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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [ext3/] [file.c] - Rev 1279
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/* * linux/fs/ext3/file.c * * Copyright (C) 1992, 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) * * from * * linux/fs/minix/file.c * * Copyright (C) 1991, 1992 Linus Torvalds * * ext3 fs regular file handling primitives * * 64-bit file support on 64-bit platforms by Jakub Jelinek * (jj@sunsite.ms.mff.cuni.cz) */ #include <linux/sched.h> #include <linux/fs.h> #include <linux/locks.h> #include <linux/jbd.h> #include <linux/ext3_fs.h> #include <linux/ext3_jbd.h> #include <linux/smp_lock.h> /* * Called when an inode is released. Note that this is different * from ext3_file_open: open gets called at every open, but release * gets called only when /all/ the files are closed. */ static int ext3_release_file (struct inode * inode, struct file * filp) { if (filp->f_mode & FMODE_WRITE) ext3_discard_prealloc (inode); return 0; } /* * Called when an inode is about to be opened. * We use this to disallow opening RW large files on 32bit systems if * the caller didn't specify O_LARGEFILE. On 64bit systems we force * on this flag in sys_open. */ static int ext3_open_file (struct inode * inode, struct file * filp) { if (!(filp->f_flags & O_LARGEFILE) && inode->i_size > 0x7FFFFFFFLL) return -EFBIG; return 0; } /* * ext3_file_write(). * * Most things are done in ext3_prepare_write() and ext3_commit_write(). */ static ssize_t ext3_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos) { ssize_t ret; int err; struct inode *inode = file->f_dentry->d_inode; ret = generic_file_write(file, buf, count, ppos); /* Skip file flushing code if there was an error, or if nothing was written. */ if (ret <= 0) return ret; /* If the inode is IS_SYNC, or is O_SYNC and we are doing data-journaling, then we need to make sure that we force the transaction to disk to keep all metadata uptodate synchronously. */ if (file->f_flags & O_SYNC) { /* If we are non-data-journaled, then the dirty data has already been flushed to backing store by generic_osync_inode, and the inode has been flushed too if there have been any modifications other than mere timestamp updates. Open question --- do we care about flushing timestamps too if the inode is IS_SYNC? */ if (!ext3_should_journal_data(inode)) return ret; goto force_commit; } /* So we know that there has been no forced data flush. If the inode is marked IS_SYNC, we need to force one ourselves. */ if (!IS_SYNC(inode)) return ret; /* Open question #2 --- should we force data to disk here too? If we don't, the only impact is that data=writeback filesystems won't flush data to disk automatically on IS_SYNC, only metadata (but historically, that is what ext2 has done.) */ force_commit: err = ext3_force_commit(inode->i_sb); if (err) return err; return ret; } struct file_operations ext3_file_operations = { llseek: generic_file_llseek, /* BKL held */ read: generic_file_read, /* BKL not held. Don't need */ write: ext3_file_write, /* BKL not held. Don't need */ ioctl: ext3_ioctl, /* BKL held */ mmap: generic_file_mmap, open: ext3_open_file, /* BKL not held. Don't need */ release: ext3_release_file, /* BKL not held. Don't need */ fsync: ext3_sync_file, /* BKL held */ }; struct inode_operations ext3_file_inode_operations = { truncate: ext3_truncate, /* BKL held */ setattr: ext3_setattr, /* BKL held */ };
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