diff options
| -rw-r--r-- | fs/fat/fat.h | 3 | ||||
| -rw-r--r-- | fs/fat/file.c | 34 | ||||
| -rw-r--r-- | fs/fat/inode.c | 35 |
3 files changed, 57 insertions, 15 deletions
diff --git a/fs/fat/fat.h b/fs/fat/fat.h index a1c8c4b44fdb..27ac25725954 100644 --- a/fs/fat/fat.h +++ b/fs/fat/fat.h @@ -306,7 +306,8 @@ extern long fat_generic_ioctl(struct file *filp, unsigned int cmd, extern const struct file_operations fat_file_operations; extern const struct inode_operations fat_file_inode_operations; extern int fat_setattr(struct dentry * dentry, struct iattr * attr); -extern void fat_truncate(struct inode *inode); +extern int fat_setsize(struct inode *inode, loff_t offset); +extern void fat_truncate_blocks(struct inode *inode, loff_t offset); extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat); extern int fat_file_fsync(struct file *file, int datasync); diff --git a/fs/fat/file.c b/fs/fat/file.c index 8c13b8acfd2f..990dfae022e5 100644 --- a/fs/fat/file.c +++ b/fs/fat/file.c @@ -283,7 +283,7 @@ static int fat_free(struct inode *inode, int skip) return fat_free_clusters(inode, free_start); } -void fat_truncate(struct inode *inode) +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; @@ -293,10 +293,10 @@ void fat_truncate(struct inode *inode) * This protects against truncating a file bigger than it was then * trying to write into the hole. */ - if (MSDOS_I(inode)->mmu_private > inode->i_size) - MSDOS_I(inode)->mmu_private = inode->i_size; + if (MSDOS_I(inode)->mmu_private > offset) + MSDOS_I(inode)->mmu_private = offset; - nr_clusters = (inode->i_size + (cluster_size - 1)) >> sbi->cluster_bits; + nr_clusters = (offset + (cluster_size - 1)) >> sbi->cluster_bits; fat_free(inode, nr_clusters); fat_flush_inodes(inode->i_sb, inode, NULL); @@ -364,6 +364,18 @@ static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode) return 0; } +int fat_setsize(struct inode *inode, loff_t offset) +{ + int error; + + error = simple_setsize(inode, offset); + if (error) + return error; + fat_truncate_blocks(inode, offset); + + return error; +} + #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) @@ -378,7 +390,8 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr) /* * Expand the file. Since inode_setattr() updates ->i_size * before calling the ->truncate(), but FAT needs to fill the - * hole before it. + * hole before it. XXX: this is no longer true with new truncate + * sequence. */ if (attr->ia_valid & ATTR_SIZE) { if (attr->ia_size > inode->i_size) { @@ -427,15 +440,20 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr) attr->ia_valid &= ~ATTR_MODE; } - if (attr->ia_valid) - error = inode_setattr(inode, attr); + if (attr->ia_valid & ATTR_SIZE) { + error = fat_setsize(inode, attr->ia_size); + if (error) + goto out; + } + + generic_setattr(inode, attr); + mark_inode_dirty(inode); out: return error; } EXPORT_SYMBOL_GPL(fat_setattr); const struct inode_operations fat_file_inode_operations = { - .truncate = fat_truncate, .setattr = fat_setattr, .getattr = fat_getattr, }; diff --git a/fs/fat/inode.c b/fs/fat/inode.c index ed33904926ee..7bf45aee56d7 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -142,14 +142,29 @@ static int fat_readpages(struct file *file, struct address_space *mapping, return mpage_readpages(mapping, pages, nr_pages, fat_get_block); } +static void fat_write_failed(struct address_space *mapping, loff_t to) +{ + struct inode *inode = mapping->host; + + if (to > inode->i_size) { + truncate_pagecache(inode, to, inode->i_size); + fat_truncate_blocks(inode, inode->i_size); + } +} + static int fat_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) { + int err; + *pagep = NULL; - return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, - fat_get_block, + err = cont_write_begin_newtrunc(file, mapping, pos, len, flags, + pagep, fsdata, fat_get_block, &MSDOS_I(mapping->host)->mmu_private); + if (err < 0) + fat_write_failed(mapping, pos + len); + return err; } static int fat_write_end(struct file *file, struct address_space *mapping, @@ -159,6 +174,8 @@ static int fat_write_end(struct file *file, struct address_space *mapping, struct inode *inode = mapping->host; int err; err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); + if (err < len) + fat_write_failed(mapping, pos + len); if (!(err < 0) && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) { inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; MSDOS_I(inode)->i_attrs |= ATTR_ARCH; @@ -172,7 +189,9 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb, loff_t offset, unsigned long nr_segs) { struct file *file = iocb->ki_filp; - struct inode *inode = file->f_mapping->host; + struct address_space *mapping = file->f_mapping; + struct inode *inode = mapping->host; + ssize_t ret; if (rw == WRITE) { /* @@ -193,8 +212,12 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb, * FAT need to use the DIO_LOCKING for avoiding the race * condition of fat_get_block() and ->truncate(). */ - return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, - offset, nr_segs, fat_get_block, NULL); + ret = blockdev_direct_IO_newtrunc(rw, iocb, inode, inode->i_sb->s_bdev, + iov, offset, nr_segs, fat_get_block, NULL); + if (ret < 0 && (rw & WRITE)) + fat_write_failed(mapping, offset + iov_length(iov, nr_segs)); + + return ret; } static sector_t _fat_bmap(struct address_space *mapping, sector_t block) @@ -429,7 +452,7 @@ static void fat_delete_inode(struct inode *inode) { truncate_inode_pages(&inode->i_data, 0); inode->i_size = 0; - fat_truncate(inode); + fat_truncate_blocks(inode, 0); clear_inode(inode); } |