t pos, unsigned len, unsigned flags, |
|
struct page **pagep, void **fsdata) |
|
{ |
|
*pagep = NULL; |
|
|
|
return exofs_write_begin(file, mapping, pos, len, flags, pagep, |
|
fsdata); |
|
} |
|
|
|
const struct address_space_operations exofs_aops = { |
|
.readpage = exofs_readpage, |
|
.readpages = exofs_readpages, |
|
.writepage = exofs_writepage, |
|
.writepages = exofs_writepages, |
|
.write_begin = exofs_write_begin_export, |
|
.write_end = simple_write_end, |
|
}; |
|
|
|
/****************************************************************************** |
|
* INODE OPERATIONS |
|
*****************************************************************************/ |
|
|
|
/* |
|
* Test whether an inode is a fast symlink. |
|
*/ |
|
static inline int exofs_inode_is_fast_symlink(struct inode *inode) |
|
{ |
|
struct exofs_i_info *oi = exofs_i(inode); |
|
|
|
return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0); |
|
} |
|
|
|
/* |
|
* get_block_t - Fill in a buffer_head |
|
* An OSD takes care of block allocation so we just fake an allocation by |
|
* putting in the inode's sector_t in the buffer_head. |
|
* TODO: What about the case of create==0 and @iblock does not exist in the |
|
* object? |
|
*/ |
|
static int exofs_get_block(struct inode *inode, sector_t iblock, |
|
struct buffer_head *bh_result, int create) |
|
{ |
|
map_bh(bh_result, inode->i_sb, iblock); |
|
return 0; |
|
} |
|
|
|
const struct osd_attr g_attr_logical_length = ATTR_DEF( |
|
OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8); |
|
|
|
static int _do_truncate(struct inode *inode) |
|
{ |
|
struct exofs_i_info *oi = exofs_i(inode); |
|
loff_t isize = i_size_read(inode); |
|
int ret; |
|
|
|
inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
|
|
|
nobh_truncate_page(inode->i_mapping, isize, exofs_get_block); |
|
|
|
ret = exofs_oi_truncate(oi, (u64)isize); |
|
EXOFS_DBGMSG("(0x%lx) size=0x%llx\n", inode->i_ino, isize); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Truncate a file to the specified size - all we have to do is set the size |
|
* attribute. We make sure the object exists first. |
|
*/ |
|
void exofs_truncate(struct inode *inode) |
|
{ |
|
struct exofs_i_info *oi = exofs_i(inode); |
|
int ret; |
|
|
|
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) |
|
|| S_ISLNK(inode->i_mode))) |
|
return; |
|
if (exofs_inode_is_fast_symlink(inode)) |
|
return; |
|
if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) |
|
return; |
|
|
|
/* if we are about to truncate an object, and it hasn't been |
|
* created yet, wait |
|
*/ |
|
if (unlikely(wait_obj_created(oi))) |
|
goto fail; |
|
|
|
ret = _do_truncate(inode); |
|
if (ret) |
|
goto fail; |
|
|
|
out: |
|
mark_inode_dirty(inode); |
|
return; |
|
fail: |
|
make_bad_inode(inode); |
|
goto out; |
|
} |
|
|
|
/* |
|
* Set inode attributes - just call generic functions. |
|
*/ |
|
int exofs_setattr(struct dentry *dentry, struct iattr *iattr) |
|
{ |
|
struct inode *inode = dentry->d_inode; |
|
int error; |
|
|
|
error = inode_change_ok(inode, iattr); |
|
if (error) |
|
return error; |
|
|
|
error = inode_setattr(inode, iattr); |
|
return error; |
|
} |
|
|
|
/* |
|
* Read an inode from the OSD, and return it as is. We also return the size |
|
* attribute in the 'obj_size' argument. |
|
*/ |
|
static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi, |
|
struct exofs_fcb *inode, uint64_t *obj_size) |
|
{ |
|
struct exofs_sb_info *sbi = sb->s_fs_info; |
|
struct osd_attr attrs[2]; |
|
struct exofs_io_state *ios; |
|
int ret; |
|
|
|
*obj_size = ~0; |
|
ret = exofs_get_io_state(sbi, &ios); |
|
if (unlikely(ret)) { |
|
EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__); |
|
return ret; |
|
} |
|
|
|
ios->obj.id = exofs_oi_objno(oi); |
|
exofs_make_credential(oi->i_cred, &ios->obj); |
|
ios->cred = oi->i_cred; |
|
|
|
attrs[0] = g_attr_inode_data; |
|
attrs[1] = g_attr_logical_length; |
|
ios->in_attr = attrs; |
|
ios->in_attr_len = ARRAY_SIZE(attrs); |
|
|
|
ret = exofs_sbi_read(ios); |
|
if (ret) |
|
goto out; |
|
|
|
ret = extract_attr_from_ios(ios, &attrs[0]); |
|
if (ret) { |
|
EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); |
|
goto out; |
|
} |
|
WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE); |
|
memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE); |
|
|
|
ret = extract_attr_from_ios(ios, &attrs[1]); |
|
if (ret) { |
|
EXOFS_ERR("%s: extract_attr of logical_length failed\n", |
|
__func__); |
|
goto out; |
|
} |
|
*obj_size = get_unaligned_be64(attrs[1].val_ptr); |
|
|
|
out: |
|
exofs_put_io_state(ios); |
|
return ret; |
|
} |
|
|
|
static void __oi_init(struct exofs_i_info *oi) |
|
{ |
|
init_waitqueue_head(&oi->i_wq); |
|
oi->i_flags = 0; |
|
} |
|
/* |
|
* Fill in an inode read from the OSD and set it up for use |
|
*/ |
|
struct inode *exofs_iget(struct super_block *sb, unsigned long ino) |
|
{ |
|
struct exofs_i_info *oi; |
|
struct exofs_fcb fcb; |
|
struct inode *inode; |
|
uint64_t obj_size; |
|
int ret; |
|
|
|
inode = iget_locked(sb, ino); |
|
if (!inode) |
|
return ERR_PTR(-ENOMEM); |
|
if (!(inode->i_state & I_NEW)) |
|
return inode; |
|
oi = exofs_i(inode); |
|
__oi_init(oi); |
|
|
|
/* read the inode from the osd */ |
|
ret = exofs_get_inode(sb, oi, &fcb, &obj_size); |
|
if (ret) |
|
goto bad_inode; |
|
|
|
set_obj_created(oi); |
|
|
|
/* copy stuff from on-disk struct to in-memory struct */ |
|
inode->i_mode = le16_to_cpu(fcb.i_mode); |
|
inode->i_uid = le32_to_cpu(fcb.i_uid); |
|
inode->i_gid = le32_to_cpu(fcb.i_gid); |
|
inode->i_nlink = le16_to_cpu(fcb.i_links_count); |
|
inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime); |
|
inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime); |
|
inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime); |
|
inode->i_ctime.tv_nsec = |
|
inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0; |
|
oi->i_commit_size = le64_to_cpu(fcb.i_size); |
|
i_size_write(inode, oi->i_commit_size); |
|
inode->i_blkbits = EXOFS_BLKSHIFT; |
|
inode->i_generation = le32_to_cpu(fcb.i_generation); |
|
|
|
if ((inode->i_size != obj_size) && |
|
(!exofs_inode_is_fast_symlink(inode))) { |
|
EXOFS_ERR("WARNING: Size of inode=%llu != object=%llu\n", |
|
inode->i_size, _LLU(obj_size)); |
|
/* FIXME: call exofs_inode_recovery() */ |
|
} |
|
|
|
oi->i_dir_start_lookup = 0; |
|
|
|
if ((inode->i_nlink == 0) && (inode->i_mode == 0)) { |
|
ret = -ESTALE; |
|
goto bad_inode; |
|
} |
|
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { |
|
if (fcb.i_data[0]) |
|
inode->i_rdev = |
|
old_decode_dev(le32_to_cpu(fcb.i_data[0])); |
|
else |
|
inode->i_rdev = |
|
new_decode_dev(le32_to_cpu(fcb.i_data[1])); |
|
} else { |
|
memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data)); |
|
} |
|
|
|
if (S_ISREG(inode->i_mode)) { |
|
inode->i_op = &exofs_file_inode_operations; |
|
inode->i_fop = &exofs_file_operations; |
|
inode->i_mapping->a_ops = &exofs_aops; |
|
} else if (S_ISDIR(inode->i_mode)) { |
|
inode->i_op = &exofs_dir_inode_operations; |
|
inode->i_fop = &exofs_dir_operations; |
|
inode->i_mapping->a_ops = &exofs_aops; |
|
} else if (S_ISLNK(inode->i_mode)) { |
|
if (exofs_inode_is_fast_symlink(inode)) |
|
inode->i_op = &exofs_fast_symlink_inode_operations; |
|
else { |
|
inode->i_op = &exofs_symlink_inode_operations; |
|
inode->i_mapping->a_ops = &exofs_aops; |
|
} |
|
} else { |
|
inode->i_op = &exofs_special_inode_operations; |
|
if (fcb.i_data[0]) |
|
init_special_inode(inode, inode->i_mode, |
|
old_decode_dev(le32_to_cpu(fcb.i_data[0]))); |
|
else |
|
init_special_inode(inode, inode->i_mode, |
|
new_decode_dev(le32_to_cpu(fcb.i_data[1]))); |
|
} |
|
|
|
unlock_new_inode(inode); |
|
return inode; |
|
|
|
bad_inode: |
|
iget_failed(inode); |
|
return ERR_PTR(ret); |
|
} |
|
|
|
int __exofs_wait_obj_created(struct exofs_i_info *oi) |
|
{ |
|
if (!obj_created(oi)) { |
|
BUG_ON(!obj_2bcreated(oi)); |
|
wait_event(oi->i_wq, obj_created(oi)); |
|
} |
|
return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0; |
|
} |
|
/* |
|
* Callback function from exofs_new_inode(). The important thing is that we |
|
* set the obj_created flag so that other methods know that the object exists on |
|
* the OSD. |
|
*/ |
|
static void create_done(struct exofs_io_state *ios, void *p) |
|
{ |
|
struct inode *inode = p; |
|
struct exofs_i_info *oi = exofs_i(inode); |
|
struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; |
|
int ret; |
|
|
|
ret = exofs_check_io(ios, NULL); |
|
exofs_put_io_state(ios); |
|
|
|
atomic_dec(&sbi->s_curr_pending); |
|
|
|
if (unlikely(ret)) { |
|
EXOFS_ERR("object=0x%llx creation faild in pid=0x%llx", |
|
_LLU(exofs_oi_objno(oi)), _LLU(sbi->s_pid)); |
|
/*TODO: When FS is corrupted creation can fail, object already |
|
* exist. Get rid of this asynchronous creation, if exist |
|
* increment the obj counter and try the next object. Until we |
|
* succeed. All these dangling objects will be made into lost |
|
* files by chkfs.exofs |
|
*/ |
|
} |
|
|
|
set_obj_created(oi); |
|
|
|
atomic_dec(&inode->i_count); |
|
wake_up(&oi->i_wq); |
|
} |
|
|
|
/* |
|
* Set up a new inode and create an object for it on the OSD |
|
*/ |
|
struct inode *exofs_new_inode(struct inode *dir, int mode) |
|
{ |
|
struct super_block *sb; |
|
struct inode *inode; |
|
struct exofs_i_info *oi; |
|
struct exofs_sb_info *sbi; |
|
struct exofs_io_state *ios; |
|
int ret; |
|
|
|
sb = dir->i_sb; |
|
inode = new_inode(sb); |
|
if (!inode) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
oi = exofs_i(inode); |
|
__oi_init(oi); |
|
|
|
set_obj_2bcreated(oi); |
|
|
|
sbi = sb->s_fs_info; |
|
|
|
sb->s_dirt = 1; |
|
inode->i_uid = current->cred->fsuid; |
|
if (dir->i_mode & S_ISGID) { |
|
inode->i_gid = dir->i_gid; |
|
if (S_ISDIR(mode)) |
|
mode |= S_ISGID; |
|
} else { |
|
inode->i_gid = current->cred->fsgid; |
|
} |
|
inode->i_mode = mode; |
|
|
|
inode->i_ino = sbi->s_nextid++; |
|
inode->i_blkbits = EXOFS_BLKSHIFT; |
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
|
oi->i_commit_size = inode->i_size = 0; |
|
spin_lock(&sbi->s_next_gen_lock); |
|
inode->i_generation = sbi->s_next_generation++; |
|
spin_unlock(&sbi->s_next_gen_lock); |
|
insert_inode_hash(inode); |
|
|
|
mark_inode_dirty(inode); |
|
|
|
ret = exofs_get_io_state(sbi, &ios); |
|
if (unlikely(ret)) { |
|
EXOFS_ERR("exofs_new_inode: exofs_get_io_state failed\n"); |
|
return ERR_PTR(ret); |
|
} |
|
|
|
ios->obj.id = exofs_oi_objno(oi); |
|
exofs_make_credential(oi->i_cred, &ios->obj); |
|
|
|
/* increment the refcount so that the inode will still be around when we |
|
* reach the callback |
|
*/ |
|
atomic_inc(&inode->i_count); |
|
|
|
ios->done = create_done; |
|
ios->private = inode; |
|
ios->cred = oi->i_cred; |
|
ret = exofs_sbi_create(ios); |
|
if (ret) { |
|
atomic_dec(&inode->i_count); |
|
exofs_put_io_state(ios); |
|
return ERR_PTR(ret); |
|
} |
|
atomic_inc(&sbi->s_curr_pending); |
|
|
|
return inode; |
|
} |
|
|
|
/* |
|
* struct to pass two arguments to update_inode's callback |
|
*/ |
|
struct updatei_args { |
|
struct exofs_sb_info *sbi; |
|
struct exofs_fcb fcb; |
|
}; |
|
|
|
/* |
|
* Callback function from exofs_update_inode(). |
|
*/ |
|
static void updatei_done(struct exofs_io_state *ios, void *p) |
|
{ |
|
struct updatei_args *args = p; |
|
|
|
exofs_put_io_state(ios); |
|
|
|
atomic_dec(&args->sbi->s_curr_pending); |
|
|
|
kfree(args); |
|
} |
|
|
|
/* |
|
* Write the inode to the OSD. Just fill up the struct, and set the attribute |
|
* synchronously or asynchronously depending on the do_sync flag. |
|
*/ |
|
static int exofs_update_inode(struct inode *inode, int do_sync) |
|
{ |
|
struct exofs_i_info *oi = exofs_i(inode); |
|
struct super_block *sb = inode->i_sb; |
|
struct exofs_sb_info *sbi = sb->s_fs_info; |
|
struct exofs_io_state *ios; |
|
struct osd_attr attr; |
|
struct exofs_fcb *fcb; |
|
struct updatei_args *args; |
|
int ret; |
|
|
|
args = kzalloc(sizeof(*args), GFP_KERNEL); |
|
if (!args) |
|
return -ENOMEM; |
|
|
|
fcb = &args->fcb; |
|
|
|
fcb->i_mode = cpu_to_le16(inode->i_mode); |
|
fcb->i_uid = cpu_to_le32(inode->i_uid); |
|
fcb->i_gid = cpu_to_le32(inode->i_gid); |
|
fcb->i_links_count = cpu_to_le16(inode->i_nlink); |
|
fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); |
|
fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec); |
|
fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); |
|
oi->i_commit_size = i_size_read(inode); |
|
fcb->i_size = cpu_to_le64(oi->i_commit_size); |
|
fcb->i_generation = cpu_to_le32(inode->i_generation); |
|
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { |
|
if (old_valid_dev(inode->i_rdev)) { |
|
fcb->i_data[0] = |
|
cpu_to_le32(old_encode_dev(inode->i_rdev)); |
|
fcb->i_data[1] = 0; |
|
} else { |
|
fcb->i_data[0] = 0; |
|
fcb->i_data[1] = |
|
cpu_to_le32(new_encode_dev(inode->i_rdev)); |
|
fcb->i_data[2] = 0; |
|
} |
|
} else |
|
memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data)); |
|
|
|
ret = exofs_get_io_state(sbi, &ios); |
|
if (unlikely(ret)) { |
|
EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__); |
|
goto free_args; |
|
} |
|
|
|
attr = g_attr_inode_data; |
|
attr.val_ptr = fcb; |
|
ios->out_attr_len = 1; |
|
ios->out_attr = &attr; |
|
|
|
if (!obj_created(oi)) { |
|
EXOFS_DBGMSG("!obj_created\n"); |
|
BUG_ON(!obj_2bcreated(oi)); |
|
wait_event(oi->i_wq, obj_created(oi)); |
|
EXOFS_DBGMSG("wait_event done\n"); |
|
} |
|
|
|
if (!do_sync) { |
|
args->sbi = sbi; |
|
ios->done = updatei_done; |
|
ios->private = args; |
|
} |
|
|
|
ret = exofs_oi_write(oi, ios); |
|
if (!do_sync && !ret) { |
|
atomic_inc(&sbi->s_curr_pending); |
|
goto out; /* deallocation in updatei_done */ |
|
} |
|
|
|
exofs_put_io_state(ios); |
|
free_args: |
|
kfree(args); |
|
out: |
|
EXOFS_DBGMSG("ret=>%d\n", ret); |
|
return ret; |
|
} |
|
|
|
int exofs_write_inode(struct inode *inode, int wait) |
|
{ |
|
return exofs_update_inode(inode, wait); |
|
} |
|
|
|
/* |
|
* Callback function from exofs_delete_inode() - don't have much cleaning up to |
|
* do. |
|
*/ |
|
static void delete_done(struct exofs_io_state *ios, void *p) |
|
{ |
|
struct exofs_sb_info *sbi = p; |
|
|
|
exofs_put_io_state(ios); |
|
|
|
atomic_dec(&sbi->s_curr_pending); |
|
} |
|
|
|
/* |
|
* Called when the refcount of an inode reaches zero. We remove the object |
|
* from the OSD here. We make sure the object was created before we try and |
|
* delete it. |
|
*/ |
|
void exofs_delete_inode(struct inode *inode) |
|
{ |
|
struct exofs_i_info *oi = exofs_i(inode); |
|
struct super_block *sb = inode->i_sb; |
|
struct exofs_sb_info *sbi = sb->s_fs_info; |
|
struct exofs_io_state *ios; |
|
int ret; |
|
|
|
truncate_inode_pages(&inode->i_data, 0); |
|
|
|
if (is_bad_inode(inode)) |
|
goto no_delete; |
|
|
|
mark_inode_dirty(inode); |
|
exofs_update_inode(inode, inode_needs_sync(inode)); |
|
|
|
inode->i_size = 0; |
|
if (inode->i_blocks) |
|
exofs_truncate(inode); |
|
|
|
clear_inode(inode); |
|
|
|
ret = exofs_get_io_state(sbi, &ios); |
|
if (unlikely(ret)) { |
|
EXOFS_ERR("%s: exofs_get_io_state failed\n", __func__); |
|
return; |
|
} |
|
|
|
/* if we are deleting an obj that hasn't been created yet, wait */ |
|
if (!obj_created(oi)) { |
|
BUG_ON(!obj_2bcreated(oi)); |
|
wait_event(oi->i_wq, obj_created(oi)); |
|
} |
|
|
|
ios->obj.id = exofs_oi_objno(oi); |
|
ios->done = delete_done; |
|
ios->private = sbi; |
|
ios->cred = oi->i_cred; |
|
ret = exofs_sbi_remove(ios); |
|
if (ret) { |
|
EXOFS_ERR("%s: exofs_sbi_remove failed\n", __func__); |
|
exofs_put_io_state(ios); |
|
return; |
|
} |
|
atomic_inc(&sbi->s_curr_pending); |
|
|
|
return; |
|
|
|
no_delete: |
|
clear_inode(inode); |
|
}
|
|
|