[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/fs/fat/file.c b/ap/os/linux/linux-3.4.x/fs/fat/file.c
new file mode 100644
index 0000000..a71fe37
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/fat/file.c
@@ -0,0 +1,450 @@
+/*
+ * linux/fs/fat/file.c
+ *
+ * Written 1992,1993 by Werner Almesberger
+ *
+ * regular file handling primitives for fat-based filesystems
+ */
+
+#include <linux/capability.h>
+#include <linux/module.h>
+#include <linux/compat.h>
+#include <linux/mount.h>
+#include <linux/time.h>
+#include <linux/buffer_head.h>
+#include <linux/writeback.h>
+#include <linux/backing-dev.h>
+#include <linux/blkdev.h>
+#include <linux/fsnotify.h>
+#include <linux/security.h>
+#include "fat.h"
+
+static int fat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
+{
+ u32 attr;
+
+ mutex_lock(&inode->i_mutex);
+ attr = fat_make_attrs(inode);
+ mutex_unlock(&inode->i_mutex);
+
+ return put_user(attr, user_attr);
+}
+
+static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+ int is_dir = S_ISDIR(inode->i_mode);
+ u32 attr, oldattr;
+ struct iattr ia;
+ int err;
+
+ err = get_user(attr, user_attr);
+ if (err)
+ goto out;
+
+ mutex_lock(&inode->i_mutex);
+ err = mnt_want_write_file(file);
+ if (err)
+ goto out_unlock_inode;
+
+ /*
+ * ATTR_VOLUME and ATTR_DIR cannot be changed; this also
+ * prevents the user from turning us into a VFAT
+ * longname entry. Also, we obviously can't set
+ * any of the NTFS attributes in the high 24 bits.
+ */
+ attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
+ /* Merge in ATTR_VOLUME and ATTR_DIR */
+ attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
+ (is_dir ? ATTR_DIR : 0);
+ oldattr = fat_make_attrs(inode);
+
+ /* Equivalent to a chmod() */
+ ia.ia_valid = ATTR_MODE | ATTR_CTIME;
+ ia.ia_ctime = current_fs_time(inode->i_sb);
+ if (is_dir)
+ ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
+ else {
+ ia.ia_mode = fat_make_mode(sbi, attr,
+ S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO));
+ }
+
+ /* The root directory has no attributes */
+ if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
+ err = -EINVAL;
+ goto out_drop_write;
+ }
+
+ if (sbi->options.sys_immutable &&
+ ((attr | oldattr) & ATTR_SYS) &&
+ !capable(CAP_LINUX_IMMUTABLE)) {
+ err = -EPERM;
+ goto out_drop_write;
+ }
+
+ /*
+ * The security check is questionable... We single
+ * out the RO attribute for checking by the security
+ * module, just because it maps to a file mode.
+ */
+ err = security_inode_setattr(file->f_path.dentry, &ia);
+ if (err)
+ goto out_drop_write;
+
+ /* This MUST be done before doing anything irreversible... */
+ err = fat_setattr(file->f_path.dentry, &ia);
+ if (err)
+ goto out_drop_write;
+
+ fsnotify_change(file->f_path.dentry, ia.ia_valid);
+ if (sbi->options.sys_immutable) {
+ if (attr & ATTR_SYS)
+ inode->i_flags |= S_IMMUTABLE;
+ else
+ inode->i_flags &= ~S_IMMUTABLE;
+ }
+
+ fat_save_attrs(inode, attr);
+ mark_inode_dirty(inode);
+out_drop_write:
+ mnt_drop_write_file(file);
+out_unlock_inode:
+ mutex_unlock(&inode->i_mutex);
+out:
+ return err;
+}
+
+long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ u32 __user *user_attr = (u32 __user *)arg;
+
+ switch (cmd) {
+ case FAT_IOCTL_GET_ATTRIBUTES:
+ return fat_ioctl_get_attributes(inode, user_attr);
+ case FAT_IOCTL_SET_ATTRIBUTES:
+ return fat_ioctl_set_attributes(filp, user_attr);
+ default:
+ return -ENOTTY; /* Inappropriate ioctl for device */
+ }
+}
+
+#ifdef CONFIG_COMPAT
+static long fat_generic_compat_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long arg)
+
+{
+ return fat_generic_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
+static int fat_file_release(struct inode *inode, struct file *filp)
+{
+ if ((filp->f_mode & FMODE_WRITE) &&
+ MSDOS_SB(inode->i_sb)->options.flush) {
+ fat_flush_inodes(inode->i_sb, inode, NULL);
+ congestion_wait(BLK_RW_ASYNC, HZ/10);
+ }
+ return 0;
+}
+
+int fat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
+{
+ struct inode *inode = filp->f_mapping->host;
+ int res, err;
+
+ res = generic_file_fsync(filp, start, end, datasync);
+ err = sync_mapping_buffers(MSDOS_SB(inode->i_sb)->fat_inode->i_mapping);
+
+ return res ? res : err;
+}
+
+
+const struct file_operations fat_file_operations = {
+ .llseek = generic_file_llseek,
+ .read = do_sync_read,
+ .write = do_sync_write,
+ .aio_read = generic_file_aio_read,
+ .aio_write = generic_file_aio_write,
+ .mmap = generic_file_mmap,
+ .release = fat_file_release,
+ .unlocked_ioctl = fat_generic_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = fat_generic_compat_ioctl,
+#endif
+ .fsync = fat_file_fsync,
+ .splice_read = generic_file_splice_read,
+};
+
+static int fat_cont_expand(struct inode *inode, loff_t size)
+{
+ struct address_space *mapping = inode->i_mapping;
+ loff_t start = inode->i_size, count = size - inode->i_size;
+ int err;
+
+ err = generic_cont_expand_simple(inode, size);
+ if (err)
+ goto out;
+
+ inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+ mark_inode_dirty(inode);
+ if (IS_SYNC(inode)) {
+ int err2;
+
+ /*
+ * Opencode syncing since we don't have a file open to use
+ * standard fsync path.
+ */
+ err = filemap_fdatawrite_range(mapping, start,
+ start + count - 1);
+ err2 = sync_mapping_buffers(mapping);
+ if (!err)
+ err = err2;
+ err2 = write_inode_now(inode, 1);
+ if (!err)
+ err = err2;
+ if (!err) {
+ err = filemap_fdatawait_range(mapping, start,
+ start + count - 1);
+ }
+ }
+out:
+ return err;
+}
+
+/* Free all clusters after the skip'th cluster. */
+static int fat_free(struct inode *inode, int skip)
+{
+ struct super_block *sb = inode->i_sb;
+ int err, wait, free_start, i_start, i_logstart;
+
+ if (MSDOS_I(inode)->i_start == 0)
+ return 0;
+
+ fat_cache_inval_inode(inode);
+
+ wait = IS_DIRSYNC(inode);
+ i_start = free_start = MSDOS_I(inode)->i_start;
+ i_logstart = MSDOS_I(inode)->i_logstart;
+
+ /* First, we write the new file size. */
+ if (!skip) {
+ MSDOS_I(inode)->i_start = 0;
+ MSDOS_I(inode)->i_logstart = 0;
+ }
+ MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
+ inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+ if (wait) {
+ err = fat_sync_inode(inode);
+ if (err) {
+ MSDOS_I(inode)->i_start = i_start;
+ MSDOS_I(inode)->i_logstart = i_logstart;
+ return err;
+ }
+ } else
+ mark_inode_dirty(inode);
+
+ /* Write a new EOF, and get the remaining cluster chain for freeing. */
+ if (skip) {
+ struct fat_entry fatent;
+ int ret, fclus, dclus;
+
+ ret = fat_get_cluster(inode, skip - 1, &fclus, &dclus);
+ if (ret < 0)
+ return ret;
+ else if (ret == FAT_ENT_EOF)
+ return 0;
+
+ fatent_init(&fatent);
+ ret = fat_ent_read(inode, &fatent, dclus);
+ if (ret == FAT_ENT_EOF) {
+ fatent_brelse(&fatent);
+ return 0;
+ } else if (ret == FAT_ENT_FREE) {
+ fat_fs_error(sb,
+ "%s: invalid cluster chain (i_pos %lld)",
+ __func__, MSDOS_I(inode)->i_pos);
+ ret = -EIO;
+ } else if (ret > 0) {
+ err = fat_ent_write(inode, &fatent, FAT_ENT_EOF, wait);
+ if (err)
+ ret = err;
+ }
+ fatent_brelse(&fatent);
+ if (ret < 0)
+ return ret;
+
+ free_start = ret;
+ }
+ inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits - 9);
+
+ /* Freeing the remained cluster chain */
+ return fat_free_clusters(inode, free_start);
+}
+
+void fat_truncate_blocks(struct inode *inode, loff_t offset)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+ const unsigned int cluster_size = sbi->cluster_size;
+ int nr_clusters;
+
+ /*
+ * This protects against truncating a file bigger than it was then
+ * trying to write into the hole.
+ */
+ if (MSDOS_I(inode)->mmu_private > offset)
+ MSDOS_I(inode)->mmu_private = offset;
+
+ nr_clusters = (offset + (cluster_size - 1)) >> sbi->cluster_bits;
+
+ fat_free(inode, nr_clusters);
+ fat_flush_inodes(inode->i_sb, inode, NULL);
+}
+
+int fat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
+{
+ struct inode *inode = dentry->d_inode;
+ generic_fillattr(inode, stat);
+ stat->blksize = MSDOS_SB(inode->i_sb)->cluster_size;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fat_getattr);
+
+static int fat_sanitize_mode(const struct msdos_sb_info *sbi,
+ struct inode *inode, umode_t *mode_ptr)
+{
+ umode_t mask, perm;
+
+ /*
+ * Note, the basic check is already done by a caller of
+ * (attr->ia_mode & ~FAT_VALID_MODE)
+ */
+
+ if (S_ISREG(inode->i_mode))
+ mask = sbi->options.fs_fmask;
+ else
+ mask = sbi->options.fs_dmask;
+
+ perm = *mode_ptr & ~(S_IFMT | mask);
+
+ /*
+ * Of the r and x bits, all (subject to umask) must be present. Of the
+ * w bits, either all (subject to umask) or none must be present.
+ *
+ * If fat_mode_can_hold_ro(inode) is false, can't change w bits.
+ */
+ if ((perm & (S_IRUGO | S_IXUGO)) != (inode->i_mode & (S_IRUGO|S_IXUGO)))
+ return -EPERM;
+ if (fat_mode_can_hold_ro(inode)) {
+ if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask)))
+ return -EPERM;
+ } else {
+ if ((perm & S_IWUGO) != (S_IWUGO & ~mask))
+ return -EPERM;
+ }
+
+ *mode_ptr &= S_IFMT | perm;
+
+ return 0;
+}
+
+static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode)
+{
+ umode_t allow_utime = sbi->options.allow_utime;
+
+ if (current_fsuid() != inode->i_uid) {
+ if (in_group_p(inode->i_gid))
+ allow_utime >>= 3;
+ if (allow_utime & MAY_WRITE)
+ return 1;
+ }
+
+ /* use a default check */
+ return 0;
+}
+
+#define TIMES_SET_FLAGS (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)
+/* valid file mode bits */
+#define FAT_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXUGO)
+
+int fat_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
+ struct inode *inode = dentry->d_inode;
+ unsigned int ia_valid;
+ int error;
+
+ /* Check for setting the inode time. */
+ ia_valid = attr->ia_valid;
+ if (ia_valid & TIMES_SET_FLAGS) {
+ if (fat_allow_set_time(sbi, inode))
+ attr->ia_valid &= ~TIMES_SET_FLAGS;
+ }
+
+ error = inode_change_ok(inode, attr);
+ attr->ia_valid = ia_valid;
+ if (error) {
+ if (sbi->options.quiet)
+ error = 0;
+ goto out;
+ }
+
+ /*
+ * Expand the file. Since inode_setattr() updates ->i_size
+ * before calling the ->truncate(), but FAT needs to fill the
+ * hole before it. XXX: this is no longer true with new truncate
+ * sequence.
+ */
+ if (attr->ia_valid & ATTR_SIZE) {
+ inode_dio_wait(inode);
+
+ if (attr->ia_size > inode->i_size) {
+ error = fat_cont_expand(inode, attr->ia_size);
+ if (error || attr->ia_valid == ATTR_SIZE)
+ goto out;
+ attr->ia_valid &= ~ATTR_SIZE;
+ }
+ }
+
+ if (((attr->ia_valid & ATTR_UID) &&
+ (attr->ia_uid != sbi->options.fs_uid)) ||
+ ((attr->ia_valid & ATTR_GID) &&
+ (attr->ia_gid != sbi->options.fs_gid)) ||
+ ((attr->ia_valid & ATTR_MODE) &&
+ (attr->ia_mode & ~FAT_VALID_MODE)))
+ error = -EPERM;
+
+ if (error) {
+ if (sbi->options.quiet)
+ error = 0;
+ goto out;
+ }
+
+ /*
+ * We don't return -EPERM here. Yes, strange, but this is too
+ * old behavior.
+ */
+ if (attr->ia_valid & ATTR_MODE) {
+ if (fat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
+ attr->ia_valid &= ~ATTR_MODE;
+ }
+
+ if (attr->ia_valid & ATTR_SIZE) {
+ down_write(&MSDOS_I(inode)->truncate_lock);
+ truncate_setsize(inode, attr->ia_size);
+ fat_truncate_blocks(inode, attr->ia_size);
+ up_write(&MSDOS_I(inode)->truncate_lock);
+ }
+
+ setattr_copy(inode, attr);
+ mark_inode_dirty(inode);
+out:
+ return error;
+}
+EXPORT_SYMBOL_GPL(fat_setattr);
+
+const struct inode_operations fat_file_inode_operations = {
+ .setattr = fat_setattr,
+ .getattr = fat_getattr,
+};