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| author | Sage Weil <sage@newdream.net> | 2010-04-16 09:53:43 -0700 |
|---|---|---|
| committer | Sage Weil <sage@newdream.net> | 2010-08-01 20:11:39 -0700 |
| commit | 8c6e9229fc1989cf263a6fcd4ff406d7f473f966 (patch) | |
| tree | 6402204aae50b0590df39289ed1e533472ee6ca1 | |
| parent | 84d9509234c46481aded977193fcf23f892d715f (diff) | |
| download | linux-stable-8c6e9229fc1989cf263a6fcd4ff406d7f473f966.tar.gz linux-stable-8c6e9229fc1989cf263a6fcd4ff406d7f473f966.tar.bz2 linux-stable-8c6e9229fc1989cf263a6fcd4ff406d7f473f966.zip | |
ceph: add LAZYIO ioctl to mark a file description for lazy consistency
Allow an application to mark a file descriptor for lazy file consistency
semantics, allowing buffered reads and writes when multiple clients are
accessing the same file.
Signed-off-by: Sage Weil <sage@newdream.net>
| -rw-r--r-- | fs/ceph/ioctl.c | 24 | ||||
| -rw-r--r-- | fs/ceph/ioctl.h | 2 |
2 files changed, 26 insertions, 0 deletions
diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c index d085f07756b4..76e307d2aba1 100644 --- a/fs/ceph/ioctl.c +++ b/fs/ceph/ioctl.c @@ -143,6 +143,27 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg) return 0; } +static long ceph_ioctl_lazyio(struct file *file) +{ + struct ceph_file_info *fi = file->private_data; + struct inode *inode = file->f_dentry->d_inode; + struct ceph_inode_info *ci = ceph_inode(inode); + + if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) { + spin_lock(&inode->i_lock); + ci->i_nr_by_mode[fi->fmode]--; + fi->fmode |= CEPH_FILE_MODE_LAZY; + ci->i_nr_by_mode[fi->fmode]++; + spin_unlock(&inode->i_lock); + dout("ioctl_layzio: file %p marked lazy\n", file); + + ceph_check_caps(ci, 0, NULL); + } else { + dout("ioctl_layzio: file %p already lazy\n", file); + } + return 0; +} + long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg); @@ -155,6 +176,9 @@ long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg) case CEPH_IOC_GET_DATALOC: return ceph_ioctl_get_dataloc(file, (void __user *)arg); + + case CEPH_IOC_LAZYIO: + return ceph_ioctl_lazyio(file); } return -ENOTTY; } diff --git a/fs/ceph/ioctl.h b/fs/ceph/ioctl.h index 25e4f1a9d059..88451a3b6857 100644 --- a/fs/ceph/ioctl.h +++ b/fs/ceph/ioctl.h @@ -37,4 +37,6 @@ struct ceph_ioctl_dataloc { #define CEPH_IOC_GET_DATALOC _IOWR(CEPH_IOCTL_MAGIC, 3, \ struct ceph_ioctl_dataloc) +#define CEPH_IOC_LAZYIO _IO(CEPH_IOCTL_MAGIC, 4) + #endif |