From: "Amit K. Arora" Subject: [PATCH 1/5] fallocate() implementation in i86, x86_64 and powerpc Cc: linux-ext4@vger.kernel.org, xfs@oss.sgi.com, suparna@in.ibm.com, cmm@us.ibm.com This patch implements the fallocate() system call and adds support for i386, x86_64 and powerpc. NOTE: It is based on 2.6.21 kernel version. Signed-off-by: Amit Arora --- arch/i386/kernel/syscall_table.S | 1 arch/powerpc/kernel/sys_ppc32.c | 7 ++++++ arch/x86_64/kernel/functionlist | 1 fs/open.c | 41 +++++++++++++++++++++++++++++++++++++++ include/asm-i386/unistd.h | 3 +- include/asm-powerpc/systbl.h | 1 include/asm-powerpc/unistd.h | 3 +- include/asm-x86_64/unistd.h | 4 ++- include/linux/fs.h | 7 ++++++ include/linux/syscalls.h | 1 10 files changed, 66 insertions(+), 3 deletions(-) Index: linux-2.6.21/arch/i386/kernel/syscall_table.S =================================================================== --- linux-2.6.21.orig/arch/i386/kernel/syscall_table.S +++ linux-2.6.21/arch/i386/kernel/syscall_table.S @@ -319,3 +319,4 @@ ENTRY(sys_call_table) .long sys_move_pages .long sys_getcpu .long sys_epoll_pwait + .long sys_fallocate /* 320 */ Index: linux-2.6.21/arch/x86_64/kernel/functionlist =================================================================== --- linux-2.6.21.orig/arch/x86_64/kernel/functionlist +++ linux-2.6.21/arch/x86_64/kernel/functionlist @@ -931,6 +931,7 @@ *(.text.sys_getitimer) *(.text.sys_getgroups) *(.text.sys_ftruncate) +*(.text.sys_fallocate) *(.text.sysfs_lookup) *(.text.sys_exit_group) *(.text.stub_fork) Index: linux-2.6.21/fs/open.c =================================================================== --- linux-2.6.21.orig/fs/open.c +++ linux-2.6.21/fs/open.c @@ -350,6 +350,47 @@ asmlinkage long sys_ftruncate64(unsigned } #endif +asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len) +{ + struct file *file; + struct inode *inode; + long ret = -EINVAL; + + if (len == 0 || offset < 0) + goto out; + + ret = -EBADF; + file = fget(fd); + if (!file) + goto out; + if (!(file->f_mode & FMODE_WRITE)) + goto out_fput; + + inode = file->f_path.dentry->d_inode; + + ret = -ESPIPE; + if (S_ISFIFO(inode->i_mode)) + goto out_fput; + + ret = -ENODEV; + if (!S_ISREG(inode->i_mode)) + goto out_fput; + + ret = -EFBIG; + if (offset + len > inode->i_sb->s_maxbytes) + goto out_fput; + + if (inode->i_op && inode->i_op->fallocate) + ret = inode->i_op->fallocate(inode, mode, offset, len); + else + ret = -ENOSYS; +out_fput: + fput(file); +out: + return ret; +} +EXPORT_SYMBOL(sys_fallocate); + /* * access() needs to use the real uid/gid, not the effective uid/gid. * We do this by temporarily clearing all FS-related capabilities and Index: linux-2.6.21/include/asm-i386/unistd.h =================================================================== --- linux-2.6.21.orig/include/asm-i386/unistd.h +++ linux-2.6.21/include/asm-i386/unistd.h @@ -325,10 +325,11 @@ #define __NR_move_pages 317 #define __NR_getcpu 318 #define __NR_epoll_pwait 319 +#define __NR_fallocate 320 #ifdef __KERNEL__ -#define NR_syscalls 320 +#define NR_syscalls 321 #define __ARCH_WANT_IPC_PARSE_VERSION #define __ARCH_WANT_OLD_READDIR Index: linux-2.6.21/include/asm-powerpc/systbl.h =================================================================== --- linux-2.6.21.orig/include/asm-powerpc/systbl.h +++ linux-2.6.21/include/asm-powerpc/systbl.h @@ -307,3 +307,4 @@ COMPAT_SYS_SPU(set_robust_list) COMPAT_SYS_SPU(move_pages) SYSCALL_SPU(getcpu) COMPAT_SYS(epoll_pwait) +COMPAT_SYS(fallocate) Index: linux-2.6.21/include/asm-powerpc/unistd.h =================================================================== --- linux-2.6.21.orig/include/asm-powerpc/unistd.h +++ linux-2.6.21/include/asm-powerpc/unistd.h @@ -326,10 +326,11 @@ #define __NR_move_pages 301 #define __NR_getcpu 302 #define __NR_epoll_pwait 303 +#define __NR_fallocate 304 #ifdef __KERNEL__ -#define __NR_syscalls 304 +#define __NR_syscalls 305 #define __NR__exit __NR_exit #define NR_syscalls __NR_syscalls Index: linux-2.6.21/include/asm-x86_64/unistd.h =================================================================== --- linux-2.6.21.orig/include/asm-x86_64/unistd.h +++ linux-2.6.21/include/asm-x86_64/unistd.h @@ -619,8 +619,10 @@ __SYSCALL(__NR_sync_file_range, sys_sync __SYSCALL(__NR_vmsplice, sys_vmsplice) #define __NR_move_pages 279 __SYSCALL(__NR_move_pages, sys_move_pages) +#define __NR_fallocate 280 +__SYSCALL(__NR_fallocate, sys_fallocate) -#define __NR_syscall_max __NR_move_pages +#define __NR_syscall_max __NR_fallocate #ifndef __NO_STUBS #define __ARCH_WANT_OLD_READDIR Index: linux-2.6.21/include/linux/fs.h =================================================================== --- linux-2.6.21.orig/include/linux/fs.h +++ linux-2.6.21/include/linux/fs.h @@ -264,6 +264,12 @@ extern int dir_notify_enable; #define SYNC_FILE_RANGE_WRITE 2 #define SYNC_FILE_RANGE_WAIT_AFTER 4 +/* + * fallocate() modes + */ +#define FA_ALLOCATE 0x1 +#define FA_DEALLOCATE 0x2 + #ifdef __KERNEL__ #include @@ -1125,6 +1131,7 @@ struct inode_operations { ssize_t (*listxattr) (struct dentry *, char *, size_t); int (*removexattr) (struct dentry *, const char *); void (*truncate_range)(struct inode *, loff_t, loff_t); + long (*fallocate)(struct inode *, int, loff_t, loff_t); }; struct seq_file; Index: linux-2.6.21/include/linux/syscalls.h =================================================================== --- linux-2.6.21.orig/include/linux/syscalls.h +++ linux-2.6.21/include/linux/syscalls.h @@ -602,6 +602,7 @@ asmlinkage long sys_get_robust_list(int asmlinkage long sys_set_robust_list(struct robust_list_head __user *head, size_t len); asmlinkage long sys_getcpu(unsigned __user *cpu, unsigned __user *node, struct getcpu_cache __user *cache); +asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len); int kernel_execve(const char *filename, char *const argv[], char *const envp[]); Index: linux-2.6.21/arch/powerpc/kernel/sys_ppc32.c =================================================================== --- linux-2.6.21.orig/arch/powerpc/kernel/sys_ppc32.c +++ linux-2.6.21/arch/powerpc/kernel/sys_ppc32.c @@ -777,6 +777,13 @@ asmlinkage int compat_sys_truncate64(con return sys_truncate(path, (high << 32) | low); } +asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo, + u32 lenhi, u32 lenlo) +{ + return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo, + ((loff_t)lenhi << 32) | lenlo); +} + asmlinkage int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long high, unsigned long low) { - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html