litmus-rt.git - The LITMUS^RT kernel.

diff options

author	Mark Brown <broonie@opensource.wolfsonmicro.com>	2008-04-22 11:08:52 -0400
committer	Takashi Iwai <tiwai@suse.de>	2008-04-24 06:00:41 -0400
commit	7a22323b231fe5d47804f98f31a70eb34c6104a9 (patch)
tree	da5d3424f1fef8371a091fe82a4b3520df4279d6 /sound/soc/pxa/pxa2xx-ac97.c
parent	d80fd0935e2c177ae58d85cb736684ff6c00314d (diff)

[ALSA] soc - Support PXA3xx AC97

The PXA3xx does not support the use of interrupts during reset and access to the GPIO status requires similar handling to that for PXA27x. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>

Diffstat (limited to 'sound/soc/pxa/pxa2xx-ac97.c')

-rw-r--r--

sound/soc/pxa/pxa2xx-ac97.c

1 files changed, 27 insertions, 2 deletions

         mutex_lock(&car_mutex);
         /* set up primary or secondary codec/modem space */
-#ifdef CONFIG_PXA27x
+#if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
         reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
 #else
         if (reg == AC97_GPIO_STATUS)
         mutex_lock(&car_mutex);
         /* set up primary or secondary codec/modem space */
-#ifdef CONFIG_PXA27x
+#if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
         reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
 #else
         if (reg == AC97_GPIO_STATUS)
 static void pxa2xx_ac97_warm_reset(struct snd_ac97 *ac97)
 {
+#ifdef CONFIG_PXA3xx
+        int timeout = 100;
+#endif
         gsr_bits = 0;
 #ifdef CONFIG_PXA27x
         GCR |= GCR_WARM_RST;
         pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
         udelay(500);
+#elif defined(CONFIG_PXA3xx)
+        /* Can't use interrupts */
+        GCR |= GCR_WARM_RST;
+        while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
+                mdelay(1);
 #else
         GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN;
         wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
 static void pxa2xx_ac97_cold_reset(struct snd_ac97 *ac97)
 {
+#ifdef CONFIG_PXA3xx
+        int timeout = 1000;
+        /* Hold CLKBPB for 100us */
+        GCR = 0;
+        GCR = GCR_CLKBPB;
+        udelay(100);
+        GCR = 0;
+#endif
         GCR &=  GCR_COLD_RST;  /* clear everything but nCRST */
         GCR &= ~GCR_COLD_RST;  /* then assert nCRST */
         clk_disable(ac97conf_clk);
         GCR = GCR_COLD_RST;
         udelay(50);
+#elif defined(CONFIG_PXA3xx)
+        /* Can't use interrupts on PXA3xx */
+        GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
+        GCR = GCR_WARM_RST | GCR_COLD_RST;
+        while (!(GSR & (GSR_PCR | GSR_SCR)) && timeout--)
+                mdelay(10);
 #else
         GCR = GCR_COLD_RST;
         GCR |= GCR_CDONE_IE|GCR_SDONE_IE;

/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * 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/slab.h> #include <linux/highmem.h> #include <linux/pagemap.h> #include <asm/byteorder.h> #include <linux/swap.h> #include <linux/pipe_fs_i.h> #include <linux/mpage.h> #include <linux/quotaops.h> #include <linux/blkdev.h> #include <linux/uio.h> #include <cluster/masklog.h> #include "ocfs2.h" #include "alloc.h" #include "aops.h" #include "dlmglue.h" #include "extent_map.h" #include "file.h" #include "inode.h" #include "journal.h" #include "suballoc.h" #include "super.h" #include "symlink.h" #include "refcounttree.h" #include "ocfs2_trace.h" #include "buffer_head_io.h" #include "dir.h" #include "namei.h" #include "sysfile.h" static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) { int err = -EIO; int status; struct ocfs2_dinode *fe = NULL; struct buffer_head *bh = NULL; struct buffer_head *buffer_cache_bh = NULL; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); void *kaddr; trace_ocfs2_symlink_get_block( (unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)iblock, bh_result, create); BUG_ON(ocfs2_inode_is_fast_symlink(inode)); if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) { mlog(ML_ERROR, "block offset > PATH_MAX: %llu", (unsigned long long)iblock); goto bail; } status = ocfs2_read_inode_block(inode, &bh); if (status < 0) { mlog_errno(status); goto bail; } fe = (struct ocfs2_dinode *) bh->b_data; if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, le32_to_cpu(fe->i_clusters))) { err = -ENOMEM; mlog(ML_ERROR, "block offset is outside the allocated size: " "%llu\n", (unsigned long long)iblock); goto bail; } /* We don't use the page cache to create symlink data, so if * need be, copy it over from the buffer cache. */ if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock; buffer_cache_bh = sb_getblk(osb->sb, blkno); if (!buffer_cache_bh) { err = -ENOMEM; mlog(ML_ERROR, "couldn't getblock for symlink!\n"); goto bail; } /* we haven't locked out transactions, so a commit * could've happened. Since we've got a reference on * the bh, even if it commits while we're doing the * copy, the data is still good. */ if (buffer_jbd(buffer_cache_bh) && ocfs2_inode_is_new(inode)) { kaddr = kmap_atomic(bh_result->b_page); if (!kaddr) { mlog(ML_ERROR, "couldn't kmap!\n"); goto bail; } memcpy(kaddr + (bh_result->b_size * iblock), buffer_cache_bh->b_data, bh_result->b_size); kunmap_atomic(kaddr); set_buffer_uptodate(bh_result); } brelse(buffer_cache_bh); } map_bh(bh_result, inode->i_sb, le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); err = 0; bail: brelse(bh); return err; } int ocfs2_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) { int err = 0; unsigned int ext_flags; u64 max_blocks = bh_result->b_size >> inode->i_blkbits; u64 p_blkno, count, past_eof; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)iblock, bh_result, create); if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", inode, inode->i_ino); if (S_ISLNK(inode->i_mode)) { /* this always does I/O for some reason. */ err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); goto bail; } err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count, &ext_flags); if (err) { mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " "%llu, NULL)\n", err, inode, (unsigned long long)iblock, (unsigned long long)p_blkno); goto bail; } if (max_blocks < count) count = max_blocks; /* * ocfs2 never allocates in this function - the only time we * need to use BH_New is when we're extending i_size on a file * system which doesn't support holes, in which case BH_New * allows __block_write_begin() to zero. * * If we see this on a sparse file system, then a truncate has * raced us and removed the cluster. In this case, we clear * the buffers dirty and uptodate bits and let the buffer code * ignore it as a hole. */ if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) { clear_buffer_dirty(bh_result); clear_buffer_uptodate(bh_result); goto bail; } /* Treat the unwritten extent as a hole for zeroing purposes. */ if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) map_bh(bh_result, inode->i_sb, p_blkno); bh_result->b_size = count << inode->i_blkbits; if (!ocfs2_sparse_alloc(osb)) { if (p_blkno == 0) { err = -EIO; mlog(ML_ERROR, "iblock = %llu p_blkno = %llu blkno=(%llu)\n", (unsigned long long)iblock, (unsigned long long)p_blkno, (unsigned long long)OCFS2_I(inode)->ip_blkno); mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); dump_stack(); goto bail; } } past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)past_eof); if (create && (iblock >= past_eof)) set_buffer_new(bh_result); bail: if (err < 0) err = -EIO; return err; } int ocfs2_read_inline_data(struct inode *inode, struct page *page, struct buffer_head *di_bh) { void *kaddr; loff_t size; struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) { ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag", (unsigned long long)OCFS2_I(inode)->ip_blkno); return -EROFS; } size = i_size_read(inode); if (size > PAGE_CACHE_SIZE || size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) { ocfs2_error(inode->i_sb, "Inode %llu has with inline data has bad size: %Lu", (unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)size); return -EROFS; } kaddr = kmap_atomic(page); if (size) memcpy(kaddr, di->id2.i_data.id_data, size); /* Clear the remaining part of the page */ memset(kaddr + size, 0, PAGE_CACHE_SIZE - size); flush_dcache_page(page); kunmap_atomic(kaddr); SetPageUptodate(page); return 0; } static int ocfs2_readpage_inline(struct inode *inode, struct page *page) { int ret; struct buffer_head *di_bh = NULL; BUG_ON(!PageLocked(page)); BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)); ret = ocfs2_read_inode_block(inode, &di_bh); if (ret) { mlog_errno(ret); goto out; } ret = ocfs2_read_inline_data(inode, page, di_bh); out: unlock_page(page); brelse(di_bh); return ret; } static int ocfs2_readpage(struct file *file, struct page *page) { struct inode *inode = page->mapping->host; struct ocfs2_inode_info *oi = OCFS2_I(inode); loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT; int ret, unlock = 1; trace_ocfs2_readpage((unsigned long long)oi->ip_blkno, (page ? page->index : 0)); ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page); if (ret != 0) { if (ret == AOP_TRUNCATED_PAGE) unlock = 0; mlog_errno(ret); goto out; } if (down_read_trylock(&oi->ip_alloc_sem) == 0) { /* * Unlock the page and cycle ip_alloc_sem so that we don't * busyloop waiting for ip_alloc_sem to unlock */ ret = AOP_TRUNCATED_PAGE; unlock_page(page); unlock = 0; down_read(&oi->ip_alloc_sem); up_read(&oi->ip_alloc_sem); goto out_inode_unlock; } /* * i_size might have just been updated as we grabed the meta lock. We * might now be discovering a truncate that hit on another node. * block_read_full_page->get_block freaks out if it is asked to read * beyond the end of a file, so we check here. Callers * (generic_file_read, vm_ops->fault) are clever enough to check i_size * and notice that the page they just read isn't needed. * * XXX sys_readahead() seems to get that wrong? */ if (start >= i_size_read(inode)) { zero_user(page, 0, PAGE_SIZE); SetPageUptodate(page); ret = 0; goto out_alloc; } if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) ret = ocfs2_readpage_inline(inode, page); else ret = block_read_full_page(page, ocfs2_get_block); unlock = 0; out_alloc: up_read(&OCFS2_I(inode)->ip_alloc_sem); out_inode_unlock: ocfs2_inode_unlock(inode, 0); out: if (unlock) unlock_page(page); return ret; } /* * This is used only for read-ahead. Failures or difficult to handle * situations are safe to ignore. * * Right now, we don't bother with BH_Boundary - in-inode extent lists * are quite large (243 extents on 4k blocks), so most inodes don't * grow out to a tree. If need be, detecting boundary extents could * trivially be added in a future version of ocfs2_get_block(). */ static int ocfs2_readpages(struct file *filp, struct address_space *mapping, struct list_head *pages, unsigned nr_pages) { int ret, err = -EIO; struct inode *inode = mapping->host; struct ocfs2_inode_info *oi = OCFS2_I(inode); loff_t start; struct page *last; /* * Use the nonblocking flag for the dlm code to avoid page * lock inversion, but don't bother with retrying. */ ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK); if (ret) return err; if (down_read_trylock(&oi->ip_alloc_sem) == 0) { ocfs2_inode_unlock(inode, 0); return err; } /* * Don't bother with inline-data. There isn't anything * to read-ahead in that case anyway... */ if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) goto out_unlock; /* * Check whether a remote node truncated this file - we just * drop out in that case as it's not worth handling here. */ last = list_entry(pages->prev, struct page, lru); start = (loff_t)last->index << PAGE_CACHE_SHIFT; if (start >= i_size_read(inode)) goto out_unlock; err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block); out_unlock: up_read(&oi->ip_alloc_sem); ocfs2_inode_unlock(inode, 0); return err; } /* Note: Because we don't support holes, our allocation has * already happened (allocation writes zeros to the file data) * so we don't have to worry about ordered writes in * ocfs2_writepage. * * ->writepage is called during the process of invalidating the page cache * during blocked lock processing. It can't block on any cluster locks * to during block mapping. It's relying on the fact that the block * mapping can't have disappeared under the dirty pages that it is * being asked to write back. */ static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) { trace_ocfs2_writepage( (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno, page->index); return block_write_full_page(page, ocfs2_get_block, wbc); } /* Taken from ext3. We don't necessarily need the full blown * functionality yet, but IMHO it's better to cut and paste the whole * thing so we can avoid introducing our own bugs (and easily pick up * their fixes when they happen) --Mark */ int walk_page_buffers( handle_t *handle, struct buffer_head *head, unsigned from, unsigned to, int *partial, int (*fn)( handle_t *handle, struct buffer_head *bh)) { struct buffer_head *bh; unsigned block_start, block_end; unsigned blocksize = head->b_size; int err, ret = 0; struct buffer_head *next; for ( bh = head, block_start = 0; ret == 0 && (bh != head || !block_start); block_start = block_end, bh = next) { next = bh->b_this_page; block_end = block_start + blocksize; if (block_end <= from || block_start >= to) { if (partial && !buffer_uptodate(bh)) *partial = 1; continue; } err = (*fn)(handle, bh); if (!ret) ret = err; } return ret; } static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) { sector_t status; u64 p_blkno = 0; int err = 0; struct inode *inode = mapping->host; trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)block); /* We don't need to lock journal system files, since they aren't * accessed concurrently from multiple nodes. */ if (!INODE_JOURNAL(inode)) { err = ocfs2_inode_lock(inode, NULL, 0); if (err) { if (err != -ENOENT) mlog_errno(err); goto bail; } down_read(&OCFS2_I(inode)->ip_alloc_sem); } if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, NULL); if (!INODE_JOURNAL(inode)) { up_read(&OCFS2_I(inode)->ip_alloc_sem); ocfs2_inode_unlock(inode, 0); } if (err) { mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", (unsigned long long)block); mlog_errno(err); goto bail; } bail: status = err ? 0 : p_blkno; return status; } /* * TODO: Make this into a generic get_blocks function. * * From do_direct_io in direct-io.c: * "So what we do is to permit the ->get_blocks function to populate * bh.b_size with the size of IO which is permitted at this offset and * this i_blkbits." * * This function is called directly from get_more_blocks in direct-io.c. * * called like this: dio->get_blocks(dio->inode, fs_startblk, * fs_count, map_bh, dio->rw == WRITE); */ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) { int ret; u32 cpos = 0; int alloc_locked = 0; u64 p_blkno, inode_blocks, contig_blocks; unsigned int ext_flags; unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; unsigned long len = bh_result->b_size; unsigned int clusters_to_alloc = 0; cpos = ocfs2_blocks_to_clusters(inode->i_sb, iblock); /* This function won't even be called if the request isn't all * nicely aligned and of the right size, so there's no need * for us to check any of that. */ inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); /* This figures out the size of the next contiguous block, and * our logical offset */ ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &contig_blocks, &ext_flags); if (ret) { mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", (unsigned long long)iblock); ret = -EIO; goto bail; } /* We should already CoW the refcounted extent in case of create. */ BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED)); /* allocate blocks if no p_blkno is found, and create == 1 */ if (!p_blkno && create) { ret = ocfs2_inode_lock(inode, NULL, 1); if (ret < 0) { mlog_errno(ret); goto bail; } alloc_locked = 1; /* fill hole, allocate blocks can't be larger than the size * of the hole */ clusters_to_alloc = ocfs2_clusters_for_bytes(inode->i_sb, len); if (clusters_to_alloc > contig_blocks) clusters_to_alloc = contig_blocks; /* allocate extent and insert them into the extent tree */ ret = ocfs2_extend_allocation(inode, cpos, clusters_to_alloc, 0); if (ret < 0) { mlog_errno(ret); goto bail; } ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &contig_blocks, &ext_flags); if (ret < 0) { mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", (unsigned long long)iblock); ret = -EIO; goto bail; } } /* * get_more_blocks() expects us to describe a hole by clearing * the mapped bit on bh_result(). * * Consider an unwritten extent as a hole. */ if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) map_bh(bh_result, inode->i_sb, p_blkno); else clear_buffer_mapped(bh_result); /* make sure we don't map more than max_blocks blocks here as that's all the kernel will handle at this point. */ if (max_blocks < contig_blocks) contig_blocks = max_blocks; bh_result->b_size = contig_blocks << blocksize_bits; bail: if (alloc_locked) ocfs2_inode_unlock(inode, 1); return ret; } /* * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're * particularly interested in the aio/dio case. We use the rw_lock DLM lock * to protect io on one node from truncation on another. */ static void ocfs2_dio_end_io(struct kiocb *iocb, loff_t offset, ssize_t bytes, void *private) { struct inode *inode = file_inode(iocb->ki_filp); int level; /* this io's submitter should not have unlocked this before we could */ BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); if (ocfs2_iocb_is_sem_locked(iocb)) ocfs2_iocb_clear_sem_locked(iocb); if (ocfs2_iocb_is_unaligned_aio(iocb)) { ocfs2_iocb_clear_unaligned_aio(iocb); mutex_unlock(&OCFS2_I(inode)->ip_unaligned_aio); } ocfs2_iocb_clear_rw_locked(iocb); level = ocfs2_iocb_rw_locked_level(iocb); ocfs2_rw_unlock(inode, level); } static int ocfs2_releasepage(struct page *page, gfp_t wait) { if (!page_has_buffers(page)) return 0; return try_to_free_buffers(page); } static int ocfs2_is_overwrite(struct ocfs2_super *osb, struct inode *inode, loff_t offset) { int ret = 0; u32 v_cpos = 0; u32 p_cpos = 0; unsigned int num_clusters = 0; unsigned int ext_flags = 0; v_cpos = ocfs2_bytes_to_clusters(osb->sb, offset); ret = ocfs2_get_clusters(inode, v_cpos, &p_cpos, &num_clusters, &ext_flags); if (ret < 0) { mlog_errno(ret); return ret; } if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) return 1; return 0; } static ssize_t ocfs2_direct_IO_write(struct kiocb *iocb, struct iov_iter *iter, loff_t offset) { ssize_t ret = 0; ssize_t written = 0; bool orphaned = false; int is_overwrite = 0; struct file *file = iocb->ki_filp; struct inode *inode = file_inode(file)->i_mapping->host; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct buffer_head *di_bh = NULL; size_t count = iter->count; journal_t *journal = osb->journal->j_journal; u32 zero_len; int cluster_align; loff_t final_size = offset + count; int append_write = offset >= i_size_read(inode) ? 1 : 0; unsigned int num_clusters = 0; unsigned int ext_flags = 0; { u64 o = offset; zero_len = do_div(o, 1 << osb->s_clustersize_bits); cluster_align = !zero_len; } /* * when final_size > inode->i_size, inode->i_size will be * updated after direct write, so add the inode to orphan * dir first. */ if (final_size > i_size_read(inode)) { ret = ocfs2_add_inode_to_orphan(osb, inode); if (ret < 0) { mlog_errno(ret); goto out; } orphaned = true; } if (append_write) { ret = ocfs2_inode_lock(inode, &di_bh, 1); if (ret < 0) { mlog_errno(ret); goto clean_orphan; } if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) ret = ocfs2_zero_extend(inode, di_bh, offset); else ret = ocfs2_extend_no_holes(inode, di_bh, offset, offset); if (ret < 0) { mlog_errno(ret); ocfs2_inode_unlock(inode, 1); brelse(di_bh); goto clean_orphan; } is_overwrite = ocfs2_is_overwrite(osb, inode, offset); if (is_overwrite < 0) { mlog_errno(is_overwrite); ocfs2_inode_unlock(inode, 1); brelse(di_bh); goto clean_orphan; } ocfs2_inode_unlock(inode, 1); brelse(di_bh); di_bh = NULL; } written = __blockdev_direct_IO(WRITE, iocb, inode, inode->i_sb->s_bdev, iter, offset, ocfs2_direct_IO_get_blocks, ocfs2_dio_end_io, NULL, 0); if (unlikely(written < 0)) { loff_t i_size = i_size_read(inode); if (offset + count > i_size) { ret = ocfs2_inode_lock(inode, &di_bh, 1); if (ret < 0) { mlog_errno(ret); goto clean_orphan; } if (i_size == i_size_read(inode)) { ret = ocfs2_truncate_file(inode, di_bh, i_size); if (ret < 0) { if (ret != -ENOSPC) mlog_errno(ret); ocfs2_inode_unlock(inode, 1); brelse(di_bh); goto clean_orphan; } } ocfs2_inode_unlock(inode, 1); brelse(di_bh); ret = jbd2_journal_force_commit(journal); if (ret < 0) mlog_errno(ret); } } else if (written < 0 && append_write && !is_overwrite && !cluster_align) { u32 p_cpos = 0; u32 v_cpos = ocfs2_bytes_to_clusters(osb->sb, offset); ret = ocfs2_get_clusters(inode, v_cpos, &p_cpos, &num_clusters, &ext_flags); if (ret < 0) { mlog_errno(ret); goto clean_orphan; } BUG_ON(!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN)); ret = blkdev_issue_zeroout(osb->sb->s_bdev, p_cpos << (osb->s_clustersize_bits - 9), zero_len >> 9, GFP_KERNEL, false); if (ret < 0) mlog_errno(ret); } clean_orphan: if (orphaned) { int tmp_ret; int update_isize = written > 0 ? 1 : 0; loff_t end = update_isize ? offset + written : 0; tmp_ret = ocfs2_del_inode_from_orphan(osb, inode, update_isize, end); if (tmp_ret < 0) { ret = tmp_ret; goto out; } tmp_ret = jbd2_journal_force_commit(journal); if (tmp_ret < 0) { ret = tmp_ret; mlog_errno(tmp_ret); } } out: if (ret >= 0) ret = written; return ret; } static ssize_t ocfs2_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter, loff_t offset) { struct file *file = iocb->ki_filp; struct inode *inode = file_inode(file)->i_mapping->host; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); int full_coherency = !(osb->s_mount_opt & OCFS2_MOUNT_COHERENCY_BUFFERED); /* * Fallback to buffered I/O if we see an inode without * extents. */ if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) return 0; /* Fallback to buffered I/O if we are appending and * concurrent O_DIRECT writes are allowed. */ if (i_size_read(inode) <= offset && !full_coherency) return 0; if (rw == READ) return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iter, offset, ocfs2_direct_IO_get_blocks, ocfs2_dio_end_io, NULL, 0); else return ocfs2_direct_IO_write(iocb, iter, offset); } static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, u32 cpos, unsigned int *start, unsigned int *end) { unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE; if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) { unsigned int cpp; cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits); cluster_start = cpos % cpp; cluster_start = cluster_start << osb->s_clustersize_bits; cluster_end = cluster_start + osb->s_clustersize; } BUG_ON(cluster_start > PAGE_SIZE); BUG_ON(cluster_end > PAGE_SIZE); if (start) *start = cluster_start; if (end) *end = cluster_end; } /* * 'from' and 'to' are the region in the page to avoid zeroing. * * If pagesize > clustersize, this function will avoid zeroing outside * of the cluster boundary. * * from == to == 0 is code for "zero the entire cluster region" */ static void ocfs2_clear_page_regions(struct page *page, struct ocfs2_super *osb, u32 cpos, unsigned from, unsigned to) { void *kaddr; unsigned int cluster_start, cluster_end; ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); kaddr = kmap_atomic(page); if (from || to) { if (from > cluster_start) memset(kaddr + cluster_start, 0, from - cluster_start); if (to < cluster_end) memset(kaddr + to, 0, cluster_end - to); } else { memset(kaddr + cluster_start, 0, cluster_end - cluster_start); } kunmap_atomic(kaddr); } /* * Nonsparse file systems fully allocate before we get to the write * code. This prevents ocfs2_write() from tagging the write as an * allocating one, which means ocfs2_map_page_blocks() might try to * read-in the blocks at the tail of our file. Avoid reading them by * testing i_size against each block offset. */ static int ocfs2_should_read_blk(struct inode *inode, struct page *page, unsigned int block_start) { u64 offset = page_offset(page) + block_start; if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) return 1; if (i_size_read(inode) > offset) return 1; return 0; } /* * Some of this taken from __block_write_begin(). We already have our * mapping by now though, and the entire write will be allocating or * it won't, so not much need to use BH_New. * * This will also skip zeroing, which is handled externally. */ int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, struct inode *inode, unsigned int from, unsigned int to, int new) { int ret = 0; struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; unsigned int block_end, block_start; unsigned int bsize = 1 << inode->i_blkbits; if (!page_has_buffers(page)) create_empty_buffers(page, bsize, 0); head = page_buffers(page); for (bh = head, block_start = 0; bh != head || !block_start; bh = bh->b_this_page, block_start += bsize) { block_end = block_start + bsize; clear_buffer_new(bh); /* * Ignore blocks outside of our i/o range - * they may belong to unallocated clusters. */ if (block_start >= to || block_end <= from) { if (PageUptodate(page)) set_buffer_uptodate(bh); continue; } /* * For an allocating write with cluster size >= page * size, we always write the entire page. */ if (new) set_buffer_new(bh); if (!buffer_mapped(bh)) { map_bh(bh, inode->i_sb, *p_blkno); unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); } if (PageUptodate(page)) { if (!buffer_uptodate(bh)) set_buffer_uptodate(bh); } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && !buffer_new(bh) && ocfs2_should_read_blk(inode, page, block_start) && (block_start < from || block_end > to)) { ll_rw_block(READ, 1, &bh); *wait_bh++=bh; } *p_blkno = *p_blkno + 1; } /* * If we issued read requests - let them complete. */ while(wait_bh > wait) { wait_on_buffer(*--wait_bh); if (!buffer_uptodate(*wait_bh)) ret = -EIO; } if (ret == 0 || !new) return ret; /* * If we get -EIO above, zero out any newly allocated blocks * to avoid exposing stale data. */ bh = head; block_start = 0; do { block_end = block_start + bsize; if (block_end <= from) goto next_bh; if (block_start >= to) break; zero_user(page, block_start, bh->b_size); set_buffer_uptodate(bh); mark_buffer_dirty(bh); next_bh: block_start = block_end; bh = bh->b_this_page; } while (bh != head); return ret; } #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE) #define OCFS2_MAX_CTXT_PAGES 1 #else #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE) #endif #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE) /* * Describe the state of a single cluster to be written to. */ struct ocfs2_write_cluster_desc { u32 c_cpos; u32 c_phys; /* * Give this a unique field because c_phys eventually gets * filled. */ unsigned c_new; unsigned c_unwritten; unsigned c_needs_zero; }; struct ocfs2_write_ctxt { /* Logical cluster position / len of write */ u32 w_cpos; u32 w_clen; /* First cluster allocated in a nonsparse extend */ u32 w_first_new_cpos; struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE]; /* * This is true if page_size > cluster_size. * * It triggers a set of special cases during write which might * have to deal with allocating writes to partial pages. */ unsigned int w_large_pages; /* * Pages involved in this write. * * w_target_page is the page being written to by the user. * * w_pages is an array of pages which always contains * w_target_page, and in the case of an allocating write with * page_size < cluster size, it will contain zero'd and mapped * pages adjacent to w_target_page which need to be written * out in so that future reads from that region will get * zero's. */ unsigned int w_num_pages; struct page *w_pages[OCFS2_MAX_CTXT_PAGES]; struct page *w_target_page; /* * w_target_locked is used for page_mkwrite path indicating no unlocking * against w_target_page in ocfs2_write_end_nolock. */ unsigned int w_target_locked:1; /* * ocfs2_write_end() uses this to know what the real range to * write in the target should be. */ unsigned int w_target_from; unsigned int w_target_to; /* * We could use journal_current_handle() but this is cleaner, * IMHO -Mark */ handle_t *w_handle; struct buffer_head *w_di_bh; struct ocfs2_cached_dealloc_ctxt w_dealloc; }; void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages) { int i; for(i = 0; i < num_pages; i++) { if (pages[i]) { unlock_page(pages[i]); mark_page_accessed(pages[i]); page_cache_release(pages[i]); } } } static void ocfs2_unlock_pages(struct ocfs2_write_ctxt *wc) { int i; /* * w_target_locked is only set to true in the page_mkwrite() case. * The intent is to allow us to lock the target page from write_begin() * to write_end(). The caller must hold a ref on w_target_page. */ if (wc->w_target_locked) { BUG_ON(!wc->w_target_page); for (i = 0; i < wc->w_num_pages; i++) { if (wc->w_target_page == wc->w_pages[i]) { wc->w_pages[i] = NULL; break; } } mark_page_accessed(wc->w_target_page); page_cache_release(wc->w_target_page); } ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages); } static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc) { ocfs2_unlock_pages(wc); brelse(wc->w_di_bh); kfree(wc); } static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp, struct ocfs2_super *osb, loff_t pos, unsigned len, struct buffer_head *di_bh) { u32 cend; struct ocfs2_write_ctxt *wc; wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS); if (!wc) return -ENOMEM; wc->w_cpos = pos >> osb->s_clustersize_bits; wc->w_first_new_cpos = UINT_MAX; cend = (pos + len - 1) >> osb->s_clustersize_bits; wc->w_clen = cend - wc->w_cpos + 1; get_bh(di_bh); wc->w_di_bh = di_bh; if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) wc->w_large_pages = 1; else wc->w_large_pages = 0; ocfs2_init_dealloc_ctxt(&wc->w_dealloc); *wcp = wc; return 0; } /* * If a page has any new buffers, zero them out here, and mark them uptodate * and dirty so they'll be written out (in order to prevent uninitialised * block data from leaking). And clear the new bit. */ static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to) { unsigned int block_start, block_end; struct buffer_head *head, *bh; BUG_ON(!PageLocked(page)); if (!page_has_buffers(page)) return; bh = head = page_buffers(page); block_start = 0; do { block_end = block_start + bh->b_size; if (buffer_new(bh)) { if (block_end > from && block_start < to) { if (!PageUptodate(page)) { unsigned start, end; start = max(from, block_start); end = min(to, block_end); zero_user_segment(page, start, end); set_buffer_uptodate(bh); } clear_buffer_new(bh); mark_buffer_dirty(bh); } } block_start = block_end; bh = bh->b_this_page; } while (bh != head); } /* * Only called when we have a failure during allocating write to write * zero's to the newly allocated region. */ static void ocfs2_write_failure(struct inode *inode, struct ocfs2_write_ctxt *wc, loff_t user_pos, unsigned user_len) { int i; unsigned from = user_pos & (PAGE_CACHE_SIZE - 1), to = user_pos + user_len; struct page *tmppage; ocfs2_zero_new_buffers(wc->w_target_page, from, to); for(i = 0; i < wc->w_num_pages; i++) { tmppage = wc->w_pages[i]; if (page_has_buffers(tmppage)) { if (ocfs2_should_order_data(inode)) ocfs2_jbd2_file_inode(wc->w_handle, inode); block_commit_write(tmppage, from, to); } } } static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno, struct ocfs2_write_ctxt *wc, struct page *page, u32 cpos, loff_t user_pos, unsigned user_len, int new) { int ret; unsigned int map_from = 0, map_to = 0; unsigned int cluster_start, cluster_end; unsigned int user_data_from = 0, user_data_to = 0; ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, &cluster_start, &cluster_end); /* treat the write as new if the a hole/lseek spanned across * the page boundary. */ new = new | ((i_size_read(inode) <= page_offset(page)) && (page_offset(page) <= user_pos)); if (page == wc->w_target_page) { map_from = user_pos & (PAGE_CACHE_SIZE - 1); map_to = map_from + user_len; if (new) ret = ocfs2_map_page_blocks(page, p_blkno, inode, cluster_start, cluster_end, new); else ret = ocfs2_map_page_blocks(page, p_blkno, inode, map_from, map_to, new); if (ret) { mlog_errno(ret); goto out; } user_data_from = map_from; user_data_to = map_to; if (new) { map_from = cluster_start; map_to = cluster_end; } } else { /* * If we haven't allocated the new page yet, we * shouldn't be writing it out without copying user * data. This is likely a math error from the caller. */ BUG_ON(!new); map_from = cluster_start; map_to = cluster_end; ret = ocfs2_map_page_blocks(page, p_blkno, inode, cluster_start, cluster_end, new); if (ret) { mlog_errno(ret); goto out; } } /* * Parts of newly allocated pages need to be zero'd. * * Above, we have also rewritten 'to' and 'from' - as far as * the rest of the function is concerned, the entire cluster * range inside of a page needs to be written. * * We can skip this if the page is up to date - it's already * been zero'd from being read in as a hole. */ if (new && !PageUptodate(page)) ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), cpos, user_data_from, user_data_to); flush_dcache_page(page); out: return ret; } /* * This function will only grab one clusters worth of pages. */ static int ocfs2_grab_pages_for_write(struct address_space *mapping, struct ocfs2_write_ctxt *wc, u32 cpos, loff_t user_pos, unsigned user_len, int new, struct page *mmap_page) { int ret = 0, i; unsigned long start, target_index, end_index, index; struct inode *inode = mapping->host; loff_t last_byte; target_index = user_pos >> PAGE_CACHE_SHIFT; /* * Figure out how many pages we'll be manipulating here. For * non allocating write, we just change the one * page. Otherwise, we'll need a whole clusters worth. If we're * writing past i_size, we only need enough pages to cover the * last page of the write. */ if (new) { wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); /* * We need the index *past* the last page we could possibly * touch. This is the page past the end of the write or * i_size, whichever is greater. */ last_byte = max(user_pos + user_len, i_size_read(inode)); BUG_ON(last_byte < 1); end_index = ((last_byte - 1) >> PAGE_CACHE_SHIFT) + 1; if ((start + wc->w_num_pages) > end_index) wc->w_num_pages = end_index - start; } else { wc->w_num_pages = 1; start = target_index; } for(i = 0; i < wc->w_num_pages; i++) { index = start + i; if (index == target_index && mmap_page) { /* * ocfs2_pagemkwrite() is a little different * and wants us to directly use the page * passed in. */ lock_page(mmap_page); /* Exit and let the caller retry */ if (mmap_page->mapping != mapping) { WARN_ON(mmap_page->mapping); unlock_page(mmap_page); ret = -EAGAIN; goto out; } page_cache_get(mmap_page); wc->w_pages[i] = mmap_page; wc->w_target_locked = true; } else { wc->w_pages[i] = find_or_create_page(mapping, index, GFP_NOFS); if (!wc->w_pages[i]) { ret = -ENOMEM; mlog_errno(ret); goto out; } } wait_for_stable_page(wc->w_pages[i]); if (index == target_index) wc->w_target_page = wc->w_pages[i]; } out: if (ret) wc->w_target_locked = false; return ret; } /* * Prepare a single cluster for write one cluster into the file. */ static int ocfs2_write_cluster(struct address_space *mapping, u32 phys, unsigned int unwritten, unsigned int should_zero, struct ocfs2_alloc_context *data_ac, struct ocfs2_alloc_context *meta_ac, struct ocfs2_write_ctxt *wc, u32 cpos, loff_t user_pos, unsigned user_len) { int ret, i, new; u64 v_blkno, p_blkno; struct inode *inode = mapping->host; struct ocfs2_extent_tree et; new = phys == 0 ? 1 : 0; if (new) { u32 tmp_pos; /* * This is safe to call with the page locks - it won't take * any additional semaphores or cluster locks. */ tmp_pos = cpos; ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode, &tmp_pos, 1, 0, wc->w_di_bh, wc->w_handle, data_ac, meta_ac, NULL); /* * This shouldn't happen because we must have already * calculated the correct meta data allocation required. The * internal tree allocation code should know how to increase * transaction credits itself. * * If need be, we could handle -EAGAIN for a * RESTART_TRANS here. */ mlog_bug_on_msg(ret == -EAGAIN, "Inode %llu: EAGAIN return during allocation.\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); if (ret < 0) { mlog_errno(ret); goto out; } } else if (unwritten) { ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), wc->w_di_bh); ret = ocfs2_mark_extent_written(inode, &et, wc->w_handle, cpos, 1, phys, meta_ac, &wc->w_dealloc); if (ret < 0) { mlog_errno(ret); goto out; } } if (should_zero) v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos); else v_blkno = user_pos >> inode->i_sb->s_blocksize_bits; /* * The only reason this should fail is due to an inability to * find the extent added. */ ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL, NULL); if (ret < 0) { mlog(ML_ERROR, "Get physical blkno failed for inode %llu, " "at logical block %llu", (unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)v_blkno); goto out; } BUG_ON(p_blkno == 0); for(i = 0; i < wc->w_num_pages; i++) { int tmpret; tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, wc->w_pages[i], cpos, user_pos, user_len, should_zero); if (tmpret) { mlog_errno(tmpret); if (ret == 0) ret = tmpret; } } /* * We only have cleanup to do in case of allocating write. */ if (ret && new) ocfs2_write_failure(inode, wc, user_pos, user_len); out: return ret; } static int ocfs2_write_cluster_by_desc(struct address_space *mapping, struct ocfs2_alloc_context *data_ac, struct ocfs2_alloc_context *meta_ac, struct ocfs2_write_ctxt *wc, loff_t pos, unsigned len) { int ret, i; loff_t cluster_off; unsigned int local_len = len; struct ocfs2_write_cluster_desc *desc; struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); for (i = 0; i < wc->w_clen; i++) { desc = &wc->w_desc[i]; /* * We have to make sure that the total write passed in * doesn't extend past a single cluster. */ local_len = len; cluster_off = pos & (osb->s_clustersize - 1); if ((cluster_off + local_len) > osb->s_clustersize) local_len = osb->s_clustersize - cluster_off; ret = ocfs2_write_cluster(mapping, desc->c_phys, desc->c_unwritten, desc->c_needs_zero, data_ac, meta_ac, wc, desc->c_cpos, pos, local_len); if (ret) { mlog_errno(ret); goto out; } len -= local_len; pos += local_len; } ret = 0; out: return ret; } /* * ocfs2_write_end() wants to know which parts of the target page it * should complete the write on. It's easiest to compute them ahead of * time when a more complete view of the write is available. */ static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, struct ocfs2_write_ctxt *wc, loff_t pos, unsigned len, int alloc) { struct ocfs2_write_cluster_desc *desc; wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1); wc->w_target_to = wc->w_target_from + len; if (alloc == 0) return; /* * Allocating write - we may have different boundaries based * on page size and cluster size. * * NOTE: We can no longer compute one value from the other as * the actual write length and user provided length may be * different. */ if (wc->w_large_pages) { /* * We only care about the 1st and last cluster within * our range and whether they should be zero'd or not. Either * value may be extended out to the start/end of a * newly allocated cluster. */ desc = &wc->w_desc[0]; if (desc->c_needs_zero) ocfs2_figure_cluster_boundaries(osb, desc->c_cpos, &wc->w_target_from, NULL); desc = &wc->w_desc[wc->w_clen - 1]; if (desc->c_needs_zero) ocfs2_figure_cluster_boundaries(osb, desc->c_cpos, NULL, &wc->w_target_to); } else { wc->w_target_from = 0; wc->w_target_to = PAGE_CACHE_SIZE; } } /* * Populate each single-cluster write descriptor in the write context * with information about the i/o to be done. * * Returns the number of clusters that will have to be allocated, as * well as a worst case estimate of the number of extent records that * would have to be created during a write to an unwritten region. */ static int ocfs2_populate_write_desc(struct inode *inode, struct ocfs2_write_ctxt *wc, unsigned int *clusters_to_alloc, unsigned int *extents_to_split) { int ret; struct ocfs2_write_cluster_desc *desc; unsigned int num_clusters = 0; unsigned int ext_flags = 0; u32 phys = 0; int i; *clusters_to_alloc = 0; *extents_to_split = 0; for (i = 0; i < wc->w_clen; i++) { desc = &wc->w_desc[i]; desc->c_cpos = wc->w_cpos + i; if (num_clusters == 0) { /* * Need to look up the next extent record. */ ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, &num_clusters, &ext_flags); if (ret) { mlog_errno(ret); goto out; } /* We should already CoW the refcountd extent. */ BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED); /* * Assume worst case - that we're writing in * the middle of the extent. * * We can assume that the write proceeds from * left to right, in which case the extent * insert code is smart enough to coalesce the * next splits into the previous records created. */ if (ext_flags & OCFS2_EXT_UNWRITTEN) *extents_to_split = *extents_to_split + 2; } else if (phys) { /* * Only increment phys if it doesn't describe * a hole. */ phys++; } /* * If w_first_new_cpos is < UINT_MAX, we have a non-sparse * file that got extended. w_first_new_cpos tells us * where the newly allocated clusters are so we can * zero them. */ if (desc->c_cpos >= wc->w_first_new_cpos) { BUG_ON(phys == 0); desc->c_needs_zero = 1; } desc->c_phys = phys; if (phys == 0) { desc->c_new = 1; desc->c_needs_zero = 1; *clusters_to_alloc = *clusters_to_alloc + 1; } if (ext_flags & OCFS2_EXT_UNWRITTEN) { desc->c_unwritten = 1; desc->c_needs_zero = 1; } num_clusters--; } ret = 0; out: return ret; } static int ocfs2_write_begin_inline(struct address_space *mapping, struct inode *inode, struct ocfs2_write_ctxt *wc) { int ret; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct page *page; handle_t *handle; struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out; } page = find_or_create_page(mapping, 0, GFP_NOFS); if (!page) { ocfs2_commit_trans(osb, handle); ret = -ENOMEM; mlog_errno(ret); goto out; } /* * If we don't set w_num_pages then this page won't get unlocked * and freed on cleanup of the write context. */ wc->w_pages[0] = wc->w_target_page = page; wc->w_num_pages = 1; ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { ocfs2_commit_trans(osb, handle); mlog_errno(ret); goto out; } if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) ocfs2_set_inode_data_inline(inode, di); if (!PageUptodate(page)) { ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh); if (ret) { ocfs2_commit_trans(osb, handle); goto out; } } wc->w_handle = handle; out: return ret; } int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size) { struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; if (new_size <= le16_to_cpu(di->id2.i_data.id_count)) return 1; return 0; } static int ocfs2_try_to_write_inline_data(struct address_space *mapping, struct inode *inode, loff_t pos, unsigned len, struct page *mmap_page, struct ocfs2_write_ctxt *wc) { int ret, written = 0; loff_t end = pos + len; struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_dinode *di = NULL; trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno, len, (unsigned long long)pos, oi->ip_dyn_features); /* * Handle inodes which already have inline data 1st. */ if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { if (mmap_page == NULL && ocfs2_size_fits_inline_data(wc->w_di_bh, end)) goto do_inline_write; /* * The write won't fit - we have to give this inode an * inline extent list now. */ ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh); if (ret) mlog_errno(ret); goto out; } /* * Check whether the inode can accept inline data. */ if (oi->ip_clusters != 0 || i_size_read(inode) != 0) return 0; /* * Check whether the write can fit. */ di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; if (mmap_page || end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) return 0; do_inline_write: ret = ocfs2_write_begin_inline(mapping, inode, wc); if (ret) { mlog_errno(ret); goto out; } /* * This signals to the caller that the data can be written * inline. */ written = 1; out: return written ? written : ret; } /* * This function only does anything for file systems which can't * handle sparse files. * * What we want to do here is fill in any hole between the current end


context:
space:
mode: