diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/nfs/file.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/nfs/file.c | 900 |
1 files changed, 900 insertions, 0 deletions
diff --git a/ANDROID_3.4.5/fs/nfs/file.c b/ANDROID_3.4.5/fs/nfs/file.c new file mode 100644 index 00000000..aa9b709f --- /dev/null +++ b/ANDROID_3.4.5/fs/nfs/file.c @@ -0,0 +1,900 @@ +/* + * linux/fs/nfs/file.c + * + * Copyright (C) 1992 Rick Sladkey + * + * Changes Copyright (C) 1994 by Florian La Roche + * - Do not copy data too often around in the kernel. + * - In nfs_file_read the return value of kmalloc wasn't checked. + * - Put in a better version of read look-ahead buffering. Original idea + * and implementation by Wai S Kok elekokws@ee.nus.sg. + * + * Expire cache on write to a file by Wai S Kok (Oct 1994). + * + * Total rewrite of read side for new NFS buffer cache.. Linus. + * + * nfs regular file handling functions + */ + +#include <linux/time.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/fcntl.h> +#include <linux/stat.h> +#include <linux/nfs_fs.h> +#include <linux/nfs_mount.h> +#include <linux/mm.h> +#include <linux/pagemap.h> +#include <linux/aio.h> +#include <linux/gfp.h> +#include <linux/swap.h> + +#include <asm/uaccess.h> + +#include "delegation.h" +#include "internal.h" +#include "iostat.h" +#include "fscache.h" +#include "pnfs.h" + +#define NFSDBG_FACILITY NFSDBG_FILE + +static const struct vm_operations_struct nfs_file_vm_ops; + +const struct inode_operations nfs_file_inode_operations = { + .permission = nfs_permission, + .getattr = nfs_getattr, + .setattr = nfs_setattr, +}; + +#ifdef CONFIG_NFS_V3 +const struct inode_operations nfs3_file_inode_operations = { + .permission = nfs_permission, + .getattr = nfs_getattr, + .setattr = nfs_setattr, + .listxattr = nfs3_listxattr, + .getxattr = nfs3_getxattr, + .setxattr = nfs3_setxattr, + .removexattr = nfs3_removexattr, +}; +#endif /* CONFIG_NFS_v3 */ + +/* Hack for future NFS swap support */ +#ifndef IS_SWAPFILE +# define IS_SWAPFILE(inode) (0) +#endif + +static int nfs_check_flags(int flags) +{ + if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) + return -EINVAL; + + return 0; +} + +/* + * Open file + */ +static int +nfs_file_open(struct inode *inode, struct file *filp) +{ + int res; + + dprintk("NFS: open file(%s/%s)\n", + filp->f_path.dentry->d_parent->d_name.name, + filp->f_path.dentry->d_name.name); + + nfs_inc_stats(inode, NFSIOS_VFSOPEN); + res = nfs_check_flags(filp->f_flags); + if (res) + return res; + + res = nfs_open(inode, filp); + return res; +} + +static int +nfs_file_release(struct inode *inode, struct file *filp) +{ + dprintk("NFS: release(%s/%s)\n", + filp->f_path.dentry->d_parent->d_name.name, + filp->f_path.dentry->d_name.name); + + nfs_inc_stats(inode, NFSIOS_VFSRELEASE); + return nfs_release(inode, filp); +} + +/** + * nfs_revalidate_size - Revalidate the file size + * @inode - pointer to inode struct + * @file - pointer to struct file + * + * Revalidates the file length. This is basically a wrapper around + * nfs_revalidate_inode() that takes into account the fact that we may + * have cached writes (in which case we don't care about the server's + * idea of what the file length is), or O_DIRECT (in which case we + * shouldn't trust the cache). + */ +static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) +{ + struct nfs_server *server = NFS_SERVER(inode); + struct nfs_inode *nfsi = NFS_I(inode); + + if (nfs_have_delegated_attributes(inode)) + goto out_noreval; + + if (filp->f_flags & O_DIRECT) + goto force_reval; + if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) + goto force_reval; + if (nfs_attribute_timeout(inode)) + goto force_reval; +out_noreval: + return 0; +force_reval: + return __nfs_revalidate_inode(server, inode); +} + +static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) +{ + dprintk("NFS: llseek file(%s/%s, %lld, %d)\n", + filp->f_path.dentry->d_parent->d_name.name, + filp->f_path.dentry->d_name.name, + offset, origin); + + /* + * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate + * the cached file length + */ + if (origin != SEEK_SET && origin != SEEK_CUR) { + struct inode *inode = filp->f_mapping->host; + + int retval = nfs_revalidate_file_size(inode, filp); + if (retval < 0) + return (loff_t)retval; + } + + return generic_file_llseek(filp, offset, origin); +} + +/* + * Flush all dirty pages, and check for write errors. + */ +static int +nfs_file_flush(struct file *file, fl_owner_t id) +{ + struct dentry *dentry = file->f_path.dentry; + struct inode *inode = dentry->d_inode; + + dprintk("NFS: flush(%s/%s)\n", + dentry->d_parent->d_name.name, + dentry->d_name.name); + + nfs_inc_stats(inode, NFSIOS_VFSFLUSH); + if ((file->f_mode & FMODE_WRITE) == 0) + return 0; + + /* Flush writes to the server and return any errors */ + return vfs_fsync(file, 0); +} + +static ssize_t +nfs_file_read(struct kiocb *iocb, const struct iovec *iov, + unsigned long nr_segs, loff_t pos) +{ + struct dentry * dentry = iocb->ki_filp->f_path.dentry; + struct inode * inode = dentry->d_inode; + ssize_t result; + + if (iocb->ki_filp->f_flags & O_DIRECT) + return nfs_file_direct_read(iocb, iov, nr_segs, pos); + + dprintk("NFS: read(%s/%s, %lu@%lu)\n", + dentry->d_parent->d_name.name, dentry->d_name.name, + (unsigned long) iov_length(iov, nr_segs), (unsigned long) pos); + + result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); + if (!result) { + result = generic_file_aio_read(iocb, iov, nr_segs, pos); + if (result > 0) + nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result); + } + return result; +} + +static ssize_t +nfs_file_splice_read(struct file *filp, loff_t *ppos, + struct pipe_inode_info *pipe, size_t count, + unsigned int flags) +{ + struct dentry *dentry = filp->f_path.dentry; + struct inode *inode = dentry->d_inode; + ssize_t res; + + dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n", + dentry->d_parent->d_name.name, dentry->d_name.name, + (unsigned long) count, (unsigned long long) *ppos); + + res = nfs_revalidate_mapping(inode, filp->f_mapping); + if (!res) { + res = generic_file_splice_read(filp, ppos, pipe, count, flags); + if (res > 0) + nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res); + } + return res; +} + +static int +nfs_file_mmap(struct file * file, struct vm_area_struct * vma) +{ + struct dentry *dentry = file->f_path.dentry; + struct inode *inode = dentry->d_inode; + int status; + + dprintk("NFS: mmap(%s/%s)\n", + dentry->d_parent->d_name.name, dentry->d_name.name); + + /* Note: generic_file_mmap() returns ENOSYS on nommu systems + * so we call that before revalidating the mapping + */ + status = generic_file_mmap(file, vma); + if (!status) { + vma->vm_ops = &nfs_file_vm_ops; + status = nfs_revalidate_mapping(inode, file->f_mapping); + } + return status; +} + +/* + * Flush any dirty pages for this process, and check for write errors. + * The return status from this call provides a reliable indication of + * whether any write errors occurred for this process. + * + * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to + * disk, but it retrieves and clears ctx->error after synching, despite + * the two being set at the same time in nfs_context_set_write_error(). + * This is because the former is used to notify the _next_ call to + * nfs_file_write() that a write error occurred, and hence cause it to + * fall back to doing a synchronous write. + */ +static int +nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) +{ + struct dentry *dentry = file->f_path.dentry; + struct nfs_open_context *ctx = nfs_file_open_context(file); + struct inode *inode = dentry->d_inode; + int have_error, status; + int ret = 0; + + dprintk("NFS: fsync file(%s/%s) datasync %d\n", + dentry->d_parent->d_name.name, dentry->d_name.name, + datasync); + + ret = filemap_write_and_wait_range(inode->i_mapping, start, end); + mutex_lock(&inode->i_mutex); + + nfs_inc_stats(inode, NFSIOS_VFSFSYNC); + have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); + status = nfs_commit_inode(inode, FLUSH_SYNC); + if (status >= 0 && ret < 0) + status = ret; + have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); + if (have_error) + ret = xchg(&ctx->error, 0); + if (!ret && status < 0) + ret = status; + if (!ret && !datasync) + /* application has asked for meta-data sync */ + ret = pnfs_layoutcommit_inode(inode, true); + mutex_unlock(&inode->i_mutex); + return ret; +} + +/* + * Decide whether a read/modify/write cycle may be more efficient + * then a modify/write/read cycle when writing to a page in the + * page cache. + * + * The modify/write/read cycle may occur if a page is read before + * being completely filled by the writer. In this situation, the + * page must be completely written to stable storage on the server + * before it can be refilled by reading in the page from the server. + * This can lead to expensive, small, FILE_SYNC mode writes being + * done. + * + * It may be more efficient to read the page first if the file is + * open for reading in addition to writing, the page is not marked + * as Uptodate, it is not dirty or waiting to be committed, + * indicating that it was previously allocated and then modified, + * that there were valid bytes of data in that range of the file, + * and that the new data won't completely replace the old data in + * that range of the file. + */ +static int nfs_want_read_modify_write(struct file *file, struct page *page, + loff_t pos, unsigned len) +{ + unsigned int pglen = nfs_page_length(page); + unsigned int offset = pos & (PAGE_CACHE_SIZE - 1); + unsigned int end = offset + len; + + if ((file->f_mode & FMODE_READ) && /* open for read? */ + !PageUptodate(page) && /* Uptodate? */ + !PagePrivate(page) && /* i/o request already? */ + pglen && /* valid bytes of file? */ + (end < pglen || offset)) /* replace all valid bytes? */ + return 1; + return 0; +} + +/* + * This does the "real" work of the write. We must allocate and lock the + * page to be sent back to the generic routine, which then copies the + * data from user space. + * + * If the writer ends up delaying the write, the writer needs to + * increment the page use counts until he is done with the page. + */ +static int nfs_write_begin(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata) +{ + int ret; + pgoff_t index = pos >> PAGE_CACHE_SHIFT; + struct page *page; + int once_thru = 0; + + dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n", + file->f_path.dentry->d_parent->d_name.name, + file->f_path.dentry->d_name.name, + mapping->host->i_ino, len, (long long) pos); + +start: + /* + * Prevent starvation issues if someone is doing a consistency + * sync-to-disk + */ + ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING, + nfs_wait_bit_killable, TASK_KILLABLE); + if (ret) + return ret; + + page = grab_cache_page_write_begin(mapping, index, flags); + if (!page) + return -ENOMEM; + *pagep = page; + + ret = nfs_flush_incompatible(file, page); + if (ret) { + unlock_page(page); + page_cache_release(page); + } else if (!once_thru && + nfs_want_read_modify_write(file, page, pos, len)) { + once_thru = 1; + ret = nfs_readpage(file, page); + page_cache_release(page); + if (!ret) + goto start; + } + return ret; +} + +static int nfs_write_end(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata) +{ + unsigned offset = pos & (PAGE_CACHE_SIZE - 1); + int status; + + dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n", + file->f_path.dentry->d_parent->d_name.name, + file->f_path.dentry->d_name.name, + mapping->host->i_ino, len, (long long) pos); + + /* + * Zero any uninitialised parts of the page, and then mark the page + * as up to date if it turns out that we're extending the file. + */ + if (!PageUptodate(page)) { + unsigned pglen = nfs_page_length(page); + unsigned end = offset + len; + + if (pglen == 0) { + zero_user_segments(page, 0, offset, + end, PAGE_CACHE_SIZE); + SetPageUptodate(page); + } else if (end >= pglen) { + zero_user_segment(page, end, PAGE_CACHE_SIZE); + if (offset == 0) + SetPageUptodate(page); + } else + zero_user_segment(page, pglen, PAGE_CACHE_SIZE); + } + + status = nfs_updatepage(file, page, offset, copied); + + unlock_page(page); + page_cache_release(page); + + if (status < 0) + return status; + return copied; +} + +/* + * Partially or wholly invalidate a page + * - Release the private state associated with a page if undergoing complete + * page invalidation + * - Called if either PG_private or PG_fscache is set on the page + * - Caller holds page lock + */ +static void nfs_invalidate_page(struct page *page, unsigned long offset) +{ + dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset); + + if (offset != 0) + return; + /* Cancel any unstarted writes on this page */ + nfs_wb_page_cancel(page->mapping->host, page); + + nfs_fscache_invalidate_page(page, page->mapping->host); +} + +/* + * Attempt to release the private state associated with a page + * - Called if either PG_private or PG_fscache is set on the page + * - Caller holds page lock + * - Return true (may release page) or false (may not) + */ +static int nfs_release_page(struct page *page, gfp_t gfp) +{ + struct address_space *mapping = page->mapping; + + dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); + + /* Only do I/O if gfp is a superset of GFP_KERNEL */ + if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) { + int how = FLUSH_SYNC; + + /* Don't let kswapd deadlock waiting for OOM RPC calls */ + if (current_is_kswapd()) + how = 0; + nfs_commit_inode(mapping->host, how); + } + /* If PagePrivate() is set, then the page is not freeable */ + if (PagePrivate(page)) + return 0; + return nfs_fscache_release_page(page, gfp); +} + +/* + * Attempt to clear the private state associated with a page when an error + * occurs that requires the cached contents of an inode to be written back or + * destroyed + * - Called if either PG_private or fscache is set on the page + * - Caller holds page lock + * - Return 0 if successful, -error otherwise + */ +static int nfs_launder_page(struct page *page) +{ + struct inode *inode = page->mapping->host; + struct nfs_inode *nfsi = NFS_I(inode); + + dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n", + inode->i_ino, (long long)page_offset(page)); + + nfs_fscache_wait_on_page_write(nfsi, page); + return nfs_wb_page(inode, page); +} + +const struct address_space_operations nfs_file_aops = { + .readpage = nfs_readpage, + .readpages = nfs_readpages, + .set_page_dirty = __set_page_dirty_nobuffers, + .writepage = nfs_writepage, + .writepages = nfs_writepages, + .write_begin = nfs_write_begin, + .write_end = nfs_write_end, + .invalidatepage = nfs_invalidate_page, + .releasepage = nfs_release_page, + .direct_IO = nfs_direct_IO, + .migratepage = nfs_migrate_page, + .launder_page = nfs_launder_page, + .error_remove_page = generic_error_remove_page, +}; + +/* + * Notification that a PTE pointing to an NFS page is about to be made + * writable, implying that someone is about to modify the page through a + * shared-writable mapping + */ +static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) +{ + struct page *page = vmf->page; + struct file *filp = vma->vm_file; + struct dentry *dentry = filp->f_path.dentry; + unsigned pagelen; + int ret = VM_FAULT_NOPAGE; + struct address_space *mapping; + + dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n", + dentry->d_parent->d_name.name, dentry->d_name.name, + filp->f_mapping->host->i_ino, + (long long)page_offset(page)); + + /* make sure the cache has finished storing the page */ + nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page); + + lock_page(page); + mapping = page->mapping; + if (mapping != dentry->d_inode->i_mapping) + goto out_unlock; + + wait_on_page_writeback(page); + + pagelen = nfs_page_length(page); + if (pagelen == 0) + goto out_unlock; + + ret = VM_FAULT_LOCKED; + if (nfs_flush_incompatible(filp, page) == 0 && + nfs_updatepage(filp, page, 0, pagelen) == 0) + goto out; + + ret = VM_FAULT_SIGBUS; +out_unlock: + unlock_page(page); +out: + return ret; +} + +static const struct vm_operations_struct nfs_file_vm_ops = { + .fault = filemap_fault, + .page_mkwrite = nfs_vm_page_mkwrite, +}; + +static int nfs_need_sync_write(struct file *filp, struct inode *inode) +{ + struct nfs_open_context *ctx; + + if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC)) + return 1; + ctx = nfs_file_open_context(filp); + if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) + return 1; + return 0; +} + +static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, + unsigned long nr_segs, loff_t pos) +{ + struct dentry * dentry = iocb->ki_filp->f_path.dentry; + struct inode * inode = dentry->d_inode; + unsigned long written = 0; + ssize_t result; + size_t count = iov_length(iov, nr_segs); + + if (iocb->ki_filp->f_flags & O_DIRECT) + return nfs_file_direct_write(iocb, iov, nr_segs, pos); + + dprintk("NFS: write(%s/%s, %lu@%Ld)\n", + dentry->d_parent->d_name.name, dentry->d_name.name, + (unsigned long) count, (long long) pos); + + result = -EBUSY; + if (IS_SWAPFILE(inode)) + goto out_swapfile; + /* + * O_APPEND implies that we must revalidate the file length. + */ + if (iocb->ki_filp->f_flags & O_APPEND) { + result = nfs_revalidate_file_size(inode, iocb->ki_filp); + if (result) + goto out; + } + + result = count; + if (!count) + goto out; + + result = generic_file_aio_write(iocb, iov, nr_segs, pos); + if (result > 0) + written = result; + + /* Return error values for O_DSYNC and IS_SYNC() */ + if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { + int err = vfs_fsync(iocb->ki_filp, 0); + if (err < 0) + result = err; + } + if (result > 0) + nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written); +out: + return result; + +out_swapfile: + printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); + goto out; +} + +static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe, + struct file *filp, loff_t *ppos, + size_t count, unsigned int flags) +{ + struct dentry *dentry = filp->f_path.dentry; + struct inode *inode = dentry->d_inode; + unsigned long written = 0; + ssize_t ret; + + dprintk("NFS splice_write(%s/%s, %lu@%llu)\n", + dentry->d_parent->d_name.name, dentry->d_name.name, + (unsigned long) count, (unsigned long long) *ppos); + + /* + * The combination of splice and an O_APPEND destination is disallowed. + */ + + ret = generic_file_splice_write(pipe, filp, ppos, count, flags); + if (ret > 0) + written = ret; + + if (ret >= 0 && nfs_need_sync_write(filp, inode)) { + int err = vfs_fsync(filp, 0); + if (err < 0) + ret = err; + } + if (ret > 0) + nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written); + return ret; +} + +static int +do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) +{ + struct inode *inode = filp->f_mapping->host; + int status = 0; + unsigned int saved_type = fl->fl_type; + + /* Try local locking first */ + posix_test_lock(filp, fl); + if (fl->fl_type != F_UNLCK) { + /* found a conflict */ + goto out; + } + fl->fl_type = saved_type; + + if (nfs_have_delegation(inode, FMODE_READ)) + goto out_noconflict; + + if (is_local) + goto out_noconflict; + + status = NFS_PROTO(inode)->lock(filp, cmd, fl); +out: + return status; +out_noconflict: + fl->fl_type = F_UNLCK; + goto out; +} + +static int do_vfs_lock(struct file *file, struct file_lock *fl) +{ + int res = 0; + switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { + case FL_POSIX: + res = posix_lock_file_wait(file, fl); + break; + case FL_FLOCK: + res = flock_lock_file_wait(file, fl); + break; + default: + BUG(); + } + return res; +} + +static int +do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) +{ + struct inode *inode = filp->f_mapping->host; + int status; + + /* + * Flush all pending writes before doing anything + * with locks.. + */ + nfs_sync_mapping(filp->f_mapping); + + /* NOTE: special case + * If we're signalled while cleaning up locks on process exit, we + * still need to complete the unlock. + */ + /* + * Use local locking if mounted with "-onolock" or with appropriate + * "-olocal_lock=" + */ + if (!is_local) + status = NFS_PROTO(inode)->lock(filp, cmd, fl); + else + status = do_vfs_lock(filp, fl); + return status; +} + +static int +is_time_granular(struct timespec *ts) { + return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000)); +} + +static int +do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) +{ + struct inode *inode = filp->f_mapping->host; + int status; + + /* + * Flush all pending writes before doing anything + * with locks.. + */ + status = nfs_sync_mapping(filp->f_mapping); + if (status != 0) + goto out; + + /* + * Use local locking if mounted with "-onolock" or with appropriate + * "-olocal_lock=" + */ + if (!is_local) + status = NFS_PROTO(inode)->lock(filp, cmd, fl); + else + status = do_vfs_lock(filp, fl); + if (status < 0) + goto out; + + /* + * Revalidate the cache if the server has time stamps granular + * enough to detect subsecond changes. Otherwise, clear the + * cache to prevent missing any changes. + * + * This makes locking act as a cache coherency point. + */ + nfs_sync_mapping(filp->f_mapping); + if (!nfs_have_delegation(inode, FMODE_READ)) { + if (is_time_granular(&NFS_SERVER(inode)->time_delta)) + __nfs_revalidate_inode(NFS_SERVER(inode), inode); + else + nfs_zap_caches(inode); + } +out: + return status; +} + +/* + * Lock a (portion of) a file + */ +static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) +{ + struct inode *inode = filp->f_mapping->host; + int ret = -ENOLCK; + int is_local = 0; + + dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n", + filp->f_path.dentry->d_parent->d_name.name, + filp->f_path.dentry->d_name.name, + fl->fl_type, fl->fl_flags, + (long long)fl->fl_start, (long long)fl->fl_end); + + nfs_inc_stats(inode, NFSIOS_VFSLOCK); + + /* No mandatory locks over NFS */ + if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) + goto out_err; + + if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL) + is_local = 1; + + if (NFS_PROTO(inode)->lock_check_bounds != NULL) { + ret = NFS_PROTO(inode)->lock_check_bounds(fl); + if (ret < 0) + goto out_err; + } + + if (IS_GETLK(cmd)) + ret = do_getlk(filp, cmd, fl, is_local); + else if (fl->fl_type == F_UNLCK) + ret = do_unlk(filp, cmd, fl, is_local); + else + ret = do_setlk(filp, cmd, fl, is_local); +out_err: + return ret; +} + +/* + * Lock a (portion of) a file + */ +static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) +{ + struct inode *inode = filp->f_mapping->host; + int is_local = 0; + + dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n", + filp->f_path.dentry->d_parent->d_name.name, + filp->f_path.dentry->d_name.name, + fl->fl_type, fl->fl_flags); + + if (!(fl->fl_flags & FL_FLOCK)) + return -ENOLCK; + + if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK) + is_local = 1; + + /* We're simulating flock() locks using posix locks on the server */ + fl->fl_owner = (fl_owner_t)filp; + fl->fl_start = 0; + fl->fl_end = OFFSET_MAX; + + if (fl->fl_type == F_UNLCK) + return do_unlk(filp, cmd, fl, is_local); + return do_setlk(filp, cmd, fl, is_local); +} + +/* + * There is no protocol support for leases, so we have no way to implement + * them correctly in the face of opens by other clients. + */ +static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) +{ + dprintk("NFS: setlease(%s/%s, arg=%ld)\n", + file->f_path.dentry->d_parent->d_name.name, + file->f_path.dentry->d_name.name, arg); + return -EINVAL; +} + +const struct file_operations nfs_file_operations = { + .llseek = nfs_file_llseek, + .read = do_sync_read, + .write = do_sync_write, + .aio_read = nfs_file_read, + .aio_write = nfs_file_write, + .mmap = nfs_file_mmap, + .open = nfs_file_open, + .flush = nfs_file_flush, + .release = nfs_file_release, + .fsync = nfs_file_fsync, + .lock = nfs_lock, + .flock = nfs_flock, + .splice_read = nfs_file_splice_read, + .splice_write = nfs_file_splice_write, + .check_flags = nfs_check_flags, + .setlease = nfs_setlease, +}; + +#ifdef CONFIG_NFS_V4 +static int +nfs4_file_open(struct inode *inode, struct file *filp) +{ + /* + * NFSv4 opens are handled in d_lookup and d_revalidate. If we get to + * this point, then something is very wrong + */ + dprintk("NFS: %s called! inode=%p filp=%p\n", __func__, inode, filp); + return -ENOTDIR; +} + +const struct file_operations nfs4_file_operations = { + .llseek = nfs_file_llseek, + .read = do_sync_read, + .write = do_sync_write, + .aio_read = nfs_file_read, + .aio_write = nfs_file_write, + .mmap = nfs_file_mmap, + .open = nfs4_file_open, + .flush = nfs_file_flush, + .release = nfs_file_release, + .fsync = nfs_file_fsync, + .lock = nfs_lock, + .flock = nfs_flock, + .splice_read = nfs_file_splice_read, + .splice_write = nfs_file_splice_write, + .check_flags = nfs_check_flags, + .setlease = nfs_setlease, +}; +#endif /* CONFIG_NFS_V4 */ |