diff options
Diffstat (limited to 'fs/coda/file.c')
| -rw-r--r-- | fs/coda/file.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/fs/coda/file.c b/fs/coda/file.c index ad3cd2abeeb..c4e395781d4 100644 --- a/fs/coda/file.c +++ b/fs/coda/file.c @@ -16,6 +16,7 @@ #include <linux/cred.h> #include <linux/errno.h> #include <linux/smp_lock.h> +#include <linux/spinlock.h> #include <linux/string.h> #include <linux/slab.h> #include <asm/uaccess.h> @@ -109,19 +110,24 @@ coda_file_mmap(struct file *coda_file, struct vm_area_struct *vma) coda_inode = coda_file->f_path.dentry->d_inode; host_inode = host_file->f_path.dentry->d_inode; + + cii = ITOC(coda_inode); + spin_lock(&cii->c_lock); coda_file->f_mapping = host_file->f_mapping; if (coda_inode->i_mapping == &coda_inode->i_data) coda_inode->i_mapping = host_inode->i_mapping; /* only allow additional mmaps as long as userspace isn't changing * the container file on us! */ - else if (coda_inode->i_mapping != host_inode->i_mapping) + else if (coda_inode->i_mapping != host_inode->i_mapping) { + spin_unlock(&cii->c_lock); return -EBUSY; + } /* keep track of how often the coda_inode/host_file has been mmapped */ - cii = ITOC(coda_inode); cii->c_mapcount++; cfi->cfi_mapcount++; + spin_unlock(&cii->c_lock); return host_file->f_op->mmap(host_file, vma); } @@ -185,11 +191,13 @@ int coda_release(struct inode *coda_inode, struct file *coda_file) cii = ITOC(coda_inode); /* did we mmap this file? */ + spin_lock(&cii->c_lock); if (coda_inode->i_mapping == &host_inode->i_data) { cii->c_mapcount -= cfi->cfi_mapcount; if (!cii->c_mapcount) coda_inode->i_mapping = &coda_inode->i_data; } + spin_unlock(&cii->c_lock); fput(cfi->cfi_container); kfree(coda_file->private_data); |