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author | Jiufei Xue <jiufei.xue@linux.alibaba.com> | 2019-11-20 17:45:25 +0800 |
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committer | Miklos Szeredi <mszeredi@redhat.com> | 2020-01-24 09:46:46 +0100 |
commit | 5dcdc43e24a1810d3c3f4959af3d0c8e0026d863 (patch) | |
tree | 3bc92094e47dcdbc4cca8fd30465b4a191135d73 /fs/read_write.c | |
parent | 1346416564f06444ca59778c05607bedb91a991a (diff) | |
download | lwn-5dcdc43e24a1810d3c3f4959af3d0c8e0026d863.tar.gz lwn-5dcdc43e24a1810d3c3f4959af3d0c8e0026d863.zip |
vfs: add vfs_iocb_iter_[read|write] helper functions
This doesn't cause any behavior changes and will be used by overlay async
IO implementation.
Signed-off-by: Jiufei Xue <jiufei.xue@linux.alibaba.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/read_write.c')
-rw-r--r-- | fs/read_write.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 5bbf587f5bc1..bc75493e747b 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -939,6 +939,34 @@ out: return ret; } +ssize_t vfs_iocb_iter_read(struct file *file, struct kiocb *iocb, + struct iov_iter *iter) +{ + size_t tot_len; + ssize_t ret = 0; + + if (!file->f_op->read_iter) + return -EINVAL; + if (!(file->f_mode & FMODE_READ)) + return -EBADF; + if (!(file->f_mode & FMODE_CAN_READ)) + return -EINVAL; + + tot_len = iov_iter_count(iter); + if (!tot_len) + goto out; + ret = rw_verify_area(READ, file, &iocb->ki_pos, tot_len); + if (ret < 0) + return ret; + + ret = call_read_iter(file, iocb, iter); +out: + if (ret >= 0) + fsnotify_access(file); + return ret; +} +EXPORT_SYMBOL(vfs_iocb_iter_read); + ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos, rwf_t flags) { @@ -975,6 +1003,34 @@ static ssize_t do_iter_write(struct file *file, struct iov_iter *iter, return ret; } +ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb, + struct iov_iter *iter) +{ + size_t tot_len; + ssize_t ret = 0; + + if (!file->f_op->write_iter) + return -EINVAL; + if (!(file->f_mode & FMODE_WRITE)) + return -EBADF; + if (!(file->f_mode & FMODE_CAN_WRITE)) + return -EINVAL; + + tot_len = iov_iter_count(iter); + if (!tot_len) + return 0; + ret = rw_verify_area(WRITE, file, &iocb->ki_pos, tot_len); + if (ret < 0) + return ret; + + ret = call_write_iter(file, iocb, iter); + if (ret > 0) + fsnotify_modify(file); + + return ret; +} +EXPORT_SYMBOL(vfs_iocb_iter_write); + ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos, rwf_t flags) { |