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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/fs/jffs2/file.c | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
download | FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.gz FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.bz2 FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.zip |
Moved, renamed, and deleted files
The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/fs/jffs2/file.c')
-rw-r--r-- | ANDROID_3.4.5/fs/jffs2/file.c | 335 |
1 files changed, 0 insertions, 335 deletions
diff --git a/ANDROID_3.4.5/fs/jffs2/file.c b/ANDROID_3.4.5/fs/jffs2/file.c deleted file mode 100644 index db3889ba..00000000 --- a/ANDROID_3.4.5/fs/jffs2/file.c +++ /dev/null @@ -1,335 +0,0 @@ -/* - * JFFS2 -- Journalling Flash File System, Version 2. - * - * Copyright © 2001-2007 Red Hat, Inc. - * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> - * - * Created by David Woodhouse <dwmw2@infradead.org> - * - * For licensing information, see the file 'LICENCE' in this directory. - * - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/kernel.h> -#include <linux/fs.h> -#include <linux/time.h> -#include <linux/pagemap.h> -#include <linux/highmem.h> -#include <linux/crc32.h> -#include <linux/jffs2.h> -#include "nodelist.h" - -static int jffs2_write_end(struct file *filp, struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *pg, void *fsdata); -static int jffs2_write_begin(struct file *filp, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata); -static int jffs2_readpage (struct file *filp, struct page *pg); - -int jffs2_fsync(struct file *filp, loff_t start, loff_t end, int datasync) -{ - struct inode *inode = filp->f_mapping->host; - struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); - int ret; - - ret = filemap_write_and_wait_range(inode->i_mapping, start, end); - if (ret) - return ret; - - mutex_lock(&inode->i_mutex); - /* Trigger GC to flush any pending writes for this inode */ - jffs2_flush_wbuf_gc(c, inode->i_ino); - mutex_unlock(&inode->i_mutex); - - return 0; -} - -const struct file_operations jffs2_file_operations = -{ - .llseek = generic_file_llseek, - .open = generic_file_open, - .read = do_sync_read, - .aio_read = generic_file_aio_read, - .write = do_sync_write, - .aio_write = generic_file_aio_write, - .unlocked_ioctl=jffs2_ioctl, - .mmap = generic_file_readonly_mmap, - .fsync = jffs2_fsync, - .splice_read = generic_file_splice_read, -}; - -/* jffs2_file_inode_operations */ - -const struct inode_operations jffs2_file_inode_operations = -{ - .get_acl = jffs2_get_acl, - .setattr = jffs2_setattr, - .setxattr = jffs2_setxattr, - .getxattr = jffs2_getxattr, - .listxattr = jffs2_listxattr, - .removexattr = jffs2_removexattr -}; - -const struct address_space_operations jffs2_file_address_operations = -{ - .readpage = jffs2_readpage, - .write_begin = jffs2_write_begin, - .write_end = jffs2_write_end, -}; - -static int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg) -{ - struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); - struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); - unsigned char *pg_buf; - int ret; - - jffs2_dbg(2, "%s(): ino #%lu, page at offset 0x%lx\n", - __func__, inode->i_ino, pg->index << PAGE_CACHE_SHIFT); - - BUG_ON(!PageLocked(pg)); - - pg_buf = kmap(pg); - /* FIXME: Can kmap fail? */ - - ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); - - if (ret) { - ClearPageUptodate(pg); - SetPageError(pg); - } else { - SetPageUptodate(pg); - ClearPageError(pg); - } - - flush_dcache_page(pg); - kunmap(pg); - - jffs2_dbg(2, "readpage finished\n"); - return ret; -} - -int jffs2_do_readpage_unlock(struct inode *inode, struct page *pg) -{ - int ret = jffs2_do_readpage_nolock(inode, pg); - unlock_page(pg); - return ret; -} - - -static int jffs2_readpage (struct file *filp, struct page *pg) -{ - struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host); - int ret; - - mutex_lock(&f->sem); - ret = jffs2_do_readpage_unlock(pg->mapping->host, pg); - mutex_unlock(&f->sem); - return ret; -} - -static int jffs2_write_begin(struct file *filp, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata) -{ - struct page *pg; - struct inode *inode = mapping->host; - struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); - pgoff_t index = pos >> PAGE_CACHE_SHIFT; - uint32_t pageofs = index << PAGE_CACHE_SHIFT; - int ret = 0; - - pg = grab_cache_page_write_begin(mapping, index, flags); - if (!pg) - return -ENOMEM; - *pagep = pg; - - jffs2_dbg(1, "%s()\n", __func__); - - if (pageofs > inode->i_size) { - /* Make new hole frag from old EOF to new page */ - struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); - struct jffs2_raw_inode ri; - struct jffs2_full_dnode *fn; - uint32_t alloc_len; - - jffs2_dbg(1, "Writing new hole frag 0x%x-0x%x between current EOF and new page\n", - (unsigned int)inode->i_size, pageofs); - - ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len, - ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); - if (ret) - goto out_page; - - mutex_lock(&f->sem); - memset(&ri, 0, sizeof(ri)); - - ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); - ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); - ri.totlen = cpu_to_je32(sizeof(ri)); - ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4)); - - ri.ino = cpu_to_je32(f->inocache->ino); - ri.version = cpu_to_je32(++f->highest_version); - ri.mode = cpu_to_jemode(inode->i_mode); - ri.uid = cpu_to_je16(inode->i_uid); - ri.gid = cpu_to_je16(inode->i_gid); - ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs)); - ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds()); - ri.offset = cpu_to_je32(inode->i_size); - ri.dsize = cpu_to_je32(pageofs - inode->i_size); - ri.csize = cpu_to_je32(0); - ri.compr = JFFS2_COMPR_ZERO; - ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8)); - ri.data_crc = cpu_to_je32(0); - - fn = jffs2_write_dnode(c, f, &ri, NULL, 0, ALLOC_NORMAL); - - if (IS_ERR(fn)) { - ret = PTR_ERR(fn); - jffs2_complete_reservation(c); - mutex_unlock(&f->sem); - goto out_page; - } - ret = jffs2_add_full_dnode_to_inode(c, f, fn); - if (f->metadata) { - jffs2_mark_node_obsolete(c, f->metadata->raw); - jffs2_free_full_dnode(f->metadata); - f->metadata = NULL; - } - if (ret) { - jffs2_dbg(1, "Eep. add_full_dnode_to_inode() failed in write_begin, returned %d\n", - ret); - jffs2_mark_node_obsolete(c, fn->raw); - jffs2_free_full_dnode(fn); - jffs2_complete_reservation(c); - mutex_unlock(&f->sem); - goto out_page; - } - jffs2_complete_reservation(c); - inode->i_size = pageofs; - mutex_unlock(&f->sem); - } - - /* - * Read in the page if it wasn't already present. Cannot optimize away - * the whole page write case until jffs2_write_end can handle the - * case of a short-copy. - */ - if (!PageUptodate(pg)) { - mutex_lock(&f->sem); - ret = jffs2_do_readpage_nolock(inode, pg); - mutex_unlock(&f->sem); - if (ret) - goto out_page; - } - jffs2_dbg(1, "end write_begin(). pg->flags %lx\n", pg->flags); - return ret; - -out_page: - unlock_page(pg); - page_cache_release(pg); - return ret; -} - -static int jffs2_write_end(struct file *filp, struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *pg, void *fsdata) -{ - /* Actually commit the write from the page cache page we're looking at. - * For now, we write the full page out each time. It sucks, but it's simple - */ - struct inode *inode = mapping->host; - struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); - struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); - struct jffs2_raw_inode *ri; - unsigned start = pos & (PAGE_CACHE_SIZE - 1); - unsigned end = start + copied; - unsigned aligned_start = start & ~3; - int ret = 0; - uint32_t writtenlen = 0; - - jffs2_dbg(1, "%s(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n", - __func__, inode->i_ino, pg->index << PAGE_CACHE_SHIFT, - start, end, pg->flags); - - /* We need to avoid deadlock with page_cache_read() in - jffs2_garbage_collect_pass(). So the page must be - up to date to prevent page_cache_read() from trying - to re-lock it. */ - BUG_ON(!PageUptodate(pg)); - - if (end == PAGE_CACHE_SIZE) { - /* When writing out the end of a page, write out the - _whole_ page. This helps to reduce the number of - nodes in files which have many short writes, like - syslog files. */ - aligned_start = 0; - } - - ri = jffs2_alloc_raw_inode(); - - if (!ri) { - jffs2_dbg(1, "%s(): Allocation of raw inode failed\n", - __func__); - unlock_page(pg); - page_cache_release(pg); - return -ENOMEM; - } - - /* Set the fields that the generic jffs2_write_inode_range() code can't find */ - ri->ino = cpu_to_je32(inode->i_ino); - ri->mode = cpu_to_jemode(inode->i_mode); - ri->uid = cpu_to_je16(inode->i_uid); - ri->gid = cpu_to_je16(inode->i_gid); - ri->isize = cpu_to_je32((uint32_t)inode->i_size); - ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds()); - - /* In 2.4, it was already kmapped by generic_file_write(). Doesn't - hurt to do it again. The alternative is ifdefs, which are ugly. */ - kmap(pg); - - ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start, - (pg->index << PAGE_CACHE_SHIFT) + aligned_start, - end - aligned_start, &writtenlen); - - kunmap(pg); - - if (ret) { - /* There was an error writing. */ - SetPageError(pg); - } - - /* Adjust writtenlen for the padding we did, so we don't confuse our caller */ - writtenlen -= min(writtenlen, (start - aligned_start)); - - if (writtenlen) { - if (inode->i_size < pos + writtenlen) { - inode->i_size = pos + writtenlen; - inode->i_blocks = (inode->i_size + 511) >> 9; - - inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime)); - } - } - - jffs2_free_raw_inode(ri); - - if (start+writtenlen < end) { - /* generic_file_write has written more to the page cache than we've - actually written to the medium. Mark the page !Uptodate so that - it gets reread */ - jffs2_dbg(1, "%s(): Not all bytes written. Marking page !uptodate\n", - __func__); - SetPageError(pg); - ClearPageUptodate(pg); - } - - jffs2_dbg(1, "%s() returning %d\n", - __func__, writtenlen > 0 ? writtenlen : ret); - unlock_page(pg); - page_cache_release(pg); - return writtenlen > 0 ? writtenlen : ret; -} |