forked from luck/tmp_suning_uos_patched
10e5dce07e
This patch fixes buggy behaviour of UFS in such kind of scenario: open(, O_TRUNC...) ftruncate(, 1024) ftruncate(, 0) Such a scenario causes ufs_panic and remount read-only. This happen because of according to specification UFS should always allocate block for last byte, and many parts of our implementation rely on this, but `ufs_truncate' doesn't care about this. To make possible return error code and to know about old size, this patch removes `truncate' from ufs inode_operations and uses `setattr' method to call ufs_truncate. Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
/*
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* linux/fs/ufs/file.c
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*
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* Copyright (C) 1998
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* Daniel Pirkl <daniel.pirkl@email.cz>
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* Charles University, Faculty of Mathematics and Physics
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*
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* from
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*
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* linux/fs/ext2/file.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/file.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* ext2 fs regular file handling primitives
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*/
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#include <linux/fs.h>
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#include <linux/ufs_fs.h>
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#include <linux/buffer_head.h> /* for sync_mapping_buffers() */
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static int ufs_sync_file(struct file *file, struct dentry *dentry, int datasync)
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{
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struct inode *inode = dentry->d_inode;
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int err;
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int ret;
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ret = sync_mapping_buffers(inode->i_mapping);
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if (!(inode->i_state & I_DIRTY))
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return ret;
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if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
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return ret;
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err = ufs_sync_inode(inode);
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if (ret == 0)
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ret = err;
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return ret;
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}
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/*
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* We have mostly NULL's here: the current defaults are ok for
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* the ufs filesystem.
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*/
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const struct file_operations ufs_file_operations = {
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.llseek = generic_file_llseek,
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.read = generic_file_read,
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.write = generic_file_write,
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.mmap = generic_file_mmap,
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.open = generic_file_open,
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.fsync = ufs_sync_file,
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.sendfile = generic_file_sendfile,
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};
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