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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/adfs/inode.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/adfs/inode.c')
-rw-r--r-- | ANDROID_3.4.5/fs/adfs/inode.c | 366 |
1 files changed, 0 insertions, 366 deletions
diff --git a/ANDROID_3.4.5/fs/adfs/inode.c b/ANDROID_3.4.5/fs/adfs/inode.c deleted file mode 100644 index 1dab6a17..00000000 --- a/ANDROID_3.4.5/fs/adfs/inode.c +++ /dev/null @@ -1,366 +0,0 @@ -/* - * linux/fs/adfs/inode.c - * - * Copyright (C) 1997-1999 Russell King - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#include <linux/buffer_head.h> -#include <linux/writeback.h> -#include "adfs.h" - -/* - * Lookup/Create a block at offset 'block' into 'inode'. We currently do - * not support creation of new blocks, so we return -EIO for this case. - */ -static int -adfs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh, - int create) -{ - if (!create) { - if (block >= inode->i_blocks) - goto abort_toobig; - - block = __adfs_block_map(inode->i_sb, inode->i_ino, block); - if (block) - map_bh(bh, inode->i_sb, block); - return 0; - } - /* don't support allocation of blocks yet */ - return -EIO; - -abort_toobig: - return 0; -} - -static int adfs_writepage(struct page *page, struct writeback_control *wbc) -{ - return block_write_full_page(page, adfs_get_block, wbc); -} - -static int adfs_readpage(struct file *file, struct page *page) -{ - return block_read_full_page(page, adfs_get_block); -} - -static int adfs_write_begin(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata) -{ - int ret; - - *pagep = NULL; - ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, - adfs_get_block, - &ADFS_I(mapping->host)->mmu_private); - if (unlikely(ret)) { - loff_t isize = mapping->host->i_size; - if (pos + len > isize) - vmtruncate(mapping->host, isize); - } - - return ret; -} - -static sector_t _adfs_bmap(struct address_space *mapping, sector_t block) -{ - return generic_block_bmap(mapping, block, adfs_get_block); -} - -static const struct address_space_operations adfs_aops = { - .readpage = adfs_readpage, - .writepage = adfs_writepage, - .write_begin = adfs_write_begin, - .write_end = generic_write_end, - .bmap = _adfs_bmap -}; - -/* - * Convert ADFS attributes and filetype to Linux permission. - */ -static umode_t -adfs_atts2mode(struct super_block *sb, struct inode *inode) -{ - unsigned int attr = ADFS_I(inode)->attr; - umode_t mode, rmask; - struct adfs_sb_info *asb = ADFS_SB(sb); - - if (attr & ADFS_NDA_DIRECTORY) { - mode = S_IRUGO & asb->s_owner_mask; - return S_IFDIR | S_IXUGO | mode; - } - - switch (ADFS_I(inode)->filetype) { - case 0xfc0: /* LinkFS */ - return S_IFLNK|S_IRWXUGO; - - case 0xfe6: /* UnixExec */ - rmask = S_IRUGO | S_IXUGO; - break; - - default: - rmask = S_IRUGO; - } - - mode = S_IFREG; - - if (attr & ADFS_NDA_OWNER_READ) - mode |= rmask & asb->s_owner_mask; - - if (attr & ADFS_NDA_OWNER_WRITE) - mode |= S_IWUGO & asb->s_owner_mask; - - if (attr & ADFS_NDA_PUBLIC_READ) - mode |= rmask & asb->s_other_mask; - - if (attr & ADFS_NDA_PUBLIC_WRITE) - mode |= S_IWUGO & asb->s_other_mask; - return mode; -} - -/* - * Convert Linux permission to ADFS attribute. We try to do the reverse - * of atts2mode, but there is not a 1:1 translation. - */ -static int -adfs_mode2atts(struct super_block *sb, struct inode *inode) -{ - umode_t mode; - int attr; - struct adfs_sb_info *asb = ADFS_SB(sb); - - /* FIXME: should we be able to alter a link? */ - if (S_ISLNK(inode->i_mode)) - return ADFS_I(inode)->attr; - - if (S_ISDIR(inode->i_mode)) - attr = ADFS_NDA_DIRECTORY; - else - attr = 0; - - mode = inode->i_mode & asb->s_owner_mask; - if (mode & S_IRUGO) - attr |= ADFS_NDA_OWNER_READ; - if (mode & S_IWUGO) - attr |= ADFS_NDA_OWNER_WRITE; - - mode = inode->i_mode & asb->s_other_mask; - mode &= ~asb->s_owner_mask; - if (mode & S_IRUGO) - attr |= ADFS_NDA_PUBLIC_READ; - if (mode & S_IWUGO) - attr |= ADFS_NDA_PUBLIC_WRITE; - - return attr; -} - -/* - * Convert an ADFS time to Unix time. ADFS has a 40-bit centi-second time - * referenced to 1 Jan 1900 (til 2248) so we need to discard 2208988800 seconds - * of time to convert from RISC OS epoch to Unix epoch. - */ -static void -adfs_adfs2unix_time(struct timespec *tv, struct inode *inode) -{ - unsigned int high, low; - /* 01 Jan 1970 00:00:00 (Unix epoch) as nanoseconds since - * 01 Jan 1900 00:00:00 (RISC OS epoch) - */ - static const s64 nsec_unix_epoch_diff_risc_os_epoch = - 2208988800000000000LL; - s64 nsec; - - if (ADFS_I(inode)->stamped == 0) - goto cur_time; - - high = ADFS_I(inode)->loadaddr & 0xFF; /* top 8 bits of timestamp */ - low = ADFS_I(inode)->execaddr; /* bottom 32 bits of timestamp */ - - /* convert 40-bit centi-seconds to 32-bit seconds - * going via nanoseconds to retain precision - */ - nsec = (((s64) high << 32) | (s64) low) * 10000000; /* cs to ns */ - - /* Files dated pre 01 Jan 1970 00:00:00. */ - if (nsec < nsec_unix_epoch_diff_risc_os_epoch) - goto too_early; - - /* convert from RISC OS to Unix epoch */ - nsec -= nsec_unix_epoch_diff_risc_os_epoch; - - *tv = ns_to_timespec(nsec); - return; - - cur_time: - *tv = CURRENT_TIME; - return; - - too_early: - tv->tv_sec = tv->tv_nsec = 0; - return; -} - -/* - * Convert an Unix time to ADFS time. We only do this if the entry has a - * time/date stamp already. - */ -static void -adfs_unix2adfs_time(struct inode *inode, unsigned int secs) -{ - unsigned int high, low; - - if (ADFS_I(inode)->stamped) { - /* convert 32-bit seconds to 40-bit centi-seconds */ - low = (secs & 255) * 100; - high = (secs / 256) * 100 + (low >> 8) + 0x336e996a; - - ADFS_I(inode)->loadaddr = (high >> 24) | - (ADFS_I(inode)->loadaddr & ~0xff); - ADFS_I(inode)->execaddr = (low & 255) | (high << 8); - } -} - -/* - * Fill in the inode information from the object information. - * - * Note that this is an inode-less filesystem, so we can't use the inode - * number to reference the metadata on the media. Instead, we use the - * inode number to hold the object ID, which in turn will tell us where - * the data is held. We also save the parent object ID, and with these - * two, we can locate the metadata. - * - * This does mean that we rely on an objects parent remaining the same at - * all times - we cannot cope with a cross-directory rename (yet). - */ -struct inode * -adfs_iget(struct super_block *sb, struct object_info *obj) -{ - struct inode *inode; - - inode = new_inode(sb); - if (!inode) - goto out; - - inode->i_uid = ADFS_SB(sb)->s_uid; - inode->i_gid = ADFS_SB(sb)->s_gid; - inode->i_ino = obj->file_id; - inode->i_size = obj->size; - set_nlink(inode, 2); - inode->i_blocks = (inode->i_size + sb->s_blocksize - 1) >> - sb->s_blocksize_bits; - - /* - * we need to save the parent directory ID so that - * write_inode can update the directory information - * for this file. This will need special handling - * for cross-directory renames. - */ - ADFS_I(inode)->parent_id = obj->parent_id; - ADFS_I(inode)->loadaddr = obj->loadaddr; - ADFS_I(inode)->execaddr = obj->execaddr; - ADFS_I(inode)->attr = obj->attr; - ADFS_I(inode)->filetype = obj->filetype; - ADFS_I(inode)->stamped = ((obj->loadaddr & 0xfff00000) == 0xfff00000); - - inode->i_mode = adfs_atts2mode(sb, inode); - adfs_adfs2unix_time(&inode->i_mtime, inode); - inode->i_atime = inode->i_mtime; - inode->i_ctime = inode->i_mtime; - - if (S_ISDIR(inode->i_mode)) { - inode->i_op = &adfs_dir_inode_operations; - inode->i_fop = &adfs_dir_operations; - } else if (S_ISREG(inode->i_mode)) { - inode->i_op = &adfs_file_inode_operations; - inode->i_fop = &adfs_file_operations; - inode->i_mapping->a_ops = &adfs_aops; - ADFS_I(inode)->mmu_private = inode->i_size; - } - - insert_inode_hash(inode); - -out: - return inode; -} - -/* - * Validate and convert a changed access mode/time to their ADFS equivalents. - * adfs_write_inode will actually write the information back to the directory - * later. - */ -int -adfs_notify_change(struct dentry *dentry, struct iattr *attr) -{ - struct inode *inode = dentry->d_inode; - struct super_block *sb = inode->i_sb; - unsigned int ia_valid = attr->ia_valid; - int error; - - error = inode_change_ok(inode, attr); - - /* - * we can't change the UID or GID of any file - - * we have a global UID/GID in the superblock - */ - if ((ia_valid & ATTR_UID && attr->ia_uid != ADFS_SB(sb)->s_uid) || - (ia_valid & ATTR_GID && attr->ia_gid != ADFS_SB(sb)->s_gid)) - error = -EPERM; - - if (error) - goto out; - - /* XXX: this is missing some actual on-disk truncation.. */ - if (ia_valid & ATTR_SIZE) - truncate_setsize(inode, attr->ia_size); - - if (ia_valid & ATTR_MTIME) { - inode->i_mtime = attr->ia_mtime; - adfs_unix2adfs_time(inode, attr->ia_mtime.tv_sec); - } - /* - * FIXME: should we make these == to i_mtime since we don't - * have the ability to represent them in our filesystem? - */ - if (ia_valid & ATTR_ATIME) - inode->i_atime = attr->ia_atime; - if (ia_valid & ATTR_CTIME) - inode->i_ctime = attr->ia_ctime; - if (ia_valid & ATTR_MODE) { - ADFS_I(inode)->attr = adfs_mode2atts(sb, inode); - inode->i_mode = adfs_atts2mode(sb, inode); - } - - /* - * FIXME: should we be marking this inode dirty even if - * we don't have any metadata to write back? - */ - if (ia_valid & (ATTR_SIZE | ATTR_MTIME | ATTR_MODE)) - mark_inode_dirty(inode); -out: - return error; -} - -/* - * write an existing inode back to the directory, and therefore the disk. - * The adfs-specific inode data has already been updated by - * adfs_notify_change() - */ -int adfs_write_inode(struct inode *inode, struct writeback_control *wbc) -{ - struct super_block *sb = inode->i_sb; - struct object_info obj; - int ret; - - obj.file_id = inode->i_ino; - obj.name_len = 0; - obj.parent_id = ADFS_I(inode)->parent_id; - obj.loadaddr = ADFS_I(inode)->loadaddr; - obj.execaddr = ADFS_I(inode)->execaddr; - obj.attr = ADFS_I(inode)->attr; - obj.size = inode->i_size; - - ret = adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL); - return ret; -} |