X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=fs%2Fgfs2%2Fops_file.c;h=e1b7d525a06613f83abb239478cd0d8b8e09bb18;hb=0fcfbb1d317593d3d713a850bfdb310cc1585ae2;hp=bb11fd6752d3d47e0f50eaeae330e2ecad391f1b;hpb=347c53dca73fca317d57781f510f5ff4f6c0d0d7;p=linux-2.6-omap-h63xx.git diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c index bb11fd6752d..e1b7d525a06 100644 --- a/fs/gfs2/ops_file.c +++ b/fs/gfs2/ops_file.c @@ -30,60 +30,15 @@ #include "glock.h" #include "glops.h" #include "inode.h" -#include "lm.h" #include "log.h" #include "meta_io.h" -#include "ops_file.h" -#include "ops_vm.h" #include "quota.h" #include "rgrp.h" #include "trans.h" #include "util.h" #include "eaops.h" - -/* - * Most fields left uninitialised to catch anybody who tries to - * use them. f_flags set to prevent file_accessed() from touching - * any other part of this. Its use is purely as a flag so that we - * know (in readpage()) whether or not do to locking. - */ -struct file gfs2_internal_file_sentinel = { - .f_flags = O_NOATIME|O_RDONLY, -}; - -static int gfs2_read_actor(read_descriptor_t *desc, struct page *page, - unsigned long offset, unsigned long size) -{ - char *kaddr; - unsigned long count = desc->count; - - if (size > count) - size = count; - - kaddr = kmap(page); - memcpy(desc->arg.data, kaddr + offset, size); - kunmap(page); - - desc->count = count - size; - desc->written += size; - desc->arg.buf += size; - return size; -} - -int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, - char *buf, loff_t *pos, unsigned size) -{ - struct inode *inode = &ip->i_inode; - read_descriptor_t desc; - desc.written = 0; - desc.arg.data = buf; - desc.count = size; - desc.error = 0; - do_generic_mapping_read(inode->i_mapping, ra_state, - &gfs2_internal_file_sentinel, pos, &desc, - gfs2_read_actor); - return desc.written ? desc.written : desc.error; -} +#include "ops_address.h" +#include "ops_inode.h" /** * gfs2_llseek - seek to a location in a file @@ -214,7 +169,7 @@ static int gfs2_get_flags(struct file *filp, u32 __user *ptr) if (put_user(fsflags, ptr)) error = -EFAULT; - gfs2_glock_dq_m(1, &gh); + gfs2_glock_dq(&gh); gfs2_holder_uninit(&gh); return error; } @@ -291,7 +246,16 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) if (error) goto out; } - + if ((flags ^ new_flags) & GFS2_DIF_JDATA) { + if (flags & GFS2_DIF_JDATA) + gfs2_log_flush(sdp, ip->i_gl); + error = filemap_fdatawrite(inode->i_mapping); + if (error) + goto out; + error = filemap_fdatawait(inode->i_mapping); + if (error) + goto out; + } error = gfs2_trans_begin(sdp, RES_DINODE, 0); if (error) goto out; @@ -303,6 +267,7 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) gfs2_dinode_out(ip, bh->b_data); brelse(bh); gfs2_set_inode_flags(inode); + gfs2_set_aops(inode); out_trans_end: gfs2_trans_end(sdp); out: @@ -338,6 +303,125 @@ static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) return -ENOTTY; } +/** + * gfs2_allocate_page_backing - Use bmap to allocate blocks + * @page: The (locked) page to allocate backing for + * + * We try to allocate all the blocks required for the page in + * one go. This might fail for various reasons, so we keep + * trying until all the blocks to back this page are allocated. + * If some of the blocks are already allocated, thats ok too. + */ + +static int gfs2_allocate_page_backing(struct page *page) +{ + struct inode *inode = page->mapping->host; + struct buffer_head bh; + unsigned long size = PAGE_CACHE_SIZE; + u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); + + do { + bh.b_state = 0; + bh.b_size = size; + gfs2_block_map(inode, lblock, &bh, 1); + if (!buffer_mapped(&bh)) + return -EIO; + size -= bh.b_size; + lblock += (bh.b_size >> inode->i_blkbits); + } while(size > 0); + return 0; +} + +/** + * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable + * @vma: The virtual memory area + * @page: The page which is about to become writable + * + * When the page becomes writable, we need to ensure that we have + * blocks allocated on disk to back that page. + */ + +static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page) +{ + struct inode *inode = vma->vm_file->f_path.dentry->d_inode; + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_sbd *sdp = GFS2_SB(inode); + unsigned long last_index; + u64 pos = page->index << (PAGE_CACHE_SIZE - inode->i_blkbits); + unsigned int data_blocks, ind_blocks, rblocks; + int alloc_required = 0; + struct gfs2_holder gh; + struct gfs2_alloc *al; + int ret; + + gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME, &gh); + ret = gfs2_glock_nq_atime(&gh); + if (ret) + goto out; + + set_bit(GIF_SW_PAGED, &ip->i_flags); + gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); + ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required); + if (ret || !alloc_required) + goto out_unlock; + ret = -ENOMEM; + al = gfs2_alloc_get(ip); + if (al == NULL) + goto out_unlock; + + ret = gfs2_quota_lock_check(ip); + if (ret) + goto out_alloc_put; + al->al_requested = data_blocks + ind_blocks; + ret = gfs2_inplace_reserve(ip); + if (ret) + goto out_quota_unlock; + + rblocks = RES_DINODE + ind_blocks; + if (gfs2_is_jdata(ip)) + rblocks += data_blocks ? data_blocks : 1; + if (ind_blocks || data_blocks) + rblocks += RES_STATFS + RES_QUOTA; + ret = gfs2_trans_begin(sdp, rblocks, 0); + if (ret) + goto out_trans_fail; + + lock_page(page); + ret = -EINVAL; + last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT; + if (page->index > last_index) + goto out_unlock_page; + ret = 0; + if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping) + goto out_unlock_page; + if (gfs2_is_stuffed(ip)) { + ret = gfs2_unstuff_dinode(ip, page); + if (ret) + goto out_unlock_page; + } + ret = gfs2_allocate_page_backing(page); + +out_unlock_page: + unlock_page(page); + gfs2_trans_end(sdp); +out_trans_fail: + gfs2_inplace_release(ip); +out_quota_unlock: + gfs2_quota_unlock(ip); +out_alloc_put: + gfs2_alloc_put(ip); +out_unlock: + gfs2_glock_dq(&gh); +out: + gfs2_holder_uninit(&gh); + return ret; +} + +static struct vm_operations_struct gfs2_vm_ops = { + .fault = filemap_fault, + .page_mkwrite = gfs2_page_mkwrite, +}; + /** * gfs2_mmap - @@ -360,14 +444,7 @@ static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) return error; } - /* This is VM_MAYWRITE instead of VM_WRITE because a call - to mprotect() can turn on VM_WRITE later. */ - - if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) == - (VM_MAYSHARE | VM_MAYWRITE)) - vma->vm_ops = &gfs2_vm_ops_sharewrite; - else - vma->vm_ops = &gfs2_vm_ops_private; + vma->vm_ops = &gfs2_vm_ops; gfs2_glock_dq_uninit(&i_gh); @@ -516,6 +593,36 @@ static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) return generic_setlease(file, arg, fl); } +static int gfs2_lm_plock_get(struct gfs2_sbd *sdp, struct lm_lockname *name, + struct file *file, struct file_lock *fl) +{ + int error = -EIO; + if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) + error = sdp->sd_lockstruct.ls_ops->lm_plock_get( + sdp->sd_lockstruct.ls_lockspace, name, file, fl); + return error; +} + +static int gfs2_lm_plock(struct gfs2_sbd *sdp, struct lm_lockname *name, + struct file *file, int cmd, struct file_lock *fl) +{ + int error = -EIO; + if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) + error = sdp->sd_lockstruct.ls_ops->lm_plock( + sdp->sd_lockstruct.ls_lockspace, name, file, cmd, fl); + return error; +} + +static int gfs2_lm_punlock(struct gfs2_sbd *sdp, struct lm_lockname *name, + struct file *file, struct file_lock *fl) +{ + int error = -EIO; + if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) + error = sdp->sd_lockstruct.ls_ops->lm_punlock( + sdp->sd_lockstruct.ls_lockspace, name, file, fl); + return error; +} + /** * gfs2_lock - acquire/release a posix lock on a file * @file: the file pointer @@ -538,15 +645,6 @@ static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) if (__mandatory_lock(&ip->i_inode)) return -ENOLCK; - if (sdp->sd_args.ar_localflocks) { - if (IS_GETLK(cmd)) { - posix_test_lock(file, fl); - return 0; - } else { - return posix_lock_file_wait(file, fl); - } - } - if (cmd == F_CANCELLK) { /* Hack: */ cmd = F_SETLK; @@ -632,16 +730,12 @@ static void do_unflock(struct file *file, struct file_lock *fl) static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) { struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); - struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); if (!(fl->fl_flags & FL_FLOCK)) return -ENOLCK; if (__mandatory_lock(&ip->i_inode)) return -ENOLCK; - if (sdp->sd_args.ar_localflocks) - return flock_lock_file_wait(file, fl); - if (fl->fl_type == F_UNLCK) { do_unflock(file, fl); return 0; @@ -678,3 +772,27 @@ const struct file_operations gfs2_dir_fops = { .flock = gfs2_flock, }; +const struct file_operations gfs2_file_fops_nolock = { + .llseek = gfs2_llseek, + .read = do_sync_read, + .aio_read = generic_file_aio_read, + .write = do_sync_write, + .aio_write = generic_file_aio_write, + .unlocked_ioctl = gfs2_ioctl, + .mmap = gfs2_mmap, + .open = gfs2_open, + .release = gfs2_close, + .fsync = gfs2_fsync, + .splice_read = generic_file_splice_read, + .splice_write = generic_file_splice_write, + .setlease = gfs2_setlease, +}; + +const struct file_operations gfs2_dir_fops_nolock = { + .readdir = gfs2_readdir, + .unlocked_ioctl = gfs2_ioctl, + .open = gfs2_open, + .release = gfs2_close, + .fsync = gfs2_fsync, +}; +