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ext2: convert to use the new truncate convention.
I also have commented a possible bug in existing ext2 code, marked with XXX. Cc: linux-ext4@vger.kernel.org Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
npiggin@suse.de
Al Viro
parent
3889e6e76f
commit
737f2e93b9
3 changed files with 118 additions and 35 deletions
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@ -122,7 +122,6 @@ extern int ext2_write_inode (struct inode *, struct writeback_control *);
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extern void ext2_delete_inode (struct inode *);
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extern int ext2_sync_inode (struct inode *);
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extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
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extern void ext2_truncate (struct inode *);
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extern int ext2_setattr (struct dentry *, struct iattr *);
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extern void ext2_set_inode_flags(struct inode *inode);
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extern void ext2_get_inode_flags(struct ext2_inode_info *);
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@ -95,7 +95,6 @@ const struct file_operations ext2_xip_file_operations = {
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#endif
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const struct inode_operations ext2_file_inode_operations = {
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.truncate = ext2_truncate,
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#ifdef CONFIG_EXT2_FS_XATTR
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.setxattr = generic_setxattr,
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.getxattr = generic_getxattr,
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153
fs/ext2/inode.c
153
fs/ext2/inode.c
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@ -54,6 +54,18 @@ static inline int ext2_inode_is_fast_symlink(struct inode *inode)
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inode->i_blocks - ea_blocks == 0);
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}
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static void ext2_truncate_blocks(struct inode *inode, loff_t offset);
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static void ext2_write_failed(struct address_space *mapping, loff_t to)
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{
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struct inode *inode = mapping->host;
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if (to > inode->i_size) {
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truncate_pagecache(inode, to, inode->i_size);
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ext2_truncate_blocks(inode, inode->i_size);
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}
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}
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/*
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* Called at the last iput() if i_nlink is zero.
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*/
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@ -71,7 +83,7 @@ void ext2_delete_inode (struct inode * inode)
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inode->i_size = 0;
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if (inode->i_blocks)
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ext2_truncate (inode);
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ext2_truncate_blocks(inode, 0);
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ext2_free_inode (inode);
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return;
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@ -757,8 +769,8 @@ int __ext2_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
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{
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return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
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ext2_get_block);
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return block_write_begin_newtrunc(file, mapping, pos, len, flags,
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pagep, fsdata, ext2_get_block);
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}
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static int
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@ -766,8 +778,25 @@ ext2_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
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{
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int ret;
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*pagep = NULL;
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return __ext2_write_begin(file, mapping, pos, len, flags, pagep,fsdata);
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ret = __ext2_write_begin(file, mapping, pos, len, flags, pagep, fsdata);
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if (ret < 0)
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ext2_write_failed(mapping, pos + len);
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return ret;
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}
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static int ext2_write_end(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata)
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{
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int ret;
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ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
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if (ret < len)
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ext2_write_failed(mapping, pos + len);
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return ret;
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}
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static int
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@ -775,13 +804,18 @@ ext2_nobh_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
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{
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int ret;
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/*
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* Dir-in-pagecache still uses ext2_write_begin. Would have to rework
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* directory handling code to pass around offsets rather than struct
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* pages in order to make this work easily.
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*/
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return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
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ext2_get_block);
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ret = nobh_write_begin_newtrunc(file, mapping, pos, len, flags, pagep,
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fsdata, ext2_get_block);
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if (ret < 0)
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ext2_write_failed(mapping, pos + len);
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return ret;
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}
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static int ext2_nobh_writepage(struct page *page,
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@ -800,10 +834,15 @@ ext2_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
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loff_t offset, unsigned long nr_segs)
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{
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struct file *file = iocb->ki_filp;
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struct inode *inode = file->f_mapping->host;
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struct address_space *mapping = file->f_mapping;
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struct inode *inode = mapping->host;
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ssize_t ret;
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return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
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offset, nr_segs, ext2_get_block, NULL);
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ret = blockdev_direct_IO_newtrunc(rw, iocb, inode, inode->i_sb->s_bdev,
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iov, offset, nr_segs, ext2_get_block, NULL);
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if (ret < 0 && (rw & WRITE))
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ext2_write_failed(mapping, offset + iov_length(iov, nr_segs));
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return ret;
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}
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static int
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@ -818,7 +857,7 @@ const struct address_space_operations ext2_aops = {
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.writepage = ext2_writepage,
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.sync_page = block_sync_page,
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.write_begin = ext2_write_begin,
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.write_end = generic_write_end,
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.write_end = ext2_write_end,
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.bmap = ext2_bmap,
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.direct_IO = ext2_direct_IO,
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.writepages = ext2_writepages,
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@ -1027,7 +1066,7 @@ static void ext2_free_branches(struct inode *inode, __le32 *p, __le32 *q, int de
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ext2_free_data(inode, p, q);
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}
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void ext2_truncate(struct inode *inode)
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static void __ext2_truncate_blocks(struct inode *inode, loff_t offset)
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{
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__le32 *i_data = EXT2_I(inode)->i_data;
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struct ext2_inode_info *ei = EXT2_I(inode);
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@ -1039,27 +1078,8 @@ void ext2_truncate(struct inode *inode)
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int n;
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long iblock;
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unsigned blocksize;
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if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
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S_ISLNK(inode->i_mode)))
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return;
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if (ext2_inode_is_fast_symlink(inode))
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return;
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if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
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return;
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blocksize = inode->i_sb->s_blocksize;
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iblock = (inode->i_size + blocksize-1)
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>> EXT2_BLOCK_SIZE_BITS(inode->i_sb);
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if (mapping_is_xip(inode->i_mapping))
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xip_truncate_page(inode->i_mapping, inode->i_size);
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else if (test_opt(inode->i_sb, NOBH))
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nobh_truncate_page(inode->i_mapping,
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inode->i_size, ext2_get_block);
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else
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block_truncate_page(inode->i_mapping,
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inode->i_size, ext2_get_block);
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iblock = (offset + blocksize-1) >> EXT2_BLOCK_SIZE_BITS(inode->i_sb);
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n = ext2_block_to_path(inode, iblock, offsets, NULL);
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if (n == 0)
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@ -1127,6 +1147,62 @@ void ext2_truncate(struct inode *inode)
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ext2_discard_reservation(inode);
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mutex_unlock(&ei->truncate_mutex);
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}
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static void ext2_truncate_blocks(struct inode *inode, loff_t offset)
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{
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/*
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* XXX: it seems like a bug here that we don't allow
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* IS_APPEND inode to have blocks-past-i_size trimmed off.
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* review and fix this.
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*
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* Also would be nice to be able to handle IO errors and such,
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* but that's probably too much to ask.
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*/
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if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
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S_ISLNK(inode->i_mode)))
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return;
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if (ext2_inode_is_fast_symlink(inode))
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return;
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if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
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return;
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__ext2_truncate_blocks(inode, offset);
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}
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int ext2_setsize(struct inode *inode, loff_t newsize)
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{
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loff_t oldsize;
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int error;
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error = inode_newsize_ok(inode, newsize);
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if (error)
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return error;
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if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
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S_ISLNK(inode->i_mode)))
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return -EINVAL;
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if (ext2_inode_is_fast_symlink(inode))
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return -EINVAL;
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if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
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return -EPERM;
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if (mapping_is_xip(inode->i_mapping))
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error = xip_truncate_page(inode->i_mapping, newsize);
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else if (test_opt(inode->i_sb, NOBH))
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error = nobh_truncate_page(inode->i_mapping,
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newsize, ext2_get_block);
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else
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error = block_truncate_page(inode->i_mapping,
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newsize, ext2_get_block);
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if (error)
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return error;
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oldsize = inode->i_size;
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i_size_write(inode, newsize);
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truncate_pagecache(inode, oldsize, newsize);
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__ext2_truncate_blocks(inode, newsize);
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inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
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if (inode_needs_sync(inode)) {
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sync_mapping_buffers(inode->i_mapping);
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@ -1134,6 +1210,8 @@ void ext2_truncate(struct inode *inode)
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} else {
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mark_inode_dirty(inode);
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}
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return 0;
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}
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static struct ext2_inode *ext2_get_inode(struct super_block *sb, ino_t ino,
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@ -1474,8 +1552,15 @@ int ext2_setattr(struct dentry *dentry, struct iattr *iattr)
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if (error)
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return error;
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}
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error = inode_setattr(inode, iattr);
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if (!error && (iattr->ia_valid & ATTR_MODE))
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error = ext2_acl_chmod(inode);
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if (iattr->ia_valid & ATTR_SIZE) {
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error = ext2_setsize(inode, iattr->ia_size);
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if (error)
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return error;
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}
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generic_setattr(inode, iattr);
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if (iattr->ia_valid & ATTR_MODE)
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error = ext2_acl_chmod(inode);
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mark_inode_dirty(inode);
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return error;
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}
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