diff options
Diffstat (limited to 'fs/fat/file.c')
| -rw-r--r-- | fs/fat/file.c | 38 |
1 files changed, 32 insertions, 6 deletions
diff --git a/fs/fat/file.c b/fs/fat/file.c index 7134403d5be255..e99c5a73b39e6f 100644 --- a/fs/fat/file.c +++ b/fs/fat/file.c @@ -6,11 +6,13 @@ * regular file handling primitives for fat-based filesystems */ +#include <linux/capability.h> #include <linux/module.h> #include <linux/time.h> #include <linux/msdos_fs.h> #include <linux/smp_lock.h> #include <linux/buffer_head.h> +#include <linux/writeback.h> int fat_generic_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) @@ -40,7 +42,7 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp, if (err) return err; - down(&inode->i_sem); + mutex_lock(&inode->i_mutex); if (IS_RDONLY(inode)) { err = -EROFS; @@ -102,7 +104,7 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp, MSDOS_I(inode)->i_attrs = attr & ATTR_UNUSED; mark_inode_dirty(inode); up: - up(&inode->i_sem); + mutex_unlock(&inode->i_mutex); return err; } default: @@ -124,6 +126,24 @@ struct file_operations fat_file_operations = { .sendfile = generic_file_sendfile, }; +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)) + err = sync_page_range_nolock(inode, mapping, start, count); +out: + return err; +} + int fat_notify_change(struct dentry *dentry, struct iattr *attr) { struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb); @@ -132,11 +152,17 @@ int fat_notify_change(struct dentry *dentry, struct iattr *attr) lock_kernel(); - /* FAT cannot truncate to a longer file */ + /* + * Expand the file. Since inode_setattr() updates ->i_size + * before calling the ->truncate(), but FAT needs to fill the + * hole before it. + */ if (attr->ia_valid & ATTR_SIZE) { if (attr->ia_size > inode->i_size) { - error = -EPERM; - goto out; + error = fat_cont_expand(inode, attr->ia_size); + if (error || attr->ia_valid == ATTR_SIZE) + goto out; + attr->ia_valid &= ~ATTR_SIZE; } } @@ -173,7 +199,7 @@ out: return error; } -EXPORT_SYMBOL(fat_notify_change); +EXPORT_SYMBOL_GPL(fat_notify_change); /* Free all clusters after the skip'th cluster. */ static int fat_free(struct inode *inode, int skip) |